Preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 110 g
b) 9030 cm
c) 6.0 cm
d)9.6 mm
e) 419.8 mL
f) 766.8 m
a) 100 g + 10 g = 110g
b) 903 cm × 10 cm = 9030 cm
c) 0.6030 cm² / 0.1 cm = 6.0 cm
here lowest significant is = 0.1 , so ans will round off till first decimal.
d) 9.5 mm + 0.083 mm = 9.583 mm = 9.6 mm
e) 430.0 mL -10.2111 mL = 419.8 mL
f) 762.4 m + 3.2 m + 1.21 m = 766.8 m
here the lowest significant figure = 3.2 , so the ans will be round off to first decimal figure.
Thus, preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 110 g
b) 9030 cm
c) 6.0 cm
d)9.6 mm
e) 419.8 mL
f) 766.8 m
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Due to the human extermination of prairie dogs in South Dakota, black footed ferrets became endangered in 1973. Only 18 ferrets were in existence in 1987. Rangers began a captive breeding program to increase their population numbers. The ferrets were later released in the Badlands and Wind Cave National Park in 2007.
Which type of conservation effort is this?
Responses
A. resource conservation
B. wildlife reintroduction
C.predator management
D.ecological introduction
The type of conservation effort which involves the captive breeding program to increase the population numbers of Ferrets is resource conservation and is denoted as option A.
What is Conservation?This is referred to as the process in which valuable resources which are present on earth such as plants, minerals etc are protected through various means by the appropriate authorities or individual.
Conservation helps to prevent dying out and extinction of species which is denoted in the captive breeding program to increase the population numbers of Ferrets so as to prevent the extinction of the animal hence option A was chosen.
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balance this equation
___ H2 + ___ O2 → ___ H2O2
Answer:
1H2+1O2—>H2O2
Explanation:
Use the integer+1
a sample of gas occupies a volume of 70.3 ml . as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr . what is the final volume of the gas?
A sample of gas occupies a volume of 70.3 ml as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr and the final volume of the gas is 11.12L
A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container and even in the presence of gravity and regardless of the amount of substance in the container
Here given data is 11.12L
V₁ = Initial volume = 70.3 ml = 0.0703ml = (1L=1000ml)
w = 140.6 J = 1.387 J = (1Latm=101.3J)
Pressure = 783 torr = 1.03 atm = (1atm=760 torr)
V₂ = final volume = ?
1.387Latm = 1.03 atm × (V₂ - 0.0703ml)
(V₂ - 0.0703ml) = 11.05
V₂ = 11.12L
The final volume of the gas is 11.12L
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can someone please help me with this problem !!!!!!???????
After connecting the battery to the wire, the student brings a few pieces of iron near the iron nail. The statement which best describes what will happen to the iron pieces is that: B. The Iron nail behaves like a magnet that attracts the pieces of iron.
What is the law of magnetism?The law of magnetism states that the unlike (different) poles of a magnet would attract each other while like poles of a magnet would generally repel one another.
This ultimately implies that, two north (N) or south (S) poles of a magnet would repel one another while a north (N) and south (S) of a magnet would attract each other.
Based on the law of magnetism, we can reasonably infer and logically deduce that if this student should bring a few pieces of iron near the iron nail after connecting the battery to the wire, the iron nail would behave like a magnet by attracting the pieces of iron because they are oppositely charged.
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Complete Question:
After connecting the battery to the wire, the student brings a few pieces of iron near the iron nail. Which statement describes what will happen to the iron pieces?
answer choices
The battery behaves like a magnet that repels the pieces of iron.
The Iron nail behaves like a magnet that attracts the pieces of iron.
The iron nail produces electric current that attracts the pieces of iron.
The coil rotates which produces electric current that repels the pieces of iron.
when GPR resin is setting, it gets hot
What type of reaction is this (exothermic or endothermic) and why?
What has happened in terms of energy transfer?
When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.
Endothermic reaction occurs when heat is absorbed by the system from surrounding. while Exothermic reaction occurs when heat is released by the system in surrounding. In endothermic reaction , the system absorbed the energy from its surrounding in the form of heat.
Thus, When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.
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When a magnesium atom becomes a cation, the size of the radius ...
a) decreases because it lost electrons
b) increases because it gained electrons
c) increases because it lost electrons
d) decreases because it gained electrons
When a magnesium atom becomes a cation, the size of the radius decreases because it lost electrons (Option A)
Description of magnisium ionMagnesium is a divalent metal. It loses its valence electrons to form a stable octet electronic configuration.
Generally, the ions (or cations) of metals tends to be smaller than their atoms because they lose electrons to form ions.
Now, we shall consider the atom and the ion of magnesium to see the difference. Please see attached photo
Magnesium lose electrons to form ion (cations) as follow:
Mg -> Mg²⁺ + 2e
From the equation and the diagram, we can see that the ion of magnesium is smaller than its atom.
This is so because the magnesium atom has two electrons more than the magnesium ion.
Thus, we can say that the correct option is: decreases because it lost electrons (Option A)
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please help with my chemistry homework thank you so much
Answer:
There are 2.2 moles of hydrogen.
Explanation:
The given information from the exercise is:
- Volume (V): 48.6L
- Temperature (T): 0°C (273K)
- Pressure (P): 1atm
1st) It is important to convert the temperature unit from °C to Kelvin:
[tex]0+273=273K[/tex]This first step is very important, because all the units must be at atm, L and Kelvin, before using the Ideal Gases Law formula.
2nd) Now to calculate the moles of hydrogen, we hae to replace the values of V, T and P in the Ideal Gases Law formula:
[tex]\begin{gathered} P*V=n*R*T \\ 1atm*48.6L=n*0.082\frac{atm*L}{mol*K}*273K \\ 48.6atm*L=n*22.4\frac{atm*L}{mol} \\ \frac{48.6atm}{22.4\frac{atm*L}{mol}}=n \\ 2.2moles=n \end{gathered}[/tex]R: is the gases constant, in its value is 0.082atm.L/mol.K.
So, there are 2.2 moles of hydrogen.
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of.
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of 12.
In the field of chemistry, atomic number can be described as the number of protons that is present in the nucleus of an atom.
The atomic number of Beryllium is 4 as it has 4 protons in its nucleus.
The second member of the group 2 elements in the periodic table is Magnesium. Magnesium has an atomic number of 12 because it has 12 protons in its nucleus.
The atomic number is represented by the letter Z usually. The atomic number is usually mentioned in a periodic table at the top-left.
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Draw the electron configuration for a neutral atom of chlorine.
The electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.
Atomic number of Chlorine is 17. to write the electronic configuration of chlorine we need to know the number of electrons in chlorine atom. the atomic number of chlorine is 17 therefore there are 17 electrons. the first two electron enter in 1s since s can hold only 2 electrons then next two electron will enter in 2s . the next six electrons will enter in 2p since p can hold six electrons . and next two electron in 3s now reaming 5 will enter in 3p. therefore the electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.
Thus, the electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵
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Can someone help me pls, i have like another 3 questions like this .-.
Answer:
1st box: Potential
2nd box: Electrical
3rd box: Kinetic
Explanation:
(1st box) Potential because the energy is stored and ready to act, which is definitely something desired for a battery.
(2nd box) Chemical, as discussed in the comments
(3rd box) Kinetic because the stored, potential energy is now 'acting' or 'in motion', causing it to be kinetic energy.
Answer:
Batteries store potential chemical energy
That the swith releases it into kinetic energy to light the room.
Explanation:
Energy comes in two main forms:
Kinetic energy which is energy of moving object or motion.2. Potential energy which is energy stored in object to be realesed to make effect. It can be stored in form of
Chemical energy. This can be in fuels or food taken by human body or the battery. Gravitational energy. This is due to the gravity and the force pulling the object from a height. Elastic energy. It is energy stored in rubber bands and spring balances.And there is much more....
Principle of conservation of energy says energy is not created nor destroyed but transferred from and object to another in different forms.
. Which of the following statements is not correct? A. Density has no units. B. Every measurement has a unit tied to it. C. Physical quantities are properties that can be measured. D. the Kelvin degree is larger than the Celsius degree.
Answer:
A because density DOES have a unit
Explanation:
thomas edison invented the light bulb only because he experimented with thousands of different kinds of materials for a filament before he found one that worked (carbon). this shows that at the most basic level, we can solve problems through
we can solve problems through trial and error
American businessman and inventor Thomas Alva Edison. He created several innovations in the production of electric power, mass communication, sound recording, and motion pictures. Thomas Alva Edison, one of history's most well-known and prolific innovators, made significant contributions to contemporary living by creating the phonograph, motion picture camera, incandescent light bulb, and telephone as well as enhancing the telegraph and telephony. The light bulb was created by Thomas Edison, who is best recognized for this invention. Edison, a brilliant inventor, made a thousand fruitless efforts to create the light bulb. How does it feel to fail 1,000 times, a reporter asked? I didn't fail 1,000 times, Edison said in response.
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Find the element that is oxidized and the one that is reduced KClO3 + 6 FeSO4 + 3 H2SO4 --> KCl + 3 Fe2(SO4)3 + 3 H2O
Answer: Fe is the element that is being oxidized (oxidation number changes from +2 to +3) while Cl is the element that is reduced (oxidation number changes from +5 to -1) in the given reaction.
Explanation:
The question requires us to find the element that is oxidized and the one reduced in the following chemical reaction:
[tex]KClO_3+6FeSO_4+3H_2SO_4\rightarrow KCl+3Fe_2(SO_4)_3+3H_2O[/tex]To solve this problem, we need to determine the oxidation number of all elements in the reactants and products sides, and then identify the elements that had their oxidation number increased (oxidized species) and decreased (reduced species).
To identify the oxidation numbers, we'll need to remember a few points:
- K is an alkali metal (part of group 1 in the periodic table), and it usually assumes the oxidation number +1;
- O usually presents oxidation number -2, except in a few specific cases;
- the anion (SO4) presents total charge -2 (in this anion, S presents oxidation number +6 and O, -2);
- H usually presents oxidation number +1.
Next, let's identify the oxidation number of all elements involved in the reaction, on both sides of the chemical equation. Since all compounds are neutral (i.e., they do not present charge), the sum of all oxidation numbers must be 0:
(note that the oxidation number of each element is indicated in red, above the respective element, while the contribution of this element to the molecule charge, considering the number of atoms, is represented in blue below the element).
In the image above, we can see that Cl has its oxidation number changing from +5 in KClO3 to -1 in KCl (highlighted in purple), while Fe has its oxidation number changing from +2 in FeSO4 to +3 in Fe2(SO4)3 (highlighted in green).
Therefore, we can say that Fe is the element that is being oxidized while Cl is the element that is reduced in the given reaction.
In photosynthesis, carbon dioxide and water are converted to glucose and oxygen. during cellular respiration glucose and oxygen are converted to carbon dioxide and water. identify the true statement about the processes of photosynthesis and cellular respiration. answer a cellular respiration only occurs in animal cells b photosynthesis only occurs in animal cells c both processes involve a chemical change d both processes involve a physical change
During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.
Why is it called cellular respiration?Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).
What is the purpose of cellular respiration?The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.
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Fatty acids that are broken down for energy production are utilized for which aspects of cellular respiration? choose all that apply.
Fatty acids that are broken down for energy productions are utilized for glycolysis.
What is glycolysis?Although the multiple choices are missing, you might be referring to these multiple choices: (a) Fermentation, (b) Glycolysis, (c) Pyruvate oxidation, (d) Citric acid cycle, (e) Electron transport chain. In that case, the correct answer is (b) Glycolysis.
Glycolysis refers to the breakdown of glucose or sugar (C₆H₁₂O₆), releasing energy and pyruvate (CH₃COCO₂H). Glycolysis is the first stage in the process of cellular respiration in organisms. Cells use glycolysis as a method to produce energy. Glycolysis is found in the great majority of organisms alive today.
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A baseball catcher puts on an exhibition by catching a 0.15 kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catchers glove 1.0 m above the ground?
a drug you're investigating demonstrates >90% absorption, but it's highest unit dose does not completely dissolve in 250 ml of solvent. the biopharmaceutics classification system would identify this drug as class:
The biopharmaceutics classification system would identify this drug as class ll drug having greater than 90% absorption.
What is biopharmaceutics classification system and which class drug have more than 90% absorption?BCS biopharmaceutics classification system is a system classifying a drug substance based on its solubility.There is a certain range of PH for this solubility to follow to be validated for human doses.Now in this question is asked about highest unit dose having absorption capacity of more than 90% and what class this drug does belong to.Class - ll is the class of drug having absorption power more than 90% and its highest unit dose does not completely in 250 ml .To know more about biopharmaceutics visit:
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What do all waves have in common?
you can always see them
They carry energy
They absorb light
They do not carry energy
Answer:
I think it's carry energy, but I'm not sure
name the three hardest substances that were tested. To what classes of solids do these substances belong? What general feature do these three types of solids have in common
Three hardest substances that were tested is aluminum, silicon dioxide and sucrose and the classes of solids do these substances belong is metallic type of solid and general feature do these three types of solids have in common are melting point and hardness
Hardest substance are that cannot be crushed, cut distorted or scrapped readily and the hardness of a substance is dictated by its crystalline structure which is regular and the three three hardest substances that were tested is aluminum, silicon dioxide and sucrose
Three substances classes of solid are also same the classes of solids these substances belong is metallic type of solid and general feature are also same of solids have in common are melting point and hardness metallic solid means metal is a solid in which hard in the nature shiny and smooth and so many metals are too hard
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Which of the following sets of quantum numbers are not allowed in the hydrogen atom? For the sets of quantum numbers that are incorrect, indicate what is wrong in each set.
(a) n = 3, ℓ = 2, mℓ = 2
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(b) n = 4, ℓ = 3, mℓ = 4
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(c) n = 0, ℓ = 0, mℓ = 0
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(d) n = 2, ℓ = -1, mℓ = 1
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(a), (b), and (d) are the sets of quantum numbers that are not allowed in the hydrogen atom.
Hydrogen is a single-electronic species i.e. only one electron is accommodated in the orbital. The electronic configuration of hydrogen is 1s¹. It expresses the set of possible quantum numbers for one electron.
n = 1; ℓ = o; m = 0The range of 'ℓ' lies between '0' to 'n-1' i.e. '0' to '0'.
The range of 'm' lies between 'ℓ-1' to 'ℓ+1' i.e. '0' to '0'.
(a) n≠3; The principal quantum number representing one electron of hydrogen is '1'.
(b) n≠4; The principal quantum number representing one electron of hydrogen is '1'.
(d) n≠2; The principal quantum number representing one electron of hydrogen is '1'.
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What chemical reaction occurs when the positive ion from one compound replaces the positive ion of the other compound to form two new compounds. represented by AB + CD = AD + CB
synthesis
decomposition
single replacement
double replacement
combustion
The chemical reaction that occurs when the positive ion from one compound replaces the positive ion of the other compound is double replacement
What is a double displacement reaction?
This is a type of reaction in which there is an exchange of ion between the reacting agent. The ion in one of the reactant replaces or displaces the ion in the other reactant to produce two new products.
The reaction between sulphuric acid and potassium hydroxide illustrates a double displacement reaction
H₂SO₄ + 2KOH —> K₂SO₄ + 2H₂O
From the above equation, we can see that K and H exchange to produce K₂SO₄ and H₂O
With the above illustration we can answer the given question as follow
AB + CD = AD + CB
The above reaction is a double displacement reaction since A and C exchange to produce AD and CB
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what statements are always true about limiting reactants? select one or more: the limiting reactant is completely used up in the reaction. there will be an excess of other reactants at the end of the reaction. the limiting reactant is always the same for a given reaction. the limiting reactant dictates the amount of product. the limiting reactant has a lower mass than other reactants.
The correct statements are:
The limiting reactant is completely used up in the reaction.
There will be an excess of other reactants at the end of the reaction.
The limiting reactant dictates the amount of product.
Which reactant will be the limiting reactant depends on the molar ratios of all the reactants in the experiment (and the coefficients in the balanced reaction equation), so it will absolutely vary depending on the reaction setup and conditions, which is why it cannot always be the same for a given reaction.
Because the molar ratios of the reactants dictate which of them will be the limiting one, it is not true that the one with the lowest mass will always be the limiting reactant.
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what is the change in internal energy (in j) of a system that absorbs 0.842 kj of heat from its surroundings and has 0.649 kcal of work done on it? give your answer in scientific notation.
Answer:
need the free questions srry yall
Explanation:
how does hybridization of atomic orbitals allow us to reconcile valence bond theory with vsepr theory? multiple select question. hybridization enables us to account for the number of singly-occupied orbitals required for bonding. hybridization enables us to predict the shapes of molecules. hybridized atomic orbitals produce new mixed orbitals that extend over the entire molecule. hybridization of atomic orbitals produces orbital shapes and spatial orientations that correlate to those predicted in vsepr theory.
Hybridization of atomic orbitals produces orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory is how they are reconciled and is denoted as option D.
What is Hybridization?
This is a term in chemistry which refers to the process in which atomic orbitals mix to form a new atomic orbital. The orbital usually has a different shape and a similar energy during the mixing process.
It helps us to reconcile valence bond theory with vsepr theory by producing orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory hence why option D was chosen.
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please help ASAP! Thank you
Answer: I think it’s C
Explanation:
I think it’s C because animal cells do not have a cell wall and the cell wall is unique to plant cells
which compound will distill first? group of answer choices the compound with the lower density the compound with the lower boiling point the compound with the higher boiling point the compound with the higher density the compound with the lower molecular weight the compound with the higher molecular weight
Answer:
So, liquid H2 will be distilled first, after this liquid N2 will be distilled, followed by liquid O2 and liquid CO2 will be distilled last.
The compound will lower molecular weight will distill out first as it will evaporate fast.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Why do we need to understand that reactions can happen at different speeds depending on the conditions?
We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.
The rate of any chemical reaction depends upon the nature of the reacting substances. Under the same conditions , reactions that appear similar have different rates of reaction. Chemical reaction proceeds in different speeds, depend on the various factors such as type of chemical transformation , temperature and other factors. the information about the speed of reaction is useful in large scale production.
Thus, We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.
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Quantum Theory proposes electrons may
be found in orbitals, which are based on
what?
Bohr's planetary model
Thompson's Plum Pudding Model
the probability of finding an electron in an
area around the nucleus
The Heisenberg-Rutherford Model
A quantum is the smallest discrete unit of a phenomenon (plural: quanta). For instance, a photon is a quantum of light, while an electron is a quantum of electricity. Quantum is a Latin word that means "quantity" or "how much?" Anything that can be measured is something that can be quantified.
How does quantum theory connect to Bohr's model?Bohr's hypothesis, often known as quantum theory, postulated that electrons move around the nucleus according to the classical principles, but with restrictions on the orbits they can take and the energy they lose as radiation when they change orbits.
The Bohr model, also known as the Rutherford-Bohr model, was first proposed by Niels Bohr and Ernest Rutherford in 1913 and describes an atomic system with an orbiting system of electrons and a small, dense nucleus that is similar to the Solar System in structure but is attracted by electrostatic forces rather than gravity.
A small positively charged nucleus is encircled by rotating negatively charged electrons in set orbits, according to the Bohr Atomic Model. He came to the conclusion that an electron will have more energy if it is placed far from the nucleus and less energy if it is located close to the nucleus.
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when given the symbol Cl-37, what is the mass and charge of this symbol?mass is 37 and charge is 37mass is 17 and charge is 37mass is 0 and charge is 0mass is 37 and charge is 17
Given the symbol Cl-37, the element is Cl, but there is no information about its charge. When this is like that, it is implicit it is an atom, that is, it is neutral, its charge is 0.
The number indicates is the mass number, so its mass is 37.
So, mass is 37 and charge is 0.
Dr. Peterson does an experiment to research the growth rate of mice. He has two groups of mice. He feeds one group a type of food and adds chemical A, which is supposed to increase growth rate. The other group he feeds the same food without chemical A added. His research shows that chemical A increases growth rate by 30%. He does the experiment 4 times and comes up with the same result each time.
Dr. Peterson concludes that chemical A does increase the growth rate of mice. Is Dr. Peterson's conclusion supported by scientific knowledge?
A. Yes; any study that involves a percentage is based on scientific knowledge.
B. No; scientific knowledge never comes from research or experiments.
C. Yes; his conclusion is supported by evidence from his experiment.
D. No; science cannot be used to research small animals such as mice.
Dr. Peterson performed an experiment in order to research the growth rate of mice. He had two groups of mice and he fed one group a type of food with added chemical which results in increasing the growth rate and fed same group of food to another batch without adding any chemicals. His research conveyed that chemical A increased the growth rate of mice by approximately 30%. He performed the same experiment 4 times and got the same result every time. Dr. Peterson concluded that the chemical A results in increase of growth rate of mice. The Interpretation of Dr. Peterson's experiment was supported by the evidence received from his experiment. Therefore, option C is correct.
In his experiment, Dr. Peterson found out that chemical A results in increasing the growth rate of mice by 30% and to make sure that the result obtained is valid and evidential, he performed the same experiment 4 times. Since every time the experiment was repeated, the result came out to be same, the closing statement from his experimental study can be accepted because they are backed by evidence.
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