Answer:
A. Memory reconstruction
The ____ chemist would study how fast nitrogen and hydrogen form
Answer:
The Bio chemist would study how fast nitrogen and hydrogen form ammonia.
Explanation:
4. In what region of the periodic table are you likely to find elements that form more than one stable
ion?
Answer:
in the middle region of the periodic table, where the transition metals are
aka between Group II and III
How many moles of each type of atom are in 1.0 mol of K2Cr2O7?
1.0 mol of K₂ Cr₂07 contains 2 mol K, 2 mol per 7 mol 0.
One mole of atoms of any element carries 6.022 X 1023 atoms, regardless of the kind of detail. Use the periodic table to determine the molar mass of the element. Divide the given mass in grams by the molar mass to locate the range of moles. Multiply the number of moles via Avogadro's wide variety to attain the variety of atoms. There are 24 atoms in a single molecule of C6 H12 06. This chemical compound has 6 atoms of carbon, 12 atoms of hydrogen, and six atoms of oxygen. this is a total of 24 atoms.
The mole is the quantity of substance of a system that includes as many fundamental entities as there are atoms in zero. 012 kilogram of carbon 12 its symbol is mol To discover the number of moles in a sample, simply weigh it and divide the weight by way of the molecular weight. The quotient is equal to the variety of moles. The number of atoms or different particles in a mole is the same for all substances divided by the mass of the substance in grams via its molecular weight. this could provide you with the range of moles of that substance that are inside the targeted mass.
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calculate the volume in (L) of 1.13x10^5 grams of liquid sodium which has a density of 0.929g/cm3
The volume of the liquid sodium is 121.64 L
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can obtain the volume of the liquid. Details below
How to determine the volume of the sodium liquidMass of liquid = 1.13×10⁵ gDensity of liquid = 0.929 g/cm³Volume of liquid =?Density = mass / volume
Thus,
Volume = mass / density
Volume of liquid = 1.13×10⁵ / 0.929
Volume of liquid = 121636.17 cm³
Divide by 1000 to express in liter
Volume of liquid = 121636.17 / 1000
Volume of liquid = 121.64 L
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Water (2450 g ) is heated until it just begins to boil. If the water absorbs 5.35×105 J of heat in the process, what was the initial temperature of the water?
Express your answer with the appropriate units.
The initial temperature of water is 47.8⁰C
In this case, the challenge is to determine how much heat is required to bring a particular sample of water from its original temperature to its boiling point.Given,
mass of water is 2450g
absorbed heat is 5.35×105 J
we have to find out initial temperature
First Calculate the change in temperature when 5.35×10^5 J of heat is provided to 2450g of water.
q = m . c . ∆T
q is amount of heat gained
m is the mass of water
c is the specific heat of the substance
∆T is change in temperature
Specific heat of water is 4.18 J/g⁰C
∆T = q / m . c
= 5.35×10^5 / 2450 × 4.18
= 52.2⁰C
Now we know that the final temperature of the water is
100⁰C and that this final temperature is 52.2⁰C
is higher than the initial temperature of the water.
So by, ∆T = T(f) - T(i)
T(i) = T(f) - ∆T
T(i) = 100⁰C - 52.2⁰C
= 47.8⁰C
Therefore, initial temperature of water is 47.8⁰C
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2NH3 + H₂SO4 → (NH4)2SO4
Calculate the percentage atom economy to form the fertiliser ammonium sulphate in the above reaction
The percentage atom economy is 62%
2NH3 + H₂SO4 → (NH4)2SO4
34 gram 98 gram 210 gram
2 mol 1 mol 1 mol
% atom economy = mass of atoms in desired product/total mass of atom in Product x 100
% atom economy = 132/210 x 100 = 0.62 = 62%
What is Atom economy ?The amount of desirable useful products produced from reactants is measured by atom economy, also known as atom efficiency. It is frequently expressed as a percentage and is referred to as percentage atom economy. The required product atoms are divided by the total number of reactants, which is equal to the total number of product atoms, to determine the percent atom economy
Higher atom economy reactions provide more of the desired product while producing less waste.
The following stages can be used as a generic method to compute the atom economy:
Create a chemical equation for the reaction provided.Equilibrate the variables.Utilizing the periodic table's atomic and formula masses, determine the masses of the reactants and products. The total mass of the reactants on the left side and the total mass of the products on the right side are always equal in a correctly balanced equation.Determine the atom economy percentage.
Hence, percentage atom economy is 62%
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PLEASE HELP ILL MARK BRAINEST!!! 35 POINTS!! THANK YOU
This chart above compares the reaction rate of a naturally occurring chemical reaction vs. the same reaction when an enzyme is involved.
a. Compare the differences between the two reactions, but also note what they have in common.
b. Explain the role the enzyme plays in the second reaction
c. Explain what the three bumps in the second reaction means and why the original reaction only has one bump.
In the image given, the difference in the activation energy is observed on addition of a catalyst in the same reaction.
Activation energy is the minimum initial energy needed for a reaction to start. It is denoted as [tex]E_a[/tex].
a) The difference between the reactions is that on addition of a catalyst, the activation energy is reduced to form the same product.
The similarity is that these peaks are basically the transition states where the energy is highest, and the reactant molecules are highly unstable and immediately get converted to the products.
b) Enzymes in the second reaction are the catalysts which increase the rate of the reaction and reduce the activation energy required for the reaction to happen. Not only do the enzymes reduce the activation energy, but they also introduce a multiple energy reaction pathway which must be fulfilled in order to form the products.
c) The second reaction is a multi-step reaction and occurs in a series of collisions, where each collision produces an intermediate molecule which collides further until the final product molecules are formed. Thus, each collision step has its own activation energy peak.
The original reaction has only one activation energy peak as the reactants collide once and form the products immediately thereby consuming a lot of energy.
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To separate a mixture of hard candies and
marbles, the most efficient method would be
DONE
To separate a mixture of hard candies and marbles, the most efficient method would be filtration .
A mixture is just the physical mixing of a mixture's constituent parts, including suspensions and colloids, that maintain their identities and are thus combined in the necessary proportions.
One or more sweetener syrups are heated to 160°C to create a sugar confection known as a hard candies , often referred to as a boiled sweet.
To avoid damaging the water pipes, boil the candies if marbles are present unless they dissolve in water. Then, place a filter in the sink and run cold water for two minutes when pouring the water into the strainer and after emptying it.
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Which statements describe the nature of science? (Select 5)
1. Scientists engage in peer reviews to avoid bias.
2. Science is a blend of logic and innovation.
3. Scientific ideas are not durable and cannot adjust to change as new data is collected.
4. Science is not observational .
5. Science is a complex social endeavor.
6. Natural world is understandable.
7. Scientists try to remain objective.
Answer:
2
Explanation:
Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.
As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.
Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.
Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
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Determine the volume of hydrogen gas needed to react completely with
5.00 L of oxygen gas to form water,
The volume of hydrogen needed to react with 5.00 L of oxygen based on the mole ratio is 10.00 L.
What volume of hydrogen gas is needed to react with 5.00 L of oxygen?The volume of hydrogen gas is needed to react with 5.00 L of oxygen is determined from the mole ratio of the reactants as shown in the equation of reaction below:
Equation of reaction: 2 H₂ + O₂ → 2 H₂O
Mole ratio of hydrogen to oxygen = 2 : 1
Moles of gases occupies equal volume
Therefore, Volume ratio of hydrogen to Oxygen = 2 : 1
Volume of hydrogen needed to react with 5.00 L of oxygen = 5.00 * 2
Volume of hydrogen needed to react with 5.00 L of oxygen = 10.00 L
In conclusion, the volume of hydrogen required is obtained from the mole ratio of hydrogen and oxygen in the reaction.
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In the Periodic Table below, shade all the elements for which the neutral atom has an outer electron configuration of ms^2nd^2, where n and m are integers, and m= n+1.
Answer:
Na+e-1=Na
Explanation:
dfh low so to homework all no lol Show
The periodic table is aanged by various patterns is there a pattern with regard to ionic charge? In three to five sentences, explain your reasoning and provide specific examples.
Answer: As you move down the column in the periodic table the ionic charge increases.
Explanation: This is because the effective nuclear charge (Z_sub_eff) provides a shielding constant so that the nuclear charge from the protons cannot interfere with the negative nuclear force of the electrons.
Yes, ionic charge patterns exist. Elements in the same group often share similar charges due to common valence electron configurations.
Indeed, a pattern emerges in terms of ionic charges within the periodic table. Elements within the same group (vertical columns) often exhibit similar ionic charges due to sharing common valence electron configurations.
For instance, Group 1 elements tend to form +1 cations (e.g., Na⁺, K⁺) by losing their single valence electron, while Group 2 elements form +2 cations (e.g., Mg²⁺, Ca²⁺) by losing two valence electrons. Similarly, elements in Group 17, known as halogens, commonly form -1 anions (e.g., F⁻, Cl⁻) by gaining one electron to achieve a stable electron configuration.
This recurring trend can be attributed to the desire of atoms to achieve a full valence shell, either by losing or gaining electrons, leading to predictable ionic charges within specific groups of elements.
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Antifreeze has a density of 0.79 g/mL. What mass of antifreeze, in grams, is required to fill a 2.5
gallon car radiator?
Note: 1 gallon = 3.785
The mass of antifreeze required to fill a 2.5 gallon car radiator is
Since, 1 gallon = 3.785 L
2.5 gallon = 9.4625 L
Given,
Gasoline = 9.4625 L x 1000 mL/L
= 9462.5 mL
Density = 0.79 g/mL
Mass = Density x volume (density = mass )
Mass = 0.79 g/mL x 9462.5 mL volume
Mass = 7475.37 g
Therefore,
Mass of antifreeze, in grams = 7475.37 g
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An increase in the concentrations of greenhouse gases in Earth’s atmosphere would have which of these effects on temperature?
An increase in the concentrations of greenhouse gases in Earth's atmosphere would cause an increase in the average temperatures on Earth's surface.
The greenhouse effect occurs when gases build up in the upper atmosphere of the Earth, where they absorb solar heat and trap it. Thus, the heat that ought to be fleeing into space is being held back on Earth. The following gases contribute to this effect:
Dioxide of CarbonMethaneNitrogen Oxidewith a ton more. However, the greenhouse effect is mostly caused by them. By retaining heat in the lower (rather than upper) atmosphere, this action will raise temperatures on the surface of the globe.
Heat from the sun would be trapped on Earth as the concentration of greenhouse gases (such the ones described) in the atmosphere increased, resulting in an increase in the global temperature.
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What law says the total amount of
substance at the beginning of a
reaction must match the amount of
substance at the end of the reaction?
A. Law of Conservation of Energy
B. Law of Conservation of Moles
C. Law of Conservation of Heat
D. Law of Conservation of Mass
Answer:
d) law of conservation of mass
Explanation:
voodoo money voodoo money voodoo money?
Answer:
voodoo voodoo voodoo
What is the independent variable?
Time or Concentration?
find heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C
Heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C is 22.23 J/ ∘C g .
from the above statement we have got
Q = 47.0 J
MASS = 13.0 g
temperature (T) = 1.71 ∘C
heat capacity ( c ) = ?
NOW, from the formulae , Q = mcΔt
put all the values given in equation
47.0 J = 13.0 g [tex]\times[/tex] c [tex]\times[/tex]1.71 ∘C
c = 47.0 ÷ 13.0[tex]\times[/tex]1.71
c = 47/22
c = 22.23 J/ ∘C g
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Question 5 (1 point) Which statement is NOT TRUE about molecules and compounds? a All molecules and compounds are made of atoms. b Compounds are made up of the same type of atom. c All molecules are compounds. d Molecules are made up of two or more chemically bonded atoms.
All molecules are not compounds. Option C.
What are compounds?A compound is a substance made from two or more atoms of different elements that are linked together by bonds. The bond could be an ionic, covalent, metallic, or hydrogen bond.
A molecule, on the other hand, is a group of atoms, the same or different, chemically bonded together and represents the smallest fundamental unit that can participate in chemical reactions.
Going by these two definitions, one can conclude that while all compounds are molecules, not all molecules are compounds. If the group of atoms that bond together is chemically identical, a molecule is formed but not a compound.
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convert 64.3 kilograms to milligrams
Answer:
64.3 kilograms = 64300000 milligrams
Hope this helps :)
Belching (burping) cows give off much of the methane, a greenhouse gas, from raising farm animals. Now researchers are investigating a way to reduce the greenhouse gas that is burped by cows.
In one study, scientists fed a group of dairy calves (which are cows that produce milk) a methane-blocker chemical. Sensors at feeding stations measured methane in the cows’ gas while the animals were nearby. That allowed the team of researchers to estimate the methane being belched (burped) out each day.
Over their first year of life, the treated cows, which received the methane-blocker chemical, released about ten percent less methane than the group of cows not given the chemical.
What can you infer or conclude based on the evidence from the passage?
*Your response should include the evidence to support your conclusion.
Cows and other ruminants are significant producers of the greenhouse gas methane—contributing 37 percent of the methane emissions resulting from human activity.
What is greenhouse gas?Greenhouse gases (also known as GHGs) are gases in the earth's atmosphere that trap heat. During the day, the sun shines through the atmosphere, warming the earth's surface. At night, earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere.
While carbon dioxide is typically painted as the bad boy of greenhouse gases, methane is roughly 30 times more potent as a heat-trapping gas. As temperatures rise, the relative increase of methane emissions will outpace that of carbon dioxide from these sources, the researchers report.
The cow's ramen is like a large fermentation vat. More than 200 different bacteria and 20 types of protozoa help the cow to utilize fibrous feed stuffs and non-protein nitrogen sources. Bacteria adhere to the feed and gradually digest the fermentable material.“You can probably reduce methane by about 20-25% by altering diet,” he says.
One study by researchers at the University of California, Davis, estimated it might be possible to reduce global methane emissions from cows by 15% by changing their diet.
Thus, this evidence support the passage.
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What is the number of C atoms in 0.247 mol of C.
The number of C atoms in 0.247 mol of C is 1.48 X 10²³ .
The number of C atoms in 1 mol of C is 6.02 X 10²³, which is also called Avogadro’s number .
so, The number of C atoms in 0.247 mol of C is _
0.247x6.02x10²³= 1.48 X 10²³.
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Plan an investigation to explore the relationship between properties of substances and
the electrical forces within those substances.
Approximately 50 minutes
I
What can properties of substances tell us about the electrical forces within those
substances?
In this activity, you will plan and conduct an investigation to compare a single property
across several substances. You must select a measurable property, such as boiling point
or surface tension. After your investigation, you will compare the results and use your
data to make inferences about the strength of the electrical forces in each substance you
tested.
The physical and chemical properties of a compound is dependent upon its bond strength. Physical properties such as boiling, melting point etc . increases with bond strength. Solubility decreases with increase in bond strength.
What is bond strength?The bond strength of a molecule or compound is the measure the energy to break or form the bond. That it tells how much strong the bond is. It directly proportional to the bond order.
Boiling point of a compound is the temperature at which the compound changes from liquid to gas state. Melting point is the temperature at which a to liquid form. All these phase changes are dependent on the electrical force within the molecules.
As the electrostatic force of attraction increases, more energy have to be applied to it to weaken the bonds and make the molecules apart. Therefore, the boiling point and melting point increases.
Similarly the molecules with higher bond strength have less solubility at normal conditions. The reactivity of molecules decreases as their bond strength increases since more energy needed to break the bonds.
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Moisture is in the air, as compressed air cools it condenses, why must moisture be removed from air feeding pneumatic controls?
The moisture must be removed from air feeding pneumatic controls because moisture corrodes the walls of an air cylinder, dilutes the oil needed for the head and rod, and reduces reaction time.
What is the mechanism of a pneumatic controller?
A pneumatic controller is a mechanical apparatus created to gauge temperature or pressure and send a corrective air signal to the last control element. The heat or pressure sensing system and the air signal relay system work together to power a pneumatic controller.
Moisture corrodes the walls, dilutes the oil needed for an air cylinder's head and rod, and slows reaction time. Efficiency and output are lost as a result. Rubber valve diaphragms may harden and rupture if moisture is allowed to get to them. Spools and pistons can develop pits as a result of moisture.
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Please and thank you
Answer:28, 34, 85, 6.6
Explanation:
What's a fear, concern, or worry you have? How can you best prepare to tackle this obstacle? (Write 2 to 3 complete sentences) ¿Qué miedo, preocupación o preocupación tienes? ¿Cómo puedes prepararte mejor para enfrentar este obstáculo? (Escribe de 2 a 3 oraciones completas)
Ayuda plis.
Answer:
I'm worried about going to college and living in a dorm. I'm currently keeping in touch with my roommates to know what kind of people they are. Also, I'm starting to pack and get ready to move to my dorm.
Explanation:
a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm. what is the average density in kilograms per liter of the crackers in the package? Assume that the unused volume is negligible.
The average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.
How to calculate average density?The density of a substance is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated using the following formula:
D = m/v
Where;
D = densitym = massv = volumeAccording to this question, a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm.
Volume = 7.0cm X 17.0.cm X 19.0 cm = 2261cm³
1 cubic centimetre = 0.001 litre
2261cm³ = 2.261L
Density of the crackers = 0.25kg ÷ 2.261L
Density = 0.1105Kg/L
Therefore, the average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.
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Calculate the formula mass of sodium sulfate decahydrate, Na2SO4⋅10H2O , in atomic mass units (amu or u).
Answer:
Na
2
SO
4
.10H
2
O
=(2×23)+32+(4×16)+(10×18)
=46+32+64+180
=322
List three possible reasons why Zara cannot see any cells.
Zara is examining some animal cells on a slide using a microscope. She is aware that there are animal cells on the slide, but she is unable to see any cells when using the microscope. Give three reasons why Zara might not be able to notice any cells.
Understanding organelles has been greatly aided by microscopes. Most organelles cannot be seen using a light microscope, and those that can (such as the nucleus, mitochondria, and Golgi) cannot be studied in detail because of their size, which is near to the light microscope's resolution limit.
The other cell organelles are too tiny and do not adhere to the dye to be visible under a lab microscope.
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I
Based on the information below, which of the following are atoms of the same element? (mark all that apply)
Atom A
Atom B
Atom C
8 protons
8 neutrons
8 electrons
10 protons
10 neutrons
10 electrons
8 protons
10 neutrons
8 electrons
end
Based on the information below . The atoms of the same element are Atom A and Atom C .
Atoms of same element have the same atomic number. so the number of protons and electron are same but they have different atomic masses called as Isotopes. so, the atoms having different number of neutron will have different masses.
In the given case ,
Atom A Atom B Atom C
8 protons 10 protons 8 protons
8 neutrons 10 neutrons 10 neutrons
8 electrons 10 electrons 8 electrons
so, In Atom A and Atom C , the number of protons and electrons are same but the have different atomic masses means having different no. of neutrons. so Atom A and Atom C are the atoms of same elements.
Hence,Based on the information below . The atoms of the same element are Atom A and Atom C.
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