Answer:
Hydrogen
Explanation:
Hydrogen can never be central atom despite its low electronegativity
What type of substance is water?
Question 17 options:
molecule
mixture
element
compound
What is the relationship between the electron configuration of an element and the period in which that element appears in the periodic table?.
Answer:
The links are: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.
Explanation:
Which are characteristics of photosynthesis? (Select all that apply.) Oxygen is provided to animals from this process. It takes place in the flower of a plant. Plants use this process to make their food. It provides the energy that we obtain from our food.
Answer:
2 , 3 and 4
Explanation:
hope this helps you
Calculate the number of grams nitric acid (HNO3) in 375 L of a 1.00 M solution.
How would you describe the temperature of an object that has very slow moving particles?
8
Atomic #?
Atomic mass?
# of neutrons?
O
Oxygen
15.999
Answer:
eight because I think it's eight
How many moles of each atom are there in 5 moles of cu3(po4)2
The number of moles of each atom present in 5 moles of Cu₃(PO₄)₂ are:
15 moles of Cu10 moles of P40 moles of ODescription of Cu₃(PO₄)₂1 mole of Cu₃(PO₄)₂ contains 3 moles of Cu2 moles of P(2×4) = 8 moles of OHow to determine the mole of each atomThe moles of atom present in 5 moles of Cu₃(PO₄)₂ can be obtained as follow
For Cu1 mole of Cu₃(PO₄)₂ contains 3 moles of Cu.
Therefore,
5 moles of Cu₃(PO₄)₂ will contain = 5 × 3 = 15 moles of Cu
For P1 mole of Cu₃(PO₄)₂ contains 2 moles of P.
Therefore,
5 moles of Cu₃(PO₄)₂ will contain = 5 × 2 = 10 moles of P
For O1 mole of Cu₃(PO₄)₂ contains 8 moles of O.
Therefore,
5 moles of Cu₃(PO₄)₂ will contain = 5 × 8 = 40 moles of O
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The number of moles of copper, phosphorous and oxygen present in the 5 moles of Cu₃(PO₄)₂ are 15, 20 and 40 respectively.
What is stoichiometry?Stoichiometry of any chemical equation gives idea about the amount of species present before and after the reaction.
Dissociation reaction of Cu₃(PO₄)₂ is shown as below:
Cu₃(PO₄)₂ → 3Cu²⁺ + 2PO₄³⁻
From the stoichiometry of the equation, it is clear that:
1 mole of Cu₃(PO₄)₂ produces 3 moles of copper atom, 2 moles of phosphorous atoms an 8 moles of oxygen atom.
5 moles of Cu₃(PO₄)₂ = produces 3×5=15 moles of Cu
5 moles of Cu₃(PO₄)₂ = produces 2×5=10 moles of P
5 moles of Cu₃(PO₄)₂ = produces 8×5=40 moles of O
Hence required moles of copper, phosphorous and oxygen are 15, 20 and 40 respectively.
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The part of an atom that is responsible for the bonding of atoms is
Answer:
the answer is electrons
Explanation:
electrons are responsible for the chemical bonding.
Describe how electron arrangements are given using Lewis structures.
Answer:
The Lewis structure indicates that each Cl atom has three pairs of electrons that are not used in bonding (called lone pairs) and one shared pair of electrons (written between the atoms). A dash (or line) is sometimes used to indicate a shared pair of electrons: A single shared pair of electrons is called a single bond.
Explanation:
Why are xrays used to probe the crystal structure of a material
Answer:
Because X-rays have wavelengths similar to the size of atoms
X rays are used to probe the crystal structure of a material because this have same wavelength as atoms of crystal have.
What are x rays?X rays are the type of electromagnetic radiations and it is produced when the fast moving electron collide with the target anode and sudden deceleration takes place.
X rays have the high energy so that it easily penetrate in any crystal molecule as they also have same wavelength as atoms of the crystals have.
Hence due to high energy and same wavelength was of atoms of crystal it is used to probe the crystal.
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4. How many atom are in
C3H5(NO3)3
Answer:
carbon = 3
hydrogen=5
nitrogen=3
Oxygen=9
Which coefficients correctly balance the formula equation below? NH 4 NO 2 (s) N 2 (g)+H 2 O(l) A. 1, 2, 2 C. B. 2, 1, 2 D. 1, 2, 1 1, 1, 2
The coefficients which correctly balance the formula for the equation of reaction of NH₄ and NO₂ is 1,1,1,2.
What is a Balanced Chemical reaction?This is the type of reaction in which the atoms of the elements of the reactants equal that of the product.
The balanced reaction is seen below where 2 was added to H₂O so as to balance the atoms of oxygen on both sides.
NH₄ + NO₂ (s) ⇒ N₂ (g)+2H₂O(l)
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5. Summarize: What do you think would happen to the convection currents in the atmospheres and
along the coastlines if the surface of the Earth warmed up? Do you think this could have any affect
on the convection in the mantle? Why or why not? Your answer should be at least 3 sentences in
length,
Answer:
Explanation:
Image result for Summarize: What do you think would happen to the convection currents in the atmospheres and along the coastlines of the surface of the Earth warmed up? Do you think this could have any affect on the convection in the mantle? Why or why not? Your answer should be at least 3 sentences in length,
As the magma cools and solidifies, the convection currents will stop and the Earth will become geologically dead.
Help me please im stuck
Answer:
1. mechanical energy
2. Kinetic energy
3. Energy
4. Work
5. potential energy
Explanation:
1. The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy
2. All moving objects have kinetic energy. When an object is in motion, it changes its position by moving in a direction: up, down, forward, or backward.
3. Energy is defined as the ability to cause changes in matter. You can change energy from one form to another when you lift your arm or take a step. In each case, energy is used to move matter — you. The energy of moving matter is called kinetic energy.
4. transfer of energy that occurs when a force makes an object move. For work to occur, an object must move. The motion of the object must be in the same direction as the applied force on the object.
5. potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
(a) what is the approximate ductility (%el) of a brass that has a yield strength of 230 mpa (33360 psi)?
Based on the calculations, the approximate ductility (%el) of this brass is equal to 2.3%.
Given the following data:
Yield strength = 230 mpa (33360 psi).What is ductility?Ductility can be defined as an important property of a material which determines its ability to become elongated due to the application of stress.
Mathematically, the ductility of a material can be expressed as percentage elongation in length:
[tex]\% el = \frac{\Delta L}{L_i} =\frac{L_f - L_i}{L_i}[/tex]
Where:
[tex]L_i[/tex] is the original length.[tex]L_f[/tex] is the final length.[tex]\Delta L[/tex] is the yield strength.For this exercise, let us assume the original length of this brass is equal to 100 meters.
Substituting the parameters into the formula, we have;
[tex]\% el = \frac{230}{100}[/tex]
Ductility = 2.3%.
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The approximate ductility (%el) of a brass that has a yield strength of 230 mpa is 2.3%.
How do we calculate the approximate ductility?Approximate ductility of any substance will be calculated by using the below equation as:
%el = ΔL / L₁, where
ΔL = yield strength = 230 MPaL₁ = initial length = 100 MPa (assume)On putting this values, we get
%el = 230/100 = 2.3%
Hence 2.3% is the approximate ductility.
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In addition to not causing damage to the sample, what is another advantage of using a microspectrophotometer to analyze fibers?
The fiber’s spectra can also be polarized.
The sample can be quite small.
The sample can originate from a known source.
The fiber sample’s dye can be extracted.
Another advantage of advantage of using a microspectrophotometer to analyze fibers asides not causing damage to the sample is that the sample can be quite small.
What is a microspectrophotometer?Microspectrophotometry is a biological technique used to measure the absorption or transmission spectrum of a solid or liquid material in either transmitted or reflected light.
Microspectrophotometry can also measure the emission of light by a sample, which is usually small as the micro implies.
One advantage of microspectrophotometry is that the sample does not get damaged. However,
However, another advantage of advantage of using a microspectrophotometer to analyze fibers asides not causing damage to the sample is that the sample can be quite small.
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The world is divided into large areas based on their average temperatures and precipitation. what are these areas called?
climate continents
climate zones
global areas
global regions
The world is divided into large areas based on their average temperatures and precipitation is called climate zones.
What is climatic zone?The principal zones that are demarcated by lines of latitude due to which the earth can be divided on the basis of climate. Tropical zone, Subtropics zone, Temperate zone and Cold zone are the four types of climatic zones.
So we can conclude that large areas based on their average temperatures and precipitation is called climate zones.
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The world is divided into large areas called climate zones based on their average temperatures and precipitation.
What are climate zones?Climate zones are areas of the Earth that results from differences in climate such as temperature, humidity, amount of precipitation etc.
Climate zones of the globe are as follows:
Temperate Arctic or polarSubtropical TropicalTherefore, it can be said that the world is divided into large areas called climate zones based on their average temperatures and precipitation.
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If a buffer is composed of 33. 80 ml of 0. 164 m acetic acid and 31. 63 ml of 0. 189 m sodium acetate, how many ml of 0. 100 m hcl can be added before the buffer capacity is reached?
For a buffer is composed of 33. 80 ml of 0. 164 m acetic acid and 31. 63 ml of 0. 189 m sodium acetate,The volume of HCl is mathematically given as
v1=70.1148mL
What volume of HCL can be added before the buffer capacity is reached?Generally, the equation for the Chemical reaction is mathematically given as
HCl+CH3Coo-Na---->CH3CooH+NaCl
Therefore
Mole of HCl=34.37*0.204*10^-3
Mole of HCl=7.011*10^-{-3}
In conclusion
M1v1=m2v2
Therefore
[tex]v1=\frac{m2v2}{m1}\\\\v1=\frac{7.011*10^-{-3}}{0.1}[/tex]
v1=70.1148mL
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70.114 ml of 0. 100 m HCl can be added before the buffer capacity is reached
What is volume?Volume is the space occupied by a three-dimensional object.
The chemical reaction is
[tex]\rm HCl+CH_3Coo-Na---- > CH_3CooH+NaCl[/tex]
step1, calculate the moles of HCl
[tex]34.37 \times0.204\times 10^-3[/tex]
[tex]\rm Moles\; of\; HCL \;7.011\times 10^{-3}[/tex]
The given Volume 1 is 33.80 ml
The given volume 2 is 31.63 ml
By the formula, [tex]M_1V_1=M_2V_2[/tex]
Putting the values in the equation
[tex]0.164 \times 33.80 = 100 \times V_2\\\\V_2 = 70.114 ml.[/tex]
Thus, the final volume is 70.114 ml.
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v1=70.1148mL
Find δg o for the following reaction, using δh o f and s o values. H2(g) i2(s) → 2 hi(g)
The standard change in free energy is -35.76 kJ/mol. Values of standard free energy are obtained from thermodynamic tables.
What is the standard change in free energy?The standard change in free energy can be obtained using the relation;
ΔG°= ΔH° - TΔS
When;
ΔH°f(HI) = 26.466 kJ/mol
ΔH°f(H2) = 0 kJ/mol
ΔH°f(I2) = 0 kJ/mol
ΔS°f(HI) = 221.63 J/K/mol
ΔS°f(H2) = 145.64 J/K/mol
ΔS°f(I2) = 0 J/K/mol
Hence;
ΔH°freaction = [ 2(26.466)] - 0
= 52.932 kJ/mol
ΔS°freaction = [2(221.63 ) ] - [145.64 + 0]
= 443.26 - 145.64 = 297.62 J/K/mol
ΔG°= 52.932 * 10^3 - [298 * 297.62 ]
ΔG°= -35.76 kJ/mol
The standard change in free energy is -35.76 kJ/mol.
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The change in free energy for the given chemical reaction between hydrogen and iodine gas is -31.068 kJ/mol.
How do we calculate the free energy change?Free energy change of any reaction will be calculated by using the below equation:
ΔG° = ΔH° - TΔS, where
ΔH° = change in enthalpy
T = absolute temperature = 298K
ΔS = change in entropy
Change in any quantity during the reaction will be find out by substracting the reactant values from product values.
Given chemical reaction is:
H₂(g) + I₂(g) → 2HI(g)
ΔH° = 2(26.466)] - 0 = 52.932 kJ/mol
ΔS = [2(206.6) ] - [131 + 0] = 413.2 - 131 = 282.2 J/K.mol = 0.282 kJ/K.mol
On putting values on above equation, we get
ΔG° = 52.932 - (298)(0.282) = -31.068 kJ/mol
Hence required free enrgy is -31.068 kJ/mol.
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Which statement best describes the organization of the Periodic Table of the Elements?
A. Elements within a period have the same number of electrons.
B. Gases easily form compounds with other elements.
C. All gases are grouped together.
D. Elements within a group have similar properties
D. Elements within a group have similar properties.
Convert −5 ◦C to Kelvin.
Which option correctly describes the reactants and products of a chemical reaction?.
Answer:
Chemical reaction occurs when chemical bonds between atoms are formed or broken . The substance that go into a chemical reactions are called reactants, and the substance produced at the end of the reaction are known as the product .
A group of students observed a sample of soil and recorded their observations.
reddish-brown color
don’t need a magnifying glass to see grains
gritty when dry
sticks to my fingers when wet
doesn’t smell like anything
dries quickly
does not get foamy with vinegar
damp soil made a ball but it fell apart quickly
What type of soil did the students observe? Use evidence from the students’ observations to support your answer.
Based on the observations of the students, the soil they observed appears to be a sandy soil.
What is Foamy?
Foamy refers to the presence of bubbles or foam in a liquid or substance. It can be caused by a variety of factors, such as agitation, the presence of certain chemicals, or the release of gases. In the context of the soil observation mentioned earlier, the lack of foamy reaction with vinegar suggests that the soil does not contain a significant amount of carbonates, which are a common cause of foaming when they react with acids.
Evidence to support this includes the fact that the soil is gritty when dry and sticks to their fingers when wet, which are both common characteristics of sandy soil. Additionally, the observation that the soil does not get foamy with vinegar suggests that it does not contain a lot of organic matter, which is another characteristic of sandy soil. Finally, the fact that the damp soil made a ball but it fell apart quickly suggests that the soil does not have a lot of clay, which is another characteristic of sandy soil.
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A chemical reaction needs to occur at a certain temperature, but one liquid is coming from a reactor at a much hotter temperature. what might be used to cool the liquid? question 3 options: cooling pool steam turbine heat exchanger boiler
The medium that might be used to cool the hot liquid coming from a reactor is : ( C ) Heat exchanger
Function of the heat exchangerHeat exchanger is used for the transfer of heat between liquids to be used in a chemical reaction, It can be used for both Cooling and heating to achieve the desired temperature.
The liquid coming from a reactor which posses a very high temperature will be passed through the heat exchanger so that its temperature will attain the required temperature for the experiment.
Hence we can conclude that The medium that might be used to cool the hot liquid coming from a reactor is Heat exchanger.
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Consider the two triangles shown below.
Note: The triangles are not drawn to scale.
Triangles may be regarded as similar or congruent on the following basis;
1) Side angle side (SAS)
2) Side side side (SSS)
3) Angle Angle side (AAS)
What is a triangle?A triangle is a three sided figure. The figures are not shown here. However, two triangle may be regarded as similar or congruent by the following conditions;
1) Side angle side (SAS)
2) Side side side (SSS)
3) Angle Angle side (AAS)
Since the triagles are not shown here, the similarity of the triangles can not be established.
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List three reasons why nonvascular plants are important
Answer:
They are food for some animals. Some animals use them for nesting material. Humans can dry and burn some types of nonvascular plants as a fuel.
Explanation:
Some nonvascular plants produce various nutrients that are passed to the soil and can be used by other plants. Also, nonvascular plants that cover a large surface area help maintain the cohesion of the land by reducing the risk of erosion. Nonvascular plants are also very important to animals.
Hope it helps
Be great
What's the volume of 0.2 mol of hydrogen at STP.
5.6 L
22.4 L
4.48 L
2.24 L
Answer:
22.4
Explanation:
What is the best definition of the enthalpy of formation, A HA?
A. The energy released when products form in a reaction
B. The energy absorbed when products form in a reaction
C. The energy required for a molecule to form from its elements
D. The energy required for an atom to form from its subatomic
particles
Answer:
I guess the answer ia point A
In which situation might a forensic scientist decide to collect fiber evidence from a crime scene?
if collection with a paper bag or sheet of paper isn’t feasible
if there’s a risk of the evidence getting lost if it is transferred on other objects
if there’s a likelihood that fiber evidence exists at the scene of a crime
if there are multiple crime scenes with fiber items that need to be transported
Answer: C
Explanation:
C just because the other choices dont really make sense. They use these fibers as a way to see what clothes, shoe strings, carpets, etc was there it help identify a person at the scene. Hope this helps!!
Write a paragraph, citing examples from the text, to explain how Dr.
Paul Chirik's process could result in the development of flexible
manufacturing technologies.
Paul J. Chirik developed methods associated with chemistry catalysis and transition metals, which may result useful for the development of manufacturing technologies.
What is catalysis?Catalysis refers to the chemical processes that increase the rate of different types of reactions by lowering its activation energy.
Proteins (enzymes) are biological catalysts that increase the rate of chemical reactions in biological systems.
Catalysis may be reached by using transition metals (e.g., actinium and rutherfordium), which result useful in the development of manufacturing technologies.
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