The number of protons and neutrons together makes the total atomic mass of the element. The atom of chromium has 28 neutrons. Thus, option b is correct.
What is an atomic mass?An atomic mass is the property of an element that defines the number of protons and neutrons of the atom placed in a periodic table. The atomic mass is represented at the lower half of the atomic symbol.
The atomic mass is the sum of the neutrons and the protons that are held together in the nucleus of the atom as a concentrated mass. The atomic number is given as,
Atomic number = number of protons + number of neutrons
Given,
The atomic mass of chromium = 52
Number of protons = 24
Substituting values above:
52 = 24 + number of neutrons
number of neutrons = 52-24
= 28
Therefore, the number of neutrons of a chromium atom is 28.
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Answer: option b, 28
Which type of graph is best used to show how a measured quantity changes over time?
Box and whisker plot
Line graph
Circle graph
Histogram
How would you measure the mass and weight of an object?
Answer:
Weight = mass × earth's gravitational acceleration
Explanation:
Follow the following steps to measure the mass and weight of an object:
Measure the mass of the object using an accurate measuring scale.Multiply the mass of that object with earth's gravitational acceleration which is approximately 9.8 N/kgWhat type of reaction is: ammonium nitrate -> dinitrogen monoxide + water?
Answer:
The thermal decomposition of ammonium nitrate to produce dinitrogen monoxide and water. This reaction takes place at a temperature of 200-260°C.
Triangle DEF is congruent to TriangleD'EF' by the SSS theorem. Which single rigid transformation is required to map TriangleDEF onto TriangleD'EF'? dilation reflection rotation translation
Answer:
B. reflection
Explanation:
Rigid transformations are methods involved in changing the dimensions or orientation of a given figure. The methods are; dilation, rotation, translation and reflection.
Reflection is the process in which a given figure is turned or flipped with respect to a point or line of reference.
In the given question,
ΔDEF ≅ ΔD'EF' (Side-Side-Side congruence property)
This implies that ΔDEF was reflected about point E to produce ΔD'EF'. Thus the required rigid transformation is reflection.
Answer:
Is C - Rotation
Explanation:
I have right on my test
Design a voltaic cell using magnesium as one of the electrodes. Magnesium can be represented as either Metal A or Metal B in the above drawing. Use metal chlorides as the solutions in the two chambers. For example, magnesium chloride, (MgCl2) will be in solution in the chamber with the magnesium electrode. Use NaNO3 in the salt bridge. Select another element for the other electrode. Explain why you selected this element. Include information about the activity of the metal you select and the need for a spontaneous reaction. Metal A: Metal B: In the drawing, 1. Label the oxidation compartment: 2. Label the reduction compartment. 3. Label the direction of the flow of electrons. 4. Label the flow of the magnesium ions. 5. Label the flow of your selected element's ions. 6. What is leaving the salt bridge in the anode compartment? 7. What is leaving the salt bridge in the cathode compartment? 8. Write the oxidation and reduction half-reactions. 9. Calculate the chemical potential of your cell. Show all of your work.
Answer:
Here's what I get
Explanation:
You haven't shown your drawing, so I will assume that Metal A is the anode and Metal B is the cathode.
I will make a galvanic cell using Mg and Zn as the metals.
I selected Zn because it is common and readily available in the lab.
Zn is lower than Mg in the activity series, so Mg should be able to displace Zn from its salts
The standard reduction potentials are:
E°/V
Zn²⁺ (aq) + 2e⁻ ⇌ Zn(s); -0.76
Mg²⁺(aq) + 2e⁻ ⇌ Mg(s); -2.38
The Mg half-reaction has the more negative potential, so it will be the oxidation half-reaction.
8 and 9. Oxidation and reduction half-reactions and cell potential
E°/V
Oxidation: Mg(s) ⇌ Mg²⁺(aq) + 2e⁻ ; +2.38
Reduction: Zn²⁺ (aq) + 2e⁻ ⇌ Zn(s); -0.76
Mg(s) + Zn²⁺ (aq) ⇌ Mg²⁺(aq) + Zn(s); +1.62
The cell potential is positive, so the reaction will be spontaneous.
Mg is the anode, so it is Metal A.
Zn is the cathode, so it is Metal B.
1. The Mg|Mg²⁺ half-cell is the oxidation compartment.
2. The Zn²⁺|Zn half-cell is the reduction compartment.
3. The electrons flow from anode to cathode in the external circuit.
4. The Mg²⁺ ions flow from the Mg through the solution to the salt bridge.
5. The Zn²⁺ ions flow from the solution to the Zn.
6. NO₃⁻ ions flow from the salt bridge into the anode compartment to balance the charge of the developing Zn²⁺ ions.
7. Na⁺ ions flow from the salt bridge into the cathode compartment to replace the charge of the depleted Zn²⁺ ions.
why can't we extract sodium from aqueous solution of sodium chloride
Answer:
As it is an aqueous solution the sodium is dissolved in the water, if you want to extract it use evaporation
Explanation:
unknown substance is heated from 10 celsius to 25 celsius, what happens at 17 Celsius
At 17 celsius ❤️
it will start to boil ❤️
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What is a scientific question?
O A. One that everyone agrees on
OB. One that only scientists ask
O c. One that is answered through observation
O D. One that never changes
Answer:
O c. One that is answered through observation
I used process of elminations so
Explanation:
One that everyone agrees one doesnt mean it's accurate.
Only the one that scientists ask doesnt make sense
One that never changes and One that is answered through observation.... So C
Which event is most likely occurring? diffusion because particles move from regions of high concentration to regions of low concentration diffusion because particles move from regions of low concentration to regions of high concentration effusion because there is a movement of a gas through a small opening into a larger volume effusion because there is a movement of a gas through a large opening into a smaller volume
Answer: c
Explanation: effusion because there is a movement of a gas through a small opening into a larger volume
If the pH of a weak acid solution is 2.500 and the solution has a concentration of 0.100M, what is the Ka of the weak acid HA?
Answer:
The Kₐ of the weak acid is 1.033×10⁻⁴
Explanation:
The dissociation of a weak acid in aqueous solution is limited to about 5 to 10%
The acid dissociation reaction is given as follows;
HA (aq) + H₂O (l) → H₃O⁺(aq) + A⁻ (aq)
Given that the pH = 2.5, we have
pH = -log₁₀[H₃O⁺] = 2.5
∴ [H₃O⁺] = 10^(-2.5) = 0.0031623
[tex]K_a = \dfrac{[H_3O^+][A^-]}{[HA]}[/tex]
Kₐ = [H₃O⁺][A⁻]/[HA] = (0.0031623^2)/(0.1 - 0.0031623) = 1.033×10⁻⁴
The acid dissociation constant, Kₐ for weak acid is very low as obtained
In nuclear fusion, small fragments, like atomic nuclei, neutrons, and other particles, form when energy is released. TRUE FALSE
Answer:
TRUE
Explanation:
It is true because along with energy, nuclear fusion releases other particles as well. This can include neutrons or atomic nuclei. An example of this is when hydrogen isotopes (D + T) fuse together to create helium it also releases a neutron. Thus D+T --> He + n + energy.
Therefore the answer is TRUE.
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular
theory?
higher temperature - more kinetic energy - more space between particles - higher volume
higher temperature-less kinetic energy less space between particles - higher volume
higher temperature → more kinetic energy less space between particles > lower volume
higher temperature-less kinetic energy → more space between particles lower volume
3
and wit
Answer:
A.
Explanation:
Higher temperature - more kinetic energy - more space between particles - higher volume.
A π bond could be formed from the overlap of which two orbitals? A) two sp² hybrid orbitals B) a 1s and a sp² hybrid orbital C) a sp and a sp² hybrid orbitals D) two unhybridized p orbitals
Answer:
D) two unhybridized p orbitals
Explanation:
In covalent bond, to form a bond, each of the two participating atoms would put down an unpaired electron to be used in forming a shared pair of electrons between them.
There are two types of covalent bonds:
A sigma bond [tex]\sigma[/tex]
A pi bond [tex]\pi[/tex]
A sigma bond is formed when a hybrid orbital (sp,sp² and sp³) overlaps with another hybrid orbital or with s- or p- orbital.
A pi bond is formed when a p-orbital overlaps with another parallel p-orbital laterally. This implies that ,a π bond could be formed from the overlap of two unhybridized p orbitals.
You arrive home from class to find your roommate complaining of a headache, dizziness, and nausea. Upon further investigation you believe they may have carbon monoxide poisoning. What should be the first step taken?
Answer:
tempature of the person, check carbon levels in the house or place where the person is.
Explanation:
What statement discribes the relationship of voltage and current
Answer:
Explanation:
Ohm's Law. The relationship between voltage, current, and resistance is described by Ohm's law. This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r.
This law relates a planet's orbital period and its average distance to the Sun.
The orbits of planets are ellipses with the Sun at one focus.
The speed of a planet varies, such that a planet sweeps out an equal area in equal time frames.
Answer:
These are Kepler's Laws of Planetary Motion
Explanation:
Answer:
its Keplers third law,
then first law,
then second law
Explanation:
The graph compares the kinetic energies of the molecules in four gas samples. Each graph shows a normal distribution, so the average is the center. Which sample is likely to have the lowest temperature? (1 point) A B C D
Answer:
d
Explanation:
i got it right
Gas A is likely to have the lowest temperature. Hence, option A is correct.
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.
In a gas, the kinetic energy is directly proportional to the temperature under constant pressure and volume.
As you can see in the problem, the average of A has low kinetic energy. But the average is increasing between B, C and D.
As gas A has the lowest average kinetic energy:
Gas A is likely to have the lowest temperature
Hence, option A is correct.
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)Assertion: Corrosion is a beneficial process for metals. Reason : Galvanising and electroplating of metals prevent corrosion.
what is the scientific name for the layer of gas that surrounds the earth A. hydrosphere B. biosphere C. atmosphere D. lithosphere
Answer:
hydro
Explanation: hydrogen
Answer:
C. Atmosphere
Explanation:
First, let’s define each answer choice.
Hydrosphere: all of the water on Earth
Biosphere: the global ecosystem where organisms live
Atmosphere: the envelope of gases around the planet
Lithosphere: the outermost part of the Earth( the crust and upper mantle)
The question asks us to find the scientific name for the layer of gas that surrounds the Earth. The best choice is C. Atmosphere.
using equation of reaction mention 4 methods of preparation of hydrogen
Explanation:
1. Displacement of hydrogen from water by using metal
2. Electrolysis of water using the apparatus known as the HOFMAN VOLTAMETER
3. Cracking of petroleum
4. Action of steam on hot coke
Consider the half reaction below.
Which statement best describes what is taking place?
Chlorine is losing electrons and being oxidized. Chlorine is losing electrons and being reduced. Chlorine is gaining electrons and being oxidized. Chlorine is gaining electrons and being reduced.
Answer:
balancing of charges of both sides
Answer:
A
Explanation:
A...............................
What is the change that turns paper into ashes ? Why ? give reasons
Answer:
Chemical changeExplanation:
Burning paper is a chemical change.
Burning (or combustion ) is a high temperature chemical reaction that takes place between fuel and an oxidant(mostly oxygen)
Research has proved has taught us that ;
When paper is burned , the oxygen (from the air) combines with carbon and hydrogen in the paper turning some of it into carbon dioxide and water vapor, which waft away with carbon particulates in the smoke
I hope it helps :)
In which particle model are the red and blue particles MOST LIKELY to bump into each other? PLEASE HELP WILL MARK BRAINLIEST!!
Answer:
441
Explanation:
In particle model A are the red and blue particles MOST LIKELY to bump into each other and the correct option is option A.
What is Particle Model of Matter?The particle model of matter is a theory that explains how the particles that make up a substance are arranged, and how they move and interact with each other.
The particle model explains the properties of solids, liquids and gases. The particle model can explain changes of state.
Particles of matter have spaces between them. Atoms and molecules have spaces between them. In a gas, there are large spaces between them. In a a liquid they are closer together. In a solid, the particles are packed close enough together they can hardly move.
Therefore, In particle model A are the red and blue particles MOST LIKELY to bump into each other and the correct option is option A.
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Why does anhydrous aluminium chloride have lower melting point than anhydrous aluminium fluoride?
Answer:
Explanation:
Molecule of aluminium fluoride is more polar than molecule of aluminium chloride . It is so because fluorine is more electronegative than chlorine . On Pauling scale , the electronegativity of fluorine is 3.98 whereas that of chlorine is 3.16 . Hence in aluminium fluoride , there is stronger inter molecular bonding because of more polar nature of molecules . In aluminium chloride , there is weaker inter molecular bonding because of comparatively polar nature of molecules . Hence melting point of anhydrous aluminium fluoride is higher than that of anhydrous aluminium chloride .
Given 16.2 grams of substance Y, if the substance absorbs 2722 joules of energy and the specific heat of the substance is 9.22 J/g·°C, what is the final temperature of the substance if the initial was 26 degrees Celsius?
Answer:
Final temperature (T) = 44.22°C (Approx)
Explanation:
Given:
Mass of Y (m) = 16.2 gram
Energy required (q) = 2722 J
Specific heat of the substance(c) = 9.22 J/g·°C
Change in temperature ΔT = T - 26°C
Find:
Final temperature (T)
Computation:
q = mcΔT
2722 = (16.2)(9.22)(T - 26°C)
18.224 = T - 26°C
T = 26 + 18.224
T = 44.224°C
Final temperature (T) = 44.22°C (Approx)
Julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. She places a
single mark on the sidewalk next to the snail.
What will Julie use the mark for initially?
determining how fast the snail moves
acting as a standard unit of measure
determining the displacement of the snail
O acting as a reference point for detecting motion
The single mark placed on the sidewalk by Julie has been acting as the reference point for detecting the motion of the snail. Thus, option D is correct.
The snail has been the shelled animal that has been mostly residing in the resting condition with limited movement. To evaluate the movement of the snail, there has been the consideration of a point that was the starting point from the movement.
The line that has been set across the sidewalk has been acting as the reference, and the distance traveled has been calculated from that point. Thus, option D is correct.
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When N2gas is passed through water at 293k.how many moles of N2 dissolve in 1litre water
Answer: 7 milimoles of [tex]N_2[/tex] dissolve in 1 litre water.
Explanation:
Given: [tex]N_2[/tex] gas is passed through water at 293K.
Assumption :[tex]N_2[/tex] exerts a partial pressure of 0.987 bar.
Take : Henry's constant [tex]p_N_2[/tex] = 76.8 Kbar
[tex]K_H=76800[/tex]
To find : Number of moles of [tex]N_2[/tex] gas dissolve in 1 litre water.
According to Henry's law,
[tex]p_N_2=K_HX_{N_2}[/tex]
[tex]\Rightarrow\ 0.987=76800X_{N_2}[/tex]
[tex]\Rightarrow\ X_{N_2}=\dfrac{0.987}{76800}=0.0000128515625\approx1.29\times10^{-5}[/tex]
moles in 1 liter of water = [tex]\dfrac{1000}{18}=55.56\ [\text{Molar mass of }H_2O=18\ g][/tex]
Let n= moles of nitrogen
Total moles = 55.56+n
So,
[tex]X_{N_2}=\dfrac{n}{55.56+n}=1.29\times10^{-5}\\\\\Rightarrow\ 55.56\times1.29\times10^{-5}+1.29\times10^5n=n\\\\\Rightarrow\ n- 1.29\times10^5n=0.000714033\\\\\Rightarrow\ 0.999987n=0.000714033\\\\\Rightarrow\ n\approx7\text{ milimoles}[/tex]
Hence, 7 milimoles of [tex]N_2[/tex] dissolve in 1 litre water.
How do gases responsible for acid rain get into the atmosphere
Which electrons are the valence electrons of the atom?
O A. The electrons closest to the nucleus
O B. The electrons that have lost their charge
O C. The electrons farthest away from the nucleus
O D. The electrons that have entered the nucleus
Answer:
[tex]\boxed{C}[/tex]
Explanation:
The electrons farthest away from the nucleus are the valence electrons of an atom.
The valence electrons are the electrons orbiting in the last shell around the nucleus.
Answer:
Option C
Explanation:
The electrons that are the farthest away from the nucleus are valence electrons. These are electrons are present in the outermost shell which is also called valence shell.
in terms of bonds what would the molecule C6H12 be classified as
It has a double C=C bond so that means it's unsaturated, but it can also be a cyclic compound with only simple C-C bonds
Alkene
I did the test