CHEMISTRY HIGH SCHOOL

Which of the following molecules contains a covalent bond? (Use the electronegativity values from the periodic table link to help you answer this question.)A. HF
B. LiCl
C. CN-
D. MgO.)

Answers

Answer 1
Answer: If the electronegativity difference is less than 1.6 or when the difference is 1.6 - 2.0 and it only involves nonmetal, then the molecule contains a covalent bond.
A. HF: 4.0 - 2.1 = 1.9 (Covalent)
B. LiCl: 3.16 - 0.96 = 2.2 (Non-covalent)
C. CN-: 3.04 - 2.65 = 0.39 (Covalent)
D. MgO: 3.44 - 1.31 = 2.13 (Non-covalent)
Answer 2
Answer:

Answer:

C APEX APPROVED

Explanation:

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Which statement best explains why different gases effuse at different rates?At a given pressure, gas particles with smaller masses move faster.

At a given pressure, gas particles with smaller masses move slower.

At a given temperature, gas particles with smaller masses move faster.

At a given temperature, gas particles with smaller masses move slower

Answers

Answer: Different gases effuse at different rates because at a given temperature, gas particles with smaller masses move faster.

Explanation: The motion of particles in a gas depends on the kinetic energy of the gas particles which further depend on the temperature of the gas. Thus, the rate of gas given by Graham's law can only be stated when the two gases are at fixed temperature.

Graham's Law: This law states that the rate of effusion of gas is inversely proportional to the square root of its mass.

Mathematically,

((Rate)_1)/((Rate)_2)=\sqrt{(M_2)/(M_1)}

From the above relation, the gas particle with smaller mass will effuse faster at a given temperature.
Your answer is A. At a given pressure, gas particles with smaller masses move faster.

Hope this helps.

How are science and technology related?A. Technology is a branch of natural science.
B. Science is a branch of technology.
C. Advances in science may lead to advances in technology and vice versa.
D. Science and technology are not related

Answers

It's not A because technology is a branch of applied science. It's not B because again, technology is a branch of science, not the other way around. It's not D because they are related with one being a branch of another. Therefore, it has to be C because scientific advances do lead to technological advances.
C. Advances in science may lead to advances in technology and vice versa is the correct answer~

What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?

Answers

the answer is d in this case

Answer:

it's C

Explanation:

Giving brainliest if correct!! please help someone out?

Answers

Answer:

protons: 36

neutrons:48

electrons:36

Explanation:

the number of protons in an element is = to the atomic # (36)

the number of neutrons is the atomic mass - atomic # (84-36=48)

In a neutral charged element the # of protons = # of electrons

A speed boat is traveling at 100km/hr. How many hours will it take for the boat to cover a distance of 115km?

Answers

ans) 115/100=1.15 hours

Consider the reaction: K2S(aq)+Co(NO3)2(aq)=2KNO3(aq)+CoS(s) what volume of 0.255 M K2S solution is required to completely react with 160 mL of 0.130 M Co(NO3)2?

Answers

The volume will be "81.6 mL".

The given reaction is:

  • K_2S(aq)+Co(NO_3)_2(aq) \rightarrow 2KNO_3(aq)+CoS(s)

The values are:

Molarity of K_2S,

  • M_1 = 0.215 M

Volume of Co(NO_3)_2,

  • V_2 = 160 \ mL

Molarity of C0(NO_3)_2,

  • M_2 = 0.130 \ M

As we know,

→ V_1 = (M_2 V_2)/(M_1)

By substituting the values, we get

       = (0.130* 160)/(0.255)

       = (20.8)/(0.255)

       = 81.6 \ mL

Learn more:

brainly.com/question/3583591
based off of the chemical equation given, you know that K₂S reacts with Co(NO₃)₂ in a 1 to 1 molar ratio.  That means that the number of moles of both reactants need to be equal for both of them to completely react with each other.  

You can find the number of moles of Co(NO₃)₂ by multiplying 0.130M by 0.160L to get 0.0208 moles of Co(NO₃)₂.  That means that you need to find a volume of 0.225M K₂S that contains 0.0208 moles of K₂S.  You can do this by dividing the 0.0208 by 0.255 to get 0.0816L of K₂S.  That means that you need 81.6mL of 0.255M K₂S to fully react with 160mL of 0.130M Co(NO₃)₂.

I hope this helps.  Let me know in the comments if anything is unclear.
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