CHEMISTRY HIGH SCHOOL

A nuclear reaction_____________. a. is a chemical reaction on a smaller scale
b. involves sharing of electrons between atoms
c. involves changes within the nucleus
d. is always extremely dangerous

Answers

Answer 1
Answer: A nuclear reaction is quite different from a normal chemical reaction in the sense that there are C. Changes that take place between the neutrons and protons in the nucleus.

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MIDDLE SCHOOL

Consider the general reversible reaction. aA + bB
C + dD
What is the equilibrium constant expression for the given system?
0
c[C]d[D]
a[A]b[B]
[C][D]
[A][B]
0
[A][B]
0
[C] [D]
[C]°[
DO
0
[A]*[B]"

Answers

Answer:

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as

The expression for for the given reaction is written as:

where a, b , c and d are respective stoichiometric coefficients for A, B, C and D.

Answer:

D) Cc Dd/Aa Bb

Explanation:

just did it

MIDDLE SCHOOL

What is one example of a molecule that is not a compound?

Answers

Br2 or O2 or N2 or H2 or F2 or I2 etc.

Answer:

H2 is a molecule

Explanation:

Hydrogen gas H2 is a molecule not a compound because it is made up of similar elements.

HIGH SCHOOL

If the substance being oxidized is in direct contact with the substance being reduced, what will be produced? a. mass
b. heat energy
c. friction energy
d. potential energy

Answers

The correct option is D. When an oxidant and a reductant are in direct contact, a potential energy is generated whose value is determined by the potential differences between the valence electrons in atoms of the participating elements. The oxidant is the species that gains electrons and is reduced in the process while the reductant is the specie that loses electrons and is oxidized in the process. 
HIGH SCHOOL

Is it C??? Which of the following materials contains components in a fixed ratio?


A.
element


B.
compound


C.
mixture


D.
solution

Answers

The right answer is indeed letter c

Answer: B. compound

Explanation: "A compound is a substance made up of two or more elements that can only be separated by chemical means. The elements that make up the compound are always resent in the same ratio."

"A mixture does not have a fixed ratio. The components of a mixture keep their unique properties and identities. They can be separated physically."

I know this is late but maybe it will help someone else in the future.

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