CHEMISTRY HIGH SCHOOL

Which characteristics of the planets in our solar system increases as the distance from the sun increases?A- equatorial diameter
B-eccentricity of orbit
C- period of rotation
D-period of revolution

Answers

Answer 1
Answer: As the distance from the sun increases the PERIOD OF REVOLUTION increases which is the time it takes to a body to spin such as the sun

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Which of the following chemical reactions is an oxidation-reduction reaction? CuSO4 + BaCl2 yields BaSO4 + CuCl2 Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3 N2 + 3H2 yields 2NH3 K2SO4 + BaCl2 yields BaSO4 + 2KCl

Answers

Answer : The correct option is, N_2+3H_2\rightarrow 2NH_3

Explanation :

(1) CuSO_4+BaCl_2\rightarrow BaSO_4+CuCl_2

(2) Pb(NO_3)_2+2NaCl\rightarrow PbCl_2+2NaNO_3

(3) K_2SO_4+BaCl_2\rightarrow BaSO_4+2KCl

The reactions 1, 2, and 3 are the example of double-displacement reaction in which the cation and anion of the two reactants exchange their places to give two new compounds.

(4)N_2+3H_2\rightarrow 2NH_3

This reaction is an example of oxidation-reduction reaction.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases.

In this reaction the oxidation state of nitrogen and hydrogen is (0) and the oxidation state of nitrogen and hydrogen in NH_3 are, (-3) and (+1). So, from this we conclude that the nitrogen shows reduction reaction and hydrogen shows oxidation reaction.

Hence, the correct option is, N_2+3H_2\rightarrow 2NH_3
The answer is N2 + 3H2 yields 2NH3. The oxidation-reduction reaction means that there is electrons transfer during the reaction which means that the valence changed.

In a reaction progress curve, each peak of the curve corresponds to _____ of the reaction.

Answers

an activated complex
In a reaction progress curve, each peak of the curve corresponds to the activation energy of the reaction.

The positively charged particles found in the nucleus of an atom are called ______.a. nuclear forces.
b. electrons.
c. protons.
d. subatomic particles.

Answers

the answer is (c) protons

As the temperature of a chemical reaction in the gas phase is increased, the rate of the reaction increases because(1) fewer particle collisions occur
(2) more effective particle collisions occur
(3) the required activation energy increases
(4) the concentration of the reactants increases

Answers

Answer: option (2) more effective particle collisions occur.


Justification:


Always keep in mind that the temperature is a measure of the average kinetic energy of the particles.


The higher the temperarute the hiigher the kinetic energy.


Also, remeber that the kinetic energy is the energy of motion: the higher the kinetic energy the hgher the speed of the particles and the more energetic the collisions.


Therefore, those more energetic collisions will increase the number of collisions that overcome the activiation energy leading to higher rate of conversion (reaction), whic is what a more effective particle collisions occur mean.

Why do we crack molecules?

Answers

We need to crack molecules in order for us to get the desired molecule. For example, in the extraction of crude oil, after entering the fractional distillation, it will give products base on their molecular structure. The products are gasoline, diesel fuel, jet fuel, wax, asbestos,kerosene.
cracking is the process whereby complex organic molecules such as kerogens or long chain hydrocarbons are broken down into simpler molecules such as light hydrocarbons,. 
it is done to get more important substances

Which component is required for the activation of some enzymes?a) Presence of a co-factor
b) Basic pH levels in the substrate
c) Higher enzyme concentration
d) Lower temperature in the substrate

Answers

The correct answer is option A.

Presence of a co-factor is required for the activation of some enzymes. Co-factors are generally metal ions or small molecules (non-protein).Co-factors helps enzymes bind substrate tightly.  For example, NAD⁺/NADH is a co-factor which is required for the activation of the enzyme dehydrogenase. NAD⁺ is the oxidized form and NADH is the reduced form.

The best answer is letter A. 
The main factors that change the speed of enzymatic reactions are temperature, pH and substrate concentration (quantity). There are enzymes that need other associated molecules to work. These molecules are called enzyme co-factors. They can be organic ions like mineral salts.
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