Question

7.Why does a higher concentration increase the rate of reaction?(1 point)
Responses

It decreases the amount of reactants.
It decreases the amount of reactants.

It lowers the activation energy.
It lowers the activation energy.

It increases the surface area of the particles
It increases the surface area of the particles

It increases the frequency of collisions.
6.Grinding a Tylenol tablet into powder increases the rate of reaction due to increased _________.
Tylenol Extra Strength Caplets, Fever Reducer And Pain Reliever, 500 Mg - Shop Medicines & Treatments at H-E-B

(1 point)
Responses

temperature
temperature

reactants mass
reactants mass

surface area
surface area

concentration
5.Which statement correctly compares synthesis and decomposition reactions?

Meme Creator - Funny at least I know the difference between ...



(1 point)
Responses

Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form AB → A + B, while decomposition reactions are in the form A + B → AB.
Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form AB → A + B, while decomposition reactions are in the form A + B → AB.

Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form A + B → AB, while decomposition reactions are in the form AB → A + B.
Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form A + B → AB, while decomposition reactions are in the form AB → A + B.

Synthesis and decomposition reactions are both neutralization reactions. Synthesis reactions are in the form A + B → AB, while decomposition reactions are in the form AB → A + B.
Synthesis and decomposition reactions are both neutralization reactions. Synthesis reactions are in the form A + B → AB, while decomposition reactions are in the form AB → A + B.

Synthesis and decomposition reactions are both neutralization reactions. Synthesis reactions are in the form AB → A + B, while decomposition reactions are in the form A + B → AB.
4.Methane (CH4
) is a gas that is found in small quantities in Earth's atmosphere. Which type of bonds does methane have?(1 point)
Responses

Covalent
Covalent

Exothermic
Exothermic

Ionic
Ionic

Metallic
3.Are the following examples of chemical or physical changes?(8 points)
Chemical change Physical change
A silver spoon tarnishing


Blowing a dandelion


Building a sand castle


Toasting bread
2.Balance the following the chemical equation:

_ Mg + _ F2 → _ MgF2

(1 point)
Responses

1:1:2
1:1:2

1:2:1
1:2:1

1:1:1
1:1:1

2:1:1
1.Looking at the periodic table, determine the number of valence electrons present in Phosphorous (P).(1 point)
Responses

2 valence electrons
2 valence electrons

3 valence electrons
3 valence electrons

4 valence electrons
4 valence electrons

5 valence electrons

Answer 1

7. Increases the frequency of collisions.
6. Surface area.
5. "Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are A + B → AB, decomposition reactions are AB → A + B."
4. Covalent.
3. A silver spoon tarnishing — Chemical change.
Blowing a dandelion — Physical change.
Building a sand castle — Physical change.
Toasting bread — Chemical change.
2. 1 : 1 : 1 (Mg + F2 → MgF2).
1. 5 valence electrons.