Chemical Changes and Conservation of Mass

Question 1

Name that reaction:

Accepted Answer

combustion

Question 2

What would the formula be for a compound made from the ions below?

Accepted Answer

PbO2

Question 3

What process is shown in the following diagram?

Accepted Answer

Fusion

Question 4

Which element has 5 valence electrons?

Accepted Answer

phosphorus

Question 5

Which of the following words has the same meaning as "period?"

Accepted Answer

row

Question 6

Name that Bond:

Accepted Answer

Pierce Brosnan

Question 7

What kind of nuclear process is happening in the following image?

Accepted Answer

Fission

Question 8

What charge would the atom in the picture below have after it becomes an ion?

Accepted Answer

+2

Question 9

According to the symbol below, how many neutrons does an atom of this element have?

Accepted Answer

18

Question 10

How many hydrogen atoms are needed on each side of the equation to balance it?

Accepted Answer

12

Question 11

Name that reaction:

Accepted Answer

synthesis

Question 12

Increasing the concentration of the reactants in a reaction ___ collisions between particles.

Accepted Answer

increases

Question 13

Name that reaction:

Accepted Answer

double replacement

Question 14

Which of the following is a benefit of using nuclear energy to generate electricity?

Accepted Answer

No greenhouse gasses released

Question 15

The red line on the graph shows the activation energy of a reaction needed with a(n) __ added .

Accepted Answer

catalyst

Question 16

Ions that have a positive charge are ___.

Accepted Answer

cations

Question 17

Name that bond: Na2O

Accepted Answer

ionic

Question 18

This image represents a(n) __ reaction.

Accepted Answer

endothermic

Question 19

How many oxygen atoms are needed on each side to balance the reaction?

Accepted Answer

4

Question 20

Which of the following would be a sign that chemical change is taking place?

Accepted Answer

color change

Question 21

Name that reaction:

Accepted Answer

decomposition

Question 22

Which of the following would increase the speed of a chemical reaction?

Accepted Answer

increasing the surface area

Question 23

Which elements on the periodic table in this image are yellow?

Accepted Answer

Metalloids

Question 24

___ properties of matter include density, boiling point, color and malleability.

Accepted Answer

Physical

Question 25

Increasing the temperature of a reaction ____ the collisions between reactant particles

Accepted Answer

increases

Question 26

Name that bond: Ag

Accepted Answer

metallic

Question 27

Name that bond: C2H6

Accepted Answer

covalent

Question 28

How does the energy of the products compare to the reactants in this image?

Accepted Answer

reactant energy is lower

Chemical Changes and Conservation of Mass

Questions 28

Chemical Changes and Conservation of Mass

Questions 28