Substances mixed

Question 1

the process by which one substance is completely mixed with another substance

Answer 1

dissolving

Question 2

a combination of two or more substances that keep their properties when they are mixed

Answer 2

mixture

Question 3

a change in matter that occurs when heating or mixing substances produces a new substance

Answer 3

chemical reactions

Question 4

to determine if a new substance is formed, we look for changes in the ____________.

Answer 4

properties

Question 5

We always record properties of each substance before we mix them so we can tell if there is a change after we mix them. Different properties _________ indicate that a new substance was formed.

Answer 5

could

Question 6

When matter changes state (solid, liquid, gas) as the result of _______ or _______, or seems to disappear when it is dissolved, it is still the same substance.

Answer 6

heating or cooling

Question 7

In a ________, substances keep their properties, and no new substance is formed.

Answer 7

mixture

Question 8

Not all dissolving substances can be separated by boiling one of the substances away. A mixture of ________ and ________ will burn resulting in a new substance.

Answer 8

sugar and water

Question 9

When we mix 2 substances, we need to wait at least _____ seconds before recording the properties of the mixture to allow time for a reaction to take place.

Answer 9

30

Question 10

It is important to do more than 1 trial in an investigation to make sure we get _________ results.

Answer 10

consistent

Question 11

Indicators of substance formation

Answer 11

• unexpected color
• odor change
• gas formation
• solid formation
• weight change (due to gas formation)

Question 12

Mixing baking soda and vinegar produces a ______ reaction while mixing salt and water does not.

Answer 12

chemical

Question 13

In situations where substances are heated, cooled or mixed the _________ of the substances does not change, even when a new substance is formed.

Answer 13

total weight

Question 14

__________ and _________ substances can lead to the formation of new substances that can be identified by their new properties.

Answer 14

heating and mixing

Question 15

When substances are heated, cooled or mixed, the ______ of the substances does not change, even when a new substance if formed. (Remember the investigation with vinegar and baking soda in the sealed bag)

Answer 15

total weight

Question 16

When a metal like iron is exposed to air and moisture, a chemical reaction called ___________ occurs. This creates a reddish brown coating called _____, which eventually weakens and destroys the iron.

Answer 16

oxidation

rust

Question 17

______ also oxidizes, but instead of rust, a pale green coating forms. The coating actually protects the ______.

Answer 17

copper