Ch 1 & 2 practice q's and info

Question 1

A scientific _________ offers a scientific explanation about why something happens and is supported by a large number of experiments

Answer 1

theory

Question 2

__________ produce evidence that helps answer important questions or leads to new questions

Answer 2

Investigation

Question 3

Which form of the substance has the largest volume and why?
a. liquid: takes the shape of the container
b. none: all have the same volume
c. solid: has the hardest surface
d. gas: expands to fill the container

Answer 3

d. gas: expands to fill container

Question 4

Which of the following is not a sign that a chemical change has occurred?
a. release of bubbles
b. melting
c. production of light
d. color change

Answer 4

b. melting

Question 5

True or False
a change in size or shape is a physical change.

Answer 5

TRUE

Question 6

True or False
A chemical change means a new substance with new properties found

Answer 6

TRUE

Question 7

True or False
An example of a chemical change is when water freezes

Answer 7

FALSE

Question 8

True or False
when platinum is heated, then cooled to its original state, we say this is a physical change

Answer 8

TRUE

Question 9

True or False
when milk turns sour, this si a physical change because a change in odor does not indicate a chemical change

Answer 9

TRUE

Question 10

True or False
When citric acid and baking soda mix, carbon dioxide is produced and temp decreases. This is a chemical change.

Answer 10

TRUE

Question 11

As temp increases, density generally _______

Answer 11

decreases

Question 12

The density of an object relies on both the _______ and ________ of the object
a. volume and mass
b. volume and color
c. mass and color
d. volume and shape

Answer 12

a. volume and mass