HOMEWORK HELP

rainbowrocks • 12 December 2013 at 3:20 PM

Can someone help? Its 7 questions in science about chemical and physical changes and im in 5th grade:
Question 1



True or False:
A change in shape or phase of matter is a physical change.
Select one:
True
False
Question 2

True or False:
The properties of a substance do not change in a chemical
change.
Select one:
True
False
Question 3


True or False:
When some kinds of antacid tablets are added to water, the resulting fizz gives off oxygen gas.
Select one:
True
False
Question 4

True or False:
Atoms become rearranged in chemical changes.
Select one:
True
False
Question 5

True or False:
Atoms become rearranged in chemical changes.
Select one:
True
False
Question 7

Draw Conclusions: At 6 P.M., you see logs piled up for a campfire. Later you see flames and feel heat from it. At 8 P.M., only smoldering ashes remain.

What changes have taken place? How can you tell?

iv24 • 14 December 2013 at 2:48 AM

@rainbowrocks 1-true 2-false 3-I don't know, but I may be true 😃 4 and 5 are the same..true

wolphire • 14 December 2013 at 3:14 AM

@rainbowrocks

#7 is exothermic within enthalpy. Because the fire released heat, you know it's that process/chemical reaction.