Science Questions

Change in properties and a change in property is a sign that a chemical chanve has occured

If you detect a change in the color of a material, why does this indicate that a chemical reaction might've occured

Chemical reaction

Suppose you mix two clear liquids together to form a new substance, and bubbles form. What type of reaction might this indicate?

bonds break, new bonds form, and new substances form

What happens to the bonds between atoms when chemical changes occur?

anything that has mass and takes up space

What is matter?

precipitate

a solid that forms during a chemical reaction is called a(n)

exothermic reaction

burning wood is an example of what?

endothermic reaction

frying an egg is an example of what?

false

is it true or false? Endothermic reactions always result in a decrease in temperature.

true

is it true or false? a change in energy always occurs during a chemical reaction.

false

is it true or false? a physical change never alters the form or apperance of a substance

formation of a new substance and changes in energy

list two of the main kinds of changes that you can observe when chemical reactions occur

a characteristic of a substance that can be observed without changing the substance into another substance

what are the physical properties of matter?

formation of new substances and changes in energy

what is the evidence for chemical reactions?

reflects change in energy

why does change in temperature indicate that a chemical reaction may have occured?