one two, what's in the stew?
If mass changes during a reaction, what do we know about the reaction?
matter came or went somewhere - mass never changes in a reaction though
A white powder is dissolved in a liquid and undergoes a physical change. If the liquid is boiled away, what physical and chemical properties will the crystals that are left behind have?
the same ones that they had before (physical changes DON'T change chemical properties of the original substance)
Can a physical change be reversed?
usually, but not always easily
Anything that has mass and takes up space
What is matter?
a change in state, like an ice cube melting from solid to liquid, is a ___________ change
physical!
What is chemical Change?
a solid forms when two liquids mix. this is an example of a ___________ change
chemical
the carbon atoms in carbon dioxide are the same as atoms the carbon atoms in a diamond
YUP!
a change in temperature results from some __________ changes
chemical
in any chemical reaction, the number of atoms stays the same
true!
The amount of space an object takes up
What is volume?
TRUE or FALSE:
A powder can mix into a liquid completely. Later, the liquid is dried off and the powder remains in crystal form. This is a physical change
TRUE!
NO !
Can a chemical change easily be reversed?
No
What is an example of a chemical change?
An apple turning brown, rust, burning something, tarnishing, etc.
What happens to the amount of matter during a chemical reaction?
nothing - it stays the same!
when two materials react, causing a gas to be released, a _________ change has occurred
chemical
What are two chemical properties?
flammability, reactivity, toxic/poison, radioactive, explosive, corrosive
Wadding up a piece of paper is
What is a Physical Change?
cracking eggs and mixing them in a bowl is a...
Physical change
This happens when you turn up the heat to a certain point on a solid.
What is melting?