Changes
Energy
Matter
Measuring
Classifying
100
Is breaking a pencil a physical or chemical change?
What is physical change
100
A reaction where the temperature increases and energy is released is called a _________________ reaction
Exothermic
100
What state of matter has a definite shape and volume?
Solid
100
What is the formula for density?
mass/volume
100
A substance that cannot be broken down into any other substance is called a(n) _________________.
Element
200
Why is melting ice a physical change?
It is a change in state (from solid to liquid) but still water
200
A reaction that absorbs energy, causing the temperature to decrease is a _____________ reaction
Endothermic
200
Matter is anything that has ___________ and takes up _________
mass;space
200
What is the SI (international system of units) unit of mass?
Kilogram
200
The force of attraction between two atoms is called a(n) ____________________
chemical bond
300
What type of change happens when you mix baking soda and vinegar
A chemical change: carbon dioxide gas is formed
300
The energy stored in the bonds between atoms
Chemical energy
300
We describe matter using two types of properties
Chemical and physical
300
Density is a _________________ property. You can use it to help identify a substance or compound!
Physical
300
C6H12O6 is the ________________ for glucose
Chemical formula
400
In chemical and physical changes, matter is not created or destroyed. This law is called...
The law of conservation of mass
400
The total energy of motion of all of the particles in an object
Thermal energy
400
The building blocks of matter are called
Atoms
400
What is the density of water?
1 g/cm3
400
The ratio of carbon to hydrogen atoms in glucose (C6H12O6) is....
1 to 2
500
If I dissolve a packet of powdered juice in water, is it a physical or chemical change?
Physical - they are not chemically bonded, just dissolved into a solution (change in appearance, not chemical properties)
500
What happens to energy during a chemical change?
It is conserved. It just transforms from one type of energy to another, like from chemical to thermal.
500
What do we call the study of matter and how it changes?
Chemistry (not physics!)
500
I have a piece or iron with a density of 8g/cm3. If I melt it down into 4 equal parts, what is the density of each part?
8g/cm3
500
What is the difference between a compound and a mixture?
Compounds are chemically bonded, mixtures are not
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