Which one is a physical change;
-burning paper
-baking cookies
-toasting marshmallows
-dissolving salt
Dissolving salt
100
A(n) ____________________ is a group of two or more atoms that are held together by chemical bonds.
molecule
100
Is the melting of an ice cube a;
-physical change
-chemical change
physical change
100
What is the SI unit of mass?
kilogram
200
These hold atoms together in a molecule?
What are chemical bonds?
200
The ability to do work or cause change
energy
200
The fact that matter is not created or destroyed in any chemical or physical change is called the ______________________________.
law of conservation of mass
200
Which of the following is an example of a chemical property?
-density
-flammability
-hardness
-luster
flammability
200
Which of the following is a physical change?
-burning
-rusting
-freezing
-oxidation
freezing
300
Soil, a salad, and sugar water are all examples of...
What is mixtures
300
One example of a chemical change is:
-filtering a mixture
-burning wood
-boiling water
-crushing a can
Burning wood
300
A(n) ____________________ is formed when two or more substances are so evenly mixed that you can’t see the different parts.
homogeneous mixture
300
Which of the following is an element?
-water
-carbon dioxide
-oxygen
-ammonia
oxygen
300
A piece of metal has a volume of 38 centimeters cubed and a mass of 277 grams. Calculate the density of the metal.
7.3 grams per centimeter cubed
400
The volume of an irregular object can be measured by multiplying....
Length * width * height
400
Fireworks exploding in the sky and giving off light are an example of a(n)
-endothermic change
-exothermic change
-physical change
-change in mass
exothermic change
400
A volume of 25 milliliters is the same as a volume of ____________________ cubic centimeters.
25
400
The density of a substance is calculated by dividing...
its mass by its volume
400
The abilities to dissolve in water and to conduct electric current are examples of
-physical properties
-chemical properties
-physical changes
-chemical bonding
physical properties
500
Liquid water, ice, and water vapor are different ______ __ ______
States of matter
500
Hardness, texture, color, and freezing point are examples of ____________________ properties of matter.
physical
500
Which is more dense;
-liquid water
-ice
liquid water
500
Four methods that can be used to separate mixtures are...
distillation, evaporation, filtration, and magnetic attraction
500
What is the volume of a solid with a length of 3cm, a width of 5 cm, and height of 10 cm?