What tools were needed to calculate density in your lab?
100
A one or two letter abbreviation for an element
What is a chemical symbol?
100
Liquid butane gets lit on fire and carbon dioxide and water are produced.
What is an example of a chemical change?
100
Molecules move away from each other and then move close to each other.
What happens when you heat a substance and then cool it down?
200
A substance from your lab that is less dense than metal.
What is wood?
200
An abbreviation of a compound that tells you the kind and number of atoms in a molecule
What is a chemical formula?
200
Changes that produce new substances (arrangement of atoms in molecules change). Bonds that hold atoms together are broken or new bonds between molecules form.
What is a chemical change? (Give an example)
200
Many solids expand when heated and contract when cooled. (Hint: why question)
Why do roads crack?
300
The formula for calculating density
What is mass/volume?
300
The symbols to the left of the arrow in a chemical equation
What are reactants?
300
Changes that do not produce new substances (molecules are the same). Changes in size or shape or changes between solid, liquid and gas stages.
What is a physical change? (Give an example)
300
Something that is used in construction to keep streets, pathways and pipes from cracking.
What is an expansion joint?
400
Length X height X width
What is the formula for calculating volume?
400
The symbols to the right of the arrow in a chemical equation.
What are products?
400
Liquid butane (in a lighter) becomes gaseous butane
What is an example of a physical change?
400
Liquid water is more dense than ice because the molecules in ice line up and create space between themselves.
Why does ice float? or What is the "special case" of ice?
500
Mass per unit volume (e.g. grams/centimeter cubed)
What is density?
500
The chemical equation for the formation of water
What is H2 + O2 > H2O?
500
Matter is not created or destroyed. For both chemical and physical changes the same number of atoms remain.
What is conservation of matter?
500
If volume increases and mass stays the same, density increases. When temperature is increased, density decreases. (Hint: answer has to do with balloons)