What is the ability of a solid to be hammered without shattering.
100
When can Chemical properties be observed.
What is only when the substances in a sample of matter are changing into different substances.
100
Why would you expect the material used to make pot holders to be poor conductors of heat?
What is the pot holders are designed to prevent the transfer of heat.
100
One of the general safety instructions for working in a laboratory is to tie back long hair, especially when using a lab burner. From this instruction, what can you infer about the flammability of hair?
What is hair is flammable
200
____ is made up of only one kind of atom.
What is an Element
200
Resistance to flowing
What is Viscosity
200
A substance that has a high reactivity can...
What is easily combines chemically with other substances
200
Fresh milk is a suspension. After fresh milk is homogenized, it's a colloid. What happens to the size of the drops of fat in milk when milk is homogenized?
What is the size of the drops of fat are broken down into smaller drops, which can remain dispersed throughout the milk.
200
Explain why painting an iron railing can slow down the rate at which the railing rusts.
What is the paint prevents the iron from coming in contact with oxygen and water. If the paint flakes off, the iron will start to rust.
300
A material containing three elements joined in a fixed proportion.
What is a compound.
300
Used to test the purity of an object
What is Density
300
Three common types of evidence for a chemical change are
What is change in color, production of gas, and the formation of a precipitate.
300
How does the composition of a mixture of hydrogen & oxygen differ from the composition of a compound containing hydrogen and oxygen
What is a mixture can vary whereas compound cannot
300
Explain the chemical change that occurs when you bake a cake
What is the production of gas from heating the baking powder cause tiny bubbles of gas making the cake light & fluffy, the heating of the protein in the eggs changes and make the cake firm, oil keeps the cake from drying out.
400
A mixture can be classified as ______, _____ ,or _____ based on the size of its largest particles.
What is solution, suspension, or colloids
400
Melting point and boiling point of water?
What is 0 degrees Celsius & 100 degrees Celsius
400
Butter melts and then burns in a hot pan. Which of these changes is a physical and which is chemical?
pWhat is melting = Physical and burning = Chemical
400
Compare the properties of a raw egg to those of a hard boiled egg.
What is raw egg is a liquid. The egg white is cloudy and the yolk is orange. The hard boiled egg is a soft solid and the egg white is not transparent and the yolk is yellow.
400
How could you use the density of a gold bracelet to show that a gold bracelet contains elements other than gold
What is you could measure the density of the bracelet and compare that value to the known density of pure gold.
500
1. _________ is a mixture with parts evenly distributed throughout.
2. _________ is a mixture with noticeably different parts.
1. What is Homogeneous, 2. What is Heterogenous
500
Name & Describe two ways mixtures can be seperated
What is Filtration. It is the process that separates materials based on the size of their particles.
What is Distillation. It is the process that separates the substances in a solution based on their boiling points.
500
How does Chemical changes differ from Physical change?
What is a chemical change produces new substances and a physical change produces no new substances.
500
Sap from a maple tree is about 97% water & about 3% sugar. Maple syrup is about 34% water & 66 % sugar. Which would have the greatest viscosity? Explain why.
What is syrup has the greater viscosity because it contains much less water, which has a low viscosity.
500
What information would you need to know about a sample of air before you could classify it as a solution, suspension, or colloid?
What is what is in the air? is the air dusty? is there water droplets in the air?