Which of the following are pure substances?
solutions , compounds, homogeneous mixtures, colloids
What are coumpounds
100
Water is a compound because it
What is alwyas has two hydrogen atoms for each oxygen atom and can be broken down into simpler substances (the elements H and O)
100
Flammability is a material’s ability to burn in the presence of
What is oxygen
100
A substance has a melting point of 0ºC and a boiling point of 100ºC. The substance is most likely
What is water
100
Which of the following has the highest viscosity?
corn syrup, water, milk, or orange juice
What is corn syrup
200
You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” The soy milk is most likely a
What is suspension
200
An element has a fixed composition because it contains only one type of ____________________.
What is an atom
200
A solid that forms and separates from a liquid mixture is a(an)
What is precipitate
200
A material that is malleable and conducts electricity is most likely
wood, metal, ice, or motor oil
What is metal
200
Which of the following is malleable?
glass, ice, pottery, or gold
What is gold
300
If an unknown substance CANNOT be broken down into simpler substances, it is
What is an element/made up of one type of atom
300
____________________ properties can be observed only when the substances in a sample of matter are changing into different substances.
What is chemical
300
What is NOT a clue that a chemical change has occurred?
What is change in shape
300
What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?
What is distillation
300
A mixture can be classified as a solution, suspension, or colloid based on the
What is size of its largest particles.
400
A substance that is made up of only one kind of atom is a(an)
What is element
400
During which of the following chemical changes does a precipitate form?
What is adding lemon juice to milk
400
A substance that has high reactivity
What is easily combines chemically with other substances.
400
When a physical change in a sample occurs, which of the following does NOT change?
What is composition
400
If a material contains three elements joined in a fixed proportion, it is a(an)
What is a compound
500
What is the symbol for aluminum?
What is Al
500
What is an example of a heterogeneous mixture?
What is mixed nuts
500
The symbol for gold is
What is Au
500
Which of the following materials is useful for making molds because it has a low melting point?
wood , clay, metal, or wax
What is wax
500
Which of the following is a physical change?
a. sawing a piece of wood in half
b. burning a piece of wood
c. rust forming on an iron fence
d. a copper roof changing color from red to green