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Elements, Compounds And Mixtures
Test Description: Review of compounds, elements and mixtures.
Instructions: Answer all questions to get your test result.
1) A compound is a substance that can be broken down into simpler substances and is made from atoms of two or more elements. Which of the following is not a compound?
A
gold
B
carbon dioxide
C
glucose
D
table salt
2) Air contains about 78% nitrogen and 21% oxygen. What can you conclude from this fact?
A
air is a pure substance
B
air is a mixture of at least two gases
C
air consists of different states of matter
D
air consists of components that are chemically joined
3) A solution is a mixture where one substance is dissolved in another. One example of a solution is salt water. Why does salt water appear to be a single substance even though it contains more than one substance?
A
The particles in salt water are distributed evenly among each other.
B
Each component in salt water retains its original physical properties.
C
Salt water is a pure substance.
D
The components in salt water cannot be separated from each other.
4) Which of these common substances is a homogeneous mixture?
A
pure water
B
whole milk
C
table salt
D
maple syrup
5) What is true of all mixtures?
A
All mixtures are made up of compounds.
B
All mixtures are made up of colloids.
C
All mixtures are made up of elements.
D
All mixtures are made up of atoms.
6) A material being examined is the same throughout. The material contains carbon and oxygen, chemically combined. What type of material is it?
A
Compound
B
Heterogenous Mixture
C
Element
D
Homogenous Mixture
7) Water has the chemical formula H2O. How do the properties of hydrogen (H) and oxygen (O) change when they come together to form water?
A
They will both lose electrons when they become part of a water molecule
B
They both can become a gas once they combine to form a water molecule
C
They will no longer burn with they are part of a watermolecule
D
They gain the ability to become a liquid when they form a watermolecule
8) Which is true about each group of atoms that makes up a compound?
A
The groups are made of atoms that are physically combined
B
Each group is identical
C
Some groups are different sizes
D
Each group contains only one type of atom
9) Susie wants to make lemonade on a hot summer day. She mixes lemon juice, water, and sugar in a large container. Which of the following happens as she combines the ingredients?
A
The heavier items will not completely dissolve, creating a suspension
B
The stirring motion causes them to break down into elements
C
They mix together to form a new compound
D
They mix together to form a homogeneoussolution
10) What is it called when the particles in a mixture are dispersed within a liquid or gas and will settle out?
A
Colloid
B
Homogenous Mixture
C
Suspension
D
Solution
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