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WorksheetsGeib test review Oct. 2020
Total questions: 28
Worksheet time: 9mins
Which condition must be met in order for an equation to be balanced?
The elements in the reactants are the same as the products.
There are fewer elements in the reactants.
There are greater elements in the reactants.
The number of atoms in the reactants equals the number of atoms in the products.
Hydrochloric acid and sodium hydroxide can be combined to form sodium chloride and water. Which best explains the reaction?
The total mass of the reactants will result in the same total mass of the product.
The mass of the reactants will be greater than the product.
The mass of the products will be greater than the reactants.
What symbol in a chemical reaction separates the reactants from the products?
=
an arrow points to the product
+
In 4NaCl, what does the 4 represent?
There are 4 molecules of NaCl.
There are 4 atoms.
There are 4 elements.
Which best describes a mixture?
It is not a pure substance.
It is a pure substance.
Which property describes a mixture?
It cannot be separated by physical methods.
It has a single chemical composition.
It cannot have more than one state of matter.
It cannot be described by a chemical symbol or formula.
Which is balanced?
Mg + 2O2 arrow 4MgO
2Mg + 2O2 arrow 2MgO
2Mg + O2 arrow 2MgO
Homogeneous mixtures...
A solute dissolves in a solvent to make a solution.
A solution dissolves in a solvent to make a solute.
Suppose a substance in a beaker is heated over a burner in a science lab. What observation would most likely indicate that a chemical change has occurred?
As it is heated, it gets hotter.
As it is heated, it goes from solid to liquid.
As it it heated, it produces a new odor.
Baking soda mixed into vinegar produces bubbles. This is an example of...
a change of state
a chemical change
a change in mass
Which describes a feature of the physical properties of all substances.
The identity of the atoms never changes.
All can dissolve in water.
All can conduct heat and electricity.
Which would show an example of how physical changes are reversible?
melting gold and then cooling it into a mold
burning a match and then relighting it
cutting a gold bar into 2 pieces and then putting them next to each other
Cutting a substance into 4 pieces is a
physical change
chemical change
When a gas becomes a solid, like frost, what is the the process called?
deposition
evaporation
sublimation
During which change of state do atoms lose energy?
melting
freezing
boiling
In which phase of matter are the atoms closely packed but still able to slide past each other?
solid
liquid
gas
What are the atoms in a solid doing?
moving very fast all around a container
vibrating in position
sliding past each other
No definite shape, no definite volume.
solid
liquid
gas
No definite shape. Definite volume.
solid
liquid
gas
Definite shape. Definite volume.
solid
liquid
gas
If the pressure of a substance increases, what happens to the temperature of the substance?
It decreases.
It increases.
It stays the same.
NaCl is
a compound
a molecule
salt
a mixture
salt water is
a pure substance
a mixture of salt and water
Milk is what kind of a mixture?
homogeneous
heterogeneous
Trail Mix or Chex Mix are what kind of mixtures?
homogeneous
heterogeneous
CaCO3
There are 3 oxygen atoms.
There are 3 carbon atoms.
There are 3 calcium atoms.
Ca3P2
There are 6 total atoms.
There are 5 total atoms.
There are 5 molecules.
NaOH
There are 4 atoms.
There are 3 atoms.
There are 4 moleucles.
There are 3 molecules.
