WorksheetsIntro to Chemistry test review
Total questions: 40
Worksheet time: 1hrs 20mins
A salad is an example of a __________.
homogenous mixture
solution
heterogeneous mixture
homogenous solution
Which of the following is a solution?
lemonade
trail mix
legos
iron filings and sand
What is the definition of a solvent?
The substance that is dissolved.
The substance in which the solute is dissolved.
Unable to be dissolved.
Which tools are best for separating a mixtures of sand, iron filings, and water?
Hot plate and filter
Tweezers and filter
Filter and magnet
Magnet and hot plate
Is this an example of a physical or chemical change?
physical
chemical
Which of the following is NOT part of an atom?
Proton
Neutron
Positron
Electron
A sample of water has a mass of 193 g. Salt is added to the water, and the final solution weighs 238 g. How much salt was added?
138 g
45 g
431 g
Not enough information
When a log burns in a fire, _____.
A physical change has occurred
Mass is gained
Mass is lost
New substances are formed
_____ is another name for a homogeneous mixture.
Liquid
Solution
Substance
Suspension
The measurement of an object's mass is a _____.
Physical Change
Physical Property
Chemical Change
Chemical Property
When a newspaper is left in direct sunlight for a few days, the paper begins to turn yellow. The yellow color is evidence of a _____.
Physical Property
Chemical Property
Physical Change
Chemical Change
Solution A has a mass of _____ g. Solution B has a mass of 20 g. When they are mixed, the total mass is 120 g. Find the mass of Solution A.
60 g
180 g
100 g
Not enough information
A cup of orange juice weighs 200 g. Three cubes of ice weigh 20 g each. How much does the cup of orange juice weigh after the ice is added?
260 g
240 g
280 g
Not enough information
When atoms rearrange and bond into new substances, the process is called a _____.
chemical reaction
physical reaction
property
molecule
When two or more substances are combined so each substance can be separated by physical means, the result is a(n) _____.
solvent
solute
chemical reaction
mixture
The ability of a pond to freeze over in winter is a _____.
physical change
chemical change
physical property
chemical property
When a chunk of dry ice is at room temperature, a cloud of carbon dioxide vapor forms. The carbon dioxide is changing from a _____.
solid to a liquid which is a physical change
solid to a gas which is a physical change
solid to a gas which is a chemical change
liquid to a gas which is a chemical change
Which of the following is NOT a possible sign of a chemical change?
a change in state
a change in color
the release of a gas
the release of energy
When thermal energy is added to a liquid
particles move slower and temperature decreases
particles move faster and temperature increases
particles move slower and temperature increases
evaporation occurs
Which statement best describes the information in this graph?
As temperature increases matter becomes more solid
As temperature decreases mass evaporates
As temperature decreases matter will not change
As temperature increases matter becomes less solid
CO + H2O --> CO2+ H2
Which substance represented in the equation above is classified as an element?
H2
H2O
CO
CO2
If each type of sphere represents a different atom, which statement best describes this model?
This is a model of a single element
This model shows how molecules of ice are arranged in an ice cube
This is a model of a compound containing 2 types of atoms
This model is an example of hydrogen gas
Why are both of these models considered elements, instead of compounds?
Both show moving particles
Neither can be broken down into any other substance
Only one contains two atoms in the molecule
Both can be easily separated
Using the information provided about the element Mercury in the periodic table, how many protons does a mercury atom contain?
(a)
Which size-independent property does not change from beaker A to beaker B?
density
boiling point
chemical composition
mass
If one decided to mix sugar into water to make sugar water, the water could be left out to evaporate and the sugar crystals would remain. However, if one made a recipe for a cake with flour, water, sugar and other ingredients and baked them together, it would take extraordinary means to separate the various ingredients out to their original form. Using these examples, sugar water is a _______, and the cake is a ______.
chemical change, physical change
physical change, physical change
chemical change, chemical change
physical change, chemical change
Chex Mix is an example of a(n)
element
chemical reaction
heterogeneous mixture
homogeneous mixture
How does this figure show the conservation of mass?
The mass of solid A and the mass of liquid B combine to equal the mass of mixture C.
Solid A is shown to react with liquid B to form a new substance C.
Solid A and liquid B show only a color change
A chemical reaction occurs when solid A dissolves in liquid B
In the article below, which sentence best illustrates conservation of mass?
Our town library dealt with a terrible fire in one of its rooms over the weekend. The room contained much-loved books and magazines. Firefighters rushed to the scene, but were too late. All that remained of the books and magazines were ash, water vapor, and carbon dioxide fumes. The mayor arrived soon afterward and urged everyone to donate to help rebuild this important community building.
The mayor arrived soon afterward and urged everyone to donate to help rebuild this important community building.
The room contained much-loved books and magazines.
All that remained of the books and magazines were ash, water vapor, and carbon dioxide fumes.
Our town library dealt with a terrible fire in one of its rooms over the weekend.
Chiara knows that weight is affected by gravitational pull. She is putting together a poster to display in her classroom.
Since the moon's gravity is less than Earth's, all objects, including mammals, have different weights on the moon than on Earth. Use the table below to calculate how much a dog weighs on the moon.
25 lbs
35 lbs
40 lbs
45 lbs
Annie learns that the compound sulfuric acid is called the universal chemical. The acid is used in everything from gasoline to paper. Annie uses beads in three different colors to model sulfuric acid. Based on the model, what is the chemical formula of sulfuric acid?
H2SO4
O2H4S
S4O2H
S2HO4
Jonah and Rachel volunteer at the recycling center sorting and organizing recyclable objects. Jonah is sorting aluminum cans and crushing the cans to fit more in the bag. Rachel is sorting metal and steel objects into appropriate bins.
Jonah realizes that even though he is crushing the cans, the amount of material in each can is unchanged. Which of the following describes the process that is taking place?
a change in chemical bonds within the object
a change in matter that produces one or more new substances
a change in mass of an object
a change in form or appearance of matter
Liz is exploring the different kinds of changes that can happen to substances.
She knows that changes can alter the looks or shape of a substance. Cutting, melting, bending, or crushing are examples of what kind of change?
reactant
product
physical
chemical
Kim understands that there are several signs that indicate a chemical reaction has occurred. What is the best way to be certain that a chemical reaction has occurred?
Some bubbles form.
A color change occurs.
The materials do not react.
A new substance forms.
Lauren makes an art piece using the densities of various liquids to create layers of colors. She first determines the density of each liquid. Then she pours them into a glass container and watches them separate into layers.
Liquid: Density
Dish Soap: 1.03 g/ml
Honey: 1.36 g/ml
Corn Syrup: 1.33 g/ml
Corn Oil: 0.91 g/ml
Water: 1.00 g/ml
Lauren wants to add in the additional layers shown in the table below. Assuming all layers will have a volume of 3 mL, which of all the substances will float on top?
Liquid: Mass
Rubbing Alcohol: 2.40
Milk: 3.12
Honey
Rubbing Alcohol
Corn Oil
Milk
