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WorksheetsElements/ Compounds and Property Changes Review
Total questions: 50
Worksheet time: 25mins
What is a pure substance that cannot be separated into simpler substances by physical or chemical means?
elements
compounds
homogeneous mixture
heterogenous mixture
What is matter that is composed of two or more different types of atoms that are chemically combined?
elements
compounds
homogeneous mixture
heterogenous mixture
What is matter that is made up of the same particles throughout?
elements
compounds
mixture
elements and compounds
What is the symbol that represents each element on the periodic table?
chemical formula
chemical symbol
atomic number
atomic mass
What is made of carbon bonded to other elements, such as hydrogen, oxygen, and nitrogen?
living matter
oceans
atomsphere
Earth's crust
What is made of oxygen, silicon, aluminum, iron, and calcium?
living matter
oceans
atomsphere
Earth's crust
What is made of hydrogen, oxygen, sodium, and chlorine?
living matter
oceans
atomsphere
Earth's crust
What is a mixture of mainly nitrogen and oxygen?
living matter
oceans
atomsphere
Earth's crust
What is a process by which one or more substances change to produce one or more different substances?
physical change
chemical change
What is shorthand notation using letters and numbers as subscripts for elements found in compounds?
chemical formula
chemical symbol
What is a process by which one or more substances change in appearance but maintains its identity?
physical change
chemical change
What element can be found in the atmosphere, oceans, Earth's crust, and living matter?
carbon
oxygen
hydrogen
nitrogen
True or false? A limited number of elements make up most of the Earth's crust, ocean, atmosphere, and living matter?
true
false
What elements is the atmosphere mostly made up of?
oxygen
nitrogen
carbon dioxide
water
Which element is most abundant in Earth’s crust?
oxygen
silicon
aluminum
iron
What element is the Earth's oceans mostly made up of?
oxygen
hydrogen
sodium
chlorine
What element is living matter mostly made up of?
oxygen
carbon
hydrogen
nitrogen
An element is composed of one type of _____.
compound
molecule
atom
substance
What shorthand notation is used for elements?
chemical symbol
chemical formula
atomic number
atomic mass
What shorthand notation is used for compounds?
chemical symbol
chemical formula
atomic number
atomic mass
Which of the following chemical symbols best represents an element?
CO
He
LiF
H₂O
Which of the following is a characteristic of elements?
They are always poisonous gases.
They cannot be divided into simpler substances.
They are always shiny metals.
They break down when reacting with acids.
Which of the following represents a compound?
Ca
Co
CO
Cu
Which model best represents a compound?
The elements sodium and chlorine are both deadly poisons. Table salt (NaCl), which contains both of these elements, is safe to eat. How is this possible?
All elements are poisonous in their pure forms.
When elements form compounds, their properties change.
The acid in the stomach counteracts the sodium and chlorine.
Sodium and chlorine are dangerous only if inhaled when they are gases.
Evidence of a chemical change includes ________________.
production of a gas
a precipitate
an unexpected temperature change
an unexpected color change
all of the options
Which of the following is an example of a chemical change?
braiding hair
chewing gum
moldy bread
flat tire
Cracking an egg, mixing salad, and shredding cheese are all __________________.
physical changes
chemical changes
Crushing a can is an example of a ____________________.
physical change
chemical change
Roasting marshmallows over a campfire is an example of a ____________________.
physical change
chemical change
True or false? You have a cold drink. The air touching the outside of the drink turns into liquid. It is a physical change.
true
false
When writing a symbol for an element, which rule is important to remember?
There are always two letters.
The first letter is always capitalized.
All letters are always capitalized.
There is always a period.
Which of the following is an element?
water
air
steel
oxygen
An element is —
a pure substance
a combination of substances
a mixture of substances
a metal substance
Which circle graph best represents the elements in sea water?
Piper saw the letter S on a container in the science lab. Which element was MOST likely found in the
container?
sodium
sulfur
selenium
sand
Evelyn read a book about a scientist who turned lead into gold. Her friend Justin told her that it is not possible to turn lead into gold because _____.
it is not possible to get the lead hot enough using typical lab equipment
the ingredient needed to turn lead into gold is very hard to find on Earth
the lead used by the scientist was mixed with another metal
elements cannot be changed into another element by physical or chemical changes
Which of the following best represents an element?
Si
NaCl
H2O
CO2
Which of the following pictures best represents an element?
Use the information in this table to answer the question. Which substance showed no chemical change?
hydrogen
sodium
argon
carbon
Two students mix vinegar and baking soda. They observe bubbles forming, the baking soda dissolving, and the vinegar turning cloudy. They infer that a chemical change has occurred because _____.
They observed gas bubbles forming.
The baking soda dissolved.
The vinegar turned cloudy.
During a chemical reaction, sometimes a solid is formed from a liquid. What is the solid called?
bubbles
rust
mold
precipitate
Yeast, soap, and hydrogen peroxide are combined causing an exothermic chemical reaction. What is an exothermic chemical reaction?
The temperature is increased because heat is produced.
The temperature is decreased because heat is taken away.
The temperature remains the same because the yeast, soap, and hydrogen peroxide are the same temperature.
True or False? Chemical changes are quick and easily noticed.
true
false
As part of an experiment, students put baking soda and vinegar into a bottle with a balloon at the opening. Then, they lightly swirl the bottle to mix the substances together. The balloon starts to inflate. Why does the balloon start to inflate?
It produces a gas.
The temperature increases.
The color changes.
It formed a precipitate.
A teacher does a demonstration with milk, water, and citric acid. She combines the two liquids and the white powder, and stirs them over the hot plate. The students notice a white solid substance forms in the beaker. What is the evidence that a chemical change occurred?
The mixture was white.
A precipitate formed in the mixture.
A chemical change changed the temperature of the mixture.
A chemical change produced a gas.
During an experiment, a teacher places a sugar in a spoon and heats it up over a flame. What would be the best evidence that a chemical change has occurred?
The sugar's temperature increases.
The sugar expands.
The sugar melts into a liquid.
The sugar turns brown.
Which of the following statements about changes is true?
Cracking an egg and cutting hair are physical changes. Leaves turning red and rotting food are chemical changes.
Cracking an egg and cutting hair are chemical changes. Leaves turning red and rotting food are physical changes.
Leaves turning red, rotting food, and cracking an egg are chemical changes. Cutting hair is a physical change.
Cracking an egg, leaves turning red, and cutting hair are physical changes. Rotting food is a chemical change.
Which of the following is an example of a chemical change?
filling up a balloon with hot air
taking a glass of water and freezing it by placing it in the freezer
a plant collecting sunlight and turning it into food
your dog ripping up your homework
What characteristic best describes what happens during a physical change?
The appearance stays the same.
The chemical composition changes.
Mass is lost.
The chemical composition stays the same.
