WorksheetsCompounds and Chemical Changes
Total questions: 25
Worksheet time: 13mins
What is an element?
The smallest form of matter.
A combination of atoms.
A creation of a chemical reaction.
A Nucleus
What is a compound?
A molecule made of combined elements.
A periodic element.
A metal
Made from just one element.
How many elements are in this formula. NaCl
1
2
3
4
How many elements are in this formula. H2O
1
2
3
4
How many elements are in this formula? CO2
1
2
3
4
What is the difference between a compound and an element.
Elements are made of 2 different parts and a compound is made of one.
Elements are made from parts of the periodic table and the Compounds are found on the periodic table.
Elements are found on the periodic table and compounds are made of different elements bonded together.
Elements are found on the periodic table, and compounds are found at the bottom of the table.
How many elements are in the formula. CH4
2
3
4
5
Which of these is a single element?
NaCl
H2
CO2
CO
What is the name(s) of the elements in the compound NH4 ?
Nitrogen, Hydrogen
Nitrogen, Helium
Ammonia
Sodium, Helium
How many elements are in this formula? CaCO3
2
3
4
5
Which of the following represents an element?
Cr
CaO
NaCl
CO
What is the chemical symbol for nitrogen?
Na
N
Ni
Ne
Which of the following list only chemical changes?
silver tarnishing, leaves changing color, water separating into hydrogen and oxygen
ice melting, sugar dissolving in water, paper tearing
glass breaking, breath condensing on a window, sanding wood
grinding chalk into a powder, mixing kool-aid into water, making a salad
Two liquids are mixed together. Which of the following is NOT a sign of a chemical reaction?
a gas is produced
the temperature changes
one liquid mixes with the other
a solid is formed
Which of the following is TRUE about compounds?
Made from just one element
found on the periodic table
not essential (important) for life
found on earth
Which of the following is TRUE about compounds?
formed through a chemical reaction
not found on earth
symbolized by one consonant letter
not essential (important) for life
Which of the following is TRUE about elements?
Made from just one element
Symbolized with more than one capital letter
not on the periodic table
not found on earth
True or False:
Both compounds and elements are essential for life and found on Earth.
True
False
During a class demonstration, your teacher placed a small amount of sugar in a spoon and held it over a flame. Which of the following is a sign that a chemical change occurred?
the sugar melted
the sugar grew larger
the sugar got hot
the sugar turned black
Which of the following elements was among the most common elements in the ocean, atmosphere, and in living things?
oxygen
sodium chloride
carbon
nitrogen
Which of the following is FALSE about an element?
Made from a mixture
It is a pure substance
It is represented by a symbol
They make up all matter on Earth
In a class demonstration, the teacher put several drops of a liquid into a beaker of another liquid. solid crystals began forming inside the beaker. Which explanation best describes what happened?
The dropper's liquid was super cold causing a solid to form.
It began to evaporate leaving behind a solid.
The two liquids reacted to form a new solid substance.
They did not mix because they had different properties.
During a lab, you put a spoon full of baking soda into a clear liquid. It began to fizz and bubble up and overflow the beaker. Which statement explains what happened?
No reaction took place.
a physical change occurred.
a chemical reaction created a solid substance.
a chemical reaction created a gas.
Which of the following is NOT a sign of a chemical change?
gas is formed
light is produced
it changes from dark blue to light blue when a clear liquid is added
a powdery substance forms when to liquids are combined.
Which one is NOT a sign of a chemical reaction?
Fireworks make bright light, sparks, and smoke.
A clear liquid is poured into milk and clumps form in the milk.
A spoonful of white crystals dissolve in a clear liquid.
A powder is added to a liquid. It fizzes and the temperature rises.
