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WorksheetsG9: Subatomic Particles and Chemical Changes Pre-knowledge
Total questions: 16
Worksheet time: 5mins
Which of the following elements has an atomic number of 6?
Oxygen
Carbon
Nitrogen
Hydrogen
Which subatomic particle has no charge?
Proton
Electron
Neutron
Positron
What is the charge of a proton?
Negative
Positive
Neutral
Variable
What happens during a chemical change?
The substance retains its original properties.
The substance changes into a different substance.
The mass of the substance remains constant.
The temperature of the substance does not change.
What is the charge of an electron?
Positive
Negative
Neutral
Zero
What distinguishes a compound from a mixture?
Compounds are made of two or more different elements chemically bonded.
Compounds can be separated by physical means.
Compounds have variable composition.
Compounds are made of 2 or more atoms, which can be the same or different.
Which of the following is a molecule?
O
H2
Na
Cl
Which of the following is a sign of a chemical change?
Change in state
Change in shape
Production of gas
Dissolving in water
What is the atomic number of an element?
The number of neutrons in the nucleus.
The number of protons in the nucleus.
The total number of electrons.
The total number of protons and neutrons.
What is the charge of a neutron?
Positive
Negative
Neutral
Variable
Which of the following is NOT a sign of a chemical change?
Color change
Temperature change
Formation of a precipitate
Change in size
Which of the following represents a physical change?
Rusting of iron
Burning wood
Melting ice
Baking a cake
How many hydrogen atoms are in the compound C3H8 (propane)?
3
8
11
6
What is the difference between an atom and a molecule?
Atoms are larger than molecules.
Molecules are made of two or more atoms bonded together.
Atoms can exist independently, while molecules cannot.
Molecules have a fixed mass, while atoms do not.
How many atoms (in total) are in the compound C6H12O6 (glucose)?
24
18
6
12
Find Magnesium (Mg) on your periodic table and select the true statement below.
Protons = 24
Neutrons = 12
Atomic Mass = 36
Protons = 12
Neutrons = 24
Protons = 12
Neutrons = 12
Atomic Mass = 24
Protons = 12
Neutrons = 12
Atomic Mass = 26
