Grade 8 NATURAL SCIENCE Term 2 Revision Questions with Verified Answers |
Guaranteed Success
Elements (can/cannot) be changed. cannot
Identify three parts of an atom: Electrons
Protons
Neutrons
_________ is the process by which plants make their own
food using carbon dioxide, water, and sunlight. photosynthesis
The more protons, neutrons and electrons an atom has, the (lighter/heavier) it will be.
heavier
TRUE or FALSE
Atoms are neutral because the number of electrons are equal to the number of protons.
true
The reason we have air to breathe is because plants release
_______ during photosynthesis. oxygen
What is the full name of the lightest element? hydrogen
TRUE or FALSE
Pure substances are made of multiple different atoms or molecules. false
Name the 4 ingredients in Photosynthesis. 1. Carbon dioxide
, 2. Sunlight
3. Water
4. Glucose
Physical changes such as melting, boiling, strength and flexibility do not change the identity of a
(impure/pure) substance. pure
Biotic factors are all the ______ organisms present in the
ecosystem. living
Elements are (impure/pure) substances as they consist of atoms of only one kind. pure
What are diatomic particles? Made up of two molecules
Abiotic factors from the ________ part of the ecosystem. non-living
Atoms in a given compound are always combined in a (non-fixed/fixed) ratio. fixed
Compounds can only be separated by ______. chemical reaction
TRUE or FALSE
The marula tree is indigenous to south Africa. true
What is electrolysis? A chemical decomposition produced by passing an electric current
through a liquid or solution containing ions
Guaranteed Success
Elements (can/cannot) be changed. cannot
Identify three parts of an atom: Electrons
Protons
Neutrons
_________ is the process by which plants make their own
food using carbon dioxide, water, and sunlight. photosynthesis
The more protons, neutrons and electrons an atom has, the (lighter/heavier) it will be.
heavier
TRUE or FALSE
Atoms are neutral because the number of electrons are equal to the number of protons.
true
The reason we have air to breathe is because plants release
_______ during photosynthesis. oxygen
What is the full name of the lightest element? hydrogen
TRUE or FALSE
Pure substances are made of multiple different atoms or molecules. false
Name the 4 ingredients in Photosynthesis. 1. Carbon dioxide
, 2. Sunlight
3. Water
4. Glucose
Physical changes such as melting, boiling, strength and flexibility do not change the identity of a
(impure/pure) substance. pure
Biotic factors are all the ______ organisms present in the
ecosystem. living
Elements are (impure/pure) substances as they consist of atoms of only one kind. pure
What are diatomic particles? Made up of two molecules
Abiotic factors from the ________ part of the ecosystem. non-living
Atoms in a given compound are always combined in a (non-fixed/fixed) ratio. fixed
Compounds can only be separated by ______. chemical reaction
TRUE or FALSE
The marula tree is indigenous to south Africa. true
What is electrolysis? A chemical decomposition produced by passing an electric current
through a liquid or solution containing ions
