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9 Science - Term 3 Revision Flashcards | StudBud
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9 Science - Term 3 Revision
9 Science - Term 3 Revision
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1
Which of the following statements best describes an element?
A substance that is composed of atoms of the same type.
A substance that cannot be broken down into simpler substances
A substance made up of 2 or more different types of atoms combined
A substance that has a definite shape and volume
2
Which of the following is a chemical equation for the reaction between hydrogen gas and oxygen gas to form water?
H2 + O2 → H2O + O2
H2O → H2 + O2
H2 + O2 → H2O
H2O + O2 → H2
3
Which of the following is a potential positive effect of radiation in cancer treatment?
Destruction of healthy cells
Weakening of the immune system
Targeted destruction of cancer cells
Increased risk of secondary tumors
4
Which of the following statements about Gamma Decay is correct?
An electron is emitted from the nucleus.
A proton is emitted from the nucleus.
A neutron is emitted from the nucleus.
A wave of energy is emitted from the nucleus.
5
Which of the following subatomic particles has no charge?
Nucleus
Neutron
Proton
Electron
6
Which of the following is NOT a sign that a chemical reaction is occurring?
Change in temperature
Change in shape
Formation of a gas
Change in colour
7
Which of the following is an example of a compound?
NaCl
Au
O2
He
8
Which scientist discovered the electron?
John Dalton
Ernest Rutherford
JJ Thomson
Marie Curie
9
Which of the following is an example of nuclear decay?
Formation of water
Radioactive decay of uranium
Burning Wood
Rusting of iron
10
Which element has the symbol S?
Strontium
Scandium
Sulfur
Silicon
11
Which of the following is a positive effect of radiation?
Weakening of the immune system
Genetic mutations
Increased risk of cancer
Enhanced medical imaging
12
Chlorine has an atomic number of 17 and a mass of 35. How many electrons does chlorine have?
15
17
18
16
13
Which of the following statements about Beta Decay is correct?
An alpha particle is emitted from the nucleus.
A neutron is emitted from the nucleus.
A proton is emitted from the nucleus.
An electron is emitted from the nucleus.
14
Which scientist proposed the nuclear model of the atom?
JJ Thomson
Ernest Rutherford
John Dalton
Marie Curie
15
Which of the following best describes the half-life of a radioactive substance?
The time it takes for the substance to undergo nuclear fusion.
The time it takes for the substance to become stable.
The time it takes for half of the substance to decay.
The time it takes for the substance to become radioactive.
16
Which scientist proposed the idea of the atom?
Ernest Rutherford
John Dalton
JJ Thomson
Marie Curie
17
Which of the following subatomic particles has a negative charge?
Nucleus
Electron
Neutron
Proton
18
Which of the following elements has the atomic number 6?
Carbon
Hydrogen
Nitrogen
Oxygen
19
Which scientist is credited with the discovery of the atomic nucleus?
Ernest Rutherford
John Dalton
Marie Curie
JJ Thomson
20
Which of the following statements about isotopes is correct?
Isotopes have the same number of neutrons but different numbers of protons.
Isotopes have the same number of protons but different numbers of neutrons.
Isotopes have the same number of protons and neutrons.
Isotopes have different numbers of protons and electrons.
21
Which of the following is a negative effect of radiation?
Development of radiation sickness
Increased energy production
Improved food preservation
Decreased risk of heart disease
22
Which of the following is an example of a closed system?
A burning candle
A plant undergoing photosynthesis
A boiling pot of water
A chemical reaction in a sealed container
23
Which of the following best describes Green Chemistry?
The study of plants and their chemical properties.
The study of chemical reactions in closed systems.
The study of radioactive elements and their decay.
The use of environmentally friendly chemicals in industrial processes.
24
Which element has the symbol Li?
Lawrencium
Lanthanum
Nickel
Lithium
25
Which of the following is a sign that a chemical reaction is occurring?
Formation of a precipitate
Change in state of matter
All of the above
Release of light or heat
26
Which of the following subatomic particles has a positive charge?
Proton
Neutron
Nucleus
Electron
27
Which of the following statements best represents the Law of Conservation of Mass?
The mass of reactants is always greater than the total mass of products
Matter cannot be created or destroyed in a chemical reaction.
The total mass of reactants is always less than the total mass of products.
The total mass of reactants is always equal to the total mass of products.
28
Which of the following is an example of a compound?
Water (H2O)
Oxygen gas (O2)
Nitrogen gas (N2)
Hydrogen gas (H2)
29
What does the arrow in a chemical reaction equation represent?
The separation between reactants and products.
The energy change that occurs during the reaction.
The direction in which the reaction proceeds.
The equal sign indicating that the equation is balanced.
30
Carbon forms an isotope with a mass of 14. With an atomic number of 6, how many neutrons does the carbon iostope have?
8
9
6
7
31
Which of the following statements about Alpha Decay is correct?
An electron is emitted from the nucleus.
A proton is emitted from the nucleus.
A helium nucleus is emitted from the nucleus.
A neutron is emitted from the nucleus.
32
What is the purpose of balancing a chemical equation?
To determine the direction in which the reaction proceeds.
To show the energy change that occurs during the reaction.
To indicate the physical states of the reactants and products.
To ensure that the equation obeys the law of conservation of mass.
33
Is gold an element, compound or mixture?
mixture
element
compound
