Mixture, Compounds And Atoms
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Based on science knowledge.
- 1.
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Atoms are composed of :- A.
Electrons, neutrons, protos
- B.
Electrons, neutrons, protons
- C.
None of above
- 2.Which bond exchanges electrons?
- A.
Covalent
- B.
Ionic
- 3.Which particle orbits the nucleus?
- A.
Neutrons
- B.
Protons
- C.
Electrons
- 4.Which of the following particle has a positive charge?
- A.
Neutrons
- B.
Protons
- C.
Electrons
- 5.Which of the following particle has no charge?
- A.
Neutrons
- B.
Protons
- C.
Electrons
- 6.Most atoms form bonds using only the electrons in their ____ energy level.
- A.
Outermost
- B.
Innermost
- 7.Which of the following describes what happens when an atom becomes an ion with a 2– charge?
- A.
The atom gains 2 electrons.
- B.
The atom loses 2 electrons.
- C.
The atom has a full outer shell
- 8.The first energy level is closest to the nucleus and can hold up to ____ electrons.
- A.
2
- B.
4
- C.
8
- 9.The second energy level can hold up to ____ electrons.
- A.
2
- B.
4
- C.
8
- 10.Atoms ____ to have a filled outermost energy level
- A.
Split
- B.
Bond
- 11.Atoms bond by ____ electrons.
- A.
Gain
- B.
Lose
- C.
Share
- D.
All of above
- 12.Which of the following is a pure substance made up of one type of atoms?
- A.
An element
- B.
Mixture
- C.
Compound
- 13.What is Filtration?
- A.
Separating an insoluble substance from a liquid by passing the mixture through porous paper.
- B.
Heating to separate a soluble substance such as table salt from water
- C.
None of above
- 14.What is Distillation?
- A.
A combination of 2 processes- evaporation followed by condensation(eg. to make pure water from seawater
- B.
Heating to separate a soluble substance such as table salt from water
- C.
Separating an insoluble substance from a liquid by passing the mixture through porus paper.
- 15.Separating funnel
- A.
Separating an insoluble substance from a liquid by passing the mixture through porous paper.
- B.
Heating to separate a soluble substance such as table salt from water
- C.
A device to separate heavy liquids(eg. water) from lighter liquids(eg. kerosene)
- 16.Compounds can be separated by:
- A.
Chemical means only
- B.
Physical means only
- 17.A negative ion is a:
- A.
Anion
- B.
Cation
- 18.An impure substance made up of two or more elements or compounds both mechanically mixed into any proportion and can be further sub-divided by physical means is a
- A.
Mixture
- B.
Compound
- 19.A pure substance made up of two or more elements chemically combined in a fixed proportion can be sub-divided by chemical means only is a
- A.
Mixture
- B.
Compound
- 20.This type of mixture has the same composition through out.
- A.
Homogeneous
- B.
Heterogeneous
- 21.This type of mixture has a composition that is not uniform.
- A.
Homogeneous
- B.
Heterogeneous
- 22.This is the liquid which passes through filter paper during filtration.
- A.
Filtrate
- B.
Residue
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