PSB-HO: Natural Sciences: Chemistry (III) Questions and Correct Answers/ Latest Update / Already Graded

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PSB-HO: Natural Sciences: Chemistry
(III) Questions and Correct Answers/
Latest Update / Already Graded
Matter-


Ans: Substances that has mass and occupies space (volume).




Mass-


Ans: is a measure of the amount of substance in an object.




Weight-


Ans: is a measure of the gravitational pull of earth on any object.




The 4 states of matter & their characteristics:

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Ans: 1. Solid- dense and rigid with strong bonds.


2. Liquid- not dense and move around easily and have weak bonds.


3. Gas- atoms move around independently and do not form bonds.


4. Plasma- ionized gas that has some electrons that are free because they

are not bound to an atom or molecule.




Volume-


Ans: is the measure of the amount of space occupied.




Density-


Ans: is a measure of the amount of mass per unit volume.


- D = m/V




Specific gravity-


Ans: is a measure of the ratio of a substance's density compared to the

density of water.

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What causes the different states of matter?


Ans: The differences in distance and angles between molecules or atoms.




All matter consists of ______________ which consist ____________ &

________________.


Ans: Atoms, which consist of a nucleus and electrons.




The nucleus of a atoms:


Ans: - has protons and neutrons


- is positively charged


-is more dense and heavier than the surrounding electrons




An ion-


Ans: is a atom with a negative or positive charge.




An element-