8th Grade Exam 2: Question Preview (ID: 1199)


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Why are the partcles in matter always moving?
a) because they have energy b) because they are being pushed c) because of their mass d) because of gravity
The change of state from liqid to gas is called
a) evaporation b) condensation c) freezing d) melting
An xample of a chemical property is
a) flammability b) boiling point c) density d) volume
The chemical changes that occur during photosnythesis
a) obey the law of conservation and mass b) cause new matter to be created c) are an exception to the law of conservation and mass d) are not effected by the law of conservation and mass
The particles known as the bilding blocks of matter are
a) atoms b) molecules c) elements d) compounds
Evaporation is what occus when
a) a liquid becomes a gas b) a gas becomes a liquid c) a solid becomes a liquid d) a gas becomes a plasma
Less helium would be needed to fill a balloon on a(n)
a) rainy day b) hot day c) humid day d) cold day
The smallest paricle into which an element can be divided and still be the same substance is called
a) nucleus b) electron c) atom d) neutron
How would you describe the nucleus?
a) dense, positively charged b) large, positively charged c) tiny, negatively charged d) dense, negatively charged
An atom of gold with 79 protons, 79 electrons, 18neutrons would have a mass number of
a) 158 b) 197 c) 276 d) 39
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