8th Grade Review - Matter/Chemistry Question Preview (ID: 61597)
Coach Book Ch.1.
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What 2 elements are in the same group or fmaily?
a) flourine and neon
b) sulfur and chlorine
c) chlorine and argon
d) fluorine and chlorine
According to the law of Conservation of Mass, which of these statements are true?
a) The mass of products in a chemical reaction equals the mass of the reactants.
b) New matter is created in a chemical reactions
c) Atoms are broken down into smaller parts in a chemical reaction.
d) The mass of the reactants in a chemical reaction is greater than the mass of the products.
When substances are combined to form a mixture, they
a) form new chemical bonds
b) form a new compound
c) keep their original properties
d) cannot be separated physically
If you heart a liquid to determine the temperature at which it forms bubbles and changes to a gas, you are measuring
a) a physical property called conductivity
b) a chemical property called reactivity
c) a physical property called boiling point
d) a chemical property called solubility
Elements in the same column of the periodic table have
a) similar chemical properties
b) the same number of protons
c) similar atomic masses
d) atoms of the same size
Which of these is a physical change?
a) forming a precipitate
b) rusting
c) melting
d) burning
Which of the following statements about elements is FALSE?
a) an element is a pure substance
b) an element is made up of a compound
c) an element is represented by a chemical symbol
d) each element has its own atomic number
Where are the metalloids located in the period table?
a) in the far-left corner
b) in the far-right corner
c) in the top row
d) along the stairstep line
Which is always tru of a balanced chemical equation/
a) Coefficients on both sides of the equation are multiples of 2
b) The subscripts on one side of the equation are the same as the subscripts on the other sidets
c) The number of molecules is the same on both sides of the equation
d) Both sides of the equation contain the same elements and the same number of atoms
Which of these is NOT evidence that a chemical change may have taken place?
a) release of heat
b) formation of precipitate
c) change in shape
d) change in color
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