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Chemistry, 12.11.2020 22:50, anthonypacheco
PLEASE! 46 POINTS!
1.-There are millions of unique substances in the universe because elements can combine in many different ways to form .
A.-mixtures
B.-solutions
C.-compounds
D.-ions
2.- Water is an example of a(n) .
A.-unique substance
B.-chemical compound
C.-covalent compound
D.-all of the above
3.- Which statement is true about water and hydrogen peroxide?
A.-Both substances have the same properties.
B.-Both substances have the same chemical formula.
C.-Both substances consist of hydrogen and oxygen
D.-Both substances are mixtures of elements.
4.-. Chemical bonds always involve .
A.-ions
B.-atoms
C.-metals
D.-electrons
5. The ratio of elements in a given compound .
A.-is always 2 to 1
B.-is always the same
C.-may vary
D.-two of the above
6. An oxygen atom has eight valence electrons.
True
False
7. A molecule of carbon monoxide has two carbon atoms and one oxygen atom. True
False
8.- The types of bonds in chemical compounds determine many of their properties.
True
False
9.- The same elements may form different compounds.
True
False
10.- The chemical formula for carbon dioxide is CO2.
True
False
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Answers: 1
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PLEASE! 46 POINTS!
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