Ch 2 : Question Preview (ID: 4479)

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The chemical element that is most abundant in the human body is
a) carbon
b) nitrogen
c) air
d) oxygen

You put 1 spoonful of salt into 1 Liter of water and stir. The resulting liquid is an example of a(n)
a) pure substance
b) homogeneous mixture
c) heterogeneous mixture
d) an element

A molecule of water H2O is made from____________ combining two hydrogen atoms and one oxygen atom
a) chemically
b) physically
c) ionically
d) thermally

Which of the following is not a potential sign of chemical change
a) release of gas
b) change of color
c) evaporation of water
d) production of gas

Lead has a density of 11.3 g/cm3 and a mass of 282.g. What is its volume
a) 2.5 cm3
b) 25 cm3
c) 250 cm3
d) 2500 cm3

The chemical formula for water (H2O) means that each water molecule contains
a) two hydrogen and two oxygen atoms
b) two hydrogen and one oxygen atoms
c) two hydrogen and zero oxygen atoms
d) one hydrogen and two oxygen atoms

A material that can be represented by a chemical formula is
a) an element
b) a mixture
c) a homogeneous solution
d) a pure substance

How many atoms are in a single molecule of FE2O3
a) 2
b) 3
c) 4
d) 5

Solids liquids, and gases are three forms of matter that
a) take up space
b) have mass
c) are made of atoms
d) all the answers are correct

The smallest unit of an element that maintains the properties of that element is a
a) molecule
b) substance
c) compound
d) atom

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