chapter 1
What holds atoms together in a molecule?
chemical bonds
The resistance of a liquid to flowing is its
viscosity.
In general, which of the following statements about metals is true?
Metals are malleable, ductile, and can carry an electric current.
An ionic bond is the attraction between
oppositely charged ions.
Chemistry is
the study of matter and how matter changes.
The volume of an irregular object can be measured by
submerging the object in water in a graduated cylinder.
The freezing point of water is the same as its
melting point.
A material is said to be ductile if it
can be pulled out, or drawn, into a long wire.
An ionic bond is the attraction between
oppositely charged ions.
true or false The amount of matter in a chemical reaction changes.
true or false The smallest particle of an element is called a(n) atom.
True
What is vaporization?
a liquid becoming a gas
Mendeleev created the first periodic table by arranging elements in order of
increasing atomic mass.
When an atom loses an electron, it becomes a
positive ion.
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a
decomposition reaction.
One example of a chemical change is
burning wood.
When the temperature of a gas decreases , its
pressure decreases.
The atomic mass consists of
protons plus neutrons
The chemical name for the compound with the formula Na2S is
sodium sulfide.
Every chemical reaction involves a change in
energy.
The ability to do work or cause change describes
When an inflated balloon is exposed to cold air,
Which parts of the atom have a negative charge and move around the nucleus?
electrons
Electrons involved in bonding between atoms are
valence electrons.
A chemical reaction that absorbs energy in the form of heat is described as
endothermic.