chemistry Flashcards
Why are control groups used in
experiments?
To minimize the effect of variables
Which of the following statements is true
about hydrogen bonds?
They form between a partial positively
charged region on one molecule and
the partial negatively charged region on
another molecule.
Movement of molecules in a substance
depends on _______ energy.
heat
atoms
All matter is made of particles
Which of the following substances would
not dissolve in water?
C3H6
NaCl
ionic bonds
Balance the following chemical equation:
CH4 + Cl2 → CCl4 + HCl
CH4 + 4 Cl2 → CCl4 + 4 HCl
Which of the following descriptions is
correct?
Gas: no definite volume and no definite
shape
Liquids
occupy whatever shape their container
has, so they do not have a fixed shape.
Atomic Structure
An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus.
purpose of a catalyst in a chemical reaction
to increase reaction rate
covalent bond
the sharing of an electron pair between two atoms.
homogeneous mixture
air
not a state of matter
energy
activation energy
minimum amount of energy needed for a chemical reaction to occur
