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WorksheetsBiology- Section 2.1 & 2.2
Total questions: 20
Worksheet time: 10mins
The three particles that make up atoms are
protons, neutrons, and isotopes.
neutrons, isotopes, and electrons.
positives, negatives, and neutrals.
protons, neutrons, and electrons.
What are found in the space surrounding the nucleus of an atom?
protons
electrons
neutrons
ions
If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is
3.
4.
7.
11.
A chlorine atom that has 17 protons and 18 neutrons is called
chlorine-17.
chlorine-18.
chlorine-35.
chlorine-1.
Isotopes are atoms of the same element with the same number of protons and a different number of
electrons.
molecules.
neutrons.
ions.
If an atom contains 11 protons and 12 neutrons, its atomic number is
1.
11.
12.
23.
Which of the following is a substance formed by the chemical joining of two or more elements in definite amounts?
compound
isotope
nucleus
enzyme
Which of the following makes up a molecule of water?
one atom of hydrogen and one atom of oxygen
one atom of sodium and one atom of chlorine
one atom of hydrogen and two atoms of oxygen
two atoms of hydrogen and one atom of oxygen
A covalent bond is formed as the result of
transferring electrons.
sharing electrons.
transferring protons.
sharing protons.
What type of electron is available to form bonds?
valence
nucleus
ionic
covalent
What type of ion forms when an atom loses electrons?
neutral
positive
negative
radioactive
Water molecules are polar, with the
oxygen side being slightly positive and the hydrogen side being slightly negative.
oxygen and hydrogen sides being slightly positive.
oxygen and hydrogen sides being slightly negative.
oxygen side being slightly negative and the hydrogen side being slightly positive.
In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is
slightly negative.
very negative.
slightly positive.
very positive.
A solution is a
combination of isotopes.
chemical reaction.
mixture in which the substances are evenly spread out.
mixture in which undissolved substances do not settle out.
If you stir salt into boiling water, you produce a
mixture called a suspension.
mixture called a solution.
solution and suspension.
mixture only.
When salt is dissolved in water, water is the
reactant.
solution.
solute.
solvent.
While preparing a cell culture, a scientist places a colony of bacteria into distilled water and stirs it up. This mixture of water and living cells would best be called
a solution.
a suspension.
a buffer.
an adhesion.
A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York State varies from 4.22 to 4.40. According to these figures, the most acidic rainfall in New York State has a pH of
4.22.
4.30.
4.35.
4.40.
A substance with a pH of 6 is called
an acid.
a base.
water.
a suspension.
Solutions that have more OH- than H+ ions are
reactants.
acids.
bases.
enzymes.
