Biology Exam 2 review

Which of the following is a chemical reaction?

• Tearing paper into strips

• Burning paper

• Picking up iron fillings with a magnet

• Mixing salt and sugar in the same container

Tags

NGSS.MS-PS1-2

Represents a formula for a chemical compound.

• H

• C

• H2O

Tags

NGSS.MS-PS1-1

The nucleus of an atom contains _____.

• Protons and neutrons

• Protons and electrons

• Neutrons and electrons

• Protons, neutrons, and electrons

Tags

NGSS.MS-PS1-1

Electrons move about the atom in regions called _____.

• Energy levels

• Air

• Nuclei

• Isotopes

Tags

NGSS.MS-PS1-1

This element can be used to find the age of fossils.

• H-2

• H-3

• C-14

• Cu-27

A very strong base might have a pH of ____.

• 3

• 9

• 5

• 13

Carbon 12, Carbon 13, and Carbon 14 are ___.

• Isotopes

• Radioactive

• Polymers

• Macromolecules

The total number of atoms in a molecule of sucrose, C12H22O11 is _____.

• 11

• 22

• 12

• 45

Tags

NGSS.MS-PS1-1

An atom of fluorine has nine electrons. Its second energy level has ____.

• Two electrons

• Seven electrons

• Eight electrons

• Nine electrons

The number of atoms of an element in a compound is represented by ________ in a chemical formula.

• Coefficient

• Letter

• Variable

• Subscript