Midterm CP1 Chemistry Review

What is the significance of significant figures in measurements?

• They determine the precision of measurements

• They are used to convert units

• They are used to balance equations

• They are used to identify elements

Tags

NGSS.HS-PS2-1

What is an isotope?

• An atom with a different number of protons

• An atom with a different number of electrons

• An atom with a different number of neutrons

• An atom with a different number of molecules

Tags

NGSS.HS-PS1-8

According to the Pauli Exclusion Principle, what is true about electrons in an atom?

• No two electrons can have the same set of quantum numbers.

• Electrons can have the same set of quantum numbers.

• Electrons must always be paired.

• Electrons can occupy the same orbital indefinitely.

What is the difference between nonpolar and polar covalent bonds?

• Nonpolar bonds have equal sharing of electrons, while polar bonds have unequal sharing.

• Nonpolar bonds have unequal sharing of electrons, while polar bonds have equal sharing.

• Both have equal sharing of electrons.

• Both have unequal sharing of electrons.

Tags

NGSS.HS-PS1-1

Which is the correct scientific notation for 0.00045?

• 4.5 × 10^-4

• 4.5 × 10^-5

• 45 × 10^-5

• 0.45 × 10^-4

What is the safest way to handle chemicals in a lab?

• Wear goggles and gloves

• Taste small amounts to check their properties

• Use bare hands to handle chemicals

• Mix chemicals without checking for compatibility

Which of the following is not a base unit in the SI system?

• Meter

• Kilogram

• Second

• Gallon

What is the correct scientific notation for 0.000123?

• 1.23 × 10^-4

• 1.23 × 10^-5

• 12.3 × 10^-5

• 0.123 × 10^-3

Which particle has a negative charge?

• Proton

• Neutron

• Electron

• Ion

Tags

NGSS.MS-PS2-3

What is the mass number of an atom?

• The total number of protons

• The sum of protons and neutrons

• The total number of electrons

• The difference between protons and neutrons