Chemistry Semester 1 Review

Front

How many significant figures does the number 100.00210 have?

Back

8 significant figures.

Front

How many miles are in a 10.0 kilometer race?

Back

6.21 miles.

Front

How many minutes are in a school year of 187 days?

Back

269,000 minutes.

Front

What is the name of the ionic compound MgSO4?

Back

Magnesium sulfate.

Front

If an atom has 12 positively charged subatomic particles, how many electrons must it have to be neutral?

Back

12 electrons.

Front

What is the definition of significant figures?

Back

Significant figures are the digits in a number that contribute to its precision.

Front

What is the formula to convert kilometers to miles?

Back

Miles = Kilometers × 0.621371.

Front

What is the definition of an ionic compound?

Back

An ionic compound is formed when atoms transfer electrons, resulting in positive and negative ions.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the difference between protons, neutrons, and electrons?

Back

Protons are positively charged, neutrons are neutral, and electrons are negatively charged subatomic particles.