HChem 1st Semester Exam Review - 2

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

How many significant figures are in the number 153.0 mL?

Back

4

Front

How many significant figures are in the number 0.012 km?

Back

2

Front

When adding or subtracting, how do you determine the number of significant figures in the result?

Back

The result should have the same number of decimal places as the measurement with the least number of decimal places.

Front

Solve and give your answer with the correct number of significant figures: 24.28 + 12.5

Back

36.8

Front

When subtracting, how do you determine the number of significant figures in the result?

Back

The result should have the same number of decimal places as the measurement with the least number of decimal places.

Front

Solve and give your answer with the correct number of significant figures: 1421 - 34

Back

1387

Front

What type of intermolecular force exists in CH4?

Back

London forces.

Front

What are London dispersion forces?

Back

London dispersion forces are weak intermolecular forces that arise from temporary shifts in electron density in atoms or molecules, leading to temporary dipoles.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonds involve the sharing of electrons between atoms.