MAP Chemistry Semester Midterm Review 2024

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 7945?

Back

4 significant figures.

Front

What is a single replacement reaction?

Back

A single replacement reaction is a type of chemical reaction where one element replaces another in a compound.

Front

Predict the products of the reaction: K + HCl → ?

Back

KCl + H₂.

Front

How do you calculate moles from atoms?

Back

To calculate moles from atoms, use the formula: Moles = Number of atoms / Avogadro's number (6.022 x 10²³).

Front

How many moles are in 3.01 x 10²² atoms of magnesium?

Back

0.0500 moles.

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the molar mass of Mg(OH)₂?

Back

58.32 g/mol.

Front

What is a synthesis reaction?

Back

A synthesis reaction is a type of chemical reaction where two or more reactants combine to form a single product.

Front

Identify an example of a synthesis reaction: Na + Br₂ → ?

Back

NaBr.