CHEM I Spring Final Exam Review

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with distinct properties, often indicated by color change, gas production, or formation of a precipitate.

Front

What is evidence of a physical change?

Back

Evidence of a physical change includes changes in state (solid, liquid, gas) without altering the chemical composition of the substance.

Front

What is the balanced equation for the reaction of magnesium and hydrochloric acid?

Back

The balanced equation is: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g).

Front

How do you calculate molarity?

Back

Molarity (M) is calculated using the formula: M = moles of solute / liters of solution.

Front

What is the molarity of a solution with 7 moles of solute in 2.5 L of solution?

Back

The molarity is 2.8 M.

Front

What type of reaction is C3H8 + O2 → CO2 + H2O?

Back

This is a combustion reaction.

Front

What is the definition of a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the significance of coefficients in a balanced chemical equation?

Back

Coefficients indicate the number of moles of each substance involved in the reaction, ensuring the law of conservation of mass is upheld.

Front

How many moles are in 36 g of beryllium (Be)?

Back

There are 4 moles of beryllium in 36 g of Be.

Front

What is the difference between an endothermic and exothermic reaction?

Back

An endothermic reaction absorbs heat from the surroundings, while an exothermic reaction releases heat.