HESI Chemistry Practice Test 2

Question 1

All of the following factors influence the pace of a chemical reaction except?

Accepted Answer

Amount of mass lost

Answer

The pace or rate of a chemical reaction is influenced by factors such as the presence of catalysts, the surface area of reactants, and the temperature. The 'amount of mass lost' is not a factor influencing the reaction rate; rather, it would be a measurement of the extent of a reaction, and mass is conserved in chemical reactions.

Question 2

Which of the following statements about most metals is false?

Accepted Answer

They are gases at room temperature

Answer

Most metals are known for properties like ductility, malleability, and being good conductors of heat and electricity. They constitute the majority of elements on the periodic table and are typically solid at room temperature, with mercury being a notable exception. Therefore, the statement that they are gases at room temperature is false.

Question 3

Which of the following elements does not appear on the periodic table?

Accepted Answer

Magnesium oxide

Answer

The periodic table lists all known chemical elements. Chlorine, Bromine, and Phosphorous are all individual elements found on this table. Magnesium oxide (MgO), however, is a chemical compound formed from the elements Magnesium (Mg) and Oxygen (O), not an element itself, and thus does not appear on the periodic table.

Question 4

Lisa prepares soup by combining spices in a saucepan of boiling water and stirring until the spices are completely dissolved. She then adds a variety of diced veggies. What is the solute in her mixture?

Accepted Answer

Spices

Answer

In a solution, the solute is the substance that gets dissolved, and the solvent is the substance that does the dissolving. In Lisa's soup, the spices are dissolved in the boiling water. Therefore, the spices are the solute in this mixture.

Question 5

Using the Lewis-dot structure model, how many dots would carbon have?

Accepted Answer

4

Answer

The Lewis-dot structure model represents an atom's valence electrons as dots around its symbol. Carbon is in Group 14 of the periodic table, meaning it has 4 valence electrons. Therefore, carbon would have 4 dots in its Lewis-dot structure.

HESI (ATI) Practice Test

HESI (ATI) Practice Test

HESI Chemistry Practice Test 2