NYSTCE ATAS NYSTCE Chemistry 2

Question 1

Which type of chemical bond results from the electrostatic attraction between oppositely charged ions?

Accepted Answer

Ionic bond

Answer

Ionic bonds form when electrons are transferred from one atom to another, creating oppositely charged ions that attract each other.

Question 2

A student mixes vinegar and baking soda and observes bubbling. This reaction is best classified as a:

Accepted Answer

Double displacement reaction

Answer

Vinegar (acetic acid) and baking soda (sodium bicarbonate) undergo a double displacement reaction producing CO₂ gas, water, and sodium acetate.

Question 3

On the periodic table, elements in the same GROUP share which characteristic?

Accepted Answer

Same number of valence electrons

Answer

Elements in the same group (vertical column) have the same number of valence electrons, which gives them similar chemical properties.

Question 4

Which of the following best describes an exothermic reaction?

Accepted Answer

Heat is released into the surroundings

Answer

Exothermic reactions release energy (heat) into the surroundings, so the products have less energy than the reactants.

Question 5

What is the molarity of a solution made by dissolving 58.5 g of NaCl (molar mass = 58.5 g/mol) in enough water to make 2.0 L of solution?

Accepted Answer

0.5 M

Answer

Molarity = moles/volume = (58.5 g ÷ 58.5 g/mol) ÷ 2.0 L = 1.0 mol ÷ 2.0 L = 0.5 M.

NYSTCE ATAS - NYSTCE Assessment of Teaching Assistant Skills Practice Test