Chemistry Practice Test 1 Flashcards
6 cards from real ATI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Chemistry Practice Test 1 flashcards as text
If 0.5 moles of NaCl are dissolved in 2.0 liters of water, what is the molarity of the solution?
Answer: 0.25 M
Molarity (M) = moles of solute ÷ liters of solution. 0.5 mol ÷ 2.0 L = 0.25 M.
Which type of chemical bond is formed when two nonmetal atoms share electrons equally?
Answer: Nonpolar covalent bond
A nonpolar covalent bond forms when electrons are shared equally between two atoms of the same or similar electronegativity, as seen in molecules like O₂ or N₂.
How many valence electrons does an oxygen atom (atomic number 8) have?
Answer: 6
Oxygen has the electron configuration 2, 6 — meaning 2 electrons in the first shell and 6 in the second (valence) shell.
When hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) in a neutralization reaction, what are the products?
Answer: NaCl and H₂O
Acid–base neutralization produces a salt and water. HCl + NaOH → NaCl (salt) + H₂O.
Two atoms of the same element that have the same number of protons but different numbers of neutrons are called:
Answer: Isotopes
Isotopes are atoms of the same element (same atomic number/protons) that differ in their number of neutrons, giving them different mass numbers.
Which statement best describes an exothermic chemical reaction?
Answer: It releases heat energy to the surroundings.
In an exothermic reaction, the products have less energy than the reactants, so the excess energy is released as heat into the surroundings (e.g., combustion).