Nurse Cheung TEAS 7 - Most Common Chemistry Questions 2026
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15 Terms
What is the chemical formula for water?
H2O
Which of the following is an example of an exothermic reaction?
Burning wood
What is the difference between an exothermic reaction and an endothermic reaction?
Exothermic-Releases energy (heat) to surroundings (exit)
Endothermic- Takes in energy (heat) from surroundings (enter)
A student dissolves NaOH in water and the temperature of the solution rises. What can be concluded?
The dissolution is exothermic
What is the atomic number of an atom that has 12 protons and 12 neutrons?
12
Why are noble gases generally unreactive?
Their outer electron shells are full.
Nitrogen gas is an extremely stable molecule because?
It forms triple covalent bonds
Which of the following summarizes a change as a solid turns into a liquid?
Particles become less ordered
What describes the role of a catalyst in a chemical reaction?
Gives an alternative reaction pathway for lower reaction energy
Which of the following occurs in an oxidation reaction?
Removal of electrons
Which of the following occurs in a reduction reaction?
Gain of electrons
Which of the following is a physical change but not a chemical change?
Water boiling
Which of the following atoms is most likely to become an anion?
Fluorine-atomic number 9
What happens to the pH when a strong acid is added to a solution?
The pH will decrease and become more acidic.
Freshly cut avocados tend to turn brown when exposed to air but squeezing lime juice over the surface helps them to stay green. Which of the following best explains this effect?
Lime juice has a pH that inactivates the enzymes responsible for browning