NYSTCE ATAS NYSTCE Chemistry 2 — Questions and Answers
Question 1: Which type of chemical bond results from the electrostatic attraction between oppositely charged ions?
- Covalent bond
- Ionic bond (Correct answer)
- Hydrogen bond
- Metallic bond
Correct answer: Ionic bond
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:
- Synthesis reaction
- Decomposition reaction
- Double displacement reaction (Correct answer)
- Single displacement reaction
Correct answer: Double displacement reaction
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?
- Same number of protons
- Same atomic mass
- Same number of valence electrons (Correct answer)
- Same electronegativity value
Correct answer: Same number of valence electrons
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?
- Energy is absorbed from the surroundings
- Products have more energy than reactants
- Heat is released into the surroundings (Correct answer)
- The reaction requires continuous external heating
Correct answer: Heat is released into the surroundings
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?
- 0.5 M (Correct answer)
- 1.0 M
- 2.0 M
- 29.25 M
Correct answer: 0.5 M
Molarity = moles/volume = (58.5 g ÷ 58.5 g/mol) ÷ 2.0 L = 1.0 mol ÷ 2.0 L = 0.5 M.
Question 6: Which subatomic particle determines the chemical identity (element) of an atom?
- Neutron
- Electron
- Proton (Correct answer)
- Nucleon
Correct answer: Proton
The number of protons (atomic number) uniquely identifies each element on the periodic table.
Question 7: When assisting a student with a lab, a teaching assistant notices a chemical spill on the lab bench. The FIRST action should be to:
- Dilute the spill with water immediately
- Notify the supervising teacher and follow safety protocols (Correct answer)
- Clean it up with paper towels without telling anyone
- Evacuate the entire building
Correct answer: Notify the supervising teacher and follow safety protocols
The first step in any lab safety incident is to notify the supervising teacher so proper protocols can be followed safely.
NYSTCE ATAS NYSTCE Chemistry 2
Which type of chemical bond results from the electrostatic attraction between oppositely charged ions?