Chemistry Concepts Midterm Review Pt 1.

What is the term used to describe the closeness of a measured value to a standard or accepted value?

• Precision

• Accuracy

• Consistency

• Reliability

Which of the following best describes precision?

• Closeness to a standard value

• Consistency of repeated measurements

• Measurement of mass per unit volume

• Ability to measure accurately

What is a cation?

• A negatively charged ion

• A positively charged ion

• A neutral molecule

• An atom with no charge

Which of the following is an example of an anion?

• Sodium ion (Na⁺)

• Chloride ion (Cl⁻)

• Calcium ion (Ca²⁺)

• Potassium ion (K⁺)

What type of compound is formed from cations and anions?

• Molecular compound

• Covalent compound

• Ionic compound

• Metallic compound

Which of the following is a molecular compound?

• Sodium chloride (NaCl)

• Magnesium oxide (MgO)

• Water (H₂O)

• Calcium carbonate (CaCO₃)

What happens during oxidation in a chemical reaction?

• Gain of electrons

• Loss of electrons

• Decrease in oxidation state

• Formation of covalent bonds

• Reduction

• Oxidation

• Neutralization

• Precipitation

What is the process called when there is a gain of electrons in a chemical reaction?

• Oxidation

• Reduction

• Ionization

• Combustion

• It is oxidized

• It is reduced

• It is neutralized

• It is dissolved