Grade 7 Chemistry – March Test Review_Quizizz

What is a compound (化合物)?

• A single element (元素)

• A substance made of two or more different elements (元素)

• A mixture of elements (元素)

• A gas (气体) only

Which of the following is a molecule (分子)?

• Oxygen (氧气) (O₂)

• Iron (铁) (Fe)

• Gold (黄金) (Au)

• All of the above

What does the “-ide” suffix indicate in a compound name (化合物名称)?

• It contains oxygen (氧)

• It is a non-metal (非金属)

• It is a compound (化合物) of a metal (金属) and non-metal (非金属)

• It is a gas (气体)

Which of the following is an example of a compound (化合物)?

• Helium (氦) (He)

• Water (水) (H₂O)

• Carbon (碳) (C)

• Silver (银) (Ag)

What is the fixed ratio in water (水) (H₂O)?

• 1 hydrogen (氢) and 2 oxygen (氧)

• 2 hydrogen (氢) and 1 oxygen (氧)

• 2 hydrogen (氢) and 2 oxygen (氧)

• 1 hydrogen (氢) and 1 oxygen (氧)

Why do compounds (化合物) have different properties than their elements (元素)?

• Because they are made of the same type of atoms (原子)

• Because their particles (粒子) are different

• Because they are liquids (液体)

• Because they are gases (气体)

How do you name a non-metal compound (非金属化合物)?

• By using prefixes to denote the number of atoms

• By using Roman numerals

• By using suffixes to denote the type of bond

• By using the metal's oxidation state

What is the name of the compound (化合物) NaCl?

• Sodium oxide (氧化钠)

• Sodium chloride (氯化钠)

• Sodium sulfate (硫酸钠)

• Sodium hydroxide (氢氧化钠)

What do we use to indicate the number of atoms (原子) in non-metal compounds (非金属化合物)?

• Suffixes (后缀)

• Prefixes (前缀)

• Chemical symbol (化学符号)

• Atomic numbers (原子序数)

What is an example of a compound (化合物) made of a metal (金属) and oxygen (氧)?

• CO₂ (二氧化碳)

• Na₂O (氧化钠)

• H₂O (水)

• Cl₂ (氯气)