WorksheetsGrade 7 Chemistry – March Test Review_Quizizz
Total questions: 20
Worksheet time: 10mins
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)
What is a mixture (混合物)?
A) A single substance (物质)
B) Two or more substances (物质) that are chemically combined
C) Two or more substances (物质) that are not chemically combined
D) A solid (固体) only
Which of the following is an example of a mixture (混合物)?
Water (水) (H₂O)
Salt (盐) (NaCl)
Salad (沙拉)
Oxygen (氧气) (O₂)
What do particle diagrams (粒子图) show?
How substances (物质) change color
How atoms (原子) are arranged
How compounds (化合物) are formed
How mixtures (混合物) are separated
Which of these can be a mixture?
Only solids (固体)
Only liquids (液体)
Solids (固体), liquids (液体), and gases (气体)
Only gases (气体)
What do we use to represent substances (物质) in a model of a mixture?
Different colors (颜色) of beads (珠子)
Only one color (颜色) of bead (珠子)
Only numbers (数字)
Only letters (字母)
Why can you see the individual parts (部分) in a mixture?
Because they are chemically bonded (化学结合)
Because they are not chemically combined (化学结合)
Because they are all liquids (液体)
Because they are all gases (气体)
How are mixtures used in real life?
Only in classrooms (教室)
In food (食物), medicine (药物), and cleaning products (清洁产品)
Only in laboratories (实验室)
Only in factories (工厂)
What is an example of a mixture of gases?
Salad (沙拉)
Fruit juice (果汁)
Air (空气)
What happens to substances (物质) in a mixture?
A) They change into new substances (物质)
B) They stay the same and can be separated (分开)
C) They disappear (消失)
D) They melt (融化)
How can we model mixtures?
By using only one type (类型) of bead (珠子)
By using different colored beads (珠子) to represent different substances (物质)
By using only numbers (数字)
By drawing only one color (颜色)
