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WorksheetsGrade 8 Elements, Compounds, and Mixtures
Total questions: 24
Worksheet time: 11mins
What is the smallest unit of an element?
ion
compound
molecule
atom
Which of the following is a compound? (A) O2 (B) H2O (C) Na (D) Cl2
NaCl
H2O
CO2
H2
Which of the following is a characteristic of a compound? (A) Fixed composition (B) Variable composition (C) Can be separated by physical means (D) None of the above
A
Can be formed by mixing elements
Has a variable boiling point
Always exists in solid state
Fill in the blank: Elements are made up of only one type of __________.
atom
compound
molecule
mixture
What is the main difference between a compound and a mixture?
A mixture has a fixed composition and chemical bonds, while a compound has variable composition and no chemical bonds.
A compound has a fixed composition and chemical bonds, while a mixture has variable composition and no chemical bonds.
A compound is always a solid, while a mixture can be a liquid or gas.
A compound can be separated by physical means, while a mixture cannot.
Which of the following is a homogeneous mixture? (A) Salad (B) Air (C) Sand and salt (D) Oil and water
Fruit salad
Granite
Vinegar and oil
Air
Drag and drop the following elements into the correct group: Oxygen, Hydrogen, Carbon, Sodium.
Chlorine
Calcium
Nonmetals: [Oxygen, Hydrogen, Carbon]; Metal: [Sodium]
Potassium
Fill in the blank: A __________ is a combination of two or more substances that retain their individual properties.
compound
element
solution
mixture
Which of the following is NOT a property of mixtures? (A) They can be separated by physical means (B) They have a fixed composition (C) They can be homogeneous or heterogeneous (D) They consist of two or more substances
They can only be separated by chemical means
They have a variable composition
They always consist of a single substance
B
What type of mixture is formed when salt is dissolved in water?
solution
colloid
emulsion
suspension
Fill in the blank: The chemical formula for table salt is __________.
NaCl
CaCl2
KCl
MgCl2
Which of the following best describes an element? (A) A pure substance made of only one type of atom (B) A combination of two or more substances (C) A substance that can be separated by chemical means (D) None of the above
A pure substance made of only one type of atom
A mixture of different elements
A compound made of two or more atoms
A substance that cannot be broken down
Drag and drop the following into the correct categories: Mixture, Compound, Element: Water, Air, Gold, Sugar, Iron.
Mixture: Air; Compound: Water, Sugar; Element: Gold, Iron
Salt
Oxygen
Carbon Dioxide
What is the process of separating a mixture using a filter called?
Evaporation
Filtration
Distillation
Centrifugation
Fill in the blank: A __________ is a substance that cannot be broken down into simpler substances by chemical means.
solution
mixture
compound
element
Which of the following is an example of a heterogeneous mixture? (A) Sugar water (B) Salad dressing (C) Steel (D) Air
Milk
Salad dressing
Salt water
Granite
Fill in the blank: The basic building blocks of matter are __________.
cells
compounds
molecules
atoms
Structure B is
The nucleus
An electron shell
An energy level
Structure C is a(n)
Proton
Neutron
Electron
Structure D is a(n)
Proton
Neutron
Electron
Structure E is a(n)
Proton
Neutron
Electron
Structure E has what charge?
Neutral
Positive
Negative
Structure D has what charge?
Neutral
Positive
Negative
Which of the following correctly defines electrostatic attraction
