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8.P.1.1 Classifying Matter Homework
1.How many elements are in the compound sulfuric acid, H2SO4?
A. 1
B. 2
C. 3
D. 6
2. A substance contains two components joined by physical means. Which BEST
describes the substance?
A. molecule
B. mixture
C. compound
D. element
3. Which of these best describes a physical change?
A. yarn being knitted by into a sweater
C. the metal on a bike forming
rust
B. the engine from a tractor being started D. grass capturing energy from sunlight
4. Which is the best example of a heterogeneous mixture?
A. salt water
B. salad
C. brass
D. sugar
5. Which chemical compound contains the greatest number of nitrogen (N) atoms?
A. NO3
B. N2O5
C. NH4NO3
D. (NH4)3PO4
6. Which substance is MOST LIKELY an element?
A. It can be changed into a simpler substance, solid at room temperature, and can be
heterogeneous or homogeneous
B. It cannot combine with other substances, liquid at room temperature, and cannot
be changed into simpler substances.
C. It is solid at room temperature, can be broken down from compounds by chemical
changes, and composed of one kind of atom.
7. Which is a homogeneous mixture?
A. woven fabric
B. concrete
8. An element is identified by
A. its number of protons
B. the type of charge
C. vinegar
D. pizza
C. the atomic mass
D. its number of isotopes
9. What is the smallest unit of an element that retains the properties of that element?
A. atom
B. neutron
C. molecule
D. electron
10. The compound potassium sulfate, K2SO4 , is composed of
A. one molecule of potassium and two molecules of sulfate
B. two molecules of potassium and one molecule of sulfate
C. 2 atoms of potassium, 4 atoms of sulfur, and 4 atoms of oxygen
D. 2 atoms of potassium, 1 atom of sulfur, and 4 atoms of oxygen
11. Which substance is an element?
A. carbon dioxide
C. water
B. oxygen
D. petroleum
12. How many atoms of oxygen are in a molecule of glucose, C6H12O6?
A. 24
B. 12
C. 6
D. 1
13. Which BEST explains how atoms combine to form compounds?
A. The atoms in the compound share electrons
B. The atoms in the compound share neutrons
C. The atoms in the compound share protons
14. The compound propane has three carbon atoms and eight hydrogen atoms. What is
the chemical formula of propane?
A. CH11
B. C3H8
C. C8H3
D. C11H
15. Which BEST explains how the atomic size of the elements is arranged in the periodic
table?
A. The atomic size of the elements decreases from left to right and increases from
top to bottom
B. The atomic size of the elements increases from left to right and increases from
top to bottom
C. The atomic size of the elements decreases from left to right and decreases from
top to bottom
16. Which element in large amounts is poisonous to humans?
A. arsenic
B. carbon dioxide
C. sodium chloride
17. Each of the elements in the periodic table has a specific number. What does this
number represent?
A. the half life
B. the number of protons
C. the number of neutrons
18. How many protons are in a sodium atom?
A. 1
B. 3
C. 11
19. In order to form water, two hydrogen atoms and one oxygen atom must be
A. mixed
B. divided
C. bonded
D. dissolved