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WorksheetsLMS 8th Grade Science Homework #5
Total questions: 25
Worksheet time: 16mins
Name
Class
Date
1.
Contains only one kind of atom.
a)
Element
b)
Compund
c)
Mixture
2.
Is sugar (C12H22O11) an element or a compound?
a)
Element
b)
Compound
3.
Is salt (NaCI) a compound or a element?
a)
Compound
b)
Element
4.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
5.
I am the smallest unit of an element that still has all the element's basic properties.
a)
atom
b)
compound
c)
molecule
d)
mixture
6.
A pure substance
a)
compound
b)
element
c)
molecule
7.
An element's identity is determined by the number of
a)
electrons.
b)
protons.
c)
neutrons.
d)
valence.
8.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
9.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
10.
2H2 + O2 --------> 2H2O What are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
11.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
12.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
13.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
14.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
15.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
16.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
17.
The number in front of a compound or element is a
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
18.
The number to the lower side of an element is a
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
19.
What is another term to describe a consumer?
a)
Autotroph
b)
Heterotroph
20.
What is another term to describe a producer?
a)
Autotroph
b)
Heterotroph
21.
How can animals and fungi best be classified?
a)
Autotroph
b)
Heterotroph
22.
From where do autotrophs obtain their energy?
a)
The sun
b)
Other organisms
23.
From where do heterotrophs obtain their energy?
a)
The sun
b)
Other organisms
24.
Which terms best describe heterotrophs?
a)
Plants; producers
b)
Animals; producers
c)
Plants; consumers
d)
Animals; consumers
25.
Cat
a)
Autotroph
b)
Heterotroph
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