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LTMS 8th Grade Chemical Reactions Flashcards | StudBud
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LTMS 8th Grade Chemical Reactions
LTMS 8th Grade Chemical Reactions
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#chemicalreactions#balancingequations
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Questions
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Answers
1
Does the equation follow the Law of Conservation of Mass?
no
yes
2
Signs of chemical change include color change, gas production, light production,
temperature change, perspiration
temperate, perspiration
temperature change, precipitate
tempura, precipitate
3
In the equation the arrow means
equals
creates
yields
turns into
4
How many different elements are in the compound: COFeHFCoBF
11
10
7
8
5
Which part of the atom has a positive charge?
electron
neutron
proton
nucleus
6
The molecular formula for caffeine is C
8
H
10
N
4
O
2
How many atoms of Hydrogen?
2
4
10
8
7
The following diagram is a molecule of Ammonia. what is the formula for Ammonia?
N5H4
N10H3
NH3
N8H3
8
Which part of the atom has a neutral charge?
proton
electron
neutron
nucleus
9
Which of the following is a compound?
Co
Fe
CO
He
10
2Ca + O
2
---> 2CaO In the Equation, what is the coefficient of the oxygen molecule?
1
2
3
0
11
New substances that are formed during a chemical equation are
on the left side of equation and are called reactants.
on the right side of equation and are called products.
on the right side of equation and are called reactants.
on the left side of equation and are called products.
12
The model represents Carbon. What is mass of the atom?
36 amu
6 amu
18 amu
12 amu
13
Where can most of the mass of the atom be found
in the electrons
in the nucleus
in the protons
in the neutrons
14
Which is NOT an example of a chemical change?
burning wood
water boiling on a stove
fireworks
rust forming
15
Which part of the atom has a negative charge?
proton
neutron
nucleus
electron
16
Which of the following equations follows the Law of Conservation of Mass?
NH3 + O2 ---> NO + H2O
Al + O2 ---> Al2O3
2H2 + O2 ---> 2H2O
N2 + H2 ---> NH3
17
2Ca + O
2
---> 2CaO In the Equation, what is the subscript of the oxygen molecule?
3
0
1
2
18
In chemistry, an atom can best be defined as
2 or more combinded elements
different forms of elements
smallest unit of an element
particles inside the nucleus
19
In the equation the __________ are on the left of the arrow and the _________are on the right.
products, yields
products, reactants
yields, products
reactants, products
20
The same number of atoms of each of the elements must be found in the reactants and products
Law of Motion
Law of Conservation of Mass
Law of Superposition
Law of Conservation of Energy
