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