stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Chemical Reactions Flashcards | StudBud
Explore
/
Chemical Reactions
Chemical Reactions
35 terms
·
StudBud Administration
·
2,086 plays
Law of Conservation of Mass Balancing Equations Chemical Reactions
Flashcards
35 cards
F
Practice quiz
P
Host live
L
Questions
35
Answers
1
How many
elements
make up CaNO
3
?
2
3
7
5
2
What could bond with nitrogen?
2 helium atoms
5 carbon
3 flourine
1 hydrogen and 1 calcuim
3
How are compounds different from mixtures?
compounds are mixtures of elements
compounds are mixtures bonded together chemically
mixtures are bonded together chemically
compounds are different atoms bonded together chemically
4
The substances that are formed from a chemical reaction are called the...
products
reactants
coefficients
subcripts
5
Is this the correct dot diagram of oxygen?
no
yes
6
Which of the following statements best defines the law of conservation of mass?
Matter cannot be rearranged
Energy can destroy mass
Matter cannot be created but destroyed, and never rearranged
Matter cannot be created nor destroyed, just rearranged
7
According to a law, the mass of the reactants is equal to the
volume of the reactants
mass of the products
atoms in a compound
atomic mass of the elements
8
If an atom gains valence electrons from another atom, what kind of
ion
does it form?
neutral
ionic
positive
negative
9
If Na, bonds to Cl, what kind of bond will form?
ionic
covalent
metallic
ironic
10
Which is a diatomic molecule?
H2O
H2
2H2O
CO2
11
What happens in a chemical reaction?
Atoms are created.
Atoms are heated and cooled.
Atoms are rearranged.
Atoms are destroyed
12
2NaCl + H
2
O → Cl
2
+ H
2
+ 2NaOH: Which substances are the reactants?
2NaCl and H20
Cl2 and H2
H20 and Cl
2NaOH, H2, and Cl2
13
What chemistry "rule" must atoms follow when filling their valence shells by bonding to other atoms?
matter cannot be created or destroyed
the reactants rule
the rule of the universe
the octet rule
14
Nonmetals bonded to nonmetals will tend to produce _______bonds between them.
ionic
codependent
ironic
covalent
15
How many valence electrons does carbon have?
7
5
3
4
16
Where is a reactant located in a chemical reaction?
To the right of the addition sign
To the right of the arrow
To the left of the arrow
To the left of the addition sign
17
Which is not a compound?
N2
CO2
NaCl
C6H12O6
18
If a carbon bonds to a hydrogen and to an oxygen, what kind of bonds will form?
covalent bonds
ionic bonds
oxide bonds
hydrogen bonds
19
This the correct Lewis dot diagram for boron. (in 3A)
True
False
20
The number in front of a chemical formula tells us how many molecules of a compound is present. This is called a...
coefficient
subscript
reactant
chemical symbol
21
The "2" is a subscript in 2NaCl
False
True
22
Who developed the Law of Conservation of Mass?
Dmitri Mendeleev
Antoine Lavoisier
Isaac Newton
Nikola Tesla
23
In a chemical reaction, a release of energy is a sign that...
a physical change has just occurred.
neutrons are bonding with protons
electrons are bonding with protons
a chemical change is taking place
24
If one atom loses electrons, and another atom gains those electrons, what type of bond will form?
iconic
codependent
covalent
ionic
25
If a chemical symbol in a chemical formula has a subscript of 3, it means...
the chemical formula has a charge of +3
3 molecules of that formula
3 atoms of that element at the left of it
the "3" is for both elements
26
Atoms will bond with other atoms until they have how many electrons in the outer energy shell? (except for two elements)
5
8
1
3
27
In a covalent bond, atoms share a pair of electrons.
False
True
28
Substances that are brought together before a chemical reaction are called the ...
a reactants
chemicals
a products
enzymes
29
If an atom loses its valence electrons to another atom, what kind of
ion
does it become?
lost
negative
covalent
positive
30
Which has 6 valence electrons?
sodium (Na)
neon (N)
Chlorine (Cl)
oxygen (O)
31
What are the products of this reaction?
2H2 and O2
2H2 and 2H2O
2H2O
H2O and CO2
32
Two elements will never reach an octet by bonding. The max they will get to is two.Which are they?
boron and hydrogen
helium and neon
Hydrogen and boron
hydrogen and helium
33
How many atoms are in FeO
2
?
5
2
3
4
34
Members of group 1A would easily bond with what other group forming an octet?
7A
5 members of 2A
4 members of 6 A
8A
35
How many atoms are in Mg(SO
4
)
3
?
12
20
3
16
