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No Over Reacting about... Chemical Equations and Reactions Flashcards | StudBud
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No Over Reacting about... Chemical Equations and Reactions
No Over Reacting about... Chemical Equations and Reactions
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Chemical Equations and Reactions
Flashcards
30 cards
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Practice quiz
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Host live
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Questions
30
Answers
1
Energy, in the form of heat, is a reactant in ___________ reactions.
Isothermic
Endothermic
Thermal underpants
Exothermic
2
Which of the following is not an example of an element?
Hydrogen
Oxygen
Sodium
Sodium hydroxide
3
What side of the equation has the resulting compound?
Right
Left
Every side, duh!
4
How many total elements are in the given chemical equation?
5
4
2
3
5
Which of the following is a physical change?
Cutting
Temperature increase
Production of bubbles
An explosion
6
A solid substance is dissolved into water, what chemical reaction has occured?
Color Change
Light Production
Precipitate Formation
No Chemical change occured
7
What does subscript mean?
The total atoms in the equation
The number of atoms for the element
The amount of products for the elements
Them number of molecules for the element
8
When mixing milk and vinegar, what was an indicator that a chemical reaction occurred?
Precipitation formed
Hopefully you read carefully
This is not a smart choice
Precipitate formed
9
Is the following equations balanced or unbalanced?
Balanced
I'm confused
Unbalanced
10
Describe the following Chemical Reaction, H
2
O
2
--> O
2
+ H
2
?
Hydrogen and Oxygen combine with Hydrogen Peroxide
Hydrogen Peroxide breaks down into Oxygen and Hydrogen
Oxygen and Hydrogen combine to make Hydrogen Peroxide
Hydrogen Peroxide combines with Oxygen and Hydrogen
11
Which of the following is not a chemical reaction?
Precipitate formation
Tearing
Gas Production
Temperature change
12
How many atoms are in the Hydrogen molecule below?
2
1
3
4
13
What would best classify the reactants side of the following equation?
1 compound and molecule 1 element molecule
2 compound molecules
2 compounds
2 elements
14
Which equation below follows the Law of Conservation of Mass?
2H2 + C --> CH4
2H2 + C --> 2CH2
2H2 + C --> 2CH4
2H2 + --> CH2
15
What cannot be separated easily?
Compound
Mixture
Element
16
What identifies an element?
Protons
Subscripts
Products
Coefficients
17
The mass of the reactants must equal the mass of the products according to...
The Law of Conservation of Chemistry
The Law of because your teacher told you so
The Law of Conservation of Mass
They do not have to be equal
18
Which of the following is true about the equation below?
The reactants break apart
It follows the Law of Conservation of Mass
Both sides have similar chemical properties
The products has more elements than the reactants
19
Which of the following answers has all signs of chemical reactions?
Color, Gas, Precipitate, Light, No Temperature Increase
Color, Gas, Light, Temperature, Flavor
Color, Gas, Light, Temperature, Precipitate, Smell
Color, Gas, Light, Temperature, Dissolving
20
Which of the following is true about the graphic below?
the chemical equation is unbalanced
the product will always have more atoms than the reactant
The reactant will always have more atoms than the product
both the reactant and product will have equal # of atoms
21
What is the subscript of the Oxygen molecule?
3
4
2
1
22
What does coefficient mean?
Number of chemical formulas
The total atoms in the equation
Number of substance molecules
Number of atoms for the element
23
How many total atoms are in the following Chemical Formula?
2
5
9
7
24
Which of the following does not represent a chemical property?
Ability to catch on fire
Ability to react with acid
Ability to react with oxygen to rust
Ability to change state
25
How many Hydrogen atoms are in the chemical formula below?
1
5
6
2
26
Which side of the chemical equation shows substances before a chemical reaction occurs?
Reactant
Coefficient
Product
Subscript
27
How many elements are present in 2Na
2
CO
3
?
12
2
4
3
28
What is a precipitate?
Gas
Metalloid
Liquid
Solid
29
Which of the below examples represents a chemical reaction?
a
b
30
How do you identify a substance?
Equation
Formula
Subscript
Coefficient
