Magnesium burns with a brilliant white light and is used in pyrotechnics, flares and photographic flashbulbs. Magnesium is the lightest metal that can be used to build things, although its use as a structural material is limited since it burns at relatively low temperatures.
The chemical equation, 2MgO2 ---> 2MgO + O2 shows this reaction.
Fill in the appropriate symbols and models to determine if the equation is balanced or not.
Question 3
3.
A student named Aspen in a lab at UCLA was trying to synthesize ammonia using Nitrogen (N2) and Hydrogen (H2) gas.
Below is the chemical equation with results:
Was this student successful in creating a chemical reaction? How do you know?
How do you know that a chemical reaction has occurred.
Name at least 2 signs that a chemical reaction has occurred. If a chemical reaction has not occurred, explain why.
Sentence starters: “A chemical reaction did/did not occur.” My evidence for why a reaction did/did not occur is…”
Question 4
4.
Question 5
5.
Balance the chemical equation.
Question 6
6.
Balance the chemical equation.
Question 7
7.
Balance this chemical reaction
P4O10 + __________H2O --> __________H3PO4
Question 8
8.
Relate the writing and balancing of a chemical equation to the law of
conservation of mass.
2
2
2
2
1
2
Question 14
14.
Josh Moffit created the model above to explain what happens in a chemical reaction.
Examine the model and use what you know about chemical reactions to
A) Determine whether Josh’s model correctly explains that a chemical reaction conserves atoms. Support your answer using the model to describe the atoms that make up hydrogen, oxygen and water. Be sure to include the number and types of atoms for each moleculebeforeandafterheating.
2
Question 16
16.
Question 17
17.
Question 18
18.
Start Socrative:
Room Name: X5EB2CTM6
Type your score after
A balanced equation demonstrates...
Energy has neither been created or destroyed
There was an exothermic reaction
There is the same amount of atoms on both side of the equation
The law of conservation of mass
The law of conservation of energy
What can you change when balancing a chemical equation?
Catalyst
Coefficient
Subscript
Elements
Question 9
9.
Question 10
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Question 11
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Question 12
12.
Question 13
13.
Question 15
15.
Josh created a model above to explain what happens in a chemical reaction. He made the model above.Examine the above model and use what you know about chemical reactions to determine whether Josh’s model:
2. How does Joshua's model correctly explains thata chemical reaction produces a new substance. Support your answer using the model to describe the atoms that make up hydrogen, oxygen and water. Be sure to include the number and types of atoms for each moleculebeforeandafterheating.
Which of the following is true of chemical equations?
A Subscripts can be changed to have the same number of each type of atom on both
sides of the equation.
B Coefficients are used to have the same number of each type of atom on both
sides of the equation.
C The basic format for a chemical equation is Products ---> Reactants.
D A chemical equation represents a physical change that occurs.
Which of the following is a physical change?
A Sodium hydroxide pellets dissolving in water.
B Bubbles of hydrogen gas being produced.
C Hydrogen and oxygen combining to form water.
D Hydrogen gas catching on fire.
Will the mass of the sealed jar and its contents change as the candle burns?
A Yes, the mass will decrease as the candle burns and gets smaller.
B No, the mass will remain the same. It is a closed system.
C Yes, the mass will increase and smoke is made.
Name the two types of energy given off by the burning candle and the combustion of methane gas.
A carbon dioxide and oxygen
D heat and light
C chemical and light
B heat and chemical
Name the two substances given off by the burning candle and the combustion
of any fuel such as propane, coal or gasoline.
A carbon dioxide and oxygen
B carbon dioxide and water vapor
C water vapor and oxygen
Which of the following is a supported claim about a burning candle?
A burning candle is a chemical change because the candle wax is melting.
A burning candle is a chemical change because heat and light are given off.
A burning candle is a physical change because carbon dioxide and water vapor are formed.
A burning candle is a physical change because heat and light are given off.
After the candle burns, the remaining wax has ____ mass than the original candle because the rest of the original candle's mass ____.
