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.
1 point
1
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…”
1 point
1
Question 4
4.
What can you change when balancing a chemical equation?
2 points
2
Question 5
5.
Balance the chemical equation.
4 points
4
Question 6
6.
Balance the chemical equation.
1 point
1
Question 7
7.
Balance this chemical reaction
P4O10 + __________H2O --> __________H3PO4
2 points
2
Question 8
8.
Relate the writing and balancing of a chemical equation to the law of
conservation of mass.
2 points
2
Question 9
9.
Will the mass of the sealed jar and its contents change as the candle burns?
2 points
2
Question 10
10.
Name the two types of energy given off by the burning candle and the combustion of methane gas.
2 points
2
Question 11
11.
Name the two substances given off by the burning candle and the combustion
of any fuel such as propane, coal or gasoline.
2 points
2
Question 12
12.
Which of the following is a supported claim about a burning candle?
1 point
1
Question 13
13.
After the candle burns, the remaining wax has ____ mass than the original candle because the rest of the original candle's mass ____.
2 points
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 points
2
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.
1 point
1
Question 16
16.
Which of the following is true of chemical equations?
