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Chemical Changes and Reactions Test cloned 2018-12-13

Last updated almost 6 years ago
15 questions
Use the picture below to answer questions 1-5.
2

Will the mass of the sealed jar and its contents change as the candle burns?

2

Name the two types of energy given off by the burning candle and the combustion of methane gas.

2

Name the two substances given off by the burning candle and the combustion of any fuel such as propane, coal or gasoline.

2

Which of the following is a supported claim about a burning candle?

1

After the candle burns, the remaining wax has ____ mass than the original candle because the rest of the original candle's mass ____.

2

Josh created the model above to explain what happens in a chemical reaction.
Examine the above model and use what you know about chemical reactions to
1. determine whether Josh’s model correctly explains that a chemical reaction conserves atoms.
2. 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 molecule before and after heating.

2

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:
1. correctly explains that a chemical reaction produces a new substance.
2. 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 molecule before and after heating.

2

Relate the writing and balancing of a chemical equation to the law of conservation of mass.

1

Which of the following is true of chemical equations?

1

Which of the following is a physical change?

1

Which of the following statements about chemical equations is a false?

0

Go to NGSS website and complete the following:

Factory reaction (ID#: 021.03-c06) Take a screen shot and insert into the work space below.

Ted’s four silvery metals (ID#: 033.02-c01)

Ted found four pieces of metal. He thinks that two metals might be the same. Ted needs your help to know if he has two pieces of the same metal.
You measured the mass and volume, and calculated the density of each piece of metal that Ted found. The data for each piece of metal are in Table 1.
Table 1. Data for four pieces of metal
3

Write a scientific explaination about whether any of the pieces of metal are the same. Be sure to include:
1. a claim
2. evidence
3. reasoning

Milana mixing materials (ID#: 014.03-c02)

On lab day, Milana did an experiment the with two solids: potassium iodide and silver nitrate. Here is a video showing what Milana did: Mixing potassium iodide with silver nitrate solutions.
Milana measured and recorded the mass, solubility, melting point, and calculated the density of potassium iodide and silver nitrate before mixing and for Solid A after mixing. 
The results are in Table 1. 
Table 1: Data for substances before and after mixing
1

State whether a chemical reaction occurred or not by relating the starting sample and the final sample.

2

Support your claim with evidence and reasoning using information in the data table.