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Q 1/18
Score 0
How can you reduce energy transfer to or from a sample of water?
45
Use insulation to reduce energy transfer.
Use expansion to reduce energy transfer.
Use problem-solving skills to prevent energy transfer.
Use compression to reduce energy transfer.
Q 2/18
Score 0
What is an engineering design problem?
45
A challenge in which insulation is used to determine which provides the most energy transfer.
A challenge in which engineers create their own process to answer a problem.
A challenge in which scientists attempt to disprove a factual statement.
A challenge in which engineers must follow a specific process to answer a problem.
18 questions
Q.
How can you reduce energy transfer to or from a sample of water?
1
45 sec
Q.
What is an engineering design problem?
2
45 sec
Q.
Which explanation correctly explains dissolving?
3
45 sec
Q.
What is the average change in kinetic energy when something dissolves?
4
45 sec
Q.
What happens to the kinetic energy and bonds of molecules when substances melts?
5
45 sec
Q.
When kinetic energy is increased, which of the following two processes may occur?
6
45 sec
Q.
What is the difference between dissolving and melting?
7
45 sec
Q.
Which diagram represents a liquid?
8
45 sec
Q.
A chemical reaction involving 20 grams of water and 10 grams of alka seltzer takes place in a closed water bottle. What will be the total weight after the reaction (not including the bottle)?
9
45 sec
Q.
During a chemical reaction, what happens to the atoms?
10
45 sec
Q.
Energy transfers from particles of _____ energy to particles of _____ energy.
11
45 sec
Q.
A compound is made of _____ elements.
12
45 sec
Q.
O2 (little two!) is how many atoms of oxygen?
13
45 sec
Q.
H2O is how many atoms?
14
45 sec
Q.
4CO2 (little two!) is how many molecules?
15
45 sec
Q.
Which chemical formula may be represented by the model?
16
45 sec
Q.
Citric acid and baking soda react chemically. When the reaction stops, a small amount of citric acid added to the baking soda causes a reaction to continue. Which substance is an excess?
17
45 sec
Q.
The _____ is the reactant present in the lowest amount
