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Q 1/37
Score 0
When food is placed in a refrigerator it cools. Is this an endothermic reaction?
30
no, because it is an exothermic reaction
no, because there is no chemical change happening
yes, because the heat from the food is removed by the refrigeration system and put into the outside air
yes, because cooling causes a chemical change in the food
Q 2/37
Score 0
Thermal energy is transferred from _______________________ to ______________________.
30
areas of lower energy...areas of higher energy
areas of higher energy...areas of lower energy
areas of cold...areas of warm
areas of less molecular movement...areas of more molecular movement
37 questions
Q.
When food is placed in a refrigerator it cools. Is this an endothermic reaction?
1
30 sec
Q.
Thermal energy is transferred from _______________________ to ______________________.
2
30 sec
Q.
In a chemical reaction, energy is needed to
3
30 sec
Q.
Which statement about atoms and molecules is correct?
4
30 sec
Q.
Endothermic reactions occur when
5
30 sec
Q.
Exothermic reactions occur when
6
30 sec
Q.
We can tell that a chemical reaction has occurred by
7
30 sec
Q.
Hand warmers use what kind of reaction to produce heat?
8
30 sec
Q.
The source of the thermal energy [heat] that is given off during an exothermic reaction is
9
30 sec
Q.
During photosynthesis, plants store energy from _________________ as ____________________.
10
30 sec
Q.
Precipitates are
11
30 sec
Q.
What are the ingredients for photosynthesis?
12
30 sec
Q.
Suppose you were shown a graph showing the temperature change over time in a chemical reaction. The graph shows a upward line as time elapses [goes past]. What kind of reaction is this?
13
30 sec
Q.
Energy cannot be
14
30 sec
Q.
A reactant is
15
30 sec
Q.
When a chemical reaction needs energy from the environment to break the bonds of the reactants it is a/an
16
30 sec
Q.
The energy released during an exothermic reaction comes from
17
30 sec
Q.
Carbohydrates are made up of repeating groups made from
18
30 sec
Q.
During an exothermic reaction, energy
19
30 sec
Q.
Conservation of energy
20
30 sec
Q.
A product is
21
30 sec
Q.
Energy is
22
30 sec
Q.
To insulate something means
23
30 sec
Q.
A conductor is
24
30 sec
Q.
Thermal energy is
25
30 sec
Q.
Matter can be lost or destroyed in what kind of chemical reaction?
26
30 sec
Q.
Temperature is
27
30 sec
Q.
The best definition of the term heat is
28
30 sec
Q.
Suppose you were shown a graph showing the temperature change over time in a chemical reaction. The graph shows a downward line as time elapses [goes past]. What kind of reaction is this?
29
30 sec
Q.
Thermal energy travels from
30
30 sec
Q.
Suppose you were shown a graph showing the temperature change over time in a chemical reaction. The graph shows a downward line as time elapses [goes past]. What kind of reaction is this?
31
30 sec
Q.
Thermal energy
32
30 sec
Q.
An endothermic reactions is
33
30 sec
Q.
In an object or substance, thermal energy moves
34
30 sec
Q.
Thermal energy in an object
35
30 sec
Q.
The more particles [mass] an object has the more thermal energy that object has
