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2nd SW Warm Up 4
Contributed by: Ruble
1.Mrs. Davis was doing an experiment.  She mixed two substances together in a flask and noticed that the beaker became very cold.  Cold enough to form ice crystals on the outside of the beaker.  Mrs. Davis concluded that:
No type of reaction occurred
This may be evidence of a chemical reaction
A physical change occurred
He just discovered how freezers work
2.
Mrs. Ruble was doing a demonstration in class.  She 
began boiling a beaker of water on a hot plate.  Over 
a period of 5 minutes, students observed steam 
rising from the beaker and the level of water in the 
beaker had reduced from 200mL to 100mL.  This is
evidence of:
a chemical change 
no change has occurred
a change in the state of matter
there's no way to know what has occurred
3.During a lab experiment, two students observed a faint glow in the beaker.  Their substance began to change color and there was a slight odor detected.They concluded that they had just observed:
a new element being formed
a chemical reaction
an ionic bond between two covalent atoms
4.
Which of the following is NOT an example of a 
chemical change?
burnt toast
torn paper
sodium and water reacting
cooking eggs in a pan
Which of the following IS an example of
a chemical change?
5.
Walking your dog
fireworks exploding
a broken pencil
taking out the trash
6.To write a chemical symbol, the first letter is capitalized and any other letters are lowercase.
 True
False
Only in chemical formulas
7.How many chemical symbols (elements) are represented in the following formula:
            AgHNCaOPbCu
1
 7
11
4
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