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Evidence of chemical change practice 2

Last updated over 4 years ago

32 questions

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Question 1

1.

During a chemical reaction the temperature of the combined substance increases and a solid is formed.

Physical change 

chemcial change

Question 2

2.

what is your evidence ?

Question 3

3.

when a solution od sodium sulfide and cadmium notrate are mixed , a solid yellow percipitate is formed.

physcial change 

chemcial change 

Question 4

4.

what is you evidence ?

Question 5

5.

During a chemical reaction one liquid settled at the bottom of the beaker and the other liquid rose to the top.

physcial change 

chemcial change 

Question 6

6.

what is your evidence ?

Question 7

7.

During a chemical reaction a clear liquid settle at the bttom of the beaker and the other liquid rose to the top.

physcial change 

chemcial change 

Question 8

8.

what is your evidence ?

Question 9

9.

Alka seltzer tablet produce bubbles.

physical change 

chemical change 

Question 10

10.

what is your evidence

Question 11

11.

Candle wax melting

physcial change 

chemical change 

Question 12

12.

what is your evidence

Question 13

13.

food coloring dropped into water to give it color .

physical change 

chemical change 

Question 14

14.

what is your evidence

Question 15

15.

paper caught fire

physical change 

chemical change 

Question 16

16.

what is your evidence

Question 17

17.

power2 poweder 1 =amonia odor

physcial change 

chemical change 

Question 18

18.

what is your evidence

Question 19

19.

powdery substance dissolved in water

physical change 

chemical change 

Question 20

20.

what is you evidence

Question 21

21.

During a chemical reaction , Temperature dropped dramatically after adding the liquid.

physical change 

chemical change 

Question 22

22.

what is your evidence

Question 23

23.

two liquids combining and a solid form

physical change 

chemical change

Question 24

24.

what is your evidence

Question 25

25.

colorless gass+colorless gass____brown gas

physical change 

chemical change

Question 26

26.

what is your evidence

Question 27

27.

blue solution+zinc blue solution__zinc in clear solution

physical change  

chemical change

Question 28

28.

what is your evidence

Question 29

29.

mixing salt and pepper

physical change 

chemical change 

Question 30

30.

what is your evidence

Question 31

31.

Baking soda absorb ydrochloric acid

chemical change 

physical change 

Question 32

32.

what is your evidence