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slava [35]
3 years ago
8

Record all your observations about the candle. A good goal is 30 observations

Chemistry
1 answer:
Aliun [14]3 years ago
6 0

Answer:

read the explanation, but could be physical or chemical properties, extensive or intensive.

Explanation:

some of this observations could be a physical property (the one can be collected by the senses) or a chemical property (the one that can be collected by experience):

1.- It has a certain color.

2.- It has a definite shape.

3.- It has length.

4.- It has width.

5.- Is a solid body.

6.- Has a certain odor.

7.- It feels slippery.

8.- It has  a definitive weight.

9.- It has  a definite volume.

10.- It posses a certain density.

11.- It tastes waxy.

12.- It burns with help of the candlewick.

13.- It emits heat when it burns.

14.- The flame has a certain color.

15.- The flame has a certain temperature.

16.- It reacts with the air to start combustion.

17.- It changes the state of matter from solid to liquid.

18.- The flame emitted light.

19.- The flame changes color.

20.- The flame can attract smoke from another burning source.

21.- The flame change its longitude by passing the time.

22.- The size change trough the time.

23.- The volume change trough the time.

24.- The wax can not be dissolved in water.

25.- The wax can be dissolved in organic solvents.

26.- The light of the flame could change trough the time.

27.- The flame can emitted a black smoke.

28.- The candle can pass heat to the surface that is in contact.

29.- The candle when it burns emitted a sound.

30.- The candle can be reflect in another surface producing some shades.

Hope this info is useful.

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What is the percentage error of length measurement of 0.229cm if the correct value is 0.225cm
Mars2501 [29]

Percent error is the difference between the measured and known value, divided by the known value, multiplied by 100%.

So first, we take our measured value, .299 cm, minus our known value, .225 cm.

.299 cm - .225 cm=.004 cm

Next, we divide that by our known value

\frac{.004}{.225}=.0177777778

Finally, multiply your answer by 100

.0177777778 x 100= 1.77777778 %

Round to three significant figures, and you're done.

=1.78 % error



5 0
4 years ago
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Electrolytic cells use electricity to cause a nonspontaneous redox reaction to occur. An electrolytic cell is constructed using
Fittoniya [83]

Answer:

At anode - {Br_2}_{(l)}

At cathode - {H_2}_{(g)}

Explanation:

Electrolysis of NaBr:

Water will exist as:

H_2O\rightleftharpoons H^++OH^-

The salt, NaBr will dissociate as:

NaBr\rightarrow Na^++Br^-

At the anode, oxidation takes place, as shown below.

{Br^-}_{(aq)}\rightarrow {Br_2}_{(l)}+2e^-

At the cathode, reduction takes place, as shown below.

2{H^+}_{(aq)}+2e^-\rightarrow {H_2}_{(g)}

4 0
3 years ago
Sprinkler powder on the carron board _________ friction​
VARVARA [1.3K]

Answer:

Sprinkling of powder on the carom board <u>reduces</u> friction.

5 0
3 years ago
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How does the law of conservation of mass apply to this reaction:Mg + 2HCl → H2 + MgCl2?
krok68 [10]
The law of conservation of mass applies to every reaction. In this case, you start with 1 Mg, 2 H, and 2CL and end up with the same five only their bonds have been rearranged, or in other words, they are joined up differently.
5 0
3 years ago
- How much power does it take to lift a<br> 1,000 N load 10 m in 20 s?
Mariana [72]

Answer:

"500 Joule/sec" is the right answer.

Explanation:

The given values are:

Force,

F = 1000 N

Velocity,

s = 10 m

Time,

t = 20 s

Now,

The power will be:

=  \frac{Force\times Velocity}{Time}

On putting the values, we get

=  \frac{1000\times 10}{20}

=  \frac{10000}{20}

=  500 \ Joule/sec

5 0
3 years ago
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