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Makovka662 [10]
3 years ago
14

Why do scientist record observations during an experiment?

Chemistry
1 answer:
Sloan [31]3 years ago
3 0

Observation is more than simply noticing something. ... Observation is essential in science. Scientists use observation to collect and record data, which enables them to construct and then test hypotheses and theories.

You might be interested in
What is the percentage of lithium in lithium carbonate (Li2CO3)?
ale4655 [162]
Molar mass Li2CO3 = 73.89 g/mol
Molar mass Li = 6.94g/mol Li = 6.94*2 = 13.88g


% LI = 13.88/73.89*100 = 18.78% perfectly correct.
6 0
2 years ago
Read 2 more answers
Question: convert 22.63 miles of oxygen to volume<br><br> very urgent
Stels [109]

Answer:

506.912 L

Explanation:

From the question given above, the following data were obtained:

Number of mole of O₂ = 22.63 moles

Volume of O₂ =?

Recall:

1 mole of a gas occupy 22.4 L at STP.

With the above information, we obtained the volume occupied by 22.63 moles of O₂ as follow:

1 mole of O₂ occupied 22.4 L at STP.

Therefore, 22.63 moles of O₂ will occupy = 22.63 × 22.4 = 506.912 L at STP.

Thus, 22.63 moles of O₂ is equivalent to 506.912 L.

3 0
2 years ago
What type of reaction takes place when melting a solid
Readme [11.4K]
It turns into liquid
6 0
3 years ago
Read 2 more answers
GIVING THE BRAINLIEST
Allushta [10]

The correct answer is A. Charging by friction

Explanation

When someone rubs a comb with their hair when they are combing it and the hair sticks to the comb occurs a phenomenon called electrization, in which a neutral body becomes charged or loses an electrical charge (electrons). One way that electrization occurs is through the rubbing of two neutral bodies which causes one to be positively charged and the other negatively causing them to attract each other by magnetism. Therefore, the correct answer is A. Charging by friction

4 0
3 years ago
New research shows that a red food colouring with an R value of 0.62 (when a particular solvent and temperature are used) could
svlad2 [7]

It is recommended only for the second type of candy to be taken off the market.

Based on the background information, if a candy shows a 0,62 Rf value in the chromatography it is considered potentially dangerous, and therefore it should be taken off the market.

The Rf value is calculated using the following formula:

  • Rf =  Total distance traveled by a component/ Total distance from the pencil line to the solvent front

Now, let's find out if any of the components has an Rf equal to 0,62.

Note: To determine the distances I measured the image using a ruler and you can do the same, this will not alter the results.

  1. Sample 1
  • Total distance traveled by the component: 6cm
  • Total distance: 7 cm
  • Rf : 6 cm/ 7 cm = 0.85

     2. Sample 2

  • Total distance traveled by the component: 4.34cm
  • Total distance: 7 cm
  • Rf : 4.34 cm/ 7 cm = 0.62

This means sample 2 has the 0.62 Rf value and therefore it needs to be taken off the market.

Learn more about chromatography in: brainly.com/question/10296715

3 0
2 years ago
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