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Leokris [45]
2 years ago
10

QUESTION 3 and 4 please

Chemistry
2 answers:
Katena32 [7]2 years ago
8 0

Answer:

The answer to question 3 should be C. Summarizing the results.
The answer to question 4 should be D. Comparing data from the experiment to the prediction of the hypothesis.

Explanation:

Rashid [163]2 years ago
5 0

Answer: For question 3 Your answer will be C

For question 4 your answer will be D

Explanation:

this is because this part of a scientific hypothesis and cycle.

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3 years ago
Which of Hubble's findings supported the big bang theory? Check all that apply.
grigory [225]

<u>Out of all given options, Hubble's findings supported the big bang theory are as follows: </u>

  • The universe formed from a central point.
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  • There are billions of galaxies in the universe, not just one.

Option C, D, and E

<u>Explanation: </u>

According to big bang theory, the universe is increasing its region of occupancy in free space. As it is known that the universe is composed of several galaxies. So this spreading of the universe is nothing but spreading of galaxies.

And this is confirmed from Hubble’s findings using Hubble’s telescope.  As they have observed that the speed at which the galaxies are travelling in free space has been increased at a faster rate.

So, the galaxies are used to move away from Earth with time at a faster rate which confirms the big bang theory of universe formation. Also, in simple words, universe started from big bang according to cosmology' standard theory, it’s just moves from everything else.

3 0
3 years ago
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Which carboxylic acid can be combined with an alcohol to form the ester shown below?
Anna11 [10]

Answer:

CH₃CH₂CH₂COOH.

Explanation:

To know which option is correct, let us hydrolysed the given ester. This is illustrated in the attached photo.

Hydrolysis of ester involves breaking the ester bond by a water molecule to produce the corresponding alcohol and carboxylic acid.

From the reaction given in the attached photo, we can see that the carboxylic acid needed to produce the desired ester is butanoic acid, CH₃CH₂CH₂COOH.

7 0
3 years ago
Why is it important to compare the positive and negative test results with those of known compounds?
maks197457 [2]

It is important to compare the positive and negative test results with those of known compounds as positive results indicate the presence of that known compound and negative results indicate the absence of that compound which is used for reference.

<h3>What is qualitative analysis?</h3>

Qualitative chemical analysis is a method to determine the chemical composition of a sample.

There are two types of qualitative analysis:

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  • Inorganic qualitative analysis: It helps in determining the ions in the given sample

There are seven ways to analyze a sample qualitatively, which are

  • Change in color
  • Flame test
  • Distillation
  • Extraction
  • Precipitation
  • Chromatography
  • Spectroscopy

A reference compound is always used to which results are compared.

A Positive result indicates that the reference compound is present in the sample whereas a negative result indicates that the reference compound is absent in the given sample.

Learn more about qualitative analysis:

brainly.com/question/1779681

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5 0
1 year ago
Question 1 Is the following question true or false All of today's continents were part of one large land mass 225 million years
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Question 1 is true because it was called Pangea

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3 years ago
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