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kaheart [24]
3 years ago
8

In science class, Harry and his classmates are performing a controlled scientific investigation. The teacher has already picked

a topic and testable question for the class to study and has provided background research on the topic.
Before performing the investigation, the students must first
A.
form a hypothesis to predict the outcome of the investigation.
B.
analyze the data that results from the investigation.
C.
record data from the investigation in graphs and charts.
D.
communicate the results of the investigation with the teacher.
Chemistry
2 answers:
Snowcat [4.5K]3 years ago
6 0

A is the correct answer

miv72 [106K]3 years ago
4 0

The steps of research follow the sequence as

a) make an observation

b) Propose a hypothesis for the observation made

c) Prediction of the correctness of hypothesis

d) Perform experiment

e) conclude the problem

So answer is

i) record data from the investigation in graphs and charts.

ii) form a hypothesis to predict the outcome of the investigation.

iii) analyze the data that results from the investigation

iv) communicate the results of the investigation with the teacher.



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What changes in trade did Europeans hope to bring about by finding sea routes to Asian markets?
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Answer:

controlled by the Arabs, who brought frankincense and myrrh by camel caravan from South Arabia.

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3 years ago
If i have 8 L of 0.25 M solution, how many miles of MgCl2 are present
qaws [65]

Answer:

2 moles

Explanation:

The following were obtained from the question:

Molarity = 0.25 M

Volume = 8L

Mole =?

Molarity is simply defined as the mole of solute per unit litre of solution. It is represented mathematically as:

Molarity = mole of solute/Volume of solution.

With the above equation, we can easily find the number of mole of MgCl2 present in 8 L of 0.25 M MgCl2 solution as follow:

Molarity = mole of solute/Volume of solution.

0.25 = mole of MgCl2 /8

Cross multiply to express in linear form

Mole of MgCl2 = 0.25 x 8

Mole of MgCl2 = 2 moles

Therefore, 2 moles of MgCl2 are present in 8 L of 0.25 M MgCl2 solution

4 0
3 years ago
Which planet is terrestrial?<br> Jupiter<br> Mars<br> O Saturn<br> Uranus
Zolol [24]

Answer: Mars

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4 0
2 years ago
Read 2 more answers
Acetylene gas (ethyne; HC = CH) burns in an oxyacetylene torch to produce carbon dioxide and water vapor. The heat of reaction f
Yanka [14]

The mass of CO2 produced by 26g of acetylene is 88g.

Given ,

In an oxyacetylene torch, acetylene gas (ethyne; HCCH) burns to produce carbon dioxide and water vapour.

The acetylene combustion reaction is given by,

H2O + HCCH + 5/2 O=O 2CO2

Heat of reaction for acetylene combustion = 1259kj/mol

CO2 has a molecular mass of 44g/mol.

2 moles of CO2 have a molecular mass of 88g.

On combustion, 1 mole of acetylene yields 2 moles of CO2.

Thus, 26g of acetylene produces 88g of CO2 when burned.

As a result, the mass of carbon dioxide produced by 26g of acetylene is 88g.

Learn more about acetylene here :

brainly.com/question/15346128

#SPJ4

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1 year ago
Standard temperature and pressure are _____.
Maurinko [17]
The standard temperature is 0c.
the standard pressure is 1atm.
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