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3 years ago

The first method of determining the chemical composition of substances in space was to _____.

1 answer:

5 0

Answer:The first method to determine the chemical composition of a substance in space was using light. By determining red shift in the observed spectrum of light they could determine the elements they were observing

Explanation:

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A 0.00100 moles sample of ca(oh)2 requires 25.00 ml of aqueous hcl for neutralization. how many moles of acid are contained in t

mr Goodwill [35]

The balanced chemical equation for the reaction is as follows;
Ca(OH)2 + 2HCl —> CaCl2 + 2H2O
The stoichiometry of Ca(OH)2 to HCl is 1:2.
Number of Ca(OH)2 moles reacted = 0.00100 mol
Therefore number of HCl moles that should react with base is double the amount of moles of base reacted.
Number of acid moles in 25.00 ml
= 0.00100 mol x2 = 0.00200 mol
Correct answer is 0.002 mol

7 0

3 years ago

Aeronautical researchers have developed three different processes to pack a parachute. They want to compare the different proces

vovangra [49]

The best design for this experiment is to number the items from 1 to 1,200 and then choose random numbers in the table of random digits (second option).

<h3>How to use a table of random digits?</h3>

These tables are used to randomly assign items or subjects into groups when experimenting. The best way to use these tables are:

Give each item or participant a number.
Take a lot at the table and choose a number.
If this number is the same that the number assigned to an item or participant classify it in the first group.
Keep selecting.

Based on this, for this experiment the steps are:

Number the items from 1 to 1,200.
Identify numvers in the table.
Assign the first 400 items to the process 1 group.
Repeat the process for the other two groups.

Learn more about experiments in: brainly.com/question/11256472

#SPJ1

3 0

2 years ago

Burning something is always a chemical change that requires a fuel and

Misha Larkins [42]

C . oxygen
i had this the other day

8 0

2 years ago

Read 2 more answers

Sevin, the commercial name for an insecticide used to protect crops such as cotton, vegetables, and fruit, is made from carbamic

xeze [42]

Answer:

Explanation:

Ratio of mass of C , N , H and O

= .8007 :0.9333:0.2016:2.133

Ratio of moles of C , N , H and O

= .8007/12 : .9333 / 14 : 0.2016 / 1 : 2.133/16

= .0667 : .0667: .2016 : .1333

= .0667 / .0667 : .0667 / .0667 : .2016 /.0667 : .1333 / .0667

= 1 : 1 : 3: 2

Hence empirical formula = CNH₃O₂

7 .

Weight of titanium Ti = 1.916 g

Weight of oxygen = 3.196 - 1.916 = 1.28 g

Ratio of weight of Ti and O

= 1.916 : 1.28

Ratio of moles of Ti and O

1.916/48 : 1.28/16 [ Molecular weight of Titanium is 48 ]

= .04 : .08

= .04/.04 : .08/.04

= 1 :2 .

Empirical formula

TiO₂

5 0

2 years ago

Does ecstasy drug effect how long you live?

const2013 [10]

Answer:

yes it gives some bad effect

Explanation:

6 0

2 years ago