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Ede4ka [16]
3 years ago
13

Why is it important to use standard measurements and units in science

Chemistry
1 answer:
saul85 [17]3 years ago
6 0

Unit' is the word used to describe how something is measured. When researching a question in science, we collect data, interpret it, and share the results with other scientists. A common measurement system allows us to make direct comparisons instead of having to know things like how much a certain animal weighs.

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The picture shows a natural environment.
Marta_Voda [28]

Answer: The answer is B

Explanation: cause the bush and cactus are plants and they are living things and rat and snake are animal which is also living thing

6 0
3 years ago
Read 2 more answers
How many moles of h2 can be formed if a 3.25g sample of Mg reacts with excess HCl
kogti [31]

Answer:

0.134 moles of H₂ can be formed if a 3.25g sample of Mg reacts with excess HCl

Explanation:

The balanced reaction is:

Mg + 2 HCl → MgCl₂ + H₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles react:

  • Mg: 1 mole
  • HCl: 2 moles
  • MgCl₂: 1 mole
  • H₂: 1 mole

Being:

  • Mg: 24. 31 g/mole
  • H: 1 g/mole
  • Cl: 35.45 g/mole

the molar mass of the compounds participating in the reaction is:

  • Mg: 24.31 g/mole
  • HCl: 1 g/mole + 35.45 g/mole= 36.45 g/mole
  • MgCl₂: 24.31 g/mole + 2*35.45 g/mole= 95.21 g/mole
  • H₂: 2*1 g/mole= 2 g/mole

Then, by stoichiometry of the reaction, the following quantities of mass participate in the reaction:

  • Mg: 1 mole* 24.31 g/mole= 24.31 g
  • HCl: 2 moles* 36.45 g/mole= 72.9 g
  • MgCl₂: 1 mole* 95.21 g/mole= 95.21 g
  • H₂: 1 mole* 2 g/mole= 2 g

Then you can apply the following rule of three: if by stoichiometry 24.31 grams of Mg form 1 mole of H₂, 3.25 grams of Mg how many moles of H₂ will they form?

moles of H_{2} =\frac{3.25 grams of Mg*1 mole of H_{2} }{24.31 grams of Mg}

moles of H₂= 0.134

<u><em>0.134 moles of H₂ can be formed if a 3.25g sample of Mg reacts with excess HCl</em></u>

7 0
4 years ago
Which kind of molecule is used by organisms to store and transmit genetic material?
almond37 [142]

Answer:

Nucleic acids

Explanation:

Nucleic acids, macromolecules made out of units called nucleotides, come in two naturally occurring varieties: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material found in living organisms, all the way from single-celled bacteria to multicellular mammals like you and me.

6 0
3 years ago
Read 2 more answers
Is the number of particles in a substance directly proportional to the grams of a substance OR the
Cloud [144]

Answer: The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12

Explanation:

3 0
3 years ago
How do I determine the number of atoms in 30.0 g of K
Alika [10]

The number of atoms in 30.0 g of K would be 4.632  x 10^{23} atoms.

<h3>Avogadro's number</h3>

1 mole of a substance contains 6.022 x 10^{23} atoms.

Mole of 30.0 g of K potassium = 30/39

                                                       = 0.7692 moles

Hence, 0.7692 moles of K would contain

                     0.7692 x 6.022 x  10^{23} atoms.

                                = 4.632  x 10^{23} atoms.

More on Avogadro's number can be found here: brainly.com/question/1445383

                   

8 0
3 years ago
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