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IrinaK [193]
3 years ago
12

Which statements accurately describe volume? Check all that apply.

Chemistry
2 answers:
allsm [11]3 years ago
7 0

Answer:

the answer is the number three

Nitella [24]3 years ago
3 0

Answer: the right answer is 1,4&5

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What is not a basic need of all organisms? <br> soil<br> water<br> food<br> air
dexar [7]

Answer:

soil

Explanation:

some organisms aren't plants

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2 years ago
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Five Biomedical Importance of Nucleotides
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Explanation:

BIOMEDICAL IMPORTANCE

In addition to serving as precursors of nucleic acids, purine and pyrimidine nucleotides participate in metabolic functions as diverse as energy metabolism, protein synthesis, regulation of enzyme activity, and signal transduction.

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What is the independent and dependent variable
MakcuM [25]
Independent- controlled in a scientific experiment to test the effects                  a dependent is being tested and measured in a scientific experimrent
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3 years ago
I NEED HELP PLEASE, THANKS! :)<br><br>Explain why ionic compounds are always polar.
evablogger [386]

Answer and Explanation:

Polar compounds are those that have an unequal sharing of electrons, causing one end to be more positively or negatively charged than the other end.

Ionic compounds are those that are made up of a positive ion and a negative ion. Clearly, we can see that if one ion is positive and the other is negative, then that would make one end of the compound more or less positively charged than the other end, which is exactly the definition of a polar compound.

That is why ionic compounds are always polar.

3 0
3 years ago
A 50.00 mL sample of groundwater is titrated with 0.0300 M EDTA . Of 12.40 mL of EDTA is required to titrate the 50.00 mL sample
Rzqust [24]

Answer:

7.44x10⁻³ mol/L and 744 ppm

Explanation:

Let's assume that the hardness of the water is totally from Ca⁺² ions only(the hardness is the measure of Ca⁺² and Mg⁺² ions). The titration with EDTA will form a complex. The EDTA is always in 1:1 proportion, so the number of moles of it will be the number of moles of Ca⁺², which will be the number of moles of CaCO₃.

n = 0.0124 L * 0.0300 mol/L

n = 3.72x10⁻⁴ mol

The molarity is the number of moles divided by the volume (0.05 L)

M = 3.72x10⁻⁴/0.05

M = 7.44x10⁻³ mol/L

1 part per million = 1 mg/L. The molar mass of the CaCO₃ is 100 g/mol, so the mass of it is:

m = 3.72x10⁻⁴ mol * 100 g/mol

m = 0.0372 g = 37.2 mg

Then, the ppm:

37.2/0.05 = 744 ppm

5 0
3 years ago
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