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4 years ago

Nitrogen is not a vital component of life on Earth. a. True b. False

Chemistry

1 answer:

avanturin [10]4 years ago

3 0

I believe it’s false since All living things need nitrogen to make essential molecules like proteins and DNA.

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The diameter of a carbon atom is 1.54 å. (a) express this diameter in picometers. (b) how many carbon atoms could be aligned sid

makkiz [27]

Answer: -

(a) 1.54 x 10² pm

(b) 1.3 x 10⁶ is the number of carbon atoms could be aligned side by side in a straight line across the width of 0.2 mm.

Explanation: -

1 å = 10² pm

Diameter of a carbon atom = 1.54 å = 1.54 x 10² pm

1 mm = 10⁹ pm

Total distance = 0.2 mm = 0.2 x 10⁹ pm

Number of carbon atoms could be aligned side by side in a straight line across the width = Total distance / Diameter of a carbon atom

= $\frac{0.2 x 109 pm}{1.54 x 102 pm}$

= 1.3 x 10⁶

6 0

3 years ago

If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the conce

guapka [62]

Answer:

$M_{K^+}=4.0M \\\\M_{SO_4^{2-}}=2.0M$

Explanation:

Hello!

In this case, since the molarity of a solution is defined as the moles of solute divided by the volume of solution liters, given the mass of potassium sulfate, we can compute the moles by using its molar mass (174.24 g/mol):

$n_{K_2SO_4}=87gK_2SO_4*\frac{1molK_2SO_4}{174.27gK_2SO_4} =0.50molK_2SO_4$

Thus, since one mole of potassium sulfate has two moles of potassium ions (K₂) and one mole of sulfate ions, we can compute the moles of each ion as shown below:

$n_{K^+}=0.50molK_2SO_4*\frac{2molK^+}{1molK_2SO_4}=1.0molK^+\\\\ n_{SO_4^{2-}}=0.50molK_2SO_4*\frac{1molSO_4^{2-}}{1molK_2SO_4}=0.50molSO_4^{2-}\\$

In such a way, the molarity of each ion turns out:

$M_{K^+}=\frac{1.0mol}{0.250L}=4.0M \\\\M_{SO_4^{2-}}=\frac{0.5mol}{0.250L}=2.0M$

Best regards!

5 0

3 years ago

What is the total number of electrons in As-3?

V125BC [204]

Answer:

Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3

Explanation:

5 0

3 years ago

Indicate which solution in each pair has the lower pH. Your response should be a four letter "word". The first letter should be

JulijaS [17]

Answer:

bcfh

Explanation:

HClO₄ reacts with water thus:

HClO₄ + H₂O → H₃O⁺ + ClO₄⁻

That means HClO₄ produce H₃O⁺ that decreases pH. That means the higher concentration of HClO₄ decreases pH. Thus, lower pH will be:

b) 0.2 M HClO4

The reaction of NaClO₄ is:

NaClO₄ + H₂O → OH⁻ + HClO₄ + Na⁺

The higher concentration of NaClO₄ the higher production of OH⁻ that increase pH, that means the lower concentration of NaClO₄ the lower pH, thus, the answer is:

<em>c) 0.1 M NaClO or</em>

HF reacts with water thus;

HF ⇄ H⁺ + F⁻

The equilibrium constant is:

k = [H⁺] [F⁻] / [HF] = 3,5x10⁻⁴

For HNO₂ equilibrium is:

HNO₂ ⇄ H⁺ + NO₂⁻

k = [H⁺] [NO₂⁻] / [HNO₂] = 4,5x10⁻⁴

As k value is higher for HNO₂, the concentration of H⁺ will be higher in this system doing the HNO₂ with the lower pH.

f) 0.1 M HNO2

NaOH is a strong base that produce OH⁻ that increase pH, pure water is neutral, thus, the lowe pH is:

h) pure water

I hope it helps!

7 0

4 years ago

Help me please i need the answer now<br>(nonsense report)

rusak2 [61]

Answer:

Quantitative

Words, Measurement, Numbers, Charts, Instruments, Quantity, Data

Qualitative

Touch, Quality, Hear, Senses, Description, Exact, Narrative, Analyze

Explanation :

Quantitative Data

Can't measure
Has numerical value
Can campare
Do not depend on human eye

Qualitative Data

Can't measure
Don't have numerical value
Can't campare
Depend on human eye

3 0

3 years ago