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2 years ago

URGENT, TEST DUE AT MIDNIGHT

Chemistry

2 answers:

sweet-ann [11.9K]2 years ago

5 0

Answer:

B is most volatile, A is least volatile

Explanation:

Varvara68 [4.7K]2 years ago

5 0

Answer:

<h3>B is most volatile, a is least volatile </h3>

Explanation:

<h3>I hope this helps u </h3><h3>have a nice day ✌❤☘</h3>

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Select all the correct images, select the two atomic models that belong to the same element.

Scrat [10]

Check the circled atoms in the attached diagram

Explanation:

The circled options all belongs to the same elements. They are simply isotopes.

Since:

Red ball = protons

Yellow ball = neutron

Blue ball = electron

The protons are positively charged and with the neutrally charged neutrons they both occupy the vicinity of the nucleus of an atom.

Electrons moves round the nucleus in orbits.

Atoms of the same elements have the same number of protons.

The circled options all have two protons.

The atoms only differ in the number of neutrons which signifies that they are merely isotopes.

More descriptively, the atoms are Helium atoms.

learn more:

Isotope brainly.com/question/4551913

#learnwithBrainly

8 0

3 years ago

20 POINTS!!!!

Y_Kistochka [10]

A. neutrons

Isotopes contain equal numbers of protons but different numbers of neutrons in their nuclei.

8 0

3 years ago

A food web is a diagram that shows how different food chains connect. true or false

Lorico [155]

Answer:

true

Explanation:

5 0

3 years ago

You want to determine the protein content in milk with the Kjeldahl method. You take 100 g whole milk and use 100 mL of 0.5 M hy

stepladder [879]

Answer:

3.38%

Explanation:

Given that;

the mass of the whole milk sample = 100 g

volume of HCl = 100 mL = 0.1 L

molarity of HCl = 0.5 M

volume of NaOH = 34.50 mL = 0.0345 L

molarity of NaOH = 0.3512 M

Since we knew the molarity and volume of both HCl and NaOH; we can calculate their corresponding number of moles present.

So, number of moles of HCl = molarity of HCl × volume of HCl

number of moles of HCl = 0.5 M × 0.100 mL

= 0.05 mole

number of moles of NaOH = Molarity of NaOH × Volume of NaOH

number of moles of NaOH = 0.3512 M × 0.0345 L

= 0.012 mole

From the question, we can deduce that the number of HCl that is consumed by NH₃ is equal to the number of moles of HCl that is consumed by NaOH.

SO, number of moles of HCl consumed by NH₃ = Total moles of HCl - moles of HCl consumed by NaOH

= 0.05 mole - 0.012 mole

= 0.038 mole

However, to determine the mole of NH₃ present , we have:

number of moles of NH₃ present = number of moles of HCl consumed by NH₃ = 0.038

∴ the mass of Nitrogen with the molecular weight (14.0 g/mol) = 0.038 moles × 14.0 g/mol

= 0.530 g

Now, the percentage of Nitrogen can be calculated as;

$percentage of nitrogen =\frac{mass of nitrogen}{mass of the whole milk sample} *100$

$percentage of nitrogen =\frac{0.530g}{100g} *100$

$percentage of nitrogen =0.530%$ %

the percentage of protein in the sample = CP × %age of N

where CP is given as 6.38

∴ the percentage of protein in the sample = 6.38 × 0.530%

the percentage of protein in the sample = 3.3814%

the percentage of protein in the sample = 3.38%

6 0

3 years ago

The valency of calcium is2 ? what does it mean

nalin [4]

Answer:

hope you like it

Explanation:

because ouytermost shell contains two electrons

calcium is in group 2 so its valency is two valency is the number of outer shelll electrons it needs to have an stable outer shell . it needs 2 more .

5 0

3 years ago