7 An atom that has 13 protons and 15 neutrons is an isotope of the element(1) nickel (3) aluminum
(2) silicon (4) phosphorus

Answers

Answer 1

Answer: an atoms identity is always defined by the number of protons and it is seen in the periodic table so if an atom has 13 protons it will be aluminum

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The temperature of a sample of water changes from 10°C to 20°C when the water absorbs 100 calories of heat. What is the mass of the sample?
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a student used 10 mL water instead of 30 mL for extraction of salt from mixture. How may this change the percentage of NaCl extracted?

Answers

It will be extracted only 1/3 of NaCl less in 10 mL of water than in 30 mL of water.

If it is known that solubility of NaCl is 360 g/L, let's find out how many NaCl is in 30 mL of water:

360 g : 1 L = x g : 30 mL

Since 1 L = 1,000 mL, then:
360 g : 1,000 mL = x g : 30 mL

Now, crossing the products:
x · 1,000 mL = 360 g · 30 mL
x · 1,000 mL = 10,800 g mL
x = 10,800 g ÷ 1,000
x = 10.8 g

So, from 30 mL mixture, 10.8 g of NaCl could be extracted.

Let's calculate the same for 10 mL water instead of 30 mL.

360 g : 1 L = x g : 10 mL

Since 1 L = 1,000 mL, then:
360 g : 1,000 mL = x g : 10 mL

Now, crossing the products:
x · 1,000 mL = 360 g · 10 mL
x · 1,000 mL = 3,600 g mL
x = 3,600 g ÷ 1,000
x = 3.6 g

So, from 10 mL mixture, 3.6 g of NaCl could be extracted.

Now, let's compare:
If from 30 mL mixture, 10.8 g of NaCl could be extracted and from 10 mL mixture, 3.6 g of NaCl could be extracted, the ratio is:
3.6/10.8 = 1/3

Therefore, it will be extracted only 1/3 of NaCl less in 10 mL of water than in 30 mL of water.

A sample contains 6.25 percent parent isotope and 93.75 percent daughter isotopes. If the half-life of the parent isotope is 58 years, how old is the sample?

Answers

The parent isotope percent will change from 100% to 50% to 25% to 12.5% and to 6.25%. So the sample go through four times of half-life. So the sample is 58*4=232 years old.

Answer is: the sample is 232 years old.

Take 100 atoms:

After first half-life: 50% · 100 ÷ 100% = 50.

After second half-life: 0.5 · 50 = 25.

After third half-life: 0.5 · 25 = 12.5.

After fourth half-life: 0.5 · 12.5 = 6.25.

6.25 ÷ 100 · 100% = 6.25%.

4 half-lives will it take before only about 6.25% of the original sample remains.

t = 4 · 58 y.

t = 232 y.

Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?higher temperature / more kinetic energy / more space between particles / higher volume
higher temperature / less kinetic energy / less space between particles/ higher volume
higher temperature / more kinetic energy / less space between particles / lower volume
higher temperature / less kinetic energy / more space between particles / lower volume

Answers

Answer: higher temperature / more kinetic energy / more space between particles / higher volume.

Explanation:

1) One postulate of the kinetic theory is that the average kinetic energy of gas particles is proportional to the absolute temperature of the gas.

That means that the higher temperature, the higher the kinetic energy of the molecules, which is the start of the sequence of the relationship between temperature and volume.

2) Since average kinetic energy is proportional to the square of the speed, KE = [1/2] mass × (speed)², it follows that at higher the kinetic energy the faster the molecules will move.

3) By moving faster, the particles will collide more frequently so they will move away from each other, occupying more space.

4) More space between the molecules, is more volume.

So, the sequence is complete: higher temperature → higher kinetic energy (higher speed) → more space → more volume.

The answer is: higher temperature/ more kinetic energy/ more space between particles/ higher volume

GUYS HELP ME PLEASE. MY TEACHER IS GONNA KILL ME IF I DONT SOLVE THIS RIGHT. Write the election configuration (H, Al, S,CI, Ni)

Answers

Explanation:

1s 2s 2p

1s 2s 2p1s2 2s1

1s 2s 2p1s2 2s1 2 1 1

1s 2s 2p1s2 2s1 2 1 11s2 2s2

Please help me, please

Answers

Answer:

A. Metal

Explanation:

Hope this helps! :)

If this wasn't what you were looking for please don't hesitate to comment again! Have a nice day/night! :)

Answer:

Metal

Explanation:

they deleted my answer so I am putting it back sorry

Reacts with air..physical or chemical property ;)

Answers

Reacting with air is a chemical property because here two substances are reacting and changing their atoms and appearance, which can not be unchanged.

What are chemical properties?

Chemical properties are those property properties of a substance that does not depend on the quantity of that substance.

For example, a magnet with a small amount of magnet has the same magnetic property and a large amount of magnet has the same magnetic property. The magnetic property of the magnet does not change with the amount of substance.

Air contains many gases, and substances when exposed to air, react with it and change their appearance and chemical appearance, this is a chemical change.

Thus, because two substances are here reacting and changing their atoms and appearance, which cannot be unmodified, reacting with air is a chemical attribute.

To learn more about chemical properties, refer to the below link:

brainly.com/question/24167500

#SPJ2

It is a chemical process - an oxidation.

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