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frez [133]
3 years ago
11

An atom of iron has the atomic number 26 and a mass number of 56. how many protons plus neutrons are in the nucleus?

Chemistry
2 answers:
mojhsa [17]3 years ago
4 0
<span>iron has 26 protons and 30 neutrons are in the nucleus</span>
sergeinik [125]3 years ago
3 0
Hello there,

The answer will be 56 because 30 plus 26 equals 56.

Hope I helped :)
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guajiro [1.7K]
Hiii,so the problem is ‍♀️
5 0
2 years ago
a student poured water in to a paper cup and let it freeze,when she came to take it out she saw the side pushed out
Zina [86]

Great Question!

Everything around us is made up of matter. (Matter is just a fancy word for stuff.) If you cut matter up as small as you possibly can - much smaller than you can see with your eyes, or even a microscope - then you get what scientists like to call atoms. There's lots of different kinds of atoms, like oxygen, nitrogen, and hydrogen atoms. You may have learned about some of these in school. When you put several atoms together, they "bond" (or stick) together and you get what's called molecules.

A water molecule is what you get when you put together two hydrogen atoms and one oxygen atom. The shape of the water molecule has the oxygen atom in the middle and the two hydrogen atoms stuck to it on the sides, and it sort of makes a triangle. It looks a little bit like this, where the O is the Oxygen atom, the H's are the Hydrogen atoms, and the lines are the bonds between them:

O

/ \

H H

Other molecules (for example, different types of chemicals) have different shapes.

When a liquid (like water) is frozen, all of the molecules start sticking to each other and holding on very tightly. Because different types of molecules have different shapes, they hold on to each other in different places. Most of the time, when they start holding on to each other, they get closer together. When the molecules get closer together, they take up less space, so the frozen solid ends up being smaller than the unfrozen liquid.

Water, however, is a bit weird. When the water molecules start holding on to each other really tightly, they make a pattern that actually takes up /more/ space than they did when they weren't stuck together. (This pattern is what you see if you look at ice crystals.) So, when water freezes, the molecules take up more space, and the ice ends up being even /bigger/ than the water was.

If you were to put that water in a closed container in the freezer, then it would still get bigger. What happens to the container depends on what sort of a container it is. For example, if the container were made of thin plastic, it would probably stretch a bit as the water freezes. But if you were to put it in a very full, tightly sealed glass container, then the frozen water would be pushing so hard that the glass might break. This is why if you put a glass bottle of juice in the freezer, you're supposed to take the lid off until it's frozen all the way.

3 0
3 years ago
The sum of pH and pOH for any aqueous solution equals .
Vsevolod [243]

Answer:

pH is calculated by taking negative logarithm of hydrogen ion concentration. Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7. Thus the sum of pH and pOH is 14

Explanation:

6 0
3 years ago
A buffer can be prepared by mixing two solutions. Determine if each of the following mixtures will result in a buffer solution o
GenaCL600 [577]

Answer:

The answers are in the explanation

Explanation:

A buffer is the mixture of a weak acid with its conjugate base or vice versa. Thus:

<em>1)</em> Mixing 100.0 mL of 0.1 M HF with 100.0 mL of 0.05 M mol KF. <em>Will </em>result in a buffer because HF is a weak acid and KF is its conjugate base.

<em>2)</em> Mixing 100.0 mL of 0.1 M NH₃ with 100.0 mL of 0.1 M NH₄Br. <em>Will not </em>result in a buffer because NH₃ is a strong base.

<em>3) </em>Mixing 100.0 mL of 0.1 M HCN with 100.0 mL of 0.05 M KOH. <em>Will </em>result in a buffer because HCN is a weak acid and its reaction with KOH will produce CN⁻ that is its conjugate base.

<em>4)</em> Mixing 100.0 mL of 0.1 M HCl with 100.0 mL of 0.1 M KCl <em>Will not </em>result in a buffer because HCl is a strong acid.

<em>5)</em> Mixing 100.0 mL of 0.1 M HCN with 100.0 mL of 0.1 M KOH <em>Will not </em>result in a buffer because each HCN will react with KOH producing CN⁻, that means that you will have just CN⁻ (Conjugate base) without HCN (Weak acid).

I hope it helps!

6 0
3 years ago
What masses of iron(iii) oxide and aluminum must be used to produce 15.0 g iron? what is the maximum mass of aluminum oxide that
defon
1) Chemical reaction:

Fe2O3 + 2Al ---> Al2O3 + 2Fe

2) molar ratios

1 mol Fe2O3 : 2Al : 1 mol Al2O3 : 2 mol Fe

3) Convert 15.0 g of iron into moles

atomic mass Fe = 55.8 g/mol

moles = mass in grams / atomic mass = 15.0 g / 55.8 g/mol = 0.269 mol

4) Use proportions to determine the moles of Fe2O3, Al, and Al2O3

a) 1mol Fe2O3 / 2 mol Fe = x / 0.269 mol Fe

x =

=> x = 0.269 mol Fe * 1 mol Fe2O3 / 2 mol Fe = 0.134 mol Fe2O3

b) 2 mol Al / 2 mol Fe = x / 0.269 mol Fe

=> x = 0.269 mol Al

c) 2 mol Fe / 1 mol Al2O3 = 0.269 mol Fe / x

=> x = 0.269 mol Fe * 1 mol Al2O3 / 2 mol Fe

x = 0.134 mol Al2O3

5) Convert moles to grams

a) Fe2O3

molar mass Fe2O3 = 2* 55.8 g/mol + 3*16g/mol = 159.6 g/mol

mass = molar mass * number of moles

mass = 159.6 g/mol * 0.134 mol = 21.4 g

b) Al

atomic mass = 27.0 g/mol

mass = number of moles * atomic mass = 0.269 mol * 27.0 g/mol = 7.26 g

c) Al2O3

molar mass = 2 * 27.0 g/mol + 3*16.0 g/mol = 102.0g/mol

mass Al2O3 = numer of moles * molar mass = 0.134 mol * 102.0 g/mol = 13.7 g

Answers:

21.4 g Fe2O3

7.26 g Al

13.7 g Al2O3
6 0
3 years ago
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