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Answer:

2 electrons

8 electrons

8 electrons

1 electron (just count in the rings for these ones)

19 protons (it says "P=19" in the middle. The P stands for Protons)

K (it's from Latin medieval Latin "kalium")

39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)

Explanation:

The concentration of H2SO4 is  0.176 M. The number of moles of H2SO4 is 0.0165 moles.

The equation of the reaction is;

2KOH(aq) + H2SO4(aq) ------> K2SO4(aq) + H2O(l)

The number of moles of KOH = 1.85 g/56 g/mol = 0.033 moles

concentration = number of moles /volume

volume = 200 cm3 or 0.2 L

concentration of KOH = 0.033 moles/0.2 L = 0.165 M

From the titration formula;

CAVA/CBVB =na/nb

CA = concentration of acid

VA = volume of acid

CB = concentration of base

VB = volume of base

na = number of moles of acid

nb = number of moles of base

Making CA the subject of formula;

CA = CBVBna/VAnb

CA = ?

CB = 0.165 M

VA =  9.35 cm3

VB = 20.0 cm3

na = 1

nb =2

CA = CBVBna/VAnb

CA = 0.165 M ×  20.0 cm3  × 1/9.35 cm3 × 2

CA = 0.176 M

The concentration of sulphuric acid is 0.176 M

From the reaction equation;

2 moles of KOH reacts with 1 mole of H2SO4

0.033 moles of KOH reacts with 0.033 moles ×  1 mole/2 moles

= 0.0165 moles of H2SO4

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Answer:

J

Explanation:

Because the vapor can be turned back to water and the vapor is still considered water.

Answer:

molecular compound

Explanation:

it has two or more nonmetal elements and are covalently bonded

There are 2.72 kilograms of nitrogen present in a 3.50 L sample of N₂O.

To find the mass of nitrogen in N₂O, we must calculate the number of moles of N₂O.  

[tex] n_{N_{2}O} = \frac{m_{N_{2}O}}{M{N_{2}O}} [/tex]  (1)

Where:

[tex] m_{N_{2}O}[/tex]: is the mass of N₂O

[tex]M_{N_{2}O}[/tex]: is the molar mass of N₂O = 44.013 g/mol

The mass of N₂O can be founded from the density:

[tex] d = \frac{m}{V} [/tex] (2)

Where:

d: is the density of N₂O = 1.22 g/mL

V: is the volume = 3.50 L = 3500 mL

Then, the mass of N₂O is (eq 2):

[tex] m = d*V = 1.22 g/mL*3500 mL = 4270 g [/tex]

Now, the number of moles of N₂O is (eq 1):

[tex] n_{N_{2}O} = \frac{4270 g}{44.013 g/mol} = 97.02 \:moles [/tex]

Knowing that in 1 mol of N₂O we have 2 moles of N, the number of moles of nitrogen is:

[tex] n_{N} = \frac{2\: moles \: N}{1 \:mol \: N_{2}O}*n_{N_{2}O} = \frac{2\: moles \: N}{1 \:mol \: N_{2}O}*97.02 \:moles \:N_{2}O = 194.04 \: moles [/tex]

Finally, with the number of moles of N we can find its mass:

[tex] m = n_{N}*M_{N} = 194.04 \:moles*14.007 g/mol = 2717.9 g = 2.72 kg [/tex]

Therefore, there are 2.72 kilograms of nitrogen.  

Find more about the number of moles here:

https://brainly.com/question/10165629?referrer=searchResults  

I hope it helps you!

Answer:

It's false. We can not alter the formula of the substance involved in a chemical reaction.

There are 300 light particles in an airtight container. The adjustment that would increase the speed of the particle is keeping the pressure constant and increasing the temperature. Option B is correct.

The speed of a particle is the distance traveled by one molecule of a substance. Particles travel as a result of the kinetic energy they possess.

The kinetic energy attributed to each particle rises as the temperature rises.

As a result, in 300 light particles, the particles will travel more quickly when the temperature is increased while the pressure of the particle remains constant.

Therefore, we can conclude that the adjustment that would increase the speed of the particles is keeping the pressure constant and increasing the temperature.

Learn more about particles here:

https://brainly.com/question/2288334?referrer=searchResults

"An unbalanced force will move the box down"

I could be wrong but I tried

And it's ok if you don't give brainliest to me

But I hope this helped:)

Have a wonderful day!

Answer:

I think it's number one option

v=5.0×10^12Hz

[tex]\\ \sf\longmapsto E=hv[/tex]

[tex]\\ \sf\longmapsto E=6.626\times 10^{-34}Js\times 5\times 10^12s^{-1}[/tex]

[tex]\\ \sf\longmapsto E=33.13\times 10^{-22}J[/tex]

Answer:

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Answer:

A. Sugar and water

Explanation:

Because water can dissolve sugar

Answer:

The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized.

Explanation:

Hope it helps!

Answer:

An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Explanation:

I hope you have a nice day and please mark me(:

Answer: Elements are simply what you see on the periodic table. E.g. carbon, oxygen, hydrogen etc. Isotopes are elements with different masses. ... So isotopes have the same amount of protons but with different amounts of neutrons.

Explanation: plz mark brainliest!

Answer:

Ionic compounds conduct electricity when molten or in aqueous solution, because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.

Explanation:

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Answer:

nCl= 0,062x3/2=0,093(mol)

Explanation:

Explanation:

3 moles of O2 will be produced from 2moles of NaCLO3.

hope this helps you.

Answer:

D. Grass Health

Explanation:

Explanation:

Answer:

nucleosynthesis

Explanation:

The correct answer is nucleosynthesis.

After the hydrogen in the star's core is exhausted, the star can fuse helium to form progressively heavier elements, carbon and oxygen, and so on, until iron and nickel are formed. Up to this point, the fusion process releases energy. The formation of elements heavier than iron and nickel requires an input of energy.

In a supernova explosion, neutron capture reactions take place (this is not fusion), leading to the formation of heavy elements. This is the reason why it is said that most of the stuff that we see around us comes from stars and supernovae (the heavy elements part).

Learn more about nucleosynthesis here https://brainly.com/question/20767918

#SPJ2

Answer:

Answer:

0.4699

Explanation:

The penalty for not voting in New South Wales is a $55 fine. You must respond within 28 days of the issue date of the notice. You will have four options: If you voted, you can provide details of where and when using our non-voter self-service portal.

Answer:

A a chemical change

Explanation:

because a chemical change is when you mix tow substance together and they creat a new substance

Answer:

The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. When a liquid becomes a solid, freezing or solidification has occurred.  The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.

Explanation: