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2 years ago

SOMEBODY PLEASE HELPP I HAVE LIKE 10 TEST THAT I HAVE TO TAKE AND I WAS OUT SICK THOSE DAYS

1 answer:

4 0

Answer: the 1st one is B, 2 is A, 3 is A, 4 is a or D for this one, 5 is c, 6 is b, 7 is b, 8 is d, 9 is a, 10 is b those are my best guess and if that did work I'm sorry I didn't help you and take care also have a great day.

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PLZ HELP ME

mariarad [96]

The balanced reaction is 3 Ca ( s ) + N 2 ( g ) → Ca 3 N 2 ( s ).

<u>Explanation</u>:

A chemical equation is said to be balanced when the total number of atoms present on the reactants side is equal to the total number of atoms present on the product side.

The unbalanced chemical equation is as follows,

Ca ( s ) + N 2 ( g ) → Ca 3 N 2 ( s )

To balance this equation, you need to look at how many atoms of each element are present on each side of the chemical equation.

Calcium has 1 atom on the reactant and 3 on the products side. To balance the reaction we need to multiply the calcium atom by 3 on the reactants side.

3 Ca ( s ) + N 2 ( g ) → Ca 3 N 2 ( s )

Now Nitrogen has a coefficient of 2 on both sides of the reaction. Hence the balanced chemical equation will thus be

3 Ca ( s ) + N 2 ( g ) → Ca 3 N 2 ( s )

3 0

2 years ago

Problem Page Question It takes to break a carbon-carbon single bond. Calculate the maximum wavelength of light for which a carbo

Marizza181 [45]

This is a incomplete question. The complete question is:

It takes 348 kJ/mol to break a carbon-carbon single bond. Calculate the maximum wavelength of light for which a carbon-carbon single bond could be broken by absorbing a single photon. Round your answer to correct number of significant digits

Answer: 344 nm

Explanation:

$E=\frac{Nhc}{\lambda}$

E= energy = 348kJ= 348000 J (1kJ=1000J)

N = avogadro's number = $6.023\times 10^{23}$

h = Planck's constant = $6.626\times 10^{-34}Js
$

c = speed of light = $3\times 10^8ms^{-1}$

$348000=\frac{6.023\times 10^{23}\times 6.626\times 10^{-34}\times 3\times 10^8}{\lambda}$

$\lambda=\frac{6.023\times 10^{23}\times 6.626\times 10^{-34}\times 3\times 10^8}{348000}$

$\lambda=3.44\times 10^{-7}m=344nm$ $1nm=10^{-9}m$

Thus the maximum wavelength of light for which a carbon-carbon single bond could be broken by absorbing a single photon is 344 nm

5 0

2 years ago

Why was plastic first invented? How is plastic bad for the environment?

olya-2409 [2.1K]

Answer: The first plastic based on a synthetic polymer was invented in 1907. Plastic sticks around in the environment for ages, threatening wildlife and spreading toxins.

8 0

2 years ago

Read 2 more answers

9. In a period, do the number of shielding electrons change? Why do you think

Setler79 [48]

Answer:

The nuclear charge increases, but the number of inner shielding electrons stays the same.

Explanation:

Their shielding does not change, so the effective nuclear charge — the charge felt by a valence electron — increases.

The valence electrons are pulled closer to the nucleus, decreasing the atomic radius.

For example, consider the elements of Period 3.

$\begin{array}{ccccc}& & \textbf{Number of} & \textbf{Inner} & \textbf{Valence}\\\textbf{At. No.} & \textbf{Symbol} & \textbf{Protons} & \textbf{Electrons} & \textbf{Electrons}\\11& \text{Na} & 11 & 10 & 1\\12& \text{Mg} &12 & 10 & 2\\13& \text{Al} & 13 & 10 & 3 \\14& \text{Si} & 14 & 10 & 4 \\15& \text{P} & 15 & 10 & 5\\16& \text{S} & 16 & 10 & 6\\17& \text{Cl} & 17 & 10 & 7\\18& \text{Ar} & 18 & 10 & 8 \\\end{array}$

The number of protons increases as you go from one element to the next, but the number of inner electrons is constant.

3 0

3 years ago

I´LL GIVE BRAINLIEST ORDER THE FOLLOWING LIQUIDS FROM MOST DENSE TO LEAST DENSE: WATER, PANCAKE SYRUP, COOKING OIL, MILK, DISH S

NeX [460]

Answer:

sope syrup cooking oil milk water

Explansation:

5 0

3 years ago