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4 years ago

When you are balancing chemical reactions ('equations'), what must you never touch?

Chemistry

2 answers:

timofeeve [1]4 years ago

8 0

You should never touch the subscripts, as that will change the composition. Hope I helped!

frozen [14]4 years ago

6 0

<u>Answer:</u>

The correct answer option is: the number in subscript.

<u>Explanation:</u>

When you are balancing any chemical equation, you must never touch or change the number in subscript of the molecule of a chemical or compound.

The number in subscript of any molecule or compound shows the ratio of atoms that makes up that certain molecule or compound.

You can only change or alter the number written left to the molecule of compound to balance the equation.

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What is a substance which allows the red blood cells to carry oxygen and iron.

bogdanovich [222]

The answer is hemoglobin. The substance which allows the red blood cells to carry oxygen and iron is called hemoglobin. It is a protein containing iron. Its main function is to carry oxygen to all the parts of the body.

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3 years ago

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How many iron atoms are reactants in this equation? 4Fe+ 302

storchak [24]

Answer:

4 atoms of oxygen.

Explanation:

The given equation is :

$4Fe+3O_2\rightarrow 2Fe_2O_3$

Here Fe and O₂ are reactants and Fe₂O₃ is a product. It is a balanced chemical reaction in which the number of atoms on LHS are equal to number of atoms on RHS.

4 atoms of iron react with 3 atoms of oxygen to form iron oxide. Hence, there are 4 atoms of reactants in this equation.

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3 years ago

One of the emission lines that provides the green color in fireworks, which com s from barium salts, has a wavelength of 505nm.

PSYCHO15rus [73]

Explanation:

(a)

The relation between frequency and wavelength is shown below as:

$c=frequency\times Wavelength
$

c is the speed of light having value $3\times 10^8\ m/s$

Given, Wavelength = 505 nm

Also, 1 m = $10^{-9}$ nm

So,

Wavelength = $505\times 10^{-9}$ m

Thus, Frequency is:

$Frequency=\frac{c}{Wavelength}$

$Frequency=\frac{3\times 10^8}{505\times 10^{-9}}\ Hz$

$Frequency=5.94\times 10^{14}\ Hz$

(b)

Also, $E=\frac {h\times c}{\lambda}$

Where,

h is Plank's constant having value $6.626\times 10^{-34}\ Js$

c is the speed of light having value $3\times 10^8\ m/s$

So,

$E=\frac{6.626\times 10^{-34}\times 3\times 10^8}{505\times 10^{-9}}\ J$

$E=\frac{10^{-26}\times \:19.878}{10^{-9}\times \:505}\ J$

$E=3.94\times 10^{-19}\ J$

(c)

Electromagnetic spectrum is range of the frequencies and their respective wavelengths of the various type of the electromagnetic radiation.

In order of the increasing frequency and the photon energy and the decreasing wavelength the spectrum are:

Red , Orange, Yellow, Green, Blue, Indigo, Violet

Increasing wavelength is the opposite trend. Thus, The longest visible wavelength is red and the shortest is violet.

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3 years ago

A good definition of snow and how snow is important to the water cycle.

IRISSAK [1]

Snow is the result of moisture and low temperatures colliding; when they collide, they become tiny ice crystals. When ice crystals stick to one another, they become snowflakes. Snow is important to the water cycle because when they precipitate to the earth, they start to melt on surfaces warmer than themselves. The melted result becomes water, and when the water either seeps into the ground or flows into a source of water nearby, the water cycle's process repeats all over again.

I hope you like this answer, please Brainliest me, and have a great day! :D

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4 years ago