What chemistry law is the reason we balance chemical reaction equations?

Answer:

gravity equation.

Explanation:

use this gravity equation

F= G(m1*m2/d²)

Answer:

B.fin position

C.colour of stripes

The amount of energy required to eat 5.25 g of Titanium from 85.5 celsius to 132.5 celsius is 129 joules.

Absorbed or released amount of heat will be calculated by using the below formula as:

Q = mcΔT, where

m = mass of titanium = 5.25g

c = specific heat of titanium = 0.523 J/gram degree celsius

ΔT = change in temperature = 132.5 - 85.5 = 47 degree celsius

On putting these values on the above equation we get,

Q = (5.25)(0.523)(47) = 129 joules

Hence required heat is 129 joules.

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the amount of energy absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure, is formed.

According to Avogadro's law 1 mole of any gas occupies 22.4 L (dm3) at room temperature and pressure.

So the amount of energy absorbed:

(kJ)E=131∗240/22.4

=1403.6(kJ)

1403.6 kJ is absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure is formed.

Answer:

Molarity=number of moles÷volume(L)

Answer:

a. C (s)+ 02(g)---->C02(g)

b. CO2(g) +C(s)--->2CO(g)

Explanation:

This reaction is the method of purification of some precious metals such a iron(Fe) in it's ore. a.The carbon(coke) is oxidized to carbon (IV) oxide

b. the carbon dioxide gas is reduced with the same carbon to produce carbon(II) oxide.

Answer:

I'm not sure

Explanation:

I'm just not sure

Answer:

25.7 g

Explanation:

I don't know what to put here hahaha, I hope my answer helps you ^^

The number of moles of silver oxide (I) needed to produce 4 moles of silver is 2 moles

From the question, we are to determine the number of moles of silver oxide (I) needed to produce 4 moles of silver

First, we will write the balaced chemical equation for the decomposition of silver oxide (I)

2Ag₂O(s) → 4Ag(s) + O₂(g)

This means, 2 moles of silver oxide (I) [Ag₂O] decomposes to give 4 moles of silver and 1 mole of oxygen gas.

From the balanced chemical equation, it is easy to deduce the number of moles of silver oxide (I) that would give 4 moles of silver.

Hence, the number of moles of silver oxide (I) needed to produce 4 moles of silver is 2 moles

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Answer:

1.5 mol/L

Explanation:

molarity = moles/litres

NaOH = 23 + 16 + 1 = 40 g/mol

[tex] ? \: mol \: naoh \: = 30 \: g \: naoh \: \times \\ \\ \frac{1 \: mol \: naoh}{40 \: g \: naoh} = 0.75 \: mol \: naoh[/tex]

molarity = 0.75 mol NaOH ÷ 0.5 L = 1.5 mol/L NaOH

Answer:

Almost all the galaxies were at the time moving away from us . All the elements that we see around us . Cosmic microwave background radiation . The formation of galaxies and the large scale structure of the cosmos .

Explanation:

Answer:

Physical :)

Explanation:

Skin works as a shield to the outside elements and does a good job of keeping the bad stuff out. :)

Have an amazing day!!

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In the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.

However, paired electrons simply means are 2 electrons occupying the same orbital in an atom or molecule of a substance

On the other end, unpaired electron is a single electron that occupies an orbital of an atom.

An atom is the smallest part of an element which can take part in a chemical reaction.

Some atoms of elements are:

In conclusion, in the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.

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Answer: 6, 1

Explanation:

1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.

The mass of rock salt required to lower the temperature of ice by 19 °C is determined using the Blagden's Law given below:

where;

The van't hoff factor for NaCl, i = 2

Kf for water/ice = 1.86 °C kg/mol

molalityof NaCl = (mass/molar massl) / kg of ice

The mass of NaCl is derived as follows:

molar mass of NaCl = 58.5

mass of ice = 3.78 kg

Let molality of NaCl = X

ΔT = 19 °C

Inputting the values above in the equation of Blagden law:

19 = 2 x 1.86 °C kg/mol x X

X = 5.11 mol/kg

Then, the mass of NaCl will be;

mass of NaCl = 5.11 × 3.78 × 58.5

mass of NaCl = 1129.9 g

Therefore, 1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.

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[tex]\sf\huge\underline\purple{Ozone\: Gas:-}[/tex]

[tex]\rightarrow[/tex]Ozone is an allotropic molecular form of oxygen containing three atoms of oxygen (O3). Ozone O3 is generated through the passage of oxygen O2 through a high voltage potential resulting in the attachment and formation of a third oxygen atom.

[tex]\rightarrow[/tex]The molecular formula for ozone (O3) was established by Soret (1863) by taking the ratio of the change in volumes when O3/O2 mixtures were either heated or exposed to turpentine and cinnamon oil.

[tex]\rightarrow[/tex]Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen (NOX ) and Volatile Organic Compounds (VOC), which are also known as Hydrocarbons. This reaction can occur both near the ground and high in the atmosphere.

__________________________________

Hope it helps you:)

[tex]w = \text{Number of mols} \times \text{Molar mass}=4.8 \times 58.5=280.8~ g[/tex]

We know,

Molar Mass of Sodium= 23 and,

Molar Mass of Chlorine= 35.45

[tex] \therefore \text{Molar Mass of Sodium chloride= 58.44 }\text{g/mol}[/tex]

So, The Molar Mass in Grams=

[tex]58.44 \frac{\text{g}}{ \cancel\text {mol}} \times 4.80 \: \cancel\text{mol} \\ \\ \text{Mass of NaCl }= 280.51\: \text {gram}[/tex]

Answer:

B.

Explanation:

Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction owing to te fact that energy is a reactant in the equation.

An endothermic reaction is one in  wioch energy is supplied to the system in order to enable the breakdown of bonds. Hence, the reaction vessel feels cool as energy is withdrawn from the surroundings.

The reaction;  Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction since energy is a reactant in the equation.

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Answer: Vanadium

Explanation:

The moles of substances required to make scrambled eggs is given in the cooking recipe for scrambled eggs.

A mole of. a substance is the amount of that substance which contains the avogadro number (6.02 × 10^23) of particles in it.

A mole of a substance is usually given as a standard unit measurement of that substance.

The mass of 1 mole of is known as the molar mass if that substance.

From the recipe for preparing scramble eggs given, the moles of substances required are as follows:

Therefore, the moles of substances required to make scrambled eggs is given in the cooking recipe for scrambled eggs.

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Answer:

i think 50C

Explanation:

It only makes since cause if its 4.43 and u want the volume to be 3.13 it has to me 50C

Use Charles law

[tex]\\ \rm\rightarrowtail V_1T_2=V_2T_1[/tex]

[tex]\\ \rm\rightarrowtail 4.43T_2=(70)(3.13)[/tex]

[tex]\\ \rm\rightarrowtail 4.43T_2=219.1[/tex]

[tex]\\ \rm\rightarrowtail T_2=49.4°C[/tex]

Answer:

a. Urmila always goes to the temple, doesn't she?

b. Was the baby playing with the doll?

c. When will Peter start a business?

d. They have not finished the work yet.

e. She told me that her brother knows me.

f. Sita was married by Ram.

Explanation:

A. In grammar, a question tag is a very short clause at the end of a statement which changes the statement into a question. For example, in 'She said half price, didn't she?' , the words 'didn't she' are a question tag.

B. Interrogative questions/sentences often have to get a yes/no answer.

C. The "next year" will be the answer to that question. U need to ask when.

D. The have not done the work yet, therefore the answer would change from "not finish" to "have not finished"

E. Indirect speech is speech which tells you what someone said. It's like the game "telephone" indirect speech is what you tell someone else, what another person said, or what someone else tells you what another person said.

F. Passive voice means that a subject is a recipient of a verb's action.

For a volume of 27,000 L to a pressure of 0.82 atm at 25 °C, the amount of N2 is required  is mathematically given as

n=1.1*10^{-3}mole

Generally, the equation for the ideal gas  is mathematically given as

PV=nRT

Therefore

[tex]n=\frac{PV}{RT}\\\\n=\frac{0.980*2700}{0.0821*298}[/tex]

n=1.1*10^{-3}mole

In conclusion, the amount of N2 is required is

n=1.1*10^{-3}mole

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Answer:

E. 16.6 mol HCl

Explanation:

The equation for the reaction is;

Zn + 2 HCl --> ZnCl2 + H2

From the reaction 2 moles of HCl produces 1 mole of ZnCl2

Therefore; 8.3 moles of ZnCl2 will be produced by;

 = 8.3 moles ×2

 = 16.6 Moles of HCl

 Therefore;  E.  16.6 mol HCl

Explanation:

distance = speed x time

distance = 10 x 2

distance = 20miles

hope that helps :)

If a cross country runner travels at a speed of 10 mph and he runs for 2 hours, 20miles he will have run at the end of the 2 hours.

Distance is a description of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can be used to describe a length in physics or to an estimate based on other factors in common usage.

The phrase is widely used metaphorically to refer to a measurement of the degree of distinction between two similar items since spatial intelligence is a rich source of implicatures in human understanding.

distance = speed x time

distance = 10 x 2

distance = 20miles

Therefore,  20miles is the distance.

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trimethyl nonane

Explanation:

Answer:

its axis

Explanation:

the earth rotates on its axis 24 hrs a day in relation to the sun.

Answer:

exert no attractive forces on each other, or on the walls of the container

Explanation: