someone tell me how to balance the equation by hit and trial method...​

Answer:

A) CnH2n+2

Explanation:

Answer:

Mendeleev left spaces in his periodic table because he predicted there were elements that weren't discovered yet that would fit in these spaces.

Explanation:

Answer:

He left gaps in his periodic table to place elements not known at the time.

Answer:

Final pressure is 0.956 atm

Explanation:

Based on Boyle's law, "The volume of an ideal gas is inversely proportional to the pressure when temperature is constant". The equation is:

P₁V₁ = P₂V₂

Where 1 represents initial state and 2 final state of the gas.

If a gas has 239L and 2.00 atm as initial state. If the final volume is 500L:

239Lₓ2.00atm =  P₂500L

239Lₓ2.00atm / 500L =  P₂

0.956atm =  P₂

Answer:

D

Explanation:

The proberties of the substances that are produced are different from the properties of the original substances.

Answer:

Resources and power

Discoveries of silver, lead, zinc, and gypsum have been successfully developed, but the country's dependence on imports for its energy requirements is high. In the early 1980s offshore natural gas wells began production in the Celtic Sea south of County Cork.

Explanation:

The primary natural resources of the Republic of Ireland include natural gas, petroleum, peat, copper, lead, dolomite, barite, limestone, gypsum, silver and zinc. Key industries based on these and other natural resources include fishing, mining, and various forms of agriculture and fish farming.

Explanation:

I believe it is number four

Answer:

Magnesium Bromide

Explanation:

MgBr₂

Answer:

0.082g

Explanation:

The following data were obtained from the question:

Heat (Q) = 0.092J

Change in temperature (ΔT) = 0.267°C

Specific heat capacity (C) of water = 4.184J/g°C

Mass (M) =..?

Thus, the mass of present can be obtained as follow:

Q = MCΔT

0.092 = M x 4.184 x 0.267

Divide both side by 4.184 x 0.267

M = 0.092 / (4.184 x 0.267)

M = 0.082g

Therefore, mass of water was present is 0.082.

Answer:

P-waves compression waves while S-waves are shear waves.

Explanation:

P- waves has the ability to travels through solid, liquid and gaseous medium while S-waves travels through only solid medium and restricted by liquid and gaseous medium. P-waves is a type of seismic wave that will reach first to the recording station as compared to S-waves because P-waves moves faster that S-waves that moves slower so that's why P-waves reach first on the recording station that is located 500 miles away.

Answer:

Option A. 2, 3, 2

Explanation:

We'll begin by balancing the equation. This can be achieved by doing the following:

Fe + Cl2 —> FeCl3

There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cl2 and 2 in front of FeCl3 as shown below:

Fe + 3Cl2 —> 2FeCl3

There are 2 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Fe as shown below:

2Fe + 3Cl2 —> 2FeCl3

Now the equation is balanced.

The coefficients are : 2, 3, 2

Answer:

11.2 moles of KNO3 will be required to prepare 8.0 L of 1.40 M KNO3

Explanation:

To answer this question, we need an understanding of the units of the term called molarity.

1.40M KNO3 means that there are 1.4 moles per dm^3 or per liter of the solution.

Now, since there are 1.4 moles in 1 liter

x moles will be present in 8.0 liters

Thus, mathematically;

x * 1 = 8 * 1.4

x = 11.2 moles

Answer:

Light is made up of wavelengths of light, and each wavelength is a particular colour. The colour we see is a result of which wavelengths are reflected back to our eyes. The visible spectrum showing the wavelengths of each of the component colours. The spectrum ranges from dark red at 700 nm to violet at 400 nm.The 'colour' of an object is the wavelengths of light that it reflects. This is determined by the arrangement of electrons in the atoms of that substance that will absorb and re-emit photons of particular energies according to complicated quantum laws.The reason that different waves of light appear to be different colors of light is because the color of a light wave depends on its wavelength. For example, the wavelength of blue light is about 450 nanometers, while the wavelength of red light is about 700 nanometers.

Explanation:

Answer:

An acid is simply a molecule or a chemical which gives hydrogen ions while mixed or reacted with water

Answer:

Water transports important nutrients throughout the plant.

Explanation:

Much like blood in an animal, water is necessary for a plants survival, as it transports important nutrients from the soil all through the plant's stems and leaves.

Answer:

get a little more than that is a great deal for the company and inventor of a company how can we get u a great job with their best friend in a few months but il will send you i will be the only person I know of fishes and the best I have to ask me to make it to my own home wifi and I am grade up to the same thing and the same way of the American people I have a lot to make a simple one person

Answer:

The Ka is 6.183 * 10^-10

Explanation:

The first thing to do here is to write the dissolution equation of carbonic acid in water.

H2CO3 + H20 ———> H30+ + HCO3-

After writing this, the next thing is to write the expression for Ka

Mathematically that would be ;

Ka = [H30+][HCO3-]/[H2CO3]

Next thing is to set up an ICE table

ICE table stands for initial, change and equilibrium.

For clarity sake, please check attachment for the ICE table for this chemical reaction

Mathematically by definition;

pH = -log [H3O+]

From the question, we were made to know that the pH is 5.19

Hence;

5.19 = -log [H3O+]

-5.19 = log [H30+]

[H3O+] = 10^-(5.19)

[H3O+] = 6.46 * 10^-6 M

So how does this relate to the ICE table?

From the ICE table, we can see that the equilibrium concentration of the hydroxonium ion equals x.

This means that the equilibrium concentration of the hydroxonium ion [H3O+] , demoted as x = 6.46 * 10^-6 M

Now according to the Ka equation;

Kindly recall that;

Ka = [H30+][HCO3-]/[H2CO3]

Now, using their equilibrium concentrations;

Ka = (x)(x)/(0.0675-x)

Ka= x^2/(0.0675-x)

Kindly substitute 6.46 * 10^-6 for x

Ka = (6.46 * 10^-6)^2/(0.0675-(6.46 * 10^-6)

Ka = 6.183 * 10^-10

Answer:

The answer is actually 6.18x10^-10

Explanation:

Fill in th box 6.18 and -10

Answer:

nice question dont know the answer tho

Answer:

NUCLEAR ENERGY -----> MECHANICAL ENERGY -------> THERMAL ENERGY --------> ELECTRICAL ENERGY

Explanation:

In nuclear reactor, various energy transformations occur in order to generate electricity. Nuclear reactor converts the energy released from nuclear fission and the heat generated is removed from the reactor by a cooling system where steam is generated. The steam then drives a turbine which powers a generator to produce electricity.

A nuclear reactor is hence an equipment where nuclear chain reactions occur and control can be obtained. The nuclear reactor uses mostly uranium-235 and Plutonium-239. When these radioactive substances absorbs neutrons, they undergo nuclear fission causing the nucleus to split into two or more smaller compounds with  the release of kinetic energy a form of mechanical energy, gamma radiations and others.The kinetic energy is then harnessed in the equipment as heat (thermal energy) which is received by a cooling system and steam is generated. The steam can then power the generator from which electricity is obtained (electrical energy).

So therefore, in a nuclear reactor, the nuclear energy is transformed to mechanical energy and then thermal energy which powers the generation of the electrical energy.

Answer:

nuclear energy Right arrow. mechanical energy Right arrow. thermal energy Right arrow. electrical energy or (A)

Explanation:

Answer:

i think its metal pipes

Explanation:

sorry if im wrong

the answer is limestone because it is the weakest

Answer:

284.395332

Explanation:

1 mole= 36.46094

so multiply 36.46094 times 7.8

and you get 284.395332

hope that helped ! Please mark brainliest I only need one more.

Answer:

They happen because each element reacting is trying to attain stability

Explanation:

E.g Mg +Cl>MgCl2

Answer:

The process of making S'more by adding chocolate bar, gram-crackers, and marshmallows in layers is not a chemical reaction

Explanation:

In a chemical reaction, the substances involved in the reaction are known as the reactants and the substances produced have different physical and chemical properties than those of the reactants and they are known as the products.

The bonds that hold the atoms of the reactants are broken down and rearranged, creating entirely new substances as products. Therefore, energy must be added and/or evolved in any chemical reaction and all reactant atoms should be involved in the reaction.

The change in energy can be sensed as heat change such as increase or decrease in the temperature of the products

Since S'more does not involve any of the above changes that occur in a chemical reaction when the chocolate bar, gram-crackers, and marshmallows are put together, it is not a chemical change or a chemical reaction.

1.2 moles of hydrogen

please see the attached picture

hope it helps

Good luck on your assignment

The net charge of the ion that consists of 7 protons, 9 neutrons, and 10 electrons will be -3.

HOW TO CALCULATE NET CHARGE:

net charge = no. of protons - no. of electrons

net charge: 7 - 10

net charge = -3

Learn more: https://brainly.com/question/21430387?referrer=searchResults

Answer: Example: The water in a species envirmoent suddenly becomes more acid therefore, the species adapts it's body to become more resistent and tolerate to chemicals.

This might also give it an adavantage to the species who have not yet adapted to the change

Explanation: There are three type of adaptions. 1) Structural 2) Behavioral 3) Physiological

Answer:

K: +1

Br: +7

O: -2

Explanation:

O is always -2

K is in group one, so that is its charge

-8+1 is -7, so we flip the sign and that becomes Br

The reason why we flip it is to get a net balance of 0