HI! I REALLY NEED HELP, THANK YOU!!

Answer:

2

H

2

+

O

2

=

2

H

2

O

Explanation:

From the original equation, you first need to write each component separately.

H

2

+

O

2

=

H

2

O

Left side: H = 2 ; O = 2 (number based on the subscript)

Right side: H = 2 ; O = 1 (number based on the subscripts; no subscript means that the element is just 1)

Notice that the number of H is already balance but the number of O is not. In order to balance the O, you need to multiply the element by 2, but you CANNOT do this by simply changing the subscript.

Hence,

H

2

+

O

2

=

2

H

2

O

Left side: H = 2 ; O = 2

Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2

Now, notice that the number of O is now balance (both are 2) but the number of H is not (since

H

2

O

is a substance and not an element, you need to multiply everything by 2). So, what to do?

You also multiply the left side H by 2. Hence,

2

H

2

+

O

2

=

2

H

2

O

Left side: H = 2 x 2 = 4 ; O = 2

Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2

The equation is now balanced.

Answer:

C

I am pretty sure that is the answer

The mass of the given cube of 173.7g and the volume of the box is 9 cm³.Then the density is 19.3 g/cm³. Therefore, the element with this density is gold. Option D is correct.

Density of a substance is the ratio of mass to its volume. Thus it tells about how much denser the substance is in the given volume. This physical quantity is dependant on mass, volume temperature and pressure.

The element have their own density corresponding to the mass and volume used. The dimensions of the given box is 3, 3 and 1. Thus volume is the product of this length, breadth and height.

Volume = 3 ×3 × 1

             = 9 cm³.

Mass of the box is given 173.7 grams. Now, the density of the element is calculated as follows:

Density = 173.3 /  9 cm³

             = 19.3 g/cm³.

From the table, it is clear that the this density corresponds to the element gold. Therefore, option D is correct.

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Answer:

[tex]1 \: ml = \frac{1}{1000} l \\ 7.65 \times {10}^{5} \: ml = \frac{7.65 \times {10}^{5} }{1000} \\ = 765 \: l[/tex]

Answer:

In chemical bonds

Explanation:

A P E X

The energy in biomass is used to make electricity. The energy stored in

biomass in the form of chemical bonds.

Biomass was organic, which means it must be made up of material derived from living beings like plants as well as animals.

What is chemical bonds?

A chemical bond can be known as a long-term interaction involving atoms, ions, as well as molecules which allows chemical compounds to occur.

Biomass is made up of chemical energy that has been stored from the sun. Process called photosynthesis by which plants make biomass. Biomass can also be produced by burning for heat or processed into renewable liquid as well as gaseous fuels using a variety of techniques.

Therefore, the correct answer will be  option A.

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Answer:

An increase in temperature typically increases the rate of reaction because an increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

Explanation:

Can you please give this answer a brainliest answer please

Answer:

All standard reduction potentials are measured against that of the reduction of hydrogen ions to H2 gas.

Explanation:

The standard hydrogen electrode (SHE) serves as a sort of reference electrode. All standard electrode potentials of chemical systems are measured against the standard hydrogen electrode whose electrode potential has been arbitrarily set at 0.00 V.

The reduction potential of any other system is measured against the standard hydrogen electrode by connecting that half cell to the standard hydrogen electrode and observing the reading of the voltmeter. The standard hydrogen electrode consists of hydrogen ions of unit activity, hydrogen gas at 1 atm and the system is maintained at a temperature of 298 K.

Standard reduction potentials are measured against that of the reduction of hydrogen ions to [tex]H_2[/tex] gas because hydrogen is chosen as a standard reference and has electrode potential zero.

It is impossible to measure absolute electrode potential for an electrode without forming cell . Therefore it is assumed that standard electrode potential for hydrogen is zero

The standard reduction potential of a cell is determined by subtracting the standard reduction for the reaction at the anode from the standard reduction potential for the reaction at the cathode.

                        [tex]E_c_e_l_l[/tex]°[tex]= E_c_a_t_h_o_d_e[/tex]°[tex]- E_a_n_o_d_e[/tex]°

The species liking to get reduced is defined in term of standard reduction potential.

The species whose standard reduction potential is to be calculated is placed at cathode and at anode hydrogen electrode is used.

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Answer: 1.09 Liers

Explanation:

I did the problem and got it correct.

Answer:

A. 1.09

Explanation:

I did the Chemistry Exam

Answer:

0.02 m

Explanation:

∆U = q + w

w = ∆U - q = (1380 - 2040) J = -660 J

w = -p∆V = -pA∆h

∆h = -w/(pA)

p = 1 bar × (100000 Pa/1 bar) = 100000 Pa

∆h = -(-660 J)/(100000 Pa×0.33 m²) = 0.02 m

A gas is contained in a horizontal cylinder with a moveable piston of cross-sectional area 0.33\text{ m}^20.33 m 2. The distance through which the piston moves is 0.02 m.

Among other related systems, pistons are found in reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders, and pneumatic cylinders. It is the moving part that is enclosed in a cylinder and sealed off from the gas by piston rings.

The piston, which is a part of combustion engines, transforms the energy released during combustion into a mechanical action and sends it, via the piston pin and connecting rod, to the crankshaft as a torsional force. The piston in the cylinder goes up and down when the engine is running.

The equation given by

∆ U = q + w

w = ∆ U - q

= ( 1380 - 2040 )

J = -660 J

w = -p∆V

= -pA∆h

∆h = -w / (pA)

p = 1 bar × ( 100000 Pa / 1 bar )

= 100000 Pa

∆h = - ( -660 J) / ( 100000 Pa × 0.33 m² )

= 0.02 m

Thus, The distance through which the piston moves is 0.02 m.

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Answer:

The breaking of chemical bonds never releases energy to the external environment. Energy is only released when chemical bonds are formed. In general, a chemical reaction involves two steps: 1) the original chemical bonds between the atoms are broken, and 2) new bonds are formed. These two steps are sometimes lumped into one event for simplicity, but they are really two separate events. For instance, when you burn methane (natural gas) in your stove, the methane is reacting with oxygen to form carbon dioxide and water. Chemists often write this as:

CH4 + 2 O2 → CO2 + 2 H2O + energy

Explanation:

here is the answer

Answer:

14.53

Explanation:

V1= 218ML

V2= ?

P2= 15P1

USING BOYLE'S LAW

P1V1= P2V2

V2= P1V1/P2

V2 = P1(218ML)/15P1 = 14.53ML

Answer:  5 plates

Explanation:

Because you have 5 sandwiches total

5 plates are the theoretical yield. Hence, option C is correct.

The theoretical yield is the maximum possible mass of a product that can be made in a chemical reaction.

The actual yield is the result obtained from the experiment while the theoretical yield is the result obtained from our calculations.

The actual yield of a chemical reaction rarely equals the theoretical yield because some of the amounts are lost during the process.

5 plates are the theoretical yield.

Hence, option C is correct.

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Answer:   A process of cooking food in a pot made from unglazed and natural clay. coddling: Heating food in water kept just below the boiling point.

Explanation:

Answer:

4 mol FeCl3

Explanation:

[tex]6molCl_{2} *\frac{2mol FeCl_3}{3molCl_2}[/tex] = 4 mol FeCl3

Use the train-track method shown up above. We are simply setting up molar ratios derived from balanced equation to solve this.

Answer:

Explanation:

Answer:

The correct answer is - reduce carbon emission, decrease deforestation snd increase plantation, use renewable energy.

Explanation:

Global warming is the process that is caused by human activities to increase the temperature of the earth. It increases the heat of the climate of the earth that leads to a negative impact on the environment. Increasing the greenhouse gas emission leads to trapping heat and cause global warming.

The three major solutions are:

1. reduce carbon and greenhouse gases: The main cause of global warming is the emission of greenhouse gases and an increase in carbon in the atmosphere, so reduce these gas emissions by avoiding fossil fuels that release carbon.

2. reduce deforestation and increase the plantation: trees take carbon dioxide from the environment, So prevent them from cutting and planting new trees will help reducing carbon from the environment.

3. Using renewable energy will help them to not depend on fossil fuels or water waste that will help in reducing global warming.

Answer:

x = 2, [tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\[/tex]

Explanation:

This question is related to balancing chemical equations.

[tex]CH_{4} + xO_{2} = CO_{2} + 2H_{2}O\\[/tex]

- There must be the same amount of carbons (C), hydrogens (H), and oxygens (O) on each side of the equals sign.

- There is already 1 carbon and 4 hydrogens on each side of the equals sign. The big number in front of the chemical compound multiplies into the individual elements and can be multiplied by the subscripts to get the total number of each element.

- On the right side of the equation, there are 4 oxygens (O), and on the left side, there are 2. In order for there to be 4 oxygens (O) on the left side, there must be a 2 in front of [tex]O_{2}[/tex].

Therefore, x = 2.

[tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\[/tex]

Answer:

The estimated atomic of silicon is 28.082 a.m.u.

Explanation:

The estimated atomic mass of silicon ([tex]M_{Si, est}[/tex]), in a.m.u., is equal to the weighted average of atomic masses of silicon available in nature and in terms of their abundances:

[tex]M_{Si, est} = r_{1}\cdot M_{Si-28} + r_{2} \cdot M_{Si-29} + r_{3}\cdot M_{Si-30}[/tex] (1)

Where:

[tex]r_{1}[/tex], [tex]r_{2}[/tex], [tex]r_{3}[/tex] - Relative abundance of each isotope, no unit.

[tex]M_{Si-28}[/tex], [tex]M_{Si-29}[/tex], [tex]M_{Si-30}[/tex] - Atomic mass of each isotope, in a.m.u.

If we know that [tex]M_{Si-28} = 27.976\,a.m.u.[/tex], [tex]M_{Si-29} = 28.976\,a.m.u.[/tex], [tex]M_{Si-30} = 29.974\,a.m.u.[/tex], [tex]r_{1} = \frac{92.22}{100}[/tex], [tex]r_{2} = \frac{4.68}{100}[/tex] and [tex]r_{3} = \frac{3.09}{100}[/tex], then the estimated atomic mass of silicon is:

[tex]M_{Si, est} = r_{1}\cdot M_{Si-28} + r_{2} \cdot M_{Si-29} + r_{3}\cdot M_{Si-30}[/tex]

[tex]M_{Si,est} = \left(\frac{92.22}{100} \right)\cdot (27.976\,a.m.u.) + \left(\frac{4.68}{100} \right)\cdot (28.976\,a.m.u.) + \left(\frac{3.09}{100} \right)\cdot (29.974\,a.m.u.)[/tex]

[tex]M_{Si, est} = 28.082\,a.m.u.[/tex]

The estimated atomic of silicon is 28.082 a.m.u.

Answer:

false

Explanation:

Answer:

false

Explanation:

lava is on the earth

Answer:

Paleoclimatology

Step by Step explanation:

is the study of climate records from hundreds to millions of years ago. Information for paleoclimate studies come from natural records rather than instruments: these indirect records of climatic conditions are called proxy records. Coring a tree to gain access to tree ring data.

Answer:

Some acid rain occurs naturally, but sulfur dioxide and nitrogen oxide emissions from smokestacks combine with rain to make sulfuric and nitric acid in amounts that harm.

Explanation:

Answer:

diffusion: the movement of molecules in a solution from an area of

higher concentration to an area of lower concentration

Diffusion is the movement of particles from where there are more to where there are less. This movement occurs until particles are evenly spread out. While diffusion can be seen in all states of matter, it is most common in liquids and gases.

Explanation:

                 Two advantage of Tourist Industry:

Tourism is one of the largest and fastest growing industry in terms of generating more revenues, providing Large number of employment opportunities and only one major ways to development the nation within short spam of time. There are so many facts that, tourism helps making the country renowned all over the world and is called only one weapon to make country strong as from all the aspects.

Although, as we all know that, there are several facts and data's which shows that tourism is only one largest industry throughout world that generated huge amounts of Money than others. So what are the advantages of tourism? Which can be pointed out as following :-

1. Tourism helps to generate more revenues in the country.

2. The tourism can change the nation within a short time period.

3. Tourism helps to provide more numerous kinds of human resources in the nation.

4. Tourism is only one way to develop and to make renowned in the world

Answer:

NaOH+ N2O3---> NaNO2 + H2O

Answer:

C

Explanation:

I think it is a ever lasting process of pain and happiness cause the ones that are closest to you can make it hurt most but they can also make your day So probably

Answer:

Chemistry

Explanation:

Chemistry is considered the central science.

Chemistry is sometimes called "the central science" because it's so important to other fields of science, like biology, geology, astronomy, physics, medicine, engineering, materials science, and many other areas of study.

All the branches of science possess their own level of importance, However, physics deals with the fundamental workings of material reality which are central to all other branches of science.

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Answer:

5 Different Types of Corrosion Prevention Methods

Barrier Coatings. One of the easiest and cheapest ways to prevent corrosion is to use barrier coatings like paint, plastic, or powder. ...

Hot-Dip Galvanization. ...

Alloyed Steel (Stainless) ...

Cathodic Protection. ...

EonCoat.

Answer:

C) A constant that states how many atoms/molecules are in one mole of anything

Explanation:

Avogadro's number like the name suggests is a constant that states how many atoms/molecules are in one mole of anything.

Answer:

7178.22 mL

Explanation:

Applying,

PV = P'V'................. Equation 1

Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.

make V' the subject of the equation

V' = PV/P'.............. Equation 2

From the question,

Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa

Substitute these values into equation 2

V' = (2250×290)/90.9

V' = 7178.22 mL

Answer:

sana nakatulong po sainyo