What is pH defined as?

Answer:

B. Ernest Rutherford's gold foil experiment

Explanation:

That experiment showed a space with the tiny dense spot, referred to as the nucleus. The experiment involved shooting alpha particles (helium nuclei) at a very thin sheet of gold and then observing.

Answer:

D all

Explanation:

because law of conservation of mass describes A, B and C statement

Answer:

Weather maps im sorry im not sure but i think its the answer

Answer:

yes

Explanation:

sedimentary rocks are mad from erosion and weathering!

weathering erosion and deposition occur to form every sedimentary rock that exist on Earth weathering is the creation of sediment through its supposed to wind or water tearing off pieces or do I survive a logical activity such as tree roots and animal hooves breaking at rock erosion is the transportation of the sediments from origin to deposition through wind water or glacial ice deposition is the process of the sediments being dropped off by their mode of movement or erosion method by glacial ice when are water.

Answer:

The sun is lighting up different amounts of the moon.

Explanation:

Enthalpy change is the heat that evolved or got absorbed in a reaction mixture. The enthalpy change for the reaction is -137 kJ.

Hess's law states that the enthalpy for the whole reaction will be equal to the summation of all changes that are independent of the steps of the reaction.

First, arrange all the reactions and balance them, first the data of equation 1 is rearranged:

NO₂ must be on the reactant side and must be multiplied by 3/2 so that 3 moles of NO are balanced.

3 NO₂ (g) → 3 NO (g) + 3/2 O₂ (g),    ΔH = + 174 kJ

Now, for equation 2: the moles of HNO₃ required is 2 so the whole equation will be divided by 2 as,

N₂ (g) + 5/2 O₂ (g) + H₂O (l) → 2HNO₃ (aq),      Δ H = -128 kJ

Now, for equation 3: N₂ and O₂ should be eliminated and reversed as,

2NO (g) → N₂(g) + O₂(g)    ΔH = -183 kJ

Now, to determine the enthalpy the rearranged equation 1, 2, and 3 are added to get the final equation:

3NO₂ (g) + H₂O (l) → 2HNO₃ (aq) + NO (g)

Δ H = 174 - 128 - 183

= -137 kJ

Therefore, -137 kJ is the enthalpy change.

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Answer:

It is an amorphous solid and hence also called pseudo solid. So it flows very slowly over thousands of years. It is not visible to the n*ked eye.

Answer:

See below

Explanation:

PV = n RT        R = .082057  L - Atm / (K-Mole)

.97 V = .118 (.082057)(305)    

    V = 3.04 liters

Will not change for argon.....will be the same for all ideal gases

Answer:

A stir bar consists of a magnetic bar used to agitate a liquid mixture or solution

Explanation:

Answer:

182.532 [gr.].

Explanation:

1) equation of this reaction is:

2Cu+O₂⇒2CuO;

2) according to the equation made up above, ν(CuO)=ν(Cu); it means ν(Cu)=2.87 (mol.), then

3) m(Cu)=ν(Cu)*M(Cu);

m(Cu)=2.87*63.6=182.532 [gr].

A. The mass of NaCl needed to react with F₂ at 280 K and 1.50 atm is 115.83 g

B. The mass of NaCl needed to react with F₂ at STP is 78.39 g

We'll begin by calculating the number of mole of F₂ by using the ideal gas equation as follow:

n = PV / RT

n = (1.5 × 15) / (0.082 × 280)

n = 0.98 mole

Next, we shall determine the number of mole NaCl that reacts. This is given below

F₂ + 2NaCl → Cl₂ + 2NaF

From the balanced equation above,

1 mole of F₂ reacted with 2 moles of NaCl.

Therefore,

0.98 mole of F₂ will react with = 0.98 × 2 = 1.96 moles of NaCl

Finally, we shall determine mass of NaCl as follow

Mass = mole × molar mass

Mass of NaCl = 1.98 × 58.5

Mass of NaCl = 115.83 g

At standard temperature and pressure (STP),

22.4 L = 1 mole of F₂

Therefore,

15 L = 15 / 22.4

15 L = 0.67 mole of F₂

Next, we shall determine the number of mole NaCl that reacts. This is given below

F₂ + 2NaCl → Cl₂ + 2NaF

From the balanced equation above,

1 mole of F₂ reacted with 2 moles of NaCl.

Therefore,

0.67 mole of F₂ will react with = 0.67 × 2 = 1.34 moles of NaCl

Finally, we shall determine mass of NaCl as follow

Mass = mole × molar mass

Mass of NaCl = 1.34 × 58.5

Mass of NaCl = 78.39 g

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[OH⁻] = 0.158 x 10 ⁻⁷ M is the concentration of OH- of a solution with an H3O⁺ concentration equal to 6.31  x 10 ⁻⁷ M.

The letters pH stand for the power of the hydrogen ion. The pH of a solution is the negative logarithm of the hydrogen-ion concentration.

pH = - [log H⁺]

[tex]\rm [H^{+}] [OH^{-}] = 1 \times 10^{-14}[/tex]

[tex]\rm[OH^{-}] = \dfrac{1 \times 10^{-14} }{ [H^{+}] }[/tex]

[tex]\rm[OH^{-}] = \dfrac{1 \times 10^{-14} }{ 6.31 \times 10^{-7} }[/tex]

[OH⁻] = 0.158 x 10 ⁻⁷ M

Therefore [OH⁻] = 0.158 x 10 ⁻⁷ M is the concentration of OH- of a solution with an H3O+ concentration equal to 6.31  x 10 ⁻⁷ M.

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Answer:

Running to catch the bus would be it

Explanation:

because you're running for the others you barly move

Answer:

Form  covalent bond

Explanation:

If their electronegativity is same or very close they will likely form covalent bond (where they share electrons)

The new pressure is 75.51 mmHg if a sample of carbon monoxide gas is contained in a 345 mL vessel at a temperature of 25 °C. and a pressure of 985 mmHg and the gas is allowed to expand to a new volume of 4.50 litres at a constant temperature.

The gas laws consist of three primary laws: Charles' Law, Boyle's Law and Avogadro's Law (all of which will later combine into the General Gas Equation and Ideal Gas Law).

The pressure on the gas changes, while the temperature remains constant, and we want to find the new volume. So, we will use Boyle's Law, which states there is an inverse relationship between the pressure on a gas and the volume of the gas. The formula is:

[tex]P_1V_1=P_2V_2[/tex]

[tex]P_1 = 985 mm Hg[/tex]

[tex]V_1 = 345 mL[/tex] =

[tex]P_2 = ?[/tex]

[tex]V_2 = 4.50 liters[/tex]

The pressure of the gas is originally 985 mm Hg and the volume is 345 mL.

We are solving for the new volume, so we must isolate the variable V₂.

Now putting all the values in the equation:

[tex]P_1V_1=P_2V_2[/tex]

[tex]985 X 0.345 L=P_2 X 4.50[/tex]

[tex]P_2[/tex] = 75.51 mmHg

Hence, the new pressure is  75.51 mmHg.

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[tex]thanks \: for \: points[/tex]

brainliestmark me as

Answer:

the most useful hydrocarbon is fuel.

Explanation:

some examples like: natural gases,coal,diesel fuel, kerosene etc.

The most useful hydrocarbon is fuel like gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane.

The term hydrocarbon is defined as the compound which is made up of hydrogen and carbon. They are useful as energy sources. Hydrocarbons are examples of group 14 hydrides.

There are four types of hydrocarbon that are alkanes, alkenes, alkynes and aromatic hydrocarbons.

Among the most widely used hydrocarbon fuels include gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane. Plastics and synthetic fabrics like polyester are made using hydrocarbons as well.

Thus, The most useful hydrocarbon is fuel like gasoline, natural gas, fuel oil, diesel, jet fuel, coal, kerosene, and propane.

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The change in enthalpy associated with the change in the water’s temperature is 1254 J.

The amount of heat required to increase the temperature of one gram of a substance by one Celsius degree is known as specific heat.

Enthalpy change will be calculated as:

ΔH = -cmΔT, where

m = mass of water = 50g

c = specific heat of water = 4.18J/g°C

ΔT = change in temperature = 28 - 22 = 6 °C

On putting values in the above equation, we get

ΔH = -(4.18)(50)(6) = -1254 J

Hence change in enthalpy of the reaction is -1254 J.

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Answer:

sour ??

Explanation:

Answer:

The position of the moon during its orbit around Earth.

Explanation:

Answer:

Atomic weight of Hydrogen is 1. There are 2 Hydrogen atoms in water molecule. So it is 2. Oxygen atomic weight is 16.0 and adding 2 and 16, we will get 18.18 is the equivalent weight of water.

Explanation:

Hope this helps

Answer:

1. 36.5g                 2. 103.3g

3. 140g                   4. 151g

5. 159g

Explanation:

1. HCl

atomic mass of H= 1g

atomic mass of Cl = 35.5g

solution:

       HCl

     = 1+ 35.5

      = 36.5g

2. ZnF2

atomic mass of Zn = 65.3g

atomic mass of F = 19g

solution:

                ZnF2

               = 65.3 + 2(19)

                =65.3 + 38

                = 103.3 g

3. K2CO3

 atomic mass of K= 40g

atomic mass of C = 12g

atomic mass of O = 16g

Solution:

               K2CO3

               = 2(40) + 12 + 3 (16)

                = 80 + 12 + 48

                 = 140g

4. FePO4

  atomic mass of Fe = 56g

  atomic mass of P= 31 g

  atomic mass of O = 16g

solution:

              FePO4

              = 56 + 31 + 4 (16)

              = 56 + 31 + 64

               = 151g

5. Cu2S

atomic mass of  Cu = 63.5g

atomic mass of S = 32 g

solution

       Cu2S

       = 2(63.5 )+ 32

        = 127 + 32

         =159g

Answer:What type of compound is Magnesium bromide?

Magnesium bromide (MgBr2) is a chemical compound of magnesium and bromine that is white and deliquescent. It is often used as a mild sedative and as an anticonvulsant for treatment of nervous disorders. It is water-soluble and somewhat soluble in alcohol.

Explanation:

The required temperature of the sample of gas is 823K.

Ideal gas equation gives idea about the behavior of gas at different condition & represented as:

PV = nRT, where

Moles will be calculated as:
n = W/M, where

Moles of Neon gas = 1g / 20.1g/mol = 0.049 mole

On putting all these values in the above equation, we get

T = (0.657)(5.01) / (0.049)(0.082) = 822.8 = 823 K

Hence required temperature of the sample is 823 K.

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Answer:

try youre best to succsess

Answer:

Anstree species was preserved as a fossil in the Arizona desert. The species is now extinct. its because we preserved it right so that mean even to it fell down its still alive for the simple reason that we dint ruin it

CGA UUC are the strands of mRNA that would be produced from the strand of DNA shown. Therefore, the correct option is option C.

Deoxyribonucleic acid, or DNA, is an organic molecule with a complex molecular structure which is present in all cells, both prokaryotic and eukaryotic, as well as in a variety of viruses. For the transfer of inherited traits, DNA codes genetic information. The discovery significantly improved scientists' knowledge of DNA replication including the genetic regulation of biological processes.

Despite the fact that the molecule DNA was initially identified in 1869, its significance for the transmission of genes was not demonstrated till 1943. James Watson with Francis Crick discovered that the molecular makeup of DNA consists of a double-helix polymers, a spiral made up of two DNA strands twisted around one another, in 1953 with the help of biophysicists Rosa Lind Franklin with Maurice Wilkins. CGA UUC are the strands of mRNA that would be produced from the strand of DNA shown.

Therefore, the correct option is option C.

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Answer:

(when you get a girl)

Pain is a sensory trigger from your brain to represent the fact that something —or someone— could be hurting you. The pain will end once the thing causing it stops, as in a cause-effect scenario.

Mental health though, can be helped by finding happiness in life, like getting off of clash of clans and touching grass.

Plastic wrap is transparent and so nearly all light passes through easily ,

Wax Paper is translucent and so light is blurred or scattered .

Reflection of light occurs when light hits a smooth surface that does not absorb any of the light but instead bounces it back off the surface.

A mirror is flat, smooth, and polished. When light hits a mirror it is not absorbed but is reflected off at a very predictable angle.

The angle that the light hits the mirror is called the angle of incidence.

The angle of light that bounces off the mirror is called the angle of reflection.

The Law of Reflection states that the angle of incidence is equal to the angle of reflection.

Plastic wrap is transparent and so nearly all light passes through easily ,

Wax Paper is translucent and so light is blurred or scattered .

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