Need help solving this want to know either A or B

Answer:

.455 M

Explanation:

Ba (OH)^2   has mole weight of (from periodic table) = 171.341 gm/mole

49.2 gm  / 171.341  gm/mole = .287 mole

.287 M / .62984 L  = .455 M

Answer:

True

Explanation:

I assume this is refering to gases such as O2, H2, I2, F2, ect. And possibly the nobel gases which are completly insoluable. As gases they should be given the state (g).

Elemental gases are relatively insoluble in water and should be given the state (g). The given statement is true.

An example of  elemental gas is Helium (He).

Helium belongs to the class of noble gases,  these elements are defined by their low reactivity, also as gases, they do not have color or odor. Helium is part of this group that contains other 5 elements because Helium characteristics are similar to other noble gases, indeed this is the first noble gas in the periodic table. Additionally, helium is an abundant element found in all the universe especially in stars. Helium gas is used to fill balloons.

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Answer:

2.21 grams

Explanation:

The first thing you need to do is find the chemical formula for sodium chloride which is NaCl (Molar mass: 58.44 g/mol).

The next the thing to do is to convert the mL to L by dividing by 1000 which will give us 0.158 L.

Now we look at the molarity formula M = n/L, plug in the molarity for M and the liters for L. 0.239 M (mol/L) = n/0.158 L.

Solve for n to get the number of moles of NaCl in the solution. You should get 0.037762 moles.

Then we have to multiply this by the molar mass of NaCl, (0.037762 mol)*(58.44 g/mol).

Moles cancel and when we round to sig figs we are left with 2.21 grams.

Hope this helps.

Answer:

the answer is H3O+.......

Answer:

H₂O

Explanation:

A Brønsted-Lowry base accepts protons. As seen in the equation, H₂O gains a proton to become H₃O⁺. It has gained one proton- a hydrogen atom.

C₂H₃O₂⁻ is a conjugate base.

H₃O⁺ is a conjugate acid.

HC₂H₃O₂ is an acid [or a Brønsted-Lowry acid].

this is how you find it:

23-11=12

the 12 is the amount of neutrons

Answer:

C

Explanation:

Because D ask "They have a negative charge" yes and no, but neutrons do, Why? Well because  the neutron has a negative charge both in its inner core and its outer edge, with a positive charge sandwiched in between to make the particle electrically neutral. Whilst B is wrong because like protons and electrons they were both measured and observed differently, just as the neutron. So that makes C the only correct answer.

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The term pH has to do with the hydrogen ion concentration of a solution.

The term pH has to do with the hydrogen ion concentration of a solution. Let us now proceed the pH of the solutions;

a) pH of HCl = -log(0.25) = 0.62

b) pH of H2SO4 = -log(0.15) = 0.82

c)  We have to set up an ICE table here;

              C6H5COOH + H2O ⇄ C6H5COO- + H^+

I            0.15                                  0                      0

C          -x                                       +x                     +x

E         0.15 -x                                  x                      x

Ka = [C6H5COO-] [ H^+]/[C6H5COOH]

6.4 x 10^-5 = x^2/0.15 - x  

6.4 x 10^-5(0.15 - x) = x^2

9.6 * 10^-6 - 6.4 x 10^-5x = x^2

x^2 + 6.4 x 10^-5x - 9.6 * 10^-6 = 0

x=0.003 M

Hence;

[C6H5COO-] = [ H^+] = x = 0.003 M

pH = - log[0.003 M] = 2.5

d) [OH-] [H^+] = 1.0 x 10-14 mol2 dm-6

[H^+] = 1.0 x 10-14 mol2 dm-6/ 0.10 mol dm-3

[H^+] = 1 * 10^-13 M

pH= - log[1 * 10^-13 M] = 13

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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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Answer:

that the oxygen atom is not equal on both sides

Explanation:

Thus the reaction is not balanced.

0.634 mol of NaOH can 200 mL of this buffer neutralize before the pH rises by 0.50.

A buffer is a solution that can resist pH change upon the addition of an acidic or basic components.

Solution:

A buffer consists of 0.11 M HA and 0.11 M NaA.

Ka =[tex]4.82 X 10^-^5[/tex]

pKa = -log ([tex]4.82 X 10^-^5[/tex])

pKa = 11.83

Using Henderson equation to calculate pH of the buffer solution.

pH =PKa -log [tex]\frac{Conjugate \;base}{Acid}[/tex]

pH = 11.83 - [tex]\frac{0.11 M}{0.11 M}[/tex]

pH = 10.83

pOH = 14 - 10.83

pOH = 3.17

Calculating the moles of NaOH added by the addition of 200 mL

Molarity = [tex]\frac{Moles \;of \;NaOH}{0.2 L}[/tex]

3.17 X 0.2 = Moles of NaOH

Moles of NaOH = 0.634 mol

Hence, 0.634 mol of NaOH can 200 mL of this buffer neutralize.

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Answer:

wilt

Explanation:

Without sunlight, photosynthesis cannot occur, and photosynthesis makes chlorophyll, the plant's food. Therefore, a plant without sunlight will "starve," and begin wilting.

Answer:

it will true

Explanation:

The partial atmospheric pressure (atm) of hydrogen in the mixture is 0.59 atm.

Partial pressure of particular gas will be calculated as:

p = nP, where

Moles will be calculated as:

Moles of Hydrogen gas = 2.02g / 2.014g/mol = 1 mole

Moles of Chlorine gas = 35.90g / 70.9g/mol = 0.5 mole

Mole fraction of hydrogen = 1 / (1+0.5) = 0.6

Partial pressure of hydrogen = (0.6)(748) = 448.8 mmHg = 0.59 atm

Hence, required partial atmospheric pressure of hydrogen is 0.59 atm.

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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.

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:

sour ??

Explanation:

Answer:In 1752

Explanation:Benjamin franklin in 1752 to prove that lightning was electrical,he flew a kite during a thundorstorm.He tied a metal key onto the string and as he suspected it would ,electrically from the storms  clouds flowed down the string ,which was wet and he received an electrical shock.

Electricity was discovered and understood by many scientists. Benjamin Franklin is given the credit for discovering electricity. In the year 1752, Benjamin Franklin conducted an experiment using a kite and key on a rainy day.

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:

Abiotic

Explanation:

Its because it includes water, sunlight, tempature and soil

A chemical equation is an equation showing the formation of new products from reactants.

A chemical reaction is a reaction which involves changes in the composition and chemical properties of substances resulting in the formation of new substances.

A chemical reaction is usually represented by chemical equations.

A balanced chemical equation is one in which the atoms of elements are equal on both sides of the equation.

A net ionic equation shows only the ions that form products.

Therefore, a chemical equation is an equation showing the formation of new products from reactants.

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Answer:

Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. This model of an atom was developed by Ernest Rutherford, a New Zealand native working at the University of Manchester in England in the early 1900s

Explanation:

yan na ang exact

Rutherford's atomic model is the model which described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.

Answer:

Snake

Frog

Grasshopper

Monkey

Mushroom

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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Answer:

.006L or 6 mL

Explanation:

There is no diagram attached but there are some ways by which you can find it too easily by yourself

Usually energy diagram uses ∆H .

So

So observe∆H whether it. is decreasing or increasing ,

Answer:

That there appears to be many stars in the sky

Explanation: hope this helps! <33333

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].

Answer: below

Explanation:

Glass can be heated up and turn into a liquid, its a hard procces, due to the extreme heat, machines are used today.

Answer:

answer

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Explanation:

Because glass is hard, it must be a supercooled liquid. Glass, however, is actually neither a liquid—supercooled or otherwise—nor a solid. It is an amorphous solid—a state somewhere between those two states of matter

Answer:

(a)Cu2S(s) + O2(g) --> 2Cu(s) + SO2(g)

(b) single displacement reaction