Sam records the mass of his evaporating dish as 6. 251 g.


He records the mass of the evaporating dish and the sample of hydrate as 16. 864 g.


After heating the sample in the evaporating dish to constant weight, the mass of them combined is 11. 13 g.


How many moles of water were removed from the sample by the heating process?


Report your answer with three digits after the decimal

Answer:

Solid Osmium transition metal reacts with Oxygen gas to produce solid Osmium tetroxide.

Os(s) + 2O₂(g) -> OsO₄(s)

Explanation:

Osmium tetroxide is another way of writing Osmium (VIII) oxide.

Leaving powdered osmium exposed to air in a room will slowly create osmium tetroxide at room temperature.

Similarly, osmium tetroxide vapor will readily be released from a liquid solution at room temperature.

When it comes to fire suppression systems, there are several types available in the market, each with its own set of features and cost implications. The least expensive fire suppression system is usually a portable fire extinguisher.

Portable fire extinguishers are small and portable, making them an ideal choice for small fires that can be easily contained and extinguished. These fire extinguishers are usually filled with a dry chemical, water, or foam, and can be purchased for a relatively low cost.
However, when it comes to larger fires, such as those in commercial or industrial settings, portable fire extinguishers may not be sufficient. In these cases, a more robust fire suppression system is required. Some of the more expensive fire suppression systems include wet chemical systems, carbon dioxide systems, and clean agent systems. These systems can cost tens of thousands of dollars to install and maintain, making them a significant investment.
Overall, the least expensive fire suppression system is typically a portable fire extinguisher. However, it is important to consider the size and scale of your facility and the potential risks associated with a fire when selecting a fire suppression system. It is always best to consult with a fire safety expert to determine which fire suppression system is best suited for your needs and budget.

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Answer: Radioactive waste

Explanation:

The nuclear fission reaction consists of heavy atomic particles or heavy nucleus, like plutonium and uranium and in radioactive heavy metals. In the fission reaction the nucleus get split into equal masses of particles. This process is associated with release of large amount of energy. The fission of radioactive waste can cause deadly mutations in living beings.      

Answer:

Sodium chloride

Explanation:

Answer:

Explanation:

The smallest atom on the periodic table is helium, He, and has a radius of 31 pm. Yeah, He is even smaller than hydrogen, H, which is 53 pm. Which atom is the largest? That would be cesium, Cs, which comes in with a radius of 343 pm. ^^

Answer:

No one will precipitated because these all are soluble in water

Explanation:

2KNO3 + FeSO4 -----> K2SO4 + Fe(NO3)2

Answer:

D. The end of a slinky is moved vertically up and down to simulate a wave​

Explanation:

Because it is simulation, it should be a model. The other choices are not simulation or model.

I took the test  before. I got all the answer correct and got 100% score.

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The statement that describes how a scientist uses a model is that the end of a slinky is moved vertically up and down to stimulate a wave. So the correct option is D.

A physical, mathematical or conceptual representation of an idea or a system of ideas, events or processes is known as a scientific model.

For the purpose of understanding and identifying the patterns in our world, comparisons are drawn with the scientific models by the scientists based on their own scientific knowledge. These are also used for predictions of the causes of the phenomenon.

The scientific models created by the scientists should be consistent with the observations, inferences and current explanations. But, the goal of the creation of scientific models cannot be to make factual statements about the world.

Therefore the statement that describes how a scientist uses a model is that the end of a slinky is moved vertically up and down to stimulate a wave. The correct option is D.

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Answer:

When ions are made of a single atom, such as Li+1, they are called monatomic ions

Explanation:

Any atom or molecule with a net charge, either positive or negative, is known as an ion. An ion consisting of a single atom is a monoatomic ion; an ion consisting of two or more atoms is referred to as a polyatomic ion.

The kcal required for one year is 730kcal (kilo calories).

A calorie is a unit of energy measurement. Typically, the energy content of meals and beverages is determined in terms of calories. You must consume fewer calories each day than your body uses up in order to lose weight. On the other hand, in order to gain weight, you must eat more calories than you burn.

The daily caloric needs of adult women range from 1,600 to 2,200. Estimates for men range from 2,000 to 3,200 per day. The low end of the range may be ideal for you if you move very little or not at all during the day. If you are very active throughout the day, the high end of the range can better match your needs. The number of calories we require decreases as we age.

The kcal required for one year is:

2000 X 365 days= 730000 calories.

so as 1Kcal= 1000 calories

73000cal= 730Kcal.

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Answer:

Chemical energies

Explanation:

We get chemical energy from foods, which we use to run about, and move and talk (kinetic and sound energy). Chemical energies are stored in fuels which we burn to release thermal energy - this is one way of making electricity, see Electricity for more information.

Answer:

cold front, cold front, warm front, cold front, warm front, also low, low, high, low, high air presure

Explanation:

The product that get deposited at the cathode of the electrolytic cell has been the Bromine .

Electrolysis has been defined as the decomposition of the chemical compound in the presence of  electric current. The product of the chemical reaction has been the deposited on the anode and cathode of the electrolytic cell. The anode inside the cell has been  negative electrode and attracts the positive ions inside the solution. The cathode has been the positive electrode, and attract the negative ions.

The decomposition of calcium bromide results in the formation of calcium and bromine ions .The product deposited at the cathode of the electrolytic cell has been the Bromine .

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Answer:

Agriculture, forestry, and fisheries are examples of cultural ecosystem services

Explanation:

They provide food (fisheries, agriculture) to both humans and other animals, and forestry provides recreation for humans and an ecosystem for animals!

Answer:

a) Balanced  equation:

An  equation is called balanced if there are same number and same type of atom on both sides of the equation.

b)Reason:

2KClO3--------2KCl + 3O2

Consider this equation in the reactants there are 2KClO3  and in the product there are 2KCl+3O2 . So reactants =products which is a case of balanced chemical equation .

Explanation:

Answer:

28g

Explanation:

Given parameters:

Number of moles of hydrogen  = 3moles

Unknown:

Mass of nitrogen used = ?

Solution:

 To solve this problem, let us establish the balanced reaction equation first;

             N₂  + 3H₂ →  2NH₃

From the balanced reaction equation;

                 3 mole of H₂ will combine with 1 mole of N₂

Now,

   Mass of Nitrogen  = number of moles x molar mass

         Molar mass of N₂  = 2(14) = 28g/mol

   Mass of Nitrogen  = 1 mole x 28g/mole  = 28g

Glycolysis, the splitting of glucose into two 3-carbon molecules.

The citric acid or Krebs cycle, which produces CO2, NADH, FADH2, and ATP.

Answer:; 66 g is about 3/2 the value of the molar mass of CO2. It is reasonable that the sample contains 3/2 (1.5) mol.

Explanation:

The only metal with a known primordial crystal structure is polonium. A polonium atom has an atomic radius of 167 pm and a density of 9.32 g/cm3.

A polonium atom's density and atomic weight may be used to determine its atomic radius. Since polonium has an atomic weight of 209 u, it has a molecular weight of 209 g/mol. This is comparable to 6.022 x 1023 atoms/mol using Avogadro's number. In terms of mass per unit volume, polonium has a density of 9.32 g/cm3, or 9.32 x 103 kg/m3. The atoms are organised in a straightforward cubic lattice due to the polonium's fundamental crystal structure. The volume of a cube formula (4/3)r3 = V, where V is the molar volume (atomic weight/density) divided by Avogadro's number, may be used to determine the radius of a polonium atom. An estimate of 167 pm for the radius is obtained by solving for r.

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Answer:

6.273×10²³

Explanation:

hope this is useful friend

Answer:

6.023 × 10²³

Explanation:

Avogadro's number is used for calculating masses and moles and can applied to Stoichiometry. Avogadro's number is useful for atoms and molecules

Answer:

eat well, stay well, and have fun ∛π⇅πΔΔΔ≅≅⇵↑↓∫∫↑

Explanation:

Answer:

Chemical element symbols are one- and two-letter abbreviations for the element names. They are used to make the periodic table and chemical formulas easier to read. You can combine the symbols to make words. Here is a list of English words made from periodic table element symbols. There are thousands of words that can be written using these symbols, so experiment to see if you can write your name or fun messages that show your chemistry savvy.

acetic acid has a boiling point of 118oc. 391 K (118+273 = 391) is the boiling point of acetic acid in k.

Acetic acid, which has the molecular formula  \(CH_{3} COOH\), is also referred to as ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid. As a byproduct of fermentation, acetic acid lends vinegar its distinctive smell. About 4-6% of the acetic acid in vinegar is water. In laboratories, more concentrated concentrations are often used, and glacial acetic acid is pure acetic acid with very little water present.

The 33rd most frequently manufactured chemical in the US is acetic acid. Acetic anhydride, cellulose acetate, vinyl acetate monomer, acetic esters, chloracetic acid, plastics, dyes, pesticides, photographic chemicals, and rubber are all products made with acetic acid. Other industrial applications include the production of organic chemicals, vitamins, antibiotics, hormones, and dietary additives. Acetic acid typically has amounts of 700 to 1,200 milligrams per kilogram (mg/kg) in wines, up to 860 mg/kg in aged cheeses, and 2.8 mg/kg in fresh orange juice when it is present naturally in food.

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Answer: 21.13 L of \(H_2O\) will be produced from the reaction of 24.65 L of oxygen

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number \(6.023\times 10^{23}\) of particles.

\(2C_2H_6(g)+7O_2(g)\rightarrow 4CO_2(g)+6H_2O(g)\)  

According to stoichiometry :

7 moles of \(O_2\) give = 6 moles of \(H_2O\) vapour  

\(7\times 22.4L=156.8L\)  of \(O_2\) produce = \(6\times 22.4L=134.4L\) of \(H_2O\) vapour  

Thus 24.65 L of \(O_2\) produce = \(\frac{134.4}{156.8}\times 24.65=21.13\) L of \(H_2O\) vapour  

21.13 L of \(H_2O\) will be produced from the reaction of 24.65 L of oxygen

Answer:

21.13

Explanation:

Answer:

Here's what I got.

Explanation:

Interestingly enough, I'm not getting

0.0341% w/v

either. Here's why.

Start by calculating the percent composition of chlorine,

Cl

, in calcium chloride, This will help you calculate the mass of chloride anions,

Cl

−

, present in your sample.

To do that, use the molar mass of calcium chloride, the molar mass of elemental chlorine, and the fact that

1

mole of calcium chloride contains

2

moles of chlorine atoms.

2

×

35.453

g mol

−

1

110.98

g mol

−

1

⋅

100

%

=

63.89% Cl

This means that for every

100 g

of calcium chloride, you get

63.89 g

of chlorine.

As you know, the mass of an ion is approximately equal to the mass of the neutral atom, so you can say that for every

100 g

of calcium chloride, you get

63.89 g

of chloride anions,

Cl

−

.

This implies that your sample contains

0.543

g CaCl

2

⋅

63.89 g Cl

−

100

g CaCl

2

=

0.3469 g Cl

−

Now, in order to find the mass by volume percent concentration of chloride anions in the resulting solution, you must determine the mass of chloride anions present in

100 mL

of this solution.

Since you know that

500 mL

of solution contain

0.3469 g

of chloride anions, you can say that

100 mL

of solution will contain

100

mL solution

⋅

0.3469 g Cl

−

500

mL solution

=

0.06938 g Cl

−

Therefore, you can say that the mass by volume percent concentration of chloride anions will be

% m/v = 0.069% Cl

−

−−−−−−−−−−−−−−−−−−−

I'll leave the answer rounded to two sig figs, but keep in mind that you have one significant figure for the volume of the solution.

.

ALTERNATIVE APPROACH

Alternatively, you can start by calculating the number of moles of calcium chloride present in your sample

0.543

g

⋅

1 mole CaCl

2

110.98

g

=

0.004893 moles CaCl

2

To find the molarity of this solution, calculate the number of moles of calcium chloride present in

1 L

=

10

3

mL

of solution by using the fact that you have

0.004893

moles present in

500 mL

of solution.

10

3

mL solution

⋅

0.004893 moles CaCl

2

500

mL solution

=

0.009786 moles CaCl

2

You can thus say your solution has

[

CaCl

2

]

=

0.009786 mol L

−

1

Since every mole of calcium chloride delivers

2

moles of chloride anions to the solution, you can say that you have

[

Cl

−

]

=

2

⋅

0.009786 mol L

−

1

[

Cl

−

]

=

0.01957 mol L

−

This implies that

100 mL

of this solution will contain

100

mL solution

⋅

0.01957 moles Cl

−

10

3

mL solution

=

0.001957 moles Cl

−

Finally, to convert this to grams, use the molar mass of elemental chlorine

0.001957

moles Cl

−

⋅

35.453 g

1

mole Cl

−

=

0.06938 g Cl

−

Once again, you have

% m/v = 0.069% Cl

−

−−−−−−−−−−−−−−−−−−−

In reference to the explanation you provided, you have

0.341 g L

−

1

=

0.0341 g/100 mL

=

0.0341% m/v

because you have

1 L

=

10

3

mL

.

However, this solution does not contain

0.341 g

of chloride anions in

1 L

. Using

[

Cl

−

]

=

0.01957 mol L

−

1

you have

n

=

c

⋅

V

so

n

=

0.01957 mol

⋅

10

−

3

mL

−

1

⋅

500

mL

n

=

0.009785 moles

This is how many moles of chloride anions you have in

500 mL

of solution. Consequently,

100 mL

of solution will contain

100

mL solution

⋅

0.009785 moles Cl

−

500

mL solution

=

0.001957 moles Cl

−

So once again, you have

0.06938 g

of chloride anions in

100 mL

of solution, the equivalent of

0.069% m/v

.

Explanation:

i think this is it

The correct options are (1) and (4).  During the reaction, the mass of the Zn(s) electrode decreases as it is oxidized, and the mass of the Cu(s) electrode increases as it is reduced.

In a chemical cell, a redox reaction occurs, and the electrons are transferred from one electrode to another. In this case, the reaction is:

Zn(s) + Cu2+(a q)  → Zn2+(a q) + Cu(s)

At the anode, which is the electrode where oxidation occurs, Zn atoms lose electrons and form Zn2+ ions in solution:

Zn(s) → Zn2+(a q) + 2e-

These electrons flow through an external wire to the cathode, where they are accepted by Cu2+ ions and copper metal is deposited:

Cu2+(a q) + 2e- → Cu(s)

Which means that during the reaction, the mass of the Zn(s) electrode decreases as it is oxidized, and the mass of the Cu(s) electrode increases as it is reduced. The concentration of Cu2+ ions in solution stays the same, as it is not involved in the electrode reactions. The concentration of Zn2+ ions in solution increases as Zn(s) is oxidized to form Zn2+ ions.  The correct answers are (1) and (4).

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The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.

Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

Therefore,  the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

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