A ball has a density of 0.5 g/cm³ and a volume of 2g. Calculate the mass of the ball.

250 days makes 0.68 years

The term conversion factor has to do with the factor that could be used to convert a value form one unit of measurement to another. We have to note that these units must be dimensionally correct such that the affected units can cancel out.

We have that;

1 year is made up of 365 days

We now have to set up the dimensions for the conversion of 250 days to years.

Thus;

250 days * 1 year/365 days

= 0.68 years

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Answer:

I think it's c

Explanation:

c seems like the best answer

Answer:

C since that has to be correct.

The total pressure of the solution is 123.5 mmHg

We know that the total pressure of a system is the sum of the individual partial pressures of the components of the mixture. This is the postulation of the Daltons law of partial pressure.

Having said that, the total vapor pressure above this solution is the sum of the vapor pressures of pure benzene and pure toluene. If this is established, it now follows that;

Total pressure = pressure of pure benzene + pressure of pure toluene

= 95.1 + 28.4 mmHg = 123.5 mmHg

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The elements that would form metallic bonds are as follows:

A metallic bond in chemistry is a chemical bond in which mobile electrons are shared over many nuclei and therefore, leads to electrical conduction.

Metallic bonds are formed strictly by metallic elements in the periodic table.

Iridium is a chemical element with symbol Ir with an atomic number of 77. It is a very hard, brittle, silvery-white transition metal.

Iron is also a metallic chemical element with symbol Fe.

Therefore, the elements that would form metallic bonds are as follows:

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Answer:

Iridium

Cadmium

Iron

Explanation:

Test.

The maximum mass of sodium chlorate that will dissolve in 40g of water 30 degrees is 3.98816 g.

The maximum mass is the theoretical yield that can be produced in a chemical reaction.

Given that, the temperature T is 30°C

The mass is 40 grams

S = 0.0043302 + 0.084330 + 3.5714 = 9.9704 g Sodium chlorate per 100 g water

Since 100 g of water can dissolve 9.9704 g of Sodium chlorate

By the formula of maximum mass

40 g of water can dissolve

(9.970440) / 100  = 3.98816 g Sodium chlorate

Thus, the maximum mass of sodium chlorate is 3.98816 g.

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The mass of camphor (C₁₀H₁₆O) that contains 1×10⁹ hydrogen atoms is 1.58×10⁻¹⁴ g

We'll begin by obtaining the mole of hydrogen that contains 1×10⁹ atoms. This can be obtained as follow:

From Avogadro's hypothesis,

6.02×10²³ atoms = 1 mole of hydrogen

Therefore,

1×10⁹ atoms = (1×10⁹ atoms × 1 mole) / 6.02×10²³ atoms

1×10⁹ atoms = 1.66×10⁻¹⁵ mole of hydrogen

Now, we shall determine the mole of C₁₀H₁₆O that contains 1.66×10⁻¹⁵ mole of hydrogen. This is illustrated below

16 moles of H is present in 1 mole of C₁₀H₁₆O.

Therefore,

1.66×10⁻¹⁵ mole of H will be present in = (1.66×10⁻¹⁵ × 1) / 16 = 1.04×10⁻¹⁶ mole of C₁₀H₁₆O

mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of C₁₀H₁₆O = 1.04×10⁻¹⁶ × 152

Mass of C₁₀H₁₆O = 1.58×10⁻¹⁴ g

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Taking into account the reaction stoichiometry, 112.61 grams of lead(II) iodide, PbI₂, are produced from 81.1 g of potassium iodide, KI.

In first place, the balanced reaction is:

2 KI + Pb(NO₃)₂  → PbI₂+ 2 KNO₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

That is, what is intended with it is to find the fourth term of a proportion knowing the other three.  

If the relationship between the magnitudes is direct, the direct rule of three must be applied using the following formula, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: x= (c×b)÷a

The following rule of three can be applied: if by reaction stoichiometry 332 grams of KI form 461 grams of PbI₂, 81.1 grams of KI form how much mass of PbI₂?

mass of PbI₂= (81.1 grams of KI× 461 grams of PbI₂)÷ 332 grams of KI

mass of PbI₂= 112.61 grams

Then, 112.61 grams of lead(II) iodide, PbI₂, are produced from 81.1 g of potassium iodide, KI.

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The mass of water evaporated is 32.7 g.

The term evaporation is the movement of the molecules of water from the surface of the water into the atmosphere. The molecules that move are the more energetic molecules that are able to break away from the attractive field of the surface of the water.

We have the original mass of the water as 455.2 g and the mass of the water after evaporation as 422.55 g. The difference between the two according to the right number of significant figures is 455.2 g - 422.55 g = 32.7 g

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Answer:

both because water changes to ice in a freezer and liquid turns into gas when heated at a certain temperature

Answer:

25400 liters

Explanation:

1 cubic meter is 1000 liters

25.4 cubic meter is 25.4×1000 liters= 25400

Regular maintenance inspections and the replacement of damaged underground tanks are necessary to prevent gasoline leaks.

Therefore, gasoline leaks can be avoided by performing routine maintenance checks and replacing damaged underground tanks.

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The DNA could be damaged by heavy metals.

The term heavy metals are metals that are known to cause a lot of damage in the body. These metals include but are not limited to cadmium, arsenic and nickel. We know the DNA to be the genetic material that is found in humans. It is composed of complementary base pairs held together by hydrogen bonds.

The presence of these heavy metals are able to damage the genetic materials in DNA and are able to disrupt the pathways of the repair of damaged DNA.

2) The release of heavy metals into the atmosphere has led to a lot of heath challenges especially the fact that they have been known to be carcinogenic. It then follows that the companies that release heavy metals into land and water ecosystems should be penalized for the damage that the are causing to the environment as well as to human health when this metals enter human system via these sources.

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The separation methods for homogeneous and heterogeneous mixtures compared are A homogeneous mixture could be separated through distillation, while a heterogeneous mixture could be separated through filtration. The correct option is 1.

A homogeneous mixture is a mixture that contains a substance that remains homogeneous throughout the solution. The solution of salt and water is a homogeneous mixture.

Thus, the correct option is 1. Distillation can be used to separate homogeneous mixtures, while filtering can be used to separate heterogeneous mixtures.

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The moles of [tex]N_2[/tex] and [tex]H_2[/tex] that were present originally in the reaction will be 1.5 moles and 2.5 moles respectively.

The two reactants,  [tex]N_2[/tex] and [tex]H_2[/tex], react in a closed container to form [tex]NH_3[/tex]. The normal stoichiometric ratio of the reaction is according to the following equation:

[tex]N_2 (g) + 3H_2 (g) --- > 2NH_3 (g)[/tex]

The stoichiometric ratio of  [tex]N_2[/tex], [tex]H_2[/tex], and [tex]NH_3[/tex] is 1:3:2.

This means for every 1 mole of ammonia formed, 0.5 moles of [tex]N_2[/tex] and 1.5 moles of [tex]H_2[/tex] is required.

However, 1 mole of [tex]N_2[/tex] and 1 moles of [tex]H_2[/tex] remained after the reaction has ceased.

Thus, total amount of  [tex]N_2[/tex] present originally = 1 + 0.5

                                                                           = 1.5 moles

Total amount of  [tex]H_2[/tex] present originally = 1 + 1.5

                                                               = 2.5 moles

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The molecular formula is [tex]\\C_{7}H_{21} F_{7}[/tex].

The formulas that a compound could have are about three. The empirical formula shows the ratio of the atoms in the compound. The molecular formula shows the actual number of atoms of each element that we have in any particular compound. The structural formula can be used to deduce the arrangement of atoms in the compound.

We can now obtain the empirical formula using;

Mass of carbon = 0.1935 g

Number of moles of carbon =  0.1935 g/ 12 g/mol = 0.016 mole

Mass of hydrogen = 0.0325 g/1 g/mol = 0.0325 moles

Mass of fluorine =  0.2043 g/19 g/mol = 0.011 moles

We now have to divide through by the lowest number of moles ;

C - 0.016 mole/0.011 moles   H - 0.0325 moles/0.011 moles F- 0.011 moles /0.011 moles

C – 1  H – 3 F – 1

The empirical formula is [tex]\\CH_{3}F[/tex]

Molar mass of the empirical formula = 12 + 3 + 19 = 34 g/mol

Molecular formula = 34n = 240.23

n = 240.23/34

n = 7

The molecular formula is [tex]\\C_{7}H_{21} F_{7}[/tex].

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The volume of 0.122 M hydrobromic acid required to react completely with 142 mL of 0.166 M lithium sulfide is 386 mL

2HBr(aq) + Li₂S (aq) → H₂S (g) + 2LiBr

From the balanced equation above,

From the question given above, the following data were obtained:

CaVa / CbVb = nA / nB

(0.122 × Va) / (0.166 × 142) = 2

(0.122 × Va) / 23.572 = 2

Cross multiply

0.122 × Va = 23.572 × 2

Divide both side by 0.122

Va = (23.572 × 2) / 0.122

Va = 386 mL

Thus, the volume of hydrobromic acid required for the reaction is 386 mL

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Answer:

If a measurement closely matches the recognized standard for that measurement, it is considered accurate.

Explanation:

Precision:

“Precision means how close the measured values are to each other.”

A precise measurement is one that has less absolute uncertainty.

Measurement of Precision:

The Precision of measurement is found out by the instrument being

used. It is described by the least count of the measuring instrument. The smaller a physical quantity, the more precise instrument should be used.

Example:

Let the length of a pencil is measured with a meter rod and vernier caliper.

It shows that readings of the vernier caliper are more precise than the metering rod.

A cup is 240 ml and the cake recipe calls for 170.0 ml of milk. It's 2/4 of a cup.

the cups have a standard measure of 240ml, that is, if you buy one of these good quality utensils, even if in different places, the measure of 1 cup must always be equivalent to 240ml.

With this information, we can conclude that Ml is the abbreviation milliliter, the smallest unit of measurement for liquids. We start with the liter as the base unit, we must go down to one tenth of a liter, which is deciliter, then 100 tenths of a liter than the centiliter and we go up to one thousand tenths of a liter, which is milliliter. One liter contains one thousand milliliters.

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The needle is pointing between the second and third dash from 80, towards 90, that means it could be around 82.5kgs on the scale. therefore, weight in lbs will be 181.88.

There the weight on scale is 181.88 lbs.

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Answer:

82.3

Explanation:

If you look close at it, it should be between 82 and 83. Ask which one is it more closer to it should be 82 but not too close or not too far where it would be 82.5. It is in the middle of 82 and 82.5 so what is in between that? It would be 82.3.

The amount of calories consumed in 365 day is 10877 calories.

Energy is the ability to do work.

Energy is present in the food that we eat such carbohydrates, protein, and lipid,

The SI unit of energy is Joules.

However, calories is the unit used in measuring energy found in foods.

For carbohydrate, the energy in calorie present per gram of carbohydrate is 3.87 cal/g.

The 20.0 ounce  bottle of Mountain Dew contains 77.0 g of sugar.

Amount of energy in one bottle = 3.87 * 77 = 298 cal

In 365 days, amount of calories consumed = 298 cal * 365

amount of calories consumed = 10877 calories

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The mass of sodium that remains is 2.38 g

We know that radioactivity refers to the spontaneous disintegration of the sample leading to the emission of radiation. The half life is the time taken for only half of the number of atoms in the sample to remain.

We know that;

No = amount of sodium initially present

N = amount of sodium after time t

t1/2 = half life of sodium

t = time taken for t amount remain

No = 152.0 mg

N = ??

t1/2 = 14.8 hours

t = 3.7 days or 88.8 hours

Using

N/No = (1/2) ^t/t1/2

N/152 =  (1/2) ^88.8/14.8

N =  (1/2) ^88.8/14.8 * 152

N = 2.38 g

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They wanted all nations to focus on domestic issues and not get involved with each other.

Churchill stated, "I conceived an admiration for him as a statesman, a man of affairs, and a war leader," following Roosevelt's death on April 12, 1945. He was the best American friend that Britain has ever found, continued Churchill. The "Special Relationship" was created by their close personal relationship.

Along with agreeing to include France in Germany's postwar governance, Roosevelt, Churchill, and Stalin also agreed that Germany should bear some, but not all, of the burden of making reparations after the war.

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The equilibrium spacing between the ions is 0.24 nm and the bonding energy is 5.3 eV.

The amount of energy required to separate the atoms forming a molecular bond into free atoms is known as bond energy, and it serves as a gauge of the strength of a chemical connection.

For Na⁺ and Cl⁻ ion pair, the attractive and repulsive energies are E(A) and E(R). The energies depend on the distance between the ions r.

We have,

E(A) = ( -1.436 / r )

E(R) = ( 7.32 × 10⁻⁶ / r⁸ )

(a) The plot for E(N), E(R), and E(A) versus r up to 1 nm is attached below.

(b) From the plot,

r(0) = 0.24 nm

E(0) = 5.3 eV

Hence, the equilibrium spacing r(0) between Na⁺ and Cl⁻ ions is 0.24 nm and the bonding energy is 5.3 eV.

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The new volume of a weather balloon initially calibrated at 0.00 °C to have a volume of 12.0 L is 10.15L.

The volume of a given gas at a constant pressure can be calculated using the Charles's law equation as follows:

V₁/T₁ = V₂/T₂

Where;

According to this question, a weather balloon is calibrated at 0.00 °C to have a volume of 12.0 L. The new volume at -42.0 °C assuming pressure is held constant can be calculated as follows;

12/273 = V/231

V = 10.15L

Therefore, 10.15L is the volume of the weather balloon.

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The unknown temperature of the second sample is 80 degree C

In the law of conservation of energy, energy neither be created nor be destroyed - only it change one form to another form of energy.

Now,

Mass of the first sample of water , m1 = 100 g

Initial temperature for first sample , t1 = 20 degree C

Mass of the second sample of water , m2 = 100 g

Initial temperature of the second sample , t2 = ?

Final temperature for first sample = 40 degree C

c is known as the specific heat of the water

Now we are solving this problem the law of conservation of energy

Q(gain) = - Q(lost)

(m1c(delta t)1) = -(m2(delta t)2)

m1(Final temperature- t1) = - m2(Final temperature- t2)

t2 - Final temperature = m1(Final temperature- t1) / m2

t2 - 40 = 100 (40 - 20) / 100

t2 - 40 = 20

t2 = 20 + 40

t2 = 80 degree C

Hence, the initial temperature of second sample is 80 degree C

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