what is the expected freezing point of a solution containing 85.0g NaCl dissolved in 450g of water

Explanation:

The definition of empirical formula is: "a chemical formula showing the simplest ratio of elements in a compound".

To get the simplest ratio between the elements we will have to cancel the subscripts in the formula.

a) B₂H₆:

In this compound we can divide the subscripts for both elements by two.

So the empirical formula for B₂H₆ is BH₃.

b) C₆H₁₀F₈:

We can also divide the 3 subscripts by 2 and get the empirical formula. It is C₃H₅F₄.

b) C₆H₁₂O₆:

Since 6, 12 and 6 are divisible by 2 and 3, we can divide the subscripts by them to get the simplest ratio of the elements.

The empirical formula is CH₂O.

Answer:

a) BH₃ BH3

b) C₃H₅F₄ C3H5F4

c) CH₂O CH2O

The new volume of the balloon, given that it was submerged to a depth where the pressure is 922.3 mmHg and the temperature is 25.35 °C is 5.08 L

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

The new volume can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(755.4 × 6.25) / 300.5 = (922.3 × V₂) / 298.35

Cross multiply

300.5 × 922.3 × V₂ = 755.4 × 6.25 × 298.35

Divide both side by (300.5 × 922.3)

V₂ = (755.4 × 6.25 × 298.35) / (300.5 × 922.3)

V₂ = 5.08 L

Thus, the new volume is 5.08 L

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Step 1 - What is an spectator ion?

We call spectator ions those that are not directly involved in the reaction. They only "see" the reaction happening, i.e., they are "spectators".

Step 2 - Answering the exercise

The correct answer is thus an ion that is not directly involved in the reaction.

The concentration of ions in the solution is (1) ammonium ion  0.805 M and (2) phosphate ion =  0.268 M.

Concentration is the abundance of a constituent divided with the aid of the entire extent of a combination. numerous types of mathematical descriptions can be distinguished: mass concentration, molar concentration, range concentration, and quantity concentration. awareness is a very not unusual concept utilized in chemistry and related fields. it's by far the measure of how lots of a given substance there is mixed with every other substance.

Calculation:-

mass of ammonium phosphate = 10 g

The molecular mass of  (NH₄)₃PO₄ = 149

moles = mass/molar mass

          = 10/149

          = 0.067 moles

concentration of ammonium ion = 3 × 0.067 moles

                                                    = 0.201 M

concentration = number of moles / volume of solution

                       =    0.067 moles / 250 ml × 1000

                       = 0.268 M

concentration of ammonium ion = 3 × 0.268 M

                                                    = 0.805 M

concentration of phosphate ion =  0.268 M

The concentration of a substance is the amount of solute found in a given quantity of answers. Concentrations are generally expressed in terms of molarity, described as the number of moles of solute in 1 L of the solution.

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Answer:

The strongest conductors are understood to be all metals. Their conductivity is dependent on their atoms' number of valence electrons. Such electrons are not tightly bound together and are free to pass. Metals have electrons like this in their atoms, which is why they conduct heat and electricity so well.

Useful electronic devices are perfect insulators.

Semiconductors are perfect insulators. The electron density in the conduction band at room temperature is not as high as that of metals, so they cannot conduct electricity as well as metals. The electrical conductivity of semiconductors is not as high as metals, but not as bad as electrical insulators. Low power loss. Semiconductors are getting smaller and lighter.

Resistivity is higher than conductors and lower than insulators. The resistance of semiconductor materials decreases with increasing temperature and vice versa. Conductivity level is the main difference between conductors semiconductors and insulators. Conductors are highly conductive. In other words, an energy such as electric heat, and sound can be easily conducted. Semiconductors allow moderate flux while insulators are poor conductors.

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1.00 mole of neon weighs 20.1797 g. This is its periodic table atomic weight in grams. The volume is specified as 22.4 L.

1. 1.00 mole of neon weighs 20.1797 g. This is its periodic table atomic weight in grams. The volume is specified as 22.4 L.

2. This means that 22.4L of gas contains one mole of molecules. As a result, 112 cm3 of gas contains 5 10-3 moles of molecules.

3. The atomic mass of the Cl atom is 35.453 atomic mass units. This is the weighted average mass of chlorine in nature, including its isotopes. This means that one mole of chlorine atoms weighs 35.453 grams.

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According to the given statement Jolie mean by The Moon looks rounded on both sides.

The correct option is A.

Waxing gibbous refers to a moon that is more than halfway full and continues to increase its luminous surface. Gibbous, which means "hump" in Latin, has been used for centuries to refer to rounded or convex forms, such as enlarged eyes or a camel's back.

Gibbous Moon refers to the phase of the Moon when the side that faces Earth appears to be more than half-lit by the Sun but is less than fully lit. From new Moon through full moon and back, the lunar month, which is the full cycle of the Moon's stages, lasts 29 days.

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The complete question is -

Jolie is staring at the Moon with her brother and comments that it looks "gibbous." What does Jolie mean by this

A. The Moon looks rounded on both sides.

B. The Moon looks narrow.

C. The Moon looks narrow on one side and round on the other.

D. The Moon is just a small sliver.

Answer:

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Explanation:

Use science in any way you must follow certain steps to reach certain things  are scientific method.

The scientific method included the following process:

These are the process involved in the scientific method .Scientific method is used in the process of experimentation that helps to explore observations and answers the question.

Science is the application of knowledge and understanding the natural and social world.

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The volume of the sodium hydroxide base that we need is 14.9 mL.

Recall that the reaction between an acid and a base that leads to the formation of salt ad water is what we call a neutralization reaction. It ionically involves the reaction of the hydrogen and the hydroxide ion to form water.

Where CA and CB are the concentrations of the acid and base respectively and VA and VB are the volumes of the avid and base respectively. The reaction is 1:1 as we know.

Hence;

CAVA/CBVB = 1

CAVA = CBVB

VB = CAVA/CB

VB = 0.583 M * 25.0 mL /0.978 M

VB = 14.9 mL

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Bottle should be labelled as Bromine.

Only two elements are liquid at room temperature mercury and Bromine . Helium and chlorine, arsenic are gases.

A chemical element is a species of atom with a certain number of protons in its nucleus, including a pure substance consisting only of that species. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is a defining characteristic of an element and is called its atomic number (denoted by the symbol Z) - all atoms with the same atomic number are atoms of the same element.

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The bottle should relabel as bromine i.e option B

Why bromine is a liquid?

The presence of strong intermolecular interactions prevents bromine from evaporating, Therefore bromine is a liquid.

As it is mentioned in the question, the unidentified element is in a liquid state and is non-metallic. Therefore, it can not be other than bromine due to the following reasons.

• Chlorine and helium both always exist as a gas. So, can not be a liquid

• Arsenic is a metal

Hence, option B is left only and which is correct too.

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The answer is follows:

NaBr -   sodium bromide

calcium acetate   - Ca(C2H3O2)2

sulfur dioxide  - SO2

CuOH  -  copper (I) hydroxide

Hydro phosphoric acid   -  H3P

HF -   hydrofluoric acid

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To solve this question, we need to know the mass number and atomic number of Fe. For this, we look at the periodic table.

Mass number of Fe: 55

Atomic number: 26

- The number of protons is equal to the atomic number of the element. So the number of protons (p+) is 26.

- The number of electrons in an atom that is neutral is the same as its number of protons. In this case, we don't have a neutral atom, we have a cation, Fe²⁺. The charge 2+ means that it lost 2 electrons in relation to its neutral atom. So we just subtract 26 - 2 = 24. The number of electrons (e-) is equal to 24.

- The number of neutrons we calculate using the following formula:

n = A - p

where: n = number of neutrons; A = atomic mass; p = number of protons.

A = 55

p = 26

n = 55 - 26 = 29

n = 29

Answer: p+ = 26

e- = 24

n = 29

Alternative "C"

The efficiency of the thermal rotating space heater is obtained as 64%.

When we talk about the efficiency we talk about the percentage of the useful energy that is expended in order to get work done. Recall that we define the energy as the ability to do work. In this case, we are told that a  rotating space heater used 1,400 joules of energy while heating a room. Of that total, 896 joules produced thermal energy, 181 joules produced kinetic energy, 203 joules produced light energy, and 120 joules produced sound energy as we can see in the question that is shown above.

We know that according to the law of the conservation of energy, energy can not be created nor destroyed hence the sum of the energy that obtained from the  rotating space heater is constant.

In the light of that, the efficiency is;

896 joules/ 1,400 joules * 100/1

= 64%

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Answer:

1. EfficEfficiency= output energy/input energy x 100

2. 64%

3.friction between the box and the inclined plane.

4.640 JOules

5. the lost energy is not truly lost but it changed into a different form.

Explanation:

here you go my little guys

(ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

Answer: The heat capacity of the liquid is greater than the solid for the substance given.

Explanation:

The question requires us to compare the heat capacity of a substance in its liquid and solid state, given a graph of heat gained versus temperature where the phase changes of the substance are indicated.

To solve this problem, we need to keep in mind that heat capacity is defined as the amount of heat necessary to produce a temperature change of one unit, and it is usually given in units of energy per unit of temperature (such as J/K or J/°C). Thus, a greater heat capacity means that more energy will be required to cause the same temperature change.

Looking at the graph provided, we can identify the regions where the substance would be in its liquid, solid and gas state, and also the phase changes:

We can see in the graph that the curve where the substance is a solid "grows faster" compared to the curve for the liquid - it means that the curve for the liquid is "less steep". Consider the following example:

In the image above, Δx for the blue curve is greater than Δx for the green curve, considering the same Δy - therefore, the blue curve is less steep than the green one.

Now, going back to the graph provided in the question, we can say that the curve for the liquid is "less steep" than the solid or, in other words, considering the same temperature change (variation in y), the heat required for the liquid would be greater (variation in x). This means that the heat capacity of the liquid is greater than the solid for the substance given.

Answer:

~3.15815

Explanation:

Approximated Formula: Divide pressure value(bar)  by 1.013

Bar and atm are significant units of pressure where, 1 bar is equal to 0.98 atm. 3.20 bar of pressure is equivalent to 3.15 atm.

Pressure is the force exerted in a surface per unit area. Hence, pressure has the unit of N/m². Pressure of a substance is depending on the volume and temperature.

The standard unit (SI unit) of pressure is atm or atmospheric pressure. Other units of pressure are bar, pascal, torr, mmHg etc. The normal  atmospheric pressure is 1 atm.

The units of pressures can be interchanged with the specific relation between them.

1 bar of pressure = 0.987 atm

then, 3.20 bar = 3.20 bar × 0.987 atm/1 bar = 3.15 atm.

Therefore, 3.20 bar pressure is 3.15 atm .

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For this question, we can use Boyle's Law formula to answer, since this law is an experimental gas law that states that pressure and volume have an inverse relationship. The formula is:

P1V1 = P2V2

We have:

P1 = ?

V1 = 1000 mL

P2 = 160 atm

V2 = 700 mL

Now we add these values into the formula:

P1*1000 = 160*700

P1 = 112 atm

Answer:

3.5x10^3

Explanation:

When plugging this into the calculator and dividing them, the answer you get is 3,500.

In scientific notation, you want the decimal to be after the first number (in this case being the 3).

In 3500, our decimal is after the number (0), so we will be moving this decimal place 3 times to the left in order to be placed after the 3.

Now we have 3.500, and since to go back to the original number we had (3500.) we have to move the decimal back 3 places to the right (moving to the right is a positive number), then our answer would be 3.500x10^3.

Now we have to look for how many significant figures we need in our final answer. Since the numbers in our question are 7.0 and 2.0, they both have a total of 2 significant figures, meaning that our final answer has to have 2 significant figures.

Then, our final answer is 3.5x10^3.

***When multiplying or dividing, we round our final answer to the least number of significant figures in the numbers from our question.

***When adding or subtracting, we round our final answer to the least number of decimal places in the numbers from our question.

The balanced equation is BaCl₂ + H₂SO₄ → BaSO₄ + 2HCI.

Chemical reaction is a type of reaction in which one or more substances means reactants are converted to one or more different substances means products are formed.

The given reaction is

BaCl₂ + H₂SO₄ → BaSO₄ + HCI.

Reactant side        Product Side

Ba = 1                        Ba = 1

Cl = 2                        Cl = 1

H = 2                         H = 1

S = 1                           S = 1

O = 4                         O = 4

Here we can see that in the reactant side there are 2 Cl atoms and on the product side there is 1 Cl atom. Also on the reactant side there are 2 H atoms and on the product side there is 1H atom. To balance the above equation multiply by 2 on the product side.

BaCl₂ + H₂SO₄ → BaSO₄ + 2HCI.

Reactant side          Product Side

Ba = 1                            Ba = 1

Cl = 2                            Cl = 2

H = 2                             H = 2

S = 1                               S = 1

O = 4                             O = 4

From the above equation we can see that the given equation is now balanced.

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NOTE: The given question is incomplete on the portal. Here is the complete question.

Question: Balance the given chemical equation:

BaCl₂ + H₂SO₄ → BaSO₄ + HCI.

The empirical formula is simply the ratio of each atom in the molecule.

The molecular formula is the actual number of each atom in one molecule.

To find it, we need to first find the mass of the empirical formula.

The empirical formula is C₃H₂O, so it has 3 carbon, 2 hydrogen and 1 oxygen.

The mass of these atoms are:

- Carbon: approximately 1.99 x 10⁻²⁰ mg

- Hydrogen: approximately 1.67 x 10⁻²⁰ mg

- Oxygen: approximately 2.66 x 10⁻²⁰ mg

So, the mass of the empirical formula is:

Now, we can see how many of this empirical formula we have in the molecular formula, so we divide the given mass of the molecule by the mass of the empirical mass:

That is, the actual mass of the molecule is double the mass of the empirica formula, which means that we have twice as many of each atom in th molecular formula:

Molecular formula: (C₃H₂O)₂ -> C₆H₄O₂

Pure Aluminum foil ,Gold Bar (pure Au) is element and element is pure substance. distilled water, NaCl (table salt) is pure substances .

Pure substance are the kind of matter which cannot be separated into its constituent particle . pure substance made up of only the one kind of matter.

Element is made up of only one type of atom .An element is a pure substance which contain only one kind of atom and cannot be separated by into simpler substances. Therefore , elements comes under pure substances.

Thus, Pure Aluminum foil ,Gold Bar (pure Au) is element and element is pure substances.  distilled water, NaCl (table salt) is pure substances .

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The enthalpy change of steam reforming of methane is -953 kJ/mol.

The enthalpy change of a reaction is the amount of heat absorbed or evolved when a mole of a substance is formed from its reactants.

The enthalpy change of a reaction may have a positive or negative value.

When the enthalpy change of a reaction has a positive value, the reaction is endothermic, but when the enthalpy change of a reaction has a negative value, the reaction is exothermic.

The enthalpy change of steam reforming of methane is calculated from the equation of the reaction, ΔH°, as given below follows:

Equation of reaction: CH₄ (g) + 2 H₂O (g) ---> CO₂ (g) + 4H₂(g)

The enthalpy change, ΔH°, of the reaction is equal to the sum of the enthalpy of the intermediate reactions.

H₂(g) + 1/2O₂(g) → H₂O(g)  :ΔH₁° = -242 kJ/mol

2H₂(g) + C(s)→ CH₄ (g)   :ΔΗ₂° = -75 kJ/mol

C(s) + O₂(g) → CO₂(g)  :ΔΗ₃° = -394 kJ/mol

ΔH° = 2 × ΔH₁° + ΔΗ₂° + ΔΗ₃°

ΔH° = {2 × (-242) + (-75) + (-394)} kJ/mol

ΔH° = -953 kJ/mol

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Answer : 165 kj/mol

[2(-242 kJ/mol)] + [2(0 kJ/mol)] - [-75 kJ/mol] + [-394 kJ/mol] = 165 kJ/mol

Lemon juice and lime juice are rich sources of citric acid.

Making of lemonade is chemical change.

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Option B is the correct answer.

All others are physical change except chopping onions, because cutting an onion causes a chemical reaction that produces the distinctive onion aroma.

In the given examples,

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Answer:

• General skeleton reaction:

• Balanced reduction half reaction:

• Balanced oxidation half reaction:

• Balanced net ionic equation:

• Full balanced redox reaction:

Explanation:

1st) It is necessary to write the skeleton reaction (unbalanced reaction):

In the reaction, copper (II) chloride react with aluminum to produce aluminum chloride and copper.

2nd) We need to know the oxidation number of each atom in the reaction, then we can find the element that oxidized and the element that id reduced:

Oxidation numbers:

+2 -1 0 +3 -1 0

With the oxidation number we can see that Al goes from 0 to +3, so the aluminum atom oxidizes. And, the copper atom goes from +2 to 0, so it is reduced.

3rd) To write the balanced reduction half reaction, it is necessary to balance all elements except oxygen and hydrogen (in this case, there is no oxygen or hydrogen atoms).

Then, it is important to balance the electrons in each half reaction, so in the Cu half reaction we have to multiply everything by 3:

4th) To write the balanced oxidation half reaction, we have to proceed like in the previous step:

We have to balance the electrons here too, but in this case we have to multiply by 2:

Note: Electron balance is done to cancel out the electrons in both reactions, so we need to have the same number of electrons on each side of the half reactions.

5th) Now, we can write the balanced net ionic equation, without the electrons:

6th) Finally, we can write the full balanced redox reaction, including the other elements, in this case Cl:

The 0.27 * 10-3 g of NaBr is formed.

What do you mean by limiting reactant?

A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent.

HBr(aq) + NaOH(aq) ==> NaBr(aq) + H2O(l)

To solve this question, first, find out the limiting reactant.

To find a limiting reactant,

Divide moles of each reactant by the coefficient in the given balanced equation (1 for each in this case) and whichever is lower is the limiting reactant.

For HBr: 3.2 g HBr x 1 mol HBr / 80.9 g = 0.039 mols HBr

For NaOH: 1.14 g NaOH x 1 mol NaOH / 40 g = 0.028 mols NaOH

Hence, NaOH is a limiting reactant

Theoretical yield of NaBr =  0.028 mols NaOH x 1 mol NaBr / mol NaOH x 103 g NaBr / mol = 0.27 * 10-3 g NaBr.

Hence, the answer is 0.27 * 10-3 g

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Answer:

Explanation:

Here, we want to get the mass of 0.90 mol of lead

To get the mass, we use the following formula:

The atomic mass of lead is 207 amu (this is obtainable from the periodic table)

Thus, we have the mass as: