Here’s another one guys please help.

Answer:

Mass of benzene required = 0.78 g

Explanation:

Given data:

Mass of CO₂ produced = 2.66 g

Mass of benzene required = ?

Solution:

Chemical equation:

2C₆H₆ + 15O₂       →    6H₂O + 12CO₂

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 2.66 g/ 44 g/mol

Number of moles = 0.06 mol

Now we will compare the moles of CO₂ with C₆H₆.

                        CO₂       :        C₆H₆

                            12        :          2

                          0.06      :        2/12×0.06=0.01 mol

Mass of benzene required:

Mass = number of moles × molar mass

Mass = 0.01 mol × 78.11 g/mol

Mass = 0.78 g

Answer:

15 grams of water

Explanation:

15 grams of water of water would lose heat the faster compared to higher masses of water.

Water generally is a poor conductor heat.

Answer:

d

Explanation:

Answer:

ionic radii is a half the distance between two ions

Explanation:

''

Answer:

0.00121 atm

Explanation:

Step 1: Given data

Step 2: Calculate the pressure exerted by the column of water in SI units

The pressure exerted by the column of liquid depends on the height of the column, the density of the liquid and the gravitational constant. We can calculate it using the following expression.

P = ρ × g × h

P = 1.00g/cm³ × 9.80665 m/s² × 12.5 m

P = 123 Pa

Step 3: Convert "P" to atm

We will use the conversion factor 101325 Pa = 1 atm.

123 Pa × (1 atm/101325 Pa) = 0.00121 atm

Answer:

H3PO4 is the formula for hydrophosphoric acid

The chemical formula of hydrophosphoric acid is H₃PO₄ which is a mineral acid of phosphorous.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

Explanation:

A genus is a group that includes a number of very closely related species; a species within a genus includes populations of organisms that can potentially interbreed.

Solution :

In the process to isolate gold that has a 80 percent yield, a 3.00 g of Au is being isolated.

That is, the actual yield of Au is 3. 00 g

Therefore, we need to find the theoretical yield.

As we know,

[tex]$\text{percent yield}=\frac{\text{actual yield}}{\text{theoretical yield}} \times 100$[/tex]

[tex]$\text{theoretical yield}=\frac{\text{actual yield}}{\text{present yield}} \times 100$[/tex]

As actual yield = 3.00 g

    percent yield = 80 %

So, theoretical yield = [tex]$\frac{3.00}{80} \times 100$[/tex]

                                  = 3.75 g

Thus he should be able to get 3.75 g which is the theoretical yield of Au.

Answer:

choice A

Explanation:

it it occurs when a gas escapes from a container through a hole of diameter.

Answer:

A. It occurs when a gas passes through a tiny hole.

Explanation:

Edge2020

Have a great day y'all :)

Answer:

[tex]m=0.0325g[/tex]

Explanation:

Hello!

In this case, since the collection of gases over at certain conditions implies the usage of the ideal gas equation and computation of the pressure of the gas by subtracting the vapor pressure of water (21.7 torr at 23.7 °C) to the total pressure as shown below:

[tex]p_N=706-21.7=684.3torr =0.900atm[/tex]

Next step is to compute the moles of nitrogen at the given conditions:

[tex]n=\frac{PV}{RT}=\frac{0.900atm*0.0314L}{0.08206\frac{atm*L}{mol*K}*296.85K} \\\\n=0.00116mol[/tex]

Final step is to compute the mass by knowing that gaseous nitrogen has a molar mass of 28.02 g/mol:

[tex]m=0.00116mol*\frac{28.02g}{1mol} \\\\m=0.0325g[/tex]

Regards!

The mass of nitrogen gas that was collected is 0.0336 grams.

Given the following data:

Scientific data:

To determine the mass of nitrogen gas that was collected:

First of all, we would calculate the number of moles of nitrogen gas used by using the ideal gas law equation:

[tex]n = \frac{PV}{RT}[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]n = \frac{0.93 \times 0.0314}{0.0821 \times 296.7}\\\\n=\frac{0.0292}{24.36}[/tex]

n = 0.001199 moles

For the mass of nitrogen gas:

[tex]Mass = n \times molar \;mass\\\\Mass = 0.001199 \times 28.02[/tex]

Mass = 0.0336 grams

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Answer:

action, reaction

Explanation:

Answer:

for every action there is an equal and opposite reaction

Answer:

As the thermal energy of matter increases, its particles usually spread out, causing the substance to expand.

Explanation:

i have a book about this stuff

As the thermal energy of matter increases, its particles usually spread out,

causing the substance to expand.

Thermal energy is the energy which is measured as a result of its heat

content. This is usually as a result of the increase in temperature of the

substance involved.

Increase in temperature leads to an increase in thermal energy. This leads

to the particles spreading out and the substance expanding as a result of

the atoms being loosely held together.

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Answer:

b)

Explanation:

Resonance structure differ by placement of electrons only.

I hope you got the answer

‍♂️

Answer:

a

Explanation:

because it fits the diagonal trend that point toward the upper right

Answer:

answer is

Explanation:

Gallium because it has the properties which you have mentioned

The element of Group 13 would most likely have a physical and chemical properties of brittle, shiny, semiconductor, and is silver is gallium. The correct option is B.

Gallium is a chemical substance with the atomic number 31 and indeed the emblem Ga.

Gallium belongs to periodic table group 13 and is chemically similar to the other metals in the group. In standard temperature and pressure, gallium is a soft, silvery metal.

It finds widespread application in Blu-ray technology, mobile phones, blue and green LEDs, and pressure sensors for touch switches. Gallium readily alloys with the majority of metals.

It is especially useful in low-melting alloys. Because of its high boiling point, it is ideal for recording temperatures that would vaporize a thermometer.

Gallium is a rare element on Earth, but its abundance is comparable to that of lithium and lead, with a content of 19 ppm in the continental crust.

Thus, the correct option is B.

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Answer:

that is an invalid question

The word equation for this reaction is:

Sodium carbonate + Sulfuric acid → Sodium sulfate + Carbon dioxide + Water.

The given chemical equation represents a chemical reaction between sodium carbonate (Na₂CO₃) and sulfuric acid (H₂SO₄). When these two substances react, they undergo a chemical change and produce different compounds. The reaction results in the formation of sodium sulfate (Na₂SO₄), carbon dioxide (CO₂), and water (H₂O).

In a word equation, the chemical reaction is described using the names of the substances involved rather than their chemical formulas. Hence, the word equation for this reaction would be:

Sodium carbonate + Sulfuric acid → Sodium sulfate + Carbon dioxide + Water.

This word equation provides a simple and concise description of the reactants and products involved in the chemical reaction, allowing for a better understanding of the overall transformation of substances that occurs during the reaction.

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Answer:

The independent variable is the variable that is deliberately changed by the scientist. The dependent variable is the one observed during the experiment. The dependent variable is the data we collect during the experiment.

Answer:

The first option is the correct option

Explanation:

Copper is one of the transition elements which are normally found in the d-block. Generally, transition elements that have low oxidation number/charge usually undergo ionic/electrovalent bonding, while those that have a relatively higher oxidation number/charge usually undergo covalent bonding. Copper has charges ranging from 1+, 2+ or 3+ and thus will normally undergo ionic bonding which involves the gain or loss of electrons to meet the octet rule.

The best description of how atoms bond in a copper sample is; the atoms share electrons in order to achieve a stable octet - a type of bonding called Metallic bonding.

According to the question;

Definition:

A metallic bond is pretty different from covalent and ionic bonds, but the objective of the bonding is the same: to achieve a lower energy state.

Contrary to a bond between just two atoms, a metallic bond is a sharing of electrons between many atoms of a metal element.

P.S: Copper is one of the transition metals with variable oxidation states.

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Answer:

im sorry but i havent reached that topic as of yet

Explanation:

Answer: Bromine water

Explanation:

Alkanes are saturated hydrocarbons with single bond and the alkenes as unsaturated hydrocarbons with double bonds.

Bromine water is a chemical reagent which is used to distinguish between alkane and alkene.

It is of orange color in solution form and turns to colorless in alkene.

The alkanes to show any reaction with bromine water.

Answer:

c) 387g

Explanation:

Water;

Mass = 250g

Specific heat = 4.184

Initial Temp, T1 = 25 + 273 = 298K

Final Temp, T2 = 35 + 273 = 308K

Heat = ?

H = mc(T2 - T1)

H = 250 * 4.184 (308 - 298)

H = 10460 J

Iron;

Initial Temp, T2 = 95 + 273 = 368K (Upon converting to kelvin temperature)

Mass = ?

Final Temp, T1 = 35 + 273 = 308

Heat = 10460 (Heat lost by iron is qual to heat gained by water)

Specific heat = 0.45

H = mc(T2-T1)

M = 10460 / [0.45 (308 - 368)]

M = 10460 / 27

M = 387g

The mass of the iron has been calculated as 387.40 grams.

Specific heat can be defined as the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree celsius.

Since in the reaction there has been no heat loss, the heat released by iron has been equivalent to heat absorbed by the water in the calorimeter.

Heat = mass × specific heat of water × change in temperature

Heat absorbed = 250 grams × 4.184 J/g[tex]\rm ^\circ C[/tex] × (308 K - 298 K)

Heat absorbed = 10460 J

Heat released = mass × specific heat of water × change in temperature

Heat released = mass × 0.45 J/g.K × (308 K - 368 K)

Heat released = mass × 27

Heat released = Heat absorbed

Mass of Iron × 27 = 10460 J

Mass of iron = 387.40 grams.

The mass of the iron has been calculated as 387.40 grams.

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Answer:

Explanation:

2C₄H₁₀ + 13O₂ = 8 CO₂ + 10H₂O

Change in number of moles Δn = 18 - 15 = + 3 moles .

ΔHo = -2658.3 kJ/mol.

ΔHo = ΔEo+ Δn RT

Δn = 3

For one mole Δn = 1.5

ΔHo = ΔEo+ W

W = Δn RT

= 1.5 x 8.31 x 298

= 3714.5 J

= 3.7 kJ /mole

ΔHo = ΔEo+ W

ΔEo =  ΔHo -  W

= -2658.3 - 3.7  kJ

= - 2662 kJ .

(a) The work done for the combustion of 1 mole of methane is 3,714.5 J.

(b) The change in the energy of the given system is -3,991.2 kJ.

The balanced chemical reaction of the given compounds is written as follows;

[tex]2C_4H_{10} \ + \ 13O_2 \ -->\ 8CO_2 \ + \ 10H_2 O[/tex]

The change in number of moles;

[tex]\Delta n = 18 - 15 = 3[/tex]

The work done for the combustion of 1 mole of methane is calculated as follows;

[tex]W = \frac{\Delta n}{2} RT\\\\W = \frac{3}{2} \times 8.31 \times 298\\\\W = 3,714.6 \ J[/tex]

The energy change is calculated as follows;

[tex]\Delta E_0 = \Delta H_o - W\\\\\Delta E_0 = (\frac{3 \ mole}{2} \times-2658.3 \ kJ/mol) - 3.715 \ kJ\\\\\Delta E_0 = -3,991.2 \ kJ[/tex]

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Answer:

D. In both, vibrations occur in a parallel direction to the direction of the wave.

Explanation:

It is not true that in both mechanical and electromagnetic waves, vibrations occur in  parallel direction to the direction of the wave.

As with all waves, they are disturbances that transfers energy without moving the materials of the medium.

Answer:

The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Carbon is the main component of biological compounds as well as a major component of many minerals such as limestone