15 and extra credit not 14

The density, in g/L, of an ideal gas when it is at 1.48 atm and 94.06 °C is 6.67g/L.

The density of an ideal gas can be calculated by dividing the mass of the substance by its volume in litres.

According to this question, the pressure and temperature of the ideal gas is given. The number of moles occupied by the gas can be calculated as follows;

PV = nRT

1.48 × 22.4 = n × 0.0821 × 367.06

33.152 = 30.14n

n = 1.1 moles

mass of gas = 1.1 mol × 145.63g/mol = 160.18g

Density = 160.18g ÷ 22.4L = 6.67g/L

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During burning, elements in the coal are  converted to compounds called oxides.

An oxide is a compound formed by combination of an element with oxygen. Usually, when an element is burnt in oxygen, it combines with oxygen in the presence of heat to form oxides.

Coal contains carbon, nitrogen and sulfur. When coal is burnt, these elements combine with oxygen to form oxides. The products of combustion of coal are oxides of sulfur, oxides of carbon and oxides of nitrogen.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question

mass = 15.5 g

density = 6.89 g/mL

We have

\(volume = \frac{15.5}{6.89} \\ = 2.249637155...\)

We have the final answer as

Hope this helps you

Answer:

i think sulfur fluoride

The final temperature of the mixture given that 25 g of water at 25 °C is mixed with 25 g of water at 65 °C, is 45 °C

The final temperature of the mixture can be obtained by calculating the equilibrium temperature of the mixture. This is shown below:

Heat loss by warm water = Heat gain by cold water

MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)

Cancel out C

Mᵥᵥ(Tᵥᵥ - Tₑ) = M(Tₑ - T)

25× (65 - Tₑ) = 25 × (Tₑ - 25)

Cancel out 25

65 - Tₑ = Tₑ - 25

Collect like terms

65 + 25 = Tₑ + Tₑ

90 = 2Tₑ

Divide both side by 2

Tₑ = 90 / 2

Tₑ = 45 °C

Thus, we can conclude that the final temperature the mixture is 45 °C

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Answer:

CaCO3 (calcium carbonate)

Explanation:

When adding water, CaCl2 (calcium chloride) is soluble, whereas calcium carbonate is not.

This means the calcium chloride will dissolve in the water but the calcium carbonate will not.

When it is filtered, the dissolved calcium chloride will pass straight through the filter paper with the water, whereas the calcium carbonate will be left as a residue as it is insoluble.

Hope this helps! Let me know if you have any questions :)

a. NO (nitrosyl) is more likely to gain an electron compared to CN (cyanide). This is because the electron density of the nitrogen atom in NO is higher, due to the presence of the unpaired electron in its lowest unoccupied molecular orbital (LUMO), which makes it a more attractive site for accepting electrons.

b. (N2)2+ is more likely to gain an electron compared to (O2)2+. This is because nitrogen atoms have a higher electronegativity compared to oxygen atoms, which means nitrogen attracts electrons more strongly. As a result, the electron density in the LUMO of N2 is higher, making it a more attractive site for accepting electrons.

Answer:

Isopropanol and dichloromethane, distilled well below their boiling point.

Explanation:

The best way to separate isopropanol and dichloromethane is the method of fractional distillation. In this method, different compounds separate from each other due to difference in boiling. The boiling point of dichloromethane is 39.6 degree Celsius which is lower than the boiling point of isopropanol which is 82.5 degree Celsius. So dichloromethane will be evaporated when the temperature reaches to 40 degree Celsius and separated from isopropanol before reaching its boiling point.

Answer:

the correct answers are A,D,E, and G

Explanation:

Answer:

The relative formula mass of H₂O can be calculated by adding the atomic masses of two hydrogen atoms and one oxygen atom in the molecule. The atomic mass of hydrogen is 1 and the atomic mass of oxygen is 16. So, the relative formula mass of H₂O is:

(2 x 1) + 16 = 18

Explanation:

The evidence in figure 2 and table 1 which describes the changes in the rock after a year is the presence of a round edge.

This is referred to as the breaking down or dissolving of rocks and minerals on Earths surface through elements such as wind, water etc.

In the diagram given, the rock previously had a sharp edge but as time went on there was breakdown of the edges which resulted in it becoming round and is therefore the evidence that weathering most likely occurred in the rock.

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Answer:

Salt domes storage has advantages in cost, security, environmental risk, and maintenance. Salt formations offer the lowest cost, most environmentally secure way to store crude oil for long periods of time. Stockpiling oil in artificially-created caverns deep within the rock-hard salt costs historically about $3.50 per barrel in capital costs. Storing oil in above ground tanks, by comparison, can cost $15 to $18 per barrel - or at least five times the expense. Also, because the salt caverns are 2,000-4,000 feet below the surface, geologic pressures will sea; any crack that develops in the salt formation, assuring that no crude oil leaks from the cavern. An added benefit is the natural temperature differential between the top of the caverns and the bottom - a distance of around 2,000 feet; the temperature differential keeps the crude oil continuously circulating in the caverns, giving the oil a consistent quality.

Hamilton explained the choice on the On Purpose show, admitting that the pair's work connection from karting to F1 had placed a burden on an otherwise strong friendship.

Lewis Hamilton now has a close connection with his father Anthony, but this was not always the case during his Formula One tenure. Anthony had a significant influence on his son's career, notably working multiple jobs to finance Hamilton's early foray into racing until he was signed by McLaren at the age of 11.

However, his earnings outside of Formula One rose from $8 million in 2021 to $12 million in 2022. Hamilton was the highest-paid Formula One racer. He has profitable agreements with companies such as Monster energy drinks.

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When the pressure is doubled and the temperature increases to 500 K, the volume of the fluorine gas is approximately 497 mL.

To determine the volume of fluorine gas when the pressure is doubled and the temperature increases, we can use the combined gas law. The combined gas law equation relates the initial and final states of a gas under different conditions. It can be written as:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

Given:

P1 = 2 atm

V1 = 410 mL

T1 = 206 K

P2 = 2 atm × 2 = 4 atm (pressure is doubled)

T2 = 500 K (temperature increases)

We need to find V2, the final volume.

Substituting the given values into the combined gas law equation, we have:

(2 atm × 410 mL) / (206 K) = (4 atm × V2) / (500 K)

Cross-multiplying and simplifying the equation, we get:

(2 atm × 410 mL × 500 K) = (4 atm × V2 × 206 K)

Now, we can solve for V2:

V2 = (2 atm × 410 mL × 500 K) / (4 atm × 206 K)

V2 ≈ 497 mL

Therefore, when the pressure is doubled and the temperature increases to 500 K, the volume of the fluorine gas is approximately 497 mL.

It's important to note that we assumed the gas behaves ideally and followed the combined gas law equation. In reality, deviations from ideal gas behavior can occur at high pressures or low temperatures, so the calculated value is an approximation based on the ideal gas law..

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Answer:

reduce water loss  

absorb sunlight

take in carbon dioxide

produce oxygen

Explanation:

i think

Answer:

A, D, and E

Reduces water loss, take in carbon dioxide, and produce oxygen.

Explanation:

By analyzing the potential energy diagrams and calculating ΔH using bond energies, we can determine whether a reaction is exothermic (ΔH < 0) or endothermic (ΔH > 0).

To create potential energy diagrams for chemical reactions and determine the value of ΔH (the change in enthalpy) for each reaction, we need to understand the basic concepts and steps involved.

Potential Energy Diagram: A potential energy diagram is a graphical representation of the energy changes that occur during a chemical reaction. The vertical axis represents the potential energy, while the horizontal axis represents the progress of the reaction.

Reactants and Products: Identify the reactants and products involved in each reaction. Assign them appropriate labels on the potential energy diagram.

Activation Energy: Determine the activation energy (Ea) for each reaction. It represents the energy barrier that must be overcome for the reaction to occur. On the diagram, the reactants' energy level is typically higher than the products' energy level, with the activation energy peak in between.

Transition State: Locate the highest point on the potential energy diagram, which represents the transition state or activated complex. This point indicates the highest energy level during the reaction.

ΔH Determination: ΔH represents the difference in enthalpy between the reactants and products. It can be determined by examining the vertical distance between the reactants' energy level and the products' energy level on the potential energy diagram.

ΔH Calculation: ΔH can be calculated using the formula ΔH = Σ (bond energies of reactants) - Σ (bond energies of products). The bond energies are the energy required to break a particular bond or released when a bond is formed.

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Answer:

Wind, ocean currents, waves

Explanation:

The plastic bottle travelled this much distance due to the following factors:

a) Wind

b) Ocean currents

c) Waves

Answer:

Mass of the block = 300g

Heat required         = 2340 J

Change in temp.     = (45 -25) = 20

According to the formula : q = m C (t2 - t1)

                                                 2340  = 300/1000  C 20

                                                        C  = 2340/20 * 1000/300

                                                          C  = 2340/6    =  390

Answer:

Volume is 0.00233mL

Explanation:

Hello,

The density of a substance is the mass per unit volume of that substance.

Density = mass / volume

To solve this question, we need to get our data first.

Data;

Density = 19.3g/mL

Mass = 45mg = 0.045g

Volume = ?

Density = mass / volume

Density (ρ) = mass (m) / volume (v)

ρ = m / v

v = m / ρ

v = 0.045 / 19.3

v = 0.00233mL

The volume of the substance is 0.00233mL

Answer: 1.95 g of oxygen is present.

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

\(p_{total}=p_{methane}+p_{oxygen}\)

Given : \(p_{total}\) =total pressure of gases = 727 mm Hg

\(p_{methane}\) = partial pressure of methane = 571 mm Hg

\(p_{oxygen}\) = partial pressure of oxygen = ?

\(727=571+p_{oxygen}\)  

\(p_{oxygen}=156mmHg\)

Also \(p_{oxygen}=x_{oxygen}\times p_{total}\)

Given : 3.62 g of methane is present

moles of methane = \(\frac{\text{Given mass}}{\text {Molar mass}}=\frac{3.62g}{16g/mol}=0.226moles\)

\(x_{oxygen}\) = mole fraction of oxygen  

=\(\frac{\text {moles of oxygen}}{\text {total moles}}=\frac{y}{y+0.226}\)

\(156=\frac{y}{y+0.226}\times 727\)

\(y=0.061\)

mass of oxygen = \(moles\times {\text {Molar mass}}=0.061\times 32=1.95g\)

Thus 1.95 g of oxygen is present.

Answer:

a)  Fe₂S₃(s) + 6H⁺(aq) ---> 6HBr(g) + Fe³⁺

b) Net ionic equation: Cu²⁺(aq) + CO₃²⁻(aq) ---> CuCO₃(s)

c) No reaction

d) Net ionic equation: Bi(OH)₃(s) + 3H⁺(aq) ---> Bi³⁺(aq) + 3H₂O

Explanation:

a) This is a double displacement reaction between solid iron(iii) sulphide and hydrobromic acid to produce hydrogen sulphide gas. The full and net equations of the reaction are given below:

Fe₂S₃(s) + 6HBr(aq) ---> 2FeBr₃ + 3H₂S(g)

Net ionic equation:  Fe₂S₃(s) + 6H⁺(aq) ---> 6HBr(g) + Fe³⁺

b) This is a double displacement reaction between potassium carbonate and copper (ii) nitrate to produce insoluble copper (ii) carbonate. The full and net equations of the reaction are given below:

K₂CO₃(aq) + Cu(NO₃)₂(aq) ---> KNO₃(aq) + CuCO₃(s)

Net ionic equation: Cu²⁺(aq) + CO₃²⁻(aq) ---> CuCO₃(s)

c) No reaction as no precipitate is formed

d) This is a neutralization reaction between bismuth (iii) hydroxide and trioxonitrate (v) acid to produce sat and water. The full and net equations of the reaction are given below:

Bi(OH)₃(s) + 3HNO₃(aq) ---> Bi(NO₃)₃(aq) + 3H₂O(l)

Net ionic equation: Bi(OH)₃(s) + 3H⁺(aq) ---> Bi³⁺(aq) + 3H₂O

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

The correct answer is D

Explanation:

Wetlands are environments that are either submerged under water or are frequently wet. Marshes, swamps, bogs, and fens are examples of freshwater wetlands. Here small streams flow into larger streams and wetlands. The correct option is D.

Ecosystems in freshwater wetlands are impacted by transient or ongoing flooding. They are essential habitats for fauna (including migratory species), play a significant role in the regulation of water flow and water quality to entire catchments, and offer shelter for fauna during droughts.

In tropical and subtropical areas, mangrove swamps are coastal wetlands. In brackish to saline tidal waters, they are distinguished by halophytic (salt-loving) trees, shrubs, and other plants.

Thus the correct option is D.

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Answer:

C. Hair dryer

Explanation:

Alternating Current

The other kind of electricity is called alternating current, or AC. Power plants produce this

type of electricity. It is carried by large power lines from the plant to your home. When you

plug a TV, a lamp, or a hair dryer into the wall socket, you are using this type of electricity.  

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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This is displacement reaction.

What causes the changes in the ice ages is when the earth's orbits tilts.

The ice ages are caused by changes in Earth's orbit and tilt, which affect the amount of solar radiation received by the planet. These changes alter the climate and trigger the growth and retreat of ice sheets.

We know that the changes in the climates is responsible for most of the changes that we can see in the universe as we have come to experience it today.

Thus the earth's orbits is what does control the changes in the ice ages.

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