Which statement best describes what it means when something is classified as a strong acid 

Answer:

The correct answer is B

Explanation:

Educere

aluminium + copper oxide → aluminium oxide + copper. Hence, option B is correct.

A word equation represents a chemical reaction using the names of the substances involved.

aluminium + copper oxide → aluminium oxide + copper correctly shows the word equation for the reaction of aluminium and copper oxide yielding aluminum oxide and copper.

Hence, option B is correct.

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To calculate the freezing point of a 5.00% solution of acetic acid in water (vinegar), we need to use the formula ΔTf = Kf x molality, where ΔTf is the freezing point depression, Kf is the freezing point depression constant, and molality is the concentration of the solute in moles per kilogram of solvent.

To calculate the freezing point of a 5.00% solution of acetic acid in water (vinegar), we first need to calculate the molality of the solution. We can do this using the mass percentage and density of the solution:

Mass of acetic acid = 5.00 g/100 g of solution

Mass of water = 100 - 5.00 = 95.00 g/100 g of solution

Volume of solution = 100 mL = 0.100 L

Mass of solution = 1.006 g/mL x 0.100 L = 0.1006 kg

Moles of acetic acid = 5.00 g / 60.05 g/mol = 0.0833 mol

Molality = 0.0833 mol / 0.1006 kg = 0.8285 mol/kg

Next, we can use the formula ΔTf = Kf x molality to calculate the freezing point depression:

ΔTf = 1.86 °C/m x 0.8285 mol/kg = 1.5426 °C

Finally, we can use the equation ΔTf = Kf x i x molality to solve for the freezing point depression of the solution:

1.5426 °C = Kf x 1 x 0.8285 mol/kg

Kf = 1.8605 °C/m (for acetic acid)

The freezing point depression of the solution is 1.5426 °C, so the freezing point of the vinegar is the normal freezing point of water (0 °C) minus the depression, which is:

Freezing point of vinegar = 0 °C - 1.5426 °C = -1.5426 °C

Therefore, the freezing point of a 5.00% solution of acetic acid in water (vinegar) is approximately -1.54 °C.

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Answer:

HCl (aq) + NaOH (aq) --> H2O (L) + NaCl (aq)

Explanation:

HCl is a strong acid while NaOH is a strong alkali. Hence both should dissociate completely in water and 1 mol of HCl will fully neutralise 1 mol of NaOH.

I'm assuming that Part 2 on molarity is part of a data based question that requires you to calculate the number of moles of NaOH based on the data provided and the equation that you are required to balance. Hence, I can't help you with it as I do not have the values.

Explanation:

An atom is made up of three fundamental subatomic particles which are:

Protons are the positively charged particles in an atom. They are found in the nucleus of the atom.

Neutrons do not carry any charges, like the protons, they occupy the tiny nuclear space.

Electrons are positively charged particles and they occupy the extra-nuclear space of the atom.

Answer:

Depends, you have to give us a table, let me explain how to answer this.

Explanation:

“Inside the nucleus,” because the particle is a proton

For this to be true, it has to have a mass (amu) of 1 and it has to have a positive charge

“Inside the nucleus,” because the particle is a neutron

For this to be true, it has to have a mass (amu) of 1 and it has to have a neutral charge

“Outside the nucleus,” because the particle is a proton

This is instantly wrong because protons are located in the nucleus

“Outside the nucleus,” because the particle is an electron

For this to be true, it has to have a mass (amu) of 1/2000 and it has to have a negative charge

Oxygen and calcium react to generate calcium oxide. The chemical made of calcium and oxygen has the formula CaO. This reaction's chemical formula is 2Ca + O2 2CaO.

the eight types of chemical reactions that are most frequently encountered are: decomposition reaction, combination reaction, combustion reaction, single displacement reaction, double displacement reaction, precipitation reaction, and redox reaction.

The evolution of a gas, precipitate formation, color change, temperature change, and state change are significant aspects.

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Answer:

the equation is balanced because there are 8 atoms of carbon, 26 atoms of oxygen, and 20 atoms of hydrogen. on each side of the equation.

PLEASE MARK BRAINLIEST

The mass of one mole of pennies is 1.326 × 1024 grams.

To determine the mass of one mole of pennies, we need to find the number of pennies in one mole and then multiply that by the mass of one penny. A mole of a substance is defined as the number of atoms, molecules or ions present in the substance and is equal to Avogadro's number, which is 6.022 × 1023.

Since one penny weighs about 2.2 grams, we can calculate the mass of one mole of pennies as follows:1 mole of pennies = 6.022 × 1023 pennies The mass of one mole of pennies = Number of pennies in one mole × Mass of one penny= 6.022 × 1023 × 2.2 grams= 1.326 × 1024 grams Therefore, the mass of one mole of pennies is 1.326 × 1024 grams.

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Answer: It is a 2:3 ratio because Al has a +2 charge and S and O both have a -2 charge. It takes 2 Al to bring 3 SO3 to a neutral state.

Explanation:

Answer:

The remaining gas is a mixture of argon, neon, krypton, and xenon. Because these elements are chemically very unreactive, chemical means cannot be used to separate them.

Explanation:

Answer:

They're in Group 0 as they have full outer shells meaning they are chemically unreactive as they already have full outer shells meaning they don't want to lose or gain any electrons. Thus, they can't separate during the separation of gases in the air.

They must also possess a fixed crystalline structure (spatial arrangement of atoms and ions).

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The element may have multiple stable isotopes, and the isotopic composition may vary from sample to sample.

Isotopes are two or more atom types that have the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element, but differ in nucleon numbers (mass numbers) because they have varying quantities of neutrons in their nuclei. Each isotope of a specific element has virtually identical chemical properties, but they vary in terms of their atomic weights and other physical attributes. The total number of protons in the nucleus plus the total number of electrons in a neutral (non-ionized) atom make up an atom's atomic number.

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The resulting reaction products are an ionic salt (NaCl) and an oxysalt (Ca3(PO4)2.

When NaCl is in contact with water, it dissolves and the water molecules separate their ions, therefore it will be in the aqueous phase.

In contrast, Ca3(PO4)2 is not soluble in water, therefore the molecule will settle out of solution as solid crystals.

So the answer will be C. 3NaCL(aq)+Ca3(PO4)2

Answer:

A bee sting has a ph of 5, and is therefore an acid. Litmus paper goes red (or stays red) in acidic solutions.

Answer:

The Blue Litmus Paper should turn red

Explanation:

Bee venom has a pH of 5.5, which means it is mildly acidic which in turn should make the Litmus paper turn Red. Hope this helps!

Answer:

b) Aluminum sphere: 11.4J

Silver sphere: 44.3 J

Explanation:

a) Mass of aluminum sphere

= 2.70(196)

= 529.20g

= 0.5292kg

Mass of silver sphere

= 10.49(196)

= 2056.04g

= 2.05604 kg

b) Work done (Joules)

= force (Newton) ×distance moved in the direction of the force (in meters)

\( \boxed{W = F \times d} \)

To raise the sphere, the work done is against gravity.

For the formula for weight (or force of gravity), the mass needed is in kg, which we have already converted to in part (a).

Since they asked for the work done on each sphere, let's calculate the work done for the aluminium sphere first.

Aluminium sphere:

F= mg

F= 0.5292(9.8)

F= 5.18616N

W= Fd

Work done

= 5.18616(2.2)

= 11.4J (3 s.f.)

Silver sphere:

F= mg

F= 2.05604(9.8)

F= 20.149192N

W= Fd

Work done

= 20.149192(2.2)

= 44.3J (3 s.f.)

Answer:

4.65 g x 1 mol/4.0026 g/mol = 1.162 mol helium

Explanation:

Here are three equations representing the chemical reaction between a metal and an acid:

Zinc + 2HCl → ZnCl2 + H2

Iron + 2HNO3 → Fe(NO3)2 + H2O + NO

Magnesium + 2H2SO4 → MgSO4 + 2H2O + SO2

The three equations representing the reaction :

In this reaction, zinc (metal) reacts with hydrochloric acid to form zinc chloride and hydrogen gas.

In this reaction, iron (metal) reacts with nitric acid to form iron(II) nitrate, water, and nitric oxide.

In this reaction, magnesium (metal) reacts with sulfuric acid to form magnesium sulfate, water, and sulfur dioxide.

In each of these equations, the metal reacts with the acid to produce a salt, water, and sometimes additional products such as hydrogen gas (H2), nitrogen dioxide (NO2), nitrogen monoxide (NO), or sulfur dioxide (SO2), depending on the specific acid and reaction conditions.

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Saturated solution refer to a solution in which the dissolved solute is in equilibrium with the undissolved solute.

A saturated solution is a chemical solution that contain maximum amount of a solute which is dissolved in the solvent. The addition of anotheg solute will not dissolve in a saturated solution. The amount of solute that can be dissolved in a solvent to form a saturated solution depends on a variety of factors.

Therefore, Saturated solution refer to a solution in which the dissolved solute is in equilibrium with the undissolved solute

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The term that describes a solution in which the dissolved solute is in equilibrium with the undissolved solute is saturated solution.

A saturated solution is one in which there is so much solute that it would not dissolve if there was anymore.

When a saturated solution comes into contact with more solute, the extra solute does not dissolve or deposit.

Thus, the term that describes a solution in which the dissolved solute is in equilibrium with the undissolved solute is saturated solution.

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Answer:

Got morning the iodate for the

The initial rate of the reaction with respect to O3 is approximately 0.00313 M/s, based on the given information.

To determine the initial rate of the reaction with respect to O3, we need to examine the change in concentration of O3 over time.

Initial concentration of O3 (initial [O3]) = 0.05 M

Reaction completion time (t) = 16 seconds

To calculate the initial rate of the reaction with respect to O3, we can use the following formula:

Initial rate = Δ[O3] / Δt

However, since the reaction reaches completion in 16 seconds, we can assume that the change in concentration of O3 over this time period is equal to the initial concentration of O3.

Therefore, the initial rate of the reaction with respect to O3 is equal to the initial concentration of O3 divided by the reaction completion time:

Initial rate = initial [O3] / t

Substituting the given values:

Initial rate = 0.05 M / 16 s ≈ 0.00313 M/s

Therefore, the initial rate of the reaction with respect to O3 is approximately 0.00313 M/s.

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The reaction that is occurring in this question is:

H2 + I2 -> 2 HI

As we can see, the molar ratio for H2 and I2 is 1:1, one mole of H2 for each mole of I2, and the molar ratio between any reactant and HI is 1:2, which means the number of moles of product will be two times more than the number of moles of the reactants

We have:

3.0 moles of H2

2.0 moles of I2

1.0 moles of HI

According to the molar ratio, we should have the name number of moles of I2 and H2, which means that H2 is in excess and I2 is the limiting reactant with 2 moles

If we have 2 moles of I2, and the molar ratio of I2 and HI is 1:2, we should have 4 moles of HI being produced

Therefore the theoretical number of moles is 4.0 moles of HI from 2.0 moles of I2

Answer:

(a) pH=4.0

(b) pH=8.3

Explanation:

Hello there!

In this case, since the pH is understood as the potential of the hydrogen in an aqueous solution, and we can calculate it is as follows:

\(pH=-log([H^+])\)

We simply need to plug in the concentrations on each question as shown below:

(a)

\(pH=-log(1x10^{-4})\\\\pH=4\)

(b)

\(pH=-log(5x10^{-9})\\\\pH=8.3\)

Regards!

Answer:

No he will not have hard boiled eggs for breakfast

Explanation:

The temperature required to boil the eggs is about 100⁰C. Unfortunately, at the height of the base camp (5,300 meters), water boils at 82⁰C.

This implies that the egg will not become cooked as at the time when the water begins to boil.

Since the eggs can only become hard boiled at 100⁰C and the temperature at which water boils at 5300 meters is less than that(82⁰C), the eggs can not become hard boiled.

F-18 has a biological half-life of about 6 hours and a physical half-life of 1.83 hours, making its active half-life roughly 1.4 hours (7). Fluorine F 18 has a half-life is 109.7 minutes and decays by positron,(+) emission.

Positrons are released by this fluorine radioactive isotope. A radioactive version of glucose that's also easily absorbed by cancer cells as well as normal cells can be created using F-18. Nuclear imaging can be used to locate tumours, map brain activity, and identify other diseases.

A key source of positrons is the fluorine radioisotope fluorine-18 (18F). Its half-life was 109.771(20) minutes, and its mass is 18.0009380(6) u. 96% of the time, it decays via positron emission, and 4% by electron capture.

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The sugar aribinose is burned completely in oxygen in a bomb calorimeter. The enthalpy change per mole of arabinose combustion is approximately 2335.89 kJ/mol.

To calculate the enthalpy change (ΔH) for the combustion reaction of arabinose per mole, we can use the equation:

ΔH = q / n

Where:
- ΔH is the enthalpy change per mole
- q is the heat released or absorbed (in this case, the heat absorbed)
- n is the number of moles of arabinose burned

First, let's calculate the heat absorbed by the calorimeter and its contents (q). We can use the equation:

q = C * ΔT

Where:
- q is the heat absorbed
- C is the heat capacity of the calorimeter and its contents
- ΔT is the change in temperature

In this case, C = 15.8 kJ/°C, and

ΔT = 20.54 - 20.00

= 0.54 °C.

Plugging in these values, we get:

q = 15.8 kJ/°C * 0.54 °C

= 8.532 kJ

Next, we need to calculate the number of moles of arabinose burned. The molar mass of arabinose (C₅H₁₀O₅) is 150.13 g/mol. Given that we burned a 0.548 g sample, we can calculate the number of moles:

n = mass / molar mass

= 0.548 g / 150.13 g/mol

= 0.00365 mol

Now, we can calculate the enthalpy change per mole:

ΔH = q / n = 8.532 kJ / 0.00365 mol

= 2335.89 kJ/mol

Therefore, the enthalpy change per mole of arabinose combustion is approximately 2335.89 kJ/mol.

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The enthalpy change per mole of arabinose in the combustion reaction is 9.58 kJ/mol. This value was calculated using the equation q = mCΔT and considering the mass of arabinose (0.548 g), heat capacity of the calorimeter (15.8 kJ/°C), and change in temperature (0.54 °C).

To calculate the enthalpy change per mole of arabinose, we need to use the equation q = mCΔT, where q is the heat absorbed or released, m is the mass of the arabinose (0.548 g), C is the heat capacity of the calorimeter and its contents (15.8 kJ/°C), and ΔT is the change in temperature (20.54 - 20.00 = 0.54 °C).
First, we need to convert the mass of arabinose to moles using its molar mass. The molar mass of arabinose is 150.13 g/mol.
0.548 g / 150.13 g/mol = 0.00365 mol
Now, we can calculate the heat absorbed or released by the arabinose.
q = (0.00365 mol) × (15.8 kJ/°C) × (0.54 °C) = 0.0349 kJ
To find the enthalpy change per mole of arabinose, we divide the heat absorbed or released by the number of moles.
ΔH = (0.0349 kJ) / (0.00365 mol) = 9.58 kJ/mol
Therefore, the enthalpy change per mole of arabinose in the combustion reaction is 9.58 kJ/mol.
In summary, by using the equation q = mCΔT, we calculated the heat absorbed or released by the arabinose during combustion. Then, we divided this value by the number of moles to find the enthalpy change per mole of arabinose, which is 9.58 kJ/mol.

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Hydroxide ions are produced in solution by Arrhenius bases. There are no free hydrogen ions in water. Because bases in water form hydroxide ions, it will result in their production.

Ka=[H+][A−]/[HA] .The amount of the original acid that has been ionised in solution is represented by the acid ionisation. As a result, the numerical value of Ka represents the acid's strength. Stronger acids than weaker acids with relatively lower Ka values include weak acids with substantially higher Ka values.

When an acid is dissolved in water, hydrogen ions are produced; as a result, the solution's hydrogen ion concentration rises.

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pH is the hydrogen ion concentration and pOH is the hydroxide ion concentration in the solution. pH KOH is 12.73, pOH KOH is 2.24 and pH NaCl is 7.

pH is the negative log of the hydrogen ion concentration and pOH is the negative log of the hydroxide ion concentration.

The relation between the pH and pOH can be given as, \(\rm pOH = 14 - pH\)

The pH of KOH can be calculated by the formula,

\(\rm pH = \rm -log [H^{+}]\)

In the first case, the concentration of the KOH is \(1. 87 \times 10^{-13}\;\rm M\)

Substituting values in the equation:

\(\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 87 \times 10^{-13}\;\rm M ]\\\\&= 12.73\end{aligned}\)

Hence, the pH of KOH is 12.73.

pOH of KOH can be calculated by the formula,

\(\rm pOH = \rm -log [OH^{-}]\)

The hydroxide concentration of the KOH solution is \(5. 81 \times 10^{-3}\;\rm M\)

Substituting value in the equation:

\(\begin{aligned} \rm pOH &= \rm -log [OH^{-}]\\\\&= \rm -log [5. 81 \times 10^{-3}\;\rm M ]\\\\&= 2.24 \end{aligned}\)

Hence, the pOH of KOH is 2.24

The pH of NaCl can be calculated by the formula,

\(\rm pH = \rm -log [H^{+}]\)

In the third case, the concentration of the NaCl is \(1. 00\times 10^{-7}\;\rm M\)

Substituting values in the equation:

\(\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 00 \times 10^{-7}\;\rm M ]\\\\&= 7 \end{aligned}\)

Hence, the pH of KOH is 7.0.

Therefore, KOH is basic and NaCl is approximately neutral.

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Answer: 24.32 AMU

Explanation:

See attachment.