In which type of bond are electrons completely transferred from one atom to another, forming ions?
- ionic - covalent - metallic
- hydrogen

At the equivalence point of the titration, the pH is approximately 12.88 in a 25.0 ml sample of 0.150 m nitrous acid.

At the equivalence point of the titration between nitrous acid (\(HNO_2\)) and sodium hydroxide (NaOH), the moles of \(HNO_2\) and NaOH are equal.

The reaction between \(HNO_2\) and NaOH produces sodium nitrite (\(NaNO_2\)) and water (H2O). \(NaNO_2\) undergoes hydrolysis in water, resulting in the formation of hydroxide ions (OH-). The hydroxide ions increase the pH of the solution.

Since the moles of \(HNO_2\) and NaOH are equal, the concentration of hydroxide ions (OH-) can be calculated by dividing the number of moles of NaOH by the total volume of the solution (50.0 mL or 0.050 L).

Moles of NaOH = Molarity × Volume = 0.150 M × 0.0250 L = 0.00375 mol

Concentration of OH- at the equivalence point = (0.00375 mol) / (0.050 L) = 0.075 M

To calculate the pH at the equivalence point, we can use the fact that pH + pOH = 14. Taking the negative logarithm of the hydroxide ion concentration:

pOH = -log10(0.075) ≈ 1.12

pH = 14 - pOH ≈ 14 - 1.12 ≈ 12.88

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To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

The statement "atoms have a small, dense nucleus" is true.  A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.

Therefore, the correct option is option C.

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Answer: C. 1000 Newton

Explanation:

Given that :

Weight of moon rover on earth = 6000 newton

Approximate of moon rover on moon will be?

Weight of an object (W) = mass(m) × acceleration due to gravity(g)

To get the mass of moon rover(m) :

m = weight / acceleration due to gravity

g on earth = 9.8m/s²

Hence,

mass of moon rover = 6000/ 9.8

= 612.244kg

Surface gravity on the moon is about 1.6m/s²

Hence ;

Weight of moon rover on the moon :

Mass of moon rover × 1.6m/s²

= 612.244 × 1.6m/s²

= 979.59 Newton

= 1000 Newton (nearest thousand)

The approximate weight of the Moon Rover on the Moon is 1000 N

The correct answer to the question is Option C. 1000 N

We'll begin by calculating the mass of the Moon Rover. This can be obtained as follow:

Weight (W) = 6000 N

Acceleration due to gravity (g) = 9.8 m/s²

W = m × g

6000 = m × 9.8

m = 6000 / 9.8

Acceleration due to gravity of the moon (g) = 1.67 m/s²

Mass (m) = 612.24 Kg

W = m × g

W = 612.24 × 1.67

Therefore, the approximate weight of the Moon Rover on the Moon is 1000 N

The correct answer to the question is Option C. 1000 N

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Answer:

a molecule.

Explanation:

The concentration in mass-volume percent of the solution is: 5.45 %

To solve this problem the formula and the procedure that we have to use is:

% m/v = m(solute)/v(solution) * 100

Where

Information about the problem:

Applying the concentration formula  we get:

% m/v = m(solute)/v(solution) * 100

% m/v = (13.9 g/255 ml) * 100

% m/v = 0.0545 *100

% m/v =5.45 %

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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The percent composition of nitrogen in sodium nitride is approximately 16.87%.

The percent composition of nitrogen in sodium nitride (Na₃N) can be calculated by determining the molar mass of nitrogen and the molar mass of the compound as a whole.

molar mass

molar mass of nitrogen = 14.01 grams

molar mass of sodium nitride = (3 * molar mass of Na) + (1 * molar mass of N)

molar mass of sodium nitride = (3 * 22.99 g/mol) + (1 * 14.01 g/mol)

molar mass of sodium nitride =  82.98 g/mol

percent composition of nitrogen

Percent composition of nitrogen = (molar mass of N / molar mass of  Na₃N) * 100

Percent composition of nitrogen = (14.01 g/mol / 82.98 g/mol) * 100

Percent composition of nitrogen = 16.87%

Therefore, the percent composition of nitrogen in sodium nitride is approximately 16.86%.

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"Polar" and "ionic" materials will most likely dissolve in water.

The two classes of materials that will dissolve in water are "polar" and "ionic" materials. Polar materials, such as sugar or alcohol, have an uneven distribution of charges, which allows them to interact with water molecules and dissolve. Ionic materials, such as table salt (sodium chloride), consist of positive and negative ions that are attracted to the positive and negative poles of water molecules, leading to their dissolution in water.

In both cases, the ability of a substance to dissolve in water depends on the interactions between the water molecules and the molecules or ions of the substance. Water's polarity and its ability to form hydrogen bonds make it an excellent solvent for many polar and ionic substances.

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Answer:

b

Explanation:

In an ecosystem, the  ozone depleting substance  is chlorofluorocarbon or the CFC's.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems.

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There are 6.022 × 10²³ atoms present in 1 mole of any element.

1 mole of any substance is equal to 6.022 × 10²³ atoms , molecules of ions present in it.

According to Avogadro’s law, "under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules." This law is valid for real gases at high temperature and  low pressure.

So 1 mole of any gas will contain 6.022 × 10²³ ions, atoms or molecules. 6.022 × 10²³, here is known as Avogadro's number.

This relation can be derived from the kinetic theory of gases for the assumption of a perfect or ideal gas.

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Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KMnO4, or 158.033949 grams.

Explanation:

I belive that is correct,hope it helps:)

Answer:

C

Explanation:

Noon is the peak amount of sun shining. Therefore the plant will be carrying out a lot of photosynthesis using the light. Cellular respiration happens regularly as well

At midday, what is happening in the leaf of a plant would be photosynthesis and cellular respiration. The correct option would, therefore, be C.

Photosynthesis has two reactions:

The light dependent reaction is rate determining step of photosynthesis. Hence, photosynthesis proceeds at normal rate during the day.

Cellular respiration, on the other hand, takes place with or without light.

Hence, at 12 pm, Noon, both photosynthesis and cellular respiration will be taking place simultaneously in the leaf of plants.

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a) The 98% confidence interval for the true proportion of e-cigarette smokers between 15-17 years of age is approximately 4.93% to 10.27%.

b) The 95% confidence interval for the true mean of times young people smoke e-cigarettes a week is approximately 7.45 hours to 8.55 hours.

c) The 98% confidence interval for the true mean of times young people smoke e-cigarettes a week, considering a known population standard deviation of 2.05 hours, is approximately 7.78 hours to 8.22 hours.

a) To construct the confidence interval for the true proportion of e-cigarette smokers, we can use the sample proportion, standard deviation, and the desired confidence level. With a sample proportion of 7.6% and a standard deviation of 2.7, we can calculate the standard error as the square root of (sample proportion * (1 - sample proportion) / sample size). Using the formula for a confidence interval, we find the margin of error by multiplying the standard error by the critical value corresponding to the desired confidence level (in this case, 98%). The margin of error is then added and subtracted from the sample proportion to obtain the lower and upper bounds of the confidence interval.

b) For constructing the confidence interval for the true mean of times young people smoke e-cigarettes a week, we use the sample mean, standard deviation, and the desired confidence level. With a sample mean of 8 hours and a standard deviation of 1.5 hours, we can calculate the standard error as the standard deviation divided by the square root of the sample size. Applying the formula for a confidence interval, the margin of error is obtained by multiplying the standard error by the critical value corresponding to the desired confidence level (95%). The margin of error is then added and subtracted from the sample mean to determine the lower and upper bounds of the confidence interval.

c) In this case, since the population standard deviation is known, we can use it instead of the sample standard deviation to construct the confidence interval. With a known population standard deviation of 2.05 hours, we can calculate the standard error using the population standard deviation divided by the square root of the sample size. Following the formula for a confidence interval, the margin of error is obtained by multiplying the standard error by the critical value corresponding to the desired confidence level (98%). The margin of error is added and subtracted from the sample mean to establish the lower and upper bounds of the confidence interval.

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Answer:

When you bake a cake, the ingredients go through a chemical change. A chemical change occurs when the molecules that compose two or more substances are rearranged to form a new substance! When you start baking, you have a mixture of ingredients. The flour, egg, sugar,

Explanation:

Answer:

3. 5. and i think thats it

Answer:

3. 5. and i know it is right

Explanation:

Answer:D

Explanation:

The metal will not react

The standard Gibbs free energy change (ΔG°) for the auto ionization of water is 79.0kJ/mol

For the autoionization of water at 25°C, where H2O(l) ⇌ H+(aq) + OH−(aq) and the equilibrium constant K_w is 1.0 × 10−14, we can find the standard Gibbs free energy change (ΔG°) using the following formula:
ΔG° = -RT ln(K_w)
where R is the universal gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25°C = 298.15 K), and K_w is the equilibrium constant.
Step 1: Convert the temperature from Celsius to Kelvin
T(K) = T(°C) + 273.15
T(K) = 25°C + 273.15 = 298.15 K
Step 2: Calculate ΔG° using the formula:
ΔG° = - (8.314 J/mol·K) × (298.15 K) × ln(1.0 × 10−14)
Step 3: Perform the calculation:
ΔG° = - (8.314 J/mol·K) × (298.15 K) × (-31.83)
ΔG° = 79.0 kJ/mol
Therefore, the standard Gibbs free energy change (ΔG°) for the autoionization of water at 25°C is approximately 79.0 kJ/mol.

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Diastereomers have different chemical properties because their arrangements are different.

Diastereomers are isomers that are not mirror images of each other. They are isomers with two or more stereocenters and differ from each other in some of their physical and chemical characteristics. They have different chemical properties due to their different arrangements.

How do Diastereomers differ from Enantiomers?

Enantiomers are molecules that mirror each other, whereas diastereomers are molecules that are not mirror images of each other. These two types of isomers differ only in their physical properties, such as melting and boiling points, optical rotation, and reactivity. They possess the same chemical properties, with identical reactivity with other molecules.

How are diastereomers formed?

Diastereomers are formed when there are two or more stereocenters; at least one but not all of the stereoisomers is not a mirror image of the others. Diastereomers have different chemical properties from each other because their configurations are different. Even though diastereomers have the same molecular formula, they may have different physical properties, such as solubility, boiling point, melting point, etc.

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Answer:

0.694 cents per second

Explanation:

25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second

Answer:

the arrow (single arrow) means that all the reactants are going to products.

Answer:

60.88%

Explanation:

The formula for cerium carbonate is Ce₂(CO₃)₃.

Let's assume we have 1 mol of cerium carbonate. The total mass would be equal to the molar mass of Ce₂(CO₃)₃, 460.25 g/mol.

Out of those 460.25 g, the mass corresponding to cerium would be:

Now we can calculate the percentage by mass of cerium:

Answer:

The pH scale is used to measure the acidity or basicity of a substance.

Explanation:

pH stands for potential hydrogen. It ranges from 0 to 14, 7 being neutral. The pH of water is 7 i.e. it is neither acidic nor basic. 0 to 7 shows acidic behavior while 7 to 14 shows basic behavior.

Experiment:

Dip the pH paper in the liquid and wait for ten seconds. The pH strip starts to discolor.

For a strong acid the strip will turn red.

For a weak acid the strip will become pale red.

To find the correct pH value we can compare it with the indicator scale present on the pH scale box.

The scale used to measure the basicity of a substance is called the pH scale.

The pH scale is a logarithmic scale that ranges from 0 to 14 and is used to determine the acidity or basicity of a solution. A pH value of 7 is considered neutral, values below 7 are acidic, and values above 7 are basic.

To differentiate a weak base from a strong one, you can perform the following experiments:

pH Measurement: Measure the pH of the solution containing the base using a pH meter or pH indicator paper. A strong base will have a higher pH value, typically around 12-14, indicating a highly basic solution. A weak base will have a lower pH value, closer to 7, indicating a less basic or slightly basic solution.

Conductivity Test: Dissolve a small amount of the base in water and measure its electrical conductivity using a conductivity meter. Strong bases are good electrolytes and will conduct electricity well, resulting in a high conductivity. Weak bases, on the other hand, are poor electrolytes and will exhibit lower conductivity.

Reaction with Acids: Add a few drops of a strong acid, such as hydrochloric acid (HCl), to a solution containing the base. Strong bases will rapidly and completely neutralize the acid, resulting in a significant increase in pH. Weak bases, however, will only partially neutralize the acid, leading to a smaller increase in pH.

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Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

Answer:

Explanation:

GIven that:

The activation energy = 250 kJ

k₁ = 0.380 /M

k₂ = ???

Initial temperature \(T_1 =\) 1001 K

Final temperature \(T_2 =\) 298 K

Applying the equation of Arrhenius theory.

\(In \dfrac{k_2}{k_1 }= \dfrac{Ea}{R}( \dfrac{1}{T_1 }- \dfrac{1}{T_2})\)

where ;

R gas constant = 8.314  J/K/mol

\(In \dfrac{k_2}{0.380 }= \dfrac{250 * 10^3}{8,314}( \dfrac{1}{1001 }- \dfrac{1}{298})\)

\(In \dfrac{k_2}{0.380 }= -70.8655\)

\(\dfrac{k_2}{0.380 }= e^{-70.8655}\)

\(\dfrac{k_2}{0.380 }= 1.67303256 \times 10^{-31}\)

\({k_2}= 1.67303256 \times 10^{-31} \times {0.380 }\)

\({k_2}= 6.3575 \times 10^{-32}\)  /M .sec

Half life:

At 1001 K.

\(t_{1/2} = \dfrac{In_2}{k_1}\)

\(t_{1/2} = \dfrac{0.693}{0.38}\)

\(t_{1/2} =\) 1.82368 secc

At 298 K:

\(t_{1/2} = \dfrac{0.693}{6.3575 \times 10^{-32}}\)

\(t_{1/2} =1.09 \times 10^{31} \ sec\)

Answer:

Ideal Gas Law?

Explanation:

PV = nRT

V is proportional to T thus at constant P it should increase with T

Answer:

The law that states that volume increases with temperature (at constant pressure) is known as Gay-Lussac's Law or the pressure-volume law. It states that the volume of a gas is directly proportional to its temperature, when the pressure is kept constant. This means that if the temperature of a gas is increased, its volume will also increase, and if the temperature is decreased, the volume will decrease. This law is a part of the ideal gas laws, which describe the behavior of gases under various conditions.

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The qualities that are maintained during all chemical reactions are as follows:

A. The identity of the atoms present in the reactants

B. The number of atoms present in the reactants

In chemical reactions, the law of conservation of mass states that the total amount of matter in a closed system remains constant. This means that certain qualities of the reactants must be maintained in order for this law to be upheld. The qualities that are maintained during all chemical reactions include:

A. The identity of the atoms present in the reactants: The atoms in the reactants are not destroyed or created during the reaction. They simply rearrange to form new compounds.

B. The number of atoms present in the reactants: The total number of atoms in the reactants must equal the total number of atoms in the products. This is because matter cannot be created or destroyed, only transformed from one form to another.

C. The arrangement of chemical bonds present in the reactants: The reactants are composed of chemical bonds that hold the atoms together. In a chemical reaction, the bonds are broken and new bonds are formed to create the products. However, the number of bonds present in the reactants must equal the number of bonds present in the products.

D. The number of reactant molecules: The number of reactant molecules must equal the number of product molecules, as the law of conservation of mass applies to individual molecules as well as to the total amount of matter in a closed system.

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The equations representing redox reactions are (a) 1, 2, and 3.

What is a redox reaction?

A redox reaction is a type of chemical reaction that involves the transfer of electrons between two species. In a redox reaction, one species will undergo oxidation (the loss of electrons), while another species will undergo reduction (the gain of electrons).

To identify which of the given equations represents redox reactions, we need to determine if there is a transfer of electrons between species in each of the equations.

Let's examine each equation in turn:

1. SnCl2 (s) + Cl2 (g) → SnCl4 (1)

In this equation, the oxidation state of Sn changes from +2 to +4, while the oxidation state of Cl changes from 0 to -1. Therefore, this equation represents a redox reaction.

2. Ca (s) + 2 H2O (s) → Ca(OH)2 (aq) + H2 (g)

In this equation, there is no change in the oxidation state for any of the species involved.

Therefore, this equation does not represent a redox reaction.

3. 2 H2O2 (I) → 2 H2O (l) + O2 (g)

In this equation, the oxidation state of O changes from -1 to 0.

Therefore, this equation represents a redox reaction.
O is both oxidized and reduced, as it goes from -1 in H2O2 to -2 in H2O and 0 in O2.

So the correct answer is (a) 1, 2, and 3.

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