Prepare 800 mL of 2M sodium chloride. How many grams of NaCl needs to be dissolve in a 800 mL distilled water?

The number of solute (stock solution) needed are 15 mL solute and the number of solvents (water) is needed 10 ml. The correct option is a.

Molarity is the measure of the concentration of any solute per unit volume of the solution.

Given that the 25 mL of a 60 mg/mL solution

Dose in hand = 0.5 g / 5ml =

500 mg / 5ml = 100 mg/ml

D= 60 mg x 25 = 1500 mg

Molarity = n / V

1500 mg / 100 mg/ml = 15 ml solute

The number of solutes then minus by the total stock supply

15 - 5 ml = 10 ml solvent

Thus, the correct option is a. 15 mL solute; 10 mL solvent.

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The rate expression is k [BF₃]²[NH₃], overall order is 3, rate constant k is 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹.

The rate expression for this reaction can be written as:

Rate = k [BF₃]^m[NH₃]^n

The method of initial rates can be used to calculate the values of m and n. When we compare experiments 1 and 2, notice that halving the concentration of [NH3] reduces the initial rate of reaction. This suggests that the reaction is first order in terms of [NH3], implying that n = 1.

When comparing experiments 1 and 3, notice that increasing the concentration of [BF3] by a factor of 2.5 increases the initial rate of reaction by a factor of 9.39 (i.e., 2.13/0.227). This shows that the reaction is about second order in relation to [BF3], i.e., m 2.

Therefore, the rate expression for the reaction is:

Rate = k [BF₃]²[NH₃]

The overall order of the reaction is m + n = 3.

Using the data from experiment 4, substitute the values and solve for k:

Rate = k [BF₃]²[NH₃]

1.02 × 10-¹ = k (3.00 × 10⁻¹)² (1.00 x 10⁻¹)

k = 1.02 × 10-¹ / (3.00 × 10⁻¹)² (1.00 x 10⁻¹)

k = 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹

Therefore, the rate constant k is 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹.

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Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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Biotechnology is the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management, as in waste recycling: includes the use of bioreactors in manufacturing, microorganisms to degrade oil slicks or organic waste, genetically engineered bacteria to produce human hormones, and monoclonal antibodies to identify antigens.

Biotech offers the possibility of improving human health, the environment, and agriculture while creating more sustainable modes of production.

The respective concentrations of Fe3+ and Cl- are 0.6897 M and 2.069 M, respectively.

First we can use the following equation:

M1V1 = M2V2

where

We know that we have 0.500 mol of Fe3+ in a volume of 725 mL (or 0.725 L). To find the concentration of Fe3+, we can rearrange the equation as follows:

M1 = M2V2 / V1

M1 = (0.500 mol / 0.725 L) = 0.6897 M

Therefore, the concentration of Fe3+ is 0.6897 M.

Since FeCl3 dissociates in water to form one Fe3+ ion and three Cl- ions, the concentration of Cl- is three times the concentration of Fe3+. Therefore, the concentration of Cl- is:

(3 x 0.6897 M) = 2.069 M

Therefore, the respective concentrations of Fe3+ and Cl- are 0.6897 M and 2.069 M, respectively.

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If you accidentally add salt instead of sugar to a recipe, you can use vinegar to counteract the salty taste.

If you have added salt instead of sugar to a recipe, then you can try to remove the salt by adding a substance that will counteract its flavor. One such substance is vinegar, which is an acid and can help to neutralize the salty taste. Here are the steps to remove salt from a dish:

1. Remove as much of the salty liquid or sauce as possible.

2. Dilute the remaining sauce or liquid by adding more of the ingredients in the recipe, except for the salt

3. Taste the dish and add more sugar if needed.

4. If the dish is still too salty, add a little bit of vinegar.

5. Keep tasting the dish and adjusting the sugar and vinegar until it is no longer too salty.6. If the dish becomes too sweet, add more of the other ingredients to balance it out.

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Answer:

I think the answer is letter C

Explanation:

k

ca

mg

zn

fe

sn

pb

h

cu

hg

ag

pt

au

the answer is calcium or magnesium

because that metal's activity will be higher than al and

lower than Na. so that the metal will be ca or mg.

The new volume of the balloon after heating it to a temperature of 51 °C is approximately 2.39 L.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Given that:

Substituting the given values and solve for V₂:

\(V_1T_2 = V_2T_1\\\\V_2 = \frac{V_1T_2}{T_1} \\\\V_2 = \frac{2.2\ *\ 324.15}{298.15 }\\ \\V_2 = 2.39 \ L\)

Therefore, the final volume is 2.39 litres.

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Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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Answer:

the volume of the gas will decrease

Concave shape of Wave Rock is the physical evidence that supports the evolution of Earth due to deposition.

The concave shape of Wave Rock is nice physical evidence of deposition in the Earth's evolution. It is a 2.7-billion-year-old land structure that served as the foundation for the formation of the Australian continent.

A naturally occurring rock formation that resembles a tall, breaking ocean wave is called Wave Rock. The "wave" is roughly 110 m (360 ft) long and 15 m (49 ft) tall. It makes up the north side of the isolated hill known as "Hyden Rock."

Since Wave Rock is made of much tougher material from its surroundings, the weathering lowered the surrounding terrain while the bedrock remained to serve as a witness for the past.

The structure of Wave Rock was created by the weathering of the surrounding area, and this is exactly what proves the deposition part. Wave Rock was below the ground because of the deposition of the material around it over time.

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Complete Question

Which physical evidence supports the evolution of Earth due to deposition?

A) Red color of Thor's Hammer

B) Concave shape of Wave Rock

C) Streaks on the face of Wave Rock

D) Broader tip than base of Thor's Hammer

Answer:

6.67* 1011 Hz

Explanation:

a p e x

Answer:

Awnser above is correct

Explanation:

a. 6.67

The right response is C) A person commutes to work on a bicycle or by taking public transit. This is an illustration of a sustainable behaviour that people or families may adopt since it lessens their carbon footprint and promotes energy conservation.

People may decrease their dependency on vehicles, which are a significant source of greenhouse gas emissions, by adopting a bicycle or public transit. This promotes a healthier environment and lowers air pollution.

Additionally, users may save money on petrol and automobile maintenance by switching from driving to public transit. People may also lessen their reliance on oil, which is a limited resource, by using bicycles or public transit. This environmentally friendly method can assist to protect the environment.

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The density of 200 cm^3 of pure water is 200 g / 200 cm^3 = 1 g/cm^3, and  is the same as the density of 1 cm^3 of water.

b. A Corn syrup on top, water in middle, and olive oil on bottom because corn syrup has the highest density of 1.4 g/cm^3, followed by water with a density of 1 g/cm^3, and olive oil with a density of 0.85 g/cm^3.

So option A is correct.

Density is described as the substance's mass per unit of volume.

We were able to determine which substance will stay in its relative position using Archimedes' principle which states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.

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Answer:

1.674 x 10^-23 grams

Explanation:

Hydrogen-1 is called Protium

wikipedia

atomic mass of Protium is 1.00794 amu

sciencedirectcom

atomic mass of 10 Protiums is 10.0794 amu

10.0794 amu in grams is

1.6737236x10^-23 grams

The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.

The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.

The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.

The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.

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Glycolysis and photosynthesis are fundamental processes that are necessary for the survival of living organisms. They are similar in that they both involve the conversion of energy, but differ in the source of energy used, the location of the process, and the requirement for oxygen.

Glycolysis and photosynthesis are two necessary fundamental processes. Glycolysis is a metabolic pathway that occurs in the cytoplasm of cells. The glycolysis process is necessary because it produces ATP, which is the energy required for all cellular activities.

The energy is produced by breaking down glucose into two pyruvate molecules.Photosynthesis is the process by which green plants make their food. During photosynthesis, light energy is converted into chemical energy, which is stored in glucose molecules. This process is also necessary as it provides food and oxygen for most living organisms to survive.In terms of similarities, both glycolysis and photosynthesis are processes that involve the conversion of energy.

In glycolysis, glucose is converted into pyruvate and ATP, while in photosynthesis, light energy is converted into chemical energy. Both processes are also vital to the survival of living organisms.The primary difference between the two processes is the source of energy used. Glycolysis uses glucose as the primary energy source while photosynthesis uses light energy from the sun.

Glycolysis occurs in the cytoplasm of cells while photosynthesis takes place in the chloroplasts of plant cells. Glycolysis is an anaerobic process that does not require oxygen, while photosynthesis is an aerobic process that requires oxygen and releases it as a byproduct.

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The hydroxide ion concentration, [OH-], for a solution with a pH of 4.65 is approximately 3.55 x \(10^{-10}\)M.

What is concentration?

To calculate the hydroxide ion concentration, [OH-], from the given pH, we can use the following relationship:

pH + pOH = 14

where pOH is the negative logarithm of the hydroxide ion concentration:

pOH = -log[OH-]

Rearranging the first equation, we get:

pOH = 14 - pH

Substituting the given pH value of 4.65, we get:

pOH = 14 - 4.65 = 9.35

Finally, we can calculate the hydroxide ion concentration, [OH-], by taking the antilogarithm (inverse log) of the pOH value:

[OH-] = \(10^{(-pOH)}\) = \(10^{-9.35}\) = 3.55 x \(10^{-10}\) M

Therefore, the hydroxide ion concentration, [OH-], for a solution with a pH of 4.65 is approximately 3.55 x \(10^{-10}\) M.

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The theoretical yield of NH₃ produced under the given conditions is 11.75 g.

The balanced equation for the reaction between hydrogen (H₂) and nitrogen (N₂) to form ammonia (NH₃) is;

N₂ + 3H₂ → 2NH₃

To determine the theoretical yield of NH₃ produced from the given amounts of H₂ and N₂, we need to calculate the limiting reactant and then use stoichiometry to find the maximum amount of NH₃ which can be produced.

The molar masses of H₂, N₂, as well as NH₃ are;

H₂; 2.02 g/mol

N₂; 28.02 g/mol

NH₃; 17.03 g/mol

The number of the moles of each reactant will be calculated as;

moles of H₂ = mass of H₂ / molar mass of H₂ = 1.40 g / 2.02 g/mol = 0.693 mol

moles of N₂ = mass of N₂ / molar mass of N₂ = 9.66 g / 28.02 g/mol = 0.345 mol

To determine the limiting reactant, we need to compare the mole ratios of H₂ and N₂ in the balanced equation with the actual mole ratios of the reactants. The balanced equation shows that 1 mole of N₂ will reacts with 3 moles of H₂ to produce a 2 moles of NH₃. The actual mole ratio of N₂ to H₂ in the reaction mixture is;

moles of N₂ / moles of H₂ = 0.345 mol / 0.693 mol

= 0.498

This ratio is less than the required ratio of 1/3, which means that N₂ is the limiting reactant. This means that all the N₂ will be consumed in the reaction and the amount of NH₃ produced will depend on the amount of N₂ present.

Using the mole ratio from the balanced equation, we can calculate the theoretical yield of NH₃ that can be produced from the 0.345 mol of N₂;

moles of NH₃ = (0.345 mol N₂) × (2 mol NH3 / 1 mol N₂)

= 0.690 mol NH₃

The mass of this amount of NH₃ can be calculated as;

mass of NH₃ = moles of NH₃ × molar mass of NH₃ = 0.690 mol × 17.03 g/mol = 11.75 g

Therefore, the theoretical yield is 11.75 g.

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Answer:

i dont know what you are saying

Explanation:

????????????

Answer:

1.67

Explanation:

Mass÷mr=moles

3÷18=1.67

Answer:

NET equation: 2Br^- (aq) + Cr2+ (aq) → CrBr2 (aq)

The solubility signs for each compound are:

Barium bromide (BaBr2): (aq) - aqueous (soluble)

Chromium (II) sulfate (CrSO4): (aq) - aqueous (slightly soluble)

Barium sulfate (BaSO4): (s) - solid (insoluble)

Chromium (II) bromide (CrBr2): (aq) - aqueous (soluble)

Explanation:

Barium bromide and chromium (II) sulfate are both ionic compounds that can dissociate into their constituent ions in aqueous solutions. To write the net ionic equation for the reaction between barium bromide and chromium (II) sulfate, we first need to determine the state of the reactants and products (whether they are soluble or insoluble in water) using solubility rules.

Barium bromide (BaBr2) is soluble in water, while chromium (II) sulfate (CrSO4) is slightly soluble. When the two are mixed in water, a double displacement reaction takes place, producing barium sulfate (BaSO4) and chromium (II) bromide (CrBr2) as the products:

BaBr2 (aq) + CrSO4 (aq) → BaSO4 (s) + CrBr2 (aq)

To write the net ionic equation, we need to eliminate any spectator ions that do not participate in the reaction. In this case, the barium and sulfate ions are spectator ions, as they appear unchanged on both sides of the equation. The net ionic equation is therefore:

2Br^- (aq) + Cr2+ (aq) → CrBr2 (aq)

where Br^- and Cr2+ are the ions that actually participate in the reaction.

The solubility signs for each compound are:

Barium bromide (BaBr2): (aq) - aqueous (soluble)

Chromium (II) sulfate (CrSO4): (aq) - aqueous (slightly soluble)

Barium sulfate (BaSO4): (s) - solid (insoluble)

Chromium (II) bromide (CrBr2): (aq) - aqueous (soluble)

Answer:

increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object would make the oppositely charged objects attract each other more.

Iron released 2.495 joules of heat.

To calculate the amount of heat absorbed or released by 90.23g of iron, we need to use the specific heat of iron and the change in temperature.

Iron has a specific heat capacity of 0.45 J/g °C, which means that it takes 0.45 Joules of energy to raise the temperature of 1 gram of iron by 1 degree Celsius.

First, we need to convert the mass of iron from grams to kilograms.

Iron mass = 90.23 g = 0.09023 kg

Now we need to calculate the temperature change. The initial temperature of the iron is T = 86°C, but the final temperature is unknown. Assuming that the iron undergoes a process that neither loses nor gains heat through the environment, the following equation can be used.

heat absorbed = heat released

This means that the amount of heat absorbed by iron is equal to the amount of heat given off by the environment. So you can use the following formula:

Heat absorption = mass x specific heat capacity x temperature change

Since there is no heat loss or gain to the environment, we can assume that the temperature of the environment is constant at 25°C. So the temperature change is:

temperature change = final temperature - initial temperature

Temperature change = 25°C - 86°C

Temperature change = -61°C

Note that the temperature change is negative because iron loses heat.

Now you can insert the value.

Heat absorbed = 0.09023 kg × 0.45 J/g °C × (-61 °C)

heat absorbed = -2.495 J

Since the value is negative, this indicates that the iron lost heat to the environment and the environment gained heat.

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Evaporation causes the dew to vanish when the temperature of the atmosphere rises with the rising of the sun.

A kind of vaporization called evaporation takes place on the surface of a liquid as it transitions into the gas phase. When humidity impacts the rate of evaporation of water, for example, a high concentration of the evaporating material in the surrounding gas considerably slows down evaporation.

Similar to how perspiration evaporates from your body on a hot day to cool you down, dew evaporates as it cools the plant. This lessens heat exhaustion in extremely hot settings. Some species, particularly desert plants, are capable of directly absorbing water via their leaves.

Thus, Evaporation causes the dew to vanish when the temperature of the atmosphere rises with the rising of the sun.

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