A rock is placed in 10-mL of water causing the water level to rise
to 25-mL. The same rock has a mass of 7 grams. What is the density
of the rock?

Answer:

0.9grams

Explanation:

IF based on stoichiometry HNO3 to H2O is 6:2

Use 9 grams to find the moles of HNO3

9 grams/63g/mol=0.143 moles of HNO3

HNO3:H2O

6:2

0.143*2/6=0.048

H2O moles is 0.048moles

Mass of water =0.048moles*18g/mol=0.864g

To the nearest tenth=0.9grams.

Answer:

All waves of the electromagnetic spectrum have a speed of 3 × 10⁸ ms⁻¹

1M HCl solution is weaker

Explanation:

the option correct is letter B

The volume that will this gas have at 1.00 atmosphere pressure is 254.6. The volume is 254.6.

Boyle's law says that the volume of a gas at constant temperature varies with varying pressure.

The formula is

P1 V1 = P2 v2

P1 = 645

P2= 1.00 = 760 mmhg

V1 = 300 ML

V2 =?

Putting the value in the equation

645 x 300 = 760 x V2 =

V2 = 254.6

Thus, the volume is 254.6.

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Answer:is a trace metal of severe toxicity. Its health concerns via consumption of contaminated vegetables have often been overlooked or underestimated

Explanation: Read it carefully and it explains

The balanced chemical equation for the reaction between nitric acid (HNO3) and calcium hydroxide (Ca(OH)2) is:

\(2 HNO_{3} + Ca(OH)_{2} → Ca(NO_{3} )_{2} + 2 H_{2} O\)

According to the equation, 1 mole of calcium hydroxide and 2 moles of nitric acid combine to form 1 mole of calcium nitrate. With the use of this knowledge, we can calculate how much calcium nitrate can be made from the specified quantity of calcium hydroxide.

First, we need to convert the mass of calcium hydroxide to moles:

\(7.65 g Ca(OH)_{2} × (1 mol Ca(OH)_{2} / 74.093 g Ca(OH)_{2} ) = 0.1033 mol Ca(OH)_{2}\)

Since the reaction proceeds with a 67.0% yield, we can calculate the actual amount of calcium nitrate produced:

\(0.1033 mol Ca(OH)_{2} × (2 mol HNO_{3} / 1 mol Ca(OH)x_{2} ) × (1 mol Ca(NO_{3} )2 / 2 mol HNO_{3} ) × 0.67 = 0.0347 mol Ca(NO_{3} )_{2}\)

Finally, we can convert the moles of calcium nitrate to grams:

\(0.0347 mol Ca(NO_{3} )_{2} × 164.088 g Ca(NO_{3} )_{2} /mol = 5.69 g Ca(NO_{3} )_{2}\)

Therefore, the mass of calcium nitrate produced is 5.69 grams.

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The percent abundance of post-1982 pennies in the sample is 60% as per the given data.

Data sampling is a statistical analysis technique that uses a representative subset of data points to identify patterns and trends in the larger data set under consideration.

To find the percent abundance of post-1982 pennies in the sample data, we need to determine the total number of pennies and the number of post-1982 pennies.

The total number of pennies is:

8 + 12 = 20

To find the number of post-1982 pennies, we need to know the total mass of the pennies. We can use the average mass of the pre-1982 and post-1982 pennies to estimate the number of post-1982 pennies.

The total mass of the pre-1982 pennies is:

8 x 3.1 g = 24.8 g

The total mass of the post-1982 pennies is:

12 x 2.5 g = 30 g

The total mass of all the pennies is:

24.8 g + 30 g = 54.8 g

We can estimate the number of post-1982 pennies by dividing the total mass of the post-1982 pennies by the average mass of a post-1982 penny:

30 g / 2.5 g = 12

So there are 12 post-1982 pennies in the sample.

To find the percent abundance of post-1982 pennies, we can use the following formula:

Percent abundance = (number of post-1982 pennies / total number of pennies) x 100%

Percent abundance = (12 / 20) x 100% = 60%

Therefore, the percent abundance of post-1982 pennies in the sample is 60%.

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Answer:

d. all statements are correct

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.24moles of propane gas would be present in 11 grams of the gas at standard conditions.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole of substance =given mass of substance ÷ molar mass of substance

Molar mass of 1 mole of propane gas= 44.0956 g/mol

Given mass of propane gas=11 grams

Substituting all the given values in the above equation, we get

mole of substance =11 grams ÷44.0956 g/mol

mole of substance =0.24moles

Therefore, 0.24moles of propane gas would be present in 11 grams

of the gas at standard conditions.

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Nonmetal oxides form acid solutions. SO2, Cl2O, and N2O5 are acid solutions.

A chemical that offers off hydrogen ions in water and paperwork salts through combining with positive metals. Acids have a sour flavor and turn positive dyes purple. a few acids made by using the body, such as gastric acid, can assist organs work the way they must. An example of an acid is hydrochloric acid.

An acidic solution has a high attention of hydrogen ions, H +start superscript, plus, stop superscript, greater than that of pure water. An acidic solution is a liquid combination that happens when hydrogen ions are launched while mixed with water. This definition is known as the Brønsted-Lowry theory: acids provide hydrogen protons, at the same time as bases "accept" hydrogen protons. some answers are more acidic than others.

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The ∆godiss for acetic acid and monochloroacetic acid is determined by both the enthalpy and entropy contribution.

The enthalpy (∆H) contribution to ∆godiss is due to the energy absorbed or released during the breaking or forming of bonds between the molecules. The entropy (∆S) contribution is due to the degree of randomness or disorder in the system.

For acetic acid, the enthalpy contribution to ∆godiss is negative due to the release of energy during the formation of the hydrogen bond between the carboxyl group and the hydroxyl group. The entropy contribution is also negative due to the decrease in the degree of randomness when the molecules come together to form a solid.

For monochloroacetic acid, the enthalpy contribution is also negative due to the formation of the hydrogen bond and the dipole-dipole interaction between the chlorine atom and the carbonyl group. However, the entropy contribution

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The rate law for the given reaction, representing an elementary step, will be determined by the concentration of the reactants involved.

The rate law for a chemical reaction describes the relationship between the rate of the reaction and the concentrations of the reactants. In the case of an elementary step, which represents a single molecular event, the rate law can be directly derived from the balanced equation for that step.

To write the rate law, we need to identify the reactants involved in the elementary step and determine their respective powers (exponents) based on their concentrations. The rate law is typically written in the form:

Rate = \(k[A]^m[B]^n...\)

Here, [A], [B], and so on represent the concentrations of the reactants, and m, n, and other exponents are determined experimentally.

To obtain the rate law without including the states of matter, we focus solely on the reactant concentrations. The rate constant (k) is determined by experimental measurements and represents the specific rate of the reaction.

It's important to note that the rate law may differ for different elementary steps within a complex reaction. By determining the rate law, we can gain insights into the reaction mechanism and understand how changes in reactant concentrations affect the reaction rate.

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The rate of change of the concentration of Na₂C₂O4 is -0.0551 M/s.

To determine the rate of change of the concentration of sodium oxalate (Na₂C₂O4), we can use the rate equation:

Rate = (Δ[Na₂C₂O4]) / (Δt)

where Δ[Na₂C₂O4] represents the change in concentration of Na₂C₂O4 and Δt represents the change in time.

In this case, the initial concentration of Na₂C₂O4 is 1.34 M, and after 19.3 seconds, the concentration is 0.276 M.

Substituting the values into the rate equation, we have:

Rate = (0.276 M - 1.34 M) / (19.3 s - 0 s)

Rate = (-1.064 M) / (19.3 s)

Rate = -0.0551 M/s

Therefore, the rate of change of the concentration of Na₂C₂O4 is -0.0551 M/s.

The negative sign indicates that the concentration of Na₂C₂O4 is decreasing over time, as the reactant is being consumed in the reaction.

It's important to note that the rate of a reaction is influenced by various factors, such as the reaction mechanism, temperature, and presence of catalysts. The rate can be determined experimentally by measuring the change in concentration of a reactant or product over a specific time interval.

The given information allows us to calculate the rate of change for the specific reaction involving Na₂C₂O4. However, without additional information about the reaction, it is not possible to determine the exact nature or stoichiometry of the reaction, as well as any other reactants or products involved.

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12 moles O2 is a possible way to describe the elemental oxygen component in the reaction.

Define elemental oxygen form?

At normal temperatures and pressures, elemental oxygen is present as a gas, most frequently in the form of O2. This crucial ingredient, which is a crucial part of cellular respiration, is required for life on this planet.

This oxidation-reduction (redox) reaction is taking place:

8 S - 48 e- → 8 S (oxidation)

24 O + 48 e- → 24 O- (reduction)

O2 is an oxidizing agent, whereas S8 is a reducing agent.

Because each substance contains a huge number of atoms and molecules, we use the mole (mol) to express the amount of substances in chemistry. For the researcher who discovered how many atoms there are in 12 grams of carbon, the value provided, 6.022 x 1023 is known as Avogadro's number.

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Answer:

a) 0.06 mol K₂(CO₃) and 0.07 mol Al(NO₃)₃

b) The limiting reactant is K₂CO₃

c) 0.03 moles of Al₂(CO₃)₃

Explanation:

The balanced reaction between K₂CO₃ and Al(NO₃)₃ is the following:

3 K₂CO₃ + 2 Al(NO₃)₃ → Al₂(CO₃)₃ + 6 KNO₃

(a) We can calculate the moles for each reactant as the product of the molarity (M) and the volume (V) in liters.

K₂(CO₃): M = 2.4 mol/L , V = 25 mL x 1 L/1000 mL = 0.025 L

⇒ moles K₂(CO₃) = M x V = 2.4 mol/L x 0.025 L = 0.06 mol K₂(CO₃)

Al(NO₃)₃: M = 2.0 mol/L , V = 35 mL x 1 L/1000 mL = 0.035 L

⇒ moles Al(NO₃)₃ = M x V = 2.0 mol/L x 0.035 L = 0.07 mol Al(NO₃)₃

(b) According to the balanced equation, the stoichiometric ratio is 3 moles K₂CO₃/2 moles Al(NO₃)₃. We have 0.07 moles of Al(NO₃)₃, so we multiply the moles of Al(NO₃)₃ by the stiochiometric ratio to calculate how many moles of K₂CO₃ are needed:

0.07 mol Al(NO₃)₃ x 3 mol K₂CO₃/2 mol Al(NO₃)₃ = 0.105 moles of K₂CO₃

We need 0.105 moles of K₂CO₃ but we have only 0.06 moles of K₂CO₃. Therefore, the limiting reactant is K₂CO₃.

(c) We use the limiting reactant to calculate how many moles of product (Al₂(CO₃)₃) are formed. According to the equation, 2 moles of K₂CO₃ produce 1 mol of Al₂(CO₃)₃, thus the stoichiometric ratio is 1 mol Al₂(CO₃)₃/2 moles K₂CO₃. We have 0.06 moles of K₂CO₃, so the number of moles of Al₂(CO₃)₃ will be:

0.06 moles K₂CO₃ x 1 mol Al₂(CO₃)₃/2 moles K₂CO₃ = 0.03 moles of Al₂(CO₃)₃

Only 1% of the wavelengths of visible light are absorbed by photosynthetic pigments. Photosynthesis is the process by which plants convert sunlight into usable chemical energy in the form of glucose.

However, not all wavelengths of light are equally effective at driving photosynthesis. In fact, plants are only able to use a narrow range of wavelengths that fall within the visible spectrum (400-700 nm). This is because the pigments in chloroplasts have evolved to absorb light within this range, while reflecting or transmitting light outside of it. Furthermore, the efficiency with which plants are able to convert absorbed light energy into chemical energy is relatively low. This is due to a number of factors, including losses of energy through heat dissipation, photorespiration, and inefficiencies in the carbon fixation process.

As a result, only a small fraction of the total solar radiation that strikes a plant is ultimately converted into usable chemical energy. While the exact percentage may vary depending on a variety of factors (e.g. plant species, environmental conditions), it is generally estimated to be around 1%. In contrast, a significant portion of the solar radiation that strikes a plant is either reflected or absorbed as heat energy. This is because most plant surfaces (e.g. leaves, stems) have a high albedo, or reflectivity, which causes much of the incident radiation to bounce back into the environment. Additionally, some solar energy is absorbed by non-photosynthetic tissues such as the plant's woody stem or soil. In summary, the low conversion efficiency of photosynthesis and the limited range of wavelengths that can be absorbed by chloroplasts are the main reasons why only a small fraction of the solar radiation that strikes a plant is converted into usable chemical energy.

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A balanced equation obeys the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be always equal.

An equation in which the number of atoms of each element in the chemical reaction and the total charge are found to be the same for both the reactants and products. The mass of the reactants is equal to the mass of products.

The following steps are used to balance the given equation.

Thus the balanced equation obtained is:

Mg (NO₃)₂ + 2HCl → 2HNO₃ + MgCl₂

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The storage location of bile acids is the gall bladder.

Bile acids are made from cholesterol in the liver. Cholic acid  and chenodeoxycholic acid are the major bile acids.

These acids are very crucial for the digestion of dietary fats and fat-soluble vitamins(A, D, E, and K).

The bile that is secreted by the liver passes through the hepatic ducts and is stored and concentrated in a thin muscular sac called the gall bladder.  The bile then reaches the small intestine  where it acts upon the food and helps in its digestion.

Therefore, the instructor determines that the teaching was successful when the students identify the gall bladder as the storage location of bile acids.

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The value of the coefficient of determination is 0.49.

The coefficient of determination, also known as R-squared (R²), measures the proportion of the total variation in the dependent variable (energy content) that can be explained by the independent variable (protein content). It provides a measure of how well the regression model fits the data.

The coefficient of determination is calculated by squaring the correlation coefficient (r), which represents the strength and direction of the linear relationship between the two variables.

In this case, the given information provides the correlation coefficient (r = 0.7), which indicates a moderate positive correlation between protein content and energy content.

To find the coefficient of determination, we square the correlation coefficient:

R² = r² = (0.7)² = 0.49

Therefore, the value of the coefficient of determination is 0.49.

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Answer:

I think it's Nuclear

The given statement, "The electrolyte in the NiMH battery poses an extreme risk to rescue personnel" is false because the electrolyte in the NiMH battery does not pose an extreme risk to rescue personnel.

NiMH stands for nickel-metal hydride battery. It is a type of rechargeable battery that is widely used for various portable devices such as digital cameras, cell phones, and laptops. NiMH batteries are similar to nickel-cadmium (NiCad) batteries in terms of their characteristics, but they have a higher energy density and are less toxic.

The electrolyte in NiMH batteries is generally considered less hazardous than the electrolyte in lead-acid and lithium-ion batteries. It is usually an aqueous solution of potassium hydroxide (KOH) or sodium hydroxide (NaOH) that is sealed inside the battery. While KOH and NaOH can be corrosive and cause skin irritation, they are not classified as hazardous materials. However, it is still recommended to handle NiMH batteries with care and avoid damaging them. In case of a battery leak, the electrolyte may cause skin irritation or damage to electronic devices.

Therefore, it is advisable to wear gloves and protective eyewear when handling NiMH batteries or any other type of battery.

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Environmental groups may have supported cap-and-trade programs for SO2 emissions but not for NOx and heavy metals due to differences in their environmental impacts, technological feasibility, and the effectiveness of alternative regulatory approaches.

Environmental groups may have supported cap-and-trade programs for SO2 emissions due to the significant environmental and health impacts associated with SO2, such as the formation of acid rain and respiratory issues. Cap-and-trade programs provide a market-based approach to reducing emissions by setting a cap on total emissions and allowing companies to trade emission allowances. This approach incentivizes emission reductions and can effectively reduce SO2 levels.

On the other hand, cap-and-trade programs may not be as suitable for NOx and heavy metals due to several reasons. NOx emissions contribute to air pollution and can lead to smog formation and respiratory problems. However, reducing NOx emissions typically requires more complex and diverse control technologies, such as selective catalytic reduction (SCR) systems, which may not lend themselves well to the tradable permit system.

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Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Answer:

b atoms

Explanation:

everything is made up of atoms

Answer :

An electron transport chain (ETC) is a series of proteins and other molecules embedded in a membrane, which transfer electrons from one molecule to the next. The ETC plays a key role in cellular respiration, photosynthesis, and other metabolic processes that involve the transfer of energy in living cells.

During the light reactions of photosynthesis, the ETC is located in the thylakoid membrane of the chloroplast. Its role is to transport electrons and protons from water to NADP+ (nicotinamide adenine dinucleotide phosphate) to form NADPH, which is a key energy carrier in photosynthesis.

In summary, the electron transport chain is a crucial component of the light reactions of photosynthesis, where it helps to generate energy-rich molecules (NADPH and ATP) that are used in the next stage of photosynthesis, the Calvin cycle.

Answer:

they are only efficient in certain areas

Explanation:

Wind turbine are efficient only in certain areas it is a problem with using wind turbines to produce energy.

Wind turbine convert the wind energy into the electricity. It is a power generating device that converts the kinetic energy in to electrical energy.

Now lets check all option one by one:

Option (A): Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

So, it is correct option.

Option (B): Wind turbines occupy a lot of space to work.

So, it is incorrect option.

Option (C): Wind turbines produce a large amount of energy is not a problem.

So, it is incorrect option.

Option (D): Wind turbines does not create a pollution or it does not pollute the air or water.

So, it is incorrect option.

Thus, we can say that Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

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The correct answer is c. Exothermic and increases entropy. When a fuel burns in a calorimeter, it releases heat to the surroundings, indicating an exothermic process.

At the same time, the fuel is being broken down into smaller molecules, which increases the disorder or randomness of the system, leading to an increase in entropy. The second law of thermodynamics states that all spontaneous processes tend to increase the entropy of the universe. Therefore, the burning of a fuel in a calorimeter is an example of a spontaneous process that increases entropy. Answering in 200 words without error, it is important to understand the relationship between enthalpy, entropy, and spontaneity in chemical reactions. Exothermic reactions release heat and have a negative change in enthalpy, while endothermic reactions absorb heat and have a positive change in enthalpy. Entropy is a measure of the disorder or randomness of a system, and spontaneous processes tend to increase the entropy of the universe. Therefore, exothermic reactions tend to be spontaneous if they also increase the entropy of the system. In contrast, endothermic reactions tend to be non-spontaneous unless they also increase the entropy of the system. The burning of a fuel in a calorimeter is an example of an exothermic process that increases entropy and is therefore spontaneous.

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Answer:

c i think

Explanation:

Answer:

here is the answer. Feel free to ask for more chem help <3