A 100.-mL sample of water is taken from the Pacific Ocean, and the water is allowed to evaporate. The salts that remain (mostly NaCl) have a mass of 3.85 g. Calculate the original concentration of NaCl, in g per liter, in the water sample.

Answer:

Number of atoms of elements are same on left and right side of balance equation.

Explanation:

Every chemical reaction must follow the law of conservation of mass. According to which mass can neither be created nor destroy but it change from one to another form. It means mass remain conserved. That is why we need to balance the chemical equation because mass remain same on both side of equation. Consider the example,

Chemical equation:

N₂ + H₂    →   NH₃

We can see that nitrogen and hydrogen react with each other and from ammonia. We need to balance the equation to have equal amount on both side.

Balance chemical  equation:

N₂ + 3H₂    →   2NH₃

It means mass remain same but change from one to another form.

A balanced equation is one that is having a chemical reaction where the numbers of atoms. Here the number of elements in each reaction and the total charges are the same. This includes both the reactant and the product.

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Answer:

4.8*10^6

Explanation:

Simply count the number of decimal places moved to the left until you get 1 digit IN front of the decimal

The answer responses to  the structures shown in the diagram are:

A. chromosomes

C. They would be the same.

B. They are in pairs because each one comes from a different parent.

The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.

The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.

Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.

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Identify the structures shown.

A. chromosomes

B. mitochondria

C. nuclei

D. vacuoles

C

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Explain why the structures are in pairs.

A. They aren't in pairs.

B. They are in pairs because each one comes from a different parent.

C. This cell is making a copy of itself.

D. The cell always has 2 copies in case 1 is damaged.

The normal boiling point of the unknown liquid is 57.4°C.

The normal boiling point occurs when the vapor pressure of the liquid is equal to the atmospheric pressure. At normal boiling point, the temperature of the liquid is called the boiling point.

Using the Clausius-Clapeyron equation:

ln(P₂/P₁) = -(ΔHvap/R) * (1/T₂ - 1/T₁)

where P₁ is the vapor pressure at the given temperature T₁, P₂ is the vapor pressure at the boiling point temperature T₂, ΔHvap is the heat of vaporization, R is the gas constant.

At -170°C, the vapor pressure of the liquid is given as P₁ = 117 torr. At normal boiling point, the vapor pressure of the liquid is P₂ = 760 torr.

Converting all units to SI units, we have:

P₁ = 15.47 Pa

P₂ = 101325 Pa

ΔHvap = 5480 J/mol

R = 8.314 J/(mol*K)

Plugging in the values, we get:

㏑(101325/15.47) = -(5480/8.314) * (1/T₂ - 1/103.15)

Solving for T₂, the boiling point is found to be:

T₂ = 57.4°C

As a result, the unknown liquid's usual boiling point is 57.4°C.

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The equilibrium constant for the reaction is 0.0052.

Here are the steps to calculate the equilibrium constant for the reaction:

Write the equilibrium constant expression. The equilibrium constant expression for the reaction is:

K = \([SO3]^2 / [SO2]^2 * [O2]\)

Calculate the equilibrium concentrations of the reactants and products. The equilibrium concentration of oxygen is given as 0.25 mol.dm^3.

One can compute the equilibrium concentration of sulfur dioxide by applying the subsequent formula:

.

\([SO2] = (10 mol - 2 * 0.25 mol) / 2 dm^3 = 4.5 mol.dm^3\)

The equilibrium concentration of sulfur trioxide can be calculated using the following equation:

\([SO3] = (2 * 0.25 mol) / 2 dm^3 = 0.5 mol.dm^3\)

Substitute the equilibrium concentrations into the equilibrium constant expression and solve for K.

K = \((0.5 mol.dm^3)^2 / (4.5 mol.dm^3)^2 * (0.25 mol.dm^3)= 0.0052\)

Therefore, the equilibrium constant for the reaction is 0.0052.

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The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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a. The rate law for this reaction is: Rate = k[Cl] [H₂]. This means that the rate of the reaction is directly proportional to the concentrations of both Cl and H₂ molecules.

Rate law is an equation that describes the rate of a chemical reaction as a function of the concentrations of reactants. The rate law allows us to describe how the rate of a reaction changes when the concentrations of reactants are changed. It is derived from the rate equation, which is a mathematical expression that can be used to calculate the rate of a reaction from the concentrations of the reactants and the rate constant.

b. The rate law for this reaction is: Rate = k[O] [Os]. This means that the rate of the reaction is directly proportional to the concentrations of both O and Os molecules.
c. The rate law for this reaction is: Rate = k[NO₂]₂. This means that the rate of the reaction is directly proportional to the square of the concentration of NO₂ molecules.

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Complete Question:

Answer:i believe you are to decompose the formula (i think)

Answer:

5.992e+8

Explanation:

since one year = 3.154e+7

we'll just multiply that by 19

Answer: 5.996e+8

Explanation:

The enthalpy change of the reaction C(diamond) → C(graphite) is -2.9 kJ.

The given information is ΔHrxn for the reaction C(diamond) → C(graphite) can be calculated with the given equations:Equations:  C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ  2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ  C(graphite) + O2(g) → CO2(g) ΔH = −393.5 kJ  2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJThe required reaction can be obtained by adding the equations (1) and (4), as follows:C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)Addition of the two equations (1) and (4) results in a reaction whose products are C(graphite) and CO2.

To get the final equation that involves only the required reactants and products, the equation (2) should be added, which consumes CO2 and produces O2, as shown below:C(diamond) + O2(g) → CO2(g)  ΔH = −395.4 kJ [eq. (1)]  2 CO(g) → C(graphite) + CO2(g)  ΔH = −172.5 kJ [eq. (4)]  2 CO2(g) → 2 CO(g) + O2(g)  ΔH = 566.0 kJ [eq. (2)]  C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)  ΔHrxn=ΣΔHf(products)−ΣΔHf(reactants)  ΔHrxn=[(3 mol CO2)(-393.5 kJ/mol) + (1 mol C(graphite))(0 kJ/mol)] − [(1 mol C(diamond))(0 kJ/mol) + (1 mol O2)(0 kJ/mol) + (2 mol CO(g))(−172.5 kJ/mol)] − [(2 mol CO2)(566.0 kJ/mol)]  ΔHrxn=−2.9 kJ.

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Answer:

21121.58 grams

Explanation:

Given, 9.96 times 10 to the power of 26 atoms of tellurium

Convert atoms into moles of tellurium,

As we know, 1 mol= 6.02 *10 to the power of 23 atoms

Hence, 9.96 *10 to the power of 26/ 6.02 *10 to the power of 23= 1654 moles of tellurium

Now, mass= molar mass*moles

As we know, tellurium has a molar mass of 127.6000 g/mol

Mass= 1654 *1277 g/mol

       = 21121.58

Answer:

Each of these organelles performs a specific function critical to the cell's survival. For example, biochemical reactions in a cell's mitochondria transfer energy from fatty acids and pyruvate molecules into an energy-rich molecule called adenosine triphosphate (ATP).

Explanation:

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Answer: you can't really balance it doesn't make anything

Explanation:

Answer:

-trees

-solar energy

-hydroelectricity

-wind energy

sorry I can only think or 4 atm

Answer:

C. Protect them from predators because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment.

Explanation:

They build layers to protect themselves from predators. Plus, I've seen this question and got it right.

Water molecules did not have a slight negative charge on one end and a slight positive charge on another, the loss of polarity would have profound effects on various biological, chemical, and physical processes. The unique properties of water that are vital for life as we know it would be significantly altered, potentially rendering many biological systems nonfunctional and disrupting the stability of ecosystems.

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The molar mass of MgCrO4 is approximately 140.30 g/mol.

To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.

The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).

The atomic masses of the elements can be found on the periodic table:

Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.

Chromium (Cr) has an atomic mass of around 51.99 g/mol.

Oxygen (O) has an atomic mass of about 16.00 g/mol.

Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:

Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)

Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)

Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol

Molar mass ≈ 140.30 g/mol

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Answer:

c

Explanation:

Explanation:

Mole ratio of Zn to HCl = 1 : 2.

If we use all 2.0mol of Zn, we would need 2.0 * 2 = 4.0mol of HCl. However we only have 3.0mol of HCl.

Therefore HCl is limiting.

1)The earth is made up of three different layers: the crust, the mantle and the core.

2) I think an earthquake is when the tectonic plates form together and progress movement which cause floor shakiness and everything falls.

3) Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.

4) Earth's crust is divided into two types: oceanic crust and continental crust.

5)Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.

6)Indirect observation involves the analysis of textual material generated either indirectly from transcriptions of audio recordings of verbal behavior in natural settings or directly from narratives.

7)The mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” , the strange region where the mantle meets the outer core.

8)The outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to the inner core. Sulfur and oxygen could be present in the outer core.

Answer:

Explanation:

Here, we want to get the number of calories Q of heat needed

Mathematically:

Substituting the values, we have it that:

If 60 grams of the substance are added to 100 g of water, the solution can be categorized as supersaturated.

The graph shows the number of grams that can be dissolved in 100 grams of water at different temperatures. In general, solubility increases with temperature.

According to the graph, at a temperature of 30°C, it is possible to dissolve a total of 48 to 49 grams of \(KNO_{3}\). This information implies that if we add 60 grams at this temperature not all the substance would be dissolved, and therefore the solution would be supersaturated.

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The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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The mass of 12 L of carbon monoxide gas at STP is 32.16 g.

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is highly toxic to humans and animals. It is a product of the incomplete combustion of carbon-based fuels, such as natural gas, coal, wood, and gasoline. Carbon monoxide poisoning occurs when the gas builds up in an enclosed space and is inhaled. Symptoms of carbon monoxide poisoning include headache, nausea, dizziness, and confusion.

The mass of 12 L of carbon monoxide gas at STP can be calculated using the ideal gas law. The ideal gas law states that the product of the
pressure (P),
volume (V),
and temperature (T) of a gas is equal to the mass (m) of the gas multiplied by the universal gas constant (R).
The equation for the ideal gas law is PV = nRT; where n is the number of moles of gas.
At STP, the pressure is 1 atm, the temperature is 273 K, and the universal gas constant is 8.314 J/mol·K. The molar mass of carbon monoxide (CO) is 28.01 g/mol.
Therefore, the mass of 12 L of carbon monoxide gas at STP can be calculated as follows:
m = (12 L)(1 atm)(273 K) / (8.314 J/mol·K)
m = 32.16 g
Therefore, the mass of 12 L of carbon monoxide gas at STP is 32.16 g.

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Answer:

the answer woul be 89 if you do the math right

Explanation:

Answer:

The number of these organisms in the soil would decrease.

Explanation: