A man works in an aluminum smelter for 12years. the drinking water in the smelter contains0.075mg/l arsenic and 0.580mg/l methylene chloride. his only exposure to these chemicals in water is at work.
a. What is the hazard index (HI) associated with this exposure?
b. Does the HI indicate this is a safe level of exposure?
C. What is the incremental lifetime cancer risk for the man due solely to the water he drinks at work? Does it seem to be an acceptable risk according to EPA?

Answer:

b. 1...1...1

Explanation:

If you were going to cook spaghetti in boiling water, the compound that should be put in the water to speed up the cooking by increasing boiling point is salt (ionic). 

The boiling point is the temperature at which the liquid turns to vapor. It happens when the vapor pressure equals the pressure of the surrounding air.

The boiling point for water is 100 degrees Celsius at sea level. It needs a bit of energy to make water to a boil. In fact, you need 1 calorie of energy to raise 1 gram of water by 1 degree Celsius. 

The way to raise the boiling point of a liquid is by increasing the temperature or adding a solute, such as salt. Adding a solute to the liquid will create stronger bonds between molecules. It makes the water molecules to escape from the pot harder.

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Answer:

the hawk

Explanation:

in order it would be: producer, primary, secondary, tertiary

Answer:

the hawk is the tertiary consumer

Taking into account the reaction stoichiometry, 165 moles of Al are required to produce 495.0 grams of H₂.

In first place, the balanced reaction is:

6 NaOH + 2 Al  → 2 Na₃AlO₃ + 3 H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 6 grams of H₂ are produced by 2 moles of Al, 495 grams of H₂ are produced by how many moles of Al?

moles al Al= (495 grams of H₂×2 moles of Al) ÷6 grams of H₂

moles of Al= 165 moles

Finally, 165 moles of Al are required.

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Answer:

True

Explanation:

Answer:

True

Explanation:

A neutral atom must have an equal amount of protons as electrons.  

Nitrogen is the most common gas in Earth's atmosphere primarily because of its stable molecular structure and abundance in Earth's crust. It makes up about 78% of the atmosphere and plays a crucial role in supporting life on Earth.

Nitrogen gas (N2) is abundant in the atmosphere due to several factors. Firstly, nitrogen is a relatively inert gas, meaning it does not readily react with other elements or compounds. This stability allows nitrogen to accumulate in the atmosphere over long periods of time. Additionally, nitrogen is a major component of organic matter and is recycled through various biological and geological processes, contributing to its abundance. Nitrogen-fixing bacteria in the soil and legume plants also convert atmospheric nitrogen into forms usable by other organisms.

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Answer:

you can use the example of two magnets

Answer: The gravitational force Increase as the objects get closer.

Explanation:

The mass of glucose which contains a million oxygen atoms is 0.002 g as 1 glucose molecules contains 6 oxygen atom.

Glucose is defined as a sugar having the molecular formula \(C_{6} H_{12} O_{6}\). It is the most abundant monosaccharide. It is the subcategory of carbohydrates. It is mainly made by plants and most algae during photosynthesis from water and carbon dioxide using energy from the sunlight as it is used to make cellulose in cell walls. Glucose is classified as a monosaccharide containing six carbon atoms and consist of an aldehyde group.

1 glucose molecule contains 6 oxygen atoms.

so, = 2.66 x \(10^{-17}\) g) / ( 6 x 1.66 x 10^-22 g/mole)

    = 0.002 g

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Answer:10

Explanation:

Multiply the volume by the density to get the mass.

Divide the mass by the molar mass to get the number of moles.

The states of matter of the materials;

1) Dispersion forces - Yes

2) Hydrogen bonding - No

3) Ionic - No

4) Dispersion forces - No

5)  Dispersion forces - Yes

6) Ionic  - No

7) Hydrogen bonding - No

Sublimation is a physical process in which a substance transitions directly from its solid phase to its gaseous phase without passing through the intermediate liquid phase. In sublimation, the solid substance is heated, and the resulting gas molecules escape from the solid lattice structure without the need for melting.

One common example of sublimation is the process of dry ice. Dry ice is solid carbon dioxide (CO2) that sublimes at a temperature of -78.5 degrees Celsius (-109.3 degrees Fahrenheit). When dry ice is exposed to room temperature, it transitions directly from a solid to a gas, producing a fog-like effect.

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Answer:

Explanation:

To find the new concentration of the solution, we need to use the dilution formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

In this case, the initial concentration is 1.00 M and the initial volume is 295 mL, while the final volume is 2.25 L. We can plug these values into the dilution formula to solve for the final concentration:

C2 = (C1V1)/V2

= (1.00 M)(295 mL)/(2.25 L)

= 0.131 M

Therefore, the new concentration of the solution is 0.131 M.

Mixtures are a group of elements that are mixed together but not chemically combined

Elements are the fundamental materials of which all matter is composed.

Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Approximately 1.693 grams of calcium will be produced when 4.7 grams of calcium chloride are completely used up in the reaction.

To determine the grams of calcium produced, we need to calculate the molar ratio between calcium chloride (CaCl2) and calcium (Ca) in the balanced chemical equation for the reaction. The balanced equation is:

2Al + 3CaCl2 → 3Ca + 2AlCl3

From the balanced equation, we can see that for every 3 moles of calcium chloride, 3 moles of calcium are produced. We need to convert the given mass of calcium chloride (4.7 grams) to moles using its molar mass.The molar mass of CaCl2 is calculated by adding the atomic masses of calcium (Ca) and chlorine (Cl). The atomic mass of calcium is 40.08 g/mol, and the atomic mass of chlorine is 35.45 g/mol.

Molar mass of CaCl2 = (40.08 g/mol) + 2(35.45 g/mol) = 110.98 g/mol

Now we can calculate the moles of calcium chloride:

Moles of CaCl2 = (mass of CaCl2) / (molar mass of CaCl2)

              = 4.7 g / 110.98 g/mol

              ≈ 0.0423 mol

Since the molar ratio between calcium chloride and calcium is 3:3, the moles of calcium produced will be equal to the moles of calcium chloride used.

Moles of Ca = 0.0423 mol

To convert moles of calcium to grams, we multiply by the molar mass of calcium:

Mass of Ca = (moles of Ca) × (molar mass of Ca)

          = 0.0423 mol × 40.08 g/mol

          ≈ 1.693 g

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The δh° for the process SB (s) + Cl2 (g) → SbCl5 (s) is -394 kJ using Hess's-Law.

Hess's Law states that the enthalpy change of a reaction is independent of the pathway taken and depends only on the initial and final states. By combining the given reactions, we can cancel out the intermediate compound (SbCl3) and obtain the desired reaction. The enthalpy change for the first reaction (SB (s) + Cl2 (g) → SbCl3 (s)) is -314 kJ, and for the second reaction (SbCl3 (s) + Cl2 (g) → SbCl5 (s)) is -80 kJ. By adding these two reactions, we obtain the overall reaction with a δh° of -394 kJ.

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A warm liquid usually has the lowest density among the given options.

Generally, substances expand and become less dense as they are heated, and this behavior is commonly observed in liquids. As a liquid is warmed, the molecules gain kinetic energy and move more rapidly, leading to an increase in the average distance between the particles. This expansion results in a decrease in the density of the liquid.

On the other hand, solids tend to have a higher density compared to liquids. While cooling a solid may cause a decrease in its volume, the change is usually not significant enough to make it less dense than a warm liquid.

Therefore, among the given options, a warm liquid is likely to have the lowest density.

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The bond is highly polar is the scientific claim about the bond in the molecular compound HF is most likely to be true.

The term polar means that there is separation of charges, the bonds will be the more polar the greater the difference in electronegativity between the bonded atoms.

Therefore, we can conclude that the bond is highly polar is the scientific claim about the bond in the molecular compound HF is most likely to be true.

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Answer:

467

Explanation:

ncl2 = 454.4x1/(71.0 g/mol) = 6.40 mols cl2

6.40 mols cl2 x 2molsHCL/1moleCL2 x 36.5g/1moleHCL = 467 g HCL

One mole of chlorine gas gives two moles of hydrogen chloride. Thus, 454.4 g of chlorine gas will give 467.2 g of hydrogen chloride.

Hydrogen chloride is a covalent compound formed by the electron sharing of chlorine and hydrogen. It normally exists in gaseous state and can be liquified to the acidic form.

As per the balanced reaction one mole of chlorine gas gives two moles of hydrogen chloride gas. The molecular mass of chlorine gas is 71 g/mol. The molar mass of HCl is 36.5 g/mol.

Hence, 71 g of chlorine gas gives 73 g of HCl. Then, the mass of HCl produced from 454.4 g of chlorine gas is calculated as follows:

mass of HCl = (454.4 × 73) / 71

                     = 467.2 g.

Therefore, the mass of HCl produced from 454.4 g of chlorine gas is 467.2 g.

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Answer:

B. melting of ice caps

Explanation:

Answer:

You haven't provided us with ' the following pieces of

data'

Answer:

Using twice the volume of MgCl2(aq)MgCl2(aq) and twice the volume of NaOH(aq)NaOH(aq)

Explanation:

The amount of Mg(OH)2 is doubled when the volume of the reactants is doubled because they still react in the ratio of 2:1.

The reaction between MgCl2 and NaOH occurs as follows;

MgCl2(aq) + 2NaOH(aq) -----> Mg(OH)2(s) + 2NaCl(aq)

We can see that the mole ratio of the reactants is 1:2.

Initial number of moles of MgCl2 = 100/1000 L × 0.1 M = 0.01 moles

Initial number of moles of NaOH =  100/1000 L × 0.2 M = 0.02 moles

If i double the volume of each reactant;

Number of moles of MgCl2 = 200/1000 L  × 0.1 M = 0.02 moles

Number of moles of NaOH =  200/1000 L  × 0.2 M = 0.04 M

We can see that the amount of Mg(OH)2 is doubled when the volume of the reactants is doubled because they still react in the ratio of 2:1.

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Answer:

A molecular compound is usually composed of two or more nonmetal elements. Molecular compounds are named with the first element first and then the second element by using the stem of the element name plus the suffix -ide.

A valid Lewis structure of SO3 cannot be drawn without the central atom violating the octet rule. The correct option is b.

The octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight electrons in their outermost shell.

In the case of SO3, sulfur (S) is the central atom surrounded by three oxygen (O) atoms. Each oxygen atom needs two electrons to complete its octet, while sulfur needs six electrons to complete its octet.

However, if we distribute the electrons according to the octet rule, each oxygen atom would share two electrons with sulfur, leaving sulfur with only six electrons.

One possible Lewis structure for SO3 is to form a double bond between sulfur and one oxygen atom and single bonds with the remaining two oxygen atoms. In this structure, sulfur has ten electrons around it, violating the octet rule.

The Lewis structure would look like this:

O

//

S

\

O

To accommodate the octet rule, sulfur in SO3 can expand its valence shell by utilizing its empty d orbitals. This allows sulfur to accommodate more than eight electrons around it, but it violates the octet rule.

In summary, a valid Lewis structure of SO3 cannot be drawn without the sulfur atom violating the octet rule because sulfur would require more than eight electrons to satisfy the octet rule. The correct option is b.

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Answer:

J. Their momentum is conserved

Explanation:

According to the diagram, the best statement that describes what happens when two astronauts collides in space is that their momentum is conserved.

The momentum before collision is 320kgkm/hr and after collision it is 320kgm/s

 This collision is an inelastic collision;

    momentum before  = momentum after

              m₁v₁ + m₂v₂     =       v(m₁ + m₂)

m₁ = 80kg

v₁  = 4km/hr

m₂ = 80kg

v₂  = 0

v  = 2km/hr

 Insert the parameters;

              (80 x 4) + (80 x 0)    = 2(80 + 80)

                    320                      = 320

The standard deviation and per cent relative standard deviation, which represent the uncertainty in the molarity of your EDTA titrant.

To calculate the uncertainty in the molarity of your EDTA titrant, we need some information about the measurements taken during the titration process. However, since the information is not provided, I will give you a general step-by-step guide to finding the uncertainty in molarity:
1. Record the volume measurements (in mL) for each titration trial.
2. Calculate the molarity of the EDTA titrant for each trial using the balanced equation of the reaction and the known molarity and volume of the analyte solution.
3. Find the mean (average) molarity of the EDTA titrant by summing the molarities calculated in step 2 and dividing by the total number of trials.
4. Calculate the deviation for each trial by subtracting the mean molarity from the molarity of each trial.
5. Square each deviation calculated in step 4.
6. Sum the squared deviations and divide by the total number of trials minus one (n-1) to find the variance.
7. Calculate the standard deviation by taking the square root of the variance.
8. Calculate the per cent relative standard deviation by dividing the standard deviation by the mean molarity and multiplying by 100.
After following these steps, you will have found the standard deviation and per cent relative standard deviation, which represents the uncertainty in the molarity of your EDTA titrant.

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Co2

Explanation:

CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (l)

Answer:

C - CO

Explanation:

Correct on EDGE

Answer:

Between galaxies, retake the measurement.

Explanation:

Among both galaxies, reiterate the measurements. Instead of utilising a balloon, a scientist might create a model that shows in which everything really is and how cosmos is expanding rather than expanding. By inflating up the atmosphere to 1/2, 3/4, and full size, continue the operation.