what is the electron dot structure of AsClBr2? Pls pls pls help me

Lead is a heavy metal that is present in drinking water in specific small amounts. The maximum amount of lead allowed in drinking water in parts per million is 15 ppm. Thus, option A is correct.

Parts per million (ppm) is the unit of expressing the mass of the substance with respect to the volume of the solution. It is generally used to represent the concentration of the contaminants or chemicals.

Given,

Mass of lead (Pb) = 15 mg

Volume/mass of water = 1 kilogram

The concentration of lead is calculated as,

Mass of Lead  x 10⁶ ÷ Mass of water

=15 × 10⁶ ÷ 1000000

= 15 mg/kg

As it is known that 1 ppm = 1 mg/Kg

So, 15 mg/kg = 15 ppm

Therefore, option A. the maximum level of lead allowed in drinking water is 15 ppm.

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Your question is incomplete, but most probably your full question was, The maximum level of lead allowed in drinking water is 15 mg/kg. What is this concentration in units of parts per million?

Answer:

12 mol

Explanation:

Answer:

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Answer:

Alkane

Explanation:

Alkane is a class of organic compounds that contain only carbon and hydrogen and the carbon atoms are connected to each other by single bonds.

Now, if we look at the molecule whose condensed structural formula is shown in the question, we will notice that the compound can only contain single bonds. That is, the molecule is a saturated hydrocarbon(alkane).

I have drawn out the full structure of the compound to illustrate this point.

Answer:

C

Explanation:

The statement that explains whether NaCl or BeO will have a stronger bond is D. BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions

A chemical bond simply means the attraction between ions, atoms, or molecules which then leads to the formation of chemical compounds.

It should be noted that Beryllium oxide with the chemical formula BeO has a stronger bond than Sodium Chloride due to the fact that it has a smaller ionic charge, and a smaller distance between ions

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Answer: 1.11 g/mL

Explanation:

Density = mass/vol

mass 123.0194-120.3621g = 2.6574

vol 6.518-4.126 ml = 2.392

Answer:

The mass of 4.76 moles lithium phosphate is 551.16 grams.

Explanation:

Given that,

Number of moles, n = 4.76

We need to find the mass of 4.76 moles of lithium phosphate.

The chemical formula of lithium phosphate is Li₃PO₄.

Mass of Li₃PO₄ will be :

Li₃PO₄ = 3(6.941) + 30.97+4(16)

= 115.79 g/mol

The number of moles is given by :

[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=4.76\times 115.79\\\\m=551.16\ g[/tex]

So, the mass of 4.76 moles lithium phosphate is 551.16 grams.

Answer:

Explanation:

²⁴²₉₅Am  ⇒  ₉₆²⁴²Cm + ₋ ₁e .

The product nucleus is Curium .

Answer:

Explanation: The answer is B. Because meiosis process produce genetically different, haploid cells. Also, meiosis basically happen to produce gametes. Gametes is haploid. So, the answer is B

Meiosis is a method for cell division taking place in some organisms. In meiosis the cell the cells produced at the end of meiosis contain half the number of chromosomes as the parent cell. Hence, option C is correct.

meiosis is biological process by which the cell undergo division to produce genetically identical daughter cells. Other methods of cell divisions include mitosis, binary division, budding etc.

The first stage of meiosis includes pairing homologous chromosomes and they segregate to opposite ends of the meiotic spindle.This phase is known as reduction division where, the number of chromosome reduces to half.

This differentiated chromatids separates out in the second phase and yielding the haploid cells. Hence, in meiosis, the cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.

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Answer:

Low power

Explanation:

Low power would allow for the full image of the red blood cells and would appear as small circles.

Answer:

The mole is simply a very large number that is used by chemists as a unit of measurement.

Explanation:

The mole is simply a very large number,

6.022

×

10

23

, that has a special property. If I have

6.022

×

10

23

hydrogen atoms, I have a mass of 1 gram of hydrogen atoms . If I have

6.022

×

10

23

H

2

molecules, I have a mass of 2 gram of hydrogen molecules. If I have

6.022

×

10

23

C

atoms, I have (approximately!) 12 grams.

The mole is thus the link between the micro world of atoms and molecules, and the macro world of grams and litres, the which we can easily measure by mass or volume. The masses for a mole of each element are given on the periodic table as the atomic weight. So, if have 12 g of

C

, I know, fairly precisely, how many atoms of carbon I have. Given this quantity, I know how many molecules of

O

2

are required to react with the

C

, which I could measure by mass or by volume.

Answer:

AgCl formula for silver(l) chloride

Answer:

AKWIJKNZQSOKQPALQALQPALALQLLKILILI

Answer:

1. solid

2. liquid

3. plasma

4. gas

Those are the four parts of matter.

Explanation:

I hope this helps.

Answer:

1. If an organism has high biological fitness in one habitat, this does not mean it will have high fitness in another. This is because organisms adapt accordingly to their environment. Therefore, since there is variability among habitats, this does not guarantee that the organism will always have high biological fitness.

2. Natural selection produces changes in populations. Individual organisms are directly impacted by it, as it determines their survival rate, but the only genetic changes would occur in a population.

3. If there are no organisms with varying traits in a population, they will likely go extinct after a major environmental change. This is because natural selection will remove all organisms who are unable to survive in the new environment. If the population does not have the variability to survive this, then they will go extinct.

If an organism has a high biological fitness in one habitat, then it doesn't guarantee a high biological fitness in a different habitat; natural selection does change the individual. The population will go extinct if the individuals can't reproduce.

The individual that lives in an ecosystem can change itself due to natural selection, as natural selection favors the individuals who can survive in the changing environment, and the change in the environment induces the change in the organism. There is no reproductive success if the organisms are reproductively isolated within the population.

Hence, if an organism has a high biological fitness in one habitat, it doesn't guarantee a high biological fitness in a different habitat; natural selection does change the individual. The population will go extinct if the individuals can't reproduce.

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Answer:

[tex]d=2.15g/mL[/tex]

Explanation:

Hello there!

In this case, since the density of the metal is computed as shown below:

[tex]d=\frac{m}{V}[/tex]

We need to calculate the volume of the solid by subtracting the final volume and the initial volume of water:

[tex]V=54.10mL-45.50mL\\\\V=8.60mL[/tex]

Thus, we obtain:

[tex]d=\frac{18.5g}{8.60mL}\\\\d=2.15g/mL[/tex]

Best regards!

Answer:

85.6 g

Explanation:

Step 1: Write the balanced combustion equation

C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O

Step 2: Calculate the moles corresponding to 140 g of H₂O

The molar mass of H₂O is 18.02 g/mol.

140 g × 1 mol/18.02 g = 7.77 mol

Step 3: Calculate the moles of C₃H₈ needed to produce 7.77 moles of H₂O

The molar ratio of C₃H₈ to H₂O is 1:4. The moles of C₃H₈ needed are 1/4 × 7.77 mol = 1.94 mol.

Step 4: Calculate the mass corresponding to 1.94 moles of C₃H₈

The molar mass of C₃H₈ is 44.10 g/mol.

1.94 mol × 44.10 g/mol = 85.6 g

Answer:

1 on each compound there

Explanation:

A balanced reaction is a reaction that has the same number of atoms in the reactants and products. If this number is not the same, we need to balance it putting some numbers as coefficients behind the compound or element that needs to be balanced, For example:

NH₃ ------> N₂ + H₂

As you can see in this reaction, we have 1 nitrogen and 3 hydrogens in the reactants, and in the side of products we have 2 of each element. This needs to be balanced. To do this we put a number as coeffcient to balance the atoms. In this case, we can put a number 2 behind the NH₃, so the number of atoms of nitrogen becomes 2:

2NH₃ ------> N₂ + H₂

But this 2, changes the number of hydrogens, we now have 6 (cause 2 * 3 = 6), so, let's balance hydrogen on the products to be 6, putting a 3:

2NH₃ ------> N₂ + 3H₂

Now, the reaction is balanced in each side of the reaction.

Applying the same principle to the reaction of this exercise we have the following:

NaCl(aq) + AgNO₃(aq) ---------> AgCl(s) + NaNO₃(aq)

As you can see, we have the same number of atoms on each side:

Na: 1;    Cl: 1;    Ag: 1;  N: 1;  O: 3

So we don't need to balance this reaction, with just putting the number 1 or none, is perfectly balanced.

Hope this helps

Answer:

Yes

Explanation:

One of the top goals of genetic engineering is the improvement of health. Imagine a world without the threat of AIDS or cancer. Those working in the genetics field hope that manipulating the genes of humans will one day enable science to prevent people from contracting these potentially deadly diseases.

Answer:

54 °C

Explanation:

Step 1: Given and required data

Step 2: Calculate the initial temperature of water

We will use the following expression.

Q = c × m × (T₂ - T₁)

5.79 × 10⁵ J = 4.184 J/g.°C × 3010 g × (100 °C - T₁)

T₁ = 54 °C

Answer:

option c. 4,1,2

Explanation:

No. of atoms of each element in reactant is equal to that of products

Answer:

[tex]n_{KClO_3}=0.0353molKClO_3[/tex]

Explanation:

Hello!

In this case, according to the experiment, we first realize that the pressure of oxygen is:

[tex]p_{O_2}=1.00atm-26.0/760 atm=0.966atm[/tex]

Next, we compute the moles based off the ideal gas law:

[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{0.966atm*1.35L}{0.08206\frac{atm*L}{mol*K}*300K}=0.0530molO_2[/tex]

Thus, since there is 3:2 mole ratio between oxygen and potassium chlorate, we can compute the consumed moles of the latter as shown below:

[tex]n_{KClO_3}=0.0530molO_2*\frac{2molKClO_3}{3molO_2} \\\\n_{KClO_3}=0.0353molKClO_3[/tex]

Best regards!

The number of atoms in Mg wpuld be one atom

Answer:

C. It would stay the same

Explanation:

PLATO answer

Answer:

Explanation:

physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.

Answer:

Anything that takes up space.

Explanation:

Anything that has both volume and mass.