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an isotope of phosphorus contains 19 neutrons. construct the symbol for the isotope.

Answer:

Hello How are you

Explanation: the answer might be Screenshot

Answer: Wire gauze is an essential piece of supporting equipment in a laboratory as glassware cannot be heated directly with the flame of a Bunsen burner, and requires the use of wire gauze to diffuse the heat, helping to protect the glassware.

Explanation:

The molecular formula of the compound having an empirical formula BH₃ and a molar mass of 27.6 g/mol is B₂H₆.

Empirical formula is the whole number ratio of the atoms which are present in the compound.

Molecular formula is the number of atoms of each element present in one molecule of compound.

Given -

Empirical formula = BH₃

Molar mass = 27.6 g/mol

We must find the empirical mass of the compound,

Molar mass of B = 10.8 amu

Molar mass of H = 1.00  amu

Therefore,

Empirical mass = 10.8 amu + (3 x 1.00) amu = 13.8 amu

To find molecular formula, we divide the molecular mass by the empirical mass. So,

Molecular formula = Molecular mass

                                  Empirical mass

Molecular formula = 27.6

                                  13.8

Molecular formula = 2

Hence, the molecular formula of the compound is BH₃ = B₁ₓ₂H₃ₓ₂ = B₂H₆

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On the basis of the law of conservation of matter, the missing coefficient for water is 6 in the process of cellular respiration. Thus, the correct option is 1.

It is possible to define cellular respiration as a chemical process that results in the breakdown of food inside the cell and the release of ATP, which is a type of energy.

It entails the chain of chemical processes through which organic materials are oxidized to provide energy to living things.

The left side of the equation has 6 molecules. The equation must be balanced so it must be 6 for the coefficient of water.

C₆H₁₂O₆

Thus, the correct option is 1. six, 6.

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The question is incomplete. Your most probably complete question is given below:

1. 6

2. 8

3. 4

4. 2

The more the volume of the substance less dense will be the substance. The sample of liquid aluminum with a density of 2.7 g/cm³ has a volume of 1.62 cm³.

The volume has been the space that is in inverse relation to the density of the substance and gets increased with less dense substances while decreasing with more dense substances.

Given,

Mass of aluminum = 4.39 gm

Density of aluminium = 2.7 g/cm³

The volume of Al is calculated as:

Volume = Mass ÷ Density

V = 4.39 ÷ 2.7

= 1.62 cm³

Therefore, the volume of liquid aluminum is 1.62 cm³.

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Mass is an extensive property of a matter which describes the number of particles in a matter. According to the law of conservation of mass "mass can neither be created nor be destroyed." Hence mass is a quantity which never changes whether a particle is in a solid, liquid or gaseous state.

1,63760 money she make from the gold and volume of gold take 5.295 volume is the amount of space occupied by a substance

Here given data is kristen was arrested for stealing 6.532 tons and then She escaped capture for 2.45 days and then she had already hid some of the gold, but had 2.34 tons of gold still with her

We have to find how much money did she have if 2.34 tons of gold still with her = ? and how volume does gold take up = ?

Volume is the amount of 3D space a substance or object occupies

We have to convert 2.34 tons into money

Then  2.34 tons =  1,63760 money

And the formula to find volume is:

volume = mass/density

Mass of gold = 196.96 and density = 18.31

Volume = mass of gold / density

Volume = 196.96 / 18.31

Volume = 5.295

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Answer:

Water is H2O which is a compound and would therefore not be on the periodic table. The periodic table only consists of elements.

The ksp value for calcium hydroxide at this temperature is 5.20 × 10⁻⁶.

Ksp is an equilibrium constant of a solid substance dissolved in a liquid solution.

Given that, the volume of water is 0.178 l, 0.264 g of Ca(OH)² dissolves in enough water

The solution equilibrium is

Ca(OH)² = Ca + 2OH

The molar solubility is

0.186 / 74.00  / 0.230 = 0.0109 M

The ksp value will be

Ksp = (s) (2S)²

Putting the values in the formula

(0.0109) x (2 x 0.0109)² = 5.20 × 10⁻⁶.

Thus, the ksp value for calcium hydroxide is 5.20 × 10⁻⁶.

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Answer:

c

Explanation:

As we know science is all about fact so from many years scientist use to predict the future or events so answer is in my opinion c

Taking into account the definition of density, the density of the pen is 1.8523 g/mL.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume.

In this case, you know that:

Replacing in the definition of density:

density= mass of the pen÷ volume of the pen

density= 24.08 g÷ 13 mL

Solving:

density= 1.8523 g/mL

In summary, the density of the pen is 1.8523 g/mL.

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All of the given procedures are used to reduce the amount of acid rain in the environment except using leaded gasoline in automobiles; option D.

Acid rain refers to the condition in which oxide gases of non-metals released from combustion of fossil fuels dissolve in rain water to form acids which is then called acid rain.

Acid rain is mainly formed when sulfur oxides and nitrogen oxides released  from combustion of fuels dissolve in rainwater.

Acid rain results in polluted water an also affects the organisms found in the environment.

Some  procedures used to reduce the amount of acid rain in the environment include:

Therefore, using leaded gasoline in automobiles will not reduce the amount of acid rain in the environment.

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The empirical formula of iron oxide is Fe2O3 and its name is ferric oxide.

Given:

Solution:

Now, calculate the relative mass of iron in iron oxide = Percentage of iron by mass / At. mass of iron

Relative mass of iron = 70/55.85 = 1.25

Relative mass of oxygen = Percentage of oxygen by mass / At. mass of iron = 30/55.85 = 1.88

Now the calculate the molar ratio of iron to oxygen = 1.25 : 1.88 = 2:3

Thus, the empirical formula of iron oxide is Fe2O3 and its name is ferric oxide.

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Safety rules are the regulatory actions that need to be followed to prevent any danger. Following all safety instructions in laboratory text or by assistant does not apply in an organic chemistry lab. Thus, option D is correct.

Laboratory safety rules are the guidelines that are supposed to be followed by the person working in the laboratory while performing the experiments. While working in the organic chemistry lab one should never remove the equipment.

One should wear safety goggles and should not perform the experiments in absence of a teaching assistant. But it is not necessary to follow all the rules in the laboratory textbook.

Therefore, in option D. all rules of the information textbook are not necessary to be followed.

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polar attractions are ... polar attractions are  (a), (b), and (c) are correct.

Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells.

Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells. can happen inside a water molecule and can develop between H and N.

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can pull or pull away from one another (opposite charges attract, alike charges repel).

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The density of the gold colored metal beads if mass is 425 g and volume of 47.5mL is 8.9 g/mL.

Density is defined as the ratio of the Mass of the substance to the volume of the substance.

It's SI unit is kg/m3.

It is denoted by ρ or rho.

Density = mass/volume

From the given data, we noticed that,

Mass of gold colored metal beads = 425g

Volume of the gold colored metal beads = 47.5mL.

By substituting all the value, we get

= 425/47.5

= 8.9

Thus, we concluded that the density of the gold colored metal beads if mass is 425 g and volume of 47.5mL is 8.9 g/mL.

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The accurate phrases abut the study design and validity are:

The role of light in the growth of plants is important as light is necessary for photosynthesis.

The growth regions of a plant are the shoots and the roots.

The shoots of plants show positive phototaxis by growing towards a unidirectional light source.

A unidirectional light source is light that comes from one direction.

The growth region of the shoot, that is the tips produces hormones which enable the tip of the plant to grow towards the light source.

Considering the given experiment , the accurate phrases abut the study design and validity are:

In conclusion, the experiment to demonstrate the bending of plants shoots towards a light source should include a control and must be repeated by other researchers,

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Answer: The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you. They are found throughout your body, mostly as water but also as components of biomolecules such as proteins, fats, DNA and carbohydrates.

Explanation:

The aluminum sulfate stock solution should the chemist pour out is 219.8 ml

Complete Question

A chemist must prepare 400 mL of 1.00M aqueous aluminum sulfate working solution. He'll do this by pouring out 1.82 mol/L aqueous aluminum sulfate stock solution into a graduated cylinder and diluting it with distilled water. How many mL of the aluminum sulfate stock solution should the chemist pour out?

The aluminum sulfate stock solution should the chemist pour out is 219.8 ml

Given:

V1 = 400ml, M1 = 1 M, V2 = ?, M2 = 1.82 M

Hence, the relation between molarity and volume is as follows.

M1V1 = M2V2

1.00M x 400ml = 1.82 x V2

V₂ = 219.8 ml

Thus, we can conclude that 219.8 ml of the aluminum sulfate stock solution should the chemist pour out.

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Elements in group 2 have a charge of +2 while forming ionic compounds.

While forming ionic compounds , elements of group 2 loose 2 electrons from their valence shell as a result of which charge of +2 is generated on them as electrons are negatively charged.

As like all the other periodic trends, charge also varies across the periodic table. On moving down the group, as  number of valence electrons do not change as a result of which charge too does not change along a group.

But, while moving across a period as electrons are added to the same shell the number of valence electrons no longer remains same rather it increases and so does the charge.

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The ratio of the mass in grams and volume in cubic meters gives the density. The density of 0.80 gm helium is 1.78 × 10 ⁻⁴ g/cm³.

Helium (He) is an inert gas and a chemical element belonging to Periodic Table Group 18 (noble gases). Helium, the second-lightest element (only hydrogen is lighter), is an odourless, tasteless gas that melts at a temperature of 268.9 °C (452 °F).

Helium has lower freezing and boiling points than any other known substance. The only element that cannot solidify by adequate cooling at standard atmospheric pressure is helium; in order to solidify it, pressure of 25 atmospheres at a temperature of 1 K (or 272 °C or 458 °F) must be applied. density (0 °C, 1 atm): 0.1785 grammes per litre

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A glassware that allows a solution to be precisely and slowly added to another solution is a Burette.

Burette, a laboratory apparatus used in quantitative chemical analysis to measure the volume of a liquid or a gas. It consists of a graduated glass tube with a stopcock (turning plug, or spigot) at one end. The tube of the burette is filled with a fluid, such as water, oil, or mercury.

Burette is also used in Titration. It is a process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them.

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Answer:

Amino acids, nucleic acids, and nucleobases are key biological nitrogen compounds.

Explanation:

Answer:

amines and amides

Explanation:

If we are talking organic/biochemistry only I would say amines and amides

When gases in two different containers are same , at same temperature, and same pressure then the number of moles must also be same.

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The option (d) will be correct, that is the answer would be 0.39 mol.

Ideal gas equation is also known by the  name of the general gas equation.

It is already mentioned in the problem,

Volume , V = 5.86 L

Temperature , T = 273 K

Pressure, P = 1.5 atm

Ideal Gas Equation : PV = nRT

n = PV / RT

= 1.5  atm * 5.86 L / 0.0821 L atm mol^-1 K^-1 * 273 K

=  8.79 / 22.41 mol

=0.39 mol

Hence the number of moles of H2 found in the gas sample is 0.39 mol.

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The temperature of the gas is 133.42 kelvin.

Assuming that the gas in the question is ideal, we can apply the ideal gas equation which is as follows:

PV = nRT

Here P is the pressure of the gas = 1.20 atm

V is the volume of the gas = 31.00 liters

N is the number of moles = 3.40 moles

R is the universal gas constant = 0.0821 L atm

T is the temperature of the gas =?

Putting the values in the above equation:

1.20 x 31.00 = 3.40 x 0.0821 x T

T = 1.20 x 31/3.40 x 0.0821

T = 133.42 K

Thus, the temperature of the gas is 133.42 kelvin.

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The correct answer is Nitrogen.

From the given question the electronic configuration of the element is given as:

1s²2s²2p³

hence, we know that the maximum no of electrons in the sub-shell

s= 2

p=6

while in this p has only 6 electrons.

Thus by counting the number of electrons in each sub-shell we can know the atomic number as several electrons in an atom is equal to the atomic number of the atom.

thus, the no of electrons present is- 2+2+3= 7

For, 7 electrons the element present will be nitrogen with atomic number 7.

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move double bond add line pairs to Oxygen and make negative then move a double bond into the hexagon

Answer:

D) HCl + KOH --> KCl + H2O is the answer