dental cement, Zn3(PO4)2

Give only the names of the elements alphabetically, separating them with commas.

When Br2(l) boils at its normal boiling point, its entropy increases as it is positive.

The level of randomness found inside a substance's molecules is known as entropy.

The temperature at which atmospheric pressure and a liquid's vapor pressure are equal is known as the boiling point.

The amount of heat energy required to convert one mole of a substance from its liquid state into its gaseous state at constant temperature and pressure is referred to as the molar enthalpy of vaporization.

Entropy increases when a liquid is heated because the randomness between the molecules increases. As a result, entropy will rise.

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The first mistake that the student made is drawing the start line with ink. So it will run/dissolve in the solvent / split up

The second mistake that the student made is placing the solvent above the spots or start line instead of under them. So they will mix with solvent or wash off paper or color the solvent or dissolve in the solvent.

In the first mistake, there is no clear, visible starting line for the experiment as the ink flows or dissolves in the solvent. This error can lead to confusion and inaccuracy in results as students cannot accurately measure or compare the progress of their experiments.

The second mistake, it mixes or washes away the solvent with the dirt and starts the line, making it difficult or impossible to observe or measure the progress of the experiment. This error can also lead to inaccuracies in results, as students may not be able to accurately measure or compare the progress of their experiments.

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Answer:

0.89 times

Explanation:

Let the initial volume of the tank be V.

Finally, we shall determine how much larger the final volume of the gas will be. This is illustrated below:

Initial pressure (P₁) = 130 kPa

Initial volume (V₁) = V

Final pressure (P₂) = 145.5 kPa

Final volume (V₂) =?

P₁V₁ = P₂V₂

130 × V = 145.5 × V₂

130V = 145.5 × V₂

Divide both side by 145.5

V₂ = 130V / 145.5

V₂ = 0.89V

Therefore, the final volume of gas will be 0.89 times the initial volume.

The mathematical expressions written using a single exponent are as follows:

4⁴(4⁷) = 4¹¹

5⁹/5³; a = 6

(6²)⁷ = 6¹⁴

A number or letter written above and to the right of a mathematical expression known as the base is termed an exponent. It denotes that the base is to be increased in strength.

Consider the following expression: xⁿ

In the given expression above, the base is x, while the exponent or power is n. For expressions having the same base, the exponents are added if the expressions are to multiplied, and subtracted when the expressions are to be divided.

The exponents are multiplied if the exponents are raised to a power.

Considering the given expressions:

4⁴(4⁷) = 4¹¹

5⁹/5³ =  5⁶

Hence, a = 6

(6²)⁷ = 6¹⁴

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Answer:

Atomic orbital

Explanation:

Electrons are found around the atomic nucleus in three-dimensional regions.

The energy levels they are in can be named according to a numbering order such as 1, 2, 3, 4, ..., increasing in proportion to the distance to the nucleus. Each of these energy levels can be divided into sublevels s, p, d, f which are also called orbitals.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

[tex]n = \frac{3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3}{6.02} \\ = 0.49833...[/tex]

We have the final answer as

Hope this helps you

Atoms are basically the smallest units of matter. They are made up of  protons, neutrons and electrons.

The periodic table is a tabular arrangement of the chemical elements which are organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. The periodic table lists the elements in order of increasing atomic number and grouped into rows (periods) and columns (groups). The elements in the same column have similar chemical properties, with the elements in the same row having similar outer electron configurations.

Atom X: Number of protons = 6

Atom Y: Number of protons = 6

b. Atoms X and Atom Y are in the same family; but not the same row; in the periodic table.

Hence, Option B is correct.

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The question is:

Question 3 (5 points) (02.06 MC) The table compares some characteristics of two atoms_ Charged Particles Atom Number 0f Neutrons Mass Number] Use the table t0 determine the number of protons for each atom: Then_ choose the statement below that Is true about the two atoms_ points) Atom X and Atom are in the same row; but not the same family; on the periodic table Atoms X and Atom Y are in the same family; but not the same row; in the periodic table; Atom Xis in a column to the right of Atom Y in the periodic table: Atom X and Atom occupy the same position in the periodic table because they are isotopes.

Answer:

the entry of harmful foreign particles into the atmosphere is known as pollution there are 7 main types of pollution namely air ,water,light ,sound, thermal , radioactive,land pollution.we can reduce sound pollution by making green zones around schools and hospitals

Answer:

5.45*10⁻⁴ moles of silane gas (SiH₄) are present in 8.68 mL  measured at 18°C and 1.50 atm.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

Replacing:

1.5 atm* 0.00868 L= n* 0.082[tex]\frac{atm*L}{mol*K}[/tex] *291 K

Solving:

[tex]n=\frac{1.5 atm*0.00868 L}{0.082 \frac{atm*L}{mol*K}*291 K}[/tex]

n= 5.45*10⁻⁴ moles

5.45*10⁻⁴ moles of silane gas (SiH₄) are present in 8.68 mL  measured at 18°C and 1.50 atm.

Answer:

Specific heat capacity of iron (c) = -0.04 J/g°C

Explanation:

Given:

Mass of sample of iron M = 716.4 gram

Change in temperature Δt = -33.47°C

Heat energy Q = 996.6 joules

Find:

Specific heat capacity of iron (c)

Computation:

We know that

Q = McΔt

So,

c = Q / M[Δt]

Specific heat capacity of iron (c) = 996.6 / (716.4)(-33.47)

Specific heat capacity of iron (c) = 996.6 / -23,977.908

Specific heat capacity of iron (c) = -0.0415

Specific heat capacity of iron (c) = -0.04 J/g°C

Federal Marshals will receive trafficking penalty for attempting smuggling.

Human trafficking, also referred to as trafficking in persons, is a crime that entails forcing or coercing a person to perform work or services or engage in sexual acts for monetary gain. The exertion of pressure may be covert or obvious, physical or psychological.

A conviction for keeping someone in servitude carries potential fines and a maximum 20-year prison sentence in a federal facility. The maximum penalty is life in prison if there is a death as a result of the violation or if it involved kidnapping, sexual assault, or other aggravating circumstances.

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Answer:

n = 12.18 moles

Explanation:

Given that,

The volume of a canister, V = 1 L

The temperature of the canister, T = 100 K

Pressure, P = 100 atm

We need to find the number of moles of gas. Let there are n number of moles. We know that,

PV = nRT

Where

R is gas constant, R = 0.0821 L*atm/mol*K

[tex]n=\dfrac{PV}{RT}\\\\n=\dfrac{100\times 1}{0.0821 \times 100}\\\\n=12.18\ moles[/tex]

Hence, there are 12.18 moles of gas.

Answer:

it is option no B using mole concept

Answer:

The correct answer is 77.0 g.

The relationship between properties and substances is an important one as the properties define or describe the type, kind or composition of a substance. There are two factors that affect the properties of a substance and these are kinetic energies and intermolecular forces.

In chemistry, substances are categorized on the basis of physical and chemical properties. All the substances are composed of tiny particles which are in constant motion due to kinetic energy and keep moving in all directions in a substance.

In addition to this, intermolecular forces are also present in a substance which keeps the particles together. In this way substances maintain their shape, arrangement and properties such as melting point, boiling point, hardness, composition and color due to their particular properties.

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Answer:

sp3d

Explanation:

The ground state electronic configuration of tin is; [Kr] 5s²4d¹⁰5p². Hybridization is a valence bond concept that postulates that orbitals of appropriate energy could be mixed in order to produce suitable orbitals that could be used for bonding.

In the formation of Snf5^ -1, there is a hybridization of the 5p, 5d and 6s orbitals to yield the sp3d orbitals required for the formation of the chemical specie hence the answer.

Since lead has a density of 11.53 g/cm^3, the volume of a 0.255 pound sample of lead is equal to 10.03 cm³.

In Science, the density of a chemical substance such as lead can be calculated by using this formula:

Density = M/V

Where:

Next, we would convert the value of the mass in pound to grams by multiplying it by 453.6 as follows;

Mass = 0.255 × 453.6

Mass = 115.668 grams

Making volume the subject of formula, we have:

Volume = Mass/Density

Volume = 115.668/11.53

Volume = 10.03 cm³.

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Answer:

the answer is d which is soap solution because it's a soap solution that can measure the degree of hardness of a water if the water forms with this soap solution then the water is hard but if the water forms foam with soap then it is soft

Answer:

soap solution because when it is combined with water you can get to your answer and that it is right or experiment it

The equivalent point's pH is 3.60.

A numerical measure of how acidic or basic aqueous or other liquid solutions are is called pH, and  The expression, which is widely used in chemistry, biology, and agronomy, translates the hydrogen ion concentration, which normally ranges between 1 and gram-equivalents per liter, into values between 0 and 14. Since pure water has a pH of 7, or gram-equivalents per liter of hydrogen ions, it is neutral (neither acidic nor alkaline). An alkaline or basic solution has a pH over 7, whereas one with a pH below 7 is described as acidic.

HNO2 = 0.100M

KOH= 0.200M

pKa = 3.34

using a formula

pH = pKa + log (salt/acid)

= 3.34 + log (0.200/0.100)

= 3.34 + log 2

= 3.34 + 0.30

= 3.60

The equivalent point's pH is 3.60.

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Answer:

The mass is not a vector.

because It has only magnitude but not direction.

1.53 × 10⁻⁵ moles of aspartame are present in 4.50 mg of aspartame.

Two amino acids, aspartic acid and phenylalanine, make up the low-calorie sweetener known as aspartame. In addition to being present in tabletop sweetener packets, aspartame is a common component used to substitute sugar in low-calorie foods and beverages.

Here there are 4.50 mg of aspartame.

First, the mass is converted from mg to g by:

1 g = 1000 mg

So, 1 mg = 0.001 g

So, 4.5 mg = 4.5 × 10⁻³ g

Molar mass of aspartame = 294.40 g/mol

So, Number of moles of aspartame = [tex]\frac{Given mass}{Molar mass}[/tex]

or, n = 4.5 × 10⁻³ / 294.3

or, n = 1.53 × 10⁻⁵ moles.

Hence, 4.50 mg of aspartame has 1.53 × 10⁻⁵ moles of aspartame.

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Answer: B:Light moves in a straight line except at surfaces between different transparent materials, where its path bends.

Explanation:

The empirical and molecular formula of benzene is CH and C6H6 that contains only carbon and hydrogen and the mass of hydrogen is 7.74%.

Molar mass of benzene is = 78.1%

Hydrogen = 7.44%

We have to find empirical and molecular formula

We calculate the percentage of Carbon in the compound is as follow:

Percentage of compound = 100%

Hydrogen = 7.44%

We have find the percentage of carbon

Carbon = (Percentage of compound) - (Hydrogen)

= 100-7.44

= 92.56%

Calculate empirical formula:

Carbon (C) = 92.56%  Hydrogen (H) = 7.44% Empirical formula = ?

Firstly, divide by their molar mass

C = 92.56 / 12 = 7.71, H = 7.44 / 1 = 7.44

Divide by the smallest

C = 7.71 / 7.74 = 1, H = 7.44 / 7.44 = 1

Empirical formula of benzene = CH

Calculate Molecular formula

Molecular mass of benzene = 78.1 g / mol. Empirical formula = CH, Molecular formula = ?

Molecular formula = Empirical formula  X n

Molecular formula = molar mass

Therefore, Empirical formula x n = molar mass

[CH]n = 78.1, [12 + 1]n = 78.1,

13n = 78.1

Divide both sides by 13

n = 78.1 / 13

n = 6

Molecular formula = C6H6

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The reactivity of the metals as we go across in the period or  from the left to the right horizontally in the periodic table it will decreases.

The reactivity of the metals as we move across the period from left to right in the periodic table it will decreases. the reactivity of the metals as we move in the group from top to the bottom in the periodic table it will increases due the increase in the size of the elements from top to bottom.

Thus, the reactivity of the metals decreases as we move across period from left to the right in the periodic table.

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Answer:

c

Explanation:

valence is the number of electrons in the outer most she'll.. therefore all elements in the same group have the same valences for example group one elements have a valence of one

I hope this helps

Answer:

40.72g of sulfuric acid are needed

Explanation:

When sulfuric acid, H₂SO₄, is neutralized by lead (IV) hydroxide, Pb(OH)₄, Lead (IV) sulfate, Pb(SO₄)₂ and water as follows:

2 H₂SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O

To solve this question we must find the moles of 57.18g of Pb(SO₄)₂. As 2 moles of H₂SO₄ produce 1mol Pb(SO₄)₂ we can find the moles of H₂SO₄ and its mass as follows:

Moles Pb(SO₄)₂ -Molar mass: 275.23 g/mol-

57.18g * (1mol / 275.23g) = 0.2078 moles Pb(SO₄)₂

Moles H₂SO₄:

0.2078 moles Pb(SO₄)₂ * (2mol H₂SO₄ / 1mol Pb(SO₄)₂) = 0.4155 moles H₂SO₄

Mass H₂SO₄ -Molar mass: 98g/mol-

0.4155 moles H₂SO₄ * (98g / mol) =

The element with electronic configuration 2s1, which is lithium, has a violent reaction with cold water.

The most reactive metals in the periodic table are the alkali metals (Li, Na, K, Rb, Cs, and Fr); they all react with cold water violently or even explosively, displacing hydrogen. In the reduction of water to hydrogen gas (H2) and the metal ion hydroxide (OH), Group 1 Metal (M) is oxidised to its metal ions.

The second most reactive metals in the periodic table are the alkaline earth metals (Be, Mg, Ca, Sr, Ba, and Ra), which also exhibit increased reactivity in higher periods like the Group 1 metals. The only alkaline earth metal that does not react with water or steam, even when heated to a high temperature, is beryllium (Be).  Furthermore, beryllium has an exterior oxide layer that is robust, which reduces its reactivity at lower temperatures.

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Answer:

1.5 moles

Explanation:

The equation of the reaction is given as:

2 MnO2 + 4 KOH + O2 --> 2KMnO 4 + 2KOH + H2

From the equation,

2 moles of MnO2 produces 2 moles of KMnO4

x moles of MnO2 would produce 1.5 moles of KMnO4

2 = 2

x = 1.5

Solving for x;

x = 1.5 * 2 / 2

x = 1.5 moles

Answer:

Chemical Compound

Explanation:

I'm not sure why but I know it's chemical. Hope this helps!