1) According to the table, what was the temperature change from start to finish of each material? Styrofoam- metal- paper- plastic-

Answer:

B

Explanation:

the reaction is endothermic because of the temperature drop and the enthralpy is negative because its an endothermic reaction.

I did some research so I believe this to be correct but if its no I'm sorry

HCl molecules are info will arise between a molecule of hydrochloric acid HCl and a molecule of propanol ch3ch2oh, both in liquid stages

HCl molecules, for instance, have a dipole second due to the fact the hydrogen atom has a slightly tremendous rate and the chlorine atom has a slightly bad fee. because of the force of enchantment between oppositely charged particles, there may be a small dipole-dipole force of appeal among adjoining HCl molecules.

An intermolecular force is a pressure that mediates the interaction between molecules, together with the electromagnetic forces of appeal or repulsion which act among atoms and other types of neighboring debris, e.g. atoms or ions.

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When a solid melts, the molecules move more quickly because there are fewer inter molecular attractive forces and more inter molecular gaps.

A solid's temperature will rise when heat is added to it until the melting point is reached. The solid will then turn into a liquid with further heating without changing temperature. Additional heat will boost the temperature of the liquid once all of the solid has melted.

The molecules of a solid vibrate more rapidly and gain energy when it is heated. They reach a point where they start to separate from one another after overcoming the inter molecular force of attraction. Solids melt as a result of this.

Particles in a solid are arranged in a regular pattern and are closely packed together. Solids have set shapes that are challenging to disassemble because individual particles lack the energy to do so. Solids always have a consistent lattice structure.

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This chemical is known as lead (II) nitrate. It is an ionic assembly (salt compound) comprised of lead cations in the +2 oxidation state. With regard to the naming convention, each lead (II) cation is paired with two nitrate anions, each having a charge of -1.

Chemical nomenclature is a set of principles for naming chemical substances in a systematic manner. The International Union of Pure and Applied Chemistry designed and developed the most widely used nomenclature in the world (IUPAC).

The basic goal of chemical nomenclature is to guarantee that no ambiguity exists between a spoken or written chemical name and the chemical compound to which the name refers. Each chemical name should only relate to one substance.

It is required to indicate the charge of these cations or compounds containing these cations when identifying them. Ionic compounds are formed when cations and anions interact. The cation of an ionic compound is named first, followed by the anion. When writing their chemical formulae, they use the same format.

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To be an effective disinfectant, bleach needs to contain chlorine bleach as its active ingredient. Chlorine bleach works by breaking down the proteins, enzymes, and other molecules inside bacteria and viruses, ultimately killing them.

Other ingredients such as perm solution, ointments, or foaming agents are not necessary for bleach to effectively disinfect surfaces. It is important to use bleach according to the instructions on the label, as it can be dangerous if not used properly. Additionally, bleach should not be mixed with other cleaning products, as this can create toxic fumes.

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Answer:

Neutralization reaction

Explanation:

It is a reaction between an acid and a base

The simple cubic unit cell of gallium contains 8 atoms.

Atoms are the fundamental units of matter, consisting of an electrically neutral nucleus with positively charged protons and electrons surrounding it. With sizes ranging from 0.1 to 0.5 nanometers (10-10 to 5x10-10 meters), atoms are very tiny.

We must first estimate the edge length of the unit cell in order to calculate the number of atoms in the simple cubic unit cell of gallium.

Since mass per unit volume is the definition of density (p), we can apply the following equation:

ρ = m / V

where V is the unit cell's volume and m is the unit cell's mass. To find V, we can rearrange this equation as follows:

V = m / ρ

When we enter the provided values, we obtain:

V = 69.72 g/mol / 5.91 g/cm3, which equals 11.8 cm3/mol.

The volume of the unit cell is easily determined because the simple cubic unit cell is made up of a single cube:

A³ = Vcell

where an is the cube's edge length. To solve for a, we obtain:

a=(Vcell)^(1/3)

  =(11.8 cm³/mol)^(1/3)

   = 2.39 cm.

A sphere with a radius of approximately 1 angstrom (1 A = 10^-8 cm) can be used to represent the volume of an atom. We can accommodate multiple atoms along each of the unit cell's 2.39 cm long edges. The number of atoms per edge is specifically determined by:

n = 2.39 cm / (2 × 1 Å) = 2.39 × 10^(-8) cm / Å

The total number of atoms in the unit cell, however, is equal to the number of corners because the unit cell only contains atoms at the corners. There is one atom at each of the eight corners of a basic cubic unit cell, for a total of:

8 atoms per cell = natom

In light of this, the simple cubic unit cell of gallium contains 8 atoms.

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Answer:

Explanation:

a )

PbS      +     2PbO   →     3Pb    +     SO₂

                  2 mole       3 moles       1 moles

b )

2 moles of PbO is required to produce 3 moles of Pb

17 moles of PbO is required to produce 3/2 x 17 moles of Pb

= 3/2 x 17 moles of Pb

= 25.5 moles of Pb .

c )

1 mole of  SO₂ needs 2 moles of PbO

27.3 mole of  SO₂ needs 2 x 27.3  moles of PbO

PbO needed = 2 x 27.3 moles

= 54.6 moles .

d )

PbS      +     2PbO   →     3Pb    +     SO₂

1 mole       2 mole    

1 mole  of  PbS requires 2 moles of PbO

17.6 mole  of  PbS requires 2 x 17.6  moles of PbO

PbO required = 2 x 17.6 moles

= 35.2 moles .

PbO available = 36 moles . So PbO is in excess .

Hence PbS is the limiting reagent .

Answer:

The amount of energy transferred to the diamond while being cut is thus  Q = 852000 J

Explanation:

Since quantity of heat transferred Q = mcΔθ where m = mass of substance , c = specific heat capacity of substance and Δθ = temperature change.

Now, given that for diamond, m = mass of diamond = 600 g, c = specific heat capacity of diamond = 710 J/g°C and Δθ = temperature change = 2 °C.

So, the amount of energy transferred to the diamond while being cut is thus

Q = mcΔθ

Q = 600 g × 710 J/g°C × 2 °C

Q = 852000 J

So, the amount of energy transferred to the diamond while being cut is thus  Q = 852000 J

when the formula unit of magnesium sulfide, mgs is separaiinto magnesium and sulfur particles, the particles are called Ions.

The bond that make magnesium and sulphur together is ionic bond. Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, and is the primary interaction occurring in ionic compounds.

since, the bond between magnesium and sulphur is ionic bond, if we separate them, then they are just called ions ( Mg2+ and S2-).

An ion is an atom or group of atoms in which the number of electron s is different from the number of proton s.

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Answer: pretty sure its 0.214 moles * 40.3g/mole = 8.6g (2 sig figs) of MgO, and

0.035 moles * 40.3g/mole = 1.4g of MgO

Explanation:

Answer:

m=28.8g

Explanation:

m=dv

m=24*1.2

m=28.8g

Answer:

B. X represents phosphorus

Explanation:

In an isotope symbol, you write the mass number above the atomic number. So the 31 represents the mass of the protons and neutrons of the element added together, and the 15 represents the atomic number or the total number of protons in the nucleus.

Answer:

what

Explanation:

Answer:

it is where the ozone layer is locate which is affected by human activities

The molar solubility of silver arsenate in pure water at 25°C is:

S = (1.0 x 10^-22 / [AsO4^3-])^(1/3)

The molar solubility of silver arsenate in 0.10 M AgNO3 is:

S = 4.22 x 10^-7 M

(a) Molar solubility of silver arsenate in pure water at 25°C can be calculated using the solubility product constant Kp and the expression:

Ag3AsO4(s) = Ag+ (aq) + AsO4^3- (aq)

Kp = [Ag+]^3 [AsO4^3-]

Rearranging, we have:

[Ag+]^3 = Kp / [AsO4^3-]

Taking the cube root of both sides:

[Ag+] = (Kp / [AsO4^3-])^(1/3)

Since Kp = 1.0 x 10^-22, we have:

[Ag+] = (1.0 x 10^-22 / [AsO4^3-])^(1/3)

Since the molar solubility is equal to the concentration of Ag+ ions, the molar solubility of silver arsenate in pure water at 25°C is:

S = (1.0 x 10^-22 / [AsO4^3-])^(1/3)

(b) To calculate the molar solubility of silver arsenate in 0.10 M AgNO3, we need to use the common ion effect. The presence of AgNO3 will increase the concentration of Ag+ ions in the solution and thus decrease the solubility of silver arsenate.

The solubility product constant equation can be written as:

Kp = [Ag+]^3 [AsO4^3-] = S^3 * [AsO4^3-]

Rearranging, we have:

S^3 = Kp / [AsO4^3-]

Since Kp = 1.0 x 10^-22 and [AsO4^3-] = S, we have:

S^3 = 1.0 x 10^-22 / S

S^4 = 1.0 x 10^-22

S = (1.0 x 10^-22)^(1/4) = 7.07 x 10^-6 M

However, this is the solubility in pure water. In 0.10 M AgNO3, the concentration of Ag+ ions is 0.10 M. So, we need to use the equation:

Ksp = [Ag+]^3 [AsO4^3-] = (0.10 + S)^3 S

Rearranging, we have:

S^3 = Ksp / (0.10 + S)^3

Substituting Ksp = 1.0 x 10^-22, we have:

S^3 = 1.0 x 10^-22 / (0.10 + S)^3

Solving for S, we obtain the molar solubility of silver arsenate in 0.10 M AgNO3 as:

S = 4.22 x 10^-7 M

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Thus, the molarity of the diluted acetic acid solution is 5.0 M.

To determine the molarity of the acetic acid solution, we first need to calculate the number of moles of acetic acid present in the 60.0 g sample, and then divide this by the volume of the solution.
1. Calculate moles of acetic acid:
Moles = mass / molar mass
Moles = 60.0 g / 60 g/mol
Moles = 1.0 mol
2. Convert the volume of the solution to liters:
200.0 mL = 0.2 L
3. Calculate the molarity of the solution:
Molarity = moles / volume
Molarity = 1.0 mol / 0.2 L
Molarity = 5.0 M
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If magnesium nitrate and sodium hydroxide are reacted together the product formed are magnesium hydroxide and sodium nitrate.

Sodium nitrate is the chemical compound having the formula NaNO₃. This alkali metal nitrate salt is also known as Chile saltpeter to distinguish it from ordinary saltpeter, potassium nitrate. It is used as preservative agents in cured meats such as bacon, sausage and in some cheeses. It appears as a white crystalline solid. It is  Noncombustible but accelerates the burning of combustible materials. It May explode under prolonged exposure to heat or fire. The toxic oxides of nitrogen are produced in fires. It is used in solid propellants, explosives, fertilizers, and for many other uses.

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Answer:

Li + Cl₂

Explanation:

left side of the arrow are reactants and right side of the arrow are products.

The oxidation number and electronegativity are two different concepts in chemistry.

The oxidation number is a number assigned to an element in a chemical compound to indicate the degree of oxidation or reduction of the element. It reflects the charge an element would have if the compound were completely ionic.

Electronegativity is a measure of the ability of an atom in a molecule to attract electrons towards itself. It reflects the strength of an atom's hold on electrons in a covalent bond.

There is a correlation between oxidation number and electronegativity in the sense that elements with high electronegativity tend to have high oxidation numbers. For example, in a compound with a positive oxidation number, the more electronegative element will typically have a higher oxidation number than the less electronegative element. However, this is not a strict rule, as other factors such as the size of the element and the nature of the chemical bond also play a role.

In summary, while there is a relationship between oxidation number and electronegativity, they are two distinct concepts in chemistry with different definitions and applications.

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Answer:

Explanation:

Here, we want to get the equation of reaction between hydrogen and oxygen

When hydrogen and oxygen react with the ration 2 to 1 in terms of number of moles, water is produced (2 moles of water)

We can show that as follows;

When ethyl stearate undergoes hydrolysis, the products would be: ethanol and stearic acid. The correct option is D.

This reaction is a type of chemical reaction that occurs when water reacts with another compound. The hydrolysis reaction of ethyl stearate results in the breakdown of the ester bond of the molecule, which then yields an alcohol and a carboxylic acid as products.

The ester bond in the ethyl stearate is broken by the addition of water molecules, which is facilitated by the presence of an acid or a base. During hydrolysis, the water molecule donates one of its hydrogen atoms to the carboxyl group and the other to the alcohol. This process causes the ester bond to break and the products are produced.

The equation of the hydrolysis reaction of ethyl stearate is given below.

C₁₈H₃₆O₂ (ethyl stearate) + 3H₂O → 2C₂H₅OH (ethanol) + C₁₇H₃₅COOH (stearic acid)

In this equation, ethyl stearate reacts with three water molecules, and it produces two ethanol molecules and one stearic acid molecule. Hence, the answer is option D, i.e., the products would be ethanol and stearic acid.

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Answer: Id answer it but i think your copy and paste got corrupted!

Explanation:

This is a combustion reaction of an alkane with oxygen. It is exothermic (

Δ

H

<

0

), and can be balanced in normal methods for balancing chemical equations ie ensuring that the total number of atoms of each element is the same on both sides of the equation.

Answer:

34.429%

Explanation:

Answer:

d = 1.76 g/cm^3

Explanation:

d = m/v

d = 8.8g/5cm^3

d = 1.76 g/cm^3