Regarding the formula AI2O3 which of the following is accurate

Answer:

electrons move around the nucleus in fixed orbits of equal amounts of energy

Explanation:

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option B.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

According to Bohr’s atomic model,  electrons move around the nucleus in fixed orbits of increasing levels of energy.

Therefore, the correct option is option B that is electrons move around the nucleus in fixed orbits of increasing levels of energy.

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Answer:

Explanation:

[tex]P_1=0.492\:atm\\V_1 = 45.8\:ml\\V_2 = ?\\P_1 = 0.954\:atm\\\\Boyle's Law = P_1V_1 = P_2V_2\\\\Lets \:make\: V \:subject\:of\:the\:formula\\\\\frac{P_1V_1}{P_2} = \frac{P_2V_2}{P_2} \\ \\V_2 =\frac{P_1V_1}{P_2} \\V_2 = \frac{0.492\times45.8}{0.954}\\ \\V_2 = \frac{22.5336}{0.954} \\\\V_2 = 23.620\\\\V_2 = 23.6[/tex]

Answer:

A carbon–carbon bond is a covalent bond between two carbon atoms.

Explanation:

Answer:

3-Methylhex-2-ene  

Explanation:

You count the atoms in the stems of the names and add them up.

C. 3-Methylhex-2-ene

           Methyl = 1C

         Hexene = 6C

Methylhexene = 7C

A. 2-Methylhept-1-yne is wrong. It has 1C + 7C = 8C

B. 2-Methylpropane is wrong. It has     1C + 3C = 4C

D. 3-Methylpent-1-ene is wrong. It has 1C + 5C = 6C

Answer:

C: a nucleic acid

Explanation:

The function of nucleic acids is to store and express genetic information. Since fragments of DNA called genes encode the information to produce certain proteins, they are classified as nucleic acids.

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Answer:

A) Molecule A: Fatty acid

Molecule B: Glycerol

B) 3 molecules of molecule A(fatty acid) normally combine with one molecule of B (glycerol) to form a single fat molecule

Explanation:

QUESTION A:

Fats/lipids are one of the four major biomolecules in living systems. They are polymers, and like any polymer, they are made up of monomeric units which serve as building blocks. In the case of fats/lipids, fatty acids and glycerol are the two major building blocks.

Fatty acids are biological compounds made up of a hydrocarbon chain with a terminal carboxyll group (-COOH), which confers its acidic properties upon it. Hence, based on the structural diagram of molecule A in the attached image, it can be observed that the functional group is a carboxyll group. Therefore, molecule A is a FATTY ACID.

Glycerol is a compound with more than one hydroxyll group (-OH) in its chemical structure. It has the chemical formula; C3H8O3 with three hydroxyll groups attached to each of the carbon atoms. Therefore, as observed in the image, molecule B is a GLYCEROL because it contains 3 hydroxyll groups.

QUESTION B:

In the chemical structure of a fat molecule, three fatty acids are attached to each of the three carbon atoms of the glycerol molecule. This is done through the process of esterification i.e. combination of carboxyll group with hydroxyll group. Due to the fact that it takes 3 molecules of fatty acids to combine with one molecule of glycerol, fats are referred to as triglycerides.

Answer:

because moles is the chemical unit*Avogadro's number, meaning it's the amount of atoms in the given unit.

Explanation:

The analogy that forms the basis of the octet rule compares covalent valence electron arrangements to orbital overlap electron densities.

An atomic orbital is a function that describes the position and wave-like activity of an electron in an atom in terms of both atomic theory and quantum mechanics.

This function may be used to determine the likelihood of discovering any atom's electron in any certain area surrounding the nucleus.

The nucleus is the center of the orbits. One orbital will be larger than the others if an atom has several orbitals, or they will overlap. Additionally, an electron is most likely to be found in the orbitals.

An atomic Orbitals are centred around the nucleus. If an atom has many orbitals, either one orbital is bigger than the others or they overlap.

Thus, option B is correct.

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this compound is called 2-propanamine 2 indicates the position of the amino group propan- indicates the radical (joy123333 do they make anyone a mod?)

Answer:

P.A.S.S

pull, aim, squeeze, sweep.

hope this answer correct (^^)..

Answer:

The proper way of using an extinguisher is:

pull, aim, squeeze and sweep.

Explanation:

P-pull

A-aim

S-squeeze

S-sweep

You can always use this to remember, okay.

Hope it helps.

Answer:

        we need to look at what actually happens to reactant molecules during a chemical. in order for the reaction to take place , some or all of the chemical bonds in the reactants must be broken so that the new bonds, those of the products , can form.

Answer:

Graph 3

Explanation:

got it right.

Explanation:

warm honey easier to pour than cold honey due to Increasing the temperature converts the sugars into water, which flows easier.

Honey contains sugar,  water  and other ingredients, where Sugar gives  gives sweetness, water maintain fluidity, and other components are present in a least amount and the differences are the color, aroma and taste.

Three types of sugar such as fructose (41%), grape sugar  or glucose about 34%  and sucrose contain 1 and 2%, other components include  minerals, proteins, acids and undetermined matter.

Minerals constitute 3.68%, increase the value of honey for human consumption and the most common minerals are potassium, chlorine, sulfur, calcium, sodium, phosphorus, magnesium, silicon, iron, manganese and copper.

Proteins are collected from nectar and pollen  which is the integral parts of plants, acids are also the component,  vitamn C and some B complex vitamins  such as riboflavin, pantothenic acid, pyridoxine, biotin, nicotinic acid are present.

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Answer:

C

Explanation:

I am not 100% sure tho correct me if I'm wrong pls:/

Answer:

Enthalpy change = -98.6kJ

Explanation:

Based on the reaction:

2SO₂(g) + O₂(g) ⟶ 2SO₃(g), △H = -198 kJ

When 2 moles of SO₂ (Molar mass: 64.066g/mol) reacts with 1 mole of oxygen, enthalpy change is -198kJ

To know enthalpy change of 58.0g of SO₂ with excess oxygen we need to calculate moles of SO₂ thus:

58.0g SO₂ ₓ (1mol / 64.066g) = 0.905 moles SO₂

If 2 moles of SO₂ produce an enthalpy change of -198kJ, 0.905 moles SO₂ will produce:

0.905 moles SO₂ ₓ (-198kJ / 2 moles SO₂) =

Enthalpy change = -98.6kJ

Answer:

b

Explanation:

39.98, 153.5 mL volume of gas is measured at 71.1°C

Answer:

mass = (a) 1290

Explanation:

as 2 moles of nitric acid gives one mole of of magnesium nitrate . we should divide the number of moles of of nitric acid by 2 .

Then apply the formula:

number of moles= mass/molar ratio

thanks

Answer:

option c

Explanation:

Rate = k(A)¹(B)²

Answer:

c

Explanation:

a p e xxxxxxxxx

Answer:

68.9 g of KCN.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

KCN + HCl → KCl + HCN

From the balanced equation above,

1 mole of KCN reacted with 1 mole of HCl.

Next, determination of the number of mole of KCN needed to react with 1.06 moles HCl.

This is illustrated below:

From the balanced equation above,

1 mole of KCN reacted with 1 mole of HCl.

Therefore, 1.06 moles of KCN will also react with 1.06 moles of HCl.

Finally, we shall convert 1.06 moles of KCN to grams.

This can be obtained as follow:

Molar mass of KCN = 39 + 12 + 14 = 65 g/mol.

Mole of KCN = 1.06 moles

Mass of KCN =...?

Mole = mass /Molar mass

1.06 = mass of KCN / 65

Cross multiply

Mass of KCN = 1.06 x 65

Mass of KCN = 68.9 g

Therefore, 68.9 g of KCN is needed to react with 1.06 moles of HCl.

Answer:

kl

Explanation:

According to the concept of solubility and electrolysis , KI would form an electrolytic solution in water.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

the answer is 70.906 g/mol

Explanation:

Answer:

214.12 g

Explanation:

mass = no. of moles x molar mass

molar mass of Cl2 = atomic mass of Cl x 2

= 35.453 x 2

=70.906

so the mass of 3.02 mol Cl2 = 3.02 x 70.906

=214.12 g

Answer: D. Water changes from a gas to a solid to a liquid.

Explanation:

Wat

According to the phase diagram for [tex]H_{2}O[/tex] water changes from a solid to a gas to a liquid at 1 atm pressure as the temperature is increased from -10 degree Celsius to 110 degree Celsius.

The phase diagram of water system comprises graphical representation of various phase. The slope of line connecting the solid state and liquid states is -ve (negative) rather than +ve (positive).

Water is an unusual substance in solid state is less denser in its liquid state. In liquid state of water ice floats.

Here, the phase of water changes from a solid to a gas to a liquid.

Thus, from above conclusion we can say that water changes from a solid to a gas to a liquid at 1 atm pressure as the temperature is increased from -10 degree Celsius to 110 degree Celsius.

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Answer:

pKb = 10.96

Explanation:

Tartaric acid is a dyprotic acid. It reacts to water like this:

H₂Tart  +  H₂O  ⇄  H₃O⁺   +  HTart⁻         Ka1

HTart⁻  +  H₂O  ⇄  H₃O⁺   +  Tart⁻²           Ka2

When we anaylse the base, we have

Tart⁻²   +  H₂O  ⇄  OH⁻  +  HTart⁻       Kb1

HTart⁻  +  H₂O  ⇄  OH⁻  +    H₂Tart          Kb2

Remember that Ka1 . Kb2  = Kw, plus pKa1 + pKb2 = 14

Kb2 = Kw / Ka1  →   1×10⁻¹⁴ / 9.20×10⁻⁴  = 1.08×10⁻¹¹

so pKb = - log Kb2   → - log 1.08×10⁻¹¹ = 10.96  

Answer:

The charge - 1

Because the charge of proton is + and electron -

Charge = +49 +(-50)

= - 1

Explanation:

Answer:

Option C. Energy Profile D

Explanation:

Data obtained from the question include:

Enthalpy change ΔH = 89.4 KJ/mol.

Enthalpy change (ΔH) is simply defined as the difference between the heat of product (Hp) and the heat of reactant (Hr). Mathematically, it is expressed as:

Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)

ΔH = Hp – Hr

Note: If the enthalpy change (ΔH) is positive, it means that the product has a higher heat content than the reactant.

If the enthalpy change (ΔH) is negative, it means that the reactant has a higher heat content than the product.

Now, considering the question given, the enthalpy change (ΔH) is 89.4 KJ/mol and it is a positive number indicating that the heat content of the product is higher than the heat content of the reactant.

Therefore, Energy Profile D satisfy the enthalpy change (ΔH) for the formation of CS2 as it indicates that the heat content of product is higher than the heat content of the reactant.

Answer:

C. colloid

Explanation:

Smoke is a collection of tiny solid, liquid and gas particles. Although smoke can contain hundreds of different chemicals and fumes, visible smoke is mostly carbon (soot), tar, oils and ash. Smoke is a collection of tiny solid, liquid and gas particles.

Answer:

C. Colloid

Explanation:

Edmentum/Plato (just took the test its 100% correct)

Answer:

15

Explanation:

Answer:

2

Explanation: