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14. An element that emits energy by nuclear decay is

A. radioactive.

B. an ion.

C. an anion.

D. a cation.

52.6g and 23.8mL necessary 100mL of a solution that is simultaneously 15.6 mg/mL malonic acid, 3.38 mg/mL MnSO4 • H2O, and 0.03% starch to make this solution.

What is malonic acid?

The chemical formula of malonic acid is CH2(COOH)2. Malonates include the ionized form of malonic acid as well as its esters and salts. Because it interferes with respiration, malonic acid is extremely harmful, especially in cases of cancer and other degenerative disorders (the making of ATP in mitochondria). Malonic acid is a somewhat unstable substance with limited practical uses. Beetroot contains its calcium salt, however the acid itself is often made by hydrolyzing diethyl malonate.

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The required balanced chemical equation CH₄ + 2O₂ = CO₂ + 2H₂0

Combustion is a chemical reaction between a fuel and an oxidant that produces an oxidized product.

Usually, its a reaction between a hydrocarbon and oxygen to yield carbon dioxide, water, and heat.

Hydrocarbon + Oxygen = Carbon Dioxide + Water + Heat

Balanced chemical equation is CH₄ + 2O₂ = CO₂ + 2H₂0

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The percent of C in Ca(C2H3O2)2 is 27.28%.

The formula mass of Ca(C2H3O2)2 is 158.17 g/mol.

The percent of H in Ca(C2H3O2)2 is 2.54% and the percent of O is 54.50%.

To find the percent of C in Ca(C2H3O2)2, we first need to calculate the molar mass of the compound:

Molar mass of Ca(C2H3O2)2 = (1 × 40.08) + (2 × (2 × 12.01 + 3 × 1.01 + 2 × 16.00)) = 2 × 158.17 = 316.34 g/mol

Now we can calculate the percent of C:

Mass of C in Ca(C2H3O2)2 = 2 × (2 × 12.01) = 48.04 g/mol

Percent of C in Ca(C2H3O2)2 = (48.04 g/mol ÷ 316.34 g/mol) × 100% = 15.19%

Therefore, the percent of C in Ca(C2H3O2)2 is 15.19%, rounded to the hundredths place.

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Answer:

among these which is not a base is CaSO4

Some types of solids that are insoluble in water are:

Many solids are insoluble in water, meaning they do not dissolve in water to a significant extent. Here are some examples of common solids that are generally insoluble in water:

Metals: Most metals, such as gold, silver, platinum, and copper, are insoluble in water.

Non-Metallic Elements: Many non-metallic elements, such as carbon (in the form of graphite or diamond), sulfur, phosphorus, and iodine, are insoluble in water.

Metal Oxides: Some metal oxides, particularly those of less reactive metals, are insoluble in water. Examples include aluminum oxide (Al2O3), iron(III) oxide (Fe2O3), and lead(II) oxide (PbO).

Metal Carbonates: Most metal carbonates are insoluble in water. Examples include calcium carbonate (CaCO3), lead(II) carbonate (PbCO3), and copper(II) carbonate (CuCO3).

Metal Sulfides: Many metal sulfides are insoluble in water. Examples include lead(II) sulfide (PbS), silver sulfide (Ag2S), and mercury(II) sulfide (HgS).

Insoluble Salts: Certain salts have limited solubility in water. Examples include silver chloride (AgCl), lead(II) iodide (PbI2), and calcium sulfate (CaSO4).

It's important to note that while these solids are generally insoluble in water, they may exhibit some solubility to a small extent. The solubility of a solid in water can vary depending on factors such as temperature, pressure, and the presence of other solutes.

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Answer:

Answer:

Speeds up

Explanation:

The formula for the ionic compound formed from aluminum and selenium is Al₂Se₃.

The compound is formed by the transfer of electrons from aluminum to selenium, resulting in the formation of positively charged Al³⁺ ions and negatively charged Se²⁻ ions. The number of atoms in the resulting compound is determined by the need to balance the charges of the ions. Since aluminum has a +3 charge and selenium has a -2 charge, two aluminum atoms, and three selenium atoms combine to form Al₂Se₃.

I hope this helps! Let me know if you have any further questions.

The diagram representing the ionized state of matter is the plasma state.

2Diagrams of four states of matter

Solid: A solid is a state of matter in which the constituent particles, such as atoms, molecules, or ions, are packed together tightly and firmly held by strong intermolecular forces.

Liquid: A liquid is a state of matter in which the constituent particles, such as atoms, molecules, or ions, are closely packed together but are not held together as strongly as in solids.

Gas: A gas is a state of matter in which the constituent particles, such as atoms, molecules, or ions, are widely separated and are not held together as strongly as in liquids and solids.

Plasma: Plasma is a state of matter in which a gas has been ionized, and it becomes a collection of charged particles such as positive ions and free electrons.

Plasma is a type of ionized gas in which the gas is composed of ions, electrons, and neutral atoms.

Plasma is a state of matter that is similar to a gas in that it has no fixed shape or volume, but unlike gas, it is made up of electrically charged particles.

The electrical charges in plasma are due to the presence of both positive and negative ions.

The most common example of plasma is lightning, and it is also present in fluorescent lights, neon signs, and plasma TVs.

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Answer:

the importance of the periodic table are,

To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.

Explanation:

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Answer:

I think its C

Explanation:

Answer:

When a high- and a low-pressure air mass are far apart,  air moves slowly from high to low pressure.

Explanation:

k12

Answer:

pH = 2.10

Explanation:

We name an acid as diprotic because it can release two protons:

H₂A  +  H₂O  ⇄  H₃O⁺   + HA⁻     Ka₁

HA⁻  +  H₂O  ⇄  H₃O⁺   + A⁻²      Ka₂

We propose the mass balance:

Analytical concentration = [H₂A] +  [HA⁻]  + [A⁻²]

As Ka₂ is so small, we avoid the [A⁻²] so:

0.18 M = [H₂A] +  [HA⁻]

But we can not avoid the HA⁻, because the Ka₁. Ka₁'s expression is:

Ka₁ = [H₃O⁺] . [HA⁻] / [H₂A]

We propose the charge balance:

[H₃O⁺] = [HA⁻] + [A⁻²] + [OH⁻]

As we did not consider the A⁻², we can miss the term and if

Kw = H⁺ . OH⁻

We replace Kw/H⁺ = OH⁻. So the new equation is:

[H₃O⁺] = [HA⁻] + Kw / [H₃O⁺]

The acid is so concentrated, so we can avoid the term with the Kw, so:

[H₃O⁺] = [HA⁻]

In the mass balance we would have:

0.18 M = [H₂A]

We replace at Ka₁

Ka₁ = [H₃O⁺] . [HA⁻] / [H₂A]

Ka1 . 0.18 / [H₃O⁺] = [HA⁻]

We replace at the charge balance:

[H₃O⁺] = Ka1 . 0.18 / [H₃O⁺]

[H₃O⁺]² = 3.4×10⁻⁴  . 0.18

[H₃O⁺] = √(3.4×10⁻⁴  . 0.18)

[H₃O⁺] = 7.82×10⁻³

- log [H₃O⁺] = pH → - log 7.82×10⁻³

pH = 2.10

Following are the calculation to the pH:

For First ionization:

\([H^+] = (K_{a1} \times C)^{\frac{1}{2}}\)

where

C = initial concentration of acid \(= 0.18\ M\)

\([H^{+}] = (3.4 \times 10^{-4} \times 0.18 \ M)^{\frac{1}{2}}\\\)

\([H^{+}] = 0.007\ M\)

For Second ionization:

\([H^{+}] = K_{a2} \\\\\)

\([ H^{+} ] = 6.7 \times 10^{-9}\ M \\\)

\(Total [H^{+}] = 0.007\ M + 6.7 \times 10^{-9}\ M\\\\Total [H^{+}] = 0.007 \ M\)

\(pH = -\log[H^+] \\\\pH = -\log(0.007 \ M)\\\\pH = 2.15\)

Therefore, the pH is "2.15".

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The pressure of the chlorine gas at the given condition is 1.7 atm.

The pressure of the chlorine gas at the given condition is calculated by applying ideal gas law.

PV = nRT

where;

The number of moles of 25 g of chlorine is calculated as follows;

n = m/M

n = 25/71

n = 0.352

The pressure of the chlorine gas at the given condition is calculated as;

P = nRT/V

P = (0.352 x 0.0821 x 263) / (4.5)

P = 1.7 atm

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Answer: A. there must be a change in chemical properties  

Explanation:

Answer:

B. 3

Explanation:

To decrease the temperature of your coffee from 85°C to 55°C your system need to absorb energy. This energy will be absorbed from the addition of some ice.

How many energy must be absorbed? You can use:

Q = C×m×ΔT

Where Q is heat (Energy), C is specific heat of your solution (4.184J/g°C), m is its mass (mass of 355mL of coffee = 355g) and ΔT is change in temperature (85°C-55°C = 30°C)

Replacing, your ice needs to absorb:

Q = C×m×ΔT

Q = 4.184J/g°C×355g×30°C

Q = 44559.6J

The energy that is taken from an ice cube to change its temperature from -15°C to 55°C is:

Energy from -15°C to 0°C (C of ice = 2.95J/g°C):

Q = C×m×ΔT

Q = 2.95J/g°C×24g×15°C

Q = 1062J

Now the energy taken to pass the ice from solid to liquid is:

Q = ΔHf×m

Q = 334J/g×24g

Q = 8016J

And the energy to increase the temperature of 0°C to 55°C of 24g of ice:

Q = 4.184J/g°C×24g×55°C

Q = 5522.9J

And the total energy that 1 ice cube needs is:

Q = 1062J + 8016J + 5522.9J

Q = 14600.9J

But you need 44559.6J to decrease the temperature of your coffee, that is:

44600J / 14600.9J = 3.05

≈ 3 ice cubes to decrease the temperature of the coffee.

Right solution:

Answer:

3

Explanation:

I’m not positive but I think it’s correct

The  two half cells are : Fe³⁺   +  e⁻    ---->  Fe²⁺

                                      Cu²⁺  +  2e⁻  ---> Cu

The standard electrode potential E° cell = 0.43 V

The overall reaction is given as :

Fe³⁺   +   Cu  ----->  Cu²⁺   +   Fe²⁺

The  two half cells are : Fe³⁺   +  e⁻    ---->  Fe²⁺     E° = 0.77 V

                                      Cu²⁺  +  2e⁻  ---> Cu             E° = 0.34 V

                                       Cu  ---->    Cu²⁺  +  2e⁻      E° = - 0.34 V

The standard electrode potential E° cell = 0.77 V + (-0.34 V)

                                                                    = 0.43 V

Thus, The  two half cells are : Fe³⁺   +  e⁻    ---->  Fe²⁺

                                      Cu²⁺  +  2e⁻  ---> Cu

The standard electrode potential E° cell = 0.43 V

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Answer:

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.Explanation:have a good day :P

Answer:

18

Explanation:

**Subscripts represent atoms in chemical formulas

The subscript in glucose is 6, and multiply the 6 by the 2 subscript in the other oxygen reactant and then added to get a total of 18 atoms

6 + 6(2) = 6 + 12 = 18

From the calculations, the concentration of the acid is 0.24 M.

The term neutralization has to do with a reaction in which an acid and a base react to form salt and water only.

We have to use the formula;

CAVA/CBVB = NA/NB

CAVANB =CBVBNA

The equation of the reaction is; 2NaOH + H2SO4 ----> Na2SO4 + 2H2O

CA = ?

CB = 1.2 M

VA =  50 mL

VB = 20 mL

NA = 1

NB = 2

CA = CBVBNA/VANB

CA = 1.2 M * 20 mL * 1/ 50 mL * 2

CA = 0.24 M

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Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer:

the liquid becomes equal to the rate of condensation

Explanation:

ive come across this question before! and i think its right! :D

The vapor pressure of a liquid at a provided temperature is measured when the rate of evaporation of a liquid evolves equally to the rate of condensation.

Evaporation is the procedure by which water transforms from a liquid to a gas or vapor.

Evaporation is the primary route that water moves from the liquid circumstances around into the water cycle as atmospheric water vapor.

When a molecule around the surface absorbs adequate energy to overwhelm the vapor pressure, it will exit and join the surrounding air as a gas.

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Answer:

Explanation:

Propionic acid  has chemical formula of  C₃H₆O₂ , and smells somewhat unpleasant (like body odour).

Answer:

Economy is always at the full employment level of output

Explanation:

The economy in a classical long-run supply model will always have the same economic output

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer: Under what condition an object having density greater than water will float on water?

If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.

Answer:

C.) protons and neutrons

Explanation:

Most atoms contain proton(s), neutron(s), and electron(s). Within the nucleus of an atom, there are protons and neutrons. Electrons are located outside of the nucleus.

a)CH3-CH2-CH2-CH=CH2

b)CH3-CH2-CH2-CH2-CH2-CH2-CH3

c)CH≡C-CH2-CH2-CH2-CH3

d)CH3-CH2-CH2-CH2-CH2-CH2-CH=CH2

e)CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3

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Carbon atoms may thus form bonds to as many as four other atoms. For example, in methane (CH 4​start subscript, 4, end subscript), carbon forms covalent bonds with four hydrogen atoms

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