Which Of the following compounds is an electrolyte?
a)rubbing alcohol
b)sugar
c)silicon dioxide
d)sodium hydroxide

The radiations are released in the radioactive decay along with the heat energy. Thus, option A is correct.

The radioactive atoms are given as the one that has the presence of unstable nuclei. The unstable nuclei have been giving off radiations that form them to attain stability.

The radioactive atoms have been emitting the radiations from the nucleus to become stable, and the nuclear or the radioactive radiations from the radioactive decay.

The decay of the radioactive elements releases the radiations such as alpha, beta, gamma, and other radiations. The decay along with the release of the radiation releases energy.

Therefore, in radioactive decay, the atoms along with the radiations release heat energy. Thus, option A is correct.

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The element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4 is Tin (Sn). This is found by adding up the electrons in each part of the configuration.

The electron configuration provided, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4, represents the element Sn, or Tin in the periodic table. The configuration corresponds to the distribution of electrons among different energy levels (shells) and sub-levels in an atom. To identify the element, we add up the electrons represented by each part of the configuration (e.g., s2 implies 2 electrons, p6 implies 6 electrons etc.). We see that the total number of electrons is 50, which corresponds to the atomic number of Tin (Sn) in the periodic table.

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The answer is false.

Within the extracellular fluid (ECF), the major cation is sodium (Na⁺) while the major cation in the intracellular fluid is potassium (K⁺). Sodium-potassium pump, is a solute pump that pumps three sodium ions out of the cell in exchange for two potassium ions pumped in the cell, both against their concentration gradients.These electrolytes play an important role in maintaining homeostasis. The ECF, in particular the interstitial fluid, is surrounding all of the cells in the body and therefore is crucial for their normal functions. The ECF is maintained by a number of homeostatic mechanisms including regulation of sodium concentration.

the answer is 9. took the test and got it correct

The answer is C. Subduction

Answer:

A: They evaporate

Explanation:

Where do the OH- ions go as additional acid is added? They evaporate. They combine with excess H+ ions to form more water. They remain in the solution at the same concentration.

Final answer:

The standard enthalpy change (ΔH°) for the reaction of ammonia with O2 to yield nitric oxide and H2O(g) is calculated using standard enthalpies of formation and is found to be -633.2 kJ.

Explanation:

To calculate the standard enthalpy change (ΔH°) for the reaction of ammonia (NH3) with O2 to yield nitric oxide (NO) and H2O(g), we can use the standard enthalpies of formation (ΔH°f) for the reactants and products. Unfortunately, the provided information contains several elements that are not relevant to this question. Let us use the correct ΔH°f values to find the ΔH° for this reaction. Assuming we have balanced the equation and it is:

4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

The formula to calculate ΔH° is:

ΔH° = [∑ (ΔH°f products) × (moles of product)] - [∑ (ΔH°f reactants) × (moles of reactant)]

Using the values given for ΔH°f:

ΔH°f NH3 = -46.1 kJ/mol
ΔH°f NO = 91.3 kJ/mol
ΔH°f H2O(g) = -241.8 kJ/mol

For the reaction:

ΔH° = [4×91.3 kJ/mol + 6×(-241.8 kJ/mol)] - [4×(-46.1 kJ/mol) + 5×0 kJ/mol]

ΔH° = (365.2 kJ - (-1448.8 kJ)) - (-184.4 kJ + 0 kJ)

ΔH° = -817.6 kJ + 184.4 kJ

ΔH° = -633.2 kJ

Therefore, the standard enthalpy change for the reaction is -633.2 kJ.

Acids and bases are similar in that they conduct electricity in aqueous solutions and both react to form salt and water. Their differences lie in taste, color changes in litmus paper, and pH values where acids have pH lower than 7 and bases have pH greater than 7.

Acids and bases are both types of compounds that chemists often deal with. They are similar in that they both conduct electricity when in aqueous solution and they both react with each other to form salt and water, a reaction known as neutralization. However, they are also distinctly different. The first difference is that acids have a sour taste and can turn blue litmus paper red, while bases have a bitter taste and can turn red litmus paper blue. Additionally, acids tend to have a pH less than 7, whereas bases have a pH greater than 7.

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ck(CH₃COOH) = 0,5 M.

V = 1 L.

Ka = 1,8·10⁻⁵.

pKa = -logKa = 4,75.

pH = 5,675.

Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).
5,675 = 4,75 + log(cs/ck).
log(cs/ck) = 5,675 - 4,75 = 0,925.
cs/ck = 10∧(0,925) = 8,4.

cs = 8,4 · 0,5 M = 4,2 M.

n(CH₃COONa) = 4,2 mol/L · 1 L = 4,2 mol.

The oxidation number of Cu in CuSO₄ is +2 and 0 in Cu, the free elemental form. As the oxidation of Cu decreases from +2 to 0, we are looking at the reduction half-reaction for the given redox reaction:

Cu²⁺ + 2e⁻ → Cu

The correct answer is option B.

Photosynthesis is a chemical process used by plants where solar energy is used to transform carbon dioxide and water into carbohydrates and oxygen.

It is the biochemical process by which plants convert inorganic matter (carbon dioxide and water) into organic matter (sugars), taking advantage of energy from sunlight.

This process constitutes one of the most important biochemical mechanisms on the planet since it involves the manufacture of organic nutrients that store light energy from the Sun.

Therefore, we can conclude that photosynthesis is the process carried out by plants to transform inorganic matter (Carbon dioxide, water and solar energy) into organic substances.

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Answer:

D. 0.29 L

Explanation:

To calculate the required volume, we can convert the concentration of the solution from M to g/L, keeping in mind the molar mass of H₂SO₄, 98 g/mol :

1.25 [tex]\frac{mol}{L}*\frac{98g}{1mol}=[/tex]122.5 g/L

So a concentration of 1.25 M of H₂SO₄ is the same as a concentration of 122.5 g/L.

Finally we divide 36 grams by the concentration:

[tex]\frac{36g}{122.5g/L}[/tex] = 0.29 L

So your answer was correct, it is option D.

To balance the equation for the decomposition of barium chlorate into barium chloride and oxygen, ensure that there are equal numbers of each atom on both sides of the equation. The balanced equation is 2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂.

To balance the chemical equation for the decomposition of barium chlorate into barium chloride and oxygen, we must ensure that the number of each type of atom is the same on both sides of the equation. The formula for barium chlorate is Ba(ClO₃)₂, barium chloride is BaCl₂, and oxygen is O₂ (since oxygen is a diatomic molecule).

The unbalanced equation is as follows:

Ba(ClO₃)₂ → BaCl₂ + O₂

To balance this equation:

The balanced equation is:

2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂

The number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, Al₂(SO₄)₃ are 8.00, 12.00, and 48.00, respectively.

Aluminum: There are 2 aluminum atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 2 x 4.00 = 8.00 moles of aluminum atoms.

Sulfur: There is 1 sulfur atom in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 1 x 4.00 = 12.00 moles of sulfur atoms.

Oxygen: There are 12 oxygen atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 12 x 4.00 = 48.00 moles of oxygen atoms.

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Answer:

Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.

Explanation:

1) In test 1 we are dissolving sodium bicarbonate and here there is no chemical change in the property of sodium bicarbonate if it dissolved so it is a pure physical process.

2) In test 2 we are reacting sodium bicarbonate with vinegar (acetic acid).

The reaction is:

[tex]NaHCO_{3}+CH_{3}COOH--->CH_{3}COONa+H_{2}O+CO_{2}[/tex]

Due to formation of carbon dioxide it fizzes. Thus this is a chemical property of sodium bicarbonate to acts as base.

3) In test 3, we are heating and testing the melting point of sodium bicarbonate, which is again a physical property.

The pressure of the gas increases when its volume is reduced from 4 L to 0.5 L at constant temperature, according to Boyle's Law, which dictates an inverse relationship between volume and pressure for a given amount of gas.

When the volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant, according to Boyle's Law, the pressure of the gas increases. Boyle's Law states that at constant temperature, the volume of a fixed number of moles of a gas is inversely proportional to the pressure applied to it. This means that if you decrease the volume of the gas, the pressure must increase to compensate, assuming the amount of gas does not change.

Therefore, in this case where the volume decreases by a factor of 8 (from 4 L to 0.5 L), the pressure must increase by the same factor, assuming that no gas escapes and the temperature remains constant. It's important to note that these principles assume ideal gas behavior and may not perfectly model real gases under all conditions.

elements is the same group have similar chemical properties

100 g of corn chips has 17.69 calories

1 g of corn chips has 17.69/100 or 0.1769 calories

Therefore, 1 g of tomatoes has 0.1769 x 10⁻³ kilocalories

100 g of corn chips has 518 calories

1 g of corn chips has 518/100 or 5.18 calories

Therefore, 1 g of corn chips has 5.18 x 10⁻³ kilocalories

A. A catalyst!!!

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