Chemical reactions can be detected by changes in

Answers

Answer 1

Answer: Chemical reactions can be detected by some of these changes:
1. change of color
2. formation of a solid
3. formation of gas
4. exchange of heat with surroundings

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In liquid water, an equilibrium exists between H2O(ℓ) molecules, H+(aq) ions, and OH−(aq) ions. A person experiencing acid indigestion after drinking tomato juice can ingest milk of magnesia to reduce the acidity of the stomach contents. Tomato juice has a pH value of 4. Milk of magnesia, a mixture of magnesium hydroxide and water, has a pH value of 10.Complete the equation in your answer booklet for the equilibrium that exists in liquid water.

Answers

In liquid water, an equilibrium exists between H2O(ℓ) molecules, H+(aq) ions, and OH−(aq) ions. A person experiencing acid indigestion after drinking tomato juice can ingest milk of magnesia to reduce the acidity of the stomach contents. Tomato juice has a pH value of 4. Milk of magnesia, a mixture of magnesium hydroxide and water, has a pH value of 10. The balanced chemical equation is 2H2 + O2 = 2H2O.

Why are resources limited

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Resources can be limited from too much use. Scarcity is one word describing this conundrum. We must be careful with what we use because too much causes harm.

Consider the dissolution of 2.50 grams of salt XY in 75.0 mL of water within a calorimeter. The temperature of the water decreased by 0.93 oC. The heat capacity of the calorimeter is 42.2 J/oC. The density of the water (and the solution) is 1.00 g/mL. The specific heat capacity of the solution is 4.184 J/goC. Calculate the enthalpy change for dissolving this salt on a energy per mass basis (units of J/g).

Answers

The enthalpy change for dissolving this salt on a energy per mass is 136.32 J/g

How to determine the mass of the water

Density of water = 1 g/mL
Volume of water = 75 mL
Mass of water =?

Mass = Density × Volume

Mass of water = 1 × 75

Mass of water = 75 g

How to determine the heat absorbed by the solution

Mass of water = 75 g
Mass of salt = 2.50 g
Mass of solution (M) = 75 + 2.5 = 77.5 g
Temperature change (ΔT) = 0.93 °C
Specific heat capacity of the solution = 4.184 J/gºC
Heat of solution (Q) =?

Q = MCΔT

Q = 77.5 × 4.184 × 0.93

Q = 301.5618 J

How to determine the heat consumed by the calorimeter

Heat capacity of the calorimeter (C) = 42.2 J/ºC
Temperature change (ΔT) = 0.93 °C

Heat by calorimeter (H) =?

H = CΔT

H = 42.2 × 0.93

H = 39.246 J

How to determine the total heat released

Heat of solution (Q) = 301.5618 J
Heat by calorimeter (H) = 39.246 J

Total heat =?

Total heat = 301.5618 + 39.246

Total heat = 340.8078 J

How to determine the enthalpy change

Total heat = 340.8078 J
Mass of salt = 2.5 g

Enthalpy change (ΔH) =?

ΔH = Total heat / mass

ΔH = 340.8078 / 2.5

ΔH = 136.32 J/g

Learn more about heat transfer:

brainly.com/question/6363778

Answer : The enthalpy change for dissolving this salt on a energy per mass basis is 132.4 J/g

Explanation :

Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water

$q=[q_1+q_2]$

$q=[c_1* \Delta T+m_2* c_2* \Delta T]$

where,

q = heat released by the reaction

$q_1$ = heat absorbed by the calorimeter

$q_2$ = heat absorbed by the water

$c_1$ = specific heat of calorimeter = $42.2J/^oC$

$c_2$ = specific heat of water = $4.184J/g^oC$

$m_2$ = mass of water = $Density* Volume=1/mL* 75.0mL=75.0g$

$\Delta T$ = change in temperature = $0.93^oC$

Now put all the given values in the above formula, we get:

$q=[(42.2J/^oC* 0.93^oC)+(75.0g* 4.184J/g^oC* 0.93^oC)]$

$q=331.08J$

Now we have to calculate the enthalpy change for dissolving this salt on a energy per mass basis.

$\Delta H=(q)/(m)$

where,

$\Delta H$ = enthalpy change = ?

q = heat released = 331.08 J

m = mass of salt = 2.50 g

$\Delta H=(331.08J)/(2.50g)=132.4J/g$

Therefore, the enthalpy change for dissolving this salt on a energy per mass basis is 132.4 J/g

If fluorine 20 undergoes beta decay , what will it become ?

Answers

to be honest im not for sure because you don't have any answer choices

Fluorine 20 will decay to stable.

QUICK QUESTION: On the Bohr model, how come potassium has 19 electrons in its valence shell if potassium has a K+? Isn’t it suppose to have 18 electrons? I thought that if an ion has a positive charge, the atom has lost electrons. Pls help me I WILL GIVE BRAINLIEST TO THE BEST ANSWER

Answers

Answer: K only has 1 valence electron. It will leave with only a little effort, leaving behind a positively charged K^+1 atom.

Explanation: A neutral potassium atom has 19 total electrons. But only 1 of them is in potassium's valence shell. Valence shell means the outermost s and p orbitals. Potasium's electron configuration is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1. The 4s orbital is the only orbital in the 4th energy level. So it has a valency of 1. This means this electron will be the most likely to leave, since it is the lone electron in the oyutermost energy level (4). When that electron leaves, the charge on the atom go up by 1. The atom now has a full valence shell of 3s^2 3p^6, the same as argon, Ar.

What two factors determine the thermal energy in a substance

Answers

the answer to that is mass and chemical

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