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3 years ago

What type of reaction is shown in this thermochemical equation? a b heat → c d

Chemistry

2 answers:

Mekhanik [1.2K]3 years ago

4 0

Endothermic reaction

ANEK [815]3 years ago

4 0

Explanation:

A chemical reaction in which heat is absorbed by reactants and hence energy of reactants is more than products is known as an endothermic reaction.

For example, $A + B + Heat \rightarrow C + D$ is an endothermic reaction.

Whereas when heat is released by reactants in a chemical reaction then energy of reactants is less than the energy of products. Therefore, this type of reaction is known as exothermic reaction.

For example, $A + B \rightarrow C + D + Heat$ is an exothermic reaction.

Thus, we can conclude that the reaction a b heat → c d is endothermic reaction.

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A boat sails into a bay and drops anchor. Several hours later, it is surrounded by mud. What

WARRIOR [948]

Answer:

the flow of the water pushed the mud around the anchor

Explanation:

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3 years ago

Gifblaar is a small South African shrub and one of the most poisonous plants known because it contains fluoroacetic acid (FCH2CO

PSYCHO15rus [73]

[H_{3}O^{+}] = 0.00770 M

The equilibrium equation representing the dissociation of $FCH_{2}COOH$

$FCH_{2}COOH(aq) + H_{2}O (l) FCH_{2}COO^{-}(aq)+ H_{3}O^{+}(aq)$

Given [H_{3}O^{+}] = 0.00770 M

Let the initial concentration of acid be x and change y

So y = $[H_{3}O^{+}]$ = $[FCH_{2}COO^{-}]$ = 0.00770 M

$pK_{a} = 2.59K_{a} = 10^{-2.59} = 0.00257 M$

$K_{a} = \frac{(0.00770 M)(0.00770 M)}{x - 0.00770}$

$0.00257 = \frac{0.00005929}{x - 0.00770}$

0.00257 x - 0.00001979 = 0.00005929

x = 0.031 M

Therefore, initial concentration of the weak acid is 0.031 M

4 0

4 years ago

What is the concentration of a solution formed by diluting 25.0 ml of a 3.2 M NaCl solution to 135.0 ml?

Irina-Kira [14]

Answer:

B) 0.59 M NaCl.

Explanation:

It is known that the no. of millimoles of NaCl before dilution = the no. of millimoles of NaCl after dilution.

∵ (MV) before dilution = (MV) after dilution.

∴ M after dilution = (MV) before dilution / V after dilution = (3.2 M)(25.0 mL)/(135.0 mL) = 0.5926 M ≅ 0.59 M.

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3 years ago

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Which item has more thermal energy?

Nitella [24]

Here we have to get the item which has more thermal energy among the given options.

The item a) will have more thermal energy than b)

The thermal energy of a compound can be determined from the formula H = m×s×t (H = thermal energy, m = mass of the compound, s = specific heat of the compound, t = temperature)

a) Here m = 500 g, s = 1 g/mL and t = 50⁰C (as the density of water is 1 g/mL thus its volume is equivalent to its mass)

Thus the thermal energy H = 500 × 1 × 50 = 25000 Cal (The energy needed to raise 1⁰C temperature of 1g water is calorie unit)

similarly,

b) Here m = 100 g, s = 1 g/mL and t = 50⁰C (as the density of water is 1 g/mL thus its volume is equivalent to its mass)

Thus the thermal energy H = 100 × 1 × 50 = 5000 Cal (The energy needed to raise 1⁰C temperature of 1g water is calorie unit).

Thus option a) i.e. 500 mL of water at 50 degree Celsius will have more thermal energy.

Thus the thermal energy of both the item have calculated and compared.

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3 years ago

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How does everyday activities like driving a car and using electricity lead to global warming?

algol13

The fossil fuels from cars go into the atmosphere causing global warming

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4 years ago

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