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3 years ago

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Chemistry

1 answer:

lana66690 [7]3 years ago

5 0

Your answer is:

A volcano spewing out smoke and gases

__________________________

When volcano erupts, various kinds of substances comes out from the interior of earth. A large amount of gases and smoke also come out and enter into atmosphere. These can adversely affect the weather of the area and lead to many health problems.

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Approximately how many ice cubes must melt to cool 650 milliliters of water from 29°C to 0°C? Assume that each ice cube contains

qwelly [4]

Answer : The number of ice cubes melt must be, 13

Explanation :

First we have to calculate the mass of water.

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}$

Density of water = 1.00 g/mL

Volume of water = 650 mL

$\text{Mass of water}=1.00g/mL\times 650mL=650g$

Now we have to calculate the heat released on cooling.

Heat released on cooling = $m\times c\times (T_2-T_1)$

where,

m = mass of water = 650 g

c = specific heat capacity of water = $4.18J/g^oC$

$T_2$ = final temperature = $29^oC$

$T_2$ = initial temperature = $0^oC$

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

Heat released on cooling = $650g\times 4.18J/g^oC\times (29-0)^oC$

Heat released on cooling = 78793 J = 78.793 kJ (1 J = 0.001 kJ)

As, 1 ice cube contains 1 mole of water.

The heat required for 1 ice cube to melt = 6.02 kJ

Now we have to calculate the number of ice cubes melted.

Number of ice cubes melted = $\frac{\text{Total heat}}{\text{Heat for 1 ice cube}}$

Number of ice cubes melted = $\frac{78.793kJ}{6.02kJ}$

Number of ice cubes melted = 13.1 ≈ 13

Therefore, the number of ice cubes melt must be, 13

3 0

4 years ago

How many grams of chlorine gas must react to give 3.52g of BiCl3 according to the equation in exercise 23?

marshall27 [118]

3.52g BiCl3 × 1 mol BiCl3/ 315.34g BiCl3 × 3 mol Cl/ 2 mol BiCl3 × 70.906g Cl/ 1 mol Cl= 1.187 g Cl

6 0

4 years ago

Read 2 more answers

Consider the dissolution of calcium hydroxide:

Crazy boy [7]

Answer:

1. $K_eq = [Ca^{2+][OH^-]^2 = K_{sp}$

2. a. No effect;

b. Products;

c. Products;

d. Reactants

Explanation:

1. Equilibrium constant might be written using standard guidelines:

only aqueous species and gases are included in the equilibrium constant excluding solids and liquids;
the constant involves two parts: in the numerator of a fraction we include the product of the concentrations of products;
the denominator includes the product of the concentrations of reactants;
the concentrations are raised to the power of the coefficients in the balanced chemical equation.

Based on the guidelines, we have two ions on the product side, a solid on the left side. Thus, the equilibrium constant has the following expression:

$K_eq = [Ca^{2+][OH^-]^2 = K_{sp}$

2. a. In the following problems, we'll be considering the common ion effect. According to the principle of Le Chatelier, an increase in concentration of any of the ions would shift the equilibrium towards the formation of our precipitate.

In this problem, we're adding calcium carbonate. It is insoluble, so it wouldn't have any effect on the equilibrium.

b. Sodium carbonate is completely soluble, it would release carbonate ions. The carbonate ions would combine with calcium cations and more precipitate would dissolve. This would shift the equilibrium towards formation of the products to reproduce the amount of calcium cations.

c. HCl would neutralize calcium hydroxide to produce calcium chloride and water, so the amount of calcium ions would increase, therefore, the products are favored.

d. NaOH contains hydroxide anions, so we'd have a common ion. An increase in hydroxide would produce more precipitate, so our reactants are favored.

3 0

3 years ago

Drag each quantity to the correct location on the table. Complete the table of bond energies and bond lengths. 125 pm 145 pm 167

stiv31 [10]

Answer: N-N: 145 pm and 167 KJ/mol

N=N: 125 pm, 418 KJ/mol

And N2: 110 pm , 942 KJ/mol

Explanation: Bond length is inversily proportional to bond energy.

Greater the bond length , smaller the bond energy and vice-versa.

7 0

3 years ago

PLZ HELP PLZ HELP I AM IN NEED WHOEVER GETS CORRECT ANSWER GETS 30 POINTS NO WRONG ANSWERS PLZ

Nezavi [6.7K]

Answer:

its pb because it has large number of electrons

hope it helps you

6 0

3 years ago

Read 2 more answers