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Vsevolod [243]
2 years ago
7

Sasha did an experiment to study the solubility of two substances. She poured 100 mL of water at 20 °C into each of two beakers

labeled A and B. She put 50 g of Substance A in the beaker labeled A and 50 g of Substance B in the beaker labeled B. The solution in both beakers was stirred for 1 minute. The amount of substance left undissolved in the beakers was weighed. The experiment was repeated for different temperatures of water and the observations were recorded as shown.
Part 1: Which substance has a higher solubility?

Part 2: Explain your answer for Part 1.
Chemistry
1 answer:
amm18122 years ago
8 0

Answer:

A

Explanation:

The solubility of a substance is directly proportional to the temperature. It means that solubility will increase with the increases in temperature. At higher temperature, the kinetic energy increased that allow the solvent molecules to break the solute particles more effectively.

Substance A has a higher solubility because the weight of substance A measured at the end of the experiment is less than the weight of substance B.

Hence, the correct answer is A.

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How much heat is released as the temperature of 25.2 grams of iron is decreased from 72.1°C to 9.8°C? The specific heat of iron
prisoha [69]

Answer:

Q=-697.06\ J

Negative sign says that release of heat.

Explanation:

The expression for the calculation of the heat released or absorbed of a process is shown below as:-

Q=m\times C\times \Delta T

Where,  

\Delta H  is the heat released or absorbed

m is the mass

C is the specific heat capacity

\Delta T  is the temperature change

Thus, given that:-

Mass = 25.2 g

Specific heat = 0.444 J/g°C

\Delta T=9.8-72.1\ ^0C=-62.3\ ^0C

So,  

Q=25.2\times 0.444\times -62.3\ J=-697.06\ J

Negative sign says that release of heat.

8 0
2 years ago
Living things transform kinetic energy into potential chemical energy in the
Cloud [144]
<Sgx,JASYLDhLAxhclsxb cddont know
8 0
2 years ago
Identify the Lewis acids and Lewis bases in the following reactions:
postnew [5]

Answer: 1. H^++OH^-\rightarrow H_2O  Lewis acid : H^+, Lewis base : OH^-

2. Cl^-+BCl_3\rightarrow BCl_4^- Lewis acid : BCl_3, Lewis base : Cl^-

3. K^++6H_2O\rightarrow K(H_2O)_6 Lewis acid : K^+, Lewis base : H_2O

Explanation:

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

1. H^++OH^-\rightarrow H_2O

As H^+ gained electrons to complete its octet. Thus it acts as lewis acid.OH^- acts as lewis base as it donates lone pair of electrons to electron deficient specie H^+.

2. Cl^-+BCl_3\rightarrow BCl_4^-

As BCl_3 is short of two electrons to complete its octet. Thus it acts as lewis acid. Cl^- acts as lewis base as it donates lone pair of electrons to electron deficient specie BCl_3.

3. K^++6H_2O\rightarrow K(H_2O)_6

As K^+ is short of electrons to complete its octet. Thus it acts as lewis acid. H_2O acts as lewis base as it donates lone pair of electrons to electron deficient specie K^+.

8 0
2 years ago
A 0.821 gram sample of pure NH F was treated with 25.0 mL of 1.00 M NaOH
Olegator [25]

Answer:

0.0222 mole of NaOH is needed to react with NH4F

Explanation:

NH4F + NaOH --> NaF + NH3 + H2O

Data given

Mass of NH4F =0.821g, Concentration of NaOH= 1M, volume of NaoH =25ml

But mole = (CV)/1000

given mole of NaoH = (1 * 25)/1000 = 0.025moles of NaOH used

Molar mass of NH4F = 37g/mol

mole of NH4F used 0.821 / 37 = 0.0222 mole NH4F

Determine the excess and limiting reactant,

NaOH is in excess

0.025 - 0.0222 = 0.0028 mole NaOH excess

0.0222 mole of NaOH is required to react with NH4F

8 0
2 years ago
Suppose an acorn with a mass of 3.17 g falls off a tree. At a particular moment during the fall, the acorn has a kinetic energy
Alona [7]

Answer:

Option A is correct

Explanation:

Potential energy of acorn is due to its position i.e height and kinetic energy Is due to velocity or speed with which it is moving. When the acorn is at tree, its potential energy is maximum and kinetic energy is zero. While it starts moving downward, the height starts reducing and the speed increase. Thus potential energy reduces and kinetic energy increases.  

But as it touches the ground, its kinetic energy becomes zero as speed is zero and potential energy also becomes zero as height is zero.  

Thus, option A is correct

4 0
2 years ago
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