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2 years ago

In which state OF MATTER ARE THE PARTICALES ABLE TO MOVE AROUND ONE ANOTHER?

Chemistry

2 answers:

MAXImum [283]2 years ago

6 0

Gas and liquid. Both have particles that are able to move around

ANTONII [103]2 years ago

4 0

Gas and liquid are the two matters with particles that are able to move around one another

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When 20.0 g of KI are dissolved in 50.0 mL of distilled water in a calorimeter, the temperature drops from 24.0 °C to 19.0 °C. C

Reil [10]

<h2>Answer:</h2>

8.67kJ/mol

<h2>Explanations</h2>

The formula for calculating the amount of heat absorbed by the water is given as:

$\begin{gathered} q=mc\triangle t \\ q=50\times4.18\frac{J}{g^oC}\times(19-24) \\ q=50\times4.18\times(-5) \\ q=-1045Joules \\ q=-1.045kJ \end{gathered}$

Determine the moles of KI

$\begin{gathered} moles\text{ of KI}=\frac{mass\text{ of KI}}{molar\text{ mass of KI}} \\ moles\text{ of KI}=\frac{20g}{166g\text{/mol}} \\ moles\text{ of KI}=0.1205moles \end{gathered}$

Since heat is lost, hence the enthalpy change of the solution will be negative that is:

$\begin{gathered} \triangle H=-q \\ \triangle H=-(-1.045kJ) \\ \triangle H=1.045kJ \end{gathered}$

Determine the enthalpy of solution in kJ•mol-1

$\begin{gathered} \triangle H_{diss}=\frac{1.045kJ}{0.1205mole} \\ \triangle H_{diss}\approx8.67kJmol^{-1} \end{gathered}$

Hence the enthalpy of solution in kJ•mol-1 for KI is 8.67kJ/mol

4 0

10 months ago

A heated metal object measures 120⁰C. It is dropped into a small bucket filled with water that is 10⁰C. Which of the following i

VARVARA [1.3K]

Answer:

Explanation:

(d the water and metal will adjust to the same temperature between 10 degree c and 120 degree c this temperature will be call equilibrium temperature

7 0

2 years ago

Which subatomic particle has the least mass? electron proton neutron nucleus

Andreas93 [3]

the answer is electrons

4 0

3 years ago

Read 2 more answers

Type the correct answer in the box. Jay, Kip, and Tia are each measuring the concentration of a solution. They are doing experim

Kryger [21]

Answer:

The measurements taken by Jay are least likely to contain random errors.

Explanation:

All experimental measures are subject to errors.

Even when the colorimeter is properly calibrated and correctly used, there are random errors.

Random errors are are due to fortuitous factors, such as minor oversight by the observer or small changes of the conditions under which the measurements are made.

You can minimize the random errors by increasing the number of measurements, because the random errors tend to happen in any direction; some measures will be greater and other will be less than the true value.

Chance will make that errors in on direction cancel with errors in the opposed direction, making the average the best measure.

Thus, Jay, by repeating the experiment five times and taking the average measurement, is making that his measurements are least likely to contain random errors.

3 0

3 years ago

A scientist observed that in the presence of light, plants use carbon dioxide and water to make glucose and oxygen. This chemica

pav-90 [236]

Answer:

Option A, light energy from the sun

Explanation:

In the process of photosynthesis, the energy from sun in the form of light and heat is taken to undergo glycolysis and prepare glucose/starch (chemical).

Thus, the light and heat energy of sun is converted into the chemical energy.

Option B and C are incorrect because no kinetic energy or chemical energy is taken from any source.

Option D is also incorrect because heat is taken but it is not taken from the surrounding environment. The source of heat energy is sun.

Thus, only option A is correct

8 0

2 years ago