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3 years ago

A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place

Chemistry

1 answer:

Sergio [31]3 years ago

6 0

Answer:

Molecules in both the metal and the surrounding air will start moving at higher speeds.

Explanation:

Temperature is defined as a measure of the average kinetic energy of the molecules of a body.

The greater the temperature of a body, the greater the average kinetic energy of the molecules of the body and the greater the speed of the particles of the body.

A metal at 150°C will witness an increase in the average kinetic energy of its molecules, the molecules will speed up as temperature increases.

Similarly, the hot metal plate releases heat to the surrounding air molecules by radiation causing the surrounding air molecules to experience an increase in temperature and average kinetic energy. Thus the air molecules surrounding the metal hot plate also speed up.

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Which type of material incorporates a variety of substances to enhance desired properties such as strength and flexibility?

Blizzard [7]

Answer:

its a polymer

Explanation:

4 0

3 years ago

4. A piece of metal weighing 0.0713 g was placed in a eudiometer containing dilute aqueous HCl. After the metal fully dissolved,

Anastasy [175]

Complete Question

4. A piece of metal weighing 0.0713 g was placed in a eudiometer containing dilute aqueous HCl. After the metal fully dissolved, 23.5 mL of hydrogen gas was collected by displace-ment of water and a 400 mm column of water was observed. The water temperature was 258C and the barometric pressure was 758.8 mm Hg (torr). Refer to the Introduction and data sheet to solve the following problems.

a) What is the vapor pressure of the water vapor in the column? (Consult Appendix E.)

b) What is the pressure of the water column expressed in mm Hg (torr)? The density of mercury is 13.6 g/mL.

c) Calculate the pressure of the hydrogen gas above the water in the column.

d) Calculate the volume occupied by the hydrogen gas at STP.

Answer:

a) $25\textdegree C=23.8 torrs$

b) $P_w=758.8$

c) $P_w=758.8=735torr$

d) $V_2=20.82mL$

Explanation:

From the question we are told that:

Metal weight $M_m=0.0713g$

Volume Hydrogen $V_h=23.5mL$

Displace-ment Column of water 400 mm column of water

Temperature $T =258\textdegree C$

Barometric Pressure $p=758.8mmHg$

Vapour Pressure of water at $25^oC$

Generally from (Consult Appendix E.)

Va-pour Pressure of water at

$25\textdegree C=23.8 torrs$

Pressure of Water column

$P_w=758.8$

c) Pressure of Water column (Consult Appendix E.)

$P_w=758.8=735torr$

Generally the equation for ideal gas is mathematically given by

$\frac{p_1v_1}{T_1}=\frac{p_2v_2}{T_2}$

Therefore

$V_2=\frac{p_1V_1T_2}{T_1p_2}$

$V_2=\frac{735*23.5*273}{298*760}$

$V_2=20.82mL$

5 0

3 years ago

During this chemical reaction energy is absorbed. In the chemistry lab, this would be indicated by a decrease in temperature or

Semmy [17]

Reactions like this one absorb energy because the reactants have less potential energy than the products.

<h3>What is an Endothermic reaction?</h3>

This is the type of reaction in which the reactants absorb heat energy from the surroundings to form products.

This brings about a decrease in the temperature as a result of the reactants having less potential energy than the products thereby making option B the most appropriate choice.

Read more about Endothermic reaction here brainly.com/question/6506846

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2 years ago

Carbon -14 has a half- life of 5715 years. If a sample of carbon-has and original mass of 12g, what will be the amount remaining

Greeley [361]

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3 years ago

BRAINLIESTTTT ASAP!!! PLEASE HELP MEEEE :)

Scilla [17]

Precise is the close proximity of repeated measurements. In order to be precise, you need two or more measurements.

Accurate is the close proximity to the real (or expected) measurement.

<u>For Example: </u>

You are at the grocery store buying watermelons. The sign says that the watermelons all weigh 2 lbs. You weigh 3 of them on the scale next to the watermelon display. Their weights are 1.77, 1.80, and 1.82.

→ The <u>scale is precise</u> because it weighs all 3 of them at nearly the same value.

→ The <u>scale is not accurate </u> because their weights are not close to the expected value of 2.0

You take one of the watermelons to the cashier. The scale at the checkout counter weighs it as 1.99. The scale at the checkout counter is accurate. You cannot determine the precision of the scale at the checkout counter because you have no other values to compare it to.

Answer: Precise CANNOT be determined by one measurement.

Accurate CAN be determined by one measurement.

4 0

4 years ago