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3 years ago

A pan containing hot water is left on the counter and becomes cool mainly due to

Chemistry

2 answers:

blagie [28]3 years ago

7 0

It's B. Cold air penetrating hot water

kherson [118]3 years ago

7 0

C. heat from the water moving through the cooler air

I think it's C because when something cools down, it has to reach a point of thermal equilibrium with the matter (in this case air) around it. So heat transfer happens through convection from the heat in the pan to the cooler surrounding air. The heated air becomes less dense and rises, while cooler air, sinks to the surface of the water, gets heated, and rises.This convection cycle keeps happening until the water in the pan is around the same temperature with the air around it.

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Pls complete the table with the correct answer

nalin [4]

Answer:

The correct answer is :

Natural fibres: these fibers are found naturally in the environment such as cotton, hemp or wool, all are made naturally found fibers.

sr. no. name type

1 Cotton natural

2 Linen natural

3 Silk natural

4 Wool natural

5. Hemp natural

Artificial fibres: made from the polymerization of their monomer unit for example polyester made from coal and petroleum products.

sr. no. name type

1 Polyester artificial

2 Rayon artificial

3 Spandex artificial

4 Acrylic artificial

5. microfibers artificial

6 0

3 years ago

A weather balloon is filled with helium that occupies a volume of 5.37 104 L at 0.995 atm and 32.0°C. After it is released, it r

svp [43]

Answer:

The new volume is 63583 L

Explanation:

Step 1: Data given

The initial volume of the balloon = 5.37 * 10^4 L

The initial pressure = 0.995 atm

The initial temperature = 32.0 °C = 305.15 K

The pressure decreased to 0.720 atm

The temperature decreased to -11.7 °C = 261.45 K

Step 2: Calculate the new volume

P1*V1 / T1 = P2*V2/T2

⇒with P1 = the initial pressure = 0.995 atm

⇒with V1 = the initial volume = 5.37 *10^4 L

⇒with T1 = the initial temperature = 305.15 K

⇒with P2 = the decreased pressure = 0.720 atm

⇒with V2 = the new volume = TO BE DETERMINED

⇒with T2 = the decreased temperature : 261.45 K

(0.995 * 5.37*10^4)/305.15 = (0.720 * V2) / 261.45

V2 = 63583 L

The new volume is 63583 L

8 0

3 years ago

Determine whether the graph is that of a function by using the vertical-line test. If it is, use the graph to find (a) its domai

Ilia_Sergeevich [38]

Answer:

Following are the solution to this question:

Explanation:

If the draw a line perpendicular with y-axis thru the diagonal line check but it meets only one curved point, therefore the curve indicates a function not otherwise. They draw a vertical line perpendicular to the y-axis there, it just intersects one more chart point, which is why a graph is a feature:

In point a:

$\to Domain= [-\pi ,\pi ]\\\\\to Range = [-1,1]$

In point b:

Its y-axis length cut also by understanding the benefits of y-interception and the x-axis length gives the x-intercept.

$\to y-intercept = 1\\\\\to x-intercept = \frac{\pi}{2} ,- \frac{\pi}{2} \\\\$

In point C:

Every graph is y-axis symmetric because the left side of the column as well as the middle side of the graph is about the same.

3 0

3 years ago

Which of the following is not an undefined term? point ray line plane

Daniel [21]

Answer:

the answer would be c. plane

5 0

3 years ago

What is the answer for #6? And can u explain to me how u got it right?

Setler [38]

The answer is D, pH greater than 7. This is because when you make a solution of potassium hydroxide, it leads to an excess of hydroxide ions in the water. Since the concentration of hydroxide ions is greater than that of protons, it causes the water to be basic. The basic range on the pH scale is always greater than 7.

5 0

3 years ago