(a) in an experiment, cold water is poured into a bowl made of an insulating material, the containeris placed in a draught-free room. After several hours, the volume and the temperature of the

water are found to have decreased.

Name and describe the process that causes the decrease in the volume of the water, and

explain why the temperature of the water decreases.

Answers

Answer 1

Answer:

Answer: Evaporation and heat loss to the surrounding.

Explanation:

The process is known as evaporation.

Evaporation takes place at any temperature but increases with increase in temperature. The molecules of water evaporate, that is, escape into the atmosphere thereby causing the volume of water to reduce.

The temperature decreases due to heat loss from the water into the surrounding. This will cause the temperature of the water to drop.

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A student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student move the box?

If you travel at 3 m/s for 12 seconds, how far did you travel?

Answers

Answer:

$\boxed {\tt 36 \ meters }$

Explanation:

We want to find how far was traveled, or the distance.

The formula for distance is:

$d=s*t$

where $s$ is the speed and $t$ is the time.

The speed is 3 meters per second and the time is 12 seconds.

$s= 3 \ m/s \nt= 12 \ s$

Substitute the values into the formula.

$d= 3 \ m/s * 12 \ s$

Multiply. Note that when multiply, the seconds, or $s$ will cancel.

$d= 3 \ m * 12$

$d= 36 \ m$

$d= 36 \ meters$

The distance traveled was 36 meters.

Answer:

V=3 m/s

t=12 seconds

S=?

S=V×t

S=3×12

S=36meters

So distance you travel is 36meters.

A solid aluminum cube has sides each of length L . A second cube of the same material has sides four times the length of the first cube; i.e., 4 L . Compared to the first cube, the total surface area of the second cube is 1. twenty-seven times the first cube. 2. sixteen times the first cube. 3. sixty-four times the first cube. 4. eight times the first cube. 5. twenty-four times the first cube. 6. two times the first cube

Answers

Answer:

Option (2): Sixteen times the first cube

Explanation:

$Surface \: Area \: of \: Cube = 6 {a}^(2)$

$(T.S.A \: of \: larger \: cube)/(T.S.A \: of \: smaller \: cube) = \frac{6 * 16 {l}^(2) }{6 * {l}^(2) } = 16$

When the linear dimensions of a solid are multiplied by ' R ', the surface area of all or any part of it increases by R² , and the volume of all or any part of it increases by R³ .

If the sides of the second cube are 4 times the sides of the first one, then the second cube has (4²) = sixteen times the surface area of the first one (2), and it has (4³) = 64 times the volume of the first one.

Carbon and hydrogen are examples of pure substances or

Answers

Answer:

Elements

Explanation:

Carbon and Hydrogen are pure substances or elements. All the atoms of carbon have same number of protons. It cannot be broken into new elements.

Contrary to elements, there are compounds which are formed by the chemical bonds between two or more elements like in water. In water, Hydrogen and oxygen elements combine. All the atoms of water do not have the same number of protons. Then, there are mixtures where elements are not chemically bound. For example, air.

The are elements on the periodic table

Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag?

Answers

Answer;

18 Joules

Explanation;

Work is the measures the transfer of energy when an object moves over a given distance.

Work is therefore given by; Force × distance

Force =36 Newtons

Distance = 0.5 meters

Hence; work = 36 N × 0.5 N

= 18 Joules

the answer is 18 joules hope this helps

If the activation energy for a given compound is found to be 103 kJ/mol, with a frequency factor of 4.0 × 1013 s-1, what is the rate constant for this reaction at 398 K?

Answers

Answer: The Rate constant is 1.209

Explanation:

in the attachment

Explanation:

Below is an attachment containing the solution.

A police car is parked by the side of a highway and its siren emits a sound measuring 750 Hz. As you approach the police car from a distance, you hear a change in the sound. The change is in the sound's

Answers

As you approach the police car with blaring siren, you hear a change in pitch and frequency. The apparent pitch changes as a result of the Doppler effect. Frequency determines pitch; frequency and wavelength are inversely proportional. You wouldn't "hear" either one. The result is pitch.

D) pitch and frequency.

Answer:

The correct answer would be frequency, intensity, and amplitude.

It can be explained with the help of Doppler effects which states that the frequency or wavelength of sound changes (increases or decreases) as source and observer move towards or away from each other.

Due to this effect, the frequency and intensity of siren increase as we move towards the siren.

In addition, amplitude also increases as we move towards the source of the sound and decreases as the observer moves away from the source.

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