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4 years ago

6

2. How does a particles energy change as it changes state?

1 answer:

Iteru [2.4K]4 years ago

6 0

When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.
In chemistry, a pure substance is a sample of matter with both definite and constant composition and distinct chemical properties. To avoid confusion, a pure substance is often referred to as a "chemical substance."

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What is an electron and proton?

kirza4 [7]

Explanation:

An electron is a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

A proton is a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

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3 years ago

What is the largest area of a circle that can be made from a piece of thread 25.2cm long assume no knot

Zarrin [17]

Answer:

$50.2 cm^2$

Explanation:

Here we want to find the largest area of a circle that can be made from a piece of thread 25.2 cm long, assume no knot .

This means that the circumference of the circle must equal to the length of the thread, so we can write:

L = 25.2 cm

And the circumference can be written as:

$2\pi r = L = 25.2$

where

r is the radius of the circle

Solving for r, we find the radius:

$r=\frac{L}{2\pi}=\frac{25.2}{2\pi}=4.0 cm$

The area of a circle is given by the formula

$A=\pi r^2$

So in this case, we find:

$A=\pi (4.0)^2=50.2 cm^2$

7 0

4 years ago

How did Democritus help our understanding of the atom?

Elza [17]

He discovered the atom while standing on a beach talking. Although, he thought the atom was like a ping pong ball.

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4 years ago

How much energy is needed to vaporize 75.0 g of diethyl ether (c4h10o) at its boiling point (34.6°c), given that δhvap of diethy

malfutka [58]

Answer: 26.8 kJ of energy is needed to vaporize 75.0 g of diethyl ether

Explanation:

First we have to calculate the moles of diethyl ether

$\text{Moles of diethyl ether}=\frac{\text{Mass of diethyl ether}}{\text{Molar mass of diethyl ether}}=\frac{75.0g}{74g/mole}=1.01moles$

As, 1 mole of diethyl ether require heat = 26.5 kJ

So, 1.01 moles of diethyl ether require heat = $\frac{26.5}{1}\times 1.01=26.8kJ$

Thus 26.8 kJ of energy is needed to vaporize 75.0 g of diethyl ether

5 0

4 years ago

you have a lead ball with a mass of 420 g. the density of lead is 10.5 g/cm³. what is the volume of the ball

IrinaK [193]

Answer:

The answer is

<h2>40.0 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density}$

From the question

mass = 420 g

density = 10.5 g/cm³

The volume is

$volume = \frac{420}{10.5} \\$

We have the final answer as

<h3>40.0 mL</h3>

Hope this helps you

7 0

3 years ago