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2 years ago

Why is the evaporation of water a physical change and not a chemical change?

2 answers:

6 0

The evaporation of water is a physical change because it isn't undergoing any chemical reactions. In other words nothing is being combined to form a new substance or substances.

Levart [38]2 years ago

5 0

When water turn into gas, it is still water molecules that are gaseous. If you boil a pot of water, the steam that is released is still water. It doesn't change to something else. A chemical change is a change where something completely changed. While a physical property is like a change of state ( solid, liquid or gas)

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Write two ways to be protected from the energy crisis?

Arada [10]

Possible Solutions to the Problem of Global Energy Crisis:

1. Move Towards Renewable Resources.
2. Buy Energy-Efficient Products.

5 0

2 years ago

A boy starts from point A and walks 3 meters toward the south, then turns around and walks 7 meters toward the north. What is th

jolli1 [7]

Answer:

-3m+7m = 4m

Explanation:

As he walks south, he is going down 3m (-3m). Then he walks up 7m (+7m).

You subtract the final position from the initial position to get displacement.

7m - 3m = 4m

7 0

2 years ago

The diffusion constant for oxygen diffusing through tissue is 1.0 × 10-11 m2/s. In a certain sample oxygen flows through the tis

Eduardwww [97]

Answer:

m' = 1 x 10⁻⁶ kg/s

Explanation:

Given that

Diffussion constant = 1 x 10⁻¹¹

Mass flow rate ,m = 2 x 10⁻⁶ kg/s

The diffusion is inversely proportional to the thickness of the membrane and therefore when the thickness is doubled, the mass flow rate would become half.

So new flow rate m'

$m'=\dfrac{m}{2}$

$m'=\dfrac{2\times 10^{-6}}{2}\ kg/s$

m' = 1 x 10⁻⁶ kg/s

6 0

2 years ago

How many centimeters are there in a stick 3.4 meters long?

levacccp [35]

Answer:

It's 340 centimeters.

Explanation:

Multiply it by 100

4 0

1 year ago

Read 2 more answers

Determine the radial acceleration of the ultracentrifuge using calculations

Dmitry [639]

When something moves on a round track, the guidance of the something's velocity must continually switch. A switching velocity means that there must be an acceleration. This acceleration is horizontal to the guidance of the velocity. This is said as “the radial acceleration”, or “centripetal acceleration” ("centripetal" means "center searching"). The “radial acceleration” is equal to “the square of the velocity”, divided by “the radius of the circular path of the object”. The unit of the “centripetal acceleration” is m/s².

$\text { Centripetal acceleration }=\frac{\text {velocity}^{2}}{\text {radius of motion}}$

$\mathrm{a}_{\mathrm{rad}}=\frac{V^{2}}{r}$

where,

$\text { and }=\text { radial, or centripetal, acceleration }(\mathrm{m} / \mathrm{s} ^2)$

"v" = "velocity" (m/s) and "r" = "radius of motion of the object" (m)

3 0

3 years ago