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4 years ago

Wich of these is not a sign of chemical change 1 A gas is given off

Physics

1 answer:

mash [69]4 years ago

5 0

<h3>Answer:</h3>

2. The material dissolves

<h3>Explanation:</h3>

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

Chemical change is a type of change that involves formation of a new substance different from the original substance.

Second we need to identify the signs that indicate the occurrence of a chemical change

Chemical change in chemical reactions is characterized by various signs which include;

Production of bubbles
Color change
Formation of a precipitate
Change of odor
Change in temperature.

Therefore, in this case, the material dissolving is not a sign that chemical change has taken place.

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fiasKO [112]

This is what i put:

<span> The Grand Canyon is made up of sedimentary rock; over time, sediments formed into layers. The layers on the bottom are the oldest, and the layers on the top are the youngest and newest.

Try and paraphrase though</span>

5 0

3 years ago

If an X-ray beam of wavelength 1.4 × 10-10 m makes an angle of 30° with a set of planes in a crystal causing first order constru

kkurt [141]

Answer:

Plane spacing, $d=1.4\times 10^{-10}\ m$

Explanation:

It is given that,

Wavelength of x-ray, $\lambda=1.4\times 10^{-10}\ m$

Angle the x-ray made with a set of planes in a crystal causing first order constructive interference is 30 degrees

We need to find the plane spacing. It is based on Bragg's law such that,

$2d\sin\theta=n\lambda$

d is plane spacing

n = 1 here

$d=\dfrac{\lambda}{2\sin\theta}\\\\d=\dfrac{1.4\times 10^{-10}}{2\times \sin (30)}\\\\d=1.4\times 10^{-10}\ m$

So, the plane spacing is $1.4\times 10^{-10}\ m$ .

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3 years ago

A chemical hazard symbol means you should not inhale fumes or let the chemicals contact your skin.

pantera1 [17]

The answer is true
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3 years ago

Why does a compass work differently on a moon then it would on earth

pogonyaev

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3 years ago

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Shkiper50 [21]

A. Radiation, conduction

B.
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6 0

3 years ago