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3 years ago

Which (3 of the 4) quantities must be conserved in all chemical reactions?

1 answer:

7 0

Mass, charge, and energy are conserved, no matter how much volume of
space they may be spread through either before or after the reaction.

Concerning density ...
Think about the fascinating classroom demonstration where the teacher
drops a tiny pellet of sodium into a glass of water. The sodium gets very
excited, and it skates and skitters around on the surface of the water,
faster and faster, and eventually it explodes. All the girls in the class
scream, while the guys are just sitting there and staring at the cloud
of steam that's rising from the glass of water. The whole point here
is that the density of the steam is much different from the density of
either the water or the sodium that reacted to create it. The density
is not conserved.

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Which particle has the least mass? Proton, a helium atom, electron, hydrogen atom

Tpy6a [65]

Answer:electron

Explanation:

3 0

2 years ago

When you jump-starts a car, what happens to the stored energy in the working battery? PLEASE ANSWER

Yuri [45]

The stored energy in the battery does not work anymore.

4 0

3 years ago

What represents a community? pond B a snail snails D snails, guppies and plants

OLga [1]

D snails, guppies and plants. The community should be diverse and have lots of biodiversity.

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2 years ago

The teal line of the hydrogen emission spectrum has a wavelength of 486.0 nm. A hydrogen emission spectrum has a violet, a blue,

Sloan [31]

Answer:

The correct answer to the following question will be "4.08 × 10⁻¹⁹ Joule".

Explanation:

Given:

Wavelength, λ = 486.0 nm

As we know,

$E=h\upsilon =\frac{hc}{\lambda}$

On putting the estimated values, we get

⇒ $=\frac{1241.5 \ ev\ nm}{486 \ nm}$

⇒ $=2.554 \ ev$

∴ 1 ev = 1.6 × 10⁻¹⁹ J

Now,

Energy, $E=2.554\times 1.6\times 10^{-19}$

⇒ $=4.08\times 10^{-19} Joule$

7 0

3 years ago

1. In which of these forms does acid precipitation reach the surface of Earth?

vodomira [7]

Answer:

Wet deposition

Explanation:

when the chemicals produced in the Earth can evaporate and reach the clouds, it will mixed with the water inside the clouds and form a slightly acid water than when is time to deposit the water into the Earth as snow, rain, fog or mist, the chemicals will travel with the water dissolved in it.

When they reach the soil, eventually, the water will evaporate or will be absorbed by soil, so the chemicals that are left behind, will reach the surface of Earth.

Depending where the chemicals were deposit, they can contaminate the sea, or other water bodies, or soil areas of crops, buildings, etc.

Hope this info is useful.

5 0

3 years ago