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soldi70 [24.7K]
3 years ago
14

Select all of the following that are physical changes A. turning a tin can into aluminum foil B. breaking a window into very tin

y pieces C. photosynthesis D. iron rusting and breaking apart E. crushing a can F. melting a can
Chemistry
1 answer:
Ede4ka [16]3 years ago
5 0

Answer:

A, B, E

Explanation:

thats just how it works

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In one sample of a compound of copper and oxygen, 3.12g of the compound contains 2.50g of copper and the remainder is oxygen. Ca
blsea [12.9K]

Answer:

% composition O = 19.9%

% composition Cu = 80.1%

Explanation:

Given data:

Total mass of compound = 3.12 g

Mass of copper = 2.50 g

Mass of oxygen = 3.12 - 2.50 = 0.62 g

% composition = ?

Solution:

Formula:

<em>% composition = ( mass of element/ total mass)×100</em>

% composition Cu = (2.50 g / 3.12 g)×100

% composition Cu = 0.80 ×100

% composition Cu = 80.1%

For oxygen:

<em>% composition = ( mass of element/ total mass)×100</em>

% composition O = (0.62 g / 3.12 g)×100

% composition O = 0.199 ×100

% composition O = 19.9%

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3 years ago
What part of the sun do we see from earth?
NISA [10]

Answer:

photosphere

Explanation:

photosphere

There are 3 main layers of the Sun that we can see. They are the photosphere, the chromosphere and the corona. Together they make up the "atmosphere" of the Sun. The part of the Sun that glows (and that we see with the naked eye) is called the photosphere

8 0
3 years ago
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Jim can jog 800 m in 16 minutes. How many meters can he jog<br> in a minute?
RSB [31]

Answer: 50 meters

Explanation:

5 0
3 years ago
An isotope has the same number of______but a different number of____than other atoms of the same element. :)
Andre45 [30]

Answer:

an isotope has the same number of protons but a different number of neutrons than the other atoms of the same element.

6 0
3 years ago
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All acids have the ___ ion in common
otez555 [7]

Answer: hydrogen

All acids have the hydrogen ion in common

Explanation:

According to Arrhenius theory, an acid is a substance which dissociate in water to produce hydrogen ions, H+;

For example: HCl --> H+ + Cl-

while a base is a substance which gives hydroxide ions, OH-, in water

For example: NaOH(s) --> Na+(aq) + OH-(aq)

Thus, all acids have the hydrogen ion in common

3 0
3 years ago
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