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UNO [17]
3 years ago
14

True or false an example of a theory is Newton's theory of gravity

Chemistry
2 answers:
jeka943 years ago
5 0

False.

Its newtons <u>law</u> of gravity. We already know that it works and has been proven.

A <u>theory</u> is an idea, or something that someone believes to be true, but might not be

iris [78.8K]3 years ago
4 0
False because not exists the Newtons Theory of gravity.
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If 75 grams of oxygen react, how many grams of aluminum are required?
german

Answer:

84.24 g

Explanation:

Given data:

Mass of oxygen = 75 g

Mass of Al required to react = ?

Solution:

Chemical equation:

4Al + 3O₂     →   2Al₂O₃

Number of moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 75 g/ 32 g/mol

Number of moles = 2.34 mol

Now we will compare the moles of oxygen with Al.

                          O₂         :          Al

                           3          :             4

                        2.34        :         4/3×2.34 = 3.12 mol

Mass of Al required:

Mass = number of moles × molar mass

Mass = 3.12 mol × 27 g/mol

Mass = 84.24 g

5 0
2 years ago
An example of a substance that can be decomposed by a chemical change is:
Savatey [412]

The answer is iron..

7 0
3 years ago
Read 2 more answers
The formulas for elements never contain a subscript true or not true
Andru [333]
The answer should be false. Elements contain only one atom.
7 0
3 years ago
Copper was the first metal to be produced from its ore because it is the easiest to smelt, that is, to refine by heating in the
Ganezh [65]

Answer:

57.48%

Explanation:

Calculate the mass of 1 mole of malachite:

MM Cu = 63.55

MM O = 16.00

MM H = 1.01

MM C = 12.01

(Cu_{2}(OH)_{2}CO_{3})

A mole of malachite has:

2 moles of Cu

5 moles of O

2 moles of H

1 mole of C

MW Malachite = 2*MM(CU) + 5*MM(O) + 2*MM(H) + 1 *MM(C)

MW Malachite = 2*63.55 + 5*16.00 + 2*1.01 + 1*12.01

MW Malachite = 221.13

Mass of Cu in a mole of Malachite = 2*MM(CU) = 127.1

Now divide the mass of Cu by the mass of Malachite

%Cu = \frac{127.1}{221.13} =0.5748=57.48%

7 0
3 years ago
What is an indicator that a chemical change has occurred?
Aleks04 [339]

Answer:

That something has changed chemically

Explanation:

Uh...Google it

6 0
3 years ago
Read 2 more answers
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