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svetlana [45]
3 years ago
6

Select all that apply. A scientific law: A- is generally accepted as true B- has never been found to be in error C- has no known

contradictions D- must be reverified occasionally
Chemistry
2 answers:
Anon25 [30]3 years ago
6 0

A and D

They are sometimes proven wrong and contradicted, so these would make the most sense

Sidana [21]3 years ago
4 0

Answer:

A) is generally accepted as true

D)must be re verified occasionally

Explanation:

A scientific law is proposed based on some scientific studies including hypothesis, thesis , verification etc.

These when proposed are considered as true that is why they are accepted.

However with time they must be re verified occasionally so that if chance of some contradiction and error can be minimized. For example periodic law proposed by Mendleev was based on atomic weight which was later on changed to be based on atomic number.

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If you burn 29.4 g of hydrogen and produce 263 g of water, how much oxygen reacted?
vovikov84 [41]

The reaction between hydrogen and oxygen to form water is given as:

H_2 + O_2 \rightarrow H_2O

The balanced reaction is:

2H_2 + O_2 \rightarrow 2H_2O

According to the balanced reaction,

4 g of hydrogen (4\times 1) reacts with 32 g of oxygen (2\times 16).

So, oxygen reacted with 29.4 g of hydrogen is:

\frac{29.4\times 32}{4} = 235.2 g

Hence, the mass of oxygen that is reacted with 29.4 g of hydrogen is 235.2 g.

7 0
3 years ago
Do metals form are anions or cations?
goldfiish [28.3K]

Answer: Metals form cations.

The alkali metals (the IA elements) lose a single electron to form a cation with a 1+ charge.

The alkaline earth metals (IIA elements) lose two electrons to form a 2+ cation.

Aluminum, a member of the IIIA family, loses three electrons to form a 3+ cation.

Therefore, metals in the s and p block of the periodic table have 1, 2 or 3 electrons in their outermost orbit (or valence shell). Now to gain a stable octet metals lose either 1, 2 or 3 electrons from the valence shell thus forming cation with +1, +2 or +3 charge.

5 0
3 years ago
Briefly describe how the structure of each molecule differs
son4ous [18]

Answer:

A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion. All molecules are not compounds. All compounds are molecules.

8 0
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Which choice names part of the lithosphere?
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How would you balance this equation<br><br> HCL+ Ba &gt; BaCL2 + H2
vladimir2022 [97]
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5 0
3 years ago
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