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Basile [38]
3 years ago
5

How many scientific methods

Chemistry
1 answer:
iogann1982 [59]3 years ago
8 0

Answer:

There is one scientific method

it starts with an

OBSERVATION

then a HYPOTHESIS

which goes to planning, creating an EXPERIMENT

and finally a conclusion for your results

Explanation:

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Why does 4.03/0.0000035 = 1.2 x 106, instead of a different number of significant figures?
jasenka [17]

Explanations:- As per the significant figures rule, In multiplication and division, we go with least number of sig figs.

4.03 has three sig figs where as 0.0000035 has two sig figs only, The zeros in this number are not sig figs as they are just holding the place values. As the least number of sig figs here is two, the answer needs to be reported with two sig figs only.

\frac{4.03}{0.0000035}=1.2*10^6



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Predict the missing component of each reaction
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Answer:  1. 3O_2

2. H_2O

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

1. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

2KClO_3\rightarrow 2KCl+3O_2

Thus in balanced chemical decomposition of 2KClO_3 , the missing component is 3O_2.

2. Synthesis is a type of chemical reaction in which two reactants combine to give a single product.

MgO+H_2O\rightarrow Mg(OH)_2

Thus in balanced synthesis reaction of Mg(OH)_2 , the missing component is H_2O.

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