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Studentka2010 [4]
3 years ago
5

Which of the following is an example of observational scientific investigation?

Chemistry
2 answers:
Softa [21]3 years ago
8 0
B: nothing the color of the solution when heated
hoa [83]3 years ago
5 0

Answer:

The correct answer will be option-B.

Explanation:

A scientific investigation involves many steps to answer and explain the natural phenomenon.  The observational scientific investigation is a way which includes making an observation which is also the first step of the scientific method.

In the given question, observing the color of the solution while heating will be considered as an example of observational investigation as it states that something has been observed with the senses of the human. All other are cases of experimental investigation.

Thus, Option-B is the correct answer.

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When we add friction into the skate park what happens to the skater? Skate park questions
Sveta_85 [38]

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If you put friction in to skating rink then obvioulsy the skaters wont be able to glide and skate.

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7 0
3 years ago
Based on the reaction, identify the products.
igomit [66]

Answer:

The reactants are MgF₂ and Be.

This is a single displacement reaction.

Explanation:

Chemical reactions are written like this:

reactant + reactant  =>  product + product

There may be more or less reactants and products on each side, separated by + the plus sign. The reactants are on the left and the products are on the right.

In the equation BeF₂ + Mg  =>  MgF₂ + Be, <u>the products (on the right side) are MgF₂ and Be</u>.

Since the total reactants are equal to the total products, every element that you see on the left must also appear on the right. On the left, the question gave you the elements "Be", "F" and "Mg". On the right, "Be" was missing, so it must be the missing product.

This is a <u>single displacement reaction</u> because one element that was in a pair was replaced by another.

All single displacement reactions look like this:

AB + C = AC + B          An element that was paired up switched places with another element that was not paired up.

In this reaction, "Be" was displaced. It started the reaction paired up with "F", but it was replaced by "Mg".

3 0
3 years ago
Read 2 more answers
How far is the milkyway to the earth
garik1379 [7]

About 100,000 light years

7 0
3 years ago
sample of CaCO3 was heated cause causing it to form CA Oh and CO2 gas solid CAO remains behind while does CO2 escaped to the atm
OleMash [197]

<u>Answer:</u> The mass of carbon dioxide formed in the reaction is 269 grams.

<u>Explanation:</u>

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side.

The chemical equation for the decomposition of calcium carbonate follows:

CaCO_3\rightarrow CaO+CO_2

Let the mass of carbon dioxide be 'x' grams

We are given:

Mass of calcium carbonate = 612 grams

Mass of CaO = 343 grams

Total mass on reactant side = 612 g

Total mass on product side = [343 + x] g

So, by applying law of conservation of mass, we get:

612=343+x\\\\x=(612-343)=269g

Hence, the mass of carbon dioxide formed in the reaction is 269 grams.

8 0
3 years ago
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