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3 years ago

This step gives an investigation a specific direction or focus A.observation

Chemistry

2 answers:

frozen [14]3 years ago

5 0

The correct answer is c hypothesis

gayaneshka [121]3 years ago

5 0

Answer:

The correct answer will be option-C.

Explanation:

A scientific investigation is performed to answer and explain any natural phenomenon or event.

Any scientific investigation can be performed by following the scientific method which includes many sequential steps which begin with making an observation, asking a question, do background research, propose a hypothesis which can be tested with experiments.

The main focus of any scientific investigation begins after proposing a well educated guess called hypothesis. A hypothesis is constructed on the basis of previous work due to which it explains the phenomenon to a limited extent which has to be tested.

Thus, a hypothesis gives a direction and is the focus of a scientific investigation and is the correct answer.

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Which of the following reaction is NOT a step in the formation of sodium chloride

Yakvenalex [24]

Aspirin(3) was synthesized by esterification reaction of salicylic acid(1) with acetic anhydride(2) catalyzed by aluminum dihydrogen tripolyphosphate/loaded sulfur diatomite. The effects of materials ratio[r = n(2) ∶ n(1) ],reaction time,temperature and catalyst amount on the yield of 3were investigated by the single-factor experiments. The results showed that the four main factors influencing the yield of 3 are in the following order: r reaction time reaction temperature catalyst amount. Under the optimum reaction conditions[1 was 50 mmol,the catalyst amount was 5%,r was3. 14,at 81 ℃ for 40 min],the yield was 88. 6%. The yield still reach 83. 3% after reuse for five times of the catalyst

8 0

3 years ago

PLEASE ANSWER, I WILL GIVE BRAINLIEST AND THANKS!

zheka24 [161]

Answer:

Mass = 8 g

Explanation:

Given data:

Mass of MgO formed = 20 g

Mass of oxygen needed = ?

Solution:

Chemical equation:

2Mg + O₂ → 2MgO

Number of moles of MgO:

Number of moles = mass/molar mass

Number of moles = 20 g/ 40 g/mol

Number of moles = 0.5 mol

Now we will compare the moles of MgO and O₂ from balance chemical equation:

MgO : O₂

2 : 1

0.5 : 1/2×0.5 = 0.25 mol

Mass of oxygen required:

Mass = number of moles × molar mass

Molar mass of O₂ is 32 g/mol

Mass = 0.25 mol × 32 g/mol

Mass = 8 g

4 0

3 years ago

What is this process of producing more offspring than possibly survive called?

tamaranim1 [39]

Darwin's Theory of Evolution by Natural Selection.

Darwin divided this theory into multiple parts but overall it fits into Darwin's Theory of Evolution by Natural Selection, so that would be your answer.

In case you're wondering about the others:

1. Organisms produce more offspring than actually survive.

2. Every organism must struggle to survive.

3. There is variation within a species.

4. Some variations allow members of a species to survive and reproduce better than others.

5. Organisms that survive and reproduce pass their traits to their offspring, and the helpful traits gradually appear in more and more of the population.

(these are brief explanations, they go into more detail)

Good luck!

4 0

3 years ago

The sum of the protons and neutrons in an atom is its

Orlov [11]

The atomic mass is the sum of the protons and neutrons in an atom

7 0

3 years ago

Water is considered neutral and has a pH of:

Brums [2.3K]

Answer:

Water has a pH of 7 - its not acid or base (its neutral {in the middle})

Explanation:

Since the pH scale maximum number is 14, the middle number - is 7 - which is where water is

8 0

3 years ago