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Anika [276]
3 years ago
8

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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Find the density of an empty tissue box with a mass of 345 grams and a volume of 1125 cm3.
trasher [3.6K]

Answer:

The answer is

<h2>0.307 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}

From the question

mass of box is 345 g

volume = 1125 cm³

The density of the object is

density =  \frac{345}{1125}  \\  = 0.3066666...

We have the final answer as

<h3>0.307 g/cm³</h3>

Hope this helps you

4 0
3 years ago
Which of these is an example of a physical change? Question 9 options: paper burning wood decaying iron melting steel rusting
guajiro [1.7K]
Paper burning is a form of a physical change known as combustion. The chemical bonds in between atoms holding them together are being changed with the heat, making it different on an atomic level.
7 0
3 years ago
Igneous rock can _____ to form metamorphic rock.
Ne4ueva [31]

Hello,

Question- Igneous rock can _____ to form metamorphic rock.


A. melt


B. harden


C. heat up


D. weather

Answer- Your answer is C. Heat up

Why- Any rock can become any rock igneous metamorphic or even condemnatory just by heating up but when it melts it becomes lava and the rock cycle starts all over again.

Important- If my answer was enough to help uou please mark me as Brainliest, Leave a thanks, and Rate my answer 5 stars thank you and have the best day ever!

3 0
3 years ago
Read 2 more answers
Which experimental feature of the MALDI-MS technique allows the separation of ions formed after the adduction of tissue molecule
34kurt

Answer:

The experimental feature of the MALDI-MS technique which allows the separation of ions formed after the adduction of tissue molecules:

B) Velocity of ions depends on the ion mass-to-charge ratio.

Explanation:

  • The option a is not correct as distance traveled by ions doesn't depend upon the ion charge rather it depends upon time for which you leave the sample to run.
  • The  option b is correct as velocity of ions depends on the ion mass-to-charge ratio because separation is done due to mass to charge ratio feature.
  • The option c is incorrect as time of travel is not inversely proportional to the ion-to-mass ratio because the ion will move across the gel until you stop the electric field.
  • The option d is not correct as electric field between MALDI plate and MS analyzer is though uniform but this feature doesn't allow the separation of ions.

6 0
3 years ago
In an ionic bond, electrons are ___________________. Choose all the apply.
Rainbow [258]
In an ionic bond, electrons are transferred from one stone to another atom (shared).
4 0
2 years ago
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