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3 years ago

Which activity would be an appropriate first step when designing an experiment?

2 answers:

8 0

I think you are talking about the Scientific Method. The first step is to Ask A Question.

Here's what you do next:
2. Research.
3. Make a hypothesis.
4. Experiment while controlling variables.
5. Analyze data and make a conclusion.
6. Communicate your findings.

(If the experiment doesn't work, try, try again!)

8_murik_8 [283]3 years ago

6 0

The appropriate initial step when you design an experiment is number (2). It is doing research about the problem utilizing information from different reliable sources. Among all the choices, this is the first step that should be done because you have to know everything about the problem first before the other 3 steps are done.

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PLEASE ANSWER “Tessa uses a toy slingshot to launch a tennis ball across the park for her dog to fetch. For her first launch, sh

Inessa05 [86]

The third launch ( with 300 N force) had the greatest acceleration of the tennis ball

<h3>Further explanation </h3>

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object

∑F = m. a

$\large{\boxed{\bold{a=\frac{\sum F}{m}}}$

F = force, N

m = mass = kg

a = acceleration due to gravity, m / s²

From the above equation it has been shown that the force acting on the object is directly proportional to its acceleration, so <em>the greater the force exerted on the object, the greater the acceleration of the object produced.</em>

8 0

2 years ago

Carbon diselenide (CSe2) is a liquid at room temperature. The normal boiling point is 125°C, and the melting point is –45.5°C. C

Tema [17]

Answer:

Explanation: The strengths of the inter molecular forces varies as follows -

$CO_{2}< CS_{2} < CSe_{2}$

The normal boiling point of CSe2 is 125°C and that of CS2 is 116°C, which explains the trend that as we move down the group, the boiling point of e compound increases as the size increases.

This usually happens because larger and heavier atoms have a tendency to exhibit greater inter molecular strengths due to the increase in size . As the size increases, the valence shell electrons move far away from the nucleus, thus has a greater tendency to attract the temporary dipoles.

And larger the inter molecular forces, more tightly the electrons will be held to each other and thus more thermal energy would be required to break the bonds between them.

5 0

3 years ago

Which ion in the ground state has the same electron configuration as an atom of neon in the ground state?

Ainat [17]

Cl-

Lets see how

Z for Cl is 9
One electron is added so new Z=10

Electronic configuration

1s²2s²2p⁶

[Ne]

option B is correct

6 0

1 year ago

Read 2 more answers

How many valence electrons does the Lewis structure for a chlorine atom show

ohaa [14]

Answer: D

Explanation:

Chlorine is in group 7 or (VII) in Roman numerals, which means it has 7 balance electrons. It only needs one electron to become stable, hence it is next to the noble gases

6 0

3 years ago

Read 2 more answers

What is the mole fraction, x, of solute and the molality, m (or b), for an aqueous solution that is 19.0% naoh by mass?

Bond [772]

We will assume that the solvent is water. So, if we have 100 grams of the solution, 19 grams will be sodium hydroxide, while the remaining 81 grams will be water.

The molar weight of sodium hydroxide, NaOH, is 40. The molar weight of water is 18. Finding the moles of each:

NaOH:
19 / 40 = 0.475

Water:
81 / 18 = 4.5

Total moles present:
4.5 + 0.475 = 4.975 moles

The mole fraction of NaOH is:
0.475 / 4.975 = 0.0955

The mole fraction of NaOH is 0.0955

5 0

2 years ago