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Shalnov [3]
3 years ago
11

Changing the pendulum design after the first trial was an example of _____________ to solve the problem presented by the teacher

. A) designing the model B) evaluating th e model C) identifying the problem D) doing research on the problem
Chemistry
2 answers:
docker41 [41]3 years ago
6 0

Answer:

C. identifying the problem

Explanation:

To be sure of what the experiment involves one need to have an hypothesis to guide the task.

Assuming the hypothesis in the experiment is , “changing the amount of weight at the end of the pendulum will change the period of the pendulum.”

The experiment design would be complementary in that it would entail measuring the period with just one amount of weight, then changing the weight without changing any other variables, then measuring the period with the new amount of weight.

Changing the pendulum design after the first trial was an example of identifying the problem or the variable tied to the one factor that we are solving for.

Luden [163]3 years ago
3 0

Answer:

Changing the pendulum design after the first trial was an example of <u>evaluating the model</u> to solve the problem presented by the teacher.

Explanation:

A model constitutes an abstract representation of a certain aspect of reality, and has a structure that is formed by the elements that characterize the aspect of the modeled reality and by the relationships between these elements.

This achieved result provides a better understanding of the problem being studied, offering aspects that can be changed or improved to solve the problem posed, obtaining more information about the reality of the phenomenon that is being represented.

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Part F
Pavlova-9 [17]

Answer: did you ever find the answer? I need part E, F, and G if you found them please!!!!! I’m begging, my school year ends in 30 minutes and I gotta get this submitted!!!!!!

Explanation:

7 0
2 years ago
3Fe + 4H2O Fe3O4 + 4H2
aalyn [17]
<span>These are five questions with its five answers.
</span><span>
</span><span>
</span><span>First, we have to explain main question.
</span>
<span /><span /><span>
</span><span>The statement provides the chemical equation for the reaction of Fe with water to produce iron(III) oxide and hydrogen.
</span>
<span /><span /><span>
</span><span>Fe3O4 is a weird chemical formula. It belongs to the product named oxoiron.
</span>
<span /><span /><span>
Next, I have to tell how you must interpret the question. The five questions are based on the complete reaction of the same number of moles as the coefficients indicated in the chemical equation.
</span><span />

<span>Those coefficients are 3 for Fe, 4 for H₂O, 1 for Fe₃O₄ and 4 for H₂.


With that understood, let's work every question.


1) How many molecules of H₂ are produced?


Answer: 4 moles of molecules.

</span><span>Justification:
</span>

<span /><span /><span>This is, the number of moles of H₂ produced is given by the coefficient indicated in the chemical equation.
</span><span />

<span>2) How many oxygen atoms are required?
</span><span />

<span>Answer: 4.

</span><span>This is, the atoms of oxygen are supplied in the molecules of water. Since the coeffcient of water is 4, and each molecule o fwater has 1 atom of oxygen, 4 moles of water contain 4 moles of atoms of oxygen.
</span>
<span /><span /><span>
3) How many moles of Fe₃O₄ are formed?
</span><span />

<span>Answer: 1.
</span><span />

<span>Justification: the coefficient of for formula Fe₃O₄ is 1, indicating that the theoretical yield is 1 mol of molecules.
</span><span />

<span>4) What is the mole ratio of Fe to H₂O?
</span><span />

<span>Answer: 3:4
</span><span />

<span>Justification:
</span><span>
</span><span>
</span><span>The ratio is the quotient of the two coefficients: the coefficient of the Fe divided by the coefficient of the H₂O.
</span>
<span /><span /><span>
5) How many hydrogen atoms are involved in this reaction?
</span><span />

<span>Answer: 8 moles of hydrogen atoms.
</span><span />

<span>Justification: as you can see each molecule of H₂O has 2 atoms of hydrogen, then 4 moles of molecules of H₂O have 8 moles of atoms of hydrogen. And of course the same number are in the produt: 4 moles of H₂ contain 8 moles of atomos of hydrogen
</span><span>
</span><span>
</span>
3 0
3 years ago
Read 2 more answers
Sodium hydrogen carbonate NaHCO3, also known as sodium bicarbonate or "baking soda", can be used to relieve acid indigestion. Ac
olga2289 [7]

Answer:

1.4952 grams of sodium bicarbonate she  would need to ingest to neutralize this much HCl.

Explanation:

Moles (n)=Molarity(M)\times Volume (L)

Moles of hydrochloric acid = n

Volume of hydrochloric acid solution = 200.0 mL = 0.200 L

Molarity of the hydrochloric acid = 0.089 M

n=0.089 M\times 0.200 L=0.0178 mol of HCL

HCl(aq)+NaHCO_3(aq)\rightarrow NaCl(aq)+H_2O(l)+CO_2(g)

According to reaction, 1 mole of HCl is neutralized by 1 mole of sodium bicarbonate.

Then 0.0178 moles of HCl wil be neutralized by :

\frac{1}{1}\times 0.0178 mol=0.0178 mol of sodium bicarbonate

Mass of 0.0178 moles of sodium bicarbonate:

0.0178 mol × 72 g/mol = 1.4952 g

1.4952 grams of sodium bicarbonate she  would need to ingest to neutralize this much HCl.

8 0
3 years ago
Functional group and bond hybridization of vanillin
lana66690 [7]

Vanillin is the common name for 4-hydroxy-3-methoxy-benzaldehyde.

See attached figure for the structure.

Vanillin have 3 functional groups:

1) aldehyde group:  R-HC=O, in which the carbon is double bonded to oxygen

2) phenolic hydroxide group: R-OH, were the hydroxyl group is bounded to a carbon from the benzene ring

3) ether group: R-O-R, were hydrogen is bounded through sigma bonds to carbons

Now for the hybridization we have:

The carbon atoms involved in the benzene ring and the red carbon atom (from the aldehyde group) have a <u>sp²</u> hybridization because they are involved in double bonds.

The carbon atom from the methoxy group (R-O-CH₃) and the blue oxygen's have a  <u>sp³</u>  hybridization because they are involved only in single bonds.

7 0
3 years ago
Could you please help
Semenov [28]
I would say D, because you need to start with nothing to measure the different sizes as they start to grow. hope this helps!
8 0
3 years ago
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