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3 years ago

Which of the following is a scientific question about the cuttlefish?

Chemistry

2 answers:

Svetach [21]3 years ago

8 0

The answer is A. How does the cuddle fish change its colors ?

Ymorist [56]3 years ago

6 0

Answer: A. How does the cuttlefish change its colors?

Explanation:

A scientific question can be define as the fact finding inquiry. Asking a scientific question forms the part of the scientific method (which involves making an observation, asking a question, developing a hypothesis, testing the hypothesis on the basis of experimental procedures, analyzing the data and drawing the conclusion). A good scientific question should be answerable by using scientific methodology or by direct observation.

A. is the correct option, this is because of the fact that color is an observable variable. The change in variable can be observed and recorded to answer this question.

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The period of an osciller is 2.34 minutes. What id the frequency of this oscillator in hertz?

AleksAgata [21]

Explanation:

Given parameters

Period = 2.34minutes

Unknown:

Frequency of the oscillator = ?

Solution:

Frequency is the number of waves that passes through a point at a given time. It is the inverse of period which is the time it takes for a wave to pass through a medium:

F = $\frac{1}{T}$

F is the frequency

T is the period

To solve this, convert the period to seconds:

2.34minutes to seconds:

1 min = 60seconds

2.34 = 60 x 2.34 = 140.4s

F = $\frac{1}{140.4}$ = 0.007hz or 0.007s⁻¹

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3 years ago

How is a new moon the same as or different from a total lunar eclipse

yarga [219]

Explanation:

Both new moon and lunar eclipse occur when the moon is in the same plane the sun and the earth. However, both are different because of the relative position of the moon in its orbit – relative to earth. In a new moon, the moon is in between the earth and the sun, while in a lunar eclipse, the earth us in between the moon and the sun.

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3 years ago

SYNTHESIS OFCARBONATECTIONLABORATORY SIMULATIONLab Data- X99.00.10CollectedVolume sodium carbonate (mL)Molarity sodium carbonate

evablogger [386]

Answer:

$\begin{gathered} \text{Limiting Reagent = Sodium Carbonate} \\ \text{Percent Yield = 98\%} \end{gathered}$

Explanation:

The chemical reaction talks about the synthesis of calcium carbonate

It is from the reaction between sodium carbonate and calcium chloride

Let us write the equation of reaction as follows:

$Na_2CO_{3(aq)}+CaCl_{2(aq)}\text{ }\rightarrow2NaCl_{(s)\text{ }}+CaCO_{3(aq)}$

Firstly, we want to get the expected mass of calcium carbonate

This speaks about getting the theoretical yield based on the equation of reaction

From the data collected, 90 ml of 0.20 M (mol/L) of sodium carbonate gave calcium carbonate

We need to get the actual number of moles of sodium carbonate that reacted

We can get this by multiplying the volume by the molarity (kindly note that we have to convert the volume to Liters by dividing by 1000)

Thus, we have it as:

$\frac{90}{1000}\times\text{ 0.1 = 0.009 moles}$

Hence, we see that 0.009 moles of sodium carbonate reacted theoretically

Since 1 mole of sodium carbonate gave 1 mole calcium carbonate, it is expected that 0.009 mole of sodium carbonate will give 0.009mole of calcium carbonate

What we have to do now is to get the theoretical grams of calcium carbonate produced

That would be the product of the number of moles of calcium carbonate and its molar mass

The molar mass of calcium carbonate is 100 g/mol

The theoretical yield (expected mass) is thus:

$100\text{ g/ mol }\times\text{ 0.009mol = 0.9 g}$

Finally, we proceed to get the percentage yield which is calculated using the formula below:

$\text{Percent Yield = }\frac{Actual\text{ yield}}{\text{Theoretical yield}}\times\text{ 100 \%}$

The actual yield is the observed mass which is given as 0.88 g

The percent yield is thus:

$\frac{0.88}{0.9}\times\text{ 100 = }98\text{ \%}$

7 0

1 year ago

What is the formula of the ionic compound expected to form between the elements cl and al?

patriot [66]

Ionic compounds are those compounds which are made up of ions. These ions can exist as positive or negative ions. Those ions which has tendency to lose electrons are said to be cations (positive ions) such as metals and those ions which has tendency to gain electrons are said to be anions (negative ions) such as non-metals.

The formula for ionic compounds are given as:

First, the symbols of the cation and anion should be identified. After that, charge on the cation and anion should be identified. Write the chemical formula with the help of drop and swap method.

Now,

The chemical symbols for Aluminium is $Al$ and for chlorine is $Cl$ .

The charge on $Al$ is +3 and on $Cl$ is -1, neglect the positive and negative signs and by using drop and swap method i.e. the charge on the aluminium will go as a subscript of the chlorine and the charge on the chlorine will go as a subscript of the aluminium which is shown in the image.

Thus, the chemical formula between $Al$ and $Cl$ is $AlCl_{3}$ .

7 0

3 years ago

Equilibrium is characterized by

Hatshy [7]

Answer:

the thenhow to be my favorite you want to go don't think I love you too I don't think so ako wala load it out and then the words of the is being proud of you Fouck you Fouck

Explanation:

good morning I love you too baby girl women it's a

6 0

3 years ago