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3 years ago

What type of star has an absolute brightness of 5 and a surface temperature around 3,000 °C?

Chemistry

2 answers:

NikAS [45]3 years ago

7 0

Answer : The correct answer is option A : Supergiants

Explanation :

In the above graph absolute brightness is marked on y-axis and surface temperature is marked on x-axis.

To find out what type of star has an absolute brightness of 5 and a surface temperature around 3,000 °C, we will draw a straight line from x axis which represents a temperature of 3,000 °C and another straight line from y-axis which represents absolute brightness of 5.

From the attached graph we can see that these 2 lines meet in the region shown by Supergiants

Therefore we can say that, Supergiants has an absolute brightness of 5 and a surface temperature around 3,000 °C

pav-90 [236]3 years ago

3 0

From the graph. the answer is
A. supergiants

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fenix001 [56]

The symbol %v/v means percent by volume. Assuming there is no volume effects when these substances are mixed, we calculate as follows:

% v/v = (25 mL ethanol / 25 mL + 150 mL ) x 100
%v/v = 14.29 mL ethanol / mL solution

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3 years ago

How many grams of MgCl2 would be needed to make 5.3 liters of a 0.25 molar solution? Round your answer to the nearest 0.01,

GuDViN [60]

Answer: 126.1 grams of are needed to make 5.3 L of 0.25 M solution

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

To calculate the mass of solute for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{given mass of solute}}{\text {Molar mass of solute}\times \text{Volume of solution in L}}$

$0.25M=\frac{x}{95.2g/mol\times 5.3L}$

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6 0

2 years ago

What is the formula for sodium bromide

Dominik [7]

Answer:

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Explanation:

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3 years ago

Read 2 more answers

If an international student returns to her country of origin and works for an MNE whose headquarters is in the country where she

shutvik [7]

Answer:

B. HCN

Explanation:

PCN stands for Parent Country National. A PCN is an individual who is working in the country other than his or her native or origin country.

HCN stands for Host Country National. A HCN is the employee of the organization who is a citizen of the country where the foreign subsidiary is been located.

TCN stands for Third Country National. A TCN is an individual of other nation who is hired by a government who represents neither his host country or the government.

Hence in the context, a person who returns to his native country and works at an MNE which have its headquarter in the country where the individual studied is termed as a Host Country National or HCN.

Thus the correct option is (B).

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3 years ago