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3 years ago

You may not want to wear a black shirt in the hot summer because light is

Chemistry

1 answer:

oksano4ka [1.4K]3 years ago

8 0

Answer:

The outer layer of fabric does get hotter because the black color absorbs more heat. And that heat doesn't get transmitted to the skin because of the thick fabric. But thin black clothing transmits that heat to the skin, making a person hotter.

Explanation:

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Why is unit of pressure called a derived unit ?? 2) how do you measure the volume of milk?<br>

trasher [3.6K]

1. Unit of pressure called a derived unit because it is a combination of base units (kg·m^-1·s^·2).

2. We measure the volume of milk by a instrument called Milk Lactometer.

4 0

3 years ago

The liquids having same boiling point cannot be seperated from its mixture by distillation, why?

slavikrds [6]

Answer:

Explanation:

They cannot be separated by distillation since it depends on a liquid's ability to boil at a certain temperature. If you have two liquids with the same boiling temperatures, the proportion of each in the vapor phase will be about equal, making it impossible to separate them. Although they presumably do not have the same freezing point, you might use a different method like chromatography or work with their freezing points instead. You could then selectively crystallize one component while leaving the other as a pure liquid.

____________

Definitions:

Distillation:

#1: The volatilization or evaporation and subsequent condensation of a liquid, as when water is boiled in a retort and then the steam is condensed in a cool receiver.

4 0

2 years ago

Read 2 more answers

Senyawa apa saja yang terkandung di dalam minyak bumi?

liraira [26]

Answer:

go to brainly.in

Explanation:

4 0

3 years ago

Read 2 more answers

The alliance to save energy seeks to increase energy efficiency through _______. a. petitioning consumers to change their habits

TEA [102]

The alliance to save energy seeks to increase energy efficiency through: b. lobbying for policy changes.

<h3> Who is a lobbyist?</h3>

A lobbyist can be defined as an activist whose endeavor and intent is to persuade government officials to enact laws and policies (legislation) that would significantly benefit their group at large.

This ultimately implies that, the alliance to save energy seeks to increase energy efficiency through lobbying for policy changes by gaining access to legislative and executive arms of government, in a bid to influence their thought process.

Read more on lobbying here: brainly.com/question/16577797

#SPJ4

6 0

2 years ago

How many grams of Na2s do we need to dissolve in 200ml of water to get a solution that is 0.2 M?

DochEvi [55]

We know that the molarity of a solution is calculated by the following equation:

$Molarity = \frac{# moles}{L}$

That being said we are given two of the 3 things that we need: Volume of water, as well as the molarity of the solution. Let's plug those in to the equation to find how many moles of $Na_{2}S$ that we need:

$0.2 M = \frac{moles}{0.2 L}$ => $moles =0.04$

This means that we have 0.04 moles of $Na_{2}S$ .

In order to calculate the number of grams that we need for this solution, we must first calculate how many grams of $Na_{2}S$ are in 1 mole. We do this by taking the atomic masses of each element from the periodic table and adding them together.

Na = 22.99 g
S = 32.06 g

We have 2 Na's, and we have 1 S. So lets add them together:

2(22.99) + (32.06) = $\frac{78.04g}{mol}$ .

Since we need 0.04 moles of $Na_{2}S$ , we can multiply the molar weight of the molecule times the amount of moles needed to find the total grams that we need for the solution:

$\frac{78.04g}{mol}*0.04 moles = 3.1216 g$

Now we know that in order to make a 0.2 M solution of $Na_{2}S$ , we must use 3.1216 grams.

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4 years ago