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3 years ago

PLS HELP THIS IS URGENT LIKE AN ASPA QUESTION THAT NEEDS AND ANSWER PLS HELP

2 answers:

7 0

40% at wave lengths of infrared (IR) or longer. 50% at visible wave lengths and 10% at wave lengths of ultra violet (UV) or shorter.
I hope this is what you were asking.

Rudiy273 years ago

4 0

I’m pretty sure it’s 80% i had the same question when i did an exam and i got it right so yeah

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Balance each of the following redox reactions occurring in basic solution.MnO−4(aq)+Br−(aq)→MnO2(s)+BrO−3(aq)Express your answer

Ahat [919]

Answer : The balanced chemical equation is,

$2MnO_4^-(aq)+Br^-(aq)+H_2O(l)\rightarrow 2MnO_2(s)+BrO_3^-(aq)+2OH^-(aq)$

Explanation :

Rules for the balanced chemical equation in basic solution are :

First we have to write into the two half-reactions.
Now balance the main atoms in the reaction.
Now balance the hydrogen and oxygen atoms on both the sides of the reaction.
If the oxygen atoms are not balanced on both the sides then adding water molecules at that side where the more number of oxygen are present.
If the hydrogen atoms are not balanced on both the sides then adding hydroxide ion $(OH^-)$ at that side where the less number of hydrogen are present.
Now balance the charge.

The half reactions in the basic solution are :

Reduction : $MnO_4^-(aq)+2H_2O(l)+3e^-\rightarrow MnO_2(s)+4OH^-(aq)$ ......(1)

Oxidation : $Br^-(aq)+6OH^-(aq)\rightarrow BrO_3^-(aq)+3H_2O(l)+6e^-$ .......(2)

Now multiply the equation (1) by 2 and then added both equation, we get the balanced redox reaction.

The balanced chemical equation in a basic solution will be,

$2MnO_4^-(aq)+Br^-(aq)+H_2O(l)\rightarrow 2MnO_2(s)+BrO_3^-(aq)+2OH^-(aq)$

8 0

3 years ago

When a sample of gas is cooled, it condenses into a liquid. In which of the following ways do the molecules of the original gas

Amanda [17]

<span>c. The molecules are closer together as a gas than they do as a liquid.</span>

3 0

4 years ago

U peus

mote1985 [20]

Gases

Explanation:

Gases are the highly compressible states of matter made up of tiny particles that are moving independently of one another and are present in large quantities on the earth surface.

There are three states of matter which are solid, liquid and gas.

The particles of a gas are very far apart and are held together by very weak attractive forces.
In a gas, the molecules are in continuous, random, straight -line motion
They are easily compressible due to the weak attraction between them.

Learn more:

State of matter brainly.com/question/10972073

#learnwithBrainly

7 0

3 years ago

In France, grapes are 1.75 Euros per kilogram. What is the cost of grapes in dollars per pound if the exchange rate is 1.36 doll

Jet001 [13]

You want to convert Euros / kg to Dollars / pound

So you'll have to multiply the price (Euros / kg) by the exchange rate (Dollars / Euro) to get a number that has units of Dollars / kg.

Euros Dollars Dollars

------- x --------- = --------

kg Euro kg

Then you have to multiply the number of kg in a pound (which has units of kg / pound) to get a number in units of Dollars / pound. This number is 2.2.

Dollars kg Dollars

-------- x -------- = --------

kg pound pound

So the answer would be 1.75 * 1.36 / 2.2 = 1.08 dollars / pound.

3 0

3 years ago

Scientific laws differ from scientific theories because laws do not provide

Leni [432]

A) a hypothesis hope it helped :)

3 0

3 years ago