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MrMuchimi
3 years ago
7

Humans started using elemental copper about 6000 years ago and started using elemental tin about 3800 years ago. Use the heat of

formation values for copper C (II) oxide and tin (IV) oxide to help explain why humans were able to use elemental copper before they were able to use elemental tin.
Chemistry
1 answer:
Elis [28]3 years ago
5 0

Answer:

As the Tin has "lousy properties," humans can use copper before tin.

Explanation:

Heat of formation of the copper (II) oxide = -156KJ/mol

Heat of formation of Tin (IV) oxide =-581KJ/mol

As, we know that the copper will form the copper oxide after receiving reduced energy. Humans were able to use the elemental copper before tin. And also, tin has itself the lousy properties as compared to Copper. Copper are also the good conductor of heat, hence they are used in the electric wiring. Apart, from that it is also being used for roofing and plumbing. And as heat exchangers in the industries Copper also possess the antibacterial property.

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A 25 Ω resistor has a voltage drop of 12 V across it. Calculate the current flowing through the resistor
Yanka [14]

Answer:

0.48

Explanation:

i =  \frac{v}{r}

because we are looking for I which is current we say

I = 12÷25 which is 0.48.

4 0
3 years ago
16. The Nile River is a(n)<br> 16.<br> a. Old river<br> b. Mature river<br> C. Young river
horrorfan [7]

Answer:

I think it's a old river

Explanation:

4 0
3 years ago
What is the molarity of a solution of 0.2 moles of Potassium Oxide
egoroff_w [7]

The molarity of a solution : 0.4 M

<h3>Further explanation</h3>

Given

0.2 moles of Potassium Oxide

500 ml of water = 0.5 L

Required

The molarity

Solution

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}

Assume volume of solution = volume of water(addition of solution volume from volume Potassium Oxide is negligible

Input the value :

M = 0.2 : 0.5

M = 0.4

3 0
3 years ago
What is a thermal insulation material that is no longer used because of formaldehyde gas emission?
Ludmilka [50]

Urea Formaldehyde Foam Insulation is the thermal insulation material that is no longer used because of formaldehyde gas emission

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It is no longer used because it caused a raise in the formaldehyde gas in the residence. This gas caused irritations to the people living in the building. Residents started to report health issues like respiratory problems, and eyes, nose, throat irritation.

If you need to learn about the formaldehyde gas, click here.

brainly.com/question/14645797?referrer=searchResults

#SPJ4

7 0
2 years ago
I need help I need the answer ASAP.
kramer
The answer you selected in the picture is correct!
7 0
3 years ago
Read 2 more answers
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