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Whitepunk [10]
3 years ago
6

Yosef is playing with different kinds of rubber bands. Some are very narrow and some are quite wide. Yosef is curious about the

rubber bands and develops the following scientific question: Does the width of a rubber band affect how easy it is to stretch it? He decides to develop a hypothesis to test this scientific question. What could Yosef’s hypothesis be?
Chemistry
2 answers:
Kamila [148]3 years ago
7 0
Yosef's hypothesis could be:
The larger the width of a rubber band, the harder it is to stretch it. 
oee [108]3 years ago
7 0
His hypothesis could be: A narrow rubber band is easier to stretch than a wider rubber band.
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In the reaction 2K + 2H2O→2KOH + H2 , which compound has an element ratio of 2:1 ?
Katyanochek1 [597]

Answer:

Option O = H₂O

Explanation:

Chemical reaction:

2K + 2H₂O   →     2KOH + H₂

In this balanced chemical equation we can see that water is the only compound that consist of two hydrogen atom and one oxygen atom. H : O

2 : 1 .

In case of KOH two hydroxyl and two potassium atom are present and ration is K:OH  1:1.

5 0
3 years ago
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What percentage of the mass of a carbon-12 atom is
Lynna [10]

Answer:

% of mass of electrons in C = 0.0272

Explanation:

Atomic no. of carbon = 6

So, no. of electron = 6

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% of mass of electrons in C = \frac{Mass\ of\ all\ electrons}{Mass\ of\ C}\times 100

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3 years ago
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3 years ago
Explain how heat would change the density of a parcel of air
BartSMP [9]
<span>Heat would make the molecules move faster so they would spread out therefore making air less dense.
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6 0
3 years ago
The molar volume of oxygen,O2, is 3.90 dm3 mol-1 at 10.0 bar and 200 degree centigrade. Assuming that the expansion may be trunc
schepotkina [342]

Answer:

B = - 0.0326 dm³/mol

Explanation:

virial eq until second term:

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∴ P = 10 bar * (atm/ 1.01325 bar) = 9.869 atm

∴ T = 200°C = 473 K

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4 0
3 years ago
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