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Studentka2010 [4]

3 years ago

14

Water bugs walk on water, some razor blades can float on water, and water forms droplets. Are these examples of viscosity, surfa

ce tension, or vapor pressure?
A. Viscosity
B. Vapor pressure
C. Surface tension

1 answer:

Anton [14]3 years ago

6 0

C.) Surface Tension, Because water can hold a certain amount of pressure/weight before the object sinks

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14. Why does a sea breeze blow from the ocean toward the shore?

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A. The breeze blow from higher pressure over the water to the lower

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Why does it seem to us as if rocks remain the same and don't change

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Most rocks that we encounter in our normal everyday lives are sedimentary rocks. Sedimentary rocks are rocks that have been worn down gradually over long periods of time. Because it takes very long periods of time (couple decades) for these rocks to change, it often seems as if they don't change at all, when in reality the change is too small for us to realize it!

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3 years ago

The phase of matter can be changed by:

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3 years ago

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If you have 3 moles of a gas at a pressure of 2.5 atm and a volume of 8 liters, what is the temperature?

fomenos

Answer:

d

Explanation:

pv=nrt

2.5×1.01×10^5×8×10^-3=3×8.31×T

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2 years ago

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One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal

kenny6666 [7]

Answer:

Lithium oxide, Li₂O.

Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

$M_2O+H_2\rightarrow 2M+H_2O$

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

$5.00gM_2O*\frac{1molM_2O}{(2*X+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{XgM}{1molM}=2.32gM$

Thus, we perform the operations in order to obtain:

$\frac{10X}{(2X+16)}=2.32$

So we solve for x as shown below:

$10X=2.32(2X+16)\\\\10X=4.64X+37.12\\\\X=\frac{37.12}{10-4.64}\\\\X= 6.93g/mol$

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

Best regards!

8 0

3 years ago