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igor_vitrenko [27]
3 years ago
15

Water, H2O, is made up of different elements, hydrogen and oxygen. Is this type of combination a mixture or a pure substance? A)

Because water is composed of two separate elements, it is a mixture. B) Because water can be heated and fairly easily turned to steam, it is a mixture. C) Because water is composed of elements found in the periodic table, it is a pure substance. D) Because water molecules all have a consistent ratio of hydrogen to oxygen, it is a pure substance. E
Physics
2 answers:
strojnjashka [21]3 years ago
7 0

the correct answer is D i just got it on USATestPrep. Your welcome.

Ymorist [56]3 years ago
5 0

A pure substance is a substance with a consistent ration of the elements that make it up. This means that there is no way to tell one water molecule apart from the other. The atoms in a pure compound contain atoms bonded in the same way throughout the compound.

On the other hand, a mixture  has constituents that have different pure substances mixed together. The constituents of a mixture are easy to distinguish from each other.

With these definitions in mind, we can easily see that water is a pure sustenance because water molecules all have a consistent ratio of hydrogen to oxygen atoms.

The correct answer for this question is D)Because water molecules all have a consistent ratio of hydrogen to oxygen, it is a pure substance.

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3 years ago
A point charge q1 is held stationary at the origin. A second charge q2 is placed at point a, and the electric potential energy o
likoan [24]

Answer:

U_{b}=+7.3*10^{-8}J

Explanation:

Given data

Electric potential at point a is Ua=5.4×10⁻⁸J

q₂ moves to point b where a negative work done on it  W_{a-b}=-1.9*10^{-8}J

Required

Electric potential energy Ub

Solution

When a particle moves from a point where the potential is Ua to a point where it is Ub the change in potential energy is equal to work done where the force exerted on the charge is conservative and work done is given by:

W_{a-b}=U_{a}-U_{b}\\U_{b}=U_{a}-W_{a-b}

Now  substitute the given values

So

U_{b}=5.4*10^{-8}J-(-1.9*10^{-8}J)\\U_{b}=+7.3*10^{-8}J

3 0
3 years ago
A solenoid of length 2.50 cm and radius 0.750 cm has 25 turns. If the wire of the solenoid has 1.85 amps of current, what is the
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Answer:

13.875 T

Explanation:

Parameters given:

Length of solenoid, L = 2.5 cm = 0.025 m

Radius of solenoid, r = 0.75 cm = 0.0075 m

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Current, I = 1.85 A

Magnetic field, B, is given as:

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Answer:

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Elena-2011 [213]

Answer:

1.23 m/s²

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Plug in:

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The runner's acceleration is 1.23 m/s².

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3 years ago
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