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nata0808 [166]
3 years ago
10

What is an ore? an object that has been recycled an article of clothing that is made from natural fiber a rock that contains eno

ugh of a metal to be worthwhile to extract a fossil fuel that can be burned to generate electricity
Chemistry
2 answers:
grin007 [14]3 years ago
7 0

Answer:

C. A rock that contains enough of a metal to be worthwhile to extract.

Explanation:

Just did the assignment.

worty [1.4K]3 years ago
4 0

Answer: A rock that contains enough of a metal to be worthwhile.

Explanation:

An ore is a rock which is extracted by the process of mining. This can be purified from gangue and other particles to extract metallic minerals. A metallic mineral can be of low to high economic value.

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How many gallons of gasoline that is 5% ethanol must be added to 2,000 gallons of gasoline with no ethanol to get a mixture that
Amanda [17]

Answer:

V_1= 3000 gal

Explanation:

We have 3 solutions:

  • Solution 1 (with ethanol)
  • Solution 2 (no ethanol)
  • Final solution

V_f=V_1 + V_2

and for the ethanol:

V_f*0.03=V_1*0.05 + V_2*0

V_f=V_1 \frac{5}{3}

Combining:

V_1 \frac{5}{3}=V_1 + V_2

V_1 \frac{2}{3}= V_2

V_1= \frac{3}{2} V_2

If V2=2000 gal:

V_1= \frac{3}{2} 2000 gal

V_1= 3000 gal

8 0
3 years ago
What would be the minimum energy Emin required to excite a hydrogen atom from its lowest energy level
Wewaii [24]

The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

<h3>What is excitation?</h3>

The term excitation has to do with the promotion of an electron from a lower to a higher energy level.

In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

Learn more about energy level:brainly.com/question/17396431

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3 0
2 years ago
Which atom would be expected to have a half-filled 6s subshell
eduard

Answer: I think the answer is Cesium (Cs)

Explanation:

A half-filled 6s subshell would be 6s^1

4 0
3 years ago
Which of the following best describes the relationship between cells in living things in general?
vfiekz [6]
The answer is b all living thing are
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jolli1 [7]

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a i think but idk

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