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sp2606 [1]
3 years ago
11

Which elements do hydrogen fuel cells combine to produce electricity? (9TH GRADE SCIENCE)

Chemistry
1 answer:
Andrej [43]3 years ago
5 0
<span>it will convert the energy produced by a chemical reaction into usable electric power.</span>
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Addition reactions of alkenes are characterized by _________. A) formation of a bond B) addition of two groups across a double b
mr_godi [17]

Answer:

B. ADDITION OF TWO GROUPS ACROSS A DOUBLE BOND

Explanation:

Addition reaction of alkenes involves the conversion of the double bond in alkenes Inyo single bonds by the addition of two groups of atoms or radicals.

During this addition reaction, two substances, an unsaturated compound(e.g. ethane) and an attacking reagent (hydrogen, halogens, hydrogen halides, chlorine and bromine water) combines to form a single new compound without forming any other products. So a saturated product or one in which is an increase in degree of saturation is formed.

7 0
3 years ago
Which of the following properties of an unknown substance would allow it to be classified as a mixture? The unknown substance
Nadya [2.5K]

Answer:

D. has different properties when sampled in different areas.

Explanation:

The general property of a mixture says that each substance or component in a mixture has its individual or different property which can be separated on the basis of different methods.

Such as a mixture of oil and water is a heterogeneous mixture and have different properties or different densities, which helps them to be sampled in different areas.

Hence, the correct answer is "D".

6 0
3 years ago
What is the pH of a solution with a concentration of 4.7 × 10-4 molar H3O+?
wlad13 [49]
The pH of a liquid substance is calculated through the equation,
                                       pH = -log[H3O+]
Substituting the given concentration of the hydronium ion to the equation above,
                                        pH = -log[4.7x10^-4 M]
The value of pH is equal to 3.33. Thus, the pH of the solution is approximately 3.33. 
3 0
3 years ago
Can anyone answer this?? Thanks in advance <br><br> AlCl3 + Cu = ?
Kazeer [188]
Reaction won't occur
Because the activity of Cu is less than Al
3 0
3 years ago
Hello!! I need help please! Please explain how I can identify a percipitate in a reaction! I need help with chemistry ha
antiseptic1488 [7]
Generally speaking a precipitate is something that will form as a result of the reaction.  It generally is a solid material.

Sodium and nitrates are soluble so Calcium Phosphate would precipitate out....


5 0
3 years ago
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