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2 years ago

Many organisms on Earth exhibit similar ____________.

Chemistry

2 answers:

sukhopar [10]2 years ago

3 0

Characteristics is the correct answer!

Jlenok [28]2 years ago

3 0

Answer:

characteristics

Explanation:

i promise becasue i am a teacher so i hope you like it

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Which metal is more active than H2?<br> (1) Ag (3) Cu<br> (2) Au (4) Pb

astraxan [27]

Answer is (4) - Pb.

According to the reactivity series of elements

- the elements which are above the hydrogen are more reactive than hydrogen.

- the elements which are below the hydrogen are less reactive than hydrogen.

Among the given choices, only Pb is placed above the hydrogen in the reactivity series and rest are below the hydrogen.

Hence, Pb is more active than hydrogen.

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3 years ago

The molecular weight of acetic acid is

kolezko [41]

Answer:

60.052 grams per mole

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In the Lewis structure for a molecule, one of the nitrogen atoms shares six electrons with a carbon atom and has two electrons t

lutik1710 [3]

Answer: option D. triple bond and one lone pair

Explanation:

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2 years ago

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Answer:

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3 years ago

When a lead acid car battery is recharged by the alternator, it acts essentially as an electrolytic cell in which solid lead(II)

lesya692 [45]

Answer: The mass of lead deposited on the cathode of the battery is 1.523 g.

Explanation:

Given: Current = 62.0 A

Time = 23.0 sec

Formula used to calculate charge is as follows.

$Q = I \times t$

where,

Q = charge

I = current

t = time

Substitute the values into above formula as follows.

$Q = I \times t\\= 62.0 A \times 23.0 sec\\= 1426 C$

It is known that 1 mole of a substance tends to deposit a charge of 96500 C. Therefore, number of moles obtained by 1426 C of charge is as follows.

$Moles = \frac{1426 C}{96500 C/mol}\\= 0.0147 mol$

The oxidation state of Pb in $PbSO_{4}$ is 2. So, moles deposited by Pb is as follows.

$Moles of Pb = \frac{0.0147}{2}\\= 0.00735 mol$

It is known that molar mass of lead (Pb) is 207.2 g/mol. Now, mass of lead is calculated as follows.

$No. of moles = \frac{mass}{molar mass}\\ 0.00735 = \frac{mass}{207.2 g/mol}\\mass = 1.523 g$

Thus, we can conclude that the mass of lead deposited on the cathode of the battery is 1.523 g.

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2 years ago