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dmitriy555 [2]
3 years ago
11

What are the advantages of an electromagnet? PLEASE ANSWER!!

Chemistry
1 answer:
suter [353]3 years ago
5 0

Answer:

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field

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Determine the number of significant in 400
Leya [2.2K]

Answer:

400 or 4x102 indicates only onesignificant figure. (To indicate that the trailing zeros are significant a decimal point must be added. 400. has threesignificant digits and is written as 4.00x102 in scientific notation.) Exact numbers have an infinite number of significant digits but they are generally not reported.

6 0
4 years ago
Electronegativity is best described as
Alexxandr [17]
The Answer Is C, Hope It Helps
6 0
3 years ago
The total number of valence electrons in the phosphate ion is
Vitek1552 [10]

Answer:

32

Step-by-step explanation:

There are two ways you can count the valence electrons.

A. From the Periodic Table

1 × P (Group 15)               =   5

4 × O (Group 16) = 4 × 6 = 24

+3 e⁻ (for the charges)   = <u>  3</u>

                              Total = 32

B. From the Lewis structure

In the <em>Lewis structure</em> (below), each line (bond) represents a pair of bonding electrons, and each dot represents an unbound electron (half a lone pair).

5 lines (bonds)                    = 5 × 2 = 10

3 single-bonded O atoms = 3 × 6 = 18

1 double-bonded O atom              = <u>  4</u>

                                              Total = 32

4 0
4 years ago
The process in which an organic acid and an alcohol react to form an ester and water is known as esterification. Ethyl butanoate
Daniel [21]

Answer:

696g

Explanation:

To determine the mass of ethylbutanoate produced, it is important that we know the number of moles of ethylbutanoate produced.

Now from the chemical equation, it can be seen that one mole of ethanol produces one mole of ethylbutanoate. This means that 6.0 mol of ethanol will surely produce 6.0 mol of ethylbutanoate.

Now, we need to get the mass of ethylbutanoate produced. The mass of ethylbutanoate produced is the number of moles of ethylbutanoate produced multiplied by the molar mass of ethylbutanoate produced.

The molar mass of ethylbutanoate is 12(6) + 12(1) + 16(2) = 116g/mol

The mass thus produced is 116 * 6 = 696g

3 0
4 years ago
Joseph divides 8.64 by 2.0. How many significant figures should his answer have?
valina [46]
The answer should have B.) Two significant figures. This is because in a division problem, the number of significant figures in the answer is determined by the least number of significant figures. In this case, 2.0, which has 2 significant figures.
7 0
4 years ago
Read 2 more answers
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