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Anuta_ua [19.1K]
2 years ago
15

Help i know whofkfkfkf

Chemistry
1 answer:
Irina18 [472]2 years ago
7 0

<u>A</u><u>n</u><u>s</u><u>w</u><u>e</u><u>r</u><u>:</u><u>-</u>

1. A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. ... Elements that compose the compound are chemically combined. Elements contain only one type of atom.

2. Two ways to add energy to break down a compound are to apply heat and to apply an electric current.

3. The compound composed of these ions exhibits properties entirely different from the properties of the elements sodium and chlorine. Chlorine is poisonous, but sodium chloride is essential to life; sodium atoms react vigorously with water, but sodium chloride simply dissolves in water.

4. In chemistry, the law of definite proportion, sometimes called Proust's law, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.

5. compounds and elements.

6.Solid nonmetals

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8. What volume (ml) of a 5.45 M lead nitrate solution must be diluted to 820.7 ml to make a
Ganezh [65]

212 ml of lead nitrate is required to prepare a dilute solution of 820.7 ml of lead nitrate.

Answer:

Option A.

Explanation:

Similar to Avagadro's law, there is another law termed as dilution law. As the product of volume and normality of the reactant is equal to the product of volume and normality of the product from the Avagadro's law. In dilution law, it will be as product of volume and concentration of the solute of the reactant is equal to the product of volume and concentration of solution.

C_{1} V_{1} =C_{2} V_{2}

So, as per the given question C1 = 5.45 M of lead nitrate and V1 has to be found. While C2 is 1.41 M of lead nitrate and V2 is 820.7 ml.

Then, (5.45*V_{1} ) = (820.7*1.41)

V_{1}=\frac{820.7*1.41}{5.45}=  212.33 ml

So nearly 212 ml of lead nitrate is required to prepare a dilute solution of 820.7 ml of lead nitrate.

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2 years ago
What do you think will happen to the chipmunk population over the next five years(2001-2011)​
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Answer:they will out live us himans

Explanation:

7 0
3 years ago
Use the conversion factor 1 amu = 1.66054× 10–24 g to answer the following questions. a) 1.67 x 10-24 g of neurons is how many (
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You can use the mass of neuron divided by the mass of conversion factor: 1.67*10^(-25)/(1.66054*10^(-24))≈1 amu. So the answer is 1 amu. 
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What is the error in the electron configuration, 1s2 2s2 2p6 3s2 3p5 4s2?
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1s2 2s2 2p6 3s2 3p6 4s1

s orbital can hold 2 electron
p orbitals can hold 6 electron
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All organic compounds have at least ____ carbon and two ____
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All organic compounds have at least 1 carbon and 2 hydrogen atoms.
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