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3 years ago

Which element is found in nature only in compounds? A. sodium B. helium C. oxygen D. nitrogen

Chemistry

2 answers:

ozzi3 years ago

7 0

The element found in nature only in compounds is Sodium

Hoochie [10]3 years ago

7 0

Answer: Option (A) is the correct answer.

Explanation:

A compound is a substance which contains two or more different atoms combined together.

Sodium is found as sodium chloride in nature. Sodium chloride is also known as common salt.

As it contains a sodium atom combined to a chlorine atom, therefore, it is a compound.

Thus, we can conclude that sodium is the element that is found in nature only in compounds.

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2H2 + O2 --> 2H2O can be classified as what type of reaction?

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Combustion reaction
Key: O2
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3 years ago

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In 1865 a pond was surrounded by open fields today the same area is swampy and surrounded by a forest which process is responsib

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erosion

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The switch is used to ___________ or __________ an electrical circuit. When the switch is on, the circuit is __________ , and wh

Pani-rosa [81]

Answer:

The switch is used to disconnect or connect an electrical circuit. When the switch is on, the circuit is complete, and when the switch is off, the circuit is open. Electrical current exists in the circuit when it is closed, but when it is open, there is no electrical current in the circuit. The switch determines whether the circuit is open and closed.

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3 years ago

The concentrated sulfuric acid we use in the laboratory is 98.0% sulfuric acid by weight. Calculate the molality and molarity of

timama [110]

Answer : The molarity and molality of the solution is, 18.29 mole/L and 499.59 mole/Kg respectively.

Solution : Given,

Density of solution = $1.83g/cm^3=1.83g/ml$

Molar mass of sulfuric acid (solute) = 98.079 g/mole

98.0 % sulfuric acid by mass means that 98.0 gram of sulfuric acid is present in 100 g of solution.

Mass of sulfuric acid (solute) = 98.0 g

Mass of solution = 100 g

Mass of solvent = Mass of solution - Mass of solute = 100 - 98.0 = 2 g

First we have to calculate the volume of solution.

$\text{Volume of solution}=\frac{\text{Mass of solution}}{\text{Density of solution}}=\frac{100g}{1.83g/ml}=54.64ml$

Now we have to calculate the molarity of solution.

$Molarity=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{volume of solution}}=\frac{98.0g\times 1000}{98.079g/mole\times 54.64ml}=18.29mole/L$

Now we have to calculate the molality of the solution.

$Molality=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent}}=\frac{98.0g\times 1000}{98.079g/mole\times 2g}=499.59mole/Kg$

Therefore, the molarity and molality of the solution is, 18.29 mole/L and 499.59 mole/Kg respectively.

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3 years ago

Which scientific investigation describes a field study?

weqwewe [10]

Answer:

A. A scientist investigates a mouse's growth in nature by watching the animal.

A field study is a raw collection of data, typically in the natural habit of the organism; hence why an experiment taken in a lab isn't a field study.

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2 years ago