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4 years ago

Is air an element, compound or mixture? explain your answer

Chemistry

2 answers:

vfiekz [6]4 years ago

7 0

Mixture cuz it contains gases, water vapor, dust and microbes

emmainna [20.7K]4 years ago

3 0

It is a mixture because the compounds that make up air e.g. oxygen (o2), Carbon dioxide (co2) and the most important Nitrogen which is an element and makes up 78.09% of air are not chemically bound in the way that compounds are because they can be separated easily and there has been no change in state to any of the compounds or elements in air!hope this helpful!

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Which energy conversion occurs when a battery-operated alarm clock goes off?

jarptica [38.1K]

C is the most reasonable answer!

7 0

3 years ago

75. In Canada and the United Kingdom, devices that measure blood glucose levels provide a reading in millimoles per liter. If a

AfilCa [17]

Answer:

The answer to this is the concentration of glucose (C6H12O6) in mg/dL = 95.48 mg/dL

Explanation:

To solve this we list out the known variables thus

Measured concentration of glucose (C6H12O6) = 5.3mM per liter

The molar mass of glucose = 180.156 g/mol

From the above, it is seen that one mole of glucose contains 180.156 grams of C6H12O6 therefore 5.3 mM which is 5.3 × 10⁻³ moles contains

5.3 × 10⁻³ moles × 180.156 g/mol = 0.9548 grams of glucose

Also 1 d L = 0.1 L or 1 L = 10 dL and 1 mg = 1000 g, hence

thus 0.9548 grams per liter is equivalent to 1000/10 × 0.9548 milligrams per dL or 95.48 mg/dL

4 0

4 years ago

Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. nh4cl na3po4 li2

Pie

By using the formula of depression in freezing, it can easily identify the rank of the given compounds.

$\Delta T= i.K_{f}.m$

where,

$\Delta T$ = freezing point depression

i = van 't Hoff factor (number of ions per individual molecule of solute)

m = molality of the solute

$K_{f}$ = molal freezing point

According to question, if concentration (m) and $K_{f}$ is same, then only van 't Hoff factor will change.

For $NH_{4}Cl$ , i = 2

For $Na_{3}PO_{4}$ , i = 4

For $Li_{2}SO_{4}$ , i= 3

Now, the solute with the largest i value results in low freezing point.

The highest value of i is 4 ( $Na_{3}PO_{4}$ ), thus $Na_{3}PO_{4}$ has lowest freezing point.

And, $NH_{4}Cl$ has highest freezing point.

The order of freezing point is : $NH_{4}Cl> Li_{2}SO_{4}> Na_{3}PO_{4}$

3 0

4 years ago

Differentiate between the three types of simple permanent tissues on the basis of their cell walls

True [87]

Answer:

Parenchyma is the most simple and specialized tissue which is concerned mainly with the vegetative activities of the plant. The cells are isodiametric with well-developed intercellular spaces, vacuolated cytoplasm and cellulosic cell wall.

Collenchyma is the tissue of the primary body. The cells of the tissue contain protoplasm and are living without intercellular spaces. The cell wall articulate at the corners and are made up of cellulose, hemicellulose, and pectin.

Sclerenchyma is the thick-walled cell tissue. In the beginning, the cell is living and have protoplasm, but due to deposition of impermeable secondary board lignin, they become dead thick and hard.

5 0

3 years ago

A scientist claimed that he radiocarbon dated a fossilized skull of a dinosaur and found it to be about 63 million years old. Do

Elodia [21]

Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate. After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings. Unwilling to challenge the data openly, they erased the report from public view without a word to the authors. When the authors inquired, they received this letter:

Explanation:

i do not own my copyrights

5 0

3 years ago