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IRINA_888 [86]
3 years ago
15

Minerals are very useful to us. Which of the following is a false statement? Question options: Pyrite is an ore of gold and is u

sed in jewelry making. Talc is used in paper making, plastics, and paint. Quartz is used to make glass. Cobalt is not used in medicine.
Chemistry
1 answer:
Andrew [12]3 years ago
8 0

Answer:

Option C= Cobalt is not used in medicine

This statement is incorrect.

Explanation:

Pyrite is an ore of gold and is used in jewelry making (correct statement)

Pyrite:

1. pyrite is yellow brass mineral.

2. its chemical composition is  FeS2.

3. it is also called ore of gold

4. it is used in jewelry.

Talc:

Talc is used in paper making, plastics, and paint (correct statement)

1. it is phyllosilicate mineral in the form of sheets.

2. its chemical formula is Mg3Si4O10 (OH)2.

3. it is very important constituent of roofing material.

4. it is used in many industries like paper making, paints, electrical cables, food etc.

Quartz:

Quartz is used to make glass (correct statement)

1. its chemical formula is SiO2.

2. its large amount is used in manufacturing of ceramic and glass.

3. The second most abundant mineral found in the earth crust is also quartz.

Cobalt:

Cobalt is not used in medicine (incorrect statement)

1. Cobalt is widely used in medical field.

2. it is used in the detection of metastasis and tumor.

3. it is used in the replacement of knee and hip as a prosthetic alloys.

Minerals are very important in our daily life. They are widely used in construction material for example in the construction of buildings and roads and also in medical field.

Examples:

1. Copper is used in the electronic and electrical field.

2. Zinc is used in rust resistant metals, skin care creams. rubber paints etc.

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A student reports the following measurements for a set of pennies: 102.0mL, 91.0 g. What is the density of the pennies.
zysi [14]

Answer:

V = 102.0 ml

m = 91.0 ml

density = ...?

density = m / V

= 91.0 / 102.0

= 0.89215 g/ml

7 0
2 years ago
What kind of intermolecular force is between hydrogen sulfide and hydrogen iodide?
RUDIKE [14]
I will have to go with carbon monoxide
8 0
3 years ago
If sodium is burned in chlorine gas, a compound is formed that dissolves in water. What colour will the solution be?
Alchen [17]

If sodium is burned in chlorine fuel, a compound is formed that dissolves in water. the solution be: Bright yellow mild

Chlorine is a yellow-green gas at room temperature. Chlorine has a smelly, annoying scent similar to bleach that is detectable at low concentrations. The density of chlorine gasoline is about 2.5 times extra than air, so one can reason it to initially stay near the floor in regions with little air movement.

Chlorine gasoline can be recognized by using its smelly, anxious smell, which is like the scent of bleach. The sturdy scent may additionally provide a good enough caution to human beings that they have been uncovered. Chlorine fuel appears to be yellow-green in color. Concentrations of approximately 400 ppm and past are commonly fatal over a half-hour, and at 1,000 ppm and above, fatality ensues within only some mins. A spectrum of scientific findings can be present in those uncovered to excessive tiers of chlorine.

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6 0
10 months ago
Suppose a gas mixture used for anesthesia contains 4.60 mol oxygen (O₂) and 6.00 mol nitrous oxide (N₂O). The total pressure of
julia-pushkina [17]

Considering the definition of mole fraction, the mole fraction of O₂ in the mixture is 0.434.

<h3>Definition of mole fraction</h3>

The molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.

In other words, the mole fraction expresses the concentration of solute in a solution as the ratio of moles of substance to total moles of solution:

mole fraction=\frac{moles of substance}{moles of solution}

<h3>Mole fraction of O₂ in this mixture</h3>

In this case, you know a gas mixture used for anesthesia contains 4.60 mol oxygen (O₂) and 6.00 mol nitrous oxide (N₂O).

So, the total moles of the solution can be calculated as:

Total moles = moles of oxygen (O₂) + moles of nitrous oxide (N₂O)

Then:

Total moles= 4.60 moles + 6 moles

Total moles= 10.60 moles

Finally, the more fraction of O₂ can be calculated as follow:

Mole fraction of O_{2} =\frac{moles of O_{2}}{total moles}

Mole fraction of O_{2} =\frac{4.60 moles}{10.6o moles}

Solving:

<u><em>Mole fraction O₂ = 0.434</em></u>

Finally, the mole fraction of O₂ in the mixture is 0.434.

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3 0
2 years ago
202H8(9) + 7 O2(g) &gt; 4CO2(g) + 6 H2O(9).
lilavasa [31]

since the concentration of Carbon Dioxide will increase, it would make Q > K, cause equilibrium to shift in the direction with less moles of gas to alleviate the extra pressure. In this case, the reaction will shift left because there are fewer moles of gas present.

4 0
2 years ago
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