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Ipatiy [6.2K]
3 years ago
13

Minerals are very useful to us. Which of the following is a false statement?

Chemistry
2 answers:
mylen [45]3 years ago
7 0

Answer:

A. Pyrite is an ore of gold and is used in jewelry making.

Explanation:

Pyrite is a combination of iron and sulfur, chemically knwon as iron sulfide, it´s called the fool´s gold because it has a golden colour and it´s metallic state often can be preceived as gold, but it is not used in jewelry because could be poisonous to the people wearing it, it´s main use is production of sulfur or sulfiric acid.

Shtirlitz [24]3 years ago
4 0
A. Pyrite is an ore of gold and is used to jewelry making is a false statement
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If an electromagnetic wave has a frequency of 4.5 x 10^18 Hz, what is its wavelength? The speed of light is 3 x 108 m/s.
Mekhanik [1.2K]

Answer:

Wavelength, λ  = 6.7 x 10^-11 m

Explanation:

Frequency and wavelength are inversely proportional to each other.

In this problem;

f =  4.5 x 10^18 Hz

wavelength, λ = ?

Speed of light, c = 3 x 108 m/s.

These variables are related by the following equation;

c = λ * f

Making λ subject of focus, we have;

λ = c / f

λ = 3 x 10^8 / 4.5 x 10^18

λ  = 0.67 x 10^-10

λ  = 6.7 x 10^-11 m

3 0
3 years ago
How many number of oxygen molecules are required to produce 0.22 g of CO2 according to the reaction?
zmey [24]
The number of moles for co2=mass(g)/molar mass
n=.22/44=.005 mole of CO2
from the equation we see the relationship between the moles of co2 and O2 and we find that they have the same number of moles
So we need .005mole of O2
Multiple the number of moles with avogadro’s number to know the number of O2molecules
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3 0
3 years ago
Convert 239 km/hr into m/min
eduard

Answer:

Explanation:

we know that 1 km =1000 m and 1 hour =60 min

therefore

239 km/hr =239*1000m/60 min=3983.3 m/min

6 0
3 years ago
Read 2 more answers
If the gold in the crown was mixed with a less-valuable metal like bronze or copper, how would that affect its density?
Sindrei [870]

Answer: If the gold in the crown was mixed with a less-valuable metal such as bronze of copper then this affects its density by making it to weigh even more and if it weighs more then it has less of chance to float. Observe: Drag each of the crowns into the liquid.

Explanation:

6 0
2 years ago
Volume is the independent or dependent variable
m_a_m_a [10]

Answer:

Independent

Explanation:

Independent Variable is the volume of the object. Dependent Variable is the mass of the object. So it

7 0
2 years ago
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