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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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Find the density of a cube on Earth that weighs 1.5 kg and has a side-length of 10 cm.
Inga [223]

Answer:

1.5g/cm³

Explanation:

density=mass÷volume

mass= 1.5kg (<em>c</em><em>h</em><em>a</em><em>n</em><em>g</em><em>e</em><em> </em><em>i</em><em>n</em><em>t</em><em>o</em><em> </em><em>g</em>) = 1500g

volume of the cube = 10×10×10 = 1000cm³

density= divide 1500g÷1000cm = 1.5g/cm³

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4 0
3 years ago
Which balanced equation represents an oxidation-reduction reaction?
Bingel [31]

Answer:

Oxidation states are used in chemistry solutions. It is a bond in which electron transfers easily from one nucleus to another nucleus.

Explanation:

  • Oxidation-reduction reactions have some rules.
  • The oxidation state is 0 at an uncombined bond.
  • The bond of oxidation reduction is +1 in alkeli metal.
  • The bond in two metal is +2
  • The oxidation reduction state at helogens is -1. It does not happened always.
  • The oxygen bond in oxidation and reduction is -2.
  • The sum of the oxidation state is equal to the compound charges.
  • In this process the changes occur for any elements. Redox could be occur. Its oxidized and reduction reaction can be seen in this process.
7 0
3 years ago
If a boron atom has 5 protons and 6 neutrons then how many electrons does it have?
3241004551 [841]

Answer:

5 elections

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8 0
3 years ago
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For each of the following acid-base reactions, calculate how many grams of each acid are necessary to completely react with and
Anika [276]

Answer:

m_{HCl}=2.19gHCl

Explanation:

Hello,

In this case, for the reaction between hydrochloric acid and sodium hydroxide, for 2.4 g of base, we can compute the neutralized grams of acid by applying the 1:1 molar ratio between them and their molar masses, 36.45 g/mol and 40 g/mol respectively as shown below by stoichiometry:

m_{HCl}=2.4gNaOH*\frac{1molNaOH}{40gNaOH}*\frac{1molHCl}{1molNaOH}*\frac{36.45gHCl}{1molHCl}\\   \\m_{HCl}=2.19gHCl

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3 years ago
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