An ore is a rock that contains which of the following? A. a mineral or metal with economic usefulness B. a gemstone only C.a mineral or metal with no practical use D. particles of rock that erode into sediment

Answers

Answer 1

Answer: I think the correct answer among the choices presented above is option A. An ore is rock that contains a mineral or metal with economic usefulness. Examples are copper ore, gold ore and iron ore. These ores are being extracted from the Earth by mining.

Answer 2

Answer:

Answer:

The correct answer is option A. "a mineral or metal with economic usefulness".

Explanation:

An ore is defined as a rock or sediment found in nature which contains a mineral or metal with economic usefulness. The minerals or metals in the ore must be extracted before they could be used, and typically, they are refined via smelting. The ore grade is defined according to the concentration of the mineral or metal beneath the rock or sediment.

Related Questions

Group 1A element sodium combines with Group 7A element chlorine to form sodium chloride or table salt. Based on this information, which expression is true about the electronegativity values of these two elements? Na > Cl Na < Cl Na = Cl We cannot make a prediction with the data provided. NextReset
A student records the mass of a piece of iron. The iron is then left outside until it rusts. What type of reaction occurs, and how does the mass of the object after rusting compare with its original mass?
Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?A....Energy is removed from the particles in each change, but more energy is removed in melting than in boiling because the attractions are weaker. B....Energy is removed from the particles in each change, but more energy is removed in boiling than in melting because the attractions are weaker. C....Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome. D....Energy is added to the particles in each change, but melting requires more energy than boiling because the attractions must be completely overcome.
Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant?
The_____is an organelle that can give instructions for acell to reproduce and send directions to organelles to make neededmaterials.

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical equation? Al2O3 + 3C → 2Al + 3CO

Answers

Answer:

Theoretical yield = 31.8 g

Explanation:

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

For $Al_2O_3$

Mass of $Al_2O_3$ = 60.0 g

Molar mass of $Al_2O_3$ = 101.96128 g/mol

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

Thus,

$Moles= (60.0\ g)/(101.96128\ g/mol)$

$Moles_(Al_2O_3)= 0.5885\ mol$

Given: For $C$

Given mass = 30.0 g

Molar mass of $C$ = 12.0107 g/mol

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

Thus,

$Moles= (30.0\ g)/(12.0107\ g/mol)$

$Moles_(C)= 2.4978\ mol$

According to the given reaction:

$Al_2O_3+3C\rightarrow 2Al+3CO$

1 mole of aluminium oxide react with 3 moles of carbon

0.5885 mole of aluminium oxide react with $3* 0.5885$ moles of carbon

Moles of carbon = 1.7655 moles

Available moles of carbon = 2.4978 moles

Limiting reagent is the one which is present in small amount. Thus, aluminium oxide is limiting reagent.

The formation of the product is governed by the limiting reagent. So,

1 mole of aluminium oxide on reaction forms 2 moles of aluminium.

0.5885 mole of aluminium oxide on reaction forms $2* 0.5885$ moles of aluminium.

Moles of aluminium = 1.177 moles

Molar mass of aluminium = 26.981539 g/mol

Mass of sodium sulfate = Moles × Molar mass = 1.177 × 26.981539 g = 31.8 g

Theoretical yield = 31.8 g

HELP......Percussion instruments are musical instruments that make noise when they are hit with an object. Which of these are percussion instruments? Check all that apply.a clarinet, which makes sound when air is blown into a woodwind mouthpiece

a drum, which makes sound when a mallet hits its surface

a cymbal, which makes sound when it is crashed against another cymbal

a trumpet, which makes sound when air is blown into a brass mouthpiece

a violin, which makes sound when a bow slides across strings

Answers

The percussion instruments are a drum, which makes sound when a mallet hits its surface and a cymbal, which makes sound when it is crashed against another cymbal.

What are percussion instruments?

Percussion instruments generate sound when struck by an object. Among the options provided, the drum and the cymbal are indeed percussion instruments. A drum produces sound when a mallet or stick hits its surface, causing vibrations that create the characteristic drumming sound. Similarly, a cymbal produces sound when it is crashed against another cymbal or struck with a mallet.

So, the percussion instruments that fit the description of making sound when struck are the drum and the cymbal. These instruments belong to the percussion family, which is characterized by its reliance on impact to produce musical tones.

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Answer:

I believe that the percussion instruments are the drum and cymbal.

Which substance cannot be broken down by a chemical change?(1) ammonia (2) mercury (3) propane (4) water

Answers

The substance that cannot be broken down by chemical change is $\boxed{\left( 2 \right){\text{ mercury}}}$ .

Further Explanation:

Substance is the pure form of matter while a combination of atoms or molecules is termed as mixture.

Types of substances:

1. Element

The simplest form of substance that cannot be further decomposed by any chemical means is called an element. Carbon, sulfur, and cobalt are some of the examples of elements.

2. Compound

When two or more different elements are held together by chemical methods, compounds are formed. These can further be decomposed into their corresponding constituents. The properties of compounds are very different from those of their constituent elements. NaCl, ${\text{C}}{{\text{H}}_{\text{4}}}$ and ${{\text{H}}_{\text{2}}}{\text{O}}$ are examples of compounds.

(1) Ammonia is composed of one nitrogen and three hydrogen atoms so it is a compound. Therefore it can be broken down by chemical change.

(2) Mercury is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down by chemical change.

(3) Propane is composed of three carbon and eight hydrogen atoms so it a compound. Therefore it can be broken down by chemical change.

(4) Water is composed of one oxygen and two hydrogen atoms so it is a compound. Therefore it can be broken down by chemical change.

Learn more:

Which sample is a pure substance? brainly.com/question/2227438
Which must be a mixture of substances? brainly.com/question/637791

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Elements, compounds, and mixtures

Keywords: substance, mercury, propane, water, ammonia, element, compound, chemical change, decomposed, simplest form, NaCl, CH4, carbon, sulfur, cobalt.

The substance which cannot be broken down by a chemical change is mercury as it is an element, hence option 2 is correct.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

Thus, option 2 which is mercury is correct as it is an element.

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Fossil fuels are made by the decay of living things. Because living things are always dying and decaying, why are fossil fuels not a renewable source of energy?A.They can only be formed by decay of reptiles.

B.They can only be formed by decay of swamp plants.

C.They take millions of years to form.

D.They can only be formed deep under the sea.

Answers

The answer is: C. They take millions of years to form.

Fossil fuel is a fuel formed by anaerobic decomposition of buried dead organisms.

If there was oxygen the organic matter would not decomposed and formed oil and gas, because there would be reaction of oxidation.

The age of the organisms and their resulting fossil fuels is typically millions of years

Fossil fuel is mixture (solution) consist of several different hydrocarbons (alkanes, alkenes...), aromatic compounds.

c. they take millions of years to form

Which radioisotope is used for diagnosing thyroid disorders?(1) U-238 (3) I-131
(2) Pb-206 (4) Co-60

Answers

The correct answer is option 3. The radioisotope used for diagnosing thyroid disorders is I-131. This isotope is used due to its low expense compared to other radioisotopes. I- 31 is a beta and gamma emitter used for the ablations of thyroid tumors.

Final answer:

I-131 (Iodine-131) is the radioisotope used for diagnosing thyroid disorders. It is selectively taken up by the thyroid gland and its emissions allow for imaging of the gland.

Explanation:

The radioisotope used for diagnosing thyroid disorders is I-131 (Iodine-131). This radioisotope is used in medical procedures due to its unique characteristics. When consumed, it is selectively taken up by the thyroid gland. I-131 emits beta particles and gamma radiation which allows for imaging of the thyroid gland. This in turn helps health professionals diagnose if the thyroid is functioning normally or if disorders such as hyperthyroidism or tumors are present.

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Give the chemical name and formula for limestone.

Answers

CaCO3, it's called calcium carbonate :D

limestone calcium carbonate CaCO3
common chemical name formula

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