CHEMISTRY MIDDLE SCHOOL

What are five main characteristics of a mineral

Answers

Answer 1
Answer:
  • Minerals are natural
  • Minerals are inorganic
  • Minerals are solids
  • Menirals have definite chemical composition
  • Minerals have  crystalline structure

Explanation:

  • Minerals are natural

Minerals should be found in nature. Elements made laboratories are not actual minerals like masquerading as rubies or sapphires. All naturally available crystals are not minerals like opal and amber.

  • Minerals are inorganic

Minerals are not under any class of organic compounds. Almost all known minerals come from inorganic processes. Some minerals originate from organic processes like pearls.

  • Minerals are solids

Minerals exist only as solids. Solids have a defined volume and shape, and they cannot be compressed any further. Minerals are rigid.

  • Definite chemical composition

Each mineral has a unique combination of atoms that cannot be found in other minerals. The strength of mineral can be defined by the type of bond a mineral has. Some minerals, like gold and diamond, have only one element in it.

  • Crystalline structure

Minerals form crystals that have repeated arrangements of ions. Minerals have different shapes depending on the size of the ion. Crystals usually take six types of shapes.

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A lab technician needs to create 570.0 milliliters of a 2.00 M solution of magnesium chloride (MgCl2). To make this solution, how many grams of magnesium chloride does the technician need?Refer to the periodic table for help. Express your answer to three significant figures.

The required mass is grams.

Answers

This question needs to use the molarity equation, M=(n)/(V), where M is molarity, n is number of moles and V is the volume. With this equation we can find the number of moles. The volume of 570ml should be converted to L for correct units.

n=MV= (2mol)/(L)* 570ml * (L)/(1000ml)= 1.14mol

Multiply the number of moles by the molecular mass of MgCl_2 which is 95.21 g/mol to get the mass.

1.14 mol Mg(Cl_2) *(95.21 g)/(mol) = 108 g.

109 for brainly just did it 5/5 correct (Three significant figures)

Which best describes the difference between a physical change and a chemical change? A. A chemical change does not result in a new substance being formed, whereas a physical change does.

   B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

   C. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.

   D. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.

Answers

Answer:

  •   The correct answer is B.

A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

Physical properties:

Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.

Example.

Water when freezes into ice, it is physical change, just state is change.

Chemical properties:

The chemical properties depend upon composition.

Example:

Formation of precipitates is an example of chemical change.

A 4 kg rock is rolling 10 m/s find its kinetic energy

Answers

The answer is 200 J

The kinetic energy (KE) is:
KE = 1/2 m * v²
m - mass of the object
v - velocity of the object

We have:
m = 4 kg
v = 10 m/s

KE = 1/2 * 4 kg * 10² m/s
KE = 200 J

What is a tough, rigid, outer covering that protects some cells and gives them shape?

Answers

it iscalled the "cell wall"

Given that equation Na+(s)O2–> Na2O. Find the mass of sodium needed to produce 12.5 grams of sodium oxide.

Answers

Answer: 9.27 g of Na

Explanation:Please see attachment for explanation

How is the telegraph you made like the one morse made?

Answers

it developed in the 1830s and 1840s by samual morse and other inventors, the telegraph revolutionized long-distance communication. 

Answer:

it developed in the 1830s and 1840s by Samual Morse and other inventors, the telegraph changed long distance communication.

Explanation:

Using the time period, the ability to use telegraphs on moving trains came to be shortly after.
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