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Daniel [21]
3 years ago
11

13. Which statement best describes an element? *

Chemistry
1 answer:
Natasha2012 [34]3 years ago
4 0

Explanation:

Distinguish chemical substances from mixtures

Key Points

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.

A chemical substance is composed of one type of atom or molecule.

A mixture is composed of different types of atoms or molecules that are not chemically bonded.

A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.

A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.

Various separation techniques exist in order to separate matter, including include distillation, filtration, evaporation and chromatography. Matter can be in the same phase or in two different phases for this separation to take place.

Terms

substanceA form of matter that has constant chemical composition and characteristic properties. It is composed of one type of atom or molecule.

elementA chemical substance that is made up of a particular kind of atom and cannot be broken down or transformed by a chemical reaction.

mixtureSomething that consists of diverse, non-bonded elements or molecules.

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Volgvan

Answer:

The substances to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The presence of the arrow also indicates that the reaction goes in one direction under the conditions indicated.

Explanation:

3 0
2 years ago
What is the osmotic pressure of a solution made by dissolving 55.0 g of glucose, C6H12O6, in enough water to form 800.0 mL of so
Stels [109]

Answer:

The osmotic pressure is 8.85 atm

Explanation:

Step : Data given

Mass of glucose = 55.0 grams

Volume of water =800.0 mL

Temperature = 10.0 °C

Step 2: Calculate moles glucose

Moles glucose = mass glucose / molar mass glucose

Moles glucose = 55.0 grams / 180.156 g/mol

Moles glucose = 0.305 moles

Step 3: Calculate osmotic pressure

π = iMRT  

⇒ with π = the osmotic pressure = TO BE DETERMINED

⇒ with i = the van't Hoff factor for glucose = 1

⇒ with M = the concentration = moles / volume = 0.305 moles / 0.800 L =0.381 M

⇒ with R = the gas constant = 0.08206 L*atm*mol¨K

⇒ with T = the temperature = 10.0 °C = 283 K

   

 π = 1* 0.381 *0.08206 * 283

 π = 8.85 atm

 

The osmotic pressure is 8.85 atm

   

   

 

   

   

3 0
3 years ago
Which of the following systems has the highest entropy?. . . A cup of ice at 0 degrees C. . A cup of water at 50 degrees C. . A
Sholpan [36]
Entropy is a measure of chaos or disorder in a system. For the first one, the system with the highest entropy is a cup of water at 0 degress centigrade.  For the second question, the system with the lowest entropy is  sugar crystals in 95 degrees centigrade cup of coffee. 
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3 years ago
Read 2 more answers
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A and C I hope I helped :))
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3 years ago
Aluminium sulphate is organic or inorganic compound​
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Answer:

Inorganic compound the vast majority of compounds, including all aluminum-containing minerals and all commercially significant aluminum compounds, feature aluminum is in oxidation state 3+. the coordination number of such compounds varies, but generally Al3+ is either six or four coordinate.

<h3><em>hope</em><em> it</em><em> helps</em></h3>

8 0
2 years ago
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