1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Debora [2.8K]
3 years ago
12

Your friend is having a hard time with the terminology in this unit. He is confused between the terms pure substances, mixtures,

elements, compounds, homogeneous, and heterogeneous, as well as the difference between physical and chemical changes. Without just reciting the definitions, explain each term to your friend and provide at least two examples of each that will help him understand the concepts better.
Social Studies
1 answer:
Keith_Richards [23]3 years ago
8 0

Answer and Explanation:

  • Pure substances are basically chemical substances with distinct composition and properties that are constant. They may consist of one atom, molecule or compound that cannot be easily separated by physical separation technique. <em>Examples of pure substances are iron, water, gold etc. </em>
  • Mixtures are made up of two or more substances that are not chemically combined together, in which each substance that make up the mixture still retains their chemical identity, and can separated by physical method. <em>Examples of mixtures are brass made up of different metals, salt water, milk etc. </em>
  • Elements are pure chemical substances that are made up of a single type of atom which cannot be easily broken down. <em>For example, hydrogen, oxygen, iron. </em>
  • Compounds are made up of two more different elements that are chemically bonded together by chemical bonds. <em>Examples include NaCl or salt, which is made up of Na and Cl; Water which is made up of Hydrogen and Oxygen </em>
  • Homogenous mixture contains substances of uniform composition, <em>e.g, air which consists of mixture of gases; a mixture of salt and water; milk etc. </em> Heterogenous mixture, on the other hand contains substances whose distribution are not uniform, i.e. non-uniform. <em>Examples are a mixture of sand and water; water and oil etc. </em>
  • Physical change is a type of change that involves the change of form of a matter without the chemical properties being altered. This is a reversible change. On the other hand, a chemical change is an irreversible change in which the chemical properties of a matter are changed.
  • <em>Examples of physical change are freezing of water, melting an ice cube, melting of wax etc.  </em>
  • <em>Examples of chemical change are burning of wood, rusting of iron etc</em>.
You might be interested in
Why did the mongols have difficulty conquering southeast Asia
Katyanochek1 [597]
The Great Wall of China........................
7 0
3 years ago
Read 2 more answers
This letter from the poet Petrarch to his brother, reflects all of the attitudes of society during the Black Death except:
vlada-n [284]

Answer:

d

Explanation:

7 0
2 years ago
Read 2 more answers
I need this before 3;30
olganol [36]
Did you get it or no??
3 0
3 years ago
During Pedro II’s rule, Brazil grew and made great economic<br> progress. true or false
Andru [333]

Answer:

True is the correct answer.

Explanation:

7 0
3 years ago
Nina is president of her class, and she has to give her principal a speech on what her class plans to do with their budget. She
chubhunter [2.5K]

Answer:

Memorized speech is the correct answer.

Explanation:

8 0
3 years ago
Other questions:
  • A savings bond functions most like which of the following?
    14·2 answers
  • Many Americans pay for haircuts, trips to the dentist, or transportation on the metro and bus systems. These actions support the
    12·1 answer
  • Political parties have been a part of America government since?
    14·1 answer
  • Stepfamilies reach the last stage of development: A. after about 7 years. B. just prior to redivorce. C. after the first year. D
    12·1 answer
  • In the case of Plessy v. Ferguson, a the principle of "separate but equal" was used to justify segregation. b school busing was
    9·1 answer
  • Suppose your measure of interpersonal aggressiveness involves having trained observers watch the person being assessed in a vari
    15·1 answer
  • Look at the map of the Mongol Empire there are 4 seas on all sides and what are they
    12·1 answer
  • How do you help your mom at home? wrote in 2 sentences.<br>grade 3 ​
    14·2 answers
  • According to globalization supporters, what is an advantage of globalization?.
    13·1 answer
  • Many anthropologists observe that cultural borrowing is often a double-edged process because?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!