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frosja888 [35]
2 years ago
11

Which one of the following are pure substances : water,salt water,copper,brass,air,oxygen​

Chemistry
2 answers:
ANEK [815]2 years ago
5 0

Answer:

Copper, Water, and Oxygen

Explanation:

Because they are compounds and compounds are pure substances <3

ASHA 777 [7]2 years ago
5 0

Answer: copper

Explanation: because all of the atoms that make up copper are copper i.e its not a compound or mixture. not made od molecules

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write chemical equation for the following decomposition reactions. Aluminum oxide(s) decomposes when electricity is passed throu
belka [17]

Answer:

2Al2O3 (l) ---> 4Al (l) + 3O2 (g)

Explanation:

The reaction is the electrolysis of aluminium oxide. It decomposes aluminium oxide (Al2O3) into aluminium metal (Al) and Oxygen (O2). In this process, aluminium oxide is molten (liquid state) so that ions can move to complete the electricity circuit.

Al2O3 (l) ---> Al (l) + O2 (g)

Balance the equation:

2Al2O3 (l) ---> 4Al (l) + 3O2 (g)

4 0
3 years ago
How many grams of water are theoretically produced in the reaction between 5 moles of sulfuric acid and 5 moles of potassium hyd
GaryK [48]
25.0  g.....................................................
3 0
2 years ago
Matter is everywhere around us. Make a list by nameof fifteen different kinds of matter that you encounter every day. Your list
Dmitry [639]
Solids: wood, plastic, metals

Liquids: water (H2O), soap, juice, milk

Gases: Air, water vapour (H2O), carbon dioxide (CO2)

An element: gold, silver, aluminum, copper, nickel, iron, nitrogen in the air

A compound: salt (NaCl), carbon dioxide (CO2)

A homogenous mixture: air, water with sugar or salt dissolved in it

A heterogeneous mixture: orange juice with pulp, cereal in milk

Pure substances: diamond, water, salt, baking soda, sugar
6 0
2 years ago
4. An element is a substance made up of two kinds of matter. True or false?
mestny [16]

Answer:

false

Explanation:

Elements are pure substance. A ball of sodium will only have sodium atoms.

8 0
2 years ago
Find the number of moles in 3.10 x 10^-1g of boron
Sever21 [200]

Answer:

0.0286 moles

Explanation:

Given mass, m=3.1\times 10^{-1}g=0.31\ g

Molar mass of boron, M = 10.811 g/mol

\text{No of moles}=\dfrac{\text{given mass}}{\text{molar mass}}\\\\n=\dfrac{0.31}{10.811 }\\\\n=0.0286

Hence, there are 0.0286 moles in given mass of boron.

6 0
3 years ago
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