CHEMISTRY HIGH SCHOOL

How much CaCl2, in grams, is needed to make 2.0 L of a 3.5M solution?

Answers

Answer 1
Answer: find the number of moles: 2•3.5=7 moles

and do dimensional analysis. to convert moles of solution to moles of cacl2 and moles of cacl2 to grams of cacl2 (molar mass)

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Consider the following unbalanced redox reaction:MnO4- (aq) + SbH3 (aq) ---> MnO2 (s) + Sb (s)

What is the oxidizing agent in the reaction?

A.) MnO4-

B.) SbH3

C.) MnO2

D.) Sb

Help please?

Answers

You're oxidising agent will be reduced. In the molecule MnO4-, Mn has and oxidation number of +9 and in MnO2 it is +4, therefore its oxidation number has reduced, therefore Mn is reduced, therefore it is the oxidant/oxidising agent.

A pure substance that can't be broken down into simpler substances by chemical or physical means.A. chemical
B. atom
C. element
D. mineral

Answers

an element cannot be broken dwn

Which of the following products is petroleum based? A) steel B) maglev C) plastic D) iron E) Internet

Answers

The product that is petroleum based is the plastic. The answer is letter B. Steel, iron and maglev are metals derived from coals. Internet is also not a petroleum based product

petroleum based is materiel's that contains different kinds of oil and fuel. "which are used in chemical processes to produce plastics".

Why is gold less reactive than iron?

Answers

The metals copper, silver gold and platinum are less reactive than hydrogen and they do not replace hydrogen from water or acid. Examples for metal-displacement reactions: Zinc can displace copper from copper sulphate solution and iron from ferrous sulphate solution. So zinc is more reactive than iron and copper. 

Answer:

Iron has a standard electrode potential which is less than gold, which therefore means the gold is less reactive,  

Why does an ion have an electrical charge?

Answers

An ion has an electrical charge because it either has more electrons than protons or it has more protons than electrons. Electrons, which are found in the shells of an atom, have a negative charge, while protons, found in the atom's nucleus, have a positive charge.

1) Write the word and symbol equation to show what happens when water is added to Calcium Oxide.2) Write word and symbol equations for the thermal decomposition of limestone.

Answers

2. caco3 -> cao + co2
    limestone -> calcium oxide + carbon dioxide
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