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cluponka [151]
3 years ago
9

Explain how you can use an atoms mass number and atoic number to determine the number of protrons electrons and neutrons in the

atom
Chemistry
1 answer:
VMariaS [17]3 years ago
7 0
Simple!

Atomic number= number of protons AND number of electrons (in an atom)

Mass number= number of neutrons


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In the lab you react 2.0 g of Na2CO3 with enough CaCl2. According to the reaction Na2CO3 + CaCl2 -> CaCO3 + 2NaCl How much Ca
vlada-n [284]

Answer:

1.89 g CaCO₃

Explanation:

You will have to use stoichiometry for this question.  First, look at the chemical equation.

Na₂CO₃  +  CaCl₂  ==>  2 NaCl  +  CaCO₃

From the above equation, you can see that for one mole of Na₂CO₃, you will produce one mole of CaCO₃.  This means that however many moles of Na₂CO₃ you have in the beginning, you will have the same amount of moles  of CaCO₃, theoretically speaking.

So, convert grams to moles.  You should get 0.0189 mol Na₂CO₃.  This means that you will get 0.0189 mol CaCO₃.  I'm not sure what units you want the answer in, but I'm going to give it in grams.  Convert moles to grams.  Your answer should be 1.89 g.

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3 years ago
Objects take on______ when they are lifted against the force of gravity to a position where they have the potential to fall.
Papessa [141]

A. because you haven't released the object so therefor the potential gravity force applied becomes actual when released.

8 0
3 years ago
What are the electrons capable of Sharing accepting or donating called?
Oliga [24]
Substances have different tendencies to donate or accept electrons. When a really good donor meets a great acceptor, the chemical reaction releases a lot of energy. Oxygen (O2) is the best electron acceptor and is used in many aerobic reactions (reactions with oxygen). Hydrogen gas (H2) is a good electron donor.

When O2 and H2 are combined, along with a catalyst, water (H2O) is formed. This example of a redox reaction can be written like this:




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Bingel [31]

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180º

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During which change of state would the volume of a substance increase the most?
Mademuasel [1]

Answer:

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Explanation:

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