CHEMISTRY MIDDLE SCHOOL

Your answer should have the same number of significant figures as the starting measurement. 400.08 mL

Answers

Answer 1
Answer: That starting measurment has 5 sig figs

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Balance the chemical equation. ___Mg + ___Fe2O^3 -> ___MgO + ___Fe

Answers

Answer:

3Mg + Fe₂O₃ → 3MgO + 2Fe.

Explanation:

  • To balance the equation, you should apply the law of conservation of mass for the equations.
  • The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).
  • The balanced equation is:

3Mg + Fe₂O₃ → 3MgO + 2Fe.

That 3.0 mole of Mg react with 1.0 mole of Fe₂O₃ to produce 3.0 moles of MgO and 2.0 moles of Fe.

  • The no. of all atoms is the same in both of reactants and products side.

Mg (3), Fe (2), and O (3).

A natural sample of neon has a relative atomic mass of 20.2.What is the mass number of the most common type of atom in the sample of neon?

Answers

Neon-20.

If the mass number = 20.2, the most common type of atom is probably neon-20.

How many moles are in 213 grams of NaCl?

Answers

Answer:

There are 3, 64 moles of NaCl.

Explanation:

First we calculate the mass of 1 mol of NaCl, starting from the atomic weights of Na and Cl obtained from the periodic table. Then we calculate themoles in 213 grams of NaCl, making a simple rule of three:

Weight NaCl= Weight Na + Weight Cl = 23 g + 35, 5 g= 58, 5 g/ mol

58,5 g ------1 mol NaCl

213 g---------x= (213 g x 1 mol NaCl)/ 58, 5 g= 3, 64 mol NaCl

What is the definiten for chemiacal weathering

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the breakdown of rocks by chemical mechanisms 
Chemiacal weathering is the process which breaks down rocks. 

_____ Na3PO4 + _____ KOH   arrow  _____ NaOH + ___________K3PO4

How do I balance this equation?

Answers

The answer is na3po4+3koh=3naoh+k3po4

Which Gender Has Better Reflexs

Answers

As many studies have shown that men have faster reflexes then woman, many woman can have better reflexes then men. It just depends on your genes and dna and all the things that make you be good at things. 
men do because what research says is that men have more muscles then women
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