Answer:
Imagine that you are a farmer in ancient Egypt. You must carefully plan around the flooding of the Nile in order to raise your crops.
Starting with planting (number 1), use the numbers 1 - 5 to place the following events in the correct order.
1 The floodwater recedes and you plant your crops.
The Nile begins to rise.
The Nile Valley is flooded again.
The hot season begins, and the Nile begins to dry up.
You harvest your crops
Explanation:
Oxygen<span> is a </span>chemical element<span> having a symbol </span>O<span> and having an </span>atomic number<span> 8.
Oxygen is a pure substance , and it is not a mixture or solution, Niether it is a compound ... Instead , it forms chemical compounds by reacting with other elements.
So , according to above explanation ,
A. A pure substance , is the correct answer.</span>
Answer:
Explanation:
Equation of the reaction:
NaOH + HCl --> NaCl + H2O
Volume of HCl = 5 ml
Molar concentration = 1 M
Number of moles = molar concentration * volume
= 1 * 0.005
= 0.005 mol of HCl
By stoichiometry, 1 mole of HCl completely neutralizes 1 mole of NaOH
Therefore, number of moles of NaOH = 0.005 mol
Molar mass of NaOH = 23 + 16 + 1
= 40 g/mol
NaOH --> Na+ + OH-
Mass = molar mass * number of moles
= 40 * 0.005
= 0.2 g of Na+
Answer:
Boil it.
Explanation:
If you mean how to clean water to sanitize it you have to boil it.
