Answer:
umm.. B. a base that generates a lot of hydroxide ions in water.
H• •Be• •H --> H:Be:H
Since there are 4 valence electrons in total, Beryllium has 2 and Hydrogen has 2. You would put the Be in the middle because there is only 1 of them.
I DO NOT UNDERSTAND THE QUESTION!!!!
Answer:
15.1 g/mL
Explanation:
<em>The density of a substance is defined as the ratio of the mass of the substance and the volume of the substance. Mathematically, it is expressed as:</em>
Density = mass in grams/volume in mL
In this case, the mass of the metal = 30.2 g
Volume of the metal = volume of water displaced by the metal.
<em>The volume of water displaced by the metal can be calculated as the final volume of water after placing the metal - initial volume of water before placing the metal.</em>
Hence, volume of metal = 22.0 - 20.0 mL = 2.0 mL
Density of metal = 30.2/2.0 = 15.1 g/mL
The density of the metal is 15.1 g/mL
<u>The identity of the metal is not in the table.</u>
1) State the equation that represents the chemical reaction
P2O5 + 3H2O → 2H3PO4
2) State the molar ratios: 1 mol P2O5 : 3 mol H2O : 2 mol H3PO4
3) Use the proportions 3molH2O / 2 mol H3PO4
0.729 mol H3PO4 * [ 3 mol H2O / 2 mol H3PO4] = 1.094 mol H2O
Answer: 1.094 mol of water
