1s2 2s2 2p6 3s2 3p6 4s2 3d7
<u>Answer:</u>
<em>B. A and B</em>
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<u>Explanation:</u>
1. Solids have a definite volume, definite size and definite shape
2. The particles present in a solid are very closely packed since the intermolecular forces between them are very strong. The molecules do not move apart.
3. Melting point is the temperature at which solid changes into a liquid.
4. When a solid is heated to the melting point the intermolecular forces are overcome by the energy and the molecules present in it moves from its fixed position to take its liquid state which is called as melting.
Answer:
Exothermic
Explanation:
Since heat is released the reaction is exothermic.
Answer: D=8900g/L
Explanation:
Density is mass/volume. Mass in in grams and volume is in liters.
1 cm³=1 mL
With this conversion, we can convert cm³ to L.
When we convert, we cancel out cm³ and mL to get L alone. The density is 8900 g/L.
There is a 2:1 ratio between H2 and O2. so for every mol of O2 used there would be 2 mol needed, so if we use 4 mol of O2 we multiply 4 by 2 to get 8 mol of H2 used in this reaction