Answer:
13 minutes
Explanation:
For the endothermic reaction to reach 0°C, it will take 13 minutes.
Let us follow the process step by step;
Rate of decrease is 2°C per minute.
Start is 26°C
Time temperature
0 min 26°C
1 min 24°C
2 min 22°C
3 min 20°C
4 min 18°C
5 min 16°C
6 min 14°C
7 min 12°C
8 min 10°C
9 min 8°C
10 min 6°C
11 min 4°C
12 min 2°C
13 min 0°C
Answer:
A
Explanation:
B - Can't be - Ionic bonds are formed by oppositely charged ions
C - Can't be - This is a covalent bond
D - Can't be - This is an induced dipole or a van Der waals attraction
E - This is a permanent dipole dipole attraction
When a substance goes from being a liquid to a gas it evaporates, or boils away. Think of boiled eggs.
Answer:
164.3g of NaCl
Explanation:
Based on the chemical equation:
CaCl2 + 2NaOH → 2NaCl + Ca(OH)2
<em>where 1 mole of CaCl2 reacts with 2 moles of NaOH</em>
To solve this question we must convert the mass of CaCl2 to moles. Using the chemical equation we can find the moles of NaCl and its mass:
<em>Moles CaCl2 -Molar mass: 110.98g/mol-</em>
156.0g CaCl₂ * (1mol / 110.98g) = 1.4057 moles CaCl2
<em>Moles NaCl:</em>
1.4057 moles CaCl2 * (2mol NaCl / 1mol CaCl2) = 2.811 moles NaCl
<em>Mass NaCl -Molar mass: 58.44g/mol-</em>
2.811 moles NaCl * (58.44g / mol) = 164.3g of NaCl
