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romanna [79]
3 years ago
7

Which of the following statements about boiling points is true?

Chemistry
1 answer:
lutik1710 [3]3 years ago
5 0
<span>The boiling point of a substance is higher than its freezing point</span>
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Which element has chemical properties that are most similar to potassium?
Leni [432]

Answer:

nitrogen is the answer because of the same position of group in periodic table

4 0
3 years ago
How many moles of dinitrogen tetroxide (N2O4) are in 6.49 x 109 particles?
yan [13]

Answer: There are 1.08 \times 10^{-14} moles N_{2}O_{4} present in 6.49 \times 10^9 particles.

Explanation:

According to the mole concept, 1 mole of a substance contains 6.022 \times 10^{23} particles.

Hence, number of moles present in 6.49 \times 10^9 particles are calculated as follows.

No. of moles = \frac{6.49 \times 10^9}{6.022 \times 10^{23}} mol

                      = 1.08 \times 10^{-14} mol

Thus, there are 1.08 \times 10^{-14} moles N_{2}O_{4} present in 6.49 \times 10^9 particles.

6 0
3 years ago
Read 2 more answers
Chemical reaction occurs when the chemical identity of the reactants is different from that of the products. A new substance for
nikdorinn [45]

Answer:

Explanation:

Exothermic: the surrounds feel warmer. A wood fire stove is a good example of an exothermic reaction. You can feel the heat on your hands. It's exothermic.

Endothermic is exactly the opposite. The reaction takes place, but the heat comes from the surroundings. When you touch something that goes through an endothermic reaction, it feels much cooler.

This reaction, just by definition is endothermic.

5 0
3 years ago
A few Sources of error in saponification experiment ?
garri49 [273]

Answer:

Saponification is a process of mixing triglycerides with potassium hydroxide (lye) in order to produce fatty acid and glycerol also known as soap.

During this experiment, many errors can occurs which are following;

  • Incorrect measurement of both the salts that combine to form soap.
  • The beaker and the stirrer has residue of some other chemical that gets mixed with two components and reacts.
  • The two products are not mixed well or not long enough to reach the end product.
  • The temperature is not favorable.
  • The resting period is not calculated properly

I hope the answer is helpful.

5 0
4 years ago
Morphine has the formula c17h19no3. it is a base and accepts one proton per molecule. it is isolated from opium. a 0.685 −g samp
kotykmax [81]
2 C₁₇H₁₉NO₃ + H₂SO₄ → Product
Moles of H₂SO₄ = M x V(liters) = 0.0116 x 8.91/1000 = 1.033 x 10⁻⁴ mole 
moles of morphine = 2 x moles of H₂SO₄ = 2.066 x 10⁻⁴
Mass of morphine = moles x molar mass of morphine = 2.066 x 10⁻⁴ x 285.34 
                             = 0.059 g
percent morphine = \frac{mass of morphine}{mass of opium} x 100
                             = \frac{0.059}{0.685} x 100 = 8.6 %   
7 0
3 years ago
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