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slava [35]
3 years ago
6

describe the placement of the crucible lid on the crucible when heating the magnesium. Why is it important that this be done cor

rectly?
Chemistry
1 answer:
Andreas93 [3]3 years ago
7 0
What
:(((((((((((((((((((((
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Which combination of factors is most suitable for increasing the electrical conductivity of metals
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More valence electrons and larger atomic radius are facts most suitable for increasing the electrical conductivity of metals.
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Find the percentage composition of each element in the compound having 9.8 grams of nitrogen,0.7 grams of hydrogen and 33.6 gram
prisoha [69]

Answer: The percentage composition of nitrogen , hydrogen and oxygen is 22.2 % , 1.59 % and 76.2% respectively.

Explanation:

Percentage composition is defined as the ratio of mass of substance to the total mass in terms of percentage.

Percentage composition=\frac{\text {mass of the element}}{\text {Total mass of the substance}}\times 100\%

a) {\text {percentage composition of nitrogen}}=\frac{\text {mass of nitrogen}}{\text {Total mass}}\times 100\%

{\text {percentage composition of nitrogen}}=\frac{9.8g}{9.8+0.7+33.6}\times 100\%=22.2\%

b) {\text {percentage composition of hydrogen}}=\frac{\text {mass of hydrogen}}{\text {Total mass}}\times 100\%

{\text {percentage composition of hydrogen}}=\frac{0.7}{9.8+0.7+33.6}\times 100\%=1.59\%

c) {\text {percentage composition of oxygen}}=\frac{\text {mass of oxygen}}{\text {Total mass}}\times 100\%

{\text {percentage composition of oxygen}}=\frac{33.6}{9.8+0.7+33.6}\times 100\%=76.2\%

The percentage composition of nitrogen , hydrogen and oxygen is 22.2 % , 1.59 % and 76.2% respectively.

4 0
3 years ago
according to the law of conservation of energy, when a lawn mower uses 750 J of chemical energy from gasoline, how much of this
statuscvo [17]
Conservation of energy
all of it should be transformed since the energy is convserved (neither destroyed nor created)
so answer is B
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Commercial utilization of microbial products has become increasingly popular due to their environmentally friendly nature. Produ
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Answer: enzymes.

Explanation:

Microbial products are products derived from microorganisms. They may be primary or secondary metabolites. They are known to be environment friendly since they have biological origin. They are often degraded by enzymes which are also biological molecules. Degradation of materials using enzymes typically generates nontoxic products.

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NaOH and bleach have several characteristics in common. They include all BUT one of the characteristics listed.
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3 years ago
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