Explanation:
A property that does not bring any change in chemical composition of a substance are known as physical properties.
For example, shape, size, mass, volume, density, hardness etc of a substance are all physical properties.
On the other hand, a property that changes chemical composition of a substance is known as chemical property.
For example, precipitation, reactivity, toxicity etc are chemical property.
Therefore, given descriptions are separated according to their physical and chemical properties as follows.
Physical properties:
- Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm3 at .
- Zinc melts at .
Chemical properties:
- When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves.
- It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.
The question is incomplete, here is the complete question:
A chemist measures the amount of nitrogen gas produced during an experiment. She finds that of 282. g of nitrogen gas is produced. Calculate the number of moles of nitrogen gas produced. Be sure your answer has the correct number of significant digits.
<u>Answer:</u> The number of moles of nitrogen gas produced are 10.07 moles
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
We are given:
Given mass of nitrogen gas = 282 g
Molar mass of nitrogen gas = 28 g/mol
Putting values in above equation, we get:
Hence, the number of moles of nitrogen gas produced are 10.07 moles
It would be barium sulfate
Answer:
262.5 mL
Explanation:
21% of 1.25 L volume is methanol, so the amount of methanol is,
0.21 × 1250 mL = 262.5 mL