Chemistry

The order in which a mixture of sand; ammonium chloride and sodium chloride can be separated is?The order in which a mixture of sand; ammonium chloride and sodium chloride can be separated is?

The order in which a mixture of sand; ammonium chloride and sodium chloride can be separated is?

A. dissolution → dryness → filtration → evaporation B. filtration → sublimation → evaporation → dryness C. sublimation → dissolution…

5 years ago
A decrease in atomic size and an increase in nuclear charge across a period lead to?A decrease in atomic size and an increase in nuclear charge across a period lead to?

A decrease in atomic size and an increase in nuclear charge across a period lead to?

A. an increase in the tendency to lose an electron B. an increase in chemical reactivity C. a decrease in…

5 years ago
The element with the electron configuration 1s²2s²2p³ is?The element with the electron configuration 1s²2s²2p³ is?

The element with the electron configuration 1s²2s²2p³ is?

A. calcium B. chlorine C. oxygen D. nitrogen Correct Answer: Option D - nitrogen

5 years ago
What is the molar mass of a substance; if 0.4 mole of the substance has a mass of 25.0g?What is the molar mass of a substance; if 0.4 mole of the substance has a mass of 25.0g?

What is the molar mass of a substance; if 0.4 mole of the substance has a mass of 25.0g?

A. 62.5 g B. 40.0 g C. 6.3 g D. 2.5 g Correct Answer: Option A - 62.5 g Explanation…

5 years ago
Nuclear fission involves the splitting of a heavy element into two nuclei of?Nuclear fission involves the splitting of a heavy element into two nuclei of?

Nuclear fission involves the splitting of a heavy element into two nuclei of?

A. nearly equal masses with a release of energy and radiation B. equal masses with a release of energy C.…

5 years ago
The volume of 2.5 moles of oxygen at s.t.p is? [Molar volume of a gas at s.t.p = 22.4 dm³]The volume of 2.5 moles of oxygen at s.t.p is? [Molar volume of a gas at s.t.p = 22.4 dm³]

The volume of 2.5 moles of oxygen at s.t.p is? [Molar volume of a gas at s.t.p = 22.4 dm³]

A. 50.0 dm³ B. 84.0 dm³ C. 28.0 dm³ D. 56.0 dm³ Correct Answer: Option D - 56.0 dm³ Explanation…

5 years ago
A difference between chemical and physical change is that in a chemical change?A difference between chemical and physical change is that in a chemical change?

A difference between chemical and physical change is that in a chemical change?

A. oxygen is consumed B. heat is supplied C. a reversible process occurs D. a new substance is formed Correct…

5 years ago
A particle that contains 11 protons; 12 neutrons and 10 electrons is probably a?A particle that contains 11 protons; 12 neutrons and 10 electrons is probably a?

A particle that contains 11 protons; 12 neutrons and 10 electrons is probably a?

A. neutral non-metal B. metallic ion C. non-metallic ion D. neutral metal Correct Answer: Option B - metallic ion

5 years ago
When a crystal was added to the clear solution of its salt; the crystal did not dissolve and the solution remained unchange. This showed that the solution was?When a crystal was added to the clear solution of its salt; the crystal did not dissolve and the solution remained unchange. This showed that the solution was?

When a crystal was added to the clear solution of its salt; the crystal did not dissolve and the solution remained unchange. This showed that the solution was?

A. supersaturated B. concentrated C. unsaturated D. saturated Correct Answer: Option D - saturated

5 years ago
Water has the ability to dissolve almost all substance because its molecules has a structure with?Water has the ability to dissolve almost all substance because its molecules has a structure with?

Water has the ability to dissolve almost all substance because its molecules has a structure with?

A. one positive end and one neutral end B. one positive end and one negative end C. two negative ends…

5 years ago
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