CHEMISTRY HIGH SCHOOL

What phrase describes a good scientific question?has a wide focus
addresses a gap in knowledge
does not lead to a testable hypothesis
O has a simple yes or no answer
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Answers

Answer 1
Answer: address a gap in knowledge

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1. You were tasked to check if the liquid sample you have is a substance or a mixture.Which among these tasks is the BEST way to do so?1. Color comparisonIl. Taste comparisonIII. Boiling Testiv.Melting Test
All the elements of a family in the periodic table have what feature in common? A) They all have similar chemical properties. B) They all have the same number of protons in the nucleus. C) They are all located in the same horizontal row or period. Eliminate D) They all have the same number of electrons in the electron cloud.

Which change is exothermic?(1) freezing of water(2) melting of iron(3) vaporization of ethanol(4) sublimation of iodine

Answers

The answer is (1) freezing of water. The energy of different status is increase from solid to liquid to gas. So the change of liquid to solid is exothermic. The other three are endothermic.

The gram formula mass of NH4Cl is(1) 22.4 g/mole (3) 53.5 g/mole(2) 28.0 g/mole (4) 95.5 g/mole

Answers

Answer: Option (3) is the correct answer.

Explanation:

Gram formula mass or molar mass is the sum of mass of all the individual  atoms present in the compound or formula.

For example, gram formula mass of NH_(4)Cl is calculated as follows.

     NH_(4)Cl = Mass of N + 4 * mass of H + mass of Cl

                            = (14.00 + 4 * 1.00 + 35.45) g/mol

                             = (14.00 + 4.00 + 35.45) g/mol

                             = 53.45 g/mol

                             = 53.5 g/mol (approx)

Thus, we can conclude that the gram formula mass of NH_(4)Cl is 53.5 g/mol (approx)

The gram formula mass of NH₄Cl is 53.5 g/mol (3rd option)

How to determine the gram formula mass?

The gram formula mass of a compound is simply the molar mass of the compound.

The gram formula mass of NH₄Cl can be obtained as illustrated below:

  • Molar mass of N = 14 g/mol
  • Molar mass of H = 1 g/mol
  • Molar mass of Cl = 35.5 g/mol
  • Gram formula mass of NH₄Cl = ?

Gram formula mass of NH₄Cl= 14 + (4 × 1) + 35.5

= 14 + 4 + 35.5

= 53.5 g/mol

Thus, we can conclude that the gram formula mass of NH₄Cl is 53.5 g/mol (3rd option)

Learn more about gram formula mass:

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What is the difference in a transverse and a longitudinal wave?Group of answer choices

Transverse waves are bigger than longitudinal waves

A transverse wave has crests and troughs and a longitudinal has compressions and rarefactions.

Transverse waves are sound waves and longitudinal waves are light waves.

Answers

Answer:

A transverse wave has crests and troughs and a longitudinal has compressions and rarefactions.

The two ways that energy can be transferred are as heat or as work. True or False?

Answers

the correct answer would be false

The answer is True, I've taken this test.

Which chemical equation best illustrates the Law of Conservation of Mass? (My answer: D)2H2O yields H2 + O2

CH4 + 3O2 yields CO2 + 2H2O

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Zn + 2HCl yields ZnCl2 + H2

Answers

It its definitely D.

What produces hydrogen ions as The only positive ions in aqueous solution

Answers

Mostly acids produces H+ ions. Acids dissociates into ions when in aqueous form resulting to hydronium or hydrogen ions and the other ion which has a negative charge. For instance, hydrochloric acid, it dissociates into H+ and Cl-.
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