PHYSICAL SCIENCE Examination 7-Continued Student\'s Name AUBREY SCOT Student Num

Question

PHYSICAL SCIENCE Examination 7-Continued Student's Name AUBREY SCOT Student Number 1H14153 23. Which of the following solutions is more concentrated? (A) two grams of salt in one liter of water (B) 1/2 gram of salt in one liter of water (C) two grams of salt in two liters of water 24· How many molecules are in one mole of H,? (A) its atomic number multiplied by 10 (C) 12.04x 10 (D) none of these. (B) 6.02 x 10 25. How many molecules are in one mole of H.0? (A) its atomic number multiplied by 10 (C) 18.06 x 10 (D) none of these (B) 6.02 x 10 What is the molarity of a 7 molar solution of salt and water? (A) 6.02 x 10% particles of salt per 1 liter of water (B) 1 mole of salt per 7 liters of water (C) 7 moles of salt per one liter of water (D) none of these 26 Answer the following questions in the space provided. 27. Below is the chemical equation for the formation of rust. A. Write the chemical symbols for the product(s). B. Write the chemical symbols for the reactant(s). C. What does (s) stand for in the equation? D. What does (g) stand for in the equation? E. What does the arrow mean? R Why is the equation not a balanced equation? (over)

Explanation / Answer

Solution :-

Q23) 2 g salt in 1 liter water is the most concentrated solution among the listed solution.

Q24) 1 mol of any substance = Avogadros number of molecules

That is 6.02*10^23 molecules

So the answer is option (B)

Q25) 1 mol of H2O = Avogadros number of molecules that is 6.02*10^23 molecules

So the correct answer is option (B)

Q26) molarity = moles / liter

So 7 mole salt / 1 L water = 7 mol/L

So the answer is option (C) = 7 mole salt per liter of water

Q27)

Reaction equation

Fe(s) + O2(g) ----- > Fe2O3(s)

In the reaction equation the species on the left side are called reactants and the species which are on the right side are called products

a)Chemical symbol for the product is = Fe2O3

b) chemical symbol of reactant = Fe and O2

c) (s) means the physical state of the compound is solid state.

d) (g) stands for the gas phase

e) Arrow shown the direction of the reaction means reaction is proceeding to form the products.

f) The number of atoms of the each element are not same on the reactant and product side therefore the equation is not balanced equation.

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