Question

Please help me solve this homework problem. I have the problem done I just want to check my answers to make sure they are correct. Here is a picture of the blank page.

2) Which of the following is an example of a quantitative observation? a) The piece of metal is longer than the piece of wood. b) Solution 1 is much darker than solution 2. c) The liquid in beaker A is blue. d) The temperature of the liquid is 60°C. At least two of the above (A-D) e) 3) The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus a) 75 protons, 75 neutrons b) 75 protons, 130 neutrons c) 130 protons, 75 neutrons d) 75 protons, 110 neutrons e) not enough information 4) Which of the following 100.0 g samples contains the greatest number of atoms: a) Magnesium b) Chlorine c) Zinc d) Silver e) They all have the same number of atoms 5) Which of the following reaction mixtures could produce the greatest amount of product? Each involves the reaction symbolized by the equation: 2H2 + 02→ 2H20 A) 2 moles of H2 and 2 moles of 02 B) 2moles of Hz and 3 moles of 02 C) 2 moles of H2 and 1 mole of 02 D) 3 moles of H2 and 1 mole of 02 E) Each produce the same amount of product. Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). What is the identity of element X? a) b) Al c) d) e) Sr 6) Cu Ni Si

Answer 1

As per HOMEWORKLIB POLICY, I can give full solution to only 1st question. However I will try to give just answer to a few more:

2) A quantitative observation always records data in the form of a numerical quantityand can be interpreted analytically.

Like if a Temperature is recorded then if we say its hot, then it is a qualitative data but if we say it is at 120C then we have quantified that data.

Similarly if something is longer(qualitative) we can write is quantitatively by saying it is longer by 10cm or so.

Based on this, the correct answer will be Option D

4) Magnesium ( least Molar Mass)

5) Option E ( the excess will remain. Concept of limiting reactant is used.)

6) Option D.

Calculated mass = 28.113 amu. which is similar to that of Si.