Chemistry week 2 recitation worksheet (2021-2022) PDF

Preview

Summary

Pre recitation assignment. Students are required to write down the information that is helpful for solving problems....

Description

CHEM 101 2020 – Recitation Week 2 Ch. 1, 37 Classify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. Sweat Homogeneous mixture b. Carbon dioxide Pure compound c. Aluminum Homogeneous mixture d. Vegetable soup Heterogeneous mixture Ch. 1, 40 Complete the table: Substance Aluminum Apple juice Hydrogen peroxide Chicken soup

Pure or mixture Pure Mixture Pure Mixture

Type element homogeneous compound heterogeneous

Ch. 1, 48 An automobile gasoline tank hold 21 kg of gas. When the gasoline burns, 84 kg of oxygen is consumed, and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide and water that is produced? Everything combined = 21+84 = 105 kg. Weight of Carbon = 12, weight of Oxygen = 16, weight of hydrogen = 1.

Ch. 1, 52 Upon decomposition, one sample of magnesium fluoride produces 1.65 kg of magnesium and 2.57 kg of fluorine. A second sample produces 1.32 kg of magnesium. How much fluorine (in grams) does the second sample produce?

Ch. 1, 64 Which statements about subatomic particles are false? a. b. c. d.

Protons and electrons have charges of the same magnitude but opposite sign. Protons have about the same mass as neutrons. Some atoms don’t have any protons. Protons and neutrons have charges of the same magnitude but opposite signs.

Ch. 1, 66(a,c) Write isotopic symbols in the form 𝑋 for each isotope: a. The copper isotope with 34 neutrons

c. The potassium isotope with 21 neutrons.

Ch. 1, 88 What is the mass of 4.91 x 10^21 platinum atoms?

Ch. 1, 102 Fill in the blanks to complete the table: Symbol

Z

Si

14

S2-

A

Number of p+

Number of e-

Number of n

14

14 2-

32

Cu2+

34 15

Charge

15

16

2+

Ch. 1, 117 Naturally occurring magnesium has an atomic mass of 24.312 and consists of three isotopes. The major isotope is 𝑀𝑔 , natural abundance 78.99%, relative atomic mass 23.98504. The next most abundant isotope is 𝑀𝑔, the relative atomic mass 25.98259. The third most abundant isotope is 𝑀𝑔, whose natural abundance is in the ratio of 0.9083 to that of 𝑀𝑔 . Find the relative atomic mass of 𝑀𝑔 .

Honors only Ch. 1, 97 A 7.83 g sample of HCN contains 0.290 g of H and 4.06 g of N. Find the mass of carbon in a sample of HCN with a mass of 3.37.

Ch. 1, 125 Without doing any calculations, determine which of the samples contains the greatest amount of the element in moles. Which contains the greatest mass of the element? a. 55.0 g Cr b. 45.0 g Ti c. 60.0 g Zn...