- Study guides, Class notes & Summaries

NON-IDEAL GASES & RAOULTS LAW The ideal gas laws are made up of 2 assumptions. What are they? correct answer: - there is no attractive force between atoms or molecules. - the volume of the gas itself (atoms or molecules) is negligle. What are ideal and real gases? correct answer: - Ideal gases do not have volume and there are no forces between gas molecules. - Real gases do have volume, e.g. halogens Florine, chlorine, bromine, iodine. What is electronegativity? correct answer: a mea...

-

4 pages

Written in 2023/2024

Grade A+

Demetrius

BUFFERS What is a buffer? correct answer: - a buffer resists change in pH when a small amounts of acid or base are added to it. - any solution that contains equal amounts of a weak acid and its conjugate base will act as a buffer. What is acetic acid? correct answer: ethanoic acid. Gives vinegar its distinctive taste. What is buffer capacity? correct answer: the amount of acid or base that can be added to a buffer solution before a significant change in pH occurs What are some ways...

-

3 pages

Written in 2023/2024

Grade A+

Demetrius

Dalton's Atomic Theory correct answer: 1. Each element is composed of atoms 2. all atoms of a given element are identical all same in each individual element but no two elements are the same 3. Atoms can not be recreated by a reaction. Atoms can not be created or destroyed (law of conservation of mass) 4. A given compound always has the same relative number of atoms (law of constant proportions) JJ Thompson correct answer: did a series of plum pudding experiments with cathode ray tubes ...

-

2 pages

Written in 2023/2024

Grade A+

Demetrius

CHEM 1011: Week 5 Questions With Complete Solutions

-

2 pages

Written in 2023/2024

Grade A+

Demetrius

Standard enthalpy of formation correct answer: enthalpy change when it is made from the stable form of its elements at standard condition combustion enthalpy correct answer: exothermic, so always negative atomisation enthalpy correct answer: endothermic, so always positive ∆H(rxn)= correct answer: ∑∆Hºf(products) - ∑∆Hºf(reactants) standard enthalpy of formation correct answer: change of enthalpy during the formation of one mole of the substance from its constituent ...

-

3 pages

Written in 2023/2024

Grade A+

Demetrius

UNE week 1/2 chem review, UNE week chem 1011 3-4 review, UNE Chem 1011 week 5-7 review Questions With Complete Solutions

-

9 pages

Written in 2023/2024

Grade A+

Demetrius

What concentration of phosphate would give you a percent transmittance of 35%? correct answer: To find this we turn %T into an absorbance value, then we plug into the equation A = k * c. We know k from the slope of our line (in this case we will use the sample given 1245) and we calculate A from the %T. We then divide to find C, which is our concentration aka molarity. In this case it comes out to 3.7 x 10⁻⁴ = M. A worker dumps 20 grams of detergent that is 30% by weight phosphate ion in...

-

4 pages

Written in 2023/2024

Grade A+

Demetrius

UNE Chem 1011 Questions With Complete Solutions

-

24 pages

Written in 2023/2024

Grade A+

Demetrius

Kinetics correct answer: The rate or speed of a reaction. A rapid reaction does not mean it goes to completion Equilibrium correct answer: The extent of a reaction Why is the rate of reaction important? correct answer: Industrial, biochemical, environmental, health What sort of factors effect the rate of a reaction? correct answer: Concentration of reactants, physical states of reactants, temperature, the use of a catalyst Effect of concentration correct answer: RATE OF REACTION...

-

21 pages

Written in 2023/2024

Grade A+

Demetrius

Chem 1011 Final Questions And Answers With Complete Solutions

-

10 pages

Written in 2023/2024

Grade A+

Demetrius

For the reaction F2(g) ⇌ 2 F(g), the equilibrium constant at 223 °C is 7.3 x 10-13. If a sample of F2 is heated to 223 °C and allowed to reach equilibrium correct answer: nearly all of F2 will remain unreacted, with a very small amount of F present At equilibrium correct answer: the rate of the forward reaction is equal to the rate of the reverse reaction and the concentration of the reactants and products can be very different For the reaction 2 BrCl(g) ⇌ Br2(g) + Cl2(g), the equi...

-

5 pages

Written in 2023/2024

Grade A+

Demetrius

chem 1011 final Questions With Complete Solution

-

11 pages

Written in 2023/2024

Grade A+

Demetrius

Which of the following is always true? -Spontaneous changes cause an increase in the entropy of the universe -Heat will flow from a cooler object to a hotter object -Processes that involve an increase in entropy of the system are spontaneous -The change in entropy of the universe is the same as the change in entropy of the surroundings correct answer: Spontaneous changes cause an increase in the entropy of the universe A pure, perfectly crystalline solid at 0 K correct answer: has zero ...

-

10 pages

Written in 2023/2024

Grade A+

Demetrius

UNE chem 1011 final Questions With Complete Solutions

-

5 pages

Written in 2023/2024

Grade A+

Demetrius

CHEM 1011 Midterm Questions With Complete Solutions

-

6 pages

Written in 2023/2024

Grade A+

Demetrius

Representative Elements correct answer: Groups 1, 2, 13-18 The outer e- belongs to 's' or 'p' groups Metals correct answer: Elements that readily lose electrons (form cation), giving them a high heat and electrical conductivity levels, high luster and variety of hardness Nonmetals correct answer: Readily gain e-, do not generally conduct heat/electricity Usually liquids and gases, some soft solids Metalloids correct answer: Elements that may accept or donate electrons readily ...

-

4 pages

Written in 2023/2024

Grade A+

Demetrius

What are the 3 largest components of our atmosphere? correct answer: Nitrogen - 78% Oxygen - 21% Argon - 1% How is the periodic table arranged? correct answer: By how elements bond What row are the Halogens? correct answer: 7A - Second from the right What row are the Noble Gases? correct answer: 8A - Far right What is unique about the Noble Gases? correct answer: They are stable and don't like to bond What row are the Alkali Metals correct answer: 1A - Far left What ar...

-

3 pages

Written in 2023/2024

Grade A+

Demetrius

pure substance correct answer: A sample of matter, either a single element or a single compound, that has definite chemical and physical properties Examples of pure substances correct answer: elements, compounds, water, table salt (sodium chloride), ethanol, gold, bronze, etc. Mixture correct answer: A combination of two or more substances that are not chemically combined homogeneous mixture correct answer: A mixture in which substances are evenly distributed throughout the mixture ...

-

6 pages

Written in 2023/2024

Grade A+

Demetrius

Strong electrolytes: ciate almost completely into ions in solution b. only yield a small fraction of ions in solution c. are always dissolved ionic compound d. Can not be covalent compounds correct answer: a. dissociate almost completely into ions in solution Hexane is commonly used in labs as solvent for non polar compounds. what is the molality of 22.3 mg of vitamin D (C27H44O, 384.6 g/mol) in 50 mL of hexane? Hexane has a density of 0.661 g/mol correct answer: 1.75 X 10^-3 m A...

-

24 pages

Written in 2023/2024

Grade A+

Demetrius