Chemistry in Daily Life Questions and Answers

The rate of a reaction depends on Select one O a the frequency of collisions between reactants O b the energy of collisions between reactants O c the orientation of collisions between reactants O d all of these O e none of these

The first order reaction AB is initiated with A o 0 828 M It takes 24 1 seconds for the reaction to proceed until A 0 277 M Based on this information what is the half life for this reaction Please report your answer to 3 significant figures

8 Rank the following substances from greatest to least ability to change the colligative properties of water Explain your answer 1 a LiCl b C6H12O6 c AlBr3 9 Calculate the freezing point and boiling point of a solution made by dissolving 168 0 grams of sodium bicarbonate NaHCO3 in 1000 0 grams of water 10 Determine the freezing point and boiling point of a 2 0 m solution of potassium chloride KCI 11 Two equally sized beakers are placed on a laboratory bench One beaker is filled with distilled water A second beaker is filled with a saturated solution of sugar Which will completely evaporate first Explain your answer 12 In northern Utah the temperature falls well below freezing in the winter Would you expect the Great Salt Lake to be safe for such winter sports as hockey or ice skating Explain your answer

10 Draw the major products obtained in each of the following reactions indicating stereochemistry where appropriate If no reaction is anticipated write no reaction O O

What is the percent yield of zinc nitrate when 4 02 moles silver nitrate is reacted with excess zinc chloride and 99 0g of zinc nitrate is produced Molar Mass of AgNO3 169 87g mol Molar Mass of Zn NO3 2 189 36g mol ZnCl2 2AgNO3 2AgCl Zn NO3 2 28 9 57 9 52 0 26 0

1 What are the 4 assumptions of the kinetic molecular theory of gases 2 Convert 1011 5Pa to atmospheres 3 Your cat weighs 32 0 pounds It has four paws each one with an area of 1 0 square inches What pressure does your cat put on you when standing in pounds per square inch 4 The ideal gas law gives us PV nRT Solve this for n 5 For a two state problem where there is an initial and final state P V n T P V n T which are both equal to R In the case of constant temperature and volume T T and V V Solve this equation for P in this case it will be a function of P n and n only 6 A gas at 512K and 701torr is heated to 709K What is the final pressure if moles and volume are constant 7 3 00mol of gas at 79 C and 100 123Pa of pressure would have what volume 8 A reaction is performed at constant temperature and volume 5 00moles of reactant gases are put into the container originally The pressure increases from 1 20atm to 1 91atm How many moles of gases are in the container at the end 9 Extra Credit 1 000 mol of CH3CH OH gas is combusted with 2 000 mol of O2 gas in a container of constant volume and temperature and the pressure increases from 1 500atm to 1 551atm What is the yield

What best explains why the formation of ionic solids is exothermic Select one O a The formation of an ionic solid from gaseous cations and anions releases ene O b Chemical reactions always release energy O c Metals want to lose electrons and nonmetals want to gain electrons O d None the formation of ionic solids is not usually exothermic

C6H12O6 s 502 g 6CO2 g 6H O l Is the above reaction consistent with the law of conservation of mass Explain using the law of conservation of mass

Atomic P Hydrogen EN O Atomic P nents in the space below Beryllium EN STATES Atomic P E Fluorine N O Argon Atomic P E N

Upload a photo of a drawing or a graphic for this question C6H12 l 902 g 6CO2 g 6H2O g 1 Draw particles to show how the reaction above is consistent with the law of conservation of mass 2 Explain how your particle model shows mass is conserved

Predict the major product for the reaction shown 100 of ob E AICI III 11 IV

1 An organic food is defined as something that contains organic chemicals 2 The boiling point for normal alkanes will decrease as the number of carbons increase

Consider the Lewis structure of the sulfate ion SO42 where all the atoms obey the octet rule What is the formal charge of sulfur 2 0 2

What is the percent by mass of Carbon in CO₂?

Expired air is 3.90% CO₂. What is the partial pressure of CO₂ in atm if the total pressure is 0.900 atm ? A. 4.80 atm B. 3.51 atm C. 0.0351 atm D. 0.0433 atm

Consider the reaction 2N₂O(g) + 30₂(g) = 4NO₂(g) Exactly 0.0566 mol of O₂ and 0.014 mol of N₂0 were placed into a 500 ml. flask. The equilibrium concentration of NO₂ was 0.026 M. What is the value of K for this reaction?

Many times errors are expressed in terms of percentage. The percent error is the absolute value of the difference of the true value and the experimental value, divided by the true value, and multiplied by 100. Percent error=|true value-experimental value |/true value x 100 Calculate the percent error for the following measurements. a. The density of an aluminum block determined in an experiment was 2.68 g/cm³. (True value is 2.70 g/cm³.) b. The experimental determination of iron in iron ore was 16.64%. (True value is 16.15%.) Percent error= c. A balance measured the mass of a 1.000-g standard as 0.9945-g. Percent error=

The volume of a gas was 53 mL when the temperature was 163.4 °C. If the temperature was initially 10.4 °C, and there was no change in the pressure, what was the initial volume of the gas? a. 34 b. 63 c. 92 d. 3.4

Malcolm X would support which of the following? Using boycotts and non-violent protest to increase white support for integration. Fighting segregation through a series of court cases. African Americans becoming economically self-sufficient and separating from white society. Rioting until the federal government agreed to African Americans' demands for civil rights.

Which of the following atoms has a larger radius, C or F? Explain the reason. Do not simply restate the trend but rather explain why the trend exists.

Examine the biochemical reaction below: CH3CH₂OH + NAD+ <--> CH3CH+ NADH + H+ Which of the following products results from an oxidation of the substrate in the above reaction? EtOH NAD+ NADH Acetaldehyde

Life is a(n) _ never comes to equilibrium. Energetic Irreversible Reversible Combustible process, such that it

If the ions Fe+2 and O-2 react, what ionic formula will result? Fe+2O-2 Fe²O2 FeO Fe³O²

Explain how iconic and covalent bonds are similar and how they are different. Give an example of two elements that would ionically bond, and two elements that would covalently bond.

Which of the following is an ionic compound? NH3 CH4 Na₂O C12H22011

Calculate the density of a substance occupying a volume of 270.0 mL and having a mass of 120.5 g. 0.4463 g/mL 2.241 g/mL 3.254 x 104 g/mL 270.0 g/mL

Industrial agriculture requires A. no fertilizer B. large amounts of water C. no pesticides D. only renewable energy sources

What volume of hydrogen gas, at standard conditions (STP), can be liberated by the reaction of sulfuric acid with 0.067 g Mg? Write a balanced equation for the reaction? Determine the volume of H₂ liberated? In a different trial but same experiment, calculate the mass of magnesium metal that should be used to generate 50.0 mL of H₂ at standard conditions.

Refer to the following unbalanced equation: C6H14+ O2 CO2 + H₂O What mass of oxygen (O₂) is required to react completely with 19.5 g of C6H14? 5.93 × 10³ g 34.4 g 7.24 g 68.8 g 0.226 g

1. When a sample of solid at 35°C (specific heat capacity = 0.89 J/g "C) is heated using 75.5J of energy, its temperature was raised to 48°C. What is the mass of this solid ? Give your answer using the correct significant figure

Select the formula unit for the compound that consists of iron(II) and the phosphide ion. Fe₂P Fe3P2 FePO4 FeP2 FeP

How many moles of CO₂(g)are produced when 10 moles of O₂(g) react by the reaction C(s) +O₂(g)→→ CO₂(g) Assume all reactants and products are at the same temperature and pressure. 5 10 15 20

The element with atomic number 30 is a transition element a non-metal a noble gas an alkali metal

A person fully reacts 0.75mol of magnesium metal with excess hydrochloric acid (HCI) according to the reaction below. If the products are at a pressure of 1.5atm and a temperature of 50°C, what volume of hydrogen gas was formed? (R=0.0821) Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) 123.2L 9.5L 19.9L 13.3L 0.0754L

Explain the following trends in acidity same as yo did in question 2 FCH₂COOH > CICH₂COOH > CH3COOH>CH3CH₂OH

Write the curved arrow mechanism for the protonation of imidazole. Use H* (the proton) as the acid. Look at the "availability" of the lone pairs and resonance after protonation (resonance stabilization), to decide which one of the two nitrogens to protonate.

The FHA/VA Loan Addendum is used if (a) The seller needs to inform buyers of multiple offers. (b) The buyer is going to apply for an FHA or VA loan. (c) The buyer wants an inspection or assessment. (d) The renter wants to purchase the property.

In a chemical reaction that takes place at a fixed pressure and volume in a calorimeter, the enthalpy change (AH) is 585 kJ/mol. Will this reaction result in an increase or a decrease in the calorimeter's water temperature? There is not enough information to know if the temperature will increase or decrease. There will be a decrease in temperature. There will be no change in temperature. There will be an increase in temperature.

Iron metal reacts with a copper sulfate solution, CuSO4(aq) Which of the following would result in the lowest rate of reaction? A solid piece of iron in 1 M CuSO4(aq) Iron powder in 1 M CuSO4(aq) Iron powder in 2 M CuSO4(aq) A solid piece of iron in 2 M CuSO4(aq)

On the basis of their electron configurations, predict the formula of the simple binary ionic compounds likely to form when the following pairs of elements reacts with each other. a. aluminum, Al, and selenium, Se: b. magnesium, Mg, and oxygen, O: c. lithium, Li, and arsenic, As:

BaCO3 + 2HNO3 → Ba(NO3)2 + CO₂ + H₂O What mass of barium nitrate can be formed by the reaction between 75.0 g barium carbonate and 35.00 g nitric acid? Then calculate how much excess reactant is left over.

How does a catalyst alter a potential energy diagram? it decreases the required activation energy it decreases the heat of products it decreases the heat of reaction it decreases the heat of reactants

You just discovered a new element who has similar properties as Oxygen. Which of the following would be TRUE? The element is Joke and the symbol is Jo. Jo²+ The ion would be Joke ion. Jo²- It is a transition metal. Jo+

A chemist must dilute 92.8 mL of 14.1 mM aqueous calcium sulfate (CaSO4) solution until the concentration falls to 3.00 mM. She'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Round your answer to 3 significant digits.

Ascorbic acid, or vitamin C (C6H806, molar mass = 176 g/mol), is a naturally occurring organic compound with antioxidant properties. A healthy adult's daily requirement of vitamin C is 70-90 mg. A sweet lime contains 2.86×10-4 mol of ascorbic acid. To determine whether the ascorbic acid in a sweet lime meets the daily requirement, calculate the mass of ascorbic acid in 2.86×10-4 mol of ascorbic acid. Express the mass in grams to three significant figures.

Which of the following is NOT a true statement? Strong bases produce large quantities of hydroxide ions. Weak acids ionize partially in water. Strong bases react with strong acids to make salt and water. Strong acids produce large quantities of hydronium ions. Weak bases are good electrolytes.

A flexible container at an initial volume of 7.14 L contains 3.51 mol of gas. More gas is then added to the container until it reaches a final volume of 16.7 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.

The reaction 2 NO(g) + 2 H₂(g) ---> N₂ (g) + 2 H₂(g) follows second-order kinetics. At 200°C, [NO] drops from 0.200 M to 0.0250 M in 100.0 s. The rate constant for the reaction is -0.350 0.350 3500 0.0208 -0.0208

The unbalanced equation below shows the combustion of methane. _CH4 + _O2 ---> _CO₂ + _H₂O Which series of numbers represents the coefficients necessary to balance the equation? 2, 2, 1, 4 0, 3, 2, 2 1, 1, 1, 2 1, 2, 1, 2

Examine each of these chemical equations to determine which equation is correctly balanced. Mg(NO3)₂ +K₂CO3 → MgCO3 + KNO3 Mg(NO3)2 +2K₂CO3 → MgCO3 + 2KNO3 2Mg(NO3)₂ +K₂CO3 → 2MgCO3 + KNO3 Mg(NO3)2 +K₂CO3 → MgCO3 + 2KNO3