Lec 1 Flashcards by Ella Angelan

The lining of the stomach contains cells that secrete a solution of HCl. Which drink would best alleviate heartburn, i.e., excess acid in the stomach?

milk of magnesia (pH 10.5)

stomach nature -> acidic

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Which of the following is NOT an acid-base conjugate pair?
A. NH3 and NH4+
B. H2S and OH–
C. H2O and OH–
D. HCN and CN–

H2S and OH–

(no relation with each other)

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When ammonium chloride hydrolyzes, the resulting solution will have a pH

pH value of acidic is low, H+ is high if acidic

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Which of the following conjugate acid/base pairs should be used to prepare a buffer with pH near 7.15

sodium dihydrogen phosphate and sodium hydrogen phosphate (pKa2 7.20)

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What are the product(s) for the reaction between HNO3 and NH4OH?

NH4NO3 + H2O

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When Cr3+ changes from an oxidation state of +3 to +6, Cr3+ will

lose 3 electrons

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6 Strong Acids

HCl
HBr
HI
HClO4 an HClO3
H2SO4
HNO3

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6 Strong Base

Li(OH)
Na(OH)
K(OH)
Mg(OH)2
Ca(OH)2
Ba(OH)2

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1.How do you recognize an acid by formula

1.Starts with H

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2.What ion do acids produce in water

2.H⁺ or H₃O⁺ ions

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4.How do you recognize a base by formula

4.Ends with OH

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5.What ion do bases produce in water

5.OH⁻ ions

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7.How do you recognize a salt

7.Cation + anion not H⁺ or OH⁻ (e.g. NaCl)

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8.Does the cation in a salt always come from a metal or base

8.Yes, usually from a metal or base

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9.How do you recognize a carbonate

9.Contains CO₃²⁻

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10.How do you recognize a bicarbonate

10.Contains HCO₃⁻

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11.How do you recognize a metal

11.Element on the left of periodic table

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12.How do you recognize a nonmetal

12.Element on the right of periodic table

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13.What happens when acid and base react

13.Salt + water

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14.What happens when acid and metal carbonate react

14.Salt + water + CO₂

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15.What happens when acid and metal react

15.Salt + hydrogen gas

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16.What happens when two salts react

16.Ion exchange, may form precipitate

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17.What happens when hydrocarbon reacts with oxygen

17.Combustion forms CO₂ + H₂O

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18.Identify the reaction 2Mg + O₂ → 2MgO

18.Combination / Synthesis

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22.What usually causes decomposition reactions to occur

22.Heat, light, or electricity

23.Write the decomposition of calcium carbonate

23.CaCO₃ → CaO + CO₂

24.Identify the reaction Zn + 2HCl → ZnCl₂ + H₂

24.Single displacement

25.In the reaction Zn + 2HCl → ZnCl₂ + H₂ which element is displaced

25.Hydrogen is displaced

29.Write the products of BaCl₂ + Na₂SO₄ → ?

29.BaSO₄ + 2NaCl

30.Identify the reaction H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

30.Neutralization

31.What are always formed in a neutralization reaction

31.Salt + water

32.What are the products of HCl + KOH

32.KCl + H₂O

33.Identify the gas evolved 2HCl + Na₂CO₃ → 2NaCl + H₂O + ?

33.CO₂ gas

34.What type of reaction occurs between acid and carbonate

34.Gas evolution

35.Write the products of H₂SO₄ + CaCO₃

35.CaSO₄ + H₂O + CO₂

36.Identify the products CH₄ + 2O₂ → ?

36.CO₂ + 2H₂O (combustion)

37.What are always produced in a complete combustion reaction

37.CO₂ and H₂O

38.What type of reaction is burning of propane

38.Combustion

41.What is the clue for a redox reaction

41.Change in oxidation number or electron transfer

42.What forms when AgNO₃(aq) reacts with NaCl(aq)

42.AgCl(s) + NaNO₃(aq)

43.How do you recognize a precipitation reaction

43.A solid (↓) forms from clear solutions

44.Name the precipitate in BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

44.BaSO₄

45.Identify the reaction 2H₂O₂ → 2H₂O + O₂

45.Decomposition / redox

47.Identify the product Cu²⁺ + 4NH₃ → ?

47.[Cu(NH₃)₄]²⁺

48.What is the clue that a complex is formed

48.Product inside square brackets

49.What type of reaction occurs inside a battery

49.Electrochemical (redox)

50.In Zn + Cu²⁺ → Zn²⁺ + Cu which is the anode

50.Zn is the anode

51.What type of reaction is rusting of iron

51.Redox (oxidation of Fe)

52.What type of reaction is photosynthesis

52.Combination (light-driven)

53.Which reaction type usually produces bubbles or fizzing

53.Gas evolution

54.Which reaction type is always exothermic

54.Combustion

55.Which reaction involves ion exchange and may form a precipitate

55.Double displacement

56.What is produced when acid reacts with carbonate

56.Salt + water + carbon dioxide

57.What are the products when base reacts with acid

57.Salt + water

The part of an electrochemical cell where oxidation occurs

anode

during the electroplating of silver, silver ions in solution

are reduced at the cathode

In an electrolytic cell, oxidation occurs

at the anode

product for: acid + metal carbonate/bicarbonate

product for: acid + metal

salt + H2 (gas)

Cu²⁺, Fe²⁺/Fe³⁺, Co²⁺, Ni²⁺, Zn²⁺, Ag⁺, Al³⁺, Cr³⁺, etc. added to ligand (NO2, NH3, SCN, CN, H2O, Cl, OH)

metal–ligand complex

1. Which of the following statements BEST describes a primary method? I. Set of instructions about how to carry out a method issued by a national standards body. II. It has the highest metrological qualities. III. Method that employs the use of materials such as certified reference materials. IV. Titration of hydrochloric acid with anhydrous sodium carbonate to determine the concentration of the acid is an example of this method.

II &IV

It is the fraction of the named material present in the stated chemical form.

PURITY

If you reported that a sample with 9 mg/L of a substance has only 5 mg/L and the acceptable limit according to standard is 7 mg/L, this is

FALSE +

It is a performance parameter that could be used to analyze a blank sample matrix.

Limit of detection

Which of the following factors affects the choice of analytical methods? A. The type of analysis required B. The accuracy required C. Possible interferences from components of the material other than those of interest. D. All of the above

All of the above

Chemical grade commonly used for low-grade applications such as cleaning and qualitative testing?

Technical Grade

In the determination of sugar concentration in powdered juice dissolved in water, which of the following is the matrix? A. sugar B. powdered juice C. water D. B and C

B and C

Which of the following is are TRUE about instrumental background signal? I. Even when no sample is being analyzed, the instrument will be generating a background signal. II. LOD for an instrument improves if the S/N can be increased. III. LOD for an instrument is not affected by S/N.

I AND II

The portion of the calibration curve which includes the range of concentrations of analyte that can be determined with demonstrated precision, accuracy, and response function.

Working range

The property of an analytical method to determine simultaneously several components independently from each other.

Selectivity

Lec 1 Flashcards

(71 cards)