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Chemistry quiz!
Chemistry quiz!
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1
Green chemistry seeks safer and more sustainable chemical processes. The following experiment is being conducted:
\frac{0.50\times30\times60\times64}{96500\times2}
\frac{0.50\times30\times64}{96500}
\frac{50\times0,50\times64}{1000}
\frac{0.50\times30\times60\times64}{96500}
2
🤑No me entra la pregunta🤑
I, II and III
I and II only
I and III only
II and III only
3
Gallium (Ar = 69.72) consists of two stable isotopes, Ga-69 and Ga-71. What is the relative abundance of Ga-71?
36%
24%
60%
40%
4
Which solutions have a wavelength of maximum absorbance different from 0.10 mol/dm³ FeSO₄?
II and I
I II and III
II and III
III and I
5
¿What is the ratio of [H⁺] in ethanoic acid (pH = 3) with respect to [H⁺] in water at 298K?
10⁴:1
1:10⁴
3:7
7:3
6
The formula for praseodymium phosphate is PrPO₄. What is the formula for praseodymium oxide? Consider: Mr=140.91
PrO
PrO₂
Pr₂O
Pr₂O₃
7
Which of the following molecules is polar?
BeCl2
BCl3
C12H26
NCl3
8
What is correct when ∆H - T∆S = 0?
The inverse reaction is non-spontaneous
∆H>∆S at high temperatures
ΔG=-RTlnQ
The system is in equilibrium
9
Which of the following sequences has the oxides arranged according to their acidity in increasing order?
Na₂O < Al₂O₃ > SO₃
Al₂O₃ >Na₂O > SO₃
Na₂O < Al₂O₃ < SO₃
Na₂O> SO₃> Al₂O₃
10
Which reaction is spontaneous under standard conditions?
Mn²⁺(aq) + Fe(s) → Mn(s) + Fe²⁺(aq)
Fe²⁺(aq) + Mn(s) → Fe(s) + Mn²⁺(aq)
Mn²⁺(aq) + Pb(s) → Mn(s) + Pb²⁺(aq)
Fe²⁺(aq) + Pb(s) → Fe(s) + Pb²⁺(aq)
11
What is the mass of a C
60
molecule?
720 g
720000 mg
1.2·10-21 g
1.2·10-25 mg
12
¿Which of these elements has more than one oxidation state?
Bromine
Potassium
Fluorine
Calcium
13
In a redox reaction, what is a reducing agent?
Substance that oxidizes, meaning it loses electrons
Substance that oxidizes, meaning it gains electrons
Substance that oxidizes, but only in a neutral PH
Substance that makes another reducing agent gain electrons
14
The following equations represent reactions that occur spontaneously. What would be their order in reactivity?
Ni < Sn < Zn < Fe
Sn >Fe > Ni > Zn
Sn < Ni < Fe < Zn
Zn < Fe < Ni < Sn
15
What is the order of increasing boiling points for the isomers of C5H12?
CH₃C(CH₃)₃ < CH₃CH₂CH₂CH₂CH₃ < CH₃CH(CH₃)CH₂CH₃
CH₃C(CH₃)₃ < CH₃CH(CH₃)CH₂CH₃ < CH₃CH₂CH₂CH₂CH₃
CH₃CH(CH₃)CH₂CH₃ < CH₃C(CH₃)₃ < CH₃CH₂CH₂CH₂CH₃
CH₃CH₂CH₂CH₂CH₃ < CH₃CH(CH₃)CH₂CH₃ < CH₃C(CH₃)₃
16
What is the product when (CH
3
)
2
CH(OH) and acidified potassium permanganate, H
+
/KMnO
4
(aq), are heated together?
CH2CH2CHO
(CH3)2CH(OH)
(CH3)2CO
CH3CH2COOH
17
Chemistry is...
A scam
A scam
An empirical science
A scam
18
Which mixture forms a buffer soltuion with pH < 7?
50cm3 NH4Cl(aq) 0,10mol dm–3 + 50 cm3 NH3(aq) 0,10moldm–3
50cm3 NaOH(aq) 0,10moldm–3 + 100 cm3 CH3COOH(aq) 0,10moldm–3
50cm3 H2SO4(aq) 0,10moldm–3 + 100 cm3 NH3(aq) 0,10moldm–3
50cm3 HCl(aq) 0,10moldm–3 + 100 cm3 NH3(aq) 0,10moldm
19
What products are formed during the electrolysis of molten sodium chloride?
Hydrogen (cathode) and Chlorine (anode)
Sodium (cathode) and Chloride (anode)
Sodium (cathode) and Chlorine (anode)
Chlorine (cathode) and Sodium (anode)
20
Which combination has the most endothermic lattice enthalpy?
D
A
B
C
21
A redox reaction is a reaction in which there is an exchange of electrons. Which of the following statements is correct?
Th melting popin of NH3 is higher than that of PH3
At low pressures a gas does not behave like an ideal gas
An ionic bond is formed by sharing electrons between two atoms.
Thompson's atomic model included neutrons
22
What is the best description of ionic bonding?
Force between adjacent atomic nuclei without electrons
Electrostatic attraction between oppositely charged ions
Attraction between cations and free mobile electrons
Electrostatic attraction between the nuclei of two ions
23
Which of these factors explains why NiCl₄²⁻ y CoCl₄²⁻ have different colours?
Metallic ion identity
Complex ligand identity
Metallic ion charge
Spectrochemical series
24
Whose theory states that acids release protons and bases release OH-?
Carlos Fois García
Arrhenius
Bronsted-Lowry
Lavoisier
25
Which of the following are most likely to be in the right orientation for a reaction to occur?
Cl• + CH3•
Cl• + Cl•
HCl + CH2=CH2
CF3Cl + O3
26
How many atoms of oxygen are there in 0,0500mol of Ba(OH)
2
•8H2O?
3.01·1024
3.01·10-23
3.01·1023
10 moles
27
¿How many lone and bonding pairs of electrons surround the central chlorine atom in the ClF
2
+
ion?
2 and 2
1 and 1
0 and 2
2 and 4
28
What is heterolytic fission?
Rupture in which two radicals are formed
Breakup in which an atom takes both electrons
Breakdown in which a cation and an electron are formed
Breakdown that only occurs in UV light, generating an anion and a cation.
29
Otra vez no me entra la pregunta😢
-\frac{500\times4,18\times3,0\times46}{0,46}
-\frac{500\times4,18\times\left(3,0+273\right)\times46}{0,46}
\frac{500\times4,18\times3,0\times46}{0,46}
-\frac{500\times4,18\times3,0\times0,46}{46}
30
What is the name of this laboratory instrument?
Volumetric flask
Ball flask
Erlenmeyer flask
Round bottom flask
