Question 1

The systematic name for SiO2 is silicon __oxide

Accepted Answer

Question 2

What is the oxidation state of C in Li2CO3?

Accepted Answer

A)  +1. 
B)  +2. 
C)  +3. 
D)  +4. 
A)  +1. 
B)  +2. 
C)  +3. 
D)  +4.

Question 3

The derived SI unit for pressure is Pa (pascals). What is this in base SI units given that pressure = force/area?

Accepted Answer

A)  atm. 
B)  Kg m-1 s-2. 
C)  bar. 
D)  g mm-1 s-2. 
A)  atm. 
B)  Kg m-1 s-2. 
C)  bar. 
D)  g mm-1 s-2.

Question 4

An exothermic reaction has a ________ enthalpy change.

Accepted Answer

The answer of An exothermic reaction has a ________ enthalpy...

Question 5

An organic compound is found to contain by mass, 76.57% carbon, 6.43% hydrogen and 17% oxygen and a relative molecular mass (Mr) of 94.12 g mol-1. The molecular formula of the compound is ______.

Accepted Answer

Question 6

Match the following brief description with the correct term:
-involves the transfer of a proton

Accepted Answer

A)  Acid-base reaction 
B)  Precipitation reaction 
C)  Redox reaction 
D)  Complexation reaction 
A)  Acid-base reaction 
B)  Precipitation reaction 
C)  Redox reaction 
D)  Complexation reaction

Question 7

In a titration, a standard solution of hydrochloric acid (concentration 0.2 mol dm-3) was added to 25 cm3 of a sodium hydroxide solution, concentration unknown. On addition of 18.5 cm3 HCl, the equivalence point was reached. What is the concentration of the sodium hydroxide solution?

Accepted Answer

A)  0.2 
B)  3.7 × 10-3. 
C)  0.296 
D)  0.148 
A)  0.2 
B)  3.7 × 10-3. 
C)  0.296 
D)  0.148

Question 8

An endothermic reaction is one in which the system releases energy and warms the surroundings.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following will the isotopes of an element have in common? Please select all that apply.

Accepted Answer

A)  The same number of protons. 
B)  The same number of neutrons. 
C)  A different number of electrons. 
D)  A different number of neutrons. 
A)  The same number of protons. 
B)  The same number of neutrons. 
C)  A different number of electrons. 
D)  A different number of neutrons.

Question 10

Match the non-covalent interaction with an example of a molecule pair that the non-covalent interaction acts between.
-Ion-dipole

Accepted Answer

A)  C2H6, C4H10 
B)  CHCl3, CH3OH 
C)  Na+ and H2O 
D)  CH3OH, H2O 
A)  C2H6, C4H10 
B)  CHCl3, CH3OH 
C)  Na+ and H2O 
D)  CH3OH, H2O

Question 11

Element X has the atomic symbol ${}_{18}^{40}X$ . How many neutrons are there in the nucleus?

Accepted Answer

A)  18. 
B)  36. 
C)  22. 
D)  40. 
A)  18. 
B)  36. 
C)  22. 
D)  40.

Question 12

Chemists commonly use the Kelvin (T / K) and Celsius (θ / °C) temperature scales. Match the values in Celsius to the equivalent value on the kelvin temperature scale.
-25 °C

Accepted Answer

A)  373.15 K 
B)  273.15 K 
C)  0 K 
D)  298 K 
A)  373.15 K 
B)  273.15 K 
C)  0 K 
D)  298 K

Question 13

The H-Cl bond length is 127.5 pm. Which of the following lengths is equivalent? Please select all that apply.

Accepted Answer

A)  1.275 × 10-12 m. 
B)  1.275 Å. 
C)  0.1275 nm. 
D)  1.275 × 10-10 mm. 
A)  1.275 × 10-12 m. 
B)  1.275 Å. 
C)  0.1275 nm. 
D)  1.275 × 10-10 mm.

Question 14

The empirical formula of a substance tells you the actual number of different elements in a molecule.

Accepted Answer

A) True 
 B)False

Question 15

The systematic name for XeF4 is xenon _____fluoride

Accepted Answer

Question 16

The combustion of glucose in oxygen at 298 K is given by the following thermochemical equation:
C6H12O6 (s) + 6O2 → 6CO2 (g) + 6H2O (l) $\Delta_{T} H_{298}^{\theta}$ = -2808 kJ mol-1. How much heat energy (in kJ) is supplied when 275 g of glucose burn in a plentiful supply of air so that combustion is complete?

Accepted Answer

A)  2808. 
B)  4286.19 
C)  772.20 
D)  772200. 
A)  2808. 
B)  4286.19 
C)  772.20 
D)  772200.

Question 17

A 150 cm3 solution containing Br- was treated with excess AgNO3 in order to find the Br- concentration in the solution. 0.873 g of AgBr was precipitated out. What was the concentration (in mol dm-3) of Br- in the unknown solution?

Accepted Answer

A)  4.65 × 10-3. 
B)  0.031 
C)  3.10 × 10-5. 
D)  0.073 
A)  4.65 × 10-3. 
B)  0.031 
C)  3.10 × 10-5. 
D)  0.073

Exam 1: Fundamentals

The systematic name for SiO2 is silicon __oxide

What is the oxidation state of C in Li2CO3?

The derived SI unit for pressure is Pa (pascals). What is this in base SI units given that pressure = force/area?

An exothermic reaction has a ________ enthalpy change.

An organic compound is found to contain by mass, 76.57% carbon, 6.43% hydrogen and 17% oxygen and a relative molecular mass (Mr) of 94.12 g mol-1. The molecular formula of the compound is ______.

Match the following brief description with the correct term: -involves the transfer of a proton

In a titration, a standard solution of hydrochloric acid (concentration 0.2 mol dm-3) was added to 25 cm3 of a sodium hydroxide solution, concentration unknown. On addition of 18.5 cm3 HCl, the equivalence point was reached. What is the concentration of the sodium hydroxide solution?

An endothermic reaction is one in which the system releases energy and warms the surroundings.

Which of the following will the isotopes of an element have in common? Please select all that apply.

Match the non-covalent interaction with an example of a molecule pair that the non-covalent interaction acts between. -Ion-dipole

Element X has the atomic symbol 1840X{}_{18}^{40}X1840​X . How many neutrons are there in the nucleus?

Chemists commonly use the Kelvin (T / K) and Celsius (θ / °C) temperature scales. Match the values in Celsius to the equivalent value on the kelvin temperature scale. -25 °C

The H-Cl bond length is 127.5 pm. Which of the following lengths is equivalent? Please select all that apply.

The empirical formula of a substance tells you the actual number of different elements in a molecule.

The systematic name for XeF4 is xenon _____fluoride

A 150 cm3 solution containing Br- was treated with excess AgNO3 in order to find the Br- concentration in the solution. 0.873 g of AgBr was precipitated out. What was the concentration (in mol dm-3) of Br- in the unknown solution?

The Language of Organic Chemistry

Atomic Structure and Properties

Diatomic Molecules

Polyatomic Molecules

Solids

Acids and Bases

Gases

Reaction Kinetics

Molecular Spectroscopy

Analytical Chemistry

Molecular Characterisation

Energy and Thermochemistry

Entropy and Gibbs Energy

Electrochemistry

Phase Equilibrium and Solutions

Isomerism and Stereochemistry

Organic Reaction Mechanisms

Halogenoalkanes: Substitution and Elimination Reactions

Alkenes and Alkynes: Electrophilic Addition and Pericyclic Reactions

Benzene and Other Aromatic Compounds: Electrophilic Substitution Reactions

Aldehydes and Ketones: Nucleophilic Addition and Α-Substitution Reactions

Carboxylic Acids and Derivatives: Nucleophilic Acyl Substitution and Α-Substitution Reactions

Hydrogen

S-Block Chemistry

P-Block Chemistry

D-Block Chemistry

Filters

The systematic name for SiO₂ is silicon __oxide

What is the oxidation state of C in Li₂CO₃?

An organic compound is found to contain by mass, 76.57% carbon, 6.43% hydrogen and 17% oxygen and a relative molecular mass (M_r) of 94.12 g mol^-1. The molecular formula of the compound is ______.

In a titration, a standard solution of hydrochloric acid (concentration 0.2 mol dm^-3) was added to 25 cm³ of a sodium hydroxide solution, concentration unknown. On addition of 18.5 cm³ HCl, the equivalence point was reached. What is the concentration of the sodium hydroxide solution?

Element X has the atomic symbol ${}_{18}^{40}X$ . How many neutrons are there in the nucleus?

The systematic name for XeF₄ is xenon _____fluoride

A 150 cm³ solution containing Br^- was treated with excess AgNO₃ in order to find the Br^- concentration in the solution. 0.873 g of AgBr was precipitated out. What was the concentration (in mol dm^-3) of Br^- in the unknown solution?