Chemistry Standard Level Paper 1A Specimen

<p>Copper(II) ions absorb red light and transmit blue light. (D)</p> Signup and view all the answers

<p>H2C=C(CH3)2 (C)</p> Signup and view all the answers

<p>Metals have delocalized electrons that can move freely. (A)</p> Signup and view all the answers

<p>CH3COCH3 (A)</p> Signup and view all the answers

<p>Mn (B)</p> Signup and view all the answers

<p>-1368 kJ (B)</p> Signup and view all the answers

<p>C2H4(g) + H2O(g) -&gt; C2H5OH(g) (C)</p> Signup and view all the answers

<p>94.5% (D)</p> Signup and view all the answers

<p>Reactant (A)</p> Signup and view all the answers

<p>Decreases by 1 (C)</p> Signup and view all the answers

<p>+1384 kJ (B)</p> Signup and view all the answers

<p>Addition (A)</p> Signup and view all the answers

<p>It is a sustainable development (C)</p> Signup and view all the answers

<p>All hydrogen atoms are equivalent. (C)</p> Signup and view all the answers

<p>Two (B)</p> Signup and view all the answers

<p>Ethane (C)</p> Signup and view all the answers

<p>Butanal (D)</p> Signup and view all the answers

<p>86 (A)</p> Signup and view all the answers

<p>All of the above. (D)</p> Signup and view all the answers

<p>Loss of an aldehyde group. (C)</p> Signup and view all the answers

<p>Mass spectrometry (C)</p> Signup and view all the answers

<p>The isotope 2H has a higher density than ordinary water. (B)</p> Signup and view all the answers

<p>+3 (B)</p> Signup and view all the answers

<p>1:2 (B)</p> Signup and view all the answers

<p>15 kPa (C)</p> Signup and view all the answers

<p>Mg(HCO3)2 (B)</p> Signup and view all the answers

<p>CH3COO-, NO2-, C(graphite) (B)</p> Signup and view all the answers

<p>Octahedral (D)</p> Signup and view all the answers

<p>N=N-O (C)</p> Signup and view all the answers

<p>A larger proportion of collisions have sufficient energy to overcome the activation energy. (A)</p> Signup and view all the answers

<p>[SO2]^2 [O2] / [SO3]^2 (D)</p> Signup and view all the answers

<p>X is a transition state and Y is an intermediate. (A)</p> Signup and view all the answers

<p>4 (A)</p> Signup and view all the answers

<p>H2 + C2H4 → C2H6 (C)</p> Signup and view all the answers

<p>2HCl (aq) + CaCO3 (s) → CaCl2 (aq) + H2O (l) + CO2 (g) (C), 2HCl (aq) + MgO (s) → MgCl2 (aq) + H2O (l) (D)</p> Signup and view all the answers

<p>2HCl (aq) + Mg (s) → MgCl2 (aq) + H2 (g) (A), 2HCl (aq) + Zn (s) → ZnCl2 (aq) + H2 (g) (C)</p> Signup and view all the answers

<p>The temperature. (C)</p> Signup and view all the answers

<p>The C–F bond is stronger than the C–Cl bond. (D)</p> Signup and view all the answers

<p>A halogen molecule. (B)</p> Signup and view all the answers

<p>Its ability to accept a lone pair of electrons. (A)</p> Signup and view all the answers

<p>Iodide ion is more stable as a free ion. (B)</p> Signup and view all the answers

<p>Water acts as a nucleophile, attacking the carbon bonded to chlorine. (B)</p> Signup and view all the answers

<p>The reaction involves a carbocation intermediate, formed by the loss of chloride ion. (A)</p> Signup and view all the answers

<p>A sigma complex with the NO2 group directly attached to the benzene ring. (C)</p> Signup and view all the answers

<p>Ammonia is a strong base and can readily donate a lone pair of electrons. (B)</p> Signup and view all the answers

All heat is transferred to pure water with a density of 1 g cm-3.

CO2 consumed during plant growth is released when biofuel is combusted.

The process where plants use CO2, which is later released upon biofuel combustion.

ΔHϴ is determined by bond energies: 4(C ̶ C) broken and 2(C=C) formed.

Process completing combustion that involves products such as CO2 and H2O.

The percentage of theoretical yield achieved in a reaction, calculated as (actual/theoretical) × 100.

Using resources efficiently, better practices to reduce waste and support future generations.

C2H4(g) + H2O(g) → C2H5OH(g) represents the formation of ethanol.

Ice with 2H sinks in normal water due to density differences.

Ionization energy increases as electrons are removed from an atom.

Use masses and molar masses to find the ratio of atoms in a mixture.

Pressure varies directly with temperature in a fixed volume for an ideal gas.

The compound formed is Mg(HCO3)2, indicating a balance of charges.

Electrons that are spread out across more than two atoms.

The molecular geometry around the central atom is square planar.

The best Lewis structure minimizes formal charges across the molecule.

Molecules that have no polar bonds and are balanced in structure.

The process by which symmetrical molecules absorb infrared radiation.

A diagram used to analyze the hydrogen atoms in a molecule.

A scale in NMR spectroscopy indicating the environment of hydrogen atoms.

A graph displaying the masses of different ions present in a sample.

The measurement of abundance of ions in mass spectrometry, usually expressed in percentages.

The mass-to-charge ratio used in mass spectrometry to identify ions.

An organic compound with the formula C4H8O, commonly analyzed by mass spectrometry.

Malleability refers to the ability of metals to be shaped without breaking due to the presence of free-moving electrons.

A monomer is a small molecule that can join together to form polymers, such as plastics.

Copper(II) sulfate appears blue because it absorbs red light when electrons are promoted.

A carbonyl group is characterized by a carbon atom double-bonded to an oxygen atom and is present in compounds like ketones and aldehydes.

The periodic table is organized by atomic number, grouping elements with similar properties.

D block elements can exhibit multiple oxidation states, reflecting their versatility in bonding.

Greenhouse gases trap heat in the atmosphere, contributing to the greenhouse effect.

Pi bonds are covalent bonds formed by the sideways overlap of p orbitals, typically found in double and triple bonds.

The bond strength of carbon to chlorine is stronger than carbon to fluorine.

The bond strength of carbon to fluorine is weaker than carbon to chlorine.

Ammonia (NH3) cannot be characterized as a Lewis acid.

In nucleophilic substitutions, iodide ion is the best leaving group.

In the reaction with 2-chloro-2-methylpentane, water acts as a nucleophile.

In certain reactions, a carbocation intermediate is formed after nucleophile attack.

Benzene reacts with NO2+ to form a nitrobenzene intermediate.

Radicals can reform chlorine molecules during chain termination steps.

Increasing temperature leads to a greater proportion of successful collisions between particles.

For the reaction 2SO3 (g) ⇌ 2SO2 (g) + O2 (g), the expression is [SO2]²[O2]/[SO3]².

In an energy profile, X usually represents a transition state while Y represents products.

For A (g) + 2B (g) ⇌ 2C (g) at equilibrium with concentrations 2, 1, 2, the K value is 2.

The largest Arrhenius factor is seen in simpler reactions, like H (g) + I (g) → HI (g).

Identifying reactions transferring protons involves analyzing equations like 2HCl (aq) + Mg (s).

An equilibrium state occurs when the rates of the forward and reverse reactions are equal.

In a reaction coordinate diagram, the 'reaction coordinate' shows the progress of a reaction.