C7 Ocr Revision Quiz

Hydrocarbons are organic compounds made up of carbon and hydrogen atoms. They do not contain other elements such as oxygen, nitrogen, sulfur, phosphorus, iron, or silver.

Alkanes are hydrocarbons where carbon atoms are joined by single bonds, while alkenes have carbon-carbon double bonds, alkynes have carbon-carbon triple bonds, and aromatic hydrocarbons have special resonance structures.

In an alkane, all the carbon-carbon bonds are single bonds, meaning that each carbon atom is bonded to the maximum number of hydrogen atoms possible. This results in the alkane being 'saturated' with hydrogen atoms, hence the term saturated.

The correct answer is methane. Methane is a chemical compound with the chemical formula CH4. It is the simplest alkane and the main component of natural gas. The structure provided in the question matches the structure of methane.

The structural formula of ethane consists of two carbon atoms connected by a single bond with each carbon atom also bonded to three hydrogen atoms. Therefore, the correct answer is H H | |H - C - C - H | | H H. The incorrect options depict structures of different molecules or incorrect bond types.

Alkanes are generally considered to be inert towards aqueous reagents due to their nonpolar nature and lack of functional groups that can participate in reactions with water.

To balance the equation, the number of each type of atom on both sides of the equation must be equal. In this case, the correct balanced equation is CH4 + 2O2 --> CO2 + 2H2O, where there are 1 Carbon atom, 4 Hydrogen atoms, and 4 Oxygen atoms on both sides.

Alcohols are a homologous series characterized by the -OH functional group, which gives them their unique chemical properties.

The correct structural formulas for methanol and ethanol are CH3OH and C2H5OH respectively.

Ethanol is a versatile compound that can be used in various industries and applications.

Methanol is commonly used in several industries for various purposes such as fuels, adhesives, foams, cosmetics and solvents.

Hydrocarbon chains are less dense than water because they are nonpolar molecules and do not mix with water, leading to a lower overall density compared to water.

Alcohols when burned in air undergo combustion reactions to produce carbon dioxide and water due to the combination of the alcohol with oxygen in the air.

The correct balanced equation showcases the reaction of ethanol (C2H5OH) with oxygen (O2) resulting in the formation of water (H2O) and carbon dioxide (CO2). The coefficients represent the stoichiometry of the reaction to ensure mass conservation.

When alcohols react with sodium, a chemical reaction takes place producing a salt and hydrogen gas. This is due to the displacement reaction where sodium replaces the hydrogen in alcohols to form a salt, while hydrogen gas is released as a byproduct.

In the reaction between ethanol (C2H5OH) and sodium (Na), the correct symbol equation is C2H5OH + Na --> C2H5ONa + H2. The incorrect answers provided do not represent the actual products formed in this specific chemical reaction.

Sodium has unique reactions with different substances, leading to various outcomes depending on its environment. It is important to understand these reactions for safety and scientific purposes.

Carboxylic acids are organic compounds that contain the functional group -COOH. The series they form is a homologous series, where each member differs by a constant increment of -CH2-.

Methanoic acid has one carbon atom and one oxygen atom, while ethanoic acid has two carbon atoms, four hydrogen atoms, and two oxygen atoms. Their chemical structures can be distinguished by the arrangement of atoms and molecular formula.

Carboxylic acids contribute to the development of rancid taste in butter and the sweaty odor in training shoes due to their chemical properties.

Acids can be neutralized by reacting with metals, alkalies, and carbonates to produce carboxylic acid salts. The incorrect answers provided do not accurately describe the process of neutralizing acids and the resulting products.

In the reaction between ethanoic acid and sodium, the hydrogen from the acid combines with the sodium to form hydrogen gas, leaving behind sodium ethanoate.

The correct word equation for the reaction between ethanoic acid and sodium hydroxide involves the formation of sodium ethanoate and water. The other options include incorrect chemical formulas or product names that do not match the reaction.

The correct word equation for the reaction between ethanoic acid and sodium carbonate involves the formation of sodium ethanoate, water, and carbon dioxide. The other options present incorrect products or different reactants altogether.

Fats are esters formed from the combination of glycerol and fatty acids. The correct answer option provides the two components required to form fats.

Glycerol, also known as glycerin, has a total of three -OH groups, which contributes to its properties as a trihydric alcohol.

Animal fats are mostly saturated molecules, which means they have single carbon-carbon bonds and are unreactive. Double or triple carbon-carbon bonds would make the molecules unsaturated and more reactive. Hydrogen-carbon bonds are not specific to carbon-carbon bonds in fats.

Unsaturated fats have double carbon-carbon bonds (C=C) instead of single carbon-carbon bonds (C-C), which makes them liquid at room temperature.

When carboxylic acids react with alcohols, they form esters through a process known as esterification. This reaction involves the combination of a carboxylic acid and an alcohol in the presence of an acid catalyst, resulting in the formation of an ester and water.