French Baccalaureat · Physique-Chimie

Chimie et transformations de la matière

21 practice questions, each with the answer and an explanation.

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What amount of substance is $36 g$ of water ( $M = 18 g/mol$ )?
A solution contains $0.5 mol$ of solute in $250 mL$ . What is its molar concentration?
What is the pH of a $0.01 mol/L$ solution of hydrochloric acid, a strong acid?
In a redox reaction, what does oxidation correspond to?
Methane burns according to $CH_{4} + 2 O_{2} \to CO_{2} + 2 H_{2} O$ . How many moles of $O_{2}$ react with $3 mol$ of $CH_{4}$ ?
For $2 H_{2} + O_{2} \to 2 H_{2} O$ , a mixture contains $3 mol$ of $H_{2}$ and $1 mol$ of $O_{2}$ . How many moles of water form at most?
A volume of $100 mL$ of a $1 mol/L$ solution is diluted to a final volume of $500 mL$ . What is the new concentration?
What does a catalyst do in a chemical reaction?
What is true of an exothermic reaction?
A volume of $20.0 mL$ of $0.10 mol/L$ HCl is neutralised by a $0.20 mol/L$ NaOH solution ( $1 : 1$ reaction). What volume of NaOH is needed?
What do isotopes of an element have in common?
What is the formula of ethene, the simplest alkene, and what feature identifies an alkene?
What are the products of the esterification of a carboxylic acid with an alcohol?
For the equilibrium $A + B ⇌ C$ , which expression is the equilibrium constant $K$ ?
According to Le Châtelier's principle, what happens when more reactant is added to a system at equilibrium?
What is electrolysis?
A radioactive sample has a half-life of $8$ days. What fraction of the nuclei remains after $24$ days?
How much energy is needed to heat $500 g$ of water by $20 K$ ? The specific heat capacity of water is $4.18 J\cdotg^{- 1} \cdotK^{- 1}$ .
A fixed amount of an ideal gas is heated at constant volume so that its absolute temperature doubles. What happens to the pressure?
What is the conjugate base of the ammonium ion $NH_{4}^{+}$ ?
In the reaction $Zn + Cu^{2 +} \to Zn^{2 +} + Cu$ , which statement is correct?

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Chimie et transformations de la matière

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