Endothermic reactionsKeywords (English): endothermic reactions – energy absorption – thermal change

the goal:Measuring the change in temperature of a mass of water during a combustion reaction.Materials and tools:Candle - Small metal box - Large open-ended metal box - Steel wool - Balance - Pen - Stirring rod - ThermometerSteps:1. Light the candle and weigh the large container.2. Fill the containe......

Keywords: Solubility product – Sparingly soluble salts – Equilibrium – Solutions – Comparison

Keywords: Equilibrium – Equal forces – Rest – Uniform motion

Keywords: Calories – Food – Energy – Combustion – Heat

Keywords: Specific heat – Thermal energy – Mass – Temperature

Keywords: Cold materials – Heat transfer – Absorption – Temperature

This experiment demonstrates the effect of concentration and temperature on the equilibrium between the pink and blue cobalt chloride complexes.Keywords: Equilibrium – Forces – Motion – Position – Physics

Objective: To identify the difference between exothermic and endothermic reactions. Materials: Glass beaker, teaspoon, thermometer, water, magnesium oxide (MgO), sulfuric acid (H₂SO₄), baking soda (NaHCO₃), vinegar (CH₃COOH).Procedure:Place a small amount of magnesium oxide in a glass beaker.Add an......

Objective: To distinguish between reversible and irreversible reactions.Materials: Candle – white paper – egg – ice cubes – sugar – butter – heat source – heat-resistant container – tongs.Procedure: Observe each material before heating. Heat each material gradually and record the changes. Cool each......

Objective: To prove that some chemical reactions are accompanied by the release of thermal energy, which leads to an increase in the temperature of the surrounding medium.Materials: Dilute hydrochloric acid – Magnesium ribbon – Sodium hydroxide solution – Sodium carbonate – Polystyrene cups – Glass......

Objective: To identify chemical reactions that absorb thermal energy from the surroundings, leading to a decrease in temperature.Tools: Barium hydroxide - Ammonium chloride - Sodium bicarbonate - Dilute acid - Calcium carbonate - Glass flask - Insulated cup - Thermometer - Heat sourceSteps: Barium h......

the goal:Explanation of thermal energy transformations.Materials and tools:Magnesium sulfate - Calcium chloride - Distilled water - Glass beaker - Thermometer - Scale - Glass pipette - Spoon.Steps:1- Fill the glass beaker with 100 ml of water and record the temperature using the thermometer.2- Weigh......

Objective: To determine the water content in popcorn kernels by measuring mass before and after heating.Materials: Glass beaker _ 20 popcorn kernels _ 5 mL cooking oil _ aluminum foil _ electronic balance _ stove or hot plateProcedure: Add 5 mL of cooking oil to a clean glass beaker. Measure the mas......

Objective:To identify the neutralization reaction between an acid and an alkali using a universal indicatorMaterials:Test tubes – Dropper – Dilute sodium hydroxide solution NaOH – Dilute hydrochloric acid HCl – Universal indicatorProcedure:Place 1 mL of dilute sodium hydroxide solution into a test t......

This experiment aims to study the reaction of a strong acid with a salt of a weak acid and identify the products formed.