Chemistry Quiz 4 6th Graders

When a substance dissolves in a liquid, it forms a solution. A solution is a homogeneous mixture where the solute (substance being dissolved) is evenly distributed and dispersed in the solvent (liquid). This process occurs at a molecular level, where the solute particles are surrounded by solvent particles and become uniformly dispersed throughout the liquid. Therefore, the correct answer is "solution."

Water turns into ice at 0 degrees Celsius. This is because at this temperature, water molecules slow down and come closer together, forming a solid crystal lattice structure. Below 0 degrees Celsius, water molecules lose enough energy to freeze and become ice. Therefore, 0 degrees Celsius is the freezing point of water and the temperature at which it turns into ice.

When water is heated in a kettle, it starts to boil and convert into steam. As the water boils, it releases steam which increases the pressure inside the kettle. This increased pressure pushes against the lid of the kettle, causing it to rise and let out the steam. Therefore, the correct answer is pressure.

Condensation is the reverse of evaporation because it involves the conversion of a gas or vapor into a liquid. During condensation, the molecules in a gas or vapor lose energy and come together to form a liquid. This process is the opposite of evaporation, where a liquid turns into a gas or vapor by gaining energy and breaking apart its molecules.

When a pinch of salt is poured on the surface of cubic ice, it causes the ice to melt. This is because salt lowers the freezing point of water. When salt is added to ice, it disrupts the ice crystals and prevents them from forming a solid structure. As a result, the ice starts to melt and turns into liquid water.

Water is a liquid at room temperature and pressure, and it can exist in the form of a gas when heated. Ice, on the other hand, is the solid form of water, which occurs at temperatures below 0 degrees Celsius. Therefore, the correct answer is A) liquid, gas, chemical. The options B) solvent, solid, solution are incorrect as they do not accurately describe the physical states of water and ice.