What is the melting point of ice, and what does it signify?

True or False: Boiling is the process where only surface particles of a liquid gain energy to become gas.

False. Boiling occurs when all particles in a liquid have enough energy to change into gas.

Fill in the blank: Different substances have different ___ points, which help to distinguish one substance from another.

Melting

I am a process that can happen at any temperature, transforming liquids into gases. What am I?

Evaporation

What are the materials called that transfer heat effectively?

Thermal conductors.

Fill in the blank: Metals are generally considered good conductors of heat, with ___ being the best conductor.

Silver

True or False: Non-metals like glass and plastic are excellent conductors of electricity.

False. Non-metals are generally poor conductors of electricity.

I can conduct electricity and heat, yet I am solid and shiny. What am I?

A metal

What is the process called when solid ice transforms into liquid water, and why is it classified as a physical change?

Fill in the blank: The substance that dissolves in a liquid is called the ___, while the liquid in which it dissolves is called the ___.

Solute; solvent

True or False: When a match burns, it undergoes a reversible change.

Riddle: I can change my form from solid to liquid and back again without altering my identity. What am I?

Water

What is the primary reason that a solute becomes invisible in a solution after dissolving?

Fill in the blank: Stirring increases the rate at which a solute, like ___, dissolves in a solvent.

Sugar

True or False: Heating a solvent decreases the movement of solute particles, making them dissolve slower.

False

The Effect of Heating on Solubility

• Heating a solvent increases the kinetic energy of its molecules, leading to faster movement of solute particles.

• Increased movement enhances collisions between solute and solvent molecules, promoting quicker dissolution.

• This principle is crucial in various applications, including cooking and chemical processes, where solubility is key.

Riddle: I help you sweeten your drink, and when placed in hot liquid, I disappear without a trace. What am I?

Sugar

What are the substances that undergo a change in a chemical reaction called?

Reactants

___ are formed as a result of a chemical reaction.

Products

True or False: The production of a gas, such as when vinegar and bicarbonate of soda react, is evidence of a chemical reaction.

True

I am mixed to create something new, my transformation is what you pursue. What am I?

A chemical reactant