What is a chemical reaction and how do you know it is taking place?

• A chemical reaction is when chemicals bond toghether, and it is rearranging atoms. We know it is taking place due to a number of factors, such as bubbles fizzing, change in colour,

What is a physical reaction and how do you know it's taking place?Define physical reaction.How do you know a physical reaction is happening?

• A physical reaction is a change in state, and we know it is taking place when the chemical has a change in state, eg solid to liquid, liquid to gas

When comparing reactants and products, what do you notice?What do you notice when comparing reactants and products?

• When comparing reactants to products, we notice that no number of atoms or energy are lost in the equation. This means it is a balanced equation

State the four state symbols.How many state symbols are there?

• a=aqueas, l=liquid, go=gas, s=solid

What is an endothermic reaction and give some examples?Define endothermic reaction and provide examples.-

• An endothermic reaction is when the energy from the environment gets transported into the material or chemical, making it feel cool to touch.

What is an exothermic reaction and give some examples?Define exothermic reaction and provide examples.-

State the law of conservation of Energy-What is the law of conservation of Energy?

• The law of the conservation of energy States that no energy is lost during a chemical change.

What does a catalyst mean?Define catalyst.-

• A catalyst is a chemical that speeds up the process of chemical reactions

Explain different types of catalysts.-

• motors

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Define a chemical reaction.→Process that transforms substances into new substances

How do you know a chemical reaction is happening?→Observing changes in properties or energy release

Define physical reaction.→Process that changes form, not substance

How do you know a physical reaction is happening?→Change in form, not substance

What do you notice when comparing reactants and products?→Differences

How many state symbols are there?→Four

Define endothermic reaction and provide examples.→Absorbs heat, e.g., melting ice

Define exothermic reaction and provide examples.→Release heat, e.g., combustion

What is the law of conservation of Energy?→Energy cannot be created or destroyed

Define catalyst.→Speeds up chemical reactions