What is a chemical element? Elements are the most basic chemical units. They are the building blocks of chemical substances Click here for the answer and to move to the next slide

In the periodic table below, what does each box containing a symbol represent? An element Click here for the answer and to move to the next slide

A = atomic number B = atomic mass Each element is represented by a symbol, Ne is neon. Identify the atomic number and the atomic mass on the diagram below A = atomic number B = atomic mass Click here for the answer and to move to the next slide

What type of elements are found on the right-hand side of the “staircase”? Click here for the answer and to move to the next slide Non-metals

What type of elements are found on the left-hand side of the “staircase”? Click here for the answer and to move to the next slide metals

State a property of a metal element Metal elements conduct Or All metal elements are solid at room temperature (except mercury) Click here for the answer and to move to the next slide

State a property of a non-metal element Non-metal elements do not conduct (except graphite) Or Almost all non-metal elements are gases at room temperature Click here for the answer and to move to the next slide

What are the columns in the periodic table called? Groups Click here for the answer and to move to the next slide

Why are elements placed in groups? They have similar chemical properties

Elements react with other elements to form new substance called compounds. Name the following compounds Elements joined together A = hydrogen and fluorine B= magnesium and oxygen C= hydrogen and chlorine D= sodium and oxygen A = hydrogen fluoride B= magnesium oxide C= hydrogen chloride D= sodium oxide Click here for the answer and to move to the next slide

State the chemical formula for the following compounds 1 = hydrogen fluoride 2= magnesium oxide 3= hydrogen chloride 4= sodium oxide 1 = HF 2= MgO 3= HCl 4= NaCl Click here for the answer and to move to the next slide

Name the two chemical compounds shown below CO2 Carbon dioxide C0 Carbon monoxide Click here for the answer and to move to the next slide

A mixture of elements and compounds not joined together What is a mixture A mixture of elements and compounds not joined together Click here for the answer and to move to the next slide

magnesium + oxygen magnesium oxide Write the word equation when magnesium reacts with oxygen to form magnesium oxide magnesium + oxygen magnesium oxide Click here for the answer and to move to the next slide

Which of the following is a chemical reaction? A gas explosion Breaking glass Petrol burning in a car engine Water boiling in a beaker Milk being produced in a cow Burning paper A gas explosion Petrol burning in a car engine Milk being produced in a cow Burning paper Click here for the answer and to move to the next slide

State a sign of a chemical reaction Change in appearance or Precipitate is formed (solid) a gas given off energy released or taken in Click here for the answer and to move to the next slide

The speed of a chemical reaction is called the rate of the reaction The speed of a chemical reaction is called the rate of the reaction. For each of the pictures shown below, state if the rate is slow or fast or very fast. X W Y W Rusting - slow X Baking - fast Y Explosion – very fast Click here for the answer and to move to the next slide

Temperature or Concentration Adding a catalyst He rate of a reaction can be changed if the particle size is altered. Name one other factor that could change the rate of a reaction. Temperature or Concentration Adding a catalyst Click here for the answer and to move to the next slide

Which two of the following would make the reaction go faster? Decreasing the particle size Or Increasing the concentration decreasing the temperature Adding a catalyst Increasing the concentration Adding a catalyst Click here for the answer and to move to the next slide

All solutions can be classified as being acid, alkali or neutral All solutions can be classified as being acid, alkali or neutral. Identify X and Y on the pH scale below X = acid Y = alkali Click here for the answer and to move to the next slide

What causes acid rain to form? When sulphur dioxide gas reacts with moisture in the air. Click here for the answer and to move to the next slide

Name the type of reaction taking place below. Neutralisation Click here for the answer and to move to the next slide

Complete the word equation for a neutralisation reaction acid + …………… salt + ……………… acid + alkali salt + water Click here for the answer and to move to the next slide

Why is lime added to a lake poisoned by acid rain? The lime neutralises the acid Click here for the answer and to move to the next slide

Which substance would you use to treat a bee sting? Baking soda (a bee sting is acidic and the baking soda is alkaline) Click here for the answer and to move to the next slide

Is a nettle sting acidic or alkaline? Click here for the answer and to move to the next slide