Dalton's Atomic Model
John Dalton's atomic theory said that all matter was made up from what?
Tiny particles called atoms
What always happens during a chemical reaction?
New substances/products are formed
Why did Mendeleev leave gaps in his periodic table?
For undiscovered / unknown elements.
What are most elements in the periodic table, metal or non-metal?
Metal
What is formed when magnesium is heated and reacts with oxygen gas?
Magnesium oxide
Which of these diagrams shows the particles in a compound?
C
Give two ways we can tell that a chemical reaction has occurred.
How did Mendeleev order the elements in his periodic table?
Where are most non-metals found in the periodic table?
Right hand side (of the stepped line).
What is the name of group 7 elements?
Halogens
What is the correct symbol for iron?
Fe
Which of the following is a chemical change?
A
Which two elements in the periodic table shown would have the most similar chemical properties?
1 and 6
Which of the following substances will be a liquid at 350 °C?
C
What happens to the reactivity of the Alkali metals as you go down the group?
Reactivity increases as you go down the group.
When magnesium ribbon reacts with steam a solid called magnesium oxide and hydrogen gas are formed.
What is the word equation for this reaction?
magnesium + water ==> magnesium oxide + hydrogen
Which of the following could have the formula XY2?
B
Give an example of an element that is very unreactive?
Helium, Neon, Argon, Krypton, Xenon etc
Some information about group 0 elements is shown in the image..
Describe the trend in density of group 0 elements
Increases down the group.
Describe what you would see if sodium was dropped into a tank of water.
Fizzing, moving around the surface, the metal melts into a ball, disappears.
Define the meaning of the word 'compound'.
A compound is always made up of two or more different types of atom chemically joined together.
Iron reacts with sulfur to make iron sulfide.
Describe how iron sulfide is different from its elements in terms of properties.
Iron sulfide is not magnetic like iron
Give a propertiy of the Group 1 elements that is NOT typical of a metal.
Soft so can be cut with a knife; low density so will float; low melting and boiling points
List three typical properties of non-metals.
Low melting/boiling points
Brittle
Dull
Poor conductors of heat
Poor conductors of electricity
Low density / soft
Sodium reacts with water to form what two products?
Sodium hydroxide and hydrogen