Look at the picture below. This group contains an element with the symbol Na. What is this element's name?
Look at the picture below. This group contains an element with the symbol Na. What is this element's name?
What are all substances made of?
A substance made of only one type of atom is known as an
All matter is made up of what? (Hint - the word begins with the letter 'a').
True or false? Atoms are too small to see with the naked human eye.
What is the name for a substance containing only one type of atom?
Which of the following is not an element?
Dalton stated that all matter is made of atoms which are
Look at the picture below. This group contains an element with the symbol Na. What is this element's name?
Which element has the symbol He?
Which element has the symbol Ca?
Is N the correct symbol for nitrogen?
Which element has the symbol Mg?
Which element has the symbol Cu?
True or false? All chemical symbols start with the first letter of the element name.
True or false? Tin has the symbol Ti.
Is S the correct symbol for sulfur?
Is Si the correct symbol for silver?
True or false? Aluminium has the symbol A.
Which element has the symbol Pb?
What does the chemical symbol Cl stand for?
Which element is represented by the symbol Fe?
In what table are all the elements shown?
Approximately how many elements are there?
Dalton stated that all atoms of a given element have properties.
Dalton stated that compounds are combinations of two or more different types of
Two elements are found together in a substance. They are not chemically combined. Is this substance an element, a mixture or a compound?
What word describes different compounds which are found together but not combined chemically?
A container holds an element and a compound that are not chemically combined. Is this an element, a mixture or a compound?
How many types of atom are contained in an element?
Look at the table. What word goes in the question mark to complete the table?
Look at the table. What word goes in the question mark to complete the table?
The diagram shows the displayed formula of a substance. Is this an element, a compound or a mixture?
Which of the samples shown contains a mixture?
Which of these substances contains a compound made up of exactly 2 different types of atom?
Which of these substances contains a compound made up of 3 different types of atom?
Which 2 substances show pure elements?
Which of these substances is pure nitrogen (N2)?
Which of these substances is carbon monoxide (CO)?
Which of these substances is carbon dioxide (CO2)?
How many atoms are represented by the symbol Na?
What is the element with the symbol Zn?
What is the full name of the compound MgO?
What element is represented by the O in MgO?
What is the full name of the compound CuSO4?
The diagram shows the displayed formula of a substance. Name one of the elements in this substance.
The diagram shows the displayed formula of a substance. How many different elements are there in this substance?
What is the formula for sodium chloride?
True or false? CuSO4 contains four sodium atoms.
True or false? No atoms are gained or lost in a chemical reaction.
Complete the following sentence. The nucleon number is equal to the number of neutrons an atom has added to the number of
In an atom, the number of protons is always equal to the number of... what?
What is the atomic number of a hydrogen atom?
Give the formula for carbon monoxide.
The diagram shows the displayed formula of a substance. How many atoms of carbon are there in this substance?
When calcium carbonate is heated, it decomposes to form calcium oxide and carbon dioxide:
calcium carbonate → calcium oxide + carbon dioxide
CaCO3 → CaO + CO2
Calcium oxide reacts with water to form calcium hydroxide, also called slaked lime:
calcium oxide + water → calcium hydroxide
CaO + H2 → Ca(OH)2
In this reaction, the total mass of calcium in the reactants is 40. What is the total mass of calcium in the products?
When calcium carbonate is heated, it decomposes to form calcium oxide and carbon dioxide:
calcium carbonate → calcium oxide + carbon dioxide
CaCO3 → CaO + CO2
Calcium oxide reacts with water to form calcium hydroxide, also called slaked lime:
calcium oxide + water → calcium hydroxide
CaO + H2 → Ca(OH)2
If the total mass of the reactants in the second reaction is 74, what will the total mass of the products (calcium hydroxide) be?
The total mass of the reactants is equal to the total mass of products. This is known as the conservation of what?
12 g of magnesium ribbon was heated in a crucible. At the end of the reaction 20 g of magnesium oxide had been produced. What mass of oxygen had reacted with the magnesium?
When 24 g of magnesium metal is heated in air, 40 g of magnesium oxide is produced. What mass of magnesium would be needed in order to produce 10 g of magnesium oxide?
100 g of calcium carbonate was heated until it decomposed to give calcium oxide and carbon dioxide. 56 g of calcium oxide was left. Work out the mass of carbon dioxide given off.
True or false? Mass is always conserved in chemical reactions.
Look at the picture below. The number of electrons is equal to the number of what?
Look at the picture below. What name is given to the part of the atom where the protons and neutrons are?
Look at the picture below. What is the atomic number of a sodium atom?
Look at the picture below. What is the mass number of sodium? Give your answer to the nearest whole number.
Look at the picture below. The number of protons and the number of neutrons together is know as the
The mass number of hydrogen is 1. How many protons does a hydrogen atom have?
How many electrons are there in an atom of hydrogen?
How many neutrons does a normal hydrogen atom have?
The atomic number of calcium is 20. How many protons does it have?
What one word completes this sentence? In an atom the number of electrons is always equal to the number of
The diagram shows the nuclear model of the atom. Name the part of the atom labelled 1.
Look at the diagram below. It shows the Bohr model of the atom. Name the particle labelled 2.
True or false? Most of an atom is empty space.
What is the highest number of electrons that can be in electron shell 2?
What is the overall charge on an atom?
The atomic number of potassium is 19. How many electrons does this element have?
How many electrons does potassium have in its outside electron shell?
How many electrons are in the outer electron shell of every element in group 1?
Neon is a noble gas. How many electrons does an atom of neon have in its outer shell?
Elements in the same group of the periodic table have the same number of
Gallium is an element with the symbol Ga. How many electrons does gallium have in its outer shell? Use the periodic table below to help you.
Dan says that all the elements in group 5 of the periodic table have five electrons in their outer shell. Is he right?
True or false? Elements in the same group of the periodic table have similar properties because they have the same number of neutrons in their outer shells.
Lithium has a nucleon number of 7 and a proton number of 3. How many neutrons does it have?
Carbon has a nucleon number of 12 and a proton number of 6. How many neutrons does it have?
Sodium has a nucleon number of 23 and a proton number of 11. How many neutrons does it have?
