Edexcel 1

Welcome to your Edexcel 1

Isotopes have similar chemical properties because they have the same...
Three isotopes of a newly discovered element X are 117-X (relative abundance 3), 119-X (relative abundance 5) and 121-X (relative abundance 7). What is the relative atomic mass of element X?
The atomic mass of the ion of an element A+ is 23 and it has 10 electrons. How many protons, neutrons and electrons are present in the neutral atom A?
One mole of gaseous atoms forms one mole of gaseous ions with a single positive charge in __________?
Why does helium have higher first ionisation energy than hydrogen?
Which of the following statements about ionic compounds is true?
Which of the following best describes the result of X-ray diffraction of hydrogen?
Which of the following statements is correct?
I. Polar molecules are symmetrical
II. Non-polar molecules can contain polar bonds
III. Van der Waals forces occur due to temporary dipoles
What type of bonding exists in ammonium chloride (NH4Cl)?
The bond angle in chlorine trifluoride (ClF3) is approximately equal to?
All uncombined elements have an oxidation number of?
If the oxidising agent in an experiment is bromine water, then it can be classified as?
When sulphur dioxide is formed from sulphate ions, what is the change in oxidation number of sulphur?
What happens to a reactant in a disproportionation reaction?
The oxidation number of carbon in carbonate ion is?
Which of the following is correct about barium?
What is the reaction called in which chlorine reacts with sodium hydroxide to form sodium chlorate (I)?
Which of the following is incorrect about magnesium?
Which of the following reacts with potassium bromide to give a yellow solution?
Which halide ion gives a pale yellow precipitate with silver nitrate?
Relative atomic mass is the average mass of one atom compared to one-twelfth of the mass of one atom of?
What is the concentration of the solution when 16g of sodium chloride is dissolved in 250 cubic centimetres of water?
Calculate the mass of nitrogen gas that has a pressure of 100 kPa, temperature of 25 degrees centigrade, and a volume of 500 cubic centimetres? (R = 8.31)
Avogadro's Constant can be used for?
How many atoms of magnesium are present in an 18g sample of magnesium metal?
The bond angle in chlorine trifluoride (ClF3) is approximately equal to?