I rate this.
Mendeleev's masterpiece.
Such pretty colours...
What am I?
Attatchment Issues!
100
What is a catalyst?
Substance that speeds up a chemical reaction but is not used up in a reaction
100
What is the chemical symbol for Chlorine?
Cl
100
Finish the sentence
Acidic solutions have a pH _______
below 7
100
The positively charged particles we find in the centre of atoms.
Proton
100
How many atoms are present in a diatomic molecule?
2
200
What effect does increasing the particle size have on the rate of reaction?
Decreases reaction rate
200
Write the name for a compound when Hydrogen and Oxygen are joined together.
Water.
200
What is true of concentrations of ions in a neutral solution?
H+ ions and OH- ions have equal concentration
200
Proteins which catalyse or speed up chemical
reactions.
Enzyme
200
What is a covalent bond?
Shared pair of electrons.
300
What effect does increasing the concentration of a reactant on rate of reaction?
Increases the rate of reaction
300
Why is an atom neutral?
Atoms are neutral because the number of electrons is equal to the number of protons
300
What happens to the concentration of ions in an alkaline solution when diluted?
The overall concentration of OH- ions decrease when an alkaline solution is diluted
300
The central part of an atom. It contains protons and
neutrons, and has most of the mass of the atom.
Nucleus
300
What is an ionic bond?
Electrostatic attraction between positive and negative ions
400
What is the units if a student measures the mass of gas being produced over different time intervals in seconds?
g/s
gs-1
400
What is an isotope?
Atoms with the same atomic number but different mass numbers
Atoms with the same number of protons but different numbers of neutrons
400
Soluble non-metal oxide form what type of solutions when dissolved in water?
Acidic solutions
400
A method for accurately finding volumes involved in chemical reactions.
Titration
400
Why do ionic compounds conduct electricity?
Ions are free to move when in solution or molten
500
Draw a graph to show the difference in rate when the reaction is carried out at a low and high temperature
500
What is the mass of 1 mole of sodium hydroxide?
(use your databook)
40
500
What is the definition of a spectator ion?
Spectator ions are ions that remain unchanged during a chemical reaction
500
The substance formed when the hydrogen ion in an acid is replaced by a metal ion.
Salt
500
Why do covalent molecular structures have a low melting point?
Less energy to break the weak forces of attraction between the molecules