Past Paper Questions Flashcards
what is the state of bromine at 100’C
Gas
what temperature does chlorine gas condense at to form a liquid
-35’C
going down group 7 the melting points…
This is because the size of the molecules increases so the intermolecular forces…
Increase
Increase
A teacher investigated the reaction of iron with chlorine
Why did they do the investigation in a fume cupboard
Chlorine gas is toxic
Iron with chlorine (iron chloride) investigation
What happened to the mass of the glass tube and contents during reaction + reason
Increased
Chlorine atoms are now part of the solid
Predict what you would observe when fluorine gas reacts with ion
Burns very vigorously (violently)
Balance equation for the reaction between iron and bromine
2Fe + _______ Br(2) ——> 2FeBr(3)
3Br(2)
Calculate the relative formula mass of FeBr(3)
Relative atomic masses -Fe =56 Br=80
56 + (3 x 80) = 296
Atoms were first thought to be tiny spheres that could not be divided
Which particle was discovered to change this model of the atom?
Electron
Which type of particle was fired at the gold atoms?
Alpha
Which scientist first suggested that electrons orbit the nucleus at specific distances
Bohr
Atoms of the same element have the same atomic number because they have the same number of…
Protons
Atoms of the same element can have different mass numbers because they have different numbers of…
Neutrons
Atoms have no overall charge because they have the same number of..
Protons and electrons
A teacher uses a ball of radius 1cm to represent the nucleus
What could represent the atom on the same scale
A sports arena of radius 100m
Hydrogen reacts with oxygen to produce water
Complete word equation for the reaction
Hydrogen + oxygen —>
Water
The reaction between hydrogen and oxygen is used in a hydrogen fuel cell
What is the reason for using this reaction in a fuel cell
To produce a potential difference
Which 2 metal electrodes would produce the greatest voltage when used in the chemical cell
Give reason
Magnesium and copper
The metals have the largest difference in reactivity
This question is about electrolysis
A students investigated the hypothesis:
“The electrolysis of a salt solution produces a metal at the negative electrode
