Leaving Cert Chemistry

The Particulate Nature of Matter means that all matter is composed of
1. small particles
2. atoms only
3. molecules only
4. atoms or ions
Aristotle, the Greek philosopher believed that all matter was made up of four elements. Which one of the following was not one of these elements?
1. air
2. earth
3. smoke
4. water
The Law of conservation of mass explains how
1. in nature, the mass of all atoms are equal
2. in a chemical reaction, the mass of the reactants is always equal to the mass of the products
3. the mass of two or more substances reacting together may increase after the reaction
4. the mass of a substance may decrease after burning in air
When diffusion between two gases occurs
1. the particles spread out and mingle with each other
2. the particles always come together to react and form a new substance
3. the atoms making up the gases break apart and spread as far apart as possible
4. the particles move in a well-defined pattern of motion
Which one of the following is an example of diffusion?
1. adding milk to a cup of coffee
2. the freezing water to form ice
3. cooking a hard-boiled egg
4. cooking chips in a deep fat fryer
When diffusion occurs between two gases such as hydrogen (red) and helium (green), which of the following diagrams best represents what is most likely to occur?
In the early 1800s, an English chemist John Dalton proposed an atomic theory consisting of a number of assumptions. Four of these assumptions are given below. Which one of these is no longer known to be true?
1. All matter consists of tiny particles called atoms.
2. Atoms cannot be created, destroyed nor broken down into smaller parts
3. All atoms of the same element are identical
4. When elements react, their atoms combine in simple whole number ratios
Around the 1870s, this scientist studied mysterious rays in sealed glass tubes.
1. William Crookes
2. James Chadwick
3. Robert Millikan
4. Ernest Rutherford
In the Maltese Cross experiment performed by William Crookes, which one of the following is not true?
1. Electrons leave the cathode under a very high voltage
2. All of the electrons leaving the cathode are absorbed by the Maltese cross
3. This experiment shows that cathode rays travel in straight lines
4. A fluorescence appears on the far end of the screen where the cathode rays strike the tube
Which property of cathode rays did the apparatus shown prove?
1. Cathode rays have mass.
2. Cathode rays are deflected by magnetic fields.
3. Cathode rays have a negative charge.
4. Cathode rays are composed of electrons.
Which one of the following is a property of cathode rays?
1. They can be deflected by electric fields.
2. They have no charge.
3. They consist of electromagnetic radiation with zero mass.
4. They are unaffected by magnetic fields.
The term 'electron' was first proposed by which physics professor?
1. George Stoney
2. Ernest Rutherford
3. Robert Millikan
4. J J Thomson
In 1897, J J Thomson studied cathode rays using an apparatus similar to that shown. From the results of his experiments, he concluded that
1. cathode rays were negatively charged particles
2. cathode rays were high speed protons
3. cathode rays were not deflected by magnetic fields
4. the charge on an electron was 1.6 x 10^-19C
The ratio of the charge on an electron to its mass is known as its specific charge (e/m). J J Thomson first calculated this value in 1897. The value for the charge (e) and the mass (m) were later found in 1909 as a result of which famous experiment?
1. Millikan's oil drop
2. Thomson's plum pudding
3. Rutherford's gold foil
4. Crooke's cathode rays
As a result of an experiment carried out in 1909 by Geiger and Marsden, Rutherford deduced that
1. atoms contain negatively charged particles
2. a positive charge was concentrated in a small dense nucleus of the atom
3. the neutron was discovered in the nucleus of the atom
4. alpha particles consisted of a helium nucleus with a positive charge
As a result of bombarding beryllium with alpha-particles in 1932, the neutron was discovered. Which scientist is creditted with this discovery?
1. James Chadwick
2. Ernest Rutherford
3. Robert Millikan
4. Albert Einstein
The diagram shows a cathode ray tube. Which one of the following statements is correct?
1. A is the cathode and C is a negatively charged plate
2. B is the cathode and D is a positively charged plate
3. A is the cathode and C is a positively charged plate
4. A is the anode and B is the cathode
The apparatus used for Millikan's famous oil-drop experiment is shown in the diagram. With reference to this experiment, which one of the following statements is correct?
1. This experiment allowed Millikan to determine the mass of an electron for the very first time.
2. The upward electric force on the oil-drops must be greater than the gravitational force on the drops.
3. The charge on the electric plates does not effect the velocity of the falling oil-drops.
4. Millikan found that the charges on the oil-drops were a whole number multiple of a basic value.
The gold leaf experiment was carried out in 1911 by Geiger and Marsden. The diagram shows the apparatus used.
Name the labelled parts.
1. A = beam of alpha-particles, B = gold foil, C = lead block
2. A = source of alpha-particles, B = lead block, C = lead block
3. A = beam of alpha-particles, B = gold foil, C = lead block
4. A = beam of alpha-particles, B = gold foilo, C = lead block
The proton, neutron and electron were respectively discovered by
1. Rutherford, Chadwick and Thomson
2. Marsden, Chadwick and Thomson
3. Rutherford, Chadwick and Stoney
4. Chadwick, Rutherford and Thomson.

Leaving Cert Chemistry - The Atom

Multiple Choice Quiz