Theories About Matter

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Results for Theories of Matter 1. First of all, who named a single indivisible particle of matter an atom? Your Answer: John Dalton The correct answer was Democritus.

He believed that different atoms are of different sizes, have regular geometric shapes, and are in constant motion. He also believed that there is empty space betweeen atoms. 26% of players have answered correctly.

2. Who was a Greek that severely criticized the theory of atoms in continuous motion and proposed the fourelement theory of matter? Your Answer: Aristotle

The thory was based on the idea that all matter is made up of four basic substances: earth, water, air, and fire. Aristotle and his followers believed that each of these basic substances had different combinations of four specific qualities: dry, moist, cold, and hot. 31% of players have answered correctly.

3. Which of the following is not part of John Dalton's theory about atoms in 1803?

Your Answer: In chemical reactions some of the atoms are destroyed

On contrary, Dalton proposed that in chemical reactions, atoms join together or separate from each other but are not destroyed. This explained the law of conservation of mass, which was observed by earlier scientists. 69% of players have answered correctly.

4. What did J.J. Thomson use in order to measure the mass of the atom and its electric charge in 1897? Your Answer: cathode ray tube

J.J. Thomson (1856-1940) used the most primitive tool of the listed above since he could not have an electronic microscope or a mass spectrometer at the time. CANDU is a Canadian-designed nuclear reactor system. 64% of players have answered correctly.

5. In J.J. Thomson's 1897 model the electrons were located inside the nucleus (although it wasn't yet called a nucleus.) Your Answer: False The correct answer was t.

At 1904, a Japanese scientist Nantaro Nagaoka represented the atom as a large positively charged sphere surrounded by a ring of negative electrons and until 1911, there was no evidence to contradict either theory. 58% of players have answered correctly.

6. What type of particles did Ernest Rutherford use in his 1911 experiment with gold foil? Your Answer: alpha particles

Alpha particle is basically the nucleus of a helium atom produced by radioactive decay of uranium. 66% of players have answered correctly.

7. In 1932. what did James Chadwick theorize that an atom must contain? Your Answer: Neutrons

James Chadwick (1891-1974) modified Ernest Rutherford's model by demonstrating that atomic nuclei must contain heavy neutral particles in order for the nuclei to have the proper mass. 64% of players have answered correctly.

8. Who developed the concept of atomic number? Your Answer: J. Newlands The correct answer was H.

Moseley.

Mendeleev, Newlands, and Meyer worked towards creating a periodic table, but the concept of atomic number was developed by Moseley. Moseley's research with X-rays showed that the nucleus of each element has its own, unique positive charge. The positive charge increases one by one as the elements progress through Mendeleev's periodic table. Moseley was the first to recognize the relationship between atomic number and nuclear charge. 27% of players have answered correctly.

9. Who is credited with developing the idea of an isotope? Your Answer: J. Moseley The correct answer was Frederick

Soddy.

Frederick Soddy was the first to propose that the number of neutrons can vary from atom to atom within the same element. 26% of players have answered correctly.

10. Which important scientist created the theory that electrons are located within a fixed distance from the nucleus on a certain energy level? Your Answer: N. Bohr

Energy level is a state with

Results for Inside The Atom 1. Atoms consists of which particles? Your Answer: Protons-Neutrons-Electrons

Atoms are the smallest units of matter that can take part in a chemical reaction, and which cannot be broken down chemically into anything simpler. 97% of players have answered correctly.

2. Atom comes from the Greek word 'atomos' which means undivided. Now we know that atoms in fact are divided into different particles(see question 1). Protons and neutrons can be further divided into even smaller parts. What do we call these smaller parts that makes up protons and neutrons? Your Answer: Neutrinos The correct answer was Quarks.

The term 'Quark' was first introduced by the famous US physicist Murray Gell-Mann. 82% of players have answered correctly.

3. There are six types or 'flavours' of quarks. The first five quarks are called: Up, Down, Top, Bottom and Strange. What is the name of the last quark? Your Answer: Charmed

Each of the six quarks also has three varieties or 'colours': red, green and blue(visual colour is not meant, but the analogy is useful in many ways). 62% of players have answered correctly.

4. Who discovered the electron? Your Answer: J.J. Thomson

Thomson was experimenting with currents of electricity inside empty glass tubes. He was investigating a long-standing puzzle known as 'cathode rays.' His experiments prompted him to make a bold proposal: these mysterious rays are streams of particles much smaller than atoms, they are in fact minuscule pieces of atoms. He called these particles 'corpuscles,' and suggested that they might make up all of the matter in atoms. 49% of players have answered correctly.

5. The muon is a particle similar to the electron except for its mass. How much heavier is the muon compared to the electron? --Your Answer: 97 times The correct answer was 207

times.

The muon has a half-life of 2 millionths of a second, decaying into electrons and neutrinos. 32% of players have answered correctly.

6. What do you call this group of unstable subatomic particles with masses intermediate between that of the electron and that of the proton? Your Answer: Mesons

Mesons are found in cosmic radiation, and is emitted by nuclei under bombardment by very high-energy particles. 49% of players have answered correctly.

7. To which group of particles does the electron belong? Your Answer: Leptons

The electrons in each atom surround the nucleus in groupings called shells. 66% of players have answered correctly.

8. True or false: The spin of bosons can only take values

that are whole numbers or zero? Your Answer: true

Unlike fermions, more than one boson in a system(such as an atom) can prossess the same energy state. This statement is known as the Bose-Einstein law. 62% of players have answered correctly.

9. The baryons form a subclass of the? Your Answer: [No Answer] The correct answer was Hadrons

& hadrons.

Protons and neutrons both belong to the group of baryons. 21% of players have answered correctly.

10. The lambda, xi, sigma, and omega particles belong to which group of highly unstable elementary particles? Your Answer: gamma The correct answer was Hyperons

& hyperon.

Hyperons includes all the baryons with the exception of protons and neutrons. 3% of players have answered correctly.