Science: Density and Matter

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Which group of elements is highly reactive and have 1 valence electron?

Group 2A
Group 3A
Group 1A (Alkali Metals) (correct)
Group 7A (Halogens)

Which element group has 8 valence electrons and does not have any charge?

Group 4A (Carbon)
Group 5A (Nitrogen)
Group 6A (Oxygen)
Group 8A (Noble Gases) (correct)

Which block of elements is mostly dense and hard?

Representative Elements
Transition Metals (correct)
Actinides
Inner Transition

Which group of elements has 2 valence electrons and forms a +2 charged ion?

Group 2A (Alkaline Earth Metals) (D) Signup and view all the answers

Which element group is designated with the letter 'A' and includes groups 1A to 8A?

Representative Elements (A) Signup and view all the answers

Which element group has a total of 7 valence electrons and forms a -1 charged ion?

Group 7A (Halogens) (D) Signup and view all the answers

What is the unit used to measure density?

All of the above (D) Signup and view all the answers

Which statement about matter is true?

Matter is made up of atoms and molecules (B) Signup and view all the answers

What is the triple point of pure water?

0.01°C and 4.58 mm Hg (B) Signup and view all the answers

What is the difference between a liquid and a gas?

All of the above (D) Signup and view all the answers

What is the relationship between the phases of matter and intermolecular forces?

Intermolecular forces increase from gas to liquid to solid (C) Signup and view all the answers

What is the difference between a vapor and a gas?

Vapors are the gaseous phase of a substance that is a liquid under normal conditions (B) Signup and view all the answers

According to the kinetic molecular theory of gases, what is the relationship between the molecules in a gas?

The gas molecules are far apart from one another compared to their size and in constant rapid motion in random directions. (A) Signup and view all the answers

What is the relationship between the kinetic energy of gas molecules and the process of evaporation?

Molecules with high kinetic energy evaporate, while molecules with medium kinetic energy are pulled back to the liquid. (C) Signup and view all the answers

What is the purpose of liquefaction of gases?

To decrease the volume of the gas. (A) Signup and view all the answers

What was the contribution of J.J. Thomson to the understanding of the atom?

He concluded that the atom had negatively charged particles called corpuscles, which are now known as electrons. (A) Signup and view all the answers

What was the main conclusion of Rutherford's gold foil experiment?

The atom has a small, dense positively charged center called the nucleus. (D) Signup and view all the answers

What is the relationship between the atomic number and the charge of an atom?

The atomic number is equal to the number of protons, and the charge of the atom is equal to the number of protons minus the number of electrons. (B) Signup and view all the answers

What is the relationship between the mass number and the subatomic particles of an atom?

The mass number is equal to the number of protons plus the number of neutrons. (C) Signup and view all the answers