3272-2-Phy (2.1)

An atom with 3 free electrons in its outer shell is said to be. pentavalent. covalent. trivalent.

What is the mass number of an element?. Number of electrons and protons. Number of neutrons and protons. Number of electrons and neutrons.

What do you get when you add 2H2 and O?. H2 O. 2H2 O. 2H2 O2.

The splitting of a chemical compound is called. bombardment. synthesis. analysis.

What is the atomic number of an element?. The number of neutrons in the atom. The number of electrons in the atom. The number of protons in the atom.

An atom with 5 free electrons is said to be. pentavalet. covalent. trivalent.

An atom consists of. protons, neutron and electrons. protons and electrons. protons and neutrons.

The maximum number of electrons in the inner shell of an atom is. 8. 2. 4.

The mass of a proton equals the mass of a. neutron. beta particle. electron.

Catalysts. speed up reactions. speed up and slow down reactions. slow down reactions.

If the outer shell of an atom is full the the element is. unstable / reactive. a good conductor. practically inert.

Molecules of the same compound are held together by. cohesive forces. adhesive forces. gravitational forces.

Oxygen has a valency of. 2. 6. 8.

The further from the nucleus the shells are in an atom. the shells retain the same spacing from each other. the closer the shells get to each other. the further the shells get from each other.

What determines an element's identity?. The number of neutrons. The number of electrons. The number of protons.

An isotope of an element will have more/less _________ than usual. electrons. neutrons. protons.

The smallest part of an element is. a compound. an atom. a molecule.

The nucleus of an atom contains. protons and electrons. protons and neutrons. electrons and neutrons.

What is atomic mass?. Number of neutrons. Number of protons plus the number of neutrons. Number of protons.

An ice melted into a liquid will take up. the same amount of space. less space. more space.

What form of heat is used to turn a solid into a liquid?. specific heat. coefficient of heat. heat of fusion.

Change from solid to gas state without going through liquid state is called. transformation. sublimation. state leap.

What is the smallest particle of matter that can exist in nature?. A molecule. An isotope. An atom.

A positive ion. has extra electrons. has missing electrons. is a radioactive isotope.

The isotope of a carbon atom C14 to C12 will have. same numbers of neutrons. same numbers of protons. same number of electrons.

If an atom has 2 protons, how many electrons will it have?. 1. 8. 2.

A molecule with like atoms is said to be a. neutroid. compound. element.

Two elements in the same substance is said to be a. mixture. element. compound.

The number of protons in an atom is equal to the number of. electrons. neutrons. mass number.

The charge of an electron is. neutral. negative. positive.

A valance electron is an electron. in the innermost shell. in the outermost shell. which is not within an atom.

Molecules of unlike atoms are combined by their. adhesive force. magnetic force. cohesive force.

What is the difference between hydrogen, deuterium and tritium?. The number of electrons. The number of protons. The number of neutrons.

The smallest material in the universe is. an ion. helium. hydrogen.

What is the atomic number of the element shown here? (It is not hydrogen, just fictional element) 4H 3. 4. 3. 7.

What is the mass number of the element shown here? 5 CI 4. 4. 5. 9.

There are solids, liquids and gases present in the universe and every unit of theirs occupy some space. This is called. matter. compound. mass.

An atom deficient of a valency electron is deficient. of an electron in the outer shell. of a neutron in the outer shell. of an electron in the inner shell.

The maximum number of electrons in the second shell is. 4. 8. 2.

What does an oxygen atom consist of?. Protons, neutrons and electrons. Protons and electrons. Protons and neutrons.

Surface molecular attraction between two different molecules is. adhesive. gravitational. cohesive.

The atomic mass number is the number of. protons plus electrons. neutrons plus electrons. protons plus neutrons.

A catalyst in a chemical reaction does what?. Can either speed it up or slow it down. Speeds it up. Slows it down.

What is the number of electrons in the inner-most shell of an atom?. 4. 8. 2.

What form of heat is used to turn a solid into a gas?. Sensible heat. Specific heat. Latent heat.

The heat required to change a liquid to a gas at constant temperature is the heat of. fusion. condensation. vaporisation.

An atom with a full outer shell is. practically inert. a good insulator. a good conductor.

An element with a full valence shell is. very reactive. good conductor. inert.

A substance of two or more different atoms is. a neutrino. an isotope. a chemical compound.

An atom with 5 electrons in its outer shell is. trivalent. pentavelent. covalent.

Protons have. no charge. positive charge. negative charge.

Producing a compound from commonly available materials is. synthesis. analysis. bombardment.

A different number of nucleons in the nucleus of atoms would represent. semiconductor. isotopes. isotones.

Molecules of matter are in constant motion. The amount of vibration or motion is dependent on. temperature. volume. pressure.

When a chemical change takes place, the smallest particle indivisible in an element is called. an atom. an electron. a neutron.

A nucleus of an atom consists of. positively charged particles. a nucleus and normally has no overall charge at all and so is neutral. negatively charged particles.

A compound is a. mixture of more than one element which are chemically bonded together. solution (either liquid or solid) of elements or mixtures of elements to form a new material. mixture of more than one element which are mixed together.

A compound such as water can exist in how many states?. 2. 3. 1.

Select the correct statement from the following. Temperature is the only factor which can affect the state in which matter exists. Matter can only exist in one of three states. As temperature rises a solid will always become a liquid and then a gas.

Isotopes of an element have. a different atomic number. the same number of neutrons but a different number of protons. the same number of protons but a different number of neutrons.

Neutrons have. no charge. a positive charge. a negative charge.

Atomic MASS number is the number of. protons. protons and neutrons. electrons.

How many electrons does an `S` orbital hold?. 6. 8. 2.

The number of electrons in a stable atom equals. the number of neutrons in the nucleus. the number of protons and neutrons in the nucleus. the number of protons in the nucleus.

An isotope of an element has. the same atomic number but a different mass number. the same mass number but a different atomic number. a different mass and atomic number.

The mass number of an element is based on. the total number of protons and neutrons in its nucleus. the number of protons in its nucleus. the number of neutrons in its nucleus.

The atomic weight of all atoms is related to. Hydrogen. Carbon. Helium.

The chemical bonding of two or more elements is called. chemical analysis. chemical synthesis. chemical fusion.

Two or more elements that are chemically bonded together and have an even mass distribution form a. mixture. substance. chemical compound.

An atom that gains one or more additional electrons is called. a negative ion. a positive ion. an isotope.

Ionic bonding involves. electron sharing. attraction to a free electron cloud. electron transfer.

Non-metals form. covalent bonds. ionic bond. metallic bonds.

Brownian Movement describes. the attraction of neutrons. the attraction of electrons. the motion of molecules.

Elements on the extreme right of the periodic table are. metals. non-metals. transition metals.

Oxygen, atomic number 8 is. trivalent. univalent. bivalent.

The atomic number of the atom of an element is based on. the number of neutrons in to nucleus. the number of protons in its nucleus. the total number of protons and neutrons in its nucleus.

Water is. an element. a mixture. a compound.

The Mass of a Proton is approximately. equal to the mass of an electron. equal to the relative mass of a molecule. 2000 times greater than the mass of an electron.

Noble gases are _______ and _______ and have a full outer shell of electrons. fluorine and neon. sulphur and neon. helium, neon, argon.

If a hydrogen atom has 2 neutrons and 1 proton what kind of water would you get?. Fresh water. Heavy water. Salt water.

A majority of an atom's mass is in the. compound. isotope. nucleus.

An insulator has its electrons. totally free from the atoms. loosely bound. tightly bound.

The centre of gravity of an aircraft is adjusted by two weights, 10 kg and 5 ckg plaed 4m and 2 m aft of the c of g. To what position must a 20 kg weight be added to balance the c of g?. 2.5m. 4m. 2m.