Quiz 7 Flashcards
- Of the following elements the one that always has the oxidation number –1 in its compound is
hydrogen
sodium
fluorine
oxygen
fluorine
- If an element is in its lowest oxidation state, under appropriate circumstances, it can act as
a reducing agent
an oxidizing agent
either an oxidizing agent or a reducing agent depending upon whether its oxidizing number is negative or positive
neither an oxidizing agent nor a reducing agent
an oxidizing agent
- The atom with high electronegativity value
a small tendency to attract electrons
no tendency to attract electrons
a large tendency to attract electrons
the attraction for electrons does not depend upon electronegativity but upon electron affinity
a large tendency to attract electrons
- Which pair of elements is most likely to combine to form compounds by sharing electrons?
Li and F
B and C
Cs and I
Mg and O
B and C
- An isotope of hydrogen is
neptunium
plutonium
thorium
tritium
tritium
- Which element has the greatest tendency to lose electrons?
F
S
Fr
Be
Fr
- An electron emitted from the nucleus of a radioactive element is called
positron
antiproton
β-particle
alpha particle
β-particle
- Transmutation of element was first of all achieved in the laboratory by
Rutherford
Hertz
Fermi
Strassman and Hahn
Strassman and Hahn
- In a chemical reaction equilibrium is said to have been established when the
Concentrations of reactants and products are equal
Opposing reaction cease
Velocities of opposing reactions become equal
Temperatures of opposing reactions are equal
Velocities of opposing reactions become equal
- A pressure cooker reduces cooking time because _______.
The heat is more evenly distributed
The higher pressure tenderizes the food
The boiling point is elevated
A large flame must be used
The boiling point is elevated
- The movement of gas molecules through a pinhole.
diffusion
effusion
transmission
desorption
effusion
- It is the point in a phase diagram at which the last drop of liquid disappears.
dew point
bubble point
saturation point
tie line
dew point
- Crystallization occurs in a solution that is
concentrated
unsaturated
supersaturated
saturated
supersaturated
- Milk is a example of
Gel
Sol
Foam
Emulsion
Emulsion
- An aerosol is a colloidal system consisting of
A gas dispersed in solid
A liquid dispersed in solid
A liquid dispersed in a gas
A solid dispersed in a gas
A solid dispersed in a gas
- Which one of the following is a colloid?
Blood
Cane sugar
Urea
NaCl
Blood
- Colloids and crystalloids differs in
Solubility
Particle size
Radius
Diameter
Particle size
- Buffer solutions have
Reserve acidity only
Reserve alkalinity
pH equal to 7
Reserve acidity as well as reserve alkalinity
Reserve acidity as well as reserve alkalinity
- The bond formed between hydrogen and halogen is of
covalent nature
electrovalent nature
polar nature
Co – ordinate nature
Covalent nature
- Aqua regia is prepared by adding conc. HNO3 to
conc. H2SO4
conc. H3PO4
conc. HCl
conc. HBr
conc. HCl
- Which is the strongest acid amongst the following?
HClO
HClO2
HClO3
HClO4
HClO4
- What do you call the volume occupied by a unit mass of fluid?
specific volume
density
specific gravity
specific weight
specific volume
- A leak from a faucet comes out in separate drops. Which of the following is the main cause of this phenomenon?
gravity
air resistance
viscosity of the fluid
surface tension
surface tension
- Hydrometer is used to find out
specific gravity of liquids
specific gravity of solids
specific gravity of gases
relative humidity
specific gravity of liquids
- Who determined that energy is radiated only when an electron falls from a higher energy level to a lower energy level?
Einstein
Rutherford
Heisenberg
Bohr
Bohr
- Who determined the charge of an electron by means of the oil droplet experiment?
Rutherford
Heisenberg
Millikan
de Broglie
Millikan
- Who showed that electrons can be considered to have both particle character and wave character?
Thompson
Moseley
Heisenberg
de Broglie
de Broglie
- Who determined that no two electrons may have the same set of four quantum numbers?
Planck
Pauli
Hund
Rutherford
Pauli
- The quantity of heat needed to raise the temperature of a substance 1°C is its
heat capacity
specific heat
enthalpy
calorimetry
heat capacity
- The properties of a real gas are most likely to deviate from those properties predicted for an ideal gas when
the pressure is low
the temperature is high
the pressure is high and the temperature is low
the pressure is low and the temperature is high
the pressure is high and the temperature is low
- From the thermal decomposition of a pure solid, we obtained a solid and a gas, each of which is a pure substance. From this information, we can conclude with certainty that
the original solid is not an element
at least one of the products is an element
both products are elements
the solid is a compound and the gas is an element
the original solid is not an element
- The critical point for a mixture occurs for which of the following cases?
the vapor and liquid have a single form
the liquid has no absorbed gas
the vapor phase is stable
the liquid is completely vaporized
the vapor and liquid have a single form
- Which of the following elements and compounds is unstable in its pure form?
sodium
helium
carbon dioxide
neon
sodium
- A substance is oxidized when which of the following occurs?
it turns red
it becomes more negative
it loses electrons
it gives off heat
it loses electrons
- Which of the following affects most of the electrical and thermal properties of materials?
the atomic weight expressed in grams per gram-atom
the electrons, particularly the outermost ones
the magnitude of the electrical charge of the protons
the weight of the atoms
the electrons, particularly the outermost ones
- In molecules of the same composition, what are variations of atomic arrangements known as?
polymers
monomers
crystal systems
isomers
isomers
- What device is used to measure the amount of infrared radiation in each portion of a persons skin that is emitted?
thermograph
thermometer
pyrometer
potentiometer
thermograph
- If the freezing point of water is 0°C, which of the following is its melting point?
slightly less than 0°C
slightly more than 0°C
0°C
32°C
0°C
- The amount of heat required to change the substance from solid to liquid state without change in temperature is known as the latent heat of _____.
evaporation
vaporization
condensation
fusion
fusion
- Why are metals good conductors of heat?
because they contain free electrons
because their atoms are relatively far apart
because their atoms collide frequently
because they have reflecting surfaces
because they contain free electrons
- What usually happen when a vapor condenses into a liquid?
it evolves heat
it generates heat
its temperature increases
it boils with temperature less than 100°C
it evolves heat
- Which of the following is the science of low temperatures?
thermokinetics
thermodynamics
ergonomics
cryogenics
cryogenics
- Calcite is
potassium carbonate
calcium carbonate
sodium hydroxide
calcium hydroxide
calcium carbonate
- The number of molecules in 22.4 liters (under standard conditions) of a substance in its gaseous state, is called
Dulong’s number
Petit’s number
Avogadro’s number
Gay-Lussac’s number
Avogadro’s number
- Ozone, O3, filters out a large amount of the ultraviolet and other dangerous radiations from the sun. It is found in the:
troposphere
thermosphere
stratosphere
lithosphere
stratosphere
- One ingredient present in all baking powder is
sodium citrate
sodium betabisulfate
sodium bicarbonate
potassium tartrate
sodium bicarbonate
- What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degree Celsius?
kilojoule
BTU
kilocalorie
latent heat
kilocalorie
- Who coined the word energy?
James Joule
Tomas Young
Rodulf Diesel
Lord Kelvin
Tomas Young
- Isotopes have different
period number
group number
number of nucleons
atomic number
number of nucleons
