30 Questions
Which term describes a mixture of two or more metals or a metal and a non-metal that cannot be separated into their components by physical methods?
Alloy
In the alloy brass, what is the percentage composition of zinc?
30%
What is the solute in a solution of iodine in alcohol (tincture of iodine)?
Iodine
Which component of a solution dissolves the other component in it and is usually present in larger amount?
Solvent
Which type of solution are aerated drinks like soda water classified as?
Gas in gas solution
What is the approximate oxygen content in air, which is a homogeneous mixture of gases?
21%
Which activity from the text suggests that particles of matter have force acting between them?
Cutting the surface of water with fingers
What kind of particles are being compared to students in the text?
Subatomic particles
Which substance from the options is likely to have its particles held together with the greatest force?
Iron nail
Why can a diver cut through water in a swimming pool?
Due to the particles of water attracting each other
Which substance from the options is not considered matter?
Love
Why does the smell of hot sizzling food reach you from several meters away compared to cold food?
Hot food molecules move faster
What is the building block of all matter according to the text?
Atoms
How are atoms described in terms of size?
Barely visible to the human eye
What did Berzilius suggest about the symbols of elements?
Symbols should be derived from the name of the element
Which scientist was the first to use symbols for elements in a specific sense?
Dalton
How is the atomic radius of an atom typically measured?
In nanometres
What did Dalton's postulate help explain?
The law of definite proportions
What causes the palm to feel cool when acetone (nail polish remover) is poured on it?
The particles gain energy from the palm and surroundings and evaporate
Why do people sprinkle water on a hot roof or ground after a sunny day?
To cool the hot surface through evaporation
Why does cotton clothing help in keeping the body cool during summer?
Cotton absorbs sweat and allows for easy evaporation
Why do we see water droplets on the outer surface of a glass containing ice-cold water?
The water vapor in the air condenses upon contact with the cold glass
In which process do particles at the surface of a liquid gain energy from the surroundings and change into vapor?
Evaporation
Why does a desert cooler cool better on a hot dry day?
The dry air allows for faster evaporation, increasing cooling effect
What was initially used as the basis for the atomic mass unit?
1/16 of the mass of an atom of naturally occurring oxygen
Why was the 1/16 of the mass of an oxygen atom chosen as the initial atomic mass unit?
Oxygen reacts with a large number of elements
Why was the carbon-12 isotope chosen as the standard reference for measuring atomic masses in 1961?
To have atomic masses as whole numbers or close to whole numbers
What does one atomic mass unit equal?
1/12th the mass of one atom of carbon-12
How does the analogy of selling fruits by relative mass units relate to atomic masses?
It illustrates how atomic masses are relative to carbon-12
What is the purpose of using a standardized atomic mass unit?
To have a consistent reference for comparing atomic masses
Learn about the characteristics of alloys and solutions, which are mixtures commonly found in the field of chemistry. Understand the properties and compositions of alloys like brass, as well as the components of solutions including solvents and solutes.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
