Complete the following statements: (i) The three ____________________________________ are solid, liquid and ____________ . (ii) The three _______________ scales are degree Celsius, Kelvin and ____________________ . (iii) Pure substances have a ____________ composition whereas mixtures have a __________ composition. Homogeneous mixtures have a _______________ composition. When a solute is ___________ in water, the homogeneous mixture formed is called ____________________ (iv) CoSO4 is ______________ whereas CoSO4·7H2O is _______________
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Complete the following statements:
(i) The three ____________________________________ are solid, liquid and ____________ .
(ii) The three _______________ scales are degree Celsius, Kelvin and ____________________ .
(iii) Pure substances have a ____________ composition whereas mixtures have a __________
composition. Homogeneous mixtures have a _______________ composition. When a solute
is ___________ in water, the homogeneous mixture formed is called ____________________
(iv) CoSO4 is ______________ whereas CoSO4·7H2O is _______________
(v) NaF(s) contains an ______________ bond whereas H2(g) contains a _________________
bond.
(vi) To remove the water molecules from CuSO4·5H2O we heat the sample of this compound with
a __________________ which has a blue flame and we cool the sample in a
______________________ which contains silica gel.
(vii) The Group 8A (Group 18) elements are collectively known as _____________________
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