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Chemistry Tuition Singapore A Level H2 H1 Chemistry Tuition – Solubility   Which one of the following best explains why barium hydroxide has a higher solubility than magnesium hydroxide? A      The hydroxide ion is a very small anion. B      The charge density of barium ions is smaller than that of magnesium ions. C      The hydration of barium ions is more exothermic than that of magnesium ions. D      The lattice energy of barium hydroxide is less exothermic than that of magnesium hydroxide. Answer (D)   Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Chemistry Tuition A level H2 H1 Chemistry Tuition Singapore.  

Math Tuition Singapore O Level Additional Math Tuition – Equation of line and Stationary Point     Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Additional Math Tuition O level N Level NA Level Maths Tuition Singapore.  

Maths Tuition Singapore O level Elementary Math Tuition – Forming and Solving Quadratic Equation     Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Math Tuition O level N Level NA Level Maths Tuition Singapore.    

Biology Tuition Singapore O Level Biology Tuition – Transport in Flowering Plants Common Misconception   Misconception 1 Xylem vessels have lignified walls and are often referred to as impermeable Correct Concept 1 Xylem vessels cannot be impermeable or else nothing can pass through them. The lignin exists only as spiral rings. It is not coated all over the walls. For example, the pits of the walls are not lignified and substances can pass through them. Lignin is only present to increase the rigidity of the walls and provide mechanical support to them, but not to change their permeability   Misconception 2 Both xylem vessels and phloem sieve tubes are made of dead cells Correct Concept 1 Only xylem vessels are made of dead cells. Mature sieve tube elements are living cells ...

Physics Tuition Singapore O level Physics Tuition – Kinetic Model of Matter Common Misconception   Misconception 1 Gases are compressible because their particles are soft and flexible but solids are incompressible because their particles are hard and inflexible. Correct Conception 1 In the kinetic theory of matter, we assume the particles are hard and have a fixed shape, even for gases. Gases are compressed purely by reducing the space between their particles, but the volume of each particle does not change   Misconception 2. In the Brownian motion experiment,  we can see air particles colliding with the smoke particles Correct Conception 2 In the Brownian motion experiment, we cannot see air particles. We conclude that air particles collide with  the smoke particles from t ...