、有意义 ONDARY INTERVENTION PROGRAMME LEARNER WOTES)
MOLE CONCENTRIC CALCULATIONS
cared forward to calculations in the acid and base
section wall
equium. It is important to know this section well
(Revise calculatorular man. Remember chemical calculations need
formulae, substanswer with the correct unit)
The compound, commonly known as baking soda. A recipe requires 1.6 g of
baking soda meter ingredients, to bake a cake.
Calculate the number of moles of NaHCO, used to bake the cake.
How to calculate the number of moles of NaHCO3 used to bake a cake?
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Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

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