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Find the value of 9^(-1/2)

Find the value of 9 -1/2 . For this question we need to know indices rules. We apply two rules here as the power is negative and because it's a fraction. First, let's tackle the negative power rule. When the...
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Answered by Janifa Y. • Maths tutor
48541 Views

A student places equal masses of limestone rocks into two beakers. However, the student crushes the ones in one of the beakers to make a fine powder. Then, he adds hydrochloric acid to both of them. Which takes longer? Would one of them produce more CO2?

First of all let's think of which one would take longer. The one that would take longer would be the slower of the two reactions, and therefore would have a lower rate of reaction . So now we have to think: ...
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Answered by Yago M. • Chemistry tutor
2615 Views

Why do I sometimes see ところ at the end of verbs?

There are multiple uses of ところ in Japanese. When used in conjugation with a verb in the plain form, it is used to emphasise the time at which something happens. When used with a verb in the present tense, it...
Answered by • Japanese tutor
1574 Views

Find the two points of intersection of the graphs y=x2 and y=x+2.

We know the presence of the quadratic means there must be two solutions for x. We can solve this problem by treating the formulas for the graphs as simultaneous equations. We can substitute in the formula fo...
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Answered by Sareena H. • Maths tutor
9054 Views

What is the difference between ionic and metallic bonding?

Ionic bonds occur between a metal and non-metal. In this type of bonding, the electrons in the outer shell are transferred from the metal to the non-metal. This is to allow the atoms to achieve a full outer ...
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Answered by Sareena H. • Chemistry tutor
3162 Views