Top answers

Why does the reactivity of group 1 elements increase as you go down the group?

Group 1 metals all have one electron in their outer shell. When they react they form positive metal ions by losing this electron. Since there is only one electron to lose, group 1 metals are all extrememely ...
PH
30672 Views

How and why does an increase in temperature effect the rate of an enzyme substrate reaction?

As temperature increases up to the optimal temperature for the enzyme, the rate of reaction will increase at a steady rate because the kinetic energy of the enzyme and substrate molecules increases, so there...
ES
Answered by Edward S. • Biology tutor
3631 Views

If Tom flips a coin 3 times, what is the probability the result are heads, heads, heads, or tails,heads, tails? (assuming we have a fair coin)

This question can be solved using a tree diagram. First we need to map out the two possible outcomes from the question: H=heads T= tails. The first scenario is HHH, as the probability of H each time is 1/2 w...
RB
Answered by Ross B. • Maths tutor
5039 Views

When to use the preterite or imperfect tense?

Knowing when to use the preterite or imperfect tense when expressing a past action is one of the trickiest aspects of spanish grammar and can cause confusion for any level of spanish speaker. I always like t...
HS
Answered by Harrison S. • Spanish tutor
2822 Views

How do I use the simple past tense in German and when should I use it?

The two main past tenses in German are the simple past and the present perfect. The simple past uses just one word, for example 'ich ging', while the present perfect uses two words, for example 'ich bin gega...
RW
Answered by Rishabh W. • German tutor
5671 Views