Top answers

Suggest reasons why levels of carbon dioxide in the atmosphere have changed over time.

CO 2 levels in the atmosphere could have increased due to deforestation, as there are now less trees to re-absorb this gas. Emissions of CO 2 may also have risen due to the increased burning of fossil fuels,...
SJ
Answered by Sam J. • Geography tutor
2929 Views

Décrivez ce que vous avez fait lors de vos dernières vacances d'été.

Pendant mes dernières vacances d’été, je suis allé rester chez un ami a moi dans le sud de la France. Il n’habite pas loin de Nice, une cité sur la côte, alors nous avons passés plusieurs jours sur la plage....
SJ
Answered by Sam J. • French tutor
7277 Views

How do I expand single brackets?

tt the brafckTo expand any brackets, simple or double the golden rule to remember is you must multiply everything inside the bracket by everything outside the bracket. Let's run through some examples:2(x+1)=...
TD
Answered by Tutor122756 D. • Maths tutor
3489 Views

Given the reaction: H2SO4 + NaOH --> ? + H2O. (a). Work out the salt produced (?) and (b). calculate the pH of the remaining solution when 1.2 g of NaOH and 4.41 g of H2SO4 were added in a 500 ml solution. Of the unreacted H2SO4 95% dissociated.

(a). Firstly, to work out the product, take 2Na + + SO 2 - --> 2 Na 2 SO 4 . (b). To calculate the pH, the equation: pH = -log 10 ([H + ]) must be used. Therefore we need to find the concentration of hydr...
DW
Answered by Dan W. • Chemistry tutor
6710 Views

Explain the difference between constructive and destructive plate boundaries?

Overall, there are 4 types of plate boundaries, with constructive and destructive being opposites. A constructive plate boundary is where two plates are slowly moving away from each other, allowing for magma...
CS
12875 Views