Answer:
Basalt forms when lava cools quickly at the surface. This quick cooling rate results in very small mineral grains. Pumice is formed when volcanoes erupt explosively. It comes from the same kind of magma which would form granite or rhyolite, that is, a magma that contains lots of silica (quartz). Magma with lots of silica is usually thick and sticky
Explanation:
Answer:
when water is put into a freezer it will freeze like an ice at 0° celcius
Convection currents can happen in liquids and gases. For example when air is heated it becomes less dense and rises. This means that cooler more dense air comes down and is also heated rising up above more cooler air etc. This creates a convection current.
Here is a diagram of a hot water tank heater:
(sorry it isn't that great I did it myself just now)
Answer:
E
Explanation:
So this question tests your understanding of mole:mole ratios.
So looking at the equation we see for every 3 O2 there's 4 NH3, we can even word it like for every 4 mol of NH3 that reacts you need 3 moles of O2. This gives us the mole:mole (mole to mole) ratio of 3 mol O2/ 4 mol NH3.
Now since you have 3.5 moles of NH3 you can use the ratio from above to convert it to O2 by simply 3.5molNH3 * 3mol O2/4mol NH3 ------> 2.625mol O2
Answer:
Explanation:
5 g Mg 1 mole Mg
* ___________ = 0.208333 moles Mg
24 grams Mg
24 is from the periodic table