Pls post it in english , so that i can understand...
A magnet can attract cobalt and nickel but not aluminum nor copper
Answer:
- <u><em>1.7 × 10³ kg of ore.</em></u>
Explanation:
Call X the amount of aluminum ore mined to produce 1.0 × 10³ kg the aluminum metal.
Then, taking into account the yield of the reaction (82 % = 0.82) and the percent of aluminun in the ore (71% = 0.71), you can write the following equation:
- X × 71% × 82% = 1.0 × 10³ kg
↑ ↑ ↑ ↑
(mass of ore) (% of Al in the ore) (yield) ( Al metal to obtain)
You must just simplify, solve and compute:
- X = 1,000 / (0.71 × 0.82) = 1,000 / 0.5822 = 1,717.6 Kg
Round to two significant figures; 1,700 kg = 1.7 × 10³ kg of ore ← answer.
Answer:
"The sun's energy comes from within the sun itself. The sun generates energy from a process called nuclear fusion"
Explanation:
Google
Hope This helps! (づ ̄3 ̄)づ╭❤~
The correct answer is exactly 750 g.
Since the mass of board is 750 g, the mass of the pile of sawdust after the whole board is ground down is 750 g.
This is according to the Law of conservation of mass. According to this law, matter can neither be created nor destroyed by any physical transformations or chemical reactions. In any chemical reaction the mass of the products is equal to the mass of the reactants.
Here the board undergoes a physical transformations from being a whole board to a pile of sawdust. Thus according to the Law of conservation of mass, the mass of the whole board will be equal to the mass of a pile of sawdust.