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SVEN [57.7K]
4 years ago
6

How is a pure substance different from a mixture

Chemistry
1 answer:
Neko [114]4 years ago
6 0
Pure substance is only one type of atom or molecule. A mixture is a bunch of different atoms together
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Water exists in three different states (solid, liquid, gas) at different temperatures. According to the graph water exists in wh
Brilliant_brown [7]

Answer: Water

Explanation: I don't see any graph attached, but water has a boiling point of 100C, which is where it would become gas, or water vapor. 0C is the freezing point of water, where it would become ice. Since 50C is in the middle, it would be considered liquid.

3 0
4 years ago
Zinc Mass If a 1.85 g mass of zinc produces 475 mL of gas and your balloon weighs 0.580 g and the room temperature is 21.5°C. Ca
Alexus [3.1K]
The weight of the balloon is irrelevant because it is the gas that lifts it in the air. We are already given with the required volume, so we use this instead. The atomic weight of zinc is 65.38 g/mol. Assuming ideal gas behavior,

PV=nRT
P(475 mL)(1 L/1000 mL) = (1.85/65.38)(0.0821 L·atm/mol·K)(21.5 + 273)
P = 1.44 atm

Then, we use this pressure and the volume to find the moles of zinc.

(1.44 atm)(475 mL+1 mL)(1 L/1000 mL) = n(0.0821 L·atm/mol·K)(21.5 + 273)
Solving for n,
<em>n = 0.02836 moles of zinc</em>
3 0
4 years ago
Convert the volume 27.8 L to the unit m3.
kolbaska11 [484]

Answer:

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Explanation:

hoped I helped

4 0
3 years ago
What is responsible for the whistling sound that often accompanies fireworks?
liq [111]
The crackling sound Is mainly to do with chemistry, The fireworks are filled with lead oxide, which turns into lead atoms as the firework explodes and heat up—— whistling sounds, the whistle is down to the tube being narrow one, thus rockets make a whistling noise
6 0
3 years ago
Many metals react with oxygen gas to form the metal oxide. for example, calcium reacts as follows. 2 ca(s) + o2(g) → 2 cao(s) yo
aniked [119]
<span>(a) Assuming the amount of O2(g) is not limiting the reaction, a mass of 4.23g of Ca(s) will produce an equal mass of CaO(s), hence it will produce 4.23g of CaO(s). According to their respective molar masses, we have the following CaO molar mass : Molar mass of Ca + Molar mass of O = 40.1 + 16 = 56.1 g/mol 4.23g of Ca will then produce : 4.23 / 56.1 = 0,07540107 mol of CaO. (b) With the same reasonment as above, and assuming the amount of Ca is not limiting, we have : 2.87g of O2 will produce : 2.87 / 56.1 = 0,051158645 mol of CaO. (c) From (a) and (b) answers, we can conclude that the reactant that produces less mol of CaO is limiting the reaction. Hence following the given masses, O2 is the limiting reactant. (d) Knowing the molar mass of CaO is 56.1 g/mol and knowing that O2 is the limiting reactant, we also know the reaction can produce a maximum of 0,051158645 mol of CaO can be produced. So we can conclude we will produce : 56.1 * 0,051158645 = 2.87g of CaO.</span>
8 0
4 years ago
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