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Setler [38]
3 years ago
10

Name three ways chemists keep track of amounts of substances

Chemistry
1 answer:
podryga [215]3 years ago
4 0
By measuring them, by monitoring them, or by separating them.
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What percentage of the 20.0g sample does sugar (sucrose) represent? Pls include the percentage sign.
Viefleur [7K]

Answer:

42%

Explanation:

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3 years ago
The final volume of the solution is 284 mL. What is the concentration of CuSO4 in the final solution, in mol/L?
DochEvi [55]

Answer:

0.0252mol/L

Explanation:

The following data were obtained obtained from the question:

Volume of solution = 284mL = 284/1000 = 0.284L

Mole of CuSO4 = 7.157 × 10^-3 mol

Molarity =?

Molarity = mole/Volume

Molarity = 7.157x10^-3 /0.284

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3 years ago
30. In a common experiment in the general chemistry laboratory, magnesium metal is heated in air to produce MgO. MgO is a white
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Answer: 2Mg + O2 》 2MgO

3Mg + N2 》Mg3N2

Explanation:

6 0
3 years ago
Given the balanced equation representing a reaction at 101.3 kPa and 298 K:
ser-zykov [4K]
Answer (4)

Endothermic processes: are those in which occurs the absorption of heat.
the change of enthalpy (ΔH) is greater <span>than zero.
</span>
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8 0
3 years ago
Write a balanced chemical equation showing how each metal oxide reacts with HCl. SrO Na2O Li2O BaO
Agata [3.3K]

Answer:

See below  

Explanation:

Each metal oxide reacts with HCl to form water and the metal chloride

\rm SrO + 2HCl \longrightarrow SrCl_{2} + H_{2}O\\\\Na_{2}O + 2HCl \longrightarrow 2NaCl + H_{2}O\\\\Li_{2}O + 2HCl \longrightarrow 2LiCl + H_{2}O\\\\BaO + 2HCl \longrightarrow BaCl_{2} + H_{2}O

6 0
3 years ago
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