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Sonbull [250]
3 years ago
12

The pen on seismograph swings freely.

Chemistry
1 answer:
Sever21 [200]3 years ago
7 0
This statment is false, the pen on a seismograph does not swing freely.
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Carbon 14 has a half-life of 5730 years. A geologist has dated a fossil sample, at roughly 28650 years. How much carbon 14 remai
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Explanation:

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5 0
2 years ago
Imagine you had HCl with a concentration of exactly 0.10 mol/dm3. If 0.023 dm3 of a sodium hydroxide solution, NaOH (aq), could
polet [3.4K]

Answer:

Explanation:

Step 1: Calculate the amount of sodium hydroxide in moles

Volume of sodium hydroxide solution = 25.0 ÷ 1,000 = 0.0250 dm3

Rearrange:

Concentration in mol/dm3 =

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Amount of sodium hydroxide = 0.100 × 0.0250

= 0.00250 mol

Step 2: Find the amount of hydrochloric acid in moles

The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

So the mole ratio NaOH:HCl is 1:1

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Concentration in mol/dm3 =

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Mass = relative formula mass × amount

Mass of HCl = 36.5 × 0.125

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So concentration = 4.56 g/dm3

8 0
2 years ago
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