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vampirchik [111]
3 years ago
9

How many significant figures does 0.070 have?

Chemistry
1 answer:
Aleonysh [2.5K]3 years ago
4 0
For example, 3.070<span> has </span>four significant figures<span>; 0.070 has </span>two significant figures<span>. 4. Zeros to the right of the last nonzero digit, but to the left of the decimal, as in the num-</span>
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4. Why is radiocarbon measurement useless when trying to measure things that died
julsineya [31]

Answer:

Radiocarbon measurement or radiocarbon dating is a method that is used to measure the age of the carbon-based material in living organisms.

Radiocarbon dating is able to estimate age of fossils that are younger than 50,000 years and unable to measure things that died longer than 200,000 years ago because fossils that are too old do not contain carbon or carbon get vanished from too old fossils of organisms. Some of the fossils also get contaminated due to environmental conditions and during teh collection or preservation process.

Thus,  radiocarbon measurement is useless when trying to measure most rocks older than 50,000 years.

4 0
3 years ago
A thin sheet of metal foil has a total area of 23.28in^2. What is the thickness (in mm) of this sheet. (mass=20.675g density=2.7
stira [4]

Answer:

Mass x Volume = density

Explanation:

6 0
3 years ago
Which Act is the set of laws signed by former President Nixon that helps keep water clean in the United States?
otez555 [7]

Clean Water Act

Explanation:

The Clean Water Act in 1972 was a set of laws signed by former President Nixon that helps to keep water clean in the United States.

  • The act sets a safe limit for the amount and kind of pollutants that can be released into the water that won't contaminate it.
  • The acts charged the Environmental Protection Agency(EPA) to set a safe limit for nature and amount of pollutants that can be released into the water.
  • This act is one of the several environmental polices in the United States that ensures a safe drinking water is available.

learn more:

Pollution brainly.com/question/10743354

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5 0
4 years ago
A piece of metal weighing 267.0 g is placed in a graduated cylinder containing 229.0 mL of water. The volume of water now reads
densk [106]

Answer:

9.368g/mL

Explanation:

The density is defined as the mass of a compound in a determined volume.

Based on Archimedes' law, the volume of the piece of metal is the difference between the volume of the water + the inmersed piece - the original volume of water. That is:

<em>Volume of the metal:</em>

257.5mL - 229.0mL = 28.5mL

As the mass of the metal is 267.0g; its density is:

<em>Density:</em>

267.0g / 28.5mL =

<h3>9.368g/mL</h3>
5 0
3 years ago
If 25.0 mL of 0.100 M Ca(OH)2 is titrated with 0.200 M HNO3, what volume of nitric acid is required to neutralize the base?
Troyanec [42]

Answer:

25 mL

Explanation:

The reaction that takes place is:

  • Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O

First we<u> calculate how many Ca(OH)₂ moles</u> were spent in the titration:

  • 25.0 mL * 0.100 M = 2.5 mmol Ca(OH)₂

Then we <u>convert Ca(OH)₂ moles into HNO₃ moles</u>, using the <em>stoichiometric ratio</em>:

  • 2.5 mmol Ca(OH)₂ * \frac{2mmolHNO_3}{1mmolCa(OH)_2} = 5.0 mmol HNO₃

Finally we <u>calculate the volume of required nitric acid solution</u>, using the <em>concentration</em>:

  • 5.0 mmol ÷ 0.200 mmol/mL = 25 mL
7 0
3 years ago
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