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mamaluj [8]
3 years ago
12

Is NaOH an acid or base

Chemistry
1 answer:
ExtremeBDS [4]3 years ago
4 0

Answer:

no

Explanation:

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The carbon−14 decay rate of a sample obtained from a young tree is 0.266 disintegration per second per gram of the sample. Anoth
Novosadov [1.4K]

Answer:

  • <u><em>3.30 × 10³ years</em></u>

Explanation:

1) <u>Carbon-14 disintegration rate of a young (alive) tree</u>: 0.266 per second per gram.

2)<u> Carbon-14 disintegration rate of a wood sample prepeared from an object recovered at an archaelogical excavation (dead matter):</u> 0.178 per second per gram.

3) <u>Ratio of decay</u>: A/A₀ = 0.178 / 0.266 = 0.669

4) <u>Half-life equation</u>: A/A₀ = (1/2)ⁿ, where n is the number of half-lives since the object died.

5) <u>Substitute and solve for n</u>:

  • 0.669 = (1/2)ⁿ

nlog(1/2)=log(0.669)\\ \\n=\frac{log(0.669)}{log(1/2)}\\ \\n=0.578

That means that 0.578 half-life has elapsed since the wood with which the object was created was dead matter.

6) <u>Convert number of half-lives to years</u>:

  • 0.578 half-life × 5715 years/half-life = 3,303 years = 3.30 × 10³ years.
5 0
3 years ago
How are organisms classified as Eukarya different from organisms classified as Archaea and Bacteria?
inn [45]

Answer: D

Explanation: The Eukarya differ from the Archea and Bacteria in that their cells are eukaryotic, meaning they contain a membrane enclosed nucleus and other membrane enclosed organelles.

6 0
3 years ago
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Marie Curie named polonium in honor of Poland. 1. True or 2. False
natali 33 [55]
<span>Radium and Polonium were named in honor of Marie Curie.
SO yeh true
Hope this helps!
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7 0
3 years ago
The acceleration of a runner who accelerates from 0 m/s to 3 m/s in 12s
Naily [24]
4 m/s^2


I hope this helps! 
5 0
4 years ago
Tris has a molecular weight of 121 g/mol. How many grams of Tris would you need to make 100 mL of a 100 mM solution of Tris
Zepler [3.9K]

Answer:

1.21 g of Tris

Explanation:

Our solution if made of a solute named Tris

Molecular weight of Tris is 121 g/mol

[Tris] = 100 mM

This is the concentration of solution:

(100 mmoles of Tris in 1 mL of solution) . 1000

Notice that mM = M . 1000  We convert from mM to M

100 mM . 1 M / 1000 mM = 0.1 M

M = molarity (moles of solute in 1 L of solution, or mmoles of solute in 1 mL of solution). Let's determine the mmoles of Tris

0.1 M = mmoles of Tris / 100 mL

mmoles of Tris = 100 mL . 0.1 M → 10 mmoles

We convert mmoles to moles → 10 mmol . 1mol / 1000mmoles = 0.010 mol

And now we determine the mass of solute, by molecular weight

0.010 mol . 121 g /mol = 1.21 g

8 0
3 years ago
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