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elixir [45]
2 years ago
9

CLAIM:Pennies are not all copper.

Chemistry
1 answer:
Zigmanuir [339]2 years ago
5 0

Answer:

Explanation:

Mint produced more than 130 billion pennies. Then, in 1982 the Mint introduced a penny that is 97.6 percent zinc and only 2.4 percent copper with a density of 7.2 g/mL. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8.8 g/mL.

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How are landslides and mudflows similar and how are they different?
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5 0
4 years ago
You have at your disposal 3 1-pound bags of various pure salts that dissolve readily in water. You can add one of the bags to a
Sedaia [141]

Answer:

This question appears incomplete

Explanation:

However, it should be noted that addition of soluble salts generally lowers the freezing point of water hence after the addition, water will no longer freeze at 0°C but lower.

Soluble salts tend to form more ions in water, it is these ions that are responsible for interfering with the hydrogen bonds hence lowering the freezing. Thus, (since each bag are of the same weight) <u>the bag that contains the salt that ionizes more in water will lower the freezing point by the greatest amount</u>.

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6 0
4 years ago
450 nanometers to meters
lys-0071 [83]

Answer: 4.5 x 10e-7

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4 0
3 years ago
To determine the molar mass of an unknown organic acid, HA, a 1.056 g sample is titrated with standardized NaOH. Calculate the m
meriva

Explanation:

Equation for the given reaction is as follows.

     HA(aq) + NaOH(aq) \rightarrow NaA(aq) + H_{2}O(l)

Therefore, moles of NaOH and HA are calculated as follows.

     Moles of NaOH = 0.256 M \times 0.03378 L

                                = 8.64 \times 10^{-3}

                                = 0.00864 mol

     Moles of HA = 0.00864

Also,  moles = \frac{\text{weight}}{\text{molecular weight}}

      Molecular weight = \frac{1.056 g}{0.00864 mol}

                                    = 122.22 g/mol

Thus, we can conclude that molar mass of given unknown organic acid is 122.22 g/mol.

4 0
3 years ago
Two unknown elements react to form a single compound. The compound is shiny and malleable. What would you expect to be true abou
Fed [463]
I believe the answer is B
7 0
3 years ago
Read 2 more answers
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