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IgorC [24]
3 years ago
7

HELPPP ANSWERS ???? A: 3 B: 2 C: 1 D: 4

Chemistry
2 answers:
mariarad [96]3 years ago
6 0

Answer:

B. 2

Explanation:

We see from the reaction side of the equation that we have 2 Li. That means we need the same number of Li on the products side. Therefore, our only option is 2.

IrinaK [193]3 years ago
4 0

Answer:

b

Explanation:

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Soda pop is carbonated with CO2. Mark puts one bottle of soda pop in the refrigerator and leaves the other out in the hot sunlig
EastWind [94]

Answer:

the soda bottle in the fridge will have more bubbles

Explanation:

3 0
2 years ago
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What happens to the sugar from a sugar cube after it has dissolved in a cup of tea? (Molecule related)​
katovenus [111]

Answer: Sugar is very soluble in water. When you add the solid to the tea the key process is that the solid sugar dissolves in the warm liquid: the solid crystals are broken up into molecules which are every dispersed throughout the existing liquid.

Explanation:

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3 years ago
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Copper has two naturally occurring isotopes. Cu−63 has a mass of 62.939 amu and relative abundance of 69.17%.
fiasKO [112]
The answer is 64.907 amu.

The atomic mass of an element is the average of the atomic masses of its isotopes. The relative abundance of isotopes must be taken into consideration, therefore:
atomic mass of copper = atomic mass of isotope 1 * abundance 1 + atomic mass of isotope 2 * abundance 2

We know:
atomic mass of copper = 63.546 amu
The atomic mass of isotope 1 is: 62.939 amu
The abundance of isotope 1 is: 69.17% = 0.6917
The atomic mass of isotope 1 is: x
The abundance of isotope 2: 100% - 69.17% = 30.83% = 0.3083

Thus:
63.546 amu = 62.939 amu * 0.6917 + x * 0.3083
63.546 <span>amu = 43.535 amu + 0.3083x
</span>⇒ 63.546 amu - 43.535 amu = 0.3083x
⇒ 20.011 amu = 0.3083x
   ⇒ x = 20.011 amu ÷ 0.3083 = 64.907 amu
7 0
3 years ago
1) Which of the following is the best example of a physical change?
never [62]

1 is b and 2 is also b

4 0
3 years ago
How many moles in 5 grams of gold
Ainat [17]
There is 0.02538502095915 Moles in 5 grams of gold.
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3 years ago
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