Which of the following is NOT true of white dwarfs?

Chemistry

2 answers:

ella [17]3 years ago

8 0

The answer is they are cold because white dwarfs are hot when they form.

liq [111]3 years ago

6 0

Answer:

A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula. Only the hot core of the star remains. ... That means a white dwarf is 200,000 times as dense.

Explanation:

they are cold

they are about the size of Earth

these both are not true

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Describe the charges of the particles in the atom and how charge is distributed within an atom.

trapecia [35]

There are MANY subatomic particles in an atom.
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The electron which has a negative charge.
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3 years ago

What happens to a glass of sugar solution when sugar is added to it?

galina1969 [7]

Answer:

The molarity of the solution increases.

Explanation:

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This means that the answer is the third choice: The molarity of the solution increases.

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7 0

4 years ago

Read 2 more answers

A student heats 10.52 g of sodium hydrogen carbonate in a crucible until the compound completely decomposes to sodium carbonate

saveliy_v [14]

Answer:

$m_{Na_2CO_3}^{theoretical}=6.636gNa_2CO_3$

Explanation:

Hello!

In this case, since the decomposition of sodium hydrogen carbonate is:

$2NaHCO_3(s)\rightarrow Na_2CO_3(s)+H_2O(g)+CO_2(g)$

Thus, since there is a 2:1 mole ratio between the sodium hydrogen carbonate and sodium carbonate, and the molar masses are 84.01 and 105.99 g/mol respectively, we obtain the following theoretical yield:

$m_{Na_2CO_3}^{theoretical}=10.52gNaHCO_3*\frac{1molNaHCO_3}{84.01gNaHCO_3}*\frac{1molNa_2CO_3}{2molNaHCO_3} *\frac{105.99gNa_2CO_3}{1molNa_2CO_3}\\\\ m_{Na_2CO_3}^{theoretical}=6.636gNa_2CO_3$