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marta [7]
3 years ago
6

How can i study for a science quiz for monday

Chemistry
1 answer:
Ket [755]3 years ago
8 0
Going to different website and watching different science videos on the unit you are on

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#3. How many liters are in 244 g of Krypton (Kr) gas (83.80 g/mol)?
ValentinkaMS [17]

Explanation:

100 liter because it is measured

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Which group are most stars found in
Luden [163]

Answer:

The White Dwarfs are very hot stars, which are small in size and relatively dim. They are found in the lower left of the H-R Diagram. The Main Sequence is a band of stars, which includes most of the stars, like our Sun. These are usually smaller stars, often dwarf stars.

Explanation:

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3 years ago
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How many atoms of Lead are in a 62.7 g sample of Lead(II) permanganate?
Alexandra [31]

Answer:

\large \boxed {8.48 \times 10^{22}\text{ atoms}}

Explanation:

1 mol of Pb(MnO₄)₂contains 1 mol of Pb atoms.

1. Moles of Pb

\text{Moles of Pb} = \text{62.7 g Pb(MnO$_{4}$)}_{2} \times \dfrac{\text{1 mol Pb(MnO$_{4}$)}_{2}}{\text{445.07 g Pb(MnO$_{4}$)}_{2}}\\\\\times \dfrac{\text{1 mol Pb}}{\text{1 mol  Pb(MnO$_{4}$)}_{2}} = \text{0.1409 mol Pb}

2. Atoms of Pb

\text{Atoms of Pb} = \text{0.1409 mol Pb } \times \dfrac{ 6.022  \times 10^{23}\text{ atoms Pb }}{\text{1 mol Pb }}\\\\= \large \boxed {\mathbf{8.48 \times 10^{22}}\textbf{ atoms Pb }}

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3 years ago
A chemical change occurs whenever
Talja [164]

Answer:

C.

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A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust.

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What name should be used for the ionic compound Ga2(SO4)3
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The above ionic compound is called gallium sulphate
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