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laila [671]
3 years ago
8

When the Moon moves between the Sun and Earth and casts a shadow on Earth's surface, there is a(n)

Chemistry
1 answer:
allochka39001 [22]3 years ago
5 0
Hi , the answer is D because the moon is blocking the sun s rays .
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Arrange the following element, lithium, potassium, carbon and fluorine in increasing ionization energy
Juli2301 [7.4K]

Answer:

flourine(1681),carbon(1086),lithium(520) and potassium(419)

as we can see that the ionization energy of flourine is the highest than carbon than lithium and than potassium

Explanation:

i hope it will help you

4 0
3 years ago
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Use the reaction given below to solve the problem that follows: Calculate the mass in grams of aluminum oxide produced by the re
bearhunter [10]

Answer:  28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}   

\text{Moles of} Al=\frac{15.0g}{27g/mol}=0.556moles

The balanced chemical equuation is:

4Al+3O_2\rightarrow 2Al_2O_3  

According to stoichiometry :

4 moles of Al produce == 2 moles of Al_2O_3

Thus 0.556 moles of Al will produce=\frac{2}{4}\times 0.556=0.278moles  of Al_2O_3

Mass of Al_2O_3=moles\times {\text {Molar mass}}=0.278moles\times 102g/mol=28.4g

Thus 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal.

7 0
3 years ago
Which of the following is most likely to be covalent?<br> MgO <br> CO <br> CaO <br> BaO
Kisachek [45]

Answer:

CaO

Explanation:

CaO is the only compound that is a non-metal and a non-metal. The rest of the compounds are ionic, or metal and non-metal.

8 0
3 years ago
What is the density of CO gas if 0.196 occupies a volume of 100 no
shusha [124]
The density of CO gas if 0.196g occupies a volume of 100mL is0.00196g<span>mL or 0.00196 grams per milliliter</span>
3 0
3 years ago
Look at the diagram below. What type of nuclear decay is shown?
SSSSS [86.1K]

Answer: Alpha

Explanation: think so

5 0
3 years ago
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