« previous next »

Author Question: The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by ... (Read 101 times)

tatyanajohnson

  • Hero Member
  • *****
  • Posts: 569
on: Jul 28, 2018
The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by mass?
 a. 25
  b. 64
  c. 50
  d. 75

Question 2

If atoms unite by transfer of electrons, they form
 a. an organic compound.
  b. an ionic compound.
  c. a polar molecule.
  d. a covalent compound.


isabelt_18

  • Sr. Member
  • ****
  • Posts: 342
Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

b


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

tatyanajohnson

  • Hero Member
  • *****
  • Posts: 569
Reply #2 on: Jul 28, 2018
Thank you!


isabelt_18

  • Sr. Member
  • ****
  • Posts: 342
Reply #3 on: Jul 28, 2018
Always glad to help...


« previous next »
 

Did you know?

Everyone has one nostril that is larger than the other.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

Two oxygen molecules in van der Waals contact Two oxygen molecules in van der Waals contact
Make your mitochondria proud! Make your mitochondria proud!
Earth’s Revolution Earth’s Revolution
Formation of Continental Crust Formation of Continental Crust
Humans are related to Earth’s other organisms Humans are related to Earth’s other organisms
Daniel's Enterprises has a beta of 1.98 and a growth rate of 12 percent. The stock is ... Daniel's Enterprises has a beta of 1.98 and a growth rate of 12 percent. The stock is ...
Video: T cell receptors

For a complete list of videos, visit our video library