« previous next »

Author Question: The two elements silicon and oxygen, taken together, make up about what percent of Earth's crust by ... (Read 54 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?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Living systems such as the human body consist of closely interrelated elements Living systems such as the human body consist of closely interrelated elements
Two oxygen molecules in van der Waals contact Two oxygen molecules in van der Waals contact
Wild chimpanzees make and use simple tools to obtain food, learning tool making from one another. Wild chimpanzees make and use simple tools to obtain food, learning tool making from one another.
Make a note of the reading on the gauge after the first “puff,” which indicates the first ... Make a note of the reading on the gauge after the first “puff,” which indicates the first ...
When viewed from the Earth, Venus subtends an angle of about 1 arcminute (1/60°) when it is at ... When viewed from the Earth, Venus subtends an angle of about 1 arcminute (1/60°) when it is at ...
Major bone (tan) and cartilage (light blue) elements of the human skeleton. Inset shows regions of v Major bone (tan) and cartilage (light blue) elements of the human skeleton. Inset shows regions of v
Video: Skin Cancer

For a complete list of videos, visit our video library