Answer:
1. 1795, that's when they were also invented
2. a gray crystalline allotropic form of carbon which occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors.
3.The second graphite grading scale is known as the HB scal
4. As the concentration of hydrogen ions in a solution increase, the more acidic the solution becomes. ... Thus, as the hydrogen ion concentration increases hydroxide ion concentration falls, and vice versa.
Answer:
1. Sugar and salt can be hidden in some foods, so work to avoid them.
Explanation:
Since the text is about how sugar and salt can be hidden and it explains how you can detect them, I'm sure this is the main idea of the paragraph.
Answer:
C. it is a visual representation of a group or culture’s beliefs, which can be understood by all people.
Explanation:
Figures have exaggerated proportions that give the sculpture a sense of drama.
