D, an infrared sensor emits and detects heat by an object.
Answer:
10 N
Explanation:
The pair of 5 N is pressing on 1 side of the square
Answer:
11 atoms
Explanation:
The formula for lead(II) bicarbonate is: Pb(HCO3)2.
Atoms in Pb(HCO3)2:
Pb=1, H=1×2, C=1×2, O=3×2
1+1×2+1×2+3×2
=1+2+2+6
=11 atoms
Answer:
wind and solar are continuously renewable and fossil fuels take millions of years to form
Explanation:
Answer:
,
Explanation:
Hydrocarbons are compounds which only consist of hydrogen atoms and carbon atoms. The presence of any other atom, such as oxygen, any halogen, nitrogen or sulfur, would not let us classify a compound as hydrocarbon.
Regardless of the number of atoms present in the structure, all we need to identify a hydrocarbon is just to make sure that it contains merely carbon and hydrogen atoms.
Notice that the first compound only consists of C and H atoms, so it is a hydrocarbon, just as compound 2.
The third and the fourth compounds have oxygen in them, so they are not hydrocarbons, as they don't have only C and H atoms in them.