Answer:
Salt is the pure substance out of them all.
which substance has a giant covalent structure and contains atoms of more than one elements?
Explanation:
answer:methane
Answer:
See explanation
Explanation:
Echo is the reflection of sound waves. Recall that ultrasound are also sound waves of high frequency.
When ultra sound meets an obstacle such as a bone, it is reflected backwards and gives rise to an echo back in the transducer.
Since ultrasound is high frequency sound wave wave; It does not passes through bone due to the high density of the bone, the data required may now be collected.
Answer: 1.90x10²³ atoms of O
Explanation: First convert the mass of O into moles:
5.06 g O x 1 mole O / 16 g O
= 0.32 moles O
Next use Avogadro's Number to find the number of atoms of O
0.32 moles O x 6.022x10²³ atoms O / 1 mole O
= 1.90x10²³ atoms O
