Answer:
Extractive metallurgy
Explanation:
Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form.
Answer:
d) Make it flexible
Step-by-step explanation:
Raw hides dry out to form a hard material that can decay with an offensive smell when they become wet.
Tanning converts the protein of the raw hide into a stable material that will stay flexible and not decompose when it gets wet.
a) is <em>wrong</em>. The purpose of tanning is to soften the leather.
b) is <em>wrong</em>. You smooth the leather manually with fine sandpaper.
c) is <em>wrong</em>. Tanning does not impart water resistance. It prevents the leather from putrefying when it does get wet.
Answer:
Explanation:
-We convert Ca(OH)₂ grams to moles using its <em>molar mass</em>:
- 31.82 g ÷ 74.093 g/mol = 0.43 mol
-We convert K₂SO₃ moles to grams using its <em>molar mass</em>:
- 3.2 mol * 158.26 g/mol = 506.4 g
-One formula unit of HCl is HCl. We convert molecules to moles using <em>Avogadro's number</em>:
- 7.25x10²³ molecules ÷ 6.023x10²³mol/molecules = 1.20 mol
-At STP, <em>one mol of any gas occupies 22.4 L</em>:
- 46.6 L * 1 mol / 22.4 L = 2.080 mol
1 mol of Silicon = 28.0855 g (in average)
then
1 mol = 6.022*10^23 atoms
then
28.0855/(6.022*10^23) g/atom
4.66381*10^-23 g per atom
Answer:
The differemt isotopes that differ in atomic mass
Explanation: