1. Iron fillings are magnetic, so use a magnet to pull the iron fillings out of the mix.
2. Then you can put the salt and sand mixture into water, since salt is soluble, and the salt will dissolve, leaving you with sand.
Answer:
61.5096 %
Explanation:
Let the amount of gold in the jewelry = x g
Let the amount of silver in the jewelry = y g
Total mass of jewelry = 9.85 g
So,
x + y = 9.85 g .................................1
Density = Mass / Volume
Given that:
Density of gold = 19.3 g/cm³
Thus, volume is:
Volume = Mass / Density = x / 19..3 cm³
Given that:
Density of silver = 10.5 g/cm³
Thus, volume is:
Volume = Mass / Density = y / 10.5 cm³
The total volume of the jewelry = 0.675 cm³
So,
Or,
10.5 x + 19.3 y = 136.78875 ................2
Solving 1 and 2, we get that:
<u>x = 6.0587 g</u>
<u>y = 3.7913 g</u>
So, mass % of gold:
<u>Mass % = (6.0587 / 9.85)×100 = 61.5096 %</u>
Answer:
A molecule is a bunch of atoms combined.
An atom is the smallest part of an element, that you can get without splitting the nucleus of the atom.
Molecules are made of more two or more atoms joined together. The atoms can be same or different elements. A single molecule is the smallest piece of matter you can have without changing its properties.
Explanation:
Answer:
Hope it helped
Explanation:
For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
Answer:
When two people "collide" and one of them is carrying the virus then the other person starts carrying it. This is why we need to social distance so it doesn't spread.
Explanation:
