My best guess has to be 1:3
Answer:
296.448 g
Explanation:
Density:
we know that density of an object can be measured by dividing its mass to its volume.
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m= mass
V= volume
Given data:
volume= 1.2 cm x 4.00 cm x 3.20 cm =15.36 cm3
density= 19.3 g/cm3
mass=?
Now we will put the values in the formula,
d=m/v
d x V= m
m = 15.36 cm3 x 19.3 g/cm3
m=296.448 g
so the mass of block of gold is 296.448 g
Some fossils provide clues to the environment and climate of the time the organism lived.
Answer:
2.63×10²² atoms
Explanation:
From the question given above, the following data were obtained:
Mass of calcium (Ca) = 1.75 g
Number of atoms of calcium (Ca) =?
From Avogadro's hypothesis,
1 mole of Ca = 6.02×10²³ atoms
Recall:
1 mole of Ca = 40 g
Thus,
40 g of Ca = 6.02×10²³ atoms
Finally, we shall determine the number atoms in 1.75 g of calcium. This can be obtained as follow:
From Avogadro's hypothesis,
40 g of Ca = 6.02×10²³ atoms
Therefore,
1.75 g of Ca = 1.75 × 6.02×10²³ / 40
1.75 g of Ca = 2.63×10²² atoms
Thus, 1.75 g of Ca contains 2.63×10²² atoms.
When two electrons are added to chlorine has, Cl2, each atom of Cl will receive one electron. Hence, the atoms becomes ions having a negative charge, Cl-
<h3>Ions</h3>
Ions are atoms or group of atoms possessing an electrical charge which may be positive or negative.
Negatively charged ions are formed when atoms accept or gain electrons. The negative charge is because there are more electrons than protons in the atom.
Negatively charged ions are usually formed by non-metals. For example, chlorine gas accepts two electrons to become 2 Cl-
Cl2 + 2e- ----> 2 Cl-
Therefore, when two electrons are added to chlorine has, Cl2, each atom of Cl will receive one electron. Hence, the atoms becomes ions having a negative charge, Cl-
Learn more about negative ions at: brainly.com/question/1046561
