Answer:
The Rutherford atomic model stated that an atom is mostly an empty space that consist of nucleus and electrons, where nucleus is positively charged and electrons are negatively charged.
<em>But Rutherford atomic model missed to add the quantum mechanics or energy level for electrons. Rutherford was unable to make understand the planetary movement of electrons around nucleus and later Bohr's model explained it.</em>
Hence, Rutherford's model of the atom missed to explain the planetary movement of electrons around nucleus.
Mass = 35.0 g
density = 1.036 g/cm³
volume = ?
therefore:
D = m / V
1.036 = 35.0 / V
V = 35.0 / 1.036
V = 33.784 cm³
answer D
Answer:
Explanation:
Your goal here is to figure out the mass of iron and the mass of sulfur present in exactly
100 g
of this compound, which is what you need in order to know the compound's percent composition.
The problem provides you with the mass of iron and with the mass of sulfur present in
27.9 g
of this compound, so you must use this information to scale up your sample from
27.9 g
to
100 g
.
To do that, set up the known composition of the compound as a conversion factor.
To find the number of grams of iron present in
100 g
of compound, set up the conversion factor like this
17.6 g iron
27.9 g compound
You will end up with
100
g compound
⋅
17.6 giron
27.9
g compound
=
63.1 g iron
To find the mass of sulfur present in
100 g
of compound, you can either use a conversion factor set up in a similar manner
100
g compound
⋅
10.3 g sulfur
27.9
g compound
=
36.9 g sulfur
or use the fact that the compound contains only iron and sulfur to say that the mass of sulfur will be equal to
100 g compound
−
63.1 g iron = 36.9 g sulfur
You now know the mass of iron and the mass of sulfur present for every
100 g
of compound, so you can say that the compound has the following percent composition
63.1% iron
36.9% sulfur
Here
%
means per
100 g
of compound.
Answer:
c Example 1 represents a liquid and Example 2 represents a solid.
Explanation:
Example 1: Young children dancing slowly around one another
The young children dancing slowly around one another can be pictured as the flow of liquid. In liquids, the molecules are held about weakly and they slide on top of each other. They are held by weak attractive forces. This is clear picture of a liquid.
Example 2: Newborn babies sitting in their given spots in a crib
This is clear example of a solid. In a solid the molecules are held about a fixed spot. The attractive forces in liquids is very great and the molecules therein do not move about randomly.
