Answer:
Explanation:
The <em>dimensional analysis</em> helps you by focusing your attention into the units: you must set up the equation starting with the available units and add the factors with the units such that the cancelation of numerators and denominators ends up with the desired units: grams of aluminium in this case.
In this case, you start with a mass of 2.56 grams per penny, which is 
, whose value is $200.00 and want to end with the grams of
Aluminium needed.
Then, you must use the mole ratios derived from the chemical equation in a way that the units lead from grams of copper to grams of aluminium.
The equation is:
From which, the mole ratio between copper and aluminium is:
You must also use the atomic masses of Cu and Al which are 63.5g/mol and 27g/mol respectively.
The equation is:
You can check that afeter multiplying all the factors, the most units will cancel and the final units will be grams of Al.
Parasitic fungi often cause illness and may eventually kill their host. Two common mutualistic relationships involving fungi are mycorrhiza (fungi and plant roots) and lichen (fungi and either cyanobacteria or green algae
The main distinction between
ionic and covalent bonding is that ionic bonding is the complete transfers of
electrons between atoms whereas covalent bonding is the sharing of electrons
between atoms.
Because of the hard structure of diamonds that basically are a <span>comprised of carbon atoms linked closely together in a lattice structure, then the right answer should be b. a cubic lattice</span>
Answer:
Magnesium (
.)
Explanation:
In the Bohr Model of atoms, each "ring" denotes a non-empty main energy shell. The Bohr Model for this atom has three rings, meaning that three of the main energy shells of this atom contain electron(s).
Refer to a copy of the modern periodic table. Elements on the modern periodic table are arranged into rows ("periods") by the number of non-empty main energy shells in each atom.
There are three non-empty main energy shells in the atom in this question. Thus, the element of this atom would belong to the third period (third row) of the modern periodic table.
Examples of alkaline-earth metal elements include Beryllium, Magnesium, Calciums, and a few others. These elements are in IUPAC group 
and are found in the second column from the left of a modern periodic table.
There is only one alkaline-earth metal in each period. The question implied that the element here includes three non-empty main energy shells per atom. That element would thus be in the third period. The alkaline-earth metal of the third period is magnesium. Therefore, the element in this question would be magnesium.
