Answer:
5.0g/cm^3
Explanation:
Since we have the mass of the wood (25.0g) and the volume of the wood (5.0cm^3), can use the formula for density to answer this question.
Density=mass/density
Density=25.0g/5.0cm^3
Density=5.0g/cm^3
Therefore, the density of the piece of wood is 5.0g/cm^3.
I hope this helps!
I believe the answer is C. an unstable nucleus emits radiation and is transformed into the nucleus of one or more elements. i hope this helps!
Answer:
Conservation of mass
Explanation:
The Conservation of mass states that.
Answer:
Half life of phosphorous-32 = 14 days
Explanation:
Given data:
Total mass of phosphorous-32 = 2.0 g
After 42 days mass left = 0.25 g
Half life of phosphorous-32 = ?
Solution:
First of all we will calculate the number of half lives passed.
At time zero = 2.0 g
At first half life = 2.0 g/2 = 1.0 g
At 2nd half life = 1.0 g/2 = 0.5 g
At 3rd half life = 0.5 g/2 = 0.25 g
Half life:
Half life = T elapsed / half lives
Half life = 42 days/ 3
Half life = 14 days
Answer:
The correct option is option E
Addition to the carbonyl by a nucleophile is followed by loss of the leaving group.
Explanation:
Substitution reaction that involves nucleophile and acyl group is called nucleophilic acyl substitution reaction.
Generally alcohol, amine or enolate group act as nuceophile. The nucleophile displaces the acyl group of acyl haide, anhydride or ester.
Mechanism of acyl substitution reaction
First step is the addition of nucleophile to the carbonyl carbon results in the formation of a tetrahedral derivatives.
Second step is the removal of leaving group
Hence, the correct option is option E
