Answer:
A
Explanation:
Conductors allow for charge transfer through the free movement of electrons. In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule. ... The insulator serves as a handle for moving the conductor around on top of a lab table
The temperature for the reaction is calculated as follows
delta H/ delta S
delta H=-70 Kj
delta S =-0.300 kj/k
temperature is therefore = -70kj/-0.300kj/k =233.33 K
Answer:
The respective figure with label and targets is missing but yet the definitions and stability considerations can help you, so I explain them below.
Explanation:
Remember these definitions:
- Atomic number = number of protons
- Mass number = number of protons + number of neutrons
Hence,
- When one proton is added, both atomic number and mass number increase by one.
- When one neutron is added, atomic number remains the same, but mass number increase.
The neutrons provide stability to the nucleus of the atom by compensating the electrostatic repulsion force that arise from the fact that positive charges are forced to be so close in the nucleus.
Since the more protons are added to the nucleus the stronger the repulsive force inside the nucleus are, as the atomic number increase the neutron number must increase too.
For the ligther elements (lower atomic and mass numbers) the ratio of neutrons to protons is very close to 1.
For heavier elements (greater atomic and mass numbers) the ratio of neutrons to protons increase: proportionally more neutrons are needed to provide stability to the nucleus.
Chemical change...................................
<span>Although two centuries old, Dalton's atomic theory remains valid in modern chemical thought. 1) All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms.</span>