It affects the volume of air you can inhale.
Answer:
The second row elements are called Actinidies . abbreviated as Ac
Explanation:
Answer:
The following statements apply to the general experimental procedure for determining the heat of reaction:
A. Measurements of the temperature of the solution in the calorimeter should be taken at regular intervals for several minutes before the reactant is added.
B. The solution in the calorimeter should not be stirred during the experiment because stirring will slow the reaction
D. Temperature readings need to be taken at regular intervals after the highest temperature reading is observed to determine the rate of heat loss from the calorimeter.
Explanation:
Answer:
Option A is correct. Statements b,c and d are true
Explanation:
Step 1: Data given
Proton = a subatomic particle with a positive electric charge of +1 and a mass slightly less than that of a neutron.
Neutron = a subatomic particle of about the same mass as a proton but without an electric charge
electron = a subatomic particle whose electric charge is negative one elementary charge.
The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom
Step 2: Statements
(a) Protons have a charge of -1.
This is false. Protons have a charge of +1
(b) Neutrons have no charge.
This is true
(c) An electron has negligible mass compared to the mass of a neutron
This is true
(d)Number of proton equals to number of electrons on a stable atom
This is true. A stable atom has a charge of 0. this means the same amount of protons and electrons
Option A is correct. Statements b,c and d are true
