Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
Ca3N2+3MgCl2 (double replacement)
Answer:
3.5 mol
Explanation:
Step 1: Given data
Moles of HCl: 7.0 mol
Step 2: Write the balanced equation
Fe(s) + 2 HCl(aq) ⇒ FeCl₂(aq) + H₂(g)
Step 3: Calculate the moles of H₂ gas produced from 7.0 moles of HCl
According to the balanced equation, the molar ratio of HCl to H₂ is 2:1.
7.0 mol HCl × 1 mol H₂/2 mol HCl = 3.5 mol H₂
Answer:
An aqueous solution in the blood that helps to regulate pH is called buffer solution.
Explanation:
Buffer solution is a specific type of solution which able to resist the pH change when small amount of acid or base is added to it.There are various buffer system present inside our body that helps to regulate the pH of our body.
The clinical contidition in which the blood pH is above is 7.45 is called alkalosis it can be overcome by addition of required amount of acid or H+ ion to neutralize to excess base.
For example during alkalosis the CO2 that is produced during cellular respiration reacts with water to generate carbonic acid(H2CO3) which will help to neutralize the excess base to maintain the normal pH of the blood.
Answer:
The argument about the chemical and physical changes in the energy is correct.
This is so because when a log is burnt, the chemical change occurs as wood releases energy in the form of carbon dioxide are formed which is irreversible while the changes in energy of movement of the pendulum is a physical change as its potential energy converts to kinetic and kinetic energy again converts to the potential which is a reversible process.
Hence, the argument saying the changes in energy occurring on a pendulum and log is right.
