1. Which of the following has a positive charge? 2. How many electrons are there in the valence shell of the O2– ion? 3. What is the formula of the compound formed between magnesium and oxygen? 4. Which one of the following statements concerning elements in the Periodic Table is correct? 5. Which one of the following species has the same electron configuration as Al3+ cation?
1) When a little quantity of ethanol (b. pt 78 0C) was dissolved in large quantity of water (b.pt 100 0C) , the most likely boiling point of the mixture is between A. 89-90 0C B. 103-1070C C. 78-100 0C D. 80-96 0C 2) Chromatography is a method of separation based on A. the different speed of the components B. the ability of the components to react with each other C. the ability of the components to repel each other D. the absorption of the components into each other 3) A compound on analysis ...
1. Which of the following has a positive charge? (A) proton (B) neutron (C) anion (D) electron ANS = A 2. How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 ANS = B 3. What is the formula of the compound formed between magnesium and oxygen? A MgO B Mg2O2 C Mg2O3 D MgO2 ANS = A 3. Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost o...
- Is where different races and ethnic groups live together each maintaining its custom - The nation has a unitarian undertone
Elements and Periodicity Group (Gp) I Elements Group II Elements Group III Elements Aluminium and Beryllium Rel
Group Trends The Anomalous Nature of Nitrogen Occurance General Properties and Structures of the Elements Hydrides
1. Which of the following has a positive charge? (A) proton (B) neutron (C) anion (D) electron ANS = A 2. How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 ANS = B 3. What is the formula of the compound formed between magnesium and oxygen? A MgO B Mg2O2 C Mg2O3...
What is the shape of a molecule of CCl4? A. Pyramid B. tetrahedral C. Trigonal planar D. linear ANSWER: B Which of the following increases as boiling water changes to steam? A. Temperature of the system B. degree of disorder of the system C. number of molecules D. Activation energy ANSWER: B Which of the following has a positive charge? A. proton B. neutron C. anion D. electron ANSWER: A Which of the responses contains all the statements that are consistent with the Bohr theory ...
1) When a little quantity of ethanol (b. pt 78 0C) was dissolved in large quantity of water (b.pt 100 0C) , the most likely boiling point of the mixture is between A. 89-90 0C B. 103-1070C C. 78-100 0C D. 80-96 0C 2) Chromatography is a method of separation based on A. the different speed of the components B. the ability of the components to react with each other C. the ability of the components to repel each other D. the absorption of the components into each other 3) A compound on analysis ...
1. Which of the following has a positive charge? (A) proton (B) neutron (C) anion (D) electron ANS = A 2. How many electrons are there in the valence shell of the O2–ion? A 2 B 8 C 10 D 16 3. What is the formula of the compound formed between magnesium and oxygen? A MgO B Mg2O2 C Mg2O3 D MgO2 3. Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electr...
ATOMIC THEORY AND NATURE OF ATOMS Chemistry studies the composition of matter and the changes it undergoes. Matter has been defined as anything that has weight and can occupy space. All materials are made up of matter. For centuries, philosopher, chemist and physicist tried to answer the question of what matter was made up of using a variety of experiments and observations. 1.1 THE EARLY IDEAS OF THE ATOM In 440BC a Greek philosopher named Democritus came up with a conceived idea that matter...
The elements are found in various state of matter and define the independent state of constituents of atoms, ions and simple substances and compounds. Isotopes with the same atomic number belong to the same elements. When elements are classified into groups according to the similarities of their properties as atoms or compounds the periodic table of the elements emerges.
CHAPTER1 ATOMIC THEORY AND NATURE OF ATOMS Chemistry studies the composition of matter and the changes it undergoes. Matter has been defined as anything that has weight and can occupy space. All materials are made up of matter. For centuries, philosopher, chemist and physicist tried to answer the question of what matter was made up of using a variety of experiments and observations. 1.1 THE EARLY IDEAS OF THE ATOM In 440BC a Greek philosopher named Democritus came up with a conceived idea...
Sources of Organic Compounds • The leading sources are i) Coal is formed from wood millions of years ago through the following coalification stages: wood peat lignite subbituminous coal bituminous coal anthracite coal ii) Petroleum (crude oil) and Natural gas – organic compounds can be obtained from petroleum (crude oil) which contains mainly saturated, unsaturated and aromatic hydrocarbons. Solvent Extraction • Coal is extracted by digestion with solvents such as tetracloromethane,...
However large the group concerned one of its many possible arrangements can still be designated by this simple system. The prefix n is used to designate any alkaline group in which all carbons form a single continuous chain and in which the point of attachment is very end carbon.