Tungsten Carbide is a compound of the elements tungsten (symbol W) and carbon (C). It is extremely hard and so has many important uses in industry, the military and in sports as well as in some jewelry. The main uses of tungsten carbide are in machine tools. It is cheaper than diamond and is also … Read more

Amines are organic chemicals containing nitrogen. Nitrogen can form a covalent (electron sharing) bond with three other atoms. When all three side groups are hydrogen the compound is called ammonia (NH3). When one or more of the hydrogens are replaced by organic groups (containing carbon) they are called amines. There are three main types of … Read more

Chromatography is a method of separating the elements of a mixture. It is used in chemistry to identify the constituents of mixtures of chemicals. All chromatography involves certain elements. First is the chemical mixture itself, the analyte. Then there is a "mobile phase", which carries the analyte along. Finally there is the "stationary phase" through … Read more

Scientifically, the word turtle is the inclusive word that includes different types of turtles and tortoises. So all tortoises are technically a type of turtle. More commonly the term turtle refers to those types which live in the water, such as pond turtles, sea turtles and terrapins while tortoises live on the land with legs … Read more

Motorcycles and cars have similar engines and so will travel from one place to another at about the same speed. Why would I choose one over the other? Cars are larger, you can take your whole family together in one vehicle. If, however, only one person is travelling, it is more efficient to use a … Read more

Oil and gas a called fossil fuels. They were formed by the sedimentation and fossilization of plants and animals. When plants near the sea, or tiny sea creatures died, they fell to the bottom of the sea or lake and formed a layer of organic matter. These layers were then covered by layers of sand … Read more

The contact process produces sulphuric acid in three stages. First sulphur dioxide is produced, either by burning sulphur in air or by heating sulphide ores like pyrites in excess oxygen. Second the sulphur dioxide is converted into sulphur trioxide. This is done at a temperature of four hundred to four hundred and fifty degrees Celsius, … Read more

Hydrogen gas is a colourless, odourless gas. It has a melting point of -259 C and a boiling point of 252.9 C, which means that it is gaseous at room temperature and pressure. Hydrogen is the lightest element. It is also the most abundant element in the universe. It has an atomic number of 1, … Read more

To conduct an experiment there are various important steps. First you need to identify what you want to study in the experiment. This may be a problem you have come up against, an ongoing interest or something assigned to you by someone else. Second, you need to find out what others have done. This will … Read more

Calcium is a not metal. It cannot be said to dissolve in the most common solvent - water. When Calcium is added to water a reaction occurs which is not solution, it is called oxidation. Hydrogen gas is given off and calcium atoms become ions, charged particles. The resulting solution is called calcium hydroxide solution. … Read more

　　Coffee is addictive because it contains the chemical Caffeine. 　　Caffeine is contained in coffee beans, tea leaves and cocoa beans and so is present in coffee, tea, chocolate and it is also added to various soft drinks. 　　 　　Many people regularly experience the feeling of a real need for a cup of coffee or bar … Read more

The Anglican Church is also known as the Church of England or the Episcopal Church. There are two main differences between the Anglican Church and Baptist Churches. First they differ on Church government, or "who makes the decisions?". Secondly they differ on the mode and subjects of baptism or "who should be baptised and … Read more

Coffee, tea and cocoa beans all contain the chemical caffeine. This chemical has a similar structure to a chemical in the human brain called adenosine. Adenosine is released by the body when it is tired. It attaches to specific sites in the brain to slow down nerve cell activity to bring on drowsiness and … Read more

The verse is in Romans chapter 6 verse 23 and says: "The wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord." The part quoted in the question emphasizes the negative aspect of the situation, whereas the whole verse is beautifully balanced. In his epistle to … Read more

Steel is an alloy of iron with carbon and sometimes other constituents like manganese and molybdenum. To form stainless steel, chromium must be added in a proportion of 12-26%. This addition of chromium metal reduces the danger of oxidation or corrosion of the steel. This works because chromium reacts with the oxygen air to … Read more

Earth is unique because it is the only planet in the Solar System which supports organic life. It is unique in this way because of the distance to the sun and the constituents of the atmosphere. If the earth were any closer to the sun it would be too hot and all organic life … Read more

Potassium Permanganate is a strong oxidising agent. This is because the manganese is in oxidation state +7 and is readily reduced to Mn(V) or Mn(III). It is a deep purple colour which can cause stains on many surfaces. I have found that the best thing to remove permanganate stains is hydrogen peroxide, which simply reduces … Read more

An important point to remember is that the Christian teaching is that salvation is not gained by doing good works. Salvation is received by grace (a free gift of God) through faith or trust in Jesus and his atoning death on a cross. So "a good life" does not save you, according to the … Read more

The discovery of Carbon has happened in three phases. First, since prehistoric times man has used charcoal, which is amorphous carbon produced by burning wood in a limited quantity of air. Charcoal has been used as a fuel for many thousands of years. Second, the discovery of the fact that carbon is an element existing … Read more

Perhaps the most common use of the word "catalytic" now is in "catalytic converter" which is attached to the exhaust pipe of a car to reduce the harmful emissions from the combustion of petrol in the car engine. A catalyst is a substance which speeds up a chemical reaction without being changed itself. Sometimes the … Read more