Everyday Science – Chemistry

For the lat _____ years chemistry has been essential to the development of mankind.

Most of the familiar products around us depend on the _____ industry.

In about ______ John Dalton realized that all matter is composed of relatively few elements.

Who proved that burning is the chemical combination of the combustible material with then oxygen of the air ?

Which theory says that all matter is composed of atoms which give characteristic properties to matter ?

An atom can be divided into ______ smaller particles.

The number of protons is called.

Name a naturally occurring radioactive gas.

The path that on electron makes around a nucleus is called.

Which water does not readily from lather with soap and causes curdling of soap ?

Which water is similar to ordinary water and also uses in atomic reactors?

Which of the following is not an alloy ?

Chlorine is a poisonous greenish yellow gas with a pungent odour but it has lot of uses, Where it is not used ?

Atoms unite together to form molecules and compounds by means of.

There are _____ kinds of chemical bonds.

Which food contains small amounts of caffeine ?

Which gas was first discovered on the Sun and later on the Earth ?

Name the phenomenon in which the same number and types of atoms may join together in different molecular arrangements.

Decomposition of water into oxygen and Hydrogen is a/an _______ reaction.

Oxidation reaction is that in which ______ is added to an element or compound.

During the 18th and 19th century ,scientists continued preparing lists of elements based on their.

Who developed the periodic table without knowing about the parts of the atoms ?

The electrons in each element are characterized by ______ different quantum numbers.

Name the first element of the periodic table.

Hydrogen is only the _____ most common element.

There are _____ alkali metals.

Copper,silver and gold are called ____ metals.

18-carat gold is three-fourth gold and one-forth other metals Pure gold is.

Which metal is used in fluorescent tubes,ammunition and thermometers ?

Which metal is used in making paint pigments soaps, skin ointments, cosmetics and various plastics ?

Name the element which has maximum number of naturally occurring isotopes.

The composition of the Sun can determined by analyzing its spectrum. The spectrum of the Sun is.

Carbon makes up less than ______ percent of the Earth,s crust.

Which element can be found pure in nature in three forms as diamonds as graphite and as amorphous carbon?

Since _____ synthetic diamonds have been made industrially.

Which metal is used in making electrodes for dry batteries and crucibles for melting metals ?

_____ is a complex chain of processes in Which carbon compounds circulate among air,water living organisms and minerals.

Which gas is used in refrigerators ?

Which gas is used by the green plants in the process of photosynthesis to synthesize sugar or energy rich organic compounds ?

Lakium is present in the largest amount in a human body Name the element which is present in the smallest amount.

The process in which a solid turns to a vapour without passing through an intermediate liquid state is.

______ is a hard dark grey non-metallic element abundant in the crust of the Earth.

How many known natural silicates are in the world ?

Elements which do not react with other elements have their outermost shell.

Which gas is used in preparing soft drinks ?

Which gas makes up approximately 78 percent by volume of the Earth,s atmosphere ?

Nitrogen makes up about _____ percent of animals and vegetable proteins.

When animals and plants die,bacteria release nitrogen from their dead bodies in the form of.

Of 109 known elements,_______ are metals.

Urea contains nitrogen.

The experimental relationship between a reaction rate and the concentration of the reactions is known as.

Which gas is used in fire extinguishers ?

The mixture of two or more metals,combined in order to produce a material with more useful properties than any of the components individually is called.

Bronze has been in use since 3500 B.C Currently bronze contains about 75 percent copper and 25 percent.

Which metal is very abundant throughout the Earth,s crust and the most commonly used structural metal?

The building blocks of proteins are called.

Which is the most purest form of iron ?

Ozone is found in its highest concentration at a height of _______ kilometers.

Which gas makes about 23 percent by weight and 21 percent by volume of the atmosphere ?

______ is a synthetic polymer made from coal,water limestone or other similar basic raw materials.

_______ are found in the form of liquids or solids.

Any organism which is harmful or destructive for human beings,crops or useful plants is called.

Properties of gases and liquids are.

A solution is a.

Which is used in closed spacies to kill bacteria and other micro-organisms ?

Organic compouds are widely distributed in nature in various forms Name the most abundant organic compound in the world.

Which metal is highly malleable ductile ?

Merbicides are used against.

Dead plant material,animal dung, manure rock phosphate and chile saltpeter are.

Nitrogen,phosphorous and potassium are.

_____ fertilizers contain all the major ingredients required for the growth of plants.

Ceramics is a _____ word which means potter,s clay.

The phenomenon of cooling and sudden expansion of gases is called.

The process of shaping a piece of wet clay on a potter,s wheel is called .

_____ are widely used in electric supply industry.

Saturated hydrocarbons are called.

S.I unit of heat is.

Ordinary _____ is made by adding sand,sand ash (sodium oxide) and limestone (Calcium oxide).

Minerals that are commercially valuable are known as.

Usually chemical reactions take place in.