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प्रश्न
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
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उत्तर
In water, the ratio of oxygen to hydrogen is 8:1 by mass.
APPEARS IN
संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
How are isobars different from isotopes ?
Fill in the blank
An ion with positive charge is called ______
Define: Relative atomic mass
Who originated the word ‘atom’ ?
State Dalton’s atomic theory.
Fill in the blank
An excess of electrons produces a ________ charge.
How is the size of an atom indicated ?
One nm is equal to :
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Define the following term:
Atom
Name the gas that.
Turns moist starch iodide paper blue black.
A compound containing one atom of carbon and two atoms of oxygen is ______.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
______ is a substance that is made up of three oxygen atoms chemically combined.
Atoms have a radius of the order ______.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
