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Chemistry, 13.10.2019 09:30 hannahcolleen4895
Fill in the blanks:
1. during a chemical reaction, the sum of the of the reactants and products remain unchanged.
2. in a pure chemical compound, elements are always present in a proportion by mass.
3. clusters of atoms that act as an ion are called ions.
4. in ionic compounds, the charge on each ion is used to determine the the compound.
5. the avogadro constant is defined as the number of atoms in exactly of carbon-12
6. mass of 1 mole of a substance is called its
7. the abbreviation used for length names of elements are termed as their
8. a chemical formula is also known as a
9. those ions which are formed from single atoms are called
10. ionic compounds are formed by the combination between an
11. the valency of an ion is to the charge on the ion.
12. mole is a link between the and
13. the si unit of amount of a substance is
true / false:
1. formula mass of na2o is 62 amu.
2. those particles which have more or less electrons than the normal atoms are called ions
.
3. formula for sulphur dioxide is so3.
4. molar mass of ethyne (c2h2) is 26 g/mol.
5. 22 gm of co2 consists of 1 mole.
6. number of molecules in 32 gram of oxygen is 6.02 x 1023.
7. water is an atom.
8. formula for sulphur dioxide is so2.
9. clusters of atoms that act as an ion is called lopyatomic ion.
10. mass of 1 mole of a substance is called its formula mass.
11. in a pure chemical compound, elements are always present in a definite proportion by mass.
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