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- Multiple ChoicePlease save your changes before editing any questions.
What is valency of sodium?
1
2
3
4
- Multiple ChoicePlease save your changes before editing any questions.subatomic particles found on the outermost shell & responsible for the atom's reactivityneutronsvalence electronsisotopesions
- Multiple ChoicePlease save your changes before editing any questions.Value representing the number of protons in an elementAtomic MassMass NumberValence ElectronsAtomic Number
- Multiple ChoicePlease save your changes before editing any questions.
WHICH ONE IS A MIXTURE?
BLOOD
CARBON DIOXIDE
SILICON
SODIUM
TIN
- Multiple ChoicePlease save your changes before editing any questions.
What is the solute in the soda water?
Water
Carbon dioxide
Sugar
Oxygen
- Multiple ChoicePlease save your changes before editing any questions.What are the basic building blocks for all matter?atomselementscompoundschemicals
- Multiple ChoicePlease save your changes before editing any questions.An oxygen molecule usually has two oxygen atoms.TrueFalse
- Multiple ChoicePlease save your changes before editing any questions.
Aluminium has 13 protons, 1 neutrons, 13 electrons. What is the atomic number?
26
1
13
12
- Multiple ChoicePlease save your changes before editing any questions.
Methane has _____ atoms
1
3
4
5
- Multiple ChoicePlease save your changes before editing any questions.
molecular formula of copper and bromine is
CuBr2
CUBR
Cu2Br
CuBr
- Multiple ChoicePlease save your changes before editing any questions.
Atomicity of phosphorus namaste is
monoatomic
Diatomic
poly atomic
tetra atomic
- Multiple ChoicePlease save your changes before editing any questions.
H2SO4 Is the chemical formula of......
Hydrogen Chloride
Sulfuric acid
Nitric acid
Carbonic acid
- Multiple ChoicePlease save your changes before editing any questions.
Valency of inert gas elements.
0
2
1
3
- Multiple ChoicePlease save your changes before editing any questions.
What happens when salty water is boiled?
The salt becomes a new compound and water evaporates as it has a low boiling point
The water evaporates and the salt remains in the beaker as it has a high melting point
The water becomes a new compound and evaporates while salt remains in the beaker
The water will disappear and the salt remains in the beaker as it is a solid
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following separations cannot be carried out using a centrifuge? The separation of:
water from wet clothes
cream from milk
red blood cells from plasma
salt from sea water
- Multiple ChoicePlease save your changes before editing any questions.
Complete the sentence:
___________ allows to separate the fine flour particles from bigger impurities (lumps).
Filtration
Decantation
Sieving
Magnetism
- Multiple ChoicePlease save your changes before editing any questions.
In a coffee machine, the ground coffee is separated from the coffee solution by using..
sand paper
filter paper
toilet paper
tissue paper
- Multiple ChoicePlease save your changes before editing any questions.Iron fillings can be separated from iron and Sulphur mixture bysedementationheatingmagnetic attractionseiving
- Multiple ChoicePlease save your changes before editing any questions.Can you separate salt from water using filtration?yesno
- Multiple ChoicePlease save your changes before editing any questions.What is the relative molecular mass of fluorine gas, F2?1938918
- Multiple ChoicePlease save your changes before editing any questions.What is the relative formula mass of NaOH?20394045
- Multiple ChoicePlease save your changes before editing any questions.
Name the compound PH3.
Triphosphorus trihydride
Phosphorus hydride
Trihydrogen monophosphide
Phosphorus trihydride
- Multiple ChoicePlease save your changes before editing any questions.
Which of these have mass 44 u?
H2O
H2O2
P2O5
CO2
- Multiple ChoicePlease save your changes before editing any questions.
Element with atomic number 8 is
Carbon
Nitrogen
Oxygen
Fluorine
- Multiple ChoicePlease save your changes before editing any questions.What is the molar mass of table salt (NaCl)?116.886 g/mol35.453 g/mol22.990 g/mol58.443 g/mol