Answer:
All plants present in the plant kingdom are separated by into smaller groups.The smaller groups contains plant species which are more similar to one another.
Some of the characteristics through which plant species can be separated are:
Gymnosperm or angiosperms: Pine are gymnosperm plants whereas strawberry plants are angiosperms. Cactus is also a gymnosperm.
Their location: Plants can be separated based on their habitats. For example, Cactus are desert- plants whereas pine and strawberries are not desert plants.
They are seed- producing plants or spore producing plants: pine are spore producing plants. Strawberry are seed-producing plants.
the anwer is A. condensation is the reverse of evaporation.
Answer:
0.7 moles of Ca(OH)₂ are produced.
Mass of hydrogen gas = 1.4 g
Explanation:
Given data:
Mass of water = 25.0 g
Mass of hydrogen gas produced = ?
Number of moles of Ca(OH)₂ formed = ?
Solution:
Chemical equation:
Ca + 2H₂O → Ca(OH)₂ + H₂
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 25.0 g/ 18 g/mol
Number of moles = 1.4 mol
Now we will compare the moles of water with hydrogen:
H₂O : H₂
2 : 1
1.4 : 1/2×1.4 = 0.7 mol
Mass of hydrogen gas produced:
Mass = number of moles × molar mass
Mass = 0.7 mol × 2 g/mol
Mass = 1.4 g
Now we will compare the moles of water and Ca(OH)₂
H₂O : Ca(OH)₂
2 : 1
1.4 : 1/2×1.4 = 0.7 mol
Thus, 0.7 moles of Ca(OH)₂ are produced.
Answer:Hydrogen gas is prepared in laboratory by the action of dilute HCl upon granulated zinc. Note: This is a redox reaction since Zn is oxidized and H+ ions is reduced here. Procedure: ... Some crystals of copper sulphate are added to increase the rate of reaction.
Explanation:
The statement above is TRUE.
The periodic table refers to the table of chemical elements, in which the elements are arranged in order of their atomic numbers in such a way that, similar elements appear in vertical columns. Elements in the same column usually have similar atomic structures and similar chemical properties. Thus, the periodic table allows one to easily compared the properties of one element to that of another one depending on the placement of the elements in the periodic table.<span />