Answer:
The number before any molecular formula applies to the entire formula. So here you have five molecules of water with two hydrogen atoms and one oxygen atom per molecule. Thus you have ten hydrogen atoms and five oxygen atoms in total.
Answer:
The electrochemical reaction of the battery must be reversible.
Explanation:
An electrochemical cell is device in which chemical reactions produce electricity. There are two main types of electrochemical cells:
Primary cells: In primary cells, the chemical reaction through which electric current is generated is irreversible and hence cannot be re-charged.
Secondary cells: are those in which chemical reactions through which electricity is generated is reversible. Hence they can be re-charged.
Answer:
Promethium-147 changes into promethium-148.
Explanation:
Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.
During beta decay promethium-147 changes to promethium-148.
A rectangle box measures 6.00 in. in length, 7.00 in. in width, and 8.00 in. in height. The volume of the rectangular box is 5.506 L
Given,
1 inch = 2.54 cm
Length = 6.00 inches = 6.00 x 2.54 cm = 15.24 cm
Width = 7.00 inches = 7.00 x 2.54 cm = 17.78 cm
Height = 8.00 inches = 8.00 x 2.54 cm = 20.32 cm
Now,
Volume of rectangular box = Length x Width x Height
= 15.24 cm x 17.78 cm x 20.32 cm
= 5506.05 cm3
= 5506.05 mL (\small \because 1 cm3 = 1 mL)
= 5.506 L (\small \because 1000 mL = 1 L)
Hence, the volume of rectangular box is 5.506 L.
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