True
Explanation:
In the crystal of an ionic compound, the cations are surrounded by anions so that the charges of the ions are balanced. This very correct.
Ionic compounds are electrically neutral and forms by a charge balance.
- To form an ionic crystal, the charges overall must be balanced and the compound must remain electrically neutral.
- Equal number of charges on the metal and non-metal must cancel out to establish an electrostatic force.
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<u>Answer:</u> The concentration of zinc oxalate is 
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:
We are given:
Moles of zinc oxalate = 
(Conversion factor: 
)
Volume of solution = 450 mL
Putting values in above equation, we get:
In case of multiplication and division, the number of significant digits is taken from the value which has least precise significant digits. Here, the least precise number of significant digits are 2.
Hence, the concentration of zinc oxalate is
When a 10g sample of liquid water increases in temperature from 13°C to 18°C, then the amount of gained energy is 209 joules.
<h3>How do we calculate gained energy?</h3>
The amount of energy which is gained by any sample will be calculated as:
Q = mcΔT, where
Q = gained energy
m = mass of sample = 10g
c = specific heat of water = 4.18 J/g°C
ΔT = change in temperature = 18 - 13 = 5°C
On putting values we get
Q = (10)(4.18)(5)
Q = 209 Joules
Hence required amount of energy is 209 joules.
To know more about gained energy, visit the below link:
brainly.com/question/21704399
