Answer:
Four Ca²⁺ and eight Cl⁻ ions.
Explanation:
If
0.20 mol·L⁻¹ NaCl = 8Na⁺ + 8Cl⁻
Then
0.10 mol·L⁻¹ NaCl = 4Na⁺ + 4Cl⁻
And
0.10 mol·L⁻¹ CaCl₂ = 4Ca²⁺ + 8Cl⁻
The square will contain 4 Ca²⁺ ions and 8 Cl⁻ ions.
It should resemble the diagram below
Answer: hello your question has some missing details attached below is the missing details
answer : 25.5% ( B )
Explanation:
<u>Determine percentage yield </u>
molar mass = 35 g/mol
mass of Li₃N(s) = 70 g
product LiH(s) = 8.0 g ( actual yield )
theoretical yield ( LiH ) = 4 * 7.95 = 31.8 g
percentage yield = actual yield * 100 / theoretical yield
= 8 * 100/31.8
= 25.5%
Answer:
D- Assertion is false and Reason is true
Explanation:
Precipitation is said to have occurred when an insoluble product is formed from soluble ones. Let us take an instance;
BaCl2(aq) + H2SO4(aq) -------> BaSO4(s) + 2HCl(aq)
The barium sulphate so formed is an insoluble product obtained from the reaction of soluble barium chloride and sulphuric acid. This is a typical example of a double replacement reaction as the both ions exchanged partners.
Thus, the assertion is false but the reason is true.
Planets outside solar system are referred to as exoplanets. some scientists have put forward suggestions that there could be living organisms residing in some of the exoplanets. scientists have suggested that some exoplanets are found within the habitable distance from the star they revolve around. at this distance temperature can allow existence of liquid water. Where there is water automatically there is life. so astronomers may infer that life exist in exoplanets by determining whether they are with habitable distance from their star.
Answer:
they board up the windows evacuate sometimes and barricade doors
Explanation: