Answer:
The element with electronic configuartion 1s² and atomic number 3 must be an cation.
Explanation:
The "Z" shows the atomic number. Z stand for zahl. It Is German word and meaning is " number".
In given question Z is equal to three which means an element with atomic number three.
Let consider the X is an element with atomic number three having electronic configuration 1s², but according to this atomic number there should be one more electron present is 2s. If X has the electronic configuration 1s² it means that it lose one electron and X is present in the form of cation.
X⁺ = 1s²
Answer:
Sodium metaborate: sodium+boron+oxygen= NaBO 2.
The formula can be written also as Na 2O·B
Explanation:
When the substance is creating gases. Sometimes when it’s bubbling up
Answer:
31.9178 °C is the final temperature of the water
Explanation:
Mass of benzene burned = 6.200 g
Moles of benzene burned =
According to reaction , 2 moles of benzene gives 6542 kJ of energy on combustion.
Then 0.0794 mol of benzene on combustion will give:
Mass of water in which Q heat is added = m = 5691 g
Initial temperature =
Final temperature =
Specific heat of water = c = 4.18 J/g°C
Change in temperature of water =
31.9178 °C is the final temperature of the water
Answer:
The answer is melting and freezing point.
Explanation: