The first statement (Matter is neither created nor destroyed) is correct.
The second statement would violate the law of conservation of mass (I will refer to this as LCM), as it would mean matter can "flow" into the universe, but not out, meaning the total matter will never be less than it was before.
The third statement violates LCM because it means matter is created during a reaction, which is not true.
The last statement violates LCM because it means matter is lost during a reaction, which is not true.
Huh? I need more info to answer this
Answer:
= 0.014 g of BaCO3
Explanation:
Let x = mol/L of BaCO3 that dissolve.
This will give;
x mol/L Ba2+ and x mol/L CO32-
But;
Ksp = 5.1x10^-9.
Therefore;
Ksp = 5.1 x 10^-9 = (x)(x)
Thus;
x = molar solubility
= √ (5.1 x 10^-9)
= 7.1 x 10^-5 M
Therefore;
Mass BaCO3 = 7.1 x 10^-5 M x 1 L x 197.34 g/mol
= 0.014 g
Answer:
i think the answer will be b. the point where the ph corresponds to a solution of the conjugate acid (bh+) in water;
Explanation:
Answer : The 
for the combustion of naphthalene is 
Solution : Given,
Mass of naphthalene = 1.025 g
Initial temperature = 
Final temperature = 
Specific heat capacity of calorimeter = 
Molar mass of naphthalene = 128 g/mole
First, we have to calculate the heat absorbed, 
Formula used :
Now put all the given values in this formula, we get
Now we have to calculate the moles of naphthalene.
Moles of 
= 
Now we have to calculate the for combustion of naphthalene.
where,
q = heat absorbed
n = number of moles
Now put all the values in this formula, we get
Therefore, the for the combustion of naphthalene is
