Answer:
A substance is basic or alkaline if it's pH is greater than 7.0.
Answer : The molar mass of catalase is, 
Explanation :
Formula used :

where,
= osmotic pressure = 0.745 torr = 0.000980 atm (1 atm = 760 torr)
C = concentration
R = solution constant = 0.0821 L.atm/mol.K
T = temperature = 
w = mass of catalase = 10.03 g
M = molar mass of catalase = ?
V = volume of solution = 1.05 L
Now put all the given values in the above formula, we get:


Therefore, the molar mass of catalase is, 
Answer:
Samira's model is incorrect because not all atoms are accounted for
Explanation:
The image of Samira's model has been attached to this answer to enhance the explanation.
What is depicted in that model is rightly regarded as a chemical change. In a chemical change atoms of substances are rearranged as new substances are formed.
However, all atoms in the products must also be found in at least one of the reactants. In this case we have an atom in one of the products that is not accounted for. Hence the model is incorrect.
I’ve only had one and it didn’t flow so ion think so
Okay so just add all of them up the fine the x and the y and d the times that by the size of yiurn four head