It forms a white powder
Explanation:
Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction.
Molarity is defined as the number of moles of solute in 1 L of solution
mass fo KCl in the solution is - 5.0 g
number of moles of KCl - 5.0 g/ 74.5 g/mol = 0.067 mol
number of moles of KCl in 100 mL - 0.067 mol
therefore number of KCl moles in 1 L - 0.067 / 100 mL x 1000 mL = 0.67 M
molarity of KCl is 0.67 M
Answer:
0.6139M
Explanation:
A 3.50% by mass of NaCl means there are 3,50g of NaCl in 100g of solution. To find molarity we need to convert the mass of NaCl to moles and mass of solution to liters as follows:
<em>Moles NaCl -molar mass: 58.44g/mol-:</em>
3.50g NaCl * (1mol / 58.44g) = 0.05989 moles of NaCl
<em>Liters solution:</em>
100g solution * (1mL / 1.025g) * (1L / 1000mL) = 0.09756L of solution
<em>Molarity -Ratio of moles and liters-:</em>
0.05989 moles of NaCl / 0.09756L of solution =
<h3>0.6139M</h3>
Answer:
- C. it is a strong acid since the blue litmus paper turns red and the pH is 1.7
Explanation:
As per table gastric juice has pH of 1.7 which is the strong acid. If you remember, 0-7 range determines acids and litmus paper confirms that by turning red.
So correct choice is C.
Answer:
In the case of s and p orbitals, there can be three types of overlap. s – s orbital overlap (formation of H2 molecule): The mutual overlap between the half-filled s orbitals of two atoms is called s – s overlap and the covalent bond formed is known as sigma (s) bond. e.g. formation of a hydrogen molecule from two hydrogen atoms.
Explanation:
