No. Of protons = mass no. - no. Of neutrons
No. Of protons = 67 - 37
= 30
No. Of electrons = 28
Zinc will have 30 protons and 28 electrons. So, it will have +2 charge
Symbol - Zn^+2
1. Lemon juice (pH 2.2) = Acidic
2. Salt solution (pH 7) = Neutral
3. Baking soda (pH 9) = Alkaline
4. Bleach (pH 13) = Alkaline
5. Tomato juice (pH 4) = Acidic
6. Gastric juices (pH 1) = Acidic
<h3>Explanation: </h3>
The pH scale measures how acidic or alkaline a substance is. The pH scale ranges from <u>0 to 14.</u>
A pH of 7 is neutral.
Acidic substances have pH less than 7.
Alkaline(Base) substances have a pH greater than 7
Hence, the given samples can be categorized as acidic, basic or neutral based on their pH values.
1. Lemon juice (pH 2.2 < 7) = Acidic
2. Salt solution (pH 7 = 7) = Neutral
3. Baking soda (pH 9 > 7) = Alkaline
4. Bleach (pH 13 >7) = Alkaline
5. Tomato juice (pH 4 < 7) = Acidic
6. Gastric juices (pH 1 < 7) = Acidic
Answer:
cd
Explanation:
image is formed due to reflected light rays and it is enlarged because image distance/ object distance = height of image/height of object
v>u so image is enlarged
Answer:
To really 'see' inside the atom and detect fundamental particles we need to go beyond visible light and bounce particles off the smallest building blocks of the Universe to 'observe' them. This session introduces students to the scientific process—how scientific methods and theories are updated and develop as new evidence and information is collected.
Explanation:
Answer: Divide the mass of the first dissolved component by the solution mass, and then multiply the result by 100 to calculate the mass percentage. In our example, the first dissolved compound is NaCl; the mass percent is (10 g / 136 g) x 100 percent = 7.35 percent.
Explanation: its up, look
