Check out this 5 chemistry quiz and see how many you can answer.
1. One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
The average adult human body contains about 250 grams of salt, which is just over half a pound. If you don't have enough salt, your body suffers an electrolyte imbalance called hyponatremia.
2. If you fill a glass to the brim with ice water and the ice melts, what will happen?
One interesting property of water is that it achieves maximum density as a liquid, not as a solid. So, ice is less dense than water and floats. When it melts, it becomes more dense. More mass per unit volume means the level of the liquid drops slightly.
3. The symbol Sb stands for stibnum or stibnite. What is the modern name of this element?
Stibnum is the old name for antimony. Be careful you don't confuse the symbol with Sn for tin (a common tricky chemistry test question). Tin is safe enough to use to make cans for food. Antimony and most of its compounds are toxic.
4. Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
Milk is close to a neutral pH, but it's slightly acidic thanks in part to the lactic acid it contains.
5. DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
You'll find keratin primarily in your hair, nails, and skin, but the most abundant protein in humans is collagen, which is found in bone and cartilage. Both proteins are strong and flexible.
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