Question

3. What property of an element is shown when a Grade 7 leamer reported to his teacher that he uses 0.40 g of sodium crystals in his experiment procedure?
A. acidity
B. color
C. mass
D. toxicity
4. Which of the following substances in an example of an element?
A fruit salad
B. ice candy
C. iron nail
D. spaghetti 11​

Answer 1

Answer:

Q1. ans mass

Q2.ans iron nail

Answer 2

The questions are answered below:

3. The following property of an element is shown when a Grade 7 leamer reported to his teacher that he uses 0.40 g of sodium crystals in his experiment procedure: C. mass.

• When the leaner reported that 0.40 g of sodium crystals are used, then 0.40 g is a measure of a certain property of the sodium crystals.
• All substances possess mass, which is measured as kilogram or gram.
• Thus, we can say that the property of the mass of the element is reported here.

4. The following substance is an example of an element - C. iron nail.

• Iron nail contains only one type of atom in it, which is required for a substance to be an element. (Iron is not rusted.)
• Fruit salad has different types of fruit and milk, so it cannot be an element.
• Ice candy also has different materials used in it, so it is also not an element.
• Spaghetti again has different materials, hence it is not an element.