Science Worksheet Answers (W5B)

Hi All, this is the corrections for W5B.

1. A
2. B
3. D
4. A
5. C

Structured Questions
1a) Nitrogen, Oxygen
1b) Magnesium, Oxygen
1c) Aluminium, FLOURINE
1d) Carbon, Hydrogen, Oxygen
1e) Carbon, Oxygen
1f) Calcium, Oxygen
1g) Copper, Sulfur

True or False
a) F
b) F
c) T
d) T
e) F
f) (a) A compound can be made up of three or more elements chemically combined (eg. Ammonium Acetate, CH3COONH4)

   (b) *Unsure. Sorry for the inconvenience.

   (e) A compound can not be always be in the same physical state as its elements.

2a) Sodium Chloride
2b) Sodium, Chlorine
2c) Table salt is in the solid form, while chlorine is gaseous in room temperature, and its elements cannot be broken down by heat but salt can be.

3a) Q is produced by chemically combining two substances through heating (chemical method), R decomposes to black solid and gas when heated.

3b) S

4) This is a graphic organizer, thus difficult to put up here. Kindly find out from your buddies/classmates. Thanks.

5a) Iron, Chlorine
5b) 3.
5c) Compound. It consists of 2 elements and it is chemically combined. It also has properties different from its elements.