1. What could this picture represent? (A) pure element (B) homogeneous mixture (
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1. What could this picture represent? (A) pure element (B) homogeneous mixture (C) pure compound (D) heterogeneous mixture 2. What is the formula for a molecule of hydrogen? (A) H (B) H (C) HCI (D) H 3. Which is a physical change? (A) wood burning (C) silver tarnishing (B) iron rusting (D) gold melting 4. Which formula is paired with its correct name? Name (A) HCIO (B) Hs (C) HNO trous acid hydrochloric acid sulfuric acid (D) H,PO, phosphoric acid 5. How many oxygen atoms are contained in a molecule of diphosphorus pentoxide? (A) 2 (B) 5 (C) 7 (D) 10 . What is the length of the object? 20 cm 10 cm object (A) 7.2 cm 17.2 cm (B) 7.20 cm (D) 17.20 cm C)Explanation / Answer
Ans1) C This is an example of compound because in each molecule we can see 2 types of atom.
Ans2)D molecule of hydrogen means H2
Ans3)D solid to liquid conversion of gold is physical change
Ans4)C
Ans5)B
Ans6)A
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