Question

2025 chemistry unit test shaughnessy
part a: multiple choice choose the best answer. write it in the box in section a of the written section of this test.

1. which of the following is not produced directly through complete combustion? (a) carbon soot (b) water (c) carbon dioxide (d) carbon monoxide (e) a and d
2. in the periodic table, elements with similar properties are grouped in: (a) diagonal rows (b) horizontal rows (c) periods (d) vertical columns (e) rectangular blocks
3. the lewis dot diagram for an element shows the: (a) innermost electrons (b) outermost electrons (c) protons (d) neutrons
4. which of the following is not a property of acids? (a) has a bitter taste (b) produces hydrogen ions in water (c) is corrosive (d) conducts electricity (e) reacts with metals
5. which of the following is not evidence of a chemical change? (a) solid forms in a mixture (b) bubbles appear after mixing (c) heat/light given off when heated (d) change of state of a liquid
6. a covalent bond is due to: (a) transfer of electrons (b) attraction between ions (c) gain/loss of electrons (d) magnetic attraction (e) sharing of electrons
7. which of the following experiments provides the best data to support the law of conservation of mass? (a) open flask (b) open flask on scale (c) closed flask (d) closed flask after adding another mass?
8. you used phenolphthalein as a ph indicator. it was clear, but turned pink after adding another substance. what conclusion can you make? (a) ph < 7 (b) ph = 7 (c) ph > 7 but < 14 (d) neutral (e) acidic
9. an ionic bond occurs when: (a) electrons transfer from metal → non - metal (b) non - metal → metal (c) electrons shared between non - metals (d) protons shared between non - metals
10. whmis 2022: which symbol indicates a flammable or self - heating substance? (a) flame (b) skull and crossbones (c) biohazard (d) corrosion

part b: nomenclature (mixed)

1. write the chemical formula or chemical name for each of the following compounds.

sodium iodide bacl₂
manganese (iv) oxide nh₃

Explanation:

1.

Step1: Recall products of complete combustion

Complete combustion of a hydrocarbon produces carbon - dioxide and water. Carbon soot and carbon monoxide are produced in incomplete combustion.

Step2: Identify the answer

So carbon soot and carbon monoxide are not directly produced through complete combustion. The answer is (e).

Step1: Know the structure of the Periodic Table

In the Periodic Table, elements with similar properties are grouped in vertical columns called groups or families.

Step2: Select the correct option

The answer is (d).

Step1: Understand Lewis Dot diagrams

A Lewis Dot diagram for an element shows the valence electrons.

Step2: Determine the answer

The answer is (a).

Answer:

(e)

2.