Question

5 question review: answer the following questions about oxygen; 1. a. group number b. period number c. family name d. classification e. state of matter 2. a scientist measured 4.8g of aluminium. if the density is 2.7 g/ml what is the volume? 3. design a short experiment include and highlight the dependent variable and the independent variable. 4. write and solve a problem involving percent error. 5. list 3 chemical properties and 3 chemical changes.

Explanation:

1.

Step1: Identify group number of oxygen

Oxygen is in group 16.

Step2: Identify period number of oxygen

Oxygen is in period 2.

Step3: Identify family name of oxygen

Oxygen belongs to the chalcogen family.

Step4: Identify classification of oxygen

Oxygen is a non - metal.

Step5: Identify state of matter of oxygen

At standard temperature and pressure, oxygen is a gas.

Step1: Recall density formula

The density formula is $
ho=\frac{m}{V}$, where $
ho$ is density, $m$ is mass and $V$ is volume. We need to solve for $V$, so $V = \frac{m}{
ho}$.

Step2: Substitute values

Given $m = 4.8g$ and $
ho=2.7g/mL$. Then $V=\frac{4.8g}{2.7g/mL}\approx1.78mL$.

Step1: Design experiment

Let's design an experiment to study the effect of light intensity on the rate of photosynthesis in plants. Place a plant in a beaker of water. Use different wattage light bulbs as a light source at a fixed distance from the plant.

Step2: Identify variables

The independent variable is the light intensity (changed by using different wattage light bulbs). The dependent variable is the rate of photosynthesis, which can be measured by the number of oxygen bubbles produced by the plant in a given time.

Answer:

a. 16
b. 2
c. Chalcogen
d. Non - metal
e. Gas

2.