08, classification of matter pt 2

What is the main goal of the group activity involving sand and salt?

To isolate sand from salt using provided materials.

What verb tense should be used when giving instructions in a lab procedure?

Imperative tense.

What verb tense should be used when describing a lab that has been completed?

Past passive tense.

Why is it important to be specific when referring to glassware in a procedure?

To ensure clarity and reproducibility of the experiment.

What should the quantities in a procedure reflect?

The precision of the instruments used.

What is the goal of the experimental design assignment involving salt and water?

To design a procedure that demonstrates quantitatively that the mixture is homogeneous.

What is the significance of the atomic number in the periodic table?

It organizes elements by the number of protons.

What do the columns in the periodic table represent?

Groups or families, which indicate the number of valence electrons.

What do the rows in the periodic table represent?

Periods, which indicate the number of electron shells.

What are alkali metals, and which group do they belong to?

Very reactive metals in Group 1 (except hydrogen) that react with water to form bases and flammable hydrogen gas.

What are alkaline earth metals, and which group do they belong to?

Elements in Group 2 that are very abundant in Earth's crust.

What are halogens, and which group do they belong to?

Elements in Group 17 known as 'salt makers.'

What are noble gases, and which group do they belong to?

Elements in Group 18 that are non-reactive.

What are the main classifications of elements in the periodic table?

Metals, nonmetals, metalloids, main group metals, transition metals, and inner transition metals.

What is a flowchart used for in the context of writing a lab procedure?

To outline the necessary steps for the procedure.

What should be included in a lab procedure to ensure it can answer the research question?

Sufficient detail and clarity in the steps to allow reproducibility.

What is the purpose of using a balance with ± 0.01 g precision in the lab?

To ensure accurate measurement of mass in experiments.

What is the importance of the drying oven in the experimental design?

It is used to remove moisture from samples during the experiment.

What is the role of a volumetric pipette in a lab procedure?

To measure and transfer precise volumes of liquid.

What criteria should be assessed when evaluating a lab procedure?

Whether the procedure answers the research question and has sufficient detail.

What is the significance of using the correct criteria in writing a lab procedure?

To ensure the procedure is effective and scientifically valid.

What materials are typically used to separate sand from salt in a lab?

Hot plate, filter paper, funnel, conical flask, water, glass rod, evaporating dish, and watch glass.