Honors Chemistry Quiz on Lab Safety and Matter

What should you do to smell a substance, how is this safer?

Wafting allows for safe smelling, not to much odor and not puting your face close to the substance

What is the term for the “thing” that your line of sight must be level with when measuring the volume of liquid in a gradual cylinder?

Meniscus

Physical or Chemical change?-Wood burning

Chemical

Physical or Chemical change?-Iron rusting

Chemical

Physical or Chemical change?-Dynamite exploding

Chemical

Physical or Chemical change?-Dissolving sugar in water

Physical

Physical or Chemical change?-Melting wax

Physical

Physical or Chemical change?-Cooking an egg

Chemical

Physical or Chemical change?-Condensing water vapor

Physical

Physical or Chemical change?-Carving a piece of wood

Physical

Physical or Chemical change?-Milk sours when out of fridge

Chemical

Physical or Chemical change?-Tums neutralizes stomach acid

Chemical

Physical or Chemical change?-Sugar caramelizing when heated

Chemical

Physical or Chemical change?-Tearing a peice of paper

Physical

Which statement accuratley describes the scale of atoms as presented in the sources?

An Atoms size is so infinitesimally small that a single grain of sand contains a greater number of atoms than there are grains of sand on a large beach.

Describe atoms in an existing substance

Packed close to each other in fixed locations,forming a cystalliane solid.

What is the characteristic motion of atoms or molecules specifically in solid matter?

They exhibit oscillation or vibration about fixed points.

Which statement accurately distinguishes an amorphous solid from a crystalline solid, according to the sources?

Amorphous solids lack any long-range order in their atomic arrangement, whereas crystalline solids possess a well-ordered, repeating structure.

The primary reason gases are compressible is explicitly stated as:

The atoms or molecules that compose gases are not in contact with one another and are far apart.

Describe a compound?

It is a pure substance composed of two or more elements chemically united in fixed, definite proportions.

Which specific example is given in the sources to illustrate a homogeneous mixture?

Sweetened tea with all sugar dissolved, showing uniform composition.

What is the fundamental characteristic defining a physical change in matter?

Matter changing its appearance or state, but not its chemical composition.