Lab Equipment
Which instrument is used to measure mass
Balance or scale
Is iron (Fe) a metal, nonmetal, or metalloid?
Metal, it is shiny, malleable, and conducts electricity.
Is oxygen (O₂) an element, compound, or mixture?
it’s made of only one type of atom.
In the chemical formula H₂O, what elements are present?
2 Hydrogen and Oxygen
What is the formula for density?
Density = Mass ÷ Volume
Which tool would you use to measure liquid volume accurately?
Graduated cylinder
Which type of element is brittle, dull, and does not conduct electricity well?
Nonmetal
When hydrogen and oxygen combine to form water (H₂O), what do they make?
A compound — because different elements are chemically combined.
How many oxygen atoms are in the formula CO₂?
2 oxygen atoms
An object has a mass of 12 grams and a volume of 3 cm³. What is its density?
4 g/cm³
Which instrument would you use to look at tiny objects like cells?
Microscope
Which type of element has properties of both metals and nonmetals?
Metalloids
If you mix sand and salt, is it an element, compound, or mixture?
mixture because the substances are physically combined and can be separated.
In 3H₂O, how many total hydrogen atoms are there?
Each H₂O has 2 hydrogen atoms → 3 × 2 = 6 hydrogen atoms
A block of wood has a density of 0.7 g/cm³. Will it float or sink in water?
It will float, because its density is less than water (1.0 g/cm³).
Which lab instrument is used to heat chemicals safely?
Bunsen burner
How is a metal different from a nonmetal in terms of conductivity and malleability?
Metals: good conductors, malleable, ductile, shiny.
Nonmetals: poor conductors, brittle, not shiny.
Juice with pulp is heterogeneous, but clear juice is homogeneous. Why does adding pulp make it heterogeneous?
Pulp creates visible parts that are not evenly distributed, breaking the uniformity.
In the formula Ca(OH)₂, how many oxygen atoms are there?
The ₂ applies to everything in parentheses → 1 calcium, 2 oxygen, and 2 hydrogen atoms.
Two objects have the same mass, but one takes up more space. Which one is less dense and why?
The one that takes up more space (greater volume) is less dense, because the same mass is spread out over a larger volume.
If a student spills a chemical on their hand, which instrument or station should they use immediately?
Eye wash station or safety shower
Silicon is a metalloid used in computer chips. Why are metalloids like silicon important in electronics?
Because metalloids can conduct electricity sometimes, making them useful as semiconductors.
How is a compound different from a mixture?
A compound has elements chemically bonded in a fixed ratio.
A mixture has substances physically combined and can be separated easily.
How many total atoms are in 2Al₂(SO₄)₃?
34 atoms
How does temperature affect the density of air and water?
When temperature increases, particles move faster and spread out, so the density decreases.
When temperature decreases, particles move slower and get closer together, so the density increases.