Lab Safety
Periodic Table 1
Periodic Table 2
Density
1
1
Density
2
2
P and C Changes 1
P and C Changes 2
Random!
100
What should you do if you accidentally spill a liquid chemical on your skin?
Immediately inform your teacher.
100
What are the rows in the periodic table called?
Periods
100
What type of elements can conduct electricity?
Metals
100
What is density?
Density is the mass per unit volume of a substance
100
Does the shape of an object affect its density? Why or why not?
No, density is a property of the material itself, not its shape.
100
What is a physical change? Give an example.
A change that does not alter the substance's chemical composition, like melting ice.
100
Provide an example of a chemical change you see in cooking.
Baking bread, where dough rises and changes chemically.
100
What safety gear should you wear when working with chemicals?
Safety goggles to protect your eyes and gloves to protect your hands.
200
Why is it necessary to wear safety goggles during experiments?
To protect your eyes from harmful chemicals or debris.
200
What are the columns in the periodic table called?
Groups or families
200
Name one characteristic of nonmetals.
- They are poor conductors of heat and electricity.
- They are brittle.
- They are dull.
200
How do you find the density of an object?
Use the formula Density=Mass/ Volume
200
Can two objects have the same volume but different densities? Give an example
Yes; a block of wood and a block of iron can have the same volume but different densities
200
What is a chemical change? Give an example.
A change that produces a new substance, like rust forming on iron.
200
How can you tell a physical change from a chemical change?
Physical changes can often be reversed; chemical changes create new substances
200
Why is the periodic table arranged the way it is, and how does this help us understand elements?
The periodic table is arranged by atomic number and groups elements with similar properties together. This helps us predict how elements will behave in reactions.
300
What is the proper way for students to pick up broken glass in the lab?
They don't! Notify the teacher to pick it up.
300
What are the bottom two periods called that are separated by themself?
Rare Earth Metals
300
What are metalloids, and where are they found on the periodic table?
Metalloids have properties of both metals and nonmetals and are found along the zig-zag line.
300
What does it mean if an object has a density of 1.02 and is placed in water?
It will float in water.
300
How does the size of an object affect its density?
Size does not affect density; density is an intrinsic property.
300
List three signs that a chemical change has taken place.
Color change, gas production (bubbles), precipitate formation, light production, and temperature change.
300
Why is rusting considered a chemical change?
It forms a new substance (iron oxide) and cannot be reversed by simple means.
300
What are 4 common properties of metals on the periodic table?
Metals are shiny, conduct heat and electricity well, malleable, and ductile
400
Name two safety items that should always be available in a lab in the event of a fire.
Fire extinguisher and fire blanket
400
How are elements organized in the periodic table?
By increasing atomic number and similar properties.
400
Give an example of a metal and a common use for it.
Iron; used in construction and manufacturing.
Copper; used in electrical wiring
Aluminum; used in baking sheet foil
400
How can density help scientists identify materials?
Different substances have unique densities, allowing identification based on measured density
400
What happens to the density of a gas compared to a liquid?
Gases are usually less dense than liquids because their particles are further apart.
400
Explain how a glow stick works to produce light
There is an inside tube with chemicals that breaks when you crack the glowstick. The chemicals mix with the rest of the glowstick and form a chemical reaction to make it glow.
400
Explain why an exploding soda is a physical change and not a chemical change if there are bubbles.
It is still soda that was shaken and formed bubbles, not a chemical reaction that forms bubbles
400
What is the density of an object that has a mass of 1400 g and volume of 70 mL? Include UNITS!
20 g/mL
500
Where should you exit if there is a fire in the laboratory?
Through door in the storage closet because it leads the outside
500
Why do elements in the same group have similar properties?
They have the same number of valence electrons.
500
How do nonmetals differ from metals in terms of physical properties?
Nonmetals are generally brittle, not shiny, and do not conduct electricity well.
500
What happens to the density of a substance when it is less dense than another
The less dense substance will float above the other. The more dense substance will sink above the other.
500
Why might a large piece of metal sink while a small piece floats?
The large piece may be less dense than the liquid it is in, while the small piece may be more dense.
500
What is an example of precipitate formation?
Rust, battery corrosion
500
How can you separate a mixture of salt water?
Boiling the mixture to evaporate the water.
500
What 5 signs show that a chemical change has happened, especially when color changes occur, like rusting?
- Color change
- Gas Production
- Light Production
- Temperature Change
- Precipitate Formation
600
Why is it important to read the instructions for a lab before doing them?
To understand the lab completely and make sure you know what to do and follow
600
How can you tell the difference between metals and nonmetals on the periodic table?
Metals are on the left side, while nonmetals are on the right side, separated by a zig-zag line of Metalloids
600
Why are metalloids useful in electronics and technology?
They can conduct electricity better than nonmetals but not as well as metals, making them useful for semiconductors.
600
Explain how density is used to make ships float.
Ships float because their design makes their overall average density, which includes large, hollow spaces filled with air, much less than the density of water.
600
Give an example density for Dawn dish soap.
Anything more than 1
600
Describe a situation in which a physical and chemical change occurs.
The burning of a candle. As the candle burns, the solid wax melts into a liquid (a physical change), and the candle wick is burned (chemical change)
600
What does it mean for a substance to oxidize?
It reacts with oxygen, often resulting in rust or tarnishing.
600
Why do some objects float in water while others sink?
Objects float if they are less dense than water because the buoyant force pushes them up.