Physical Properties
Atoms & Elements
States & Changes of Matter
Photosynthesis and Respiration
Mix it Up
100
What is the formula for density?
Density = Mass/Volume
100
What is the atomic theory?
The scientific theory that matter is composed of particles called atoms
100
What phase change occurs when a substance cools down to its melting point?
Solid to liquid
100
Does mass change in cellular respiration?
No, due to the law of the conservation of mass
100
Is salad a type of homogenous or heterogenous mixture? Why?
Heterogenous because it is not consistent through the mixture. It has different parts that are easily seen.
200
Which liquid is the least dense? Which one is the most dense? Why?
Ethyl alcohol is the least dense, because it stays at the top. Honey is the most dense, because it sinks to the bottom.
200
What are the two parts of the structure of an atom, and in which is most of the mass located in an atom? Why?
The nucleus and cloud of electrons. The nucleus is where most of the mass is located, because the neutrons and protons are much heavier than electrons.
200
What phase change occurs when a substance cools down to its boiling point?
Liquid to gas
200
Is photosynthesis a chemical change or a physical change? Why?
The chemical reaction that takes place in photosynthesis process involves a reaction between carbon dioxide, water, and light to form glucose and oxygen. Because a new product is formed in this process, photosynthesis is a chemical change.
200
Define acid, base, and neutral
Acid: any substance with a pH < 7
Base: any substance with a pH > 7
Neutral: any substance with a pH = 7
300
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury
13.6 g/mL
300
What are the 3 types of subatomic particles and their charges?
Protons are positive, neutrons are neutral, and electrons are negative
300
Does the amount of mass change in a chemical change? In a physical change?
No, the law of conservation of mass states that mass cannot be created nor destroyed
300
What is the equation of photosynthesis?
6CO2 + 6H2O + energy --> C6H12O6 + 6O2
carbon dioxide + water + energy --> glucose + oxygen
300
What are two elements that would behave similarly to chlorine?
fluorine, bromine, iodine, astatine, tennessine
400
An apple weighs 100g and has a volume of 80cm^3. What is its density? Does it float in water?
0.8g/cm^3
Yes, it floats in water because it has a lower density than water, which equals 1g/cm^3
400
How are elements with similar properties grouped in the periodic table?
Columns/groups. They are also called families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties.
400
400
What is the equation of respiration?
C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy
glucose + oxygen --> carbon dioxide + water + energy
400
Why does a wire have copper on the inside and rubber on the outside?
Copper is an excellent conductor of electricity, while rubber is an insulator that does not allow the flow of electricity. This protects the circuit and allows people to safely handle wires.
500
What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.
157.8g
500
Explain the difference between elements vs. compounds vs. mixtures
An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.
500
What 3 factors can help increase the rate of a reaction?
Increasing temperature, concentration, pressure
500
What is the relationship between photosynthesis and respiration?
The glucose and oxygen made by photosynthesis is used in cellular respiration, and the carbon dioxide made in cellular respiration is used in photosynthesis.
500
28.5 g of iron is added to a graduated cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL mark, from this information, calculate the density of iron.
Hint: You can find the volume of an irregular solid using water displacement
Volume of iron: 49.10 mL−45.50 mL= 3.60 mL
Density of iron: 28.5 g / 3.60 mL= 7.92 g/mL
The density of iron is 7.92 g/mL