Elements & Compounds
Which of the following is a compound?
A) Sodium
B) Nitrogen
C) Sugar
D) Chlorine
C) Sugar (✅)
When two liquids bubble and the total weight decreases after mixing, what happened?
A) Atoms disappeared
B) Some atoms escaped into the air
C) Atoms were destroyed
D) Weight was not measured correctly
B) Some atoms escaped into the air (✅)
This is a nonrenewable resource: oil, sunlight, water, or wood?
A) Sunlight
B) Water
C) Wood
D) Oil
D) Oil (✅)
Which disease is caused by a fungal infection?
A) Influenza
B) Athlete’s foot
C) Cold
D) Chickenpox
B) Athlete’s foot (✅)
Identical index fossils in two rock layers suggest they formed:
A) At different times
B) Approximately the same time
C) In different locations only
D) Millions of years apart
B) Approximately the same time (✅)
What is the approximate melting point of Rubidium (Rb) in °C?
A) 25
B) 50
C) 75
D) 100
A) 25 (✅)
Which law states that the mass of atoms in reactants equals the mass in products?
A) Law of Conservation of Energy
B) Law of Conservation of Mass
C) Law of Gravity
D) Law of Thermodynamics
B) Law of Conservation of Mass (✅)
An increase in this in an estuary affects salt-tolerant and salt-intolerant organisms.
A) Temperature
B) Salinity
C) pH
D) Turbidity
B) Salinity (✅)
Pandemics differ from epidemics because they:
A) Affect only animals
B) Affect many countries or states
C) Affect one neighborhood
D) Affect only plants.
B) Affect many countries or states (✅)
The most accurate method scientists use to determine Earth’s age is:
A) Carbon dating
B) Radioactive dating of rocks
C) Counting tree rings
D) Measuring temperature
B) Radioactive dating of rocks (✅)
Which element has 7 valence electrons and bonds readily with group 1 elements?
A) Oxygen
B) Chlorine
C) Carbon
D) Helium
B) Chlorine (✅)
Which chemical equation best shows the Law of Conservation of Mass?
A) H + O -->H2O
B) H2 + O2 --> H2O
C) 2H2 + O2 --> 2H2O
D) H2 + O2 --> 2H2O2
C) 2H2 + O2 --> 2H2O (✅)
High turbidity levels in a lake indicate this about water safety.
A) The water is safe for drinking
B) The water is not safe for drinking
C) Fish population is high
D) The lake is frozen
B) The water is not safe for drinking (✅)
Genetic engineering has helped farming by:
A) Creating crops that resist some diseases
B) Increasing insect pests
C) Reducing crop yields
D) Removing nutrients from soil
A) Creating crops that resist some diseases (✅)
Studying ice cores helps scientists learn about:
A) Future weather only
B) Past climates by analyzing trapped gases and particles
C) Ocean currents
D) Volcanic eruptions
B) Past climates by analyzing trapped gases and particles (✅)
Which of these is an element?
A) Vinegar
B) Water
C) Iron
D) Carbon dioxide
C) Iron (✅)
Burning fossil fuels mainly causes which environmental problem?
A) Global cooling
B) Smog causing respiratory illnesses
C) Earthquakes
D) Deforestation
B) Smog causing respiratory illnesses (✅)
Upwellings help fishermen by bringing:
A) Freshwater
B) Nutrients
C) Pollution
D) Oil
B) Nutrients (✅)
What best increases genetic variation in a population?
A) Decrease in mutations
B) Increase in mutations
C) Cloning
D) Stable environment
B) Increase in mutations (✅)
The total amount of water on Earth over time is:
A) Increasing rapidly
B) Decreasing rapidly
C) Relatively constant
D) Unknown
C) Relatively constant (✅)
Which sequence best represents the elements in Period 5?
A) Nonreactive gases only
B) Metals only
C) Highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases
D) Only nonmetals
C) Highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases (✅)
Which action shows concern for ocean resources?
A) Increasing fish harvesting
B) Setting limits on fish harvesting
C) Polluting oceans
D) Ignoring regulations
B) Setting limits on fish harvesting (✅)
Which water quality factor provides the most information about ecosystem health?
A) Temperature
B) pH
C) Presence of indicator species
D) Turbidity
C) Presence of indicator species (✅)
Best evidence for evolution is:
A) Old rock layers containing complex fossils
B) New rock layers containing fossils unlike existing organisms
C) Fossils only in one location
D) No fossils in new layers
B) New rock layers containing fossils unlike existing organisms (✅)
Which best describes uniformitarianism?
A) The time it takes for erosion to occur has changed since Earth first formed.
B) The movement of the continents no longer occurs because of changes in ocean currents.
C) The processes that shape the Earth continue as they have since the Earth formed.
D) The formation of rock layers has slowed because humans have altered the environment.
C) The processes that shape the Earth continue as they have since the Earth formed. (✅)