Cells are the basic units of life in living organisms. Which of the following components make up cells?(1 point)
Responses
atoms and tissues
atoms and tissues
atoms and molecules
atoms and molecules
molecules and organs
molecules and organs
tissues and organs
atoms and molecules
Question
Kelly has a sample of an unknown substance. Which properties of the substance will be the same no matter how large or small her sample is?
(1 point)
Responses
all of these
all of these
melting point, boiling point, and mass
melting point, boiling point, and mass
melting point, boiling point, conductivity, density
melting point, boiling point, conductivity, density
melting point, boiling point, conductivity, solubility, density
melting point, boiling point, and mass
Saturn's largest moon is Titan, shown below. Which of the following statements about Earth and Titan is true?
(1 point)
Responses
The gravitational force between Earth and Titan is less than that between Earth and Pluto.
The gravitational force between Earth and Titan is less than that between Earth and Pluto.
There is no gravitational force between Earth and Titan.
There is no gravitational force between Earth and Titan.
The gravitational force between Earth and Titan is more than that between Earth and Saturn.
The gravitational force between Earth and Titan is more than that between Earth and Saturn.
The gravitational force between Earth and Titan is less than that between Saturn and Titan.
The gravitational force between Earth and Titan is less than that between Earth and Pluto.
An observational field study allows scientists to gain information about how things occur or behave in nature. In what field of science would a scientist most likely perform an observational field study on how the rate of erosion is related to the widening of a river or stream?(1 point)
Responses
chemistry
chemistry
physics
physics
geology
geology
biology
biology
geology
20 of 3020 of 30 Items
Question
When automobiles are designed, engineers try to maximize their fuel efficiency. Even with modern technology, today's most efficient vehicles can only attain about 30% efficiency. That means of all the chemical energy of the fuel put into an automobile, only 30% of the fuel results in car motion. Which statement best explains why this happens?(1 point)
Responses
Much of the energy is destroyed.
Much of the energy is destroyed.
Most of the energy is transformed into mass.
Most of the energy is transformed into mass.
Most of the energy becomes chemical energy.
Most of the energy becomes chemical energy.
Much of the energy is transformed into heat.
Much of the energy is transformed into heat.
Question
Jay wants to know how the amount of acidity in rainwater influences the weathering rate of limestone. To answer his question, Jay performs an experiment in which he soaks identical pieces of limestone in 200 mL of different carbonic acid solutions. The pH of the solutions range from 3.0 to 5.5. After performing his experiment once, he reports his data and draws a conclusion. What can Jay do to improve the reliability and accuracy of his data?(1 point)
Responses
He can use different types of rocks but follow the same experimental procedure.
He can use different types of rocks but follow the same experimental procedure.
He can repeat his experiment using a sodium hydroxide base instead of carbonic acid.
He can repeat his experiment using a sodium hydroxide base instead of carbonic acid.
He can increase the volume of the carbonic acid solutions.
He can increase the volume of the carbonic acid solutions.
He can repeat his experiment multiple times and ask someone else to replicate his experiment.
He can repeat his experiment multiple times and ask someone else to replicate his experiment.
Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).Based on this information:(1 point)
Responses
carbon and hydrogen are elements and methane is a compound.
carbon and hydrogen are elements and methane is a compound.
carbon, hydrogen, and methane are all compounds.
carbon, hydrogen, and methane are all compounds.
methane is an element and carbon and hydrogen are compounds.
methane is an element and carbon and hydrogen are compounds.
carbon, hydrogen, and methane are all elements.
carbon, hydrogen, and methane are all elements.
carbon and hydrogen are elements and methane is a compound.
Mrs. Clark decides to do a demonstration for her class with a piece of notebook paper. Using a balance, Mrs. Clark discovers that the mass of the paper is 20 g. She then takes the piece of paper and cuts it into several small pieces. The cumulative mass of the small pieces is 20 g. What has Mrs. Clark demonstrated for her class?(1 point)
Responses
a chemical change involving change of mass
a chemical change involving change of mass
a physical change involving change of shape and size of matter
a physical change involving change of shape and size of matter
a physical change involving change of mass
a physical change involving change of mass
a chemical change involving change of shape and size of matter
a physical change involving change of shape and size of matter
The three classes of rocks are sedimentary, metamorphic, and igneous. How are rocks classified into one of these three groups?
(1 point)
Responses
According to the method of their formation
According to the method of their formation
According to how many times they have been through the rock cycle
According to how many times they have been through the rock cycle
According to the amount of weathering they have endured
According to the amount of weathering they have endured
According to their position in the lithosphere
According to the method of their formation
Visible light that reaches the Earth from the Sun is known as white light. Which of the following statements about white light is true?(1 point)
Responses
White light falls within the microwave portion of the electromagnetic spectrum.
White light falls within the microwave portion of the electromagnetic spectrum.
White light is made up of a spectrum of many different colors.
White light is made up of a spectrum of many different colors.
White light is made up of only one color.
White light is made up of only one color.
White light is made up mostly of ultraviolet and infrared light.
White light is made up mostly of ultraviolet and infrared light.
White light is made up of a spectrum of many different colors.
At one time, all living organisms were separated into only two kingdoms—Animals and Vegetables. Once the microscope was invented and improvements in microscopy were made, however, more kingdoms were defined. The Protist kingdom was established in 1866, and the Monera kingdom was added in 1938.The Monera kingdom was later subdivided into the Eubacteria and Archea kingdoms in the1990s. Fungi were classified as plants until 1969. What is one reason why fungi were separated into a new kingdom?
(1 point)
Responses
Fungi are able to undergo photosynthesis and make their own food. Plants get the nutrients that they need by consuming other organisms.
Fungi are able to undergo photosynthesis and make their own food. Plants get the nutrients that they need by consuming other organisms.
Fungi are prokaryotic. Plants are eukaryotic.
Fungi are prokaryotic. Plants are eukaryotic.
All fungi are unicellular. All plants are multicellular.
All fungi are unicellular. All plants are multicellular.
The cell walls in fungi are composed of chitin. Plant cell walls are composed of cellulose.
The cell walls in fungi are composed of chitin. Plant cell walls are composed of cellulose.
Question
Different seasons arise as the Earth revolves around the Sun because the Earth's axis is tilted. When the Northern Hemisphere is tilted towards the Sun, what seasons will the two hemispheres be experiencing?(1 point)
Responses
Both hemispheres will be in winter.
Both hemispheres will be in winter.
The Northern Hemisphere will be in winter, and the Southern Hemisphere will be in summer.
The Northern Hemisphere will be in winter, and the Southern Hemisphere will be in summer.
The Northern Hemisphere will be in summer, and the Southern Hemisphere will be in winter.
The Northern Hemisphere will be in summer, and the Southern Hemisphere will be in winter.
Both hemispheres will be in summer.
Both hemispheres will be in summer.
The Northern Hemisphere will be in winter, and the Southern Hemisphere will be in summer.
Question
The diagram below shows the lungs, which are the main organs in the respiratory system. What is the main function of the respiratory system?
(1 point)
Responses
to break down food into nutrients that can be circulated throughout the body
to break down food into nutrients that can be circulated throughout the body
to send signals from one part of the body to other parts of the body
to send signals from one part of the body to other parts of the body
to protect the body against foreign substances, such as bacteria and viruses
to protect the body against foreign substances, such as bacteria and viruses
to exchange oxygen and carbon dioxide gases within the body
to exchange oxygen and carbon dioxide gases within the body