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On the periodic table, chromium has the symbol Cr, an atomic number of 24, and a mass number of 52. How many protons does chromium have?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
Several exploration vehicles have landed on Mars and have sent information back to scientists on Earth. Which characteristic changed after the vehicles landed on Mars?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
The planets in our solar system stay in their orbits because of the __________.
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
Carrie tests the stream behind her house each year to find out if the water quality has changed. This year, the water in the stream had a pH of 6.0 according to the pH meter. What describes the pH of the water in the stream?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
Hernando ran an electric current through a beaker of distilled water and separated the water into the gases H2 and O2. What type of change did he produce?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
Why does Earth have a greater gravitational pull than the Moon?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
Which objects could be combined to make a device that woul produce electricity?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
Earth's atmosphere is made up of several gases. Which gas makes up over 75% of Earth's atmosphere?
The vehicles weighed much less on Mars.
24
The Moon orbits the Earth.
nitrogen
slightly acidic
chemical change
a magnet and a coil of copper wire
force of gravity on their masses
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