8th grade Science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| a particle that has a positive charge | proton
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| The fact that an atom is neutral is most closely related to | the number of protons ad electrons the atom contains
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| Electrons involved in bonding between atoms are | valence electrons
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| What is the greatest number of valence elections an atom can have that we've learned about this year? | 3
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| From an elements location in the periodic table you can predict | its properties
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| The elements in a column of the periodic table | are in the same group
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| The elements in a group, or family, of the periodic table have the same | physical properties
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| Across a period of elements in the periodic table, the number of valence electrons | increases from left to right
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| Which process changes matter into one or more new substances | chemical change
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| Water vapor in the air turns to liquid water in the form of rain. This is an example of a | physical change
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| every chemical reaction involves a change in | energy
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| in the following equation what does the number 4 in 4 H2O tell you? 2NH4NO3>2N2+4H2) | The reaction produces 4 water molecules
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| The substance listed on the LEFT side of a chemical equation are the | Reactants
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| in chemical reactions, what does the principle of conservation of mass mean | matter is not created or destroyed
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| Which of the following is a balanced chemical equation | 2Fe2O3+3C>4Fe+3CO2
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| In an equation, numbers often appear in front of a chemical formula. These number (Coefficient) tell you the | number of atoms in each molecule in the reaction
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| A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a | decomposition
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| The chemical reaction between copper oxide and carbon that produces copper and carbon dioxide (CuO + C > Cu + CO2) is an example of | replacement
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| The outside of the space shuttle is protected from extremely high heat during reentry by an outer covering of | ceramic tiles
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| Reactions involving the particles in the nucleus of an atom are called | chemical reactions
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| An object is in motion only if it changes potion relative to | a reference point
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| What is the formula for the speed of an object | speed = distance/time
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| the rate at which the velocity of an object changes is its | acceleration
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| what causes an object to accelerate | a force exerted on it
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| newtons first law of motion states that an object at rest will | remain at rest unless a force is exerted on it
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| the transfer of energy by electromagnetic wave is called | radiation
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| Energy that is transferred by electromagnetic waves in the universe is called | electromagnetic radiation
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| All electromagnetic waves have the same | speed
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| Which electromagnetic waves have the longest wavelengths and lowest frequencies | radio waves
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| visible light has a higher frequency than | infrared rays
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| the range of electromagnetic waves placed in a certain order is called the | electromagnetic spectrum
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| The electromagnetic waves with the highest frequencies are called | gamma rays
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| visible light can be separated into the various colors of the visible spectrum to form | rainbow
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| both reflecting and refracting telescopes are designed to | collect and focus visible light
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| reflecting telescopes differ from refracting telescopes in having | no eye piece lens
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| The hubble Space Telescope | collects visible light from above Earths atmosphere
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| Spectrographs help astronomers determine the | temperature of a star
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| the chemical composition of a star can be determined using a | spectrograph
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| a light year is | the distance light travels in a year
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| parallax is a method used to determine a stars | distance from earth
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| what color are the hottest stars | blue-white
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| The hertz sprung russell diagram shows that main dquence stars | increase in brightness as they increase in temperature
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| all stars begin their lives as parts of | protostars
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| the lifetime of a star depends on its | mass
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| when stars begin to run out of fuel they first become | red giants or supergiants
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| black holes form from the remains of stars that | were more than 40 times the mass of the sun
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| when a white dwarf stops glowing it becomes a | black dwarf
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| how are the elliptical galaxies and spiral galaxies different | elliptical galaxies have little gas and dust
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| the theory that astronomers have developed to describe the beginning of the universe is called the | big bang theory
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| one piece of evidence that supports the big bang theory is the observation that most galaxies are moving | away from one another
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| according to the big bang theory, the universe began about | 10-15 billion years ago
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| the solar system form from | nebula
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| when the solar system formed the spheres that lost most of their gases became the | inner planets
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| day and night are caused by | earth's rotation on its axis
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| one complete revolution of earth around the sun takes about | one year
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| earth has season because | earth's axis is tilted as it moves around the sun
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| when the north end of earth's axis is tilted toward the sun, North America will experience | more direct rays and longer days (summer)
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| an Equinox occurs when | Earth's axis is tilted neither toward nor away from the sun
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| because the moon rotates once for revolution around Earth | you never see the far side of the moon
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| the pass of the moon you see depends on | how much of the moon's surface is lit by the sun
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| from new moon phase to full moon phase you see | an increasing amount of the lighted side of the moon
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| for a solar eclipse to occur | the moon must be directly between Earth and the sun
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| during what phase can a lunar eclipse occur | full
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| you are less likely to see a solar eclipse than a lunar eclipse because | you must be in the moons shadow to see a solar eclipse
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| not every place on Earth has two regular Tides every day because | the shapes of bays, inlets, and the ocean floor can affect the flow of water
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| most places on Earth experience | two high tides and two low tides about every 12.5 hours
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| a spring tide can only at sketch Spring Tide | new moon (the best/highest)
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| How large is the moon's diameter compared to Earth? | about one fourth the diameter of Earth
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| Scientist think the moon was formed when | a large object struck Earth, and material from both bodies combined and was thrown into orbit
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| Galileo thought that the dark, flat parts of the noon's surface were | oceans
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| The moon includes all of the following features EXCEPT | oceans
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| All of the following conditions are needed for life on Earth EXCEPT | one natural satellite that orbits the planet
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| Which of the following is a reason scientists think Mars may have once had life? | Mars has surface features that could have been made by flowing water
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| one complete Revolution of Earth around the sun takes about | one year
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| What is the oxidation number for Lithium | +1
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| An oxidation number of -2 would represent what element | Sulfur
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| The ability to Shine | Luster
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| The Ability to bend without breaking | malleable
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| The ability to transfer | conduction
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| the ability to break easily | brittle
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| you can show the motion of an object on a line graph in which you plot distance against | Time
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| A train that travels 100 kilometers in 4 hours is traveling at what average speed | 25 km/h
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| An example of qualitative observations is | Green
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
cleanmama
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