Misc. 7th Gr Science Review 3: Question Preview (ID: 5968)


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Which statement about the atoms of a chemical element is TRUE?
a) The atoms of a chemical element do not break down in chemical reactions b) The atoms of a chemical element can break down when heated c) The atoms of a chemical element can break down when mixed with an acid d) The atoms of a chemical element can break down when exposed to an electric current
Which of these never changes during a chemical change?
a) the total number of atoms b) the arrangement of atoms c) the total number of molecules d) the colors of the reactants
Suppose an unbalanced force acts on an object. An unbalanced force can change
a) both the speed and direction of a moving object b) the speed but never the direction of a moving object c) the direction but never the speed of a moving object d) neith the speed nor the direction of a moving object
Which of these do geologists consider a constructive force?
a) a river carving out a valley in a plain of rock b) a glacier grinding stones into dust c) a volcano blasting ash into the air d) a tsunami sweeping away acres of marshland
Which of these statements is correct?
a) The moon revolves around the earth and the earth revolves around the sun. b) The earth rotates around the moon and the moon rotates around the sun c) The earth revolves around the moon and the moon revolves around the sun. d) The moon rotates around the earth and the earth rotates around the sun
The tides are caused mainly by
a) the moon's gravity b) the moon's phases c) the earth's rotation d) the earth's winds
The human body has levels of organization. Which is the MOST complex?
a) organ system b) cell c) organ d) tissue
Which cell component can you see only in a plant cell?
a) cell wall b) cell membrane c) mitochondrion d) nucleus
Genes code for inherited traits. Which BEST describes a gene?
a) a section of a DNA molecule b) a chromosome c) a small protein molecule d) a carbohydrate molecule
In which rock type are you MOST LIKELY to find fossils and evidence of past climates?
a) sedimentary b) igneous c) granite d) metamorphic
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