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The amount of matter present before a change is the same as the amount present after a change. This principle is called
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
What happens during the chemical reaction shown by this equation? Mg+Br2 -=MgBR2
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
Matter composed of two or more pure substances is always
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
Two populations have developed into two species when
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
Which of the following would most help Marie keep thorough and accurate records for her science project?
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
Which of the following applies to a correctly balanced chemical equation?
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
Three species of birds on an island. Bird A has a heavy bill for eating seeds. Bird B has a pointed bill for eating insects. Bird C has a sharp bill for eating insects and seeds. If all insects suddenly disappeared, which would be least affected
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
A scientist notices that lichen are growing only on 1 side of all of the rocks in an area. How might the scientist test her idea that the lichen's growth pattern depends on the position of the growing surface?
Place new lichen-free rocks in the area in different positions and observe whether lichens grow on a particular side of each
the law of conservation of mass
writing all her observations in a single laboratory notebook
a mixture
Bird A
a metal and a nonmetal form a salt
products and reactants have the same number of atoms for each element
the populations can no longer interbreed
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