A chemist divides a large sample of a mixture into three smaller portions. Each of these portions contains different ratios of the component substances that make up the mixture. Which description best fits the mixture?

A.
compound
B.
element
C.
heterogeneous mixture
D.
homogeneous mixture
E.
pure substance

Which statement about scientific consensus is true?

A.
It represents the beliefs of most scientists.
B.
It is the only way to prove a theory true.
C.
It is necessary to form a hypothesis.
D.
It is an assurance that the interpretations of a study are correct.
E.
It is necessary before research can be published in a science journal.

2. scientific consensus is juding ideas and beliefs of many scientists in a certain topic. B, D, and E are wrong. it leaves A and C. It's going to be A because that's what scientific consensus has 2 do with.

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Dejanras Dejanras · Answer 2 · 2019-01-18T08:39:28+01:00

1) The answer is: C. heterogeneous mixture.

Heterogeneous mixture is not uniform in composition.

This substance is not element or compound, because different components could be observed in the substance.

Pure substance is made of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.

For example, aluminium is an element and ammonia is compound.

This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.

2) The answer is: A. It represents the beliefs of most scientists.

Consensus is general agreement, but not necessarily unanimity.

Consensus is achieved through communication at conferences, the publication process, replication and peer review.

For example, 97 percente of scienties agree that climate warming trends over the past century are extremely likely due to human activities.