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AVCN

Authored by Na Nguyễn Thị Cẩm

English

University

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AVCN
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42 questions

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1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Specialized proteins called enzymes accelerate chemical reactions in living systems by ………………. the activation energy.

increasing

lowering

raising

generating

2.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The Latin prefix "sesqui-" means: *

one

one half

double

one and a half

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

An ……………….. substance is a substance which consists of atoms of only one kind.

elementary

compound

molecule

impure

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The products of reversible reactions can readily revert back to form the …………… reactants.

new

joined

original

combined

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The bond between Na+ and Cl in the salt molecule is called …………... bond.

covalent

ionic

disulfide

hydrogen

6.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

In a synthesis reaction, atoms, ions, or molecules are ………. to form a large molecule.

broken down

combined

release

generated

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Chemical elements are designated by letter abbreviations called chemical ………... .

symbols

atoms

signs

molecules

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