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- Multiple ChoicePlease save your changes before editing any questions.The substances at the beginning of a chemical equation are called the ____productyieldchemical symbolreactants
- Multiple ChoicePlease save your changes before editing any questions.In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?Mg and OMgOMg and MgOO and MgO
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following models best demonstrates a balanced chemical equation?FGHJ - Multiple ChoicePlease save your changes before editing any questions.The equation below represents a chemical reaction that occurs in living cells. How many atoms are represented in the reactants of this equation?6
612
1224
2436
36 - Multiple ChoicePlease save your changes before editing any questions.In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?H3PO4H2SO4HCIO3H20
- Multiple ChoicePlease save your changes before editing any questions.Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?The shape of the coal changesOxygen is presentA new substance is producedCoal is made up of more than one element
- Multiple ChoicePlease save your changes before editing any questions.What are Chemical Reactions?It's when you mix substances.a process in which atoms rearrange to form new substancesWhen something bubbles.letter and numbers showing the types and number of atoms
- Multiple ChoicePlease save your changes before editing any questions.Which of the following is NOT evidence that that a chemical reaction has occurred?produces light/heatproduction of a gasformation of a precipitatemelting
- Multiple ChoicePlease save your changes before editing any questions.A different chemical substance is formed when _____.water boilsmetal rustsice meltsrock is crushed
- Multiple ChoicePlease save your changes before editing any questions.A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?cutting a piece of paperfolding a piece of papertearing a piece of paperburning a piece of paper