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- 1. Multiple ChoiceThe substances at the beginning of a chemical equation are called the ____productyieldchemical symbolreactants
- 2. Multiple ChoiceIn the equation, 2Mg + O2 ---> 2MgO, which are the reactants?Mg and OMgOMg and MgOO and MgO
- 3. Multiple Choice
Which of the following models best demonstrates a balanced chemical equation?FGHJ - 4. Multiple ChoiceThe 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 - 5. Multiple ChoiceIn which of these compounds are there twice as many oxygen atoms as hydrogen atoms?H3PO4H2SO4HCIO3H20
- 6. Multiple ChoiceCoal 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
- 7. Multiple ChoiceWhat 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
- 8. Multiple ChoiceWhich of the following is NOT evidence that that a chemical reaction has occurred?produces light/heatproduction of a gasformation of a precipitatemelting
- 9. Multiple ChoiceA different chemical substance is formed when _____.water boilsmetal rustsice meltsrock is crushed
- 10. Multiple ChoiceA 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
- Answer choicesTagsAnswer choicesTags