pre lab - chemical reactions and equations

What parts are present in every chemical equation?Select one or more: a) A dot b) At least one subscript c) At least one product d) At least one reactant e) An arrow f) At least one coefficient

c, d, e

Identify the common indicators that a chemical reaction has occurred.Select one or more: a) Precipitate being formed b) Bubbles being produced c) A solid being dissolved d) A change in temperature e) A phase change f) A color change

f, d, b, a

Select the coefficients necessary to balance each equation. Choose a coefficient for every compound. __ NaHCO3 ⟶ __CO2 + __NaOH __CaCl2 + __Na3PO4⟶ __Ca3(PO4)2 + __NaCl

1, 1, 1 3, 2, 1, 6

Select the coefficients necessary to balance each equation. Choose a coefficient for every compound. __CaSO4+__KOH⟶ __Ca(OH)2 + __K2SO4 __CaCl2+__Na3PO4⟶ __Ca3(PO4)2+ __NaCl

1, 2, 1, 1 3, 2, 1, 6

Select the coefficients necessary to balance each equation. Choose a coefficient for every compound. 1. __NH4NO3⟶ __N2O+ __H2O 2. __Fe + __HCl⟶ __FeCl3 + __H2

1. 1 NH4NO3⟶ 1 N2O+ 2 H2O 2. 2 Fe + 6 HCl⟶ 2 FeCl3 + 3 H2

Select the coefficients necessary to balance each equation. Choose a coefficient for every compound. __C2H6+ __O2⟶ __CO2 + __H2O __C2H2 + __O2⟶ __CO2 + __H2O

2, 7, 4, 6 2, 5, 4, 2

Consider the balanced equation of aluminum reacting with sulfuric acid. 2Al+3H2SO4⟶Al2(SO4)3+3H22Al+3H2SO4⟶Al2(SO4)3+3H2 Determine how many atoms of each element are present on each side of the arrow.

Al: 2 H: 6 S: 3 O: 12

For each reaction, determine whether it is an example of combustion or not. a) 2N2O5⟶4NO2+O2 b) C+O2⟶CO2 c) 2C2H6 + 7O2 ⟶4CO2 + 6H2O d) 2NO+O2⟶2NO2 e) CO2+4H2⟶CH4+2H2O

a) not combustions b) combustion c) combustion d) combustion e) not combustion

Predict the products of hydrochloric acid reacting with zinc metal.Select one or more: a) ZnCl2 b) ZnCl c) Cl2 d) HZn e) H2

a, e

Determine whether each equation is balanced as written. C H 4 + O 2 ⟶ C O 2 + H 2 O M g + H 2 S O 4 ⟶ M g S O 4 + H 2 A g N O 3 + N a C l ⟶ N a N O 3 + A g C l C 6 H 12 O 6 + O 2 ⟶ 6 C O 2 + 6 H 2 O 2 H C l + M g ( O H ) 2 ⟶ 2 H 2 O + M g C l 2 H 2 + O 2 ⟶ 2 H 2 O

not balanced balanced balanced not balanced balanced not balanced

In the context of a balanced chemical equation, a ______ is a number to the lower right of an element orion within formula and it applies to ______ A ______ is a number to the left of a formula and it applies to ________ Only ______ should be added or changed when balancing chemical equations.

subscript, only the part of the formula it follows, coefficient, the entire formula it precedes, coefficients

Suppose you mix two solutions in a test tube and the test tube becomes hot. This is ____ because ______

a sign of chemical reaction, chemical changes can release heat

Identify the meaning of each chemical equation symbol. a) (l) b) ⟶ c) + d) Δ→

a) Substance is liquid b) substances on the reactants side are converted to the substances on the products side c) There are two separate substances on either the products side or the reactants side d) Heat is applied

Determine whether each observation generally corresponds to a physical change or a chemical change. a) Bubbles are produced upon mixing two solutions. b) A precipitate is formed from two solutions. c) A liquid freezes into a solid. d) A solution heats up upon mixing with another. e) A solid dissolves into water. f) The color of a substance changes over time.

a) chemical change b) chemical change c) physical change d) chemical change e) physical change f) chemical change

Determine each type of reaction a) NH4NO3(s)⟶N2O(g)+2H2O(l) b)2Fe(s)+6HCl(aq)⟶2FeCl3(aq)+3H2(g) c)CO(g)+2H2(g)⟶CH3OH(l) d)CaCl2(aq)+Na2CO3(aq)⟶2NaCl(aq)+CaCO3(s) e)2C2H2(g)+5O2(g)⟶4CO2(g)+2H2O(l)

a) decomposition b) single displacement c) synthesis d) double displacement e) combustion