Select the correct answer. Consider the following equation: hydrogen gas + chlorine gas \( \rightarrow \) hydrochloric acid What are the substances present at the start of a chemical reaction called? reactants products equations coefficients
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In the given equation, these are "hydrogen gas" and "chlorine gas." Show more…
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2. A. Consider the equation, 2H2 + O2 → 2H2O. Here, H2 and O2 are called _____. Group of answer choices reactants products catalysts modules alkalis B. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. This principle is formed in accordance with the _____. Group of answer choices law of identity second law of thermodynamics law of conservation of matter law of attraction of materials third law of thermodynamics C. An unbalanced chemical equation can be balanced by _____. Group of answer choices changing the number of atoms in the product adding oxygen molecules in either sides of the equation changing the mass number of the molecules that react or are produced changing the number of molecules that react or are produced adding hydrogen ions in either sides of the equation D. 2HCl (aq) + Zn(s) → ? Group of answer choices ZnCl + HCl ZnCl2 + H2 ZnCl + H2Cl H2Zn + Cl2 HZnCl2 + H+
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For the unbalanced chemical equation $\mathrm{HCl}(g)+\mathrm{O}_{2}(g) \rightarrow \mathrm{H}_{2} \mathrm{O}(g)+\mathrm{Cl}_{2}(g)$ a. list the reactant(s). b. list the product(s).
Select the coefficients necessary to balance each equation. Choose a coefficient for every compound. 1. ___ CaSO4 + ___ KOH → ___ Ca(OH)2 + ___ K2SO4 2. ___ CaCl2 + ___ Na3PO4 → ___ Ca3(PO4)2 + ___ NaCl
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