Question

how to balance an chemical equation
a) H2SO4 + Zn = ZnSO4 + H2
b) Mg + O2 = MgO ​

Answer 1

Answer:

a) 2HSO4 + 2Zn = 2ZnSO4 + H2

b) 2Mg + O2 = 2MgO

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Answer 2

Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g)

This is an oxidation-reduction (redox) reaction:

Zn0 - 2 e- → ZnII

(oxidation)

2 HI + 2 e- → 2 H0

(reduction)

Zn is a reducing agent, H2SO4 is an oxidizing agent

Names: Zinc source: wikidata, accessed: 2019-09-07, Zinc powder (pyrophoric) source: ICSC, accessed: 2019-09-04, Zn source: wikidata, accessed: 2019-09-07

Appearance: Grey-to-blue powder source: ICSC, accessed: 2019-09-04

H2SO4 – Sulfuric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: NIOSH NPG, accessed: 2019-09-02

Other names: Oil of vitriol source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Sulfuric acid, concentrated (> 51% and < 100%) source: ICSC, accessed: 2019-09-04, H2SO4 source: wikidata, accessed: 2019-09-07

Appearance: Clear, colorless liquid source: wikipedia, accessed: 2019-09-27; Odourless colourless oily hygroscopic liquid source: ICSC, accessed: 2019-09-04; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02

Products:

ZnSO4 – Zinc sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04

Other names: White vitriol source: wikipedia, accessed: 2019-09-27, Goslarite source: wikipedia, accessed: 2019-09-27, Zinc sulfate (1:1) source: wikidata, accessed: 2019-09-02

Appearance: White powder source: wikipedia, accessed: 2019-09-27; Colourless hygroscopic crystals source: ICSC, accessed: 2019-09-04

H2

Names: Dihydrogen source: wikidata, accessed: 2019-09-07, Hydrogen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, H2 source: wikidata, accessed: 2019-09-07H₂ source: wikidata, accessed: 2019-09-07, Molecular hydrogen gas source: wikidata, accessed: 2019-09-07, Hydrogen gas source: wikidata, accessed: 2019-09-07, Hydrogen molecule source: wikidata, accessed: 2019-09-07, Molecular hydrogen source: wikidata, accessed: 2019-09-07

Appearance: Odourless colourless compressed gas