Podcast
Questions and Answers
What is the first step in balancing a chemical equation?
What is the first step in balancing a chemical equation?
- Multiply Fe by 3 on the left-hand side
- Balance the hydrogen atoms first
- Check the number of atoms of each element on the reactants and products side (correct)
- Multiply the molecules of H2O by 4
In the equation Fe + 4(H2O) ⟶ Fe3O4 + 4(H2), how many hydrogen atoms are there on the products side?
In the equation Fe + 4(H2O) ⟶ Fe3O4 + 4(H2), how many hydrogen atoms are there on the products side?
- 8 (correct)
- 4
- 16
- 12
Which of the following equations is already balanced according to the text?
Which of the following equations is already balanced according to the text?
- Al + H2SO4 ⟶ AL2(S04)3 + H2
- CO(g) + O2(g) ⟶ CO2(g) (correct)
- ZnCO3 ⟶ ZnO + CO2
- Pb(NO3)2 + KI ⟶ KNO3 + PbI2
What type of reaction is represented by the equation Al + H2SO4 ⟶ AL2(S04)3 + H2?
What type of reaction is represented by the equation Al + H2SO4 ⟶ AL2(S04)3 + H2?
In the equation 4Zn + 10HNO3 ⟶ 4Zn(NO3)2 + 5H2O + N2O, how many molecules of water (H2O) are produced?
In the equation 4Zn + 10HNO3 ⟶ 4Zn(NO3)2 + 5H2O + N2O, how many molecules of water (H2O) are produced?
What is the last step in balancing the equation Fe + 4(H2O) ⟶ Fe3O4 + 4(H2)?
What is the last step in balancing the equation Fe + 4(H2O) ⟶ Fe3O4 + 4(H2)?
What is the black substance formed when silver articles turn black after reacting with hydrogen sulphide?
What is the black substance formed when silver articles turn black after reacting with hydrogen sulphide?
Which phenomenon is involved when silver articles develop a black layer over time?
Which phenomenon is involved when silver articles develop a black layer over time?
What type of decomposition reaction requires energy in the form of heat to break down the reactants?
What type of decomposition reaction requires energy in the form of heat to break down the reactants?
In a decomposition reaction requiring light energy, what type of energy-driven reaction is it known as?
In a decomposition reaction requiring light energy, what type of energy-driven reaction is it known as?
Which compound decomposes into calcium oxide and carbon dioxide when heat energy is supplied?
Which compound decomposes into calcium oxide and carbon dioxide when heat energy is supplied?
What products are formed when the electrolytic decomposition of water occurs?
What products are formed when the electrolytic decomposition of water occurs?
What is the primary reason for using nitrogen gas instead of air to pack food items like potato wafers?
What is the primary reason for using nitrogen gas instead of air to pack food items like potato wafers?
How does rancidity impact food items?
How does rancidity impact food items?
Why is it recommended to avoid keeping cooked food and food materials in direct sunlight?
Why is it recommended to avoid keeping cooked food and food materials in direct sunlight?
Which metal object is particularly susceptible to damage caused by environment factors like oxidation?
Which metal object is particularly susceptible to damage caused by environment factors like oxidation?
What is the color change observed when iron nails are dipped in copper sulphate solution for 30 minutes?
What is the color change observed when iron nails are dipped in copper sulphate solution for 30 minutes?
Why is respiration classified as an exothermic process?
Why is respiration classified as an exothermic process?
