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Questions in chemistry

[Terjawab] Explain the relationship between chemical bonds and energy in the body.

[Terjawab] What kind of mistake has a scientist made if he accidentally spills a chemical that causes invalid conclusions? Is it an honest mistake or a biased mistake?

[Terjawab] Which of the following solutions has the highest pH? Can you also explain how to determine if a solution has the highest pH? a) 1.00 mol/L HNO3 (aq) b) 1.00 mol/L KOH (aq) c) 1.00 mol/L NaCl (aq) d) 1.00 mol/L CaCl2 (aq) At equal concentrations, which of the following solutions is the most conductive? a) C6H12O6 (aq) b) CH3COOH (aq) c) HClO4 (aq) d) CH3OH (aq)

[Terjawab] A compound has 39 g of potassium and 78 g of selenium. What is the mass ratio of potassium to selenium in the compound?

[Terjawab] Which of these statements explains the relationship among elements, compounds, and mixtures? A. Elements are made of compounds and mixtures. B. Both compounds and mixtures are made up of elements. C. Mixtures are made of elements, and elements are made of compounds. D. Compounds are made of mixtures, and mixtures are made of elements.

[Terjawab] True or False: A gas that produces a pop with a burning splint is carbon dioxide.

[Terjawab] True or False A gas that ignites a glowing splint is oxygen.

[Terjawab] 2. Newton began his academic career in 1667. For how long was he a working scientist? Was he a very productive scientist? Justify your answer.

[Terjawab] What is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level? A. \(1.52 \times 10^4 \, \text{J}\) B. \(3.63 \times 10^{-19} \, \text{J}\) C. \(2.18 \times 10^{-19} \, \text{J}\) D. \(4.48 \times 10^{-9} \, \text{J}\) E. \(3.03 \times 10^{-19} \, \text{J}\)

[Terjawab] How many molecules are there in 79 g of [tex]\text{Fe}_2\text{O}_3[/tex]? How many atoms are in this amount?