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Questions in chemistry

📝 Answered - Find the mistake in the chemical equation: \[ \text{C}_2\text{H}_4(g) + 2\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 2\text{H}_2(g) \]

📝 Answered - What is the difference between refraction and rarefaction?

📝 Answered - Which of the following statements is not true about acid rain? a. Acid rain will erode marble statues b. Acid rain can change the pH of lakes and streams c. Acid rain can be formed from carbon dioxide d. Acid rain creates holes in the ozone layer e. Acid rain can be formed from the gases SO₂ and SO₃

📝 Answered - Calculate the number of moles for each of the following: 1. 56.75 g of [tex]$Al(NO_3)_3$[/tex] 2. 8.35 g of [tex]$Al_2(SO_4)_3$[/tex] 3. 3.8 g of [tex]$FeSO_4$[/tex]

📝 Answered - Which statement defines the temperature of a sample of matter? 1. Temperature is a measure of the total electromagnetic energy of the particles. 2. Temperature is a measure of the total thermal energy of the particles. 3. Temperature is a measure of the average potential energy of the particles. 4. Temperature is a measure of the average kinetic energy of the particles.

📝 Answered - Which quantity can vary among atoms of the same element? A. mass number B. atomic number C. number of protons D. number of electrons

📝 Answered - During the operation of a voltaic cell, the cell produces: 1. Electrical energy spontaneously 2. Chemical energy spontaneously 3. Electrical energy nonspontaneously 4. Chemical energy nonspontaneously

📝 Answered - Which substances have atoms of the same element but different molecular structures? A. He(g) and Ne(g) B. K(s) and Na(s) C. O2(g) and O3(g) D. P4(s) and S8(s)

📝 Answered - I don't understand this. In a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a? A. weaker attraction for electrons B. stronger attraction for electrons C. smaller number of first-shell electrons D. larger number of first-shell electrons

📝 Answered - Which elements have the most similar chemical properties? A. Si, As, and Te B. Mg, Sr, and Ba C. N2, O2, and F2 D. Ca, Cs, and Cu Please explain your answer.