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Questions in chemistry

[Homework Help] What measurements must you make to find the density of a sample of matter?

[Homework Help] If the kinetic energy of a falling apple is 5.2 joules and its potential energy is 3.5 joules, what is its mechanical energy?

[Homework Help] Why do the particles of objects have both kinetic and potential energy?

[Homework Help] How many molecules are in 100 grams of HCl?

[Homework Help] I have an unknown volume of gas at a pressure of 0.5 atm and a temperature of 325 K. If I raise the pressure to 1.2 atm, decrease the temperature to 320 K, and measure the final volume to be 48 liters, what was the initial volume of the gas?

[Homework Help] 12. Which classification describes the Milky Way? A. Regular spiral B. Barred spiral C. Elliptical D. Irregular

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

[Homework Help] What is the difference between refraction and rarefaction?

[Homework Help] 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

[Homework Help] 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]