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Questions in chemistry

📝 Answered - How many moles of \(\text{Ca(OH)}_2\) are in 25 mL of a 1.5 M solution?

📝 Answered - A(n) ____________ is a substance in which all the exact combinations of elements are always the same. A. synthetic element B. compound C. mixture D. solution

📝 Answered - 14. How do scientists know that the universe is expanding? A. The galaxies are moving away from each other, and the temperatures are decreasing. B. The galaxies are moving away from each other, and the temperatures are increasing. C. The galaxies are moving toward each other, and the temperatures are increasing. D. The galaxies are moving toward each other, and the temperatures are decreasing.

📝 Answered - What was Henri Becquerel studying when he accidentally discovered radioactivity?

📝 Answered - Which of the following is a property of both gases and liquids?

📝 Answered - Calculate the number of moles for each of the following: A. 3.15 g of HNO3 B. 19.3 g of NaCl C. 21.25 g of NaNO3

📝 Answered - What is the alpha decay of Radon-198?

📝 Answered - Calculate the number of moles for each of the following substances: 1. 3.16 g of KMnO₄ 2. 32.33 g of K₂CrO₄ 3. 100 g of KHCO₃

📝 Answered - A chunk of silver has a heat capacity of 42.8 J/°C. If the silver has a mass of 181 g, calculate the specific heat of silver.

📝 Answered - How many grams of [tex]NH_3[/tex] can be produced from the reaction of 28 g of [tex]N_2[/tex] and 25 g of [tex]H_2[/tex]?