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Questions in chemistry

[Terjawab] Why did the heat-treated enzyme behave differently than the non-heated enzyme?

[Terjawab] Why don't all the Group 1 metal carbonates decompose in the lab?

[Terjawab] What is the difference between gymnosperms and angiosperms?

[Terjawab] How many molecules of water are there in a 5.00 g sample of water?

[Terjawab] How many grams of calcium bromide are in 50.0 mL of a 0.25 M calcium bromide solution?

[Terjawab] What is the evidence of a chemical reaction when fireworks go off?

[Terjawab] Particles are arranged in a crystal structure in a sample of: A. \(\text{H}_2\) (g) B. \(\text{Br}_2\) (l) C. \(\text{Ar}\) (g) D. \(\text{Ag}\) (s)

[Terjawab] List four physical properties of each of the following: 1. A piece of copper wire 2. 500g of butter 3. A glass of milk 4. A candle 5. A piece of aluminum foil 6. A spoonful of sugar 7. Toothpaste

[Terjawab] Decode the following message using the atomic number plus the highest principal quantum number: 5, 30, 58, 56, 99, 79, 19, 98, 9

[Terjawab] The standard molar heat of vaporization for water is 40.79 kJ/mol. How much energy would be required to vaporize 30.0 g of water? Answer in units of kJ.