Which balanced equation represents a chemical change?

(1) H2O (l) + energy → H2O (g)

(2) 2H2O (l) + energy → 2H2 (g) + O2 (g)

(3) H2O (l) → H2O (s) + energy

(4) H2O (g) → H2O (l) + energy

Examine the following equations. A. 90234Th→91234Pa+-10e+γ B. 2760∗Co→2760Co+γ C. 90234Th→88230Ra+24He D. 614C→714N+-10e In which equation (s) is gamma decay represented? D A A and D C and D C A and B B

A shiny block weighs 34.567 g and measures 3.5 cm in length, 2.0 cm in width, and 1.5 cm in thickness. What is it's volume and density? With work to show

Choose all the right answers. Which terms are concerned with cycles? repetition one time luck accident order design

A 125G sample of water was heated to 100.0°C and then I borrow platinum 20.0°C is dropped into the beaker the temperature of the platinum in the beaker quickly rose 235.0°C the specific heat of platinum is 0.13 j/g°C. The specific heat of water is 4.

Calculate the molar mass of (NH4) 2SO4. molar mass of (NH4) 2SO4=__N*__+__*__+__*__+__ O*__=__ g/mol (total)

The volume of 1 mole of o2 gas at T=273k P=1atm is? A 6.02 x 10^-23 ml B 760 L C 22.4 L D 2.24 L E 224 L

There are two stable isotopes of bromine. Their masses are 78.9183 and 80.9163 amu. If the average atomic mass of bromine is 79.9091 amu, what is the natural abundance of the heavier isotope? percent abundance of 81Br __%

If 1.00 mol of argon is placed in a 0.500-L container at 20.0 ∘C, what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation) ? For argon, a=1.

Which of these is a covalent compound? 1. AICI3 2. CO 3. MgO 4. LiCI

What is a protein used for