During which phase change will two grams of water

release 668 joules of heat energy?

A. melting

B.

freezing

C.

vaporization

D. condensation

Alyssa is trying to balance the following equation: Pb (OH) 2 + 2H2SO4 = > PbSO4 + 2H20 What number should be used to replace the question mark (?) shown in the equation above to balance it? O a. 3 O b. 1 Oco O d. 2 Oe. 4

Calculate the mass of NaCl required to prepare 0.5 liters of a 2.5 molar solution of NaCl. 11 Na 22.99 Sodium 17 Cl 35.45 Chlorine A. 37.1 g B. 54.7 g C. 73.1 g D. 112.1 g

How many moles of glucose are contained in 8.3 x 10^21 molecules of glucose

Ca (OH) 2 + H2SO4 ⟶2H2O + CaSO4 What volume of 1.45 M Ca (OH) 2 is needed to react with 25.0 moles of H2SO4?

Diffusion bonding can be used to join (check the reference book before answer) : Group of answer choices Only metals, but the metals can be dissimilar Most combinations of metals and/or ceramics Only ceramics Only similar metals

Where should you keep your glass of soda if you want it to remain fizzy

Why do the atoms in a piece of copper metal have no net charge? -The charges of the positive and negative copper ions cancel each other out. -The number of electrons surrounding each copper nucleus doesn't change.

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).

What compound will not give oxygen on heating

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?