Many metals react with acids to produce hydrogen gas. A certain reaction produces 32.6 L of hydrogen gas at STP. How many moles of hydrogen were produced?

You see a solid that looks like an ice cube, but it does not melt at room temperature. Can the solid be frozen water? Explain.

Why do two isotopes of an element have the same atomic number but different mass numbers?

An atom has 8 electrons and a mass of 17. What would the correct symbol be? A. 17gF B. 90 C. 25,61 D. 17,0

2 Polnts What do the letters in the boxes of the periodic table represent? A. The letters stand for the names commonly used for the elements. O B. The letters are a one - or two-letter symbol assigned to each element. O C.

1. The element 108/47 Ag has how many protons? A. 108 B. 47 C. 61 D. 107 E. 87 2. The element 238/92 U has how many neutrons? A. 330 B. 238 C. 184 D. 146 E. 92

At standard pressure, during which physical change does the potential energy decrease?

How are inner and outer planets different?

What process do body cells use to divide

Recall the postulates of kinetic molecular theory read the list and check all the statements that apply to behavior of an ideal gas

Which property would cesium most likely have? It is hard. It is ductile. It is a gas. It has low reactivity.