Which of the following is a chemical change?

breaking a pencil

freezing water

rusting of an iron nail

liquid nitrogen becoming a gas

Which element has the most metallic character, silicon sodium sulfur or thallium?

You're talking on your cell phone in your bedroom, when suddenly the reception goes bad for a minute. Just before the reception clears up, you hear the microwave beep in the kitchen. What's your hypothesis of what has happened?

Practice of leaving the stalks of crops in the ground to anchor topsoil

A 15.0 kg chunk of ice falls off the top of an iceberg if the chunk of ice Falls 8.00 to the surface of the water what is the kinetic energy of the chunk of ice when it hits the water and what is its velocity how do you work that out

How many chlorine atoms are in 5.0 g chloral hydrate?

Consider the following half-reactions: Half-reaction E° (V) I2 (s) + 2e - 2I - (aq) 0.535V 2H + (aq) + 2e - H2 (g) 0.000V Zn2 + (aq) + 2e - Zn (s) - 0.

Where did the longest tsunami form?

Calculate the number of H atoms in 0.190 mole C 6 H 14 O .

What fuel is produced by the electrolysis of water? chlorine gas hydrogen gas natural gas oxygen gas

Model describe how you would show j. j. thomson's model of the atom using small beads and clay