What do scientists mean when they speak of a phase or state of matter?

1.) Why does carbon form covalent bonds? It tends to pull 4 electrons from another atom. It tends to release 4 electrons to another atom. It will usually bond to multiple atoms which can provide a total of 4 additional electrons.

What is the mass of ammonium nitrate in 250 mL of a 75% by mass solution (density = 1.725 g/mL) ?

What are two household appliances that use an electric motor? What does the motor make happen in each appliance?

What is the pressure exerted by 0.801 mol of co2 in a 13.0 l container at 298 k? Express your answer in atm.

How many protons are in the nucleus of the isotope in-115?

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How many atoms of oxygen are in 0.100 miles of silicon dioxide, SiO^2

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A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel (II) ion solution and another electrode composed of copper in a 1.0 M copper (I) ion solution, connected by a salt bridge.

What is the molality of a solution made by dissolving 137.9g of sucrose in 414.1g of water?