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Questions in chemistry

[Homework Help] When 5.175 g of lead are heated at 300°C, the lead reacts with the oxygen in the air to produce 5.708 g of an oxide of lead. This is the only product. What is the equation for this reaction?

[Homework Help] 1) The attraction forces between mercury atoms in liquid mercury are stronger than the intermolecular forces between water molecules. Which of the following is most likely true about mercury? A) It has a higher surface tension than water. B) It exhibits greater capillary action than water. C) It is very soluble in water.

[Homework Help] Please help balance the following chemical equations: 1. [tex]\text{Na}_2\text{SO}_3 + \ldots = \text{H}_2\text{SO}_4[/tex] 2. [tex]\text{CaSO}_3 + \ldots = \text{H}_2\text{SO}_4[/tex] 3. [tex]\text{SO}_2 + \ldots = \text{MgSO}_3[/tex] 4. [tex]\text{Ca}_3(\text{PO}_4)_2 = \text{P}[/tex] 5. [tex]\text{H}_3\text{PO}_4 + \ldots = \text{Ca(H}_2\text{PO}_4)_2[/tex] 6. [tex]\text{P} + \ldots = \text{Mg}_3\text{P}_2[/tex] 7. [tex]\text{SiO}_2 + \ldots = \text{Mg}_2\text{Si}[/tex]

[Homework Help] How is the thermal energy of a substance related to its physical state?

[Homework Help] Placing a material in a new location is called _______.

[Homework Help] Name two methods that can be used to break down compounds into simpler substances.

[Homework Help] Find the mistake in the following chemical equation: \[ \text{Cu(NO}_3\text{)}_2(s) + \text{CuO}(s) \rightarrow 2\text{NO}(g) + \text{O}_3(g) \]

[Homework Help] Is melting cheese a physical or chemical change?

[Homework Help] When a car travels around a curve in the road, what helps to keep the car driving in a curved path?

[Homework Help] What type of rock does preexisting rock become?