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Questions in chemistry

📝 Answered - 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?

📝 Answered - 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.

📝 Answered - 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]

📝 Answered - How is the thermal energy of a substance related to its physical state?

📝 Answered - Placing a material in a new location is called _______.

📝 Answered - Name two methods that can be used to break down compounds into simpler substances.

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

📝 Answered - Is melting cheese a physical or chemical change?

📝 Answered - When a car travels around a curve in the road, what helps to keep the car driving in a curved path?

📝 Answered - What type of rock does preexisting rock become?