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Questions in chemistry

[Answered] How do you find the volume occupied by 454 grams of copper if the density is 8.92 g/mL?

[Answered] What is the reaction if you mix vinegar, Ajax, and bleach together?

[Answered] Complete the equation: Fe + HOH = ?

[Answered] An object has a weight of 5.10 Newtons (N) at sea level, where the acceleration due to gravity is 9.81 m/s2. What is the acceleration due to gravity on the object of it is placed in a space ship 1,000 km above sea level, where gravity exerts a force of 3.81 N on the object. F(newtons)=m(kg) x a(m/s2) Please show work.

[Answered] Which type of seismic wave produces the most severe ground movement?

[Answered] **Background Info:** The standard enthalpy of formation \((\Delta H^\circ_f)\) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 °C, and all species present at a concentration of 1 M. A "standard enthalpies of formation table" might look something like this: | Substance | \(\Delta H^\circ_f\) (kJ/mol) | |-----------|-------------------------------| | H(g) | 218 | | H\(_2\)(g)| 0 | | Ba(s) | 0 | | Ba\(^{2+}\)(aq) | −538.4 | | C(g) | 71 | | C(s) | 0 | | N(g) | 473 | | O\(_2\)(g)| 0 | | O(g) | 249 | | S\(_2\)(g)| 129 | **Question:** What is the balanced chemical equation for the reaction used to calculate \(\Delta H^\circ_f\) of BaCO\(_3\)(s)? If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for aqueous solution. **EXPRESS ANSWER AS A CHEMICAL EQUATION.** Please explain for me too!

[Answered] Fill in the blanks to balance the equation: \[ \_\_\_ \text{Na}_3\text{PO}_4 + \_\_\_ \text{KOH} \rightarrow \_\_\_ \text{NaOH} + \_\_\_ \text{K}_3\text{PO}_4 \] How do I balance this equation?

[Answered] Why can't you change the subscripts in a formula in order to balance a chemical equation?

[Answered] Two of the emission wavelengths in the hydrogen emission spectrum are 410 nm and 434 nm. One of these is due to the [tex]n=6[/tex] to [tex]n=2[/tex] transition, and one is due to the [tex]n=5[/tex] to [tex]n=2[/tex] transition. Which wavelength corresponds to which transition, and why?

[Answered] In relation to the Earth's surface, explain where rocks spend most of their time.