Química preguntas y respuestas

A statement about mass always being conserved in a chemical reaction is an example of a hypothesis theory law

Which is of the following is an example of a chemical property? water boils at \( 100^{\circ} \mathrm{C} \) acids are sour and bases are bitter an iron nail rusts

10. In chemistry, the pH of a substance is defined as \( p H=-\log \left[H^{+}\right] \), where \( \boldsymbol{H}^{+} \)is the hydrogen ion concentration in moles per liter. Tomatoes have a hydrogen ion concentration of \( 6.3\left(10^{-5}\right) \); what is the pH of tomatoes?

Question 10 of 10 What is the hybridization of the carbon in \( \mathrm{CO}_{2} \) and bond order of the \( \mathrm{CO}_{2} \) molecule?

\( CH _ { 4 } + O _ { 2 } \rightarrow \)

\( H _ { 3 } C _ { 6 } H _ { 5 } O _ { 2 } + 3 NaOH \rightarrow Na _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + 3 H _ { 2 } O \)

\( \left. \begin{array} { l } { H _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + 3 NaOH \rightarrow Na _ { 3 } C _ { 6 } H _ { 5 } O _ { 7 } + 3 H _ { 2 } O } \\ { \frac { 0,1 moles NaOH } { 1 L } \times 2 mLL \times \frac { 1 L } { 1000 } = 0,002 moles NaO } \end{array} \right. \)

4. A sample of oxygen is collected over water at \( 25.0^{\circ} \mathrm{C} \). The barometric pressure is 717.0 mmHg . What is the pressure of the oxygen gas in atm? (0.9121 atm)

Postlab Questions 1. a. Write the balanced chemical equation (with state descriptors) for the reaction between sodium carbonate and hydrochloric acid.

It is required to collect 95 mol\% of methanol as a condensate from a process stream containing an equimolar ratio of methanol and toluene. Toluene is collected as a bottoms product. Crude oil is required to be heated to \( 1400^{\circ} \mathrm{C} \) before it is sent to a catalytic reactor to crack the carbon chain bonds of the crude to produce petrochemicals. [1] A volume of air needs to be compressed to 5 bars from atmospheric pressure so that it can be delivered to a chemical process. A unit for the reaction of copper and nitric acid to produce copper nitrate. [1] Dusty air from a factory needs to be cleaned before it is exhausted to the atmosphere by using a cylinderical vessel, where dust particles fall down and are collected in a hopper and clean air escapes at the top of the vessel. Large particles of limestone from a nearby quary needs to have its size reduce to fine powder to produce cement.