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Questions in chemistry

[Answered] CO(g) + Br₂(g) ⇌ COBr₂(g) The cost of CO is $11/kg and the cost of Br₂ is $26/kg. The profit from selling COBr₂ is $23/kg. Determine if the process is profitable. Options: 1. Yes, it is profitable since CO and Br₂ sell for more than the cost of COBr₂. 2. No, it is not profitable since CO and Br₂ sell for less than the cost of COBr₂. 3. Yes, it is profitable since COBr₂ sells for more than the cost of CO and Br₂ combined. 4. No, it is not profitable since COBr₂ sells for less than the cost of CO and Br₂ combined.

[Answered] Drag each tile to the correct box. Arrange the elements in order of increasing atomic radius. Use the periodic table to help you. Mg Ba F S $\square < \square < \square < \square$

[Answered] Mixture A contains a mixture of chemical S and it contains 60% of chemical S. Mixture B contains the mixture of chemical U and T in the ratio of 7:2. If two mixtures A and B are mixed together in the ratio of 5:3, then find the ratio of chemical S to T in the resultant mixture?

[Answered] Four different thermometers were used to measure the temperature of a sample of impure boiling water. The measurements are recorded in the table below. | Thermometer | Temperature Reading 1 | Temperature Reading 2 | Temperature Reading 3 | | :---------- | :-------------------- | :-------------------- | :-------------------- | | w | $100.1^{\circ} C$ | $99.9^{\circ} C$ | $96.9^{\circ} C$ | | X | $100.4^{\circ} C$ | $102.3^{\circ} C$ | $101.4^{\circ} C$ | | Y | $90.0^{\circ} C$ | $95.2^{\circ} C$ | $98.6^{\circ} C$ | | Z | $90.8^{\circ} C$ | $90.6^{\circ} C$ | $90.7^{\circ} C$ | The actual boiling point of pure water is $100.0^{\circ} C$. What can be concluded from the data about the reliability and validity of the thermometers? A. Thermometer $Z$ is the most reliable. B. Thermometer $X$ has the highest validity. C. Thermometer $W$ is the most reliable. D. Thermometer Y has the highest validity.

[Answered] Select all that apply. Chemistry is the study of: A. the forces that act on objects B. the reactions between substances C. matter D. the movement of objects

[Answered] Select the correct answer. How does adding oxygen [tex]$\left( O _2\right)$[/tex] to this reaction change the equilibrium? [tex]$2 SO_2(g)+O_2(g) \rightleftharpoons 2 SO_3(g)$[/tex] A. The equilibrium shifts right to produce more [tex]$SO _3$[/tex] molecules. B. The equilibrium shifts left to produce more [tex]$O _2$[/tex] molecules. C. The equilibrium shifts right because of decreased collisions between [tex]$SO _2$[/tex] and [tex]$O _2$[/tex] molecules. D. The equilibrium shifts left with an increase in [tex]$SO _2$[/tex] and [tex]$O _2$[/tex] molecules. E. The equilibrium shifts left because of increased collisions between [tex]$SO _2$[/tex] and [tex]$O _2$[/tex] molecules.

[Answered] Which of the following is a proper safety precaution when transporting nitrogen cylinders? A. All answers are correct B. Use an approved cart C. Secure the cylinder D. Ensure the cap is secured on the cylinder

[Answered] Sodium hydroxide $(NaOH)$ was added to pure water $(H_2O)$. Which most likely were the pH values of the water before and after the sodium hydroxide was added to it? A. before = 7, after = 9 B. before = 7, after = 4 C. before = 4, after = 7 D. before = 9, after = 7

[Answered] Which is an important safety precaution to be followed when working with refrigerants? A. Never expose refrigerant vapors to an open flame or direct heat source B. Never use a torch to raise the pressure in a refrigerant cylinder C. Ensure the area is well ventilated D. All answers are correct

[Answered] Which metallic component of firearm discharge residues could not be detected using: A. barium B. antimony C. lead D. carbon