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Questions in chemistry

[Terjawab] What do the arrows represent? Solid <--> Liquid <--> Gas

[Terjawab] 6. Chromatography and fractional distillation can be used to separate. In which type of separation is a thermometer needed for checking that complete separation has occurred? A) Chromatographic separation of two colourless solids B) Chromatographic separation of two solids of different colours C) Fractional distillation of two colourless solids D) Fractional distillation of two solids of different colours

[Terjawab] $Fe_2 O_3+3 H_2 O \rightarrow 2 Fe(OH)_3$ The molar mass of each substance is provided in the table below. | Substance | Molar Mass (g/mol) | | :-------------------------------------------------- | :------------- | | Iron (III) oxide $\left( Fe _2 O _3\right)$ | 159.70 | | Water $\left( H _2 O \right)$ | 18.02 | | Iron $($ III $)$ hydroxide $\left( Fe ( OH )_3\right)$ | 106.87 | How many moles of water are needed?

[Terjawab] Regarding the formula $Al_2 O_3$, which of the following is accurate? A) The chemical symbol Al indicates that argon is present in the substance. B) The subscript 2 indicates that two atoms of aluminum are present in the substance. C) The coefficient 3 indicates that there are a total of three atoms of oxygen present in the substance. D) The subscript 2 indicates that two atoms of oxygen are present in the substance.

[Terjawab] 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.

[Terjawab] 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 $\square < \square < \square < \square$

[Terjawab] 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?

[Terjawab] 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.

[Terjawab] 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

[Terjawab] 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.