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Questions in chemistry

[Terjawab] [CU(H_2O)_4]^{2+} + H_2O \rightleftharpoons Write the equation for the following acting as an acid.

[Terjawab] An atom with [tex]$Z=26$[/tex] and [tex]$A=58$[/tex] contains protons and neutrons. A. 26; 84 B. 26; 58 C. 58; 26 D. 26; 32 E. 32; 26

[Terjawab] Magnesium is an example of a(an) A. alkali metal. B. transition metal. C. halogen. D. noble gas. E. alkaline earth.

[Terjawab] [Cu(H_2O)_4]^{2+} + H_2O. Write the equation for the following species acting as an acid.

[Terjawab] Write a claim, evidence, reasoning statement to answer the questions below based on the measurements and observations recorded during the lab. Questions: 1. How does solubility for a gas vary with temperature? 2. How does solubility for a solid vary with temperature? Some sample data similar to the lab is given below. Oxygen in Water \begin{tabular}{|c|c|} \hline \begin{tabular}{c} Temperature $ left({ }^{\circ} C \right)$ \end{tabular} & \begin{tabular}{c} Concentration $( mg$ solute/ mL solvent \end{tabular} \\ \hline 5 & 0.12 \\ \hline 15 & 0.10 \\ \hline 25 & 0.08 \\ \hline \end{tabular}

[Terjawab] If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction? A. The rate would increase. B. The rate would decrease. C. The rate would remain the same. D. The rate would be zero.

[Terjawab] Write P if it describes Physical Change and C if it describes Chemical Change. 1. Hot bottle cracking when placed in cold water. 2. Digesting food 3. Frying chicken 4. Boiling water for soup 5. Rusting of iron 6. Crumpling of paper 7. Rotting meat 8. Burning of wood 9. Rusts 10. Chopping of fruits

[Terjawab] What does percent composition tell you about a molecule? A. It tells you how the elements are arranged in the molecule. B. It tells you the ratio of elements in the molecular formula. C. It gives you the total number of atoms in the molecule. D. It tells you how much of a molecule is made up of each element.

[Terjawab] Which column of the periodic table contains only nonmetals? A. 7A B. 3A C. 5A D. 4A E. 6A

[Terjawab] Which substance is a compound? A. water B. gold C. oxygen D. hydrogen