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Questions in chemistry

📝 Answered - Matter can change from one state to another when energy (usually heat) is added or removed: - Melting: Solid to liquid (e.g., ice melting into water) - Freezing: Liquid to solid (e.g., water freezing into ice) - Evaporation: Liquid to gas (e.g., water turning into steam) - Condensation: Gas to liquid (e.g., steam turning back into water droplets) - Sublimation: Solid directly to gas (e.g., dry ice turning into carbon dioxide gas) C. (COPY AND ANSWER) ACTIVITY NOTEBOOK Directions: 1. Look around your house and find 2 examples of each state of matter: solid, liquid, and gas. 2. List them in the correct column in the table below. 3. Write what you observed that helped you decide the state of matter for each item. | State of Matter | Example from Home | What I Observed | | :-------------- | :---------------- | :------------- | | Solid | 1. | | | | 2. | | | Liquid | 1. | | | | 2. | | | Gas | 1. | | | | 2. | |

📝 Answered - What are the two parts of an atom? A. the nucleus and the proton cloud B. the neutron and the electron cloud C. the neutron and the proton cloud D. the nucleus and the electron cloud

📝 Answered - Under which conditions would the solubility of a gas be greatest? A. high pressure and high temperature B. high pressure and low temperature C. low pressure and high temperature D. low pressure and low temperature

📝 Answered - Which element is a noble gas? uranium, U oxygen, 0 cobalt, Co neon, Ne

📝 Answered - The atomic number and mass number of an element are 15 and 31. a. What is the number of valence electrons in this atom? b. How many neutrons are present in this atom? c. Draw the orbit electron configuration of this atom.

📝 Answered - Which is a characteristic of mixtures? A. They are chemically bonded together. B. They can be classified as pure substances. C. They have fixed ratios between their components. D. They can be separated by physical processes.

📝 Answered - Which reaction is endothermic? A. [tex]HCl + NaOH \rightarrow NaCl + H _2 O +58 kJ[/tex] B. [tex]6 CO _2+12 H _2 O +[/tex] energy [tex] \rightarrow C _6 H _{12} O _6+6 O _2+6 H _2 O[/tex] C. [tex]2 Na + Cl _2 \rightarrow 2 NaCl +[/tex] energy D. [tex]2 C _2 H _6+7 O _2 \rightarrow 4 CO _2+6 H _2 O +2,502 kJ[/tex]

📝 Answered - How many electrons can occupy the shell having [tex]$n=2$[/tex]? A. 18 B. 8 C. 2 D. 6 E. 32

📝 Answered - Predict the products of the following reaction: a. C b. F c. B d. D e. E f. A

📝 Answered - Which statement best explains the change that occurs when gas particles move more slowly? A. The temperature increases because the average kinetic energy decreases. B. The temperature increases because the average kinetic energy increases. C. The temperature decreases because the average kinetic energy decreases. D. The temperature decreases because the average kinetic energy increases.