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Questions in chemistry

📝 Answered - Why are cooking utensils usually made of metals?

📝 Answered - Which shows the electron configuration for Silicon (Si)? (A) [Ar]4s 2 3d 10 4p 4 (B) [Ar]3d 1 4s 2 (C) [Ne]3s 2 3p 4 (D) [Ne]3s 2 3p 2

📝 Answered - Carmen is heating some water and trying to measure the temperature of water using a Celsius thermometer. Which measurement can she expect once the water begins to boil? A. $32^{\circ} C$ B. $100^{\circ} C$ C. $212^{\circ} C$ D. $373^{\circ} C$

📝 Answered - $\Al ( NO _3)_3(aq)$ and $Na _3 PO _4(aq)$ $\xrightarrow[\text { Molecular Equation }]{ Al _{\left( NO _3\right)_3( aq )}+ AlPO _4 \quad Na }$ Complete Ionic Equation Net Ionic Equation Spectator Ions

📝 Answered - The combustion of glucose, [tex]$C _6 H _{12} O _6(s)$[/tex], produces carbon dioxide, [tex]$CO _2(g)$[/tex], and water, [tex]$H _2 O ( g )$[/tex], according to the equation below. [tex]$C_6 H_{12} O_6(s)+6 O_2(g) \rightarrow 6 CO_2(g)+6 H_2 O(l)$[/tex] The enthalpy of the reaction is -2,840 kJ. What is the heat of combustion, per mole, of glucose? A. -2,840 kJ / mol B. -473.3 kJ / mol C. 473.3 kJ / mol D. 2,840 kJ / mol

📝 Answered - A student was comparing the solubility of equal amounts of table salt and table sugar at different temperatures. The table below shows the four samples that the student used and the temperature of the water that they were dissolved in. | Sample | Name | Chemical formula | Temperature of water (${ }^{\circ} C$ ) | | ------ | ----------- | ---------------- | ----------------------------------------- | | 1 | Table sugar | $C_{12}H_{22}O_{11}$ | 80 | | 2 | Table sugar | $C_{12}H_{22}O_{11}$ | 45 | | 3 | Table salt | NaCl | 55 | | 4 | Table salt | NaCl | 63 | Which of the samples most likely had the highest solubility? 1. 1 2. 2 3. 3 4. 4

📝 Answered - Draw and label an example of a mixture you can separate using the methods below. | Method of separation | Example of mixture to separate | |---|---| | sieving | | | filtering | | | using a magnet | |

📝 Answered - Which of the following is described by the equation $H _2 O (t) \rightarrow H _2 O (s)+$ heat? A. Evaporating B. Condensing C. Melting D. Freezing

📝 Answered - Make a table and identify the 3 states of matter (Solid, Liquid, and Gas) found in the following: - In your kitchen - In your living room (sala) - In your bathroom Example: 3 states of Matter in the Kitchen Solid - Liquid - Gas -

📝 Answered - 1. Select the correct option: 1. Which is the symbol of mercury? (a) Cu (b) Hg (c) Au (d) Mg 2. Which of the following is a metal? (a) Nitrogen (b) Oxygen (c) Sodium (d) Carbon 3. Which of the following is the most unreactive metal? (a) Iron (b) Lead (c) Aluminium (d) Gold 4. Which of the following is a soft metal? (a) Sodium (b) Cobalt (c) Magnesium (d) Iron 5. Which of the following is a molecule of compound? (a) Ozone (b) Chlorine (c) Water (d) Hydrogen 6. The positively charged particles in an atom are called (a) neutrons (b) electrons (c) protons (d) none of these 7. Which of the following non-metals is found in a liquid state? (a) Iodine (b) Chlorine (c) Bromine (d) Carbon II. State if the following statements are True or False. Correct the false statement. 1. A molecule is the smallest particle of an element. 2. A pure substance consists of particles of only one kind. 3. Mercury is a non-metal. 4. Water is a compound made up of hydrogen and oxygen gas. 5. Constituents of a mixture are present in a fixed proportion.