Chemistry

Mr. Green gave his students a set of items.They had a toothpick, pencil, paper clip, safety pin, nail, and dime. He also gave them a magnet. He told them to predict which items are magnetic. How can they test their predictions? A. weigh each of the items B. see which items stick to the pencil C. measure each of the items D. see which items stick to the magnet
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Reactions cannot occur without a certain minimum amount of energy. What is this minimum amount of energy called?the activation energythe activated complexthe kinetic energy of reactantsthe potential energy of products
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Nivel de energia maximo de 20Ca
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wsphorus-SL 3. In the isotope B-11, what does the 11 represent?
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When magnesium (Mg) metal is burned in the presence of oxygen (O2), magnesium oxide (MgO) is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide is a compound and cannot be separated __________.
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a volume of .5650 will exert
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NEED HELP ASAP!!!!!!!!! PLEASE ANSWER IN 10 minutes or under What are the two possible benefits of the new plastic bag?
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A mechanical pencil is 14 cm long. What is its length in mm?
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Part 1: Name the type of chemical reaction that occurs when magnesium chloridesolution (MgCl2) reacts with sodium carbonate solution (Na2CO3).Part 2: Explain why aluminum (AI) would react with copper chloride (CuCl2) but not withmagnesium chloride (MgCl2).
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Why is acetic acid called weak acid?
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what element has 12 protons 12 neutrons and 11 electrons
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which colour would you expect ekasilicon to be
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A protozoan gains shelter as it lives in the intestine of a termites, helping the termite to be able to digest the wood that it eats. This symbiotic relationship between the termite and protozoan is known as:
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Which of the following is the strongest covalent bond?Single bondDouble bondTriple bondHydrogen bond
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distinguizh between the 4 states ofmatter
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Elements that are usually dull, brittle and do not conduct electricity are know as______.Points: 46
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How many moles are contained in 127 grams of lead?
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what's the (snowy sour) mixture?
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1) How many moles of hydrogen gas can be produced if 0.57 moles of hydrochloricacid, HCl, reacts with excess solid zinc according to the following chemicalequation?2 HCl + Zn Hz + ZnCl2
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Name the 4 properties of waves.
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The angle formed by the nuclei of two surrounding atoms with the nucleus of the central atom in a structure is called a(n) ________angle. The value predicted for such an angle using the VSEPR theory would be 180 degrees, based upon geometry alone. This is referred to as the___________ bond angle. In practice, this value often deviates from the predicted value for various reasons.
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Calculate the number of moles in 1.622 grams of boron.
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A 0.03 mol sample of NH4NO3 (s) is placed in a 1 L evacuated flask, which is then sealed and heated. The NH4NO3 (s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the following? (The value of the gas constant, R, is 0.082 L atm mol-1 K-1.) a. 3 atm b. 1 atm c. 0.5 atm d. 0.1 atm e. 0.03 atm
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Elements join together to form_____.
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