Chemistry

Shelton measures a temperature of a solution to be 20O degrees C and stirs 5 grams of a substance into the solution. this substance disappears and 10 minutes later the substance of the solution is 80O degrees C.based on his observation, can Shelton conclude a chemical reaction has occurred?A) yes because the substance dissolved in the solutionB) no because the volume of the solution did not changeC) no because there are no color changing solutionD) yes because heat was produced
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. What animal did scientists study to create the brainmachine interface?pls help! Science not chemistry 20 points
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What are the two types of bonding we have studied?a. Metallic and covalentb. Covalent and ionicc. lonic and metallicd. Molecular and metallic
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3. An unknown solution has a pH of 10. Based on the pH scale, the solution can be described as
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What is the relative atomic mass of an elementwhose isotopic composition is 90% of 20x and 10% of 22x
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What is the percent of C inCO2?(C = 12.01 amu, O = 16.00 amu)[? ]%Please help
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The atomic number of a made up element is 413. What else would you know about the element with this information?
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Question 1:How many atoms are in 25.00 g of Li.A. 2.393 x 10^24 atoms of LiB. 1.333 x 10^23 atoms of LiC. 2.16 x 10^26 atoms of LiD. 2.17 x 10^24 atoms of LiQuestion 2:How many grams is 2.393 x 10^24 atoms of CIA. 70.45 g CIB. 140.9 g CIC. 140.9 mole CID. 70.45 mole CIPlease try to answer both questions! Thanks for all the effort :)
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A lab requires 3.50L of a 2.0M solution of HCl. What volume of a 6.0M solution is needed to make this solution?
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PLEASEEEEE ANSWERRR??
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How many grams are in 5 mols of KOH
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A dunk tank holds 550,200 grams of water. How many moles of water are in the tank?
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Someone please help me
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Begin walking at a brisk pace by pushing off of your heels onto your toes. After you feel warmed up (after 1 or 2 minutes), begin jogging at a slow pace (for 2 minutes). Next, run as fast as you can for 2 minutes. Slow down to a jog for 2 minutes. Slow down to a brisk walk for 2 minutes. Describes what? Question 1 options: Progressive walk Progressive Run Running Walking
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please help on this question its the only one i cant do !!
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What causes the difference in density of matter?
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Convert 16.8 L of nitrogen monoxide gas at STP to grams . 1.What is the coefficient of the scientific notation answer ? 2.What is the exponent of the scientific notation answer ? 3.How many significant figures are there in the answer? 4.What is the right most significant figure in the answer ?Convert 12.5 grams of fluorine gas at STP to L. 1.What is the coefficient of the scientific notation answer? 2.What is the exponent of the scientific notation answer? 3.How many significant figures are there in the answer ? 4.What is the right most significant figure in the answer?
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If 3.25 mol of Ar occupies 100. L at a particular temp and pressure, what volume does14.15 mol of Ar occupy under same condition?
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Calculate the pH for the following weak acids.01M Formic acid (HCHO2) aka= 1.7 x 10^-4
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Earth is currently 150 million km away from the Sun. If Earth was 200 million km away from the Sun, why would it no longer be able to support life?
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See if you can think of a way to prove that it is the oxygen in air, not nitrogen, that causes rusting.
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Which equation is correct if thevolume of a block is 64 cm3?A. 5 cm x 5 cm x 5 cm = 64 cm3B. 8 cm x 4 cm x 2 cm = 64 cm3C. 5 cm + 5 cm + 5 cm = 64 cm3D. 8 cm + 4 cm + 2 cm = 64 cm3
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How does photosynthesis happen? (Also can anyone Pay Pal me 2 more dollars for school supplies.
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