A goldsmith wants to change the composition of 10 g 18K red gold (75% gold and 25% copper) into 60% gold and 40% copper. How many g of copper the goldsmith has to add to the original red gold

Q: A 25.1 g25.1 g sample of magnesium reacts with excess silver nitrate to produce silver metal and…

A: Mass of magnesium = 25.1 gTotal mass of solid metal after reaction = 61.3 g Molar mass of magnesium,…

Q: You are drying a sample of Ba3(PO4)2. After 5 minutes of drying it weighs 1.2034 g. You continue to…

A: Answer: Percent change in mass will be the ratio of change in mass with initial mass, therefore %…

Q: Platinum is a precious metal that is used as a catalyst for many important industrial reactions.…

A:

Q: A chemist prepares a solution of iron (II) chloride (FeCl₂) by measuring out 33. mg of FeCl₂ into a…

A: According to the question, The mass of the FeCl2 = 33 mg The volume of the solution = 50 mL   Find:…

Q: In the room, the police also found a suspicious amount of CO2 in the air, which is produced when…

A: Combustion reactions of methanol is 2CH4O+3H2O→2CO2+4H2O 2 mole of methanol is producing 2 moles of…

Q: One of the following compounds is much more stable than the other two. Classify eachas aromatic,…

A: A compound should be cyclic, planar in shape and having (4n+2)pi electron conjugated system is…

Q: empirical formula of tin (Sn) oxide,

A:

Q: 4. How sizing down to Nano affect material properties?

A: Since  substances at the nanoscale level have a greater surface-to-volume ratio, which causes them…

Q: If you have 10 pieces of bread, 20 slices of ham, and 4 slices of cheese, how many sandwiches can…

A:

Q: Another student performed the same percent composition of a hydrate experiment, but kens the…

A: 3a. The experiment was the determination of percent composition of hydrate.

Q: A molecule has a mass of 4.65 x 10^-23 g. Provide two possible chemical formulas for such a…

A: Given  mass of 1 molecule = 4.65 x 10-23 g we know  mass of 1 molecule = 1 mole  1 mole = 6.022 x…

Q: One molecule of a compound weighs 2.03 × 10‒22g. What is its molar mass?

A: Molar mass is the mass of 1 mole of the substance or 6.022×10²³ particles, expressed in grams.

Q: A geochemist measures the concentration of salt dissolved in Lake Parsons and finds a concentration…

A: The amount of solute which is dissolved in given amount of solvent is known as concentration.

Q: Gaseous methane (CH4) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide (CO₂)…

A:

Q: 9.66 x 10-3 grams of CaCO3 were present in a 5.00 mL sample of water, how many grams of CaCO3 are in…

A:

Q: n. is the total mass of solid recovered? g is the percent composition of naphthalene in the initial…

A: A) 1.661gm B)21.06% C)15.73%

Q: Liquid octane (CH₂(CH₂) CH3) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide…

A: Limiting reactant - Reactant species which react completely or present in less amount in reaction.…

Q: Silane, SiH4, is prepared according to the following equations: Si(s)  +  3 HCl(g)  →  HSiCl3(l)  +…

A: Si(s)  +  3 HCl(g)  →  HSiCl3(l)  +  H2(g) 4 HSiCl3(l)  →  SiH4(g)  +  3 SiCl4(l)  2.42 moles of…

Q: Emissions from the burning of fossil fuels are often reported as gigatons ( Gt ) of carbon. In a…

A: Given that : Amount of carbon emitted by China = 2.9 Gt Amount of carbon emitted by United States =…

Q: One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is…

A: Hi, as you have posted 2 questions and have not mentioned which one you want us to solve for you.…

Q: Calculate the number of magnesium atoms in a 130.0 g sample of forsterite (Mg₂SiO4). Be sure your…

A:

Q: How many grams of carbon are in 7.25 mL of butane (C4H10)? (density of butane = 0.601 g/cm^3)

A:

Q: Platinum is a precious metal that is used as a catalyst for many important industrial reactions.…

A:

Q: themist prepares a solution of potassium chloride (KCl) by measuring out 43. mg of KCl into a 50. mL…

A:

Q: Aspirin can be prepared from salicylic acid (C7H6O3), which has a molar mass of 138.12 g/mol, and…

A: Given reaction: C7H6O3+C4H6O3⟶C9H8O4+C2H4O2 We have to find the yield of aspirin when 2.10 g of…

Q: A 480-pound alloy (which is just a mixture of metals ) containing 30% silver was mixed with an alloy…

A: Mass of alloy with 30% silver = 480 pound Mass of alloy with 55% silver taken = x pound % silver in…

Q: A sample of ammonium carbonate (MM = 96.09 g/mol) was found to contain 7.6 x 1023 AMU of N. How many…

A:

Q: Chemical Formulas as Formulas: Converting between Grams of a Compound and Gram of a Constituent…

A: First convert given mass in kg  into grams .

Q: Question 11: You are a gemstone expert studying samples of various materials. Gemstone Hambergite…

A: From the given gemstones, the most massive gemstone is = Smoky Quartz (density = 2.65 g/mL) The…

Q: Assuming gasoline to be pure 2-methylhexane, C7 H16 (actually, it is a mixture of many substances),…

A: Molecules consumed per mile =  5.96 x 1023 molecules We need to find the mass of fuel.

Q: A chemist prepares a solution of potassium bromide (KBr) by measuring out 1.75 g of KBr into a 250.…

A: Mass of KBr = 1.75 g  Volume of solution = 250 mL = 0.25 L

Q: 22.00 g sample of nitric acid (HNO3) has a purity of 96.20% by mass. Calculate the following: the…

A:

Q: Fill in the Blanks Chemical Price/kg (in dollars) NaOH 21.17 CaCl2 41.28 КОН 31.38 CuSO4 93.32…

A: Solution is provided in the image below.

Q: A 23.4 g23.4 g sample of magnesium reacts with excess silver nitrate to produce silver metal and…

A: Given : Mass of magnesium metal i.e Mg taken = 23.4 g And the mass of final mixture of metals = 62.6…

Q: Lithium metal has an atomic radius of 152 pm. The molar mass of lithium is 6.94 g/mol and Avogadro`s…

A: Atomic radius = 152 pm = 152 × 10-10 cm  Avadagro constant = 6.022 × 1023  per mol  Molar mass of…

Q: 5) King Krator the Merciless has called on Pogo, a humble goldsmith, to make a crown for the King.…

A: The mass of gold given by King Krator to gold Smith Pogo is ---- 14 oz. The density of gold=19.3…

Q: Willa weighs a clean, dry, empty crucible and finds it to have a mass of 95.83 g. After putting a…

A:

Q: A chemist adds 110.0 of a 1.63 molcalcium bromide (CaBr 2 ) solution to a reaction flask Calculate…

A: I assume what the chemist added is: 110.0 mL of a 1.63 mol/L (or 1.63 M) calcium bromide (CaBr2)…

Q: Silane, SiH4, is prepared according to the following equations: Si(s)  +  3 HCl(g)  →  HSiCl3(l)  +…

A: Given data, Moles of Si = 2.51moles Given equations: Si(s)  +  3 HCl(g)  →HSiCl3(l)  +  H2(g)…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.