8. A chain bracelet is found. It looks as though it might be made of either gold or of copper. When the bracelet is submerged in a graduated cylinder containing water, the volume of the water rises from 9.2 cm to 11.7 cm3. The bracelet has a mass of 45 g. Is the bracelet made of gold or copper? (Note: The density of gold is 19.3 g/cm and the density of copper is 8.92 g/cmº.)

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For example Honey is high in viscosity because it does not flow well. But water on the other hand is low in viscosity because it flows well

When determining the age of a victim withing ages 15-22, dental remains provide comparison of the stage of tooth formation shown in X-rays and bone.

Suppose you heat 4.24 g of S8 with 5.00 of Cl2, what would be the theoretical yield of S2Cl2? If the actual yield of S2Cl2 is 6.55g, what is the percent yieldS8 (l) + 4Cl2 (g) ------> 4S2Cl2 (l)

Answer:This reaction will be followed by TLC to monitor the progress of the oxidation. The camphor is then reduced by sodium borohydride to give the isomeric alcohol,

The direction of the force vector depends on the sign of the charges. If the charges are the same, the force points away from the other charge.

It has two isomers; n-butane and isobutane. Here n-butane is a straight-chain compound with four carbon atoms bonded with single covalent bonds. Explanation: Butane is an alkane with four carbon atoms so molecular formula is C4H10.

Rechargeable batteries use a reversible reaction medium to convert electrical current to a form of chemical energy which can be stored for future use.

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We divide thru to get, C:H:O = 3.33:6.65:3.34. When we divide each elemental ratio by the LOWEST number, we get an empirical formula of CH2O, i.e. near enough to WHOLE numbers. Now the molecular formula is always a multiple of the empirical formula; i.e. (EF)n=MF.So 60.0⋅g⋅mol−1=n×(12.011+2×1.00794+16.00)g⋅mol−1.Clearly n=2, and the molecular formula is 2×(CH2O) = CxHyOz.

A student wants to test an unknown chemical solution. What test should they perform to determine whether the chemical is an acid or base? A. Test the solution by testing its conductivity B. Test the solution by increasing its temperature. C. Test the solution by tasting it. D. Test the solution's pH by using litmus paper.

The bracelet displaces the water by [tex]11.7cm^3-9.2cm^3 = 2.5cm^3[/tex] and thus has a volume of [tex]2.5cm^3[/tex]. If the bracelet has a mass of 45g, we know that the density of the bracelet is then [tex]\frac{45g}{2.5cm^3}[/tex], which can be simplified to [tex]18\frac{g}{cm^3}[/tex]. This is closer to the density of gold, so it can be assumed that the bracelet is made of gold.

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Rechargeable batteries use a _________________medium to convert electrical current to a form of chemical energy which can be stored for future use.

[tex]\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{1\text{ mol N$_2$}}{2\text{ mol NH$_3$}} = 6.25\text{ mol N$_2$}[/tex]

Balanced chemical equations are those equation in which each entities are present in same amount on left side as well as on the right side of the chemical reaction.

Hydrogen gas, oxygen gas, and water vapor are collected in eudiometer. The eudiometer contains 0.00206 g of hydrogen, 0.0811 g of oxygen, and 0.0151 g of water vapor. The total pressure is 1101.1 mmHg. Calculate the partial pressure (in mmHg) of hydrogen gas.

The moles have been the mass of the molecule that has been present with respect to the molecular mass of the compound. The number of molecules that have been present in a mole of the compound has been equivalent to the Avogadro number.

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4. In aliens, skin color is a codominant trait. What skin color will the offspring of the following parents have? Parent 1 Parent 2 Nest А B C O A Skin color A (pink) O B. Skin color Byblue) O C. Skin color (pink with blue spots) O D. Skin color D (green)

Based on the chemical equation, to balance the equation we use 2 as a coefficients of HCl on left hand side of reaction.

An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach. Some antacids have been used in the treatment of constipation and diarrhea. Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium.

In the equation below 1. If a sample containing 12.5 moles of NH3 is reacted with excess CuO, how many moles of each product can be made? N2= Cu= H20= thanks!

The resistance and the effort force are used to calculate the mechanical advantage. Arranging the threads of the screw closer together will increase the mechanical advantage. Thus, option C is correct.

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An automobile battery that uses 2520W of power is connected to an electric starter motor. How many joules of energy does the battery deliver to the motor each second?

[tex]\displaystyle 2\text{NH$_3$}_\text{(g)} + 3\text{CuO}_\text{(s)} \longrightarrow \text{N$_2$}_\text{(g)} + 3\text{Cu}_\text{(s)}+3\text{H$_2$O}_\text{(g)}[/tex]

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Two atoms of a single element that differ in number of neutrons are said to represent two distinct ________ of that element. a. isotherms b. atomic species c. isotopes d. isomers

[tex]\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{3\text{ mol H$_2$O}}{2\text{ mol NH$_3$}} = 18.8\text{ mol H$_2$O}[/tex]

Which type of chemical reaction occurs in c6h12 9o2 right arrow. 6co2 6h2o? synthesis combustion single replacement double replacement

Antacids help to treat heartburn (indigestion). They work by neutralizing the stomach acid that causes heartburn. You can buy many antacids without a prescription. Liquid forms work faster, but you may like tablets because they are easy to use.

Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()zn ()hcl → ()zncl2 ()h2

How much energy is given off by the following reaction, if 162.5 g of oxygen reacts with excess ammonia (NH3)? 4 NH3 + 5 O2 + 4 NO + 6 H2O AH = -1225.6 kJ​

When electrical energy from an outside source is applied to a secondary cell (reachargeable battery), the negative to positive electron flow that occurs during discharge is reversed, and the cell's charge is restored. This process is called reversible reaction.

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Above reaction is not balanced equation as number of chlorine and hydrogen atoms are not same, so balanced equation will be:

The closer threads of the screws make the distance covered to be more, and the force applied will be multiplied which will be a mechanical advantage over threads placed far apart.

Mechanical advantage is the ratio of the output force to the input force. It allows easier task performance by obeying the conservation of mass.

Which factor is NOT important when choosing a conversion factor? * •Unit placement of the numerator and denominator (top and bottom) •Changing the value •The value must equal 1 •Equivalent things in the numerator and denominator (top and bottom)

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Thus, rechargeable batteries use a reversible reaction medium to convert electrical current to a form of chemical energy which can be stored for future use.

Particles How many moles of water are in 1.23x1018 water molecules? [ ? ]x10[?] Enter your answer with the correct number of significant figures and be sure the prefix is a number between 1 and 10! а Prefix (green) Exponent (yellow)

A rechargeable battery is a type of battery that can be charged many times by passing electric current through the cells in a reversible reaction.

A sample of a compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. What is the empirical formula of this compound

Gold is an element. Which is true about gold? A. It cannot be broken down into another substance. B. It cannot be bonded together. C. It can be broken down into another

The conversion factor is used to convert values form one unit to another. This operation is common in science when calculations are made that involves units.

Gold is dense, soft, shiny, and most malleable of all the metals known. Gold is a transition metal that is attacked by chlorine, fluorine, and cyanide. Gold is the 79th element in the periodic table. it has 79 protons in its nucleus and 79 outter electrons.