Recent questions tagged chemical-formulae

If $Ca(OH)_2$ is dissolved a solution of $NaOH$ its solubility , compared with that in pure water , is

asked Oct 25, 2018 by meena.p

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A change in which of these conditions will change the K of an equilibrium given as a starting point ?

asked Oct 25, 2018 by meena.p

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The PH of a solution that has a hydrogen ion concentration of $1 \times 10^{-4}\;mole/liter$ is

asked Oct 25, 2018 by meena.p

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If the $k_{sp}$ of radium sulfate , $RaSO_4$ is $4 \times 10^{-11}$, Calculate the solubility of the compound in pure water. Let x = moles of $RaSO_4$ that dissolve per liter of water. Then , in the saturated solution ,

asked Oct 25, 2018 by meena.p

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Silicon dioxide, made up of elements silicon and oxygen, contains 46.7% by mass of silicon. With what mass of oxygen will 10 g of silicon combine?

asked Oct 25, 2018 by meena.p

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In the Haber process for making ammonia , an increase in pressure favors

asked Oct 25, 2018 by meena.p

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A small value for K , the equilibrium constant , indicates that

asked Oct 25, 2018 by meena.p

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The PH of a solution that has a hydroxide ion concentration of $1 \times 10^{-4}$ moles /liter is

asked Oct 25, 2018 by meena.p

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The concentration in an expression of the equilibrium constant are given in

asked Oct 24, 2018 by meena.p

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For the reaction $A+B =C+D$ , the equilibrium can be expressed as :

asked Oct 24, 2018 by meena.p

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Electrolysis of water is

asked Oct 16, 2018 by meena.p

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A reaction for which heat must be removed from the system to maintain isothermal condition is called

asked Oct 16, 2018 by meena.p

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The energy of a system plus surrounding can neither be created nor destroyed, Is the law of

asked Oct 16, 2018 by meena.p

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If the kg amount of both the reactants is doubled. What is the extent of the reaction?

asked Oct 16, 2018 by meena.p

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If 5 moles of N2 is combined with 12 moles of $H_2$ as per given reaction. $N_2 + 3 H_2 → 2 NH_3$

asked Oct 16, 2018 by meena.p

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Extent of a reaction denotes

asked Oct 16, 2018 by meena.p

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Which one is not a dimension?

asked Oct 16, 2018 by meena.p

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How many significant figures are there in 0.002000?

asked Oct 16, 2018 by meena.p

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Number of digits that are reasonably sure, called significant figures. Above given definition is

asked Oct 16, 2018 by meena.p

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A student combines 154 grams of carbon tetrachloride and an unknown quantity of bromine in a sealed container to produce 243 grams of dibromodichlormethane and 71 grams of chlorine. How much Bromine was used in the reaction, assuming the reactants are completely used up?

asked Oct 16, 2018 by meena.p

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Which of the following equations does NOT demonstrate the law of conservation of mass?

asked Oct 16, 2018 by meena.p

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A __________________ chemical equation shows that the same numbers of atoms in the reactants are also in the product.

asked Oct 16, 2018 by meena.p

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The following word equation describes a chemical reaction in which hydrogen is produced. magnesium + hydrochloric acid - magnesium chloride + hydrogen What is the source of the atoms in the hydrogen gas produced by this reaction?

asked Oct 16, 2018 by meena.p

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Examine the following chemical equation, which shows only the reactions and one product. $Zn + 2HCl - ZnCl_2 + ?$ How many H atoms must be present in the second product that is formed?

asked Oct 16, 2018 by meena.p

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In a chemical reaction, the mass of the products always __ the mass of the reactants.

asked Oct 16, 2018 by meena.p

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What is the theoretical percent of aluminum in aluminum oxide?

asked Oct 16, 2018 by meena.p

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Silicon dioxide, made up of elements silicon and oxygen, contains 46.7% by mass of silicon. With what mass of oxygen will 10 g of silicon combine?

asked Oct 16, 2018 by meena.p

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A thin strip of iron with a mass of 15.5g is placed into a solution containing 21.0g of copper (II) sulfate and copper begins to form. After some times, the reactions stops because all the copper (II) sulfate has reacted. The iron strip is found to have a mass of 8.5g. The mass of copper formed is found to be 8.60g. What mass of iron (II) sulfate has been formed in the reaction?

asked Oct 16, 2018 by meena.p

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In a chemical reaction 150 g Baking soda mixture containing sodium bicarbonate and vinegar on heating gives 87 g of carbon dioxide gas. What mass of solid residue will left in food?

asked Oct 15, 2018 by meena.p

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Which of the following statements best defines the law of conservation of mass?

asked Oct 15, 2018 by meena.p

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Calculate the number of moles of ammonium sulphate present in 15.84 kg of it. (H=1, N=14, O=16, S=32)

asked Oct 15, 2018 by meena.p

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How many litres of ammonia are present in 3.4 kg of it? (N = 14, H = 1)

asked Oct 15, 2018 by meena.p

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How many litres of ammonia are present in 3.4 kg of it? (N = 14, H = 1)

asked Oct 11, 2018 by meena.p

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The reaction between aluminium carbide and water takes place according to the following equation:$Al_4C_3+12H_2O \longrightarrow 3CH_4+4Al(OH)_3$ calculate the volume of $C H_4$ released from $14.4\;g$ of $Al_4 C_3$ by excess water at S.T.P. $(C = 12, Al = 27)$

asked Oct 11, 2018 by meena.p

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What is the volume of 7.1 g of chlorine $(Cl=35.5)$ at S.T.P.

asked Oct 11, 2018 by meena.p

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The formula of ethanol is $C_2H_5—OH$. Its molecular mass is

asked Oct 11, 2018 by meena.p

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Convert 12 g of oxygen gas into mole

asked Oct 11, 2018 by meena.p

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If one mole of carbon atoms weigh 12 grams, what is the mass (in grams) of 1 atom of carbon?

asked Oct 11, 2018 by meena.p

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Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?

asked Oct 11, 2018 by meena.p

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If an atom or atoms gain electrons or lose protons, the ion will have a negative charge. This kind of ion is called an anion. Ions normally are found as

asked Oct 11, 2018 by meena.p

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Balanced equations have the same number of reactant atoms as the product atoms because the conservation of matter must apply in all regular chemical equations.

asked Oct 10, 2018 by meena.p

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In the usual laboratory preparation equation for the reaction in question 2, what is the coefficient of $O_2$?

asked Oct 10, 2018 by meena.p

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A compound that can be decomposed to produce oxygen gas in the lab is

asked Oct 10, 2018 by meena.p

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The most abundant element in the earth's crust is ?

asked Oct 10, 2018 by meena.p

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Balanced equations have the same number of reactant atoms as the product atoms because the conservation of matter must apply in all regular chemical equations.

asked Oct 10, 2018 by meena.p

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Fluorine is assigned an oxidation number of 1 in all compounds because fluorine is the most electronegative element.

asked Oct 10, 2018 by meena.p

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In the formula of a compound, the algebraic sum of the oxidation numbers must be 0 because oxygen's oxidation number in most compounds is ?

asked Oct 10, 2018 by meena.p

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Balance the following equation: $SnO_2+H_2+Sn+H_2O$

asked Oct 8, 2018 by meena.p

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Oxidation number of Cr in $K_2CrO_4$

asked Oct 8, 2018 by meena.p

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A chemical can be defined as

asked Oct 8, 2018 by meena.p

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