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Recent questions and answers in chemical formulae

Questions >> SAT >> Chemistry >> chemical formulae

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

answered Oct 25, 2018 by meena.p

1 answer

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

answered Oct 25, 2018 by meena.p

1 answer

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

answered Oct 25, 2018 by meena.p

1 answer

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 ,

answered Oct 25, 2018 by meena.p

1 answer

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?

answered Oct 25, 2018 by meena.p

1 answer

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

answered Oct 25, 2018 by meena.p

1 answer

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

answered Oct 25, 2018 by meena.p

1 answer

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

answered Oct 25, 2018 by meena.p

1 answer

Electrolysis of water is

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

Extent of a reaction denotes

answered Oct 16, 2018 by meena.p

1 answer

Which one is not a dimension?

answered Oct 16, 2018 by meena.p

1 answer

How many significant figures are there in 0.002000?

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

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?

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

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?

answered Oct 16, 2018 by meena.p

1 answer

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?

answered Oct 16, 2018 by meena.p

1 answer

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

answered Oct 16, 2018 by meena.p

1 answer

What is the theoretical percent of aluminum in aluminum oxide?

answered Oct 16, 2018 by meena.p

1 answer

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?

answered Oct 16, 2018 by meena.p

1 answer

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?

answered Oct 16, 2018 by meena.p

1 answer

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?

answered Oct 15, 2018 by meena.p

1 answer

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

answered Oct 15, 2018 by meena.p

1 answer

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

answered Oct 15, 2018 by meena.p

1 answer

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

answered Oct 15, 2018 by meena.p

1 answer

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

asked Oct 11, 2018 by meena.p

0 answers

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. $(C = 12, Al = 27)$

answered Oct 11, 2018 by meena.p

1 answer

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

answered Oct 11, 2018 by meena.p

1 answer

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

answered Oct 11, 2018 by meena.p

1 answer

Convert 12 g of oxygen gas into mole

answered Oct 11, 2018 by meena.p

1 answer

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

answered Oct 11, 2018 by meena.p

1 answer

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?

answered Oct 11, 2018 by meena.p

1 answer

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

answered Oct 11, 2018 by meena.p

1 answer

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.

answered Oct 10, 2018 by meena.p

1 answer

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

answered Oct 10, 2018 by meena.p

1 answer

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

answered Oct 10, 2018 by meena.p

1 answer

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.

answered Oct 10, 2018 by meena.p

1 answer

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

answered Oct 10, 2018 by meena.p

1 answer

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 ?

answered Oct 10, 2018 by meena.p

1 answer

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

answered Oct 8, 2018 by meena.p

1 answer

Oxidation number of Cr in $K_2CrO_4$

answered Oct 8, 2018 by meena.p

1 answer

A chemical can be defined as

answered Oct 8, 2018 by meena.p

1 answer

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