take home quiz a, b and c (with keys) 2012-13

8/10/2019 Take Home Quiz a, B and C (With Keys) 2012-13

1/16

~ a k e ome Quiz 1 Chemical FoundationsFORM A HR Name

1 Water is added to 4 267 grams of UFg The only products are 3.370 grams of a solid containing only uranium

oxygen fluorine and 0.970 grams of a gas. The gas is 95.0 fluorine and the remainder is hydrogen.

a. From these data determine the empirical formula of the gas.

b. What fraction of the fluorine of the original compound is in the solid and what fraction in the gas after

the reaction?

c. What is the formula of the solid product?

d. Write a balanced equation for the reaction between UF6and HzO. Assume that the empirical formula of

the gas i s the true formula.


2/16

Take Home Quiz 1 Chemical FoundationsFORM

-/HR Name

1. Wa ter is added t o 4.267 grams of UF6. The only p roducts are 3.370 grams of a solid containing on ly uraniu moxygen flu orin e and 0.970 grams of a gas. The gas is 95.0 luorin e and the remain der is hydrogen.

a. From these data dete rmine the empirical formu la of the gas.-b. w h a t fraction o f the fluorine of the original compound is in the solid and what fraction in the gas after

.

the reaction? rc. Wha t is the formula of the solid product?d. Write a balanced equation for the reaction betwee n UF6 and H O. Assume that th e em pirical formula of

the gas is the t rue formula.


3/16

-----

.

~

_/r [ s


4/16

Take Home Quiz 1 Chemical Foundations

FORM HR Name

1 Combustion of 8.652 g of a compound containing carbon hydrogen oxygen and nitrogen yields 11.088 g of

carbon dioxide 3.780 g of water and 3.864 g of nitrogen dioxide.

a. How many moles of carbon hydrogen and nitrogen are contained in the sample?

b. How many grams of oxygen are containing the sample question?

c. What is the simplest formula of the compound?

d. If the molar mass of the compound lies between 200 and 300 what is i t s molecular formula?

e. Write and balance the chemical equation for the combustion of the compound.


5/16

ake Home Quiz 1 Chemical FoundationsFORM B HR Name

1. Combustion of 8.652 g of a compound containing carbon hydrogen oxygen and nitrogen yields 11.088 g ofcarbon dioxide 3.780 g of water and 3.864 g of nitrogen dioxide.

a. How many moles of carbon hydrogen and nitrogen are contained in the sample?b. How many grams of oxygen aie conteining the sample question?

c. What i s the simplest formula of the compound?d. If the molar mass of the compound lies between 200 and 300 what s i t s molecular formula?

. Write and balance the chemical equation for the combustion of the compound..


6/16


7/16

Take ome Quiz 1 hemical Foundations

FORM HR Name

An unknown compound contains only the three elements CJ I, and0 . When 2.34g sample of this compoundis combusted in 0 burned), 5.14g ofCO nd 2 8 1g of H O are produced. Assuming all of the carbon ofthe original sample is converted to CO, and all of the hydrogen in the original sample is converted to H,O,

solve the following problems.a.Determine the percent composition by mass of ca rbon, hydrogen, and oxygen of the original

sample.b.Determine the empirical formula of the com pound.c.It is determined by further experiments that the molar mass of the compound is180 282 glmol.

Determine the molecular formula.d.How many moles were present in the original sample?

e A C A


8/16

Take Home Quiz hemica l Founda tions

FORM HR Name

1 An unknown compound contains only the three elements C,H, and 0 .When 2.34g samp le of this compoundis combusted in 0 burn ed), 5.14g of CO z and 2.81g of H,O are produced. As sum ing all of the carbon ofthe original samp le is converted to CO, and all of the hydrogen in the original sa mp le is converted to H,O,solve the following problem s.

a.Determine the percent composition by mass of carbon, hydrogen, and oxygen of the originalsample.

b.Determine the em pirical formula of the com pound.c.It is determined by further experime nts that the molar mass of the com poun d is 1 80.28 2 glmol

Determine the molecular formu la.d.How many moles were present in the original sample?


9/16

4 II i k 3.

3.3L/1 id^^ I .jo ., C? u~~


10/16

Take Home Quiz Chemical Foundations

FORM HR Name

Water is added to 4 267 grams of UF The only products are 3 370 grams of a solid containing only uranium,

oxygen, fluorine and 0 970 grams of a gas. The gas i s m luorine and the remainder is hydrogen.

a. From these data, determine the empirical formula of the gas.

b. of the original compound is in the solid and what fraction in the gas after

the reaction? *.c. What is the formula of the solid product?

d. Write a balanced equation for the reaction between UF and H20. Assume that the empirical formula of

the gas is the true formula.


11/16


12/16

Take Home Quiz 1 Chemical FoundationsFORM A HR Name

1 Water is added to 4.267 grams of UF6 The only products are 3.370 grams of a solid containing only uranium

oxygen fluorine and 0.970 grams of a gas. The gas is 95.0 fluorine and the remainder is hydrogen.

a. From these data determine the empirical formula of the gas.

of the original compound is in the solid and what fraction in the gas after

the reaction?'4.

c. What i s the formula of the solid product?

d. Write a balanced equation for the reaction between UF and HzO. Assume that the empirical formula of

the gas i s the true formula.


13/16

Take Home Quiz 1 Chemical FoundationsFORM B HR Name

1. Combustion of 8.652 g of a compound containing carbon hydrogen oxygen and nitrogen yields 11.088 g ofcarbon dioxide 3.780 g of water and 3.864 g of nitrogen dioxide.

a. How many moles of carbon hydrogen and nitrogen are contained in the sample?b. How many grams of oxygen are containing the ramble question?

c. What is the simplest formula o f the compound?d. If the molar mass of the compound lies between 200 and 300 what i s i t s molecular formula?e. Write and balance the chemical equation for the combustion of the compound.

./

n = l t o S f CO .\ / I b I C O rca cYY I w o Co = 1


14/16


15/16

Take Home uiz hemical Foundations - -IFORM HR Name

\i c

1. An unknown compound contains only the three elementsC H and 0 . When 2.348 sample of this compoundis combusted in0 burned), 5.14g of CO, and 2.81g of H,O are produced. Assum ing all of the carbon ofthe original sample is converted toCO and all of the hydrogen in the orig inal sample is converted to H,O,solve the following problems.

a.Determine the percent composition by mass of carbon, hydrogen, and oxygen of the originalsample.

b.Determine the empirical formula of the compound.c.It is determined by further experiments that the molar mass of the compound is 180.282 glmol.

Determine the molecular formula.d.How many moles were present in the original sample?


16/16

take home quiz a, b and c (with keys) 2012-13

Documents