inamjazbi

What's the formula of water?

NO (g) + SO3 (g) euilibrium arrows NO2 (g) + SO2 (g) Kp=.0118
If at equilibrium a mixture contains 1.68 atm SO3, 2.33 atm NO2,and .0785 atm SO2, what is the pressure of NO?

PCl_5(s) + H₂O _(g) ? 2HCl _(g) +POCl_{3 (g)}[[K_eq= 11]]

At equilibrium, the 4.0Lflask contains the indicated amounts of the threechemicals.

PCl_{5 =} .012M H₂O = .016M HCl = .120 M

How many mL of an 2.38 %% (w/v) solution can be prepared from 18.60 gg g of sucrose?

answer in mL please

A test give positive results only with starch

◯ a. lodine test 

◯ b. Benedict's test 

◯ c. Seliwanoff's test 

◯ d. Barfoed's test

9. Concentrated weak acid is best described as which of the following?

A. a solution with a low pH
B. a solution where the concentration of undissociated acid particles is low compared to the
concentration of hydronium ions
C. a solution where the concentration of hydronium ions is large compared to the
concentration of undissociated acid particles
D. a solution with a high pH
E. a solution where the concentration of undissociated acid particles is high and the relative
quantity of hydronium ions is small

8. Which condition is not a condition for an equilibrium system?

A. equal rates for opposing changes
B. a closed system
C. reactants in the same phase
D. constant temperature
Knowledge/Understanding: 8 marks

9. What is the Brønstead-Lowry definition of a base?
A. a substance that donates protons
B. a substance that accepts protons
C. a substance that dissolves in water to form OH
ions
D. a substance that dissolves in water to form H+
ions

10. What is the conjugate acid of H2PO4- (aq)?

A. H3O+(aq)
B. OH-(aq)
C. H3PO4(aq)
D. HPO4 2-(aq)
E. PO4 3- (aq)

11. What is the conjugate base of HSO4- (aq)?

A. H3O+(aq)
B. OH-(aq)
C. H2SO4(aq)
D. SO4 2-(aq)
E. This compound does not have a conjugate base.

12. What is the concentration of hydroxide ions in a solution of 0.350 mol/L HI(aq)?
A. 0.350 mol/L
B. 0.175 mol/L
C. 2.86 x 10^ -14 mol/L
D. 0.650 mol/L
E. 1.30 mol/L

13. A solution contains 3.25 x 10^ -8 hydroxide ions. What is the pH of the solution?
A. 3.25
B. 6.51
C. 7.49
D. 8.00
E. none of the above

14. Identify the weakest acid.
A. HCN Ka = 6.2 x 10^-10
B. HCOOH Ka =1.8 x10^-4
C. HNO2 Ka = 7.2 x 10^-4
D. HF Ka = 6.6 x 10^-4
E. All acids are the same strength, as long as they have a dissociable hydrogen ion.

1. Which species are arranged in order of increasing entropy?

(1.5 points)

◯ (a) C3H8 (g) < CH3OH (l) 

◯ (b) CH3OH((l) < C3H8 (g)

◯ (c) Na+ (aq) < Hg(l)

◯ (d) Hg(l) < Na(s) 

The following carbohydrate shown is

◯ a. Disaccharides 

◯ b. Reducing 

◯ c. Non-reducing

◯ d. A and в 

◯ e. A and c

Balance the following redox reactions by the ion-electron method:

a.)     (acidic medium)

b.)    (acidic medium)

c.)    (acidic medium)

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Which statement is true for carbohydrates?

◯ a. All polysaccharides are reducing sugars 

◯ b. All monosaccharaides are reducing sugars 

◯ c. All polysaccharides are non-reducing sugars 

◯ d. All monosaccharaides are non-reducing sugars 

◯ e. Both B and C

◯ f. Both A and D

Including the cis or trans designation, what is the IUPAC name of the following substance? It is not necessary to put cis or trans in italics.

a) 2NO (g) + O2(g) 2NO2 (g)

b) COCl2{ (g) CO(g) + Cl2 (g)

c) CH3OH(I) CO(g) + 2H2 (g)

d) NaClO3(s) Na + (aq) + ClO-3(aq)

2- What is the oxidation number of Nitrogen in _______ and in is _______.

a.  +5 / -3

b. -0 / +5 7396 Ad 994 Tung here to search

A solution contains 9.00 gg g of CaCl2 (110.98 g/mol) in a total volume of 190.00 mL.

1.Exp ress the concentration of this solution in terms of g/L.

1.Determine the number of significant figures in the measurement 6.07 mm?

Express your answer numerically as an integer.

2.Determine the number of significant figures in the measurement 0.0030 ss?

Express your answer numerically as an integer.

3.Round the value 44.981 gg to three significant figures.

Express your answer numerically using three significant figures. in g

1. In the equation + 2l    2Br + The change of l to _____ while the change of to Br is ______

QUESTION 1

1. If a measured quantity is written correctly, which digits are certain?

   All the digits are certain

   All but the last two digits

   The first digit only

   All but the very last digit

QUESTION 2

1. The balance that is located in the Chemistry Lab measures the mass in:

   Milliliters

   Liters

   Grams

   Kilograms

QUESTION 3

1. 42 oC =

   300.15 K

   315.15 K

   273.15 K

   231.15 K

QUESTION 4

1. 53.5 mL equals:

   0.535 L

   0.0535 L

   5350 L

   0.00535 L

QUESTION 5

1. If a measured quantity is written correctly, which digits are uncertain?

   None of the digits are uncertain

   The last digit only

   The last two digits

   All the digits except for the first one

QUESTION 6

1. 21.5 oC =

   726.7 oF

   294.65 oF

   38.7 oF

   70.7 oF

QUESTION 7

1. Beakers do not give an accurate reading of volumes.

   True

   False

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Question 4 (5 points)

(a) Draw the Lewis structure for the nitrite ion,[1]

(b) Explain, considering hybrid orbital theory, the correct hybridization and shape of the central atom for the nitrite ion, . Upload your handwritten rationale and any appropriate work here. [2]

(c) Explain why sodium nitrite, is a solid and nitrogen dioxide, , is a gas at room temperature. [2] 

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QUESTION 18

How many grams of oxygen are contained in 19.5 grams of iron(III) perchlorate?

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1. For the gaseous equilibrium shown, 3A+B C+2D, some C is added to the system. The quantity of D will rise

A. True

B. False

2. A system at equilibrium means the concentration of reactants is equal to the concentration of products.

A. True

B. False

3. A concentrated weak acid cannot have a lower pH than a dilute strong acid.

A. True

B. False

4. A concentrated weak base can have a lower pOH than a dilute strong base

A. True

B. False

5. 1.0 mol/L solutions of weak bases will have a higher p#than 1.0 mol/l solutions of strong bases,

A. True

B. False

6. Conjugate acid base partners differ by a single proton,

A. True

B. False

Multiple Choice

Identify the choice that best completes the statement or answers the question.

7. A concentrated weak acid is best described as which of the following?

A. a solution with a low pH

B. a solution where the concentration of undissociated acid particles is low compared to the concentration of hydronium ions

C. a solution where the concentration of hydronium ions is large compared to the concentration of undissociated acid particles

D. a solution with a high pH

E. a solution where the concentration of undissociated acid particles is high and the relative quantity of hydronium ions is small

1. 0.02531 g = 25.31 kg

   True

   False

QUESTION 10

1. The equipment that measures the temperature is called:

   Thermometer

   Thermodynamic

   Thermochemistry

   Thermoelectric

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13. A solution contains 3.25 x hydroxide ions. What is the pH of the solution?

A. 3.25

B. 6,51

C. 7.49

D. 8,00

E. none of the above

14. Identify the weakest acid,

A. HCN                  = 62 x  

B. HCOOH              = 1.8 x  

C.              = 72 x

D. HF                    = 66 x

E. All acids are the same strength, as long as they have a dissociable hydrogen ion.

15. The equilibrium system shown below was analyzed and the concentrations of    and were found, in mol/L, to be 4.4, 3.2, 1.5 respectively. The equilibrium constant must be which of the following? 

A. 4.0

B. 0.25

C. 0.92

D. 1.1

E. 0.16

16. The equilibrium shown below was analyzed and the concentrations of  , and were found in mol/L, to be 4.5, 2.6 and 12. The equilibrium constant must be which of the following? 

A. 1.4

B. 0.69

C. 9.8

D. 0.84

E. 1.2, 

17. A full syringe contains this equilibrium 

If nitrogen dioxide gas is brown and the other gas is colourless, what is observed when the syringe is used to compress this gas mixture?

A. the mixture gets darker

B. the mixture gets lighter

C. no change in colour of the mixture

D. the mixture is colourless

18. Consider this equilibrium

If some nitrogen gas were injected into this system at constant temperature and pressure the system would most likely experience which of the following?

A. an increase in (hydrogen)

B. a decrease in (ammonial)

C. a decrease in (hydrogen)

D. an increase in (ammonia)

E. both c and d

19. Consider the following system at equilibrium

    Which of the following actions would cause the   to increase? 

A. I and II

B. III and VI 

C. IV and V

D. III

E. VI

If 20% of a compound is magnesium sulfate and the rest is aluminum hydroxide, the ratio of aluminum
hydroxide to magnesium sulfate is:
a. 3 : 1
b. 1 : 3
c. 0.25 : 1
d. 4 : 1

What is the pH of a 0.015 M aqueous solution of barium hydroxide?

A) 12.25
B) 12. 18
C) 1.82
D) 10.41 E) 1.5

When the coefficients in a balanced reaction are multiplied by a factor n, what happens to the sign and magnitude of ∆H for that multiplied reaction?

Is iron bar rust a chemical property?

The hydrogen sulfite ion 1HSO3
-2 is amphiprotic. Write a 
balanced chemical equation showing how it acts as an acid 
toward water and another equation showing how it acts as a 
base toward water. (b) What is the conjugate acid of HSO3?

What is its conjugate base?

Can I get so help on this

15. How many moles of can be produced when 4.00 mol Sc react with 9.00 mol ?

    ______  mol 

    ______ mol remain

16.  How many moles of can be produced when 2.00 mol C react with 6.00 mol ?

   ______ mol 

How many moles of each reactant are left over? note that at least one must disapp

How many moles and grams of carbon are present in 2.17 g of aspirin, ?

moles of C ______ mol

grams of C ______ 9

What is CN- in this base and conjugate acid pair

Rank acids from strongest to weakest

S (s) + O2 (g)----->SO2 (g) delta(triangle)H=-296 KJ/mol

a.) How much heat is evolved when 275 g of sulfur is burned inexcess oxygen?


b.) How much heat is evolved when 25 mol of sulfur is burned inexcess oxygen?



Please show work, I couldnt be more confused.

Hygroscopic means

How do ionic bonds affect the properties of ionic compounds?