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Question: Reaction of synthesis of ammonia at equilibrium: N2+3H2↔2NH3ΔH=−92.3kJ/mol. What factors disturb equilibrium of this reaction and cause a net reverse reaction (shift the reaction to the left)?

3. Adding more products (correct)

1. Removing reactants (correct)

6. Rising pressure

5. Lowering temperature

2. Adding more reactants

4. Raising temperature (correct)

Question: The molar mass of NaOH is 40 g/mol. How many grams of NaOH should be added to water for the preparation of 0.5 L of a 500 mM solution?

50g

8g

5g

10g (correct)

0.5g

Question: Which of the following statements about solutions is correct? Select one or more:

1. Real solution is always a homogeneous mixture. (correct)

2. A solution is formed when a solute dissolves in a solvent. (correct)

3. Regardless of the solute, the solvent must always be a liquid.

4. Substances with a similar molecular weight to the solvent will dissolve most readily.

5. The rule "like dissolves like" means that if the solvent and solute are both in the same phase (i.e., both liquids), they will dissolve most readily.

Question: Hydrogen bonds form when a (hydrogen) atom in one (POLAR) molecule is attracted to the (electronegative) atom of another molecule

hydrogen OXYGEN electronegative Signup and view all the answers

Question: Which of the following reactions is considered as a unimolecular reaction?

<ol start="3"> <li>NH4NO3(solid)heatingNO2(gas)+H2O(gas) (A)</li> </ol> Signup and view all the answers

Question: MATCH Classify each of these reactions:

<ol> <li>ZnSO4(aq)+Mg(s)→Zn(s)+MgSO4(aq) This is a bimolecular, heterogeneous reaction because it involves two reactants (ZnSO4 and Mg) in different phases (solid and aqueous)</li> </ol> (A), 2. N2O4(g)→2NO2(g) This is a unimolecular, homogeneous reaction because the decomposition involves a single molecule (N2O4) in a single phase (gaseous). (B), 3. NaNO2(aq)+HCl(aq)→NaCl(aq)+HNO3(aq) This is a bimolecular, homogeneous reaction because it involves two reactants (NaNO2 and HCI) in the same phase (aqueous) (C) Signup and view all the answers

Question: Which of the following statements about the rate of a chemical reaction is/are correct?

<ol> <li>The presence of a catalyst will increase the number of molecules entering the transition state. (A), 3. An increase in the concentration of reactants will increase the rate of chemical reaction. (C)</li> </ol> Signup and view all the answers

Question: Addition of 0.03 moles of HCl to 600 mL of phosphate buffer lowers the pH from 7.4 to 7.0. What is the buffering capacity for the acid?

0.125 mol/L (C) Signup and view all the answers

Question: 15 g of sugar was added to 120 g of a 20% sugar solution. What is the percent concentration of the resulting solution?

28.9% (D) Signup and view all the answers

Question: The addition of a catalyst to a reaction:

<ol start="3"> <li>Changes the activation energy (C)</li> </ol> Signup and view all the answers

Question: What is the charge of the granule in the micelle? The structure of the micelle in the colloidal solution is presented below.

<ol start="4"> <li>Positive because of nAg+ (D)</li> </ol> Signup and view all the answers

question with decres and incres

slitlgh Decrese incres decrese (A) Signup and view all the answers

Question: The enzyme carbonic anhydrase catalyzes the rapid conversion of CO2+H2O↔ H2CO3. What effect does doubling the amount of carbonic anhydrase have on equilibrium?

<ol start="2"> <li>Accelerates forward reaction in the direction of H2CO3 formation. (B), 3. Increases the rate of both forward and reverse reactions to the same extent. (C), 4. No effect on equilibrium (D)</li> </ol> Signup and view all the answers

Question: What would you add to the aqueous solution of hydrofluoric acid (HF\text{HF}HF) to form a buffer?

<ol> <li>NaOH (A), 3. KF (C), 5. NaF (@)</li> </ol> Signup and view all the answers

Question: Which of the following reactions can be considered as heterogeneous chemical reactions according to physical state?

<ol start="2"> <li>AgNO3(liquid)+HCl(liquid)→AgCl(solid)+HNO3(liquid) (B), 3. NH4NO3(solid)→heatingNO2(gas)+H2O(gas) (C)</li> </ol> Signup and view all the answers

Question: Which of the following statements are correct about oncotic pressure?

<ol start="3"> <li>It is osmotic pressure exerted by albumin and other proteins. (C), 4. Low oncotic pressure in plasma results in the expansion of interstitial fluid volume in tissues and edema. (D)</li> </ol> Signup and view all the answers

Question: Which of the following statements about jellification of high molecular mass compounds are correct?

<ol start="2"> <li>An increase in temperature results in a decrease in jellification. (B), 1. Jellification is the process by which a solution of macromolecules loses its fluidity. (A)</li> </ol> Signup and view all the answers

Question: A buffer was made by combining 0.1 M of potassium benzoate and 0.1 M benzoic acid. After the addition of 0.05 M of HCl acid, the pH of the buffer will change to _____. (pKapK_apKa of benzoic acid is 4.19).

3.71 (@) Signup and view all the answers

Question: Respiratory regulation of pH depends upon the:

<ol start="5"> <li>Carbonic acid/bicarbonate buffer system. (@)</li> </ol> Signup and view all the answers

Question: Reaction of synthesis of ammonia at equilibrium: N2+3H2↔2NH3,ΔH=−92.3kJ/mol(exothermic reaction). What factors disturb equilibrium of this reaction and cause a net forward reaction (shift the reaction to the right)?

<ol> <li>Rising pressure (A), 3. Adding more reactants (C), 5. Lowering temperature (@)</li> </ol> Signup and view all the answers

Question: Which of the following properties are characteristic of colloid dispersion systems?

<ol start="2"> <li>Low dispersal degree (B), 4. Tyndall effect (D), 1. Low stability without stabilizing materials (A)</li> </ol> Signup and view all the answers

If 15 mL of 3.0 M HCl are diluted to a total volume of 100 mL, what is the new concentration?

0.45 M (B) Signup and view all the answers

Question: Addition of 0.05 moles of HCl to 0.5 L of ammonium buffer lowers the pH from 9.2 to 9.1. What is the buffering capacity of the acid?

0.18 mol/L (D) Signup and view all the answers

Question: A student adds 6.00 g of a solid to the cone flask and adds water up to the 30.0 mL mark. The molar mass of the solid is 72.0 g/mol. What is the molarity (molar concentration) of the solution?

2.78 mol/L (D) Signup and view all the answers

Which of the following factors will result in increasing velocity (rate) of a chemical reaction?

Increasing in temperature (C) Signup and view all the answers

Normal blood plasma osmolarity is 0.3 Osm. What electrolyte should be used for infusions so that it is isotonic to the blood?

0.3 M NaCl (D) Signup and view all the answers

What will happen to a cell that is 70% water if it is in a solution of 30% water and 70% salt?

The cell would lose water and shrink. (D) Signup and view all the answers

Question: The micelle of the colloidal solution is: [m(Mg(OH)2)nOH−(n−x)K+]x+xK+

Al³⁺ in AlCl₃ (D) Signup and view all the answers

What mass of solute is present in 250 mL of a 0.100 mol/L solution of NaOH? Assume that NaOH has a molar mass of 40 g/mol.

1.00g (A) Signup and view all the answers

Sucrose dissolves well in water because:

Is a polar molecule (D) Signup and view all the answers

A 10° C increase in temperature triples the rate of chemical reaction. How many times increases the rate of chemical reaction when temperature rises from 10° C to 40° C?

Correct Matches:

• Real solutions: Homogeneous (B), • Suspensions: Paper filter (D), • Colloidal solutions: Paper filter (A), • Concentrated solutions of high molecular mass compounds: Can form jelly (C) Signup and view all the answers

QUESTION Which of the following reactions can be considered as heterogeneous chemical reactions according to physical state?

NH₄NO₃ (solid) → heating → NO₂ (gas) + H₂O (gas) (B), AgNO₃ (liquid) + HCl (liquid) → AgCl (solid) + HNO₃ (liquid) (C) Signup and view all the answers

Which of the following statements is correct regarding the solubility of gas in water? The options provided are:

Increases as the temperature of the water decreases. (A) Signup and view all the answers

Question: Which state of acid-base imbalance develops due to elevated CO₂ in the blood because of decreased respiration rate?

Respiratory acidosis (D) Signup and view all the answers

Capital of France (example flashcard)

Paris

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