All categories

3 years ago

TRUE OR FALSE

Chemistry

2 answers:

liraira [26]3 years ago

7 0

Answer:

1. True

2. False

3.False

4.True

5. True

6. True

7.False

8.True

9. False

10. True

11. True

12. True

13. False

14. True

15. True

16. False

17.True

Explanation:

1. True. In chemical equations the OH ion is used to denote hygrogen in its aqueous state. Also, the H can be used for this as well

2. False. The Bronsted-Lowry model says that an acid is a hydrogen-ion donor.

3.False. The pH scale go from 1 to 14

4.True. An acidic solution is a solution that contains more of hydrogen ions than hydroxide ions

5. True. Sodium Hydroxide is a base because of its OH group present.

6. True. Both acids and bases are good conductors because they can easily dissociate to release their H and OH ion in a solution.

7.False. Lemon has a low pH. This makes it an ACID

8.True. This is the Arrhenius model

9. False. Acids taste sour while bases taste bitter

10. True. Water can only produce H and OH ions during self ionization.

11. True. Substances with pH values 1-6 are acids

12. True. percent Hydrogen and p Hydroxide ions add up to 14.

13. False. HCL is Hydrochloric Acid

14. True. The additive inverse of pH is the pOH. Acids have low pH and hence high pOH values.

15. True. Both acids and bases react with metals to liberate hydrogen gas.

16. False. Monoprotic ions only donate one hydrogen ion.

17.True. The pH is defined mathematically as the negative logarithm of the hydrogen ion concentration

Anon25 [30]3 years ago

5 0

Answer:

1. True

2. False

3. False

4. True

5. True

6. True

7. False

8. True

9. False

10. True

11. True

12. True

13. True

14. True

15. True

16. False

17. True

Explanation:

1. True

The H⁺ ion is essentially a proton and is transferred to other H₂O molecule to form the hydronium (H₃O⁺) ion, hence, they can be used interchangeably in aqueous solutions.

2. False

A Br∅nsted-Lowry acid is a hydrogen ion or proton donor

3. False

The pH scale go from 1 to 14

4. True

Due to the shift in the balance in the hydrogen ions concentration when an acid is dissolved in a solution, an acid contains more hydrogen ions than hydroxide ions in the solution

5. True

In an aqueous solution, NaOH dissociates to form Na⁺ and OH⁻ making it a base

6. True

Water soluble acids and bases dissociates into ions in aqueous solution and can conduct electricity

7. False

A base is a substance with a high pH

8. True

Arrhenius model of an acid states that an acid contains and ionizes to produce hydrogen ions

9. False

Due to the hydrogen ion, acids tastes sour

10. True

The reaction for the self ionization of water is as follows;

2H₂O (l) ⇄ H₃O⁺ (aq) + OH⁻ (aq)

11. True

Acids are substances with pH below 7

12. True

The sum of pH and pOH is 14

13. True

In an aqueous solution, HCl dissociates to produce hydronium (H₃O⁺) ion

14. True

pH = 14 - pOH, therefore, for a substance to have a pH below 7 (acidic), the pOH should be higher than 8

15. True

Sodium hydroxide reacts with water and zinc to produce hydrogen gas and sodium zincate

16. False

Monoprotic donate one hydrogen ion

17. True

The pH is found by taking the negative logarithm of the hydrogen ion concentration.

You might be interested in

Give the measurement following sig fig rules for tools. Do not forget the unit after your number measurement.

In-s [12.5K]

Answer:

Explanation:

You are not really helped by what is hold the liquid. Beakers and cylinders come on a lot of sizes. I hate to be crabby about things like that, but you really need to be aware that the question is slightly flawed (not your fault).

The beaker, you'd be like to get 1 sig digit. You have to be awfully careful about claiming more. So the and is 50 mL, but that mL is a guess and the 50 is not totally accurate, but what would you say the second digit is? 48 or 47? You don't really know. Maybe even 49.

The graduated cylinder is a little better. Read the bottom of the meniscus (the bottom of the 1/2 bubble). I think you can get 2 sig digs., so the answer is 36 mL. But everything also depends on what you have been told.

5 0

3 years ago

What is the gasoline doing to our environment?

luda_lava [24]

Gasoline use contributes to air pollution
Gasoline is a toxic and highly flammable liquid. The vapors given off when gasoline evaporates and the substances produced when gasoline is burned (carbon monoxide, nitrogen oxides, particulate matter, and unburned hydrocarbons) contribute to air pollution. Burning gasoline also produces carbon dioxide, a greenhouse gas.

5 0

3 years ago

Explain the process of rainwater harvesting with its advantages .

leva [86]

Answer:

the environmental benefits of rain water harvesting

Explanation:

rainwater harvesting can reduce stormwater runoff a property by reducing stormwater runoff rainwater harvesting can reduce is term peak flow volume and velocity in local cricket stream and rivers thereby reducing the potential for stream Bank erosion

4 0

3 years ago

Pls help

erik [133]

Hello!

The statement that best proves that the law of conservation is obeyed during this process is that The total mass of oxygen and carbon is equal to the total mass of carbon dioxide.

The chemical equation for the combustion reaction of coal in the carbon cycle is the following one:

C(s) + O₂(g) → CO₂(g)

From this simple chemical equation, we can conclude that if the Law of Conservation of Matter is obeyed in this reaction, the sum of the initial masses of Carbon and Oxygen before the reaction will be equal to the total amount of Carbon Dioxide formed by it, because they sum up to produce Carbon Dioxide.

Have a nice day!

4 0

3 years ago

Read 2 more answers

Where is the moon located in relation to Earth and the sun when it is a first-quarter moon?

dangina [55]

At first quarter and last quarter, the Moon lies perpendicular to a line between Earth and the Sun. We see exactly half of the Moon illuminated by the Sun — the other half lies in shadow. Hope it helps :)

7 0

3 years ago