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boyakko [2]
2 years ago
5

A student dissolves a mass of ammonium nitrate in water and notices that the temperature of the mixture decreases by

Chemistry
1 answer:
Mrac [35]2 years ago
6 0

The conclusion of the student would be that the dissolution of ammonium nitrate is endothermic.

<h3>What are endothermic reactions?</h3>

They are reactions in which heat is absorbed from the surrounding. The consequence is that the reaction mixture's temperature is always lower.

Thus, the energy of the products is always higher than the energy of the reactants in endothermic reactions.

For endothermic reactions, the enthalpy change is always positive.

More on endothermic reactions can be found here: brainly.com/question/23184814

#SPJ1

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Which change will cause more CO2 to form in a closed container?​
EastWind [94]

Answer:

Option C Removing Na₂CO₃

Option E Heating the container.

Explanation:

The equation for the reaction is given below:

2NaHCO₃ (s) <=> Na₂CO₃ (s) + CO₂ (g) + H₂O (g)

Enthalpy change (ΔH) = 136 KJ

To obtain more CO₂ do the following:

1. Add more NaHCO₃

From chemical equilibrium, adding more NaHCO₃ means the reactant has increase. Thus, it (the reactant) will react to form more product (CO₂)

2. Removing any of the products. Removing any of the products implies that more reactants are in the reaction vessel than the product. Thus, the reactants will react to produce more products (CO₂)

3. Heating the container. Heating the container will lead to an increase in the temperature of the reaction. Since the enthalpy change (ΔH) is positive it means the reaction is endothermic. Thus, heating the container i.e increasing the temperature will favours the forward reaction i.e more products will be obtained.

NOTE: Pressure has no effect in the reaction system since there is no gaseous reactants.

Considering the options given above, C and E gives the correct answer to the question.

8 0
3 years ago
Which observation most likely indicates that only a chemical change has taken place?
Sav [38]

The observation that  most likely indicates that only a chemical change has taken place is that the change cannot be reversed.

There are two types of change which matter undergoes;

  • Physical change
  • Chemical change

A chemical change leads to the formation of a new substance so it is usually irreversible.

On the other hand, a physical change is easily reversible. It often involves a change in shape, form or appearance of matter.

If a change is  cannot be reversed, it is most likely a chemical change.

Learn more: brainly.com/question/6284546

7 0
3 years ago
Read 2 more answers
Beta-galactosidase follows Michaelis-Menten kinetics. A 5 micromolar solution of beta-galactosidase catalyzes the formation of 0
jek_recluse [69]

Answer : The beta-galactosidase's K_{cat} is, 160s^{-1}

Explanation :

Michaelis-Menten formula used :

V_o=\frac{V_{max}}{K_{cat}}

where,

V_o = initial concentration = 5\mu mol=5\times 10^{-6}mol

V_{max} = maximum concentration = 0.8mmol.s^{-1}=0.8\times 10^{-3}mol.s^{-1}

K_{cat} = Michaelis-Menten constant = ?

Now put all the given values in the above formula, we get:

5\times 10^{-6}mol=\frac{0.8\times 10^{-3}mol.s^{-1}}{K_{cat}}

K_{cat}=160s^{-1}

Therefore, the beta-galactosidase's K_{cat} is, 160s^{-1}

6 0
3 years ago
Identify whether longhand notation or noble-gas notation was used in each case below. Potassium (K): 1s22s22p63s23p64s1
Vaselesa [24]

<u>Answer:</u> The given electronic configuration is long hand notation.

<u>Explanation:</u>

Long-hand notation of representing electronic configuration is defined as the arrangement of total number of electrons that are present in an element.

Noble-gas notation of representing electronic configuration is defined as the arrangement of valence electrons in the element. The core electrons are represented as the previous noble gas of the element that is considered.

The given electronic configuration of potassium (K): 1s^22s^22p^63s^23p^64s^1

The above configuration has all the electrons that are contained in the nucleus of an element. Thus, this configuration is a long-hand notation.

3 0
3 years ago
Read 2 more answers
Consider this reaction: NH4+ + HPO42− → NH3 + H2PO4−
a_sh-v [17]
Bronsted Lowry Acids are donates protons
Therefor it is <span>NH4+</span>
6 0
3 years ago
Read 2 more answers
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