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Savatey [412]
3 years ago
13

A chemistry student mixes 5 grams of sodium chloride (NaCl) in 100 ml of water and stirs until all of the salt is dissolved. Onc

e dissolved, the student measures the electrical conductivity of the solution. An additional 5 grams of NaCl is then dissolved in the solution. Which statement MOST accurately describes how the additional five grams of salt will affect the electrical conductivity of the solution?
Chemistry
2 answers:
ohaa [14]3 years ago
8 0

Answer:

the answer is A

an also for usa test prep

Explanation:

IrinaVladis [17]3 years ago
6 0
I think the answer is A, but I have the same question, so if you know the correct answer, could you let me know? Thanks!

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What ions and/or molecules (apart from water) are present in relatively large proportions in a solution of a weak acid hclo (aq)
matrenka [14]

HClO, perchloric acid is a weak acid. Unlike strong acids like HCl or H2SO4 it not dissociate completely but partially such that an equilibrium exists between the dissociated ions and the undissociated acid. The equilibrium is as shown below:

HClO + H2O ↔ H3O⁺ + ClO⁻

Since HClO is a weak acid, the reverse reaction is favored over the forward reaction. Thus apart from water, HClO will be present in large amounts.

3 0
3 years ago
Which choice best explains why a low-pressure system and a high-pressure system create different weather conditions?
RUDIKE [14]

Answer:

D. In a low-pressure system, air sinks, creating fair weather. In a high-pressure system, air rises, creating storms.

Explanation:

Hope this helps :)

4 0
3 years ago
Calculate the standard molar enthalpy of formation for Na2O(s), given that the standard enthalpy of formation for Na2O2(s) is -5
Anarel [89]

Answer:

- 416 kJ/mol

Explanation:

The standard enthalpy of the reaction (Δ H ∘ rxn) is independent of the pathway, so it can be calculated by the enthalpy of formation of the reactants and the products:

Δ H ∘ rxn = ∑n*Δ H ∘f products - ∑n*Δ H ∘f reactants

Where n is the number of moles in the balanced reaction. So, for the reaction given:

Na₂O(s) + 1/2O₂(g) → Na₂O₂(s)

Because O₂ is formed by only one elements, its Δ H ∘f is 0 kJ/mol:

-89.0 = (1*(-505) - (1*Δ H ∘fNa₂O)

Δ H ∘fNa₂O = -505 + 89

Δ H ∘fNa₂O = - 416 kJ/mol

3 0
4 years ago
I exercise
KatRina [158]

Explanation:

sorry po king Hindi kopo ma sagot

7 0
3 years ago
What best describes the role of the squirrel in the food web ​
Luden [163]

Answer:

squirrels play a essential role in the food chain as prey and predator they provide nutrition different organisms in habitats and promoting their predator

Explanation:

that's what the role is

3 0
4 years ago
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