I don't know which one it is!

Choose the aqueous solution below with the lowest freezing point. These are all solutions of nonvolatile solutes and you should

Ymorist [56]

Answer:

B. 0.075 m (NH4)3PO4

Explanation:

Our strategy here is to recall the van´t Hoff factor, i, for the colligative properties of electrolyte solutions which appears as the consequence that electrolytes disociate completely in their solutions in water.

Thus in this problem we need to determine i and then realize the one with the lowest freezing point will have the biggest i ( all the concentrations are equal) since

ΔTf = i m Kf

Substance van´t Hoff factor

Li I 2

(NH4)3PO4 4

NaIO4 2

KCN 2

KNO2 2

The correct answer is B. 0.075 m (NH4)3PO4

4 0

3 years ago

How does a conjugate acid differ from its conjugate base?

inna [77]

The conjugate acid is differ from its conjugate base as, conjugate acid is formed by strong base whereas conjugate base is formed by strong acid.

conjugate base is differ from conjugate acids by the presence of the proton. The conjugate acid is formed when proton is added to the bases whereas conjugate bases is formed when proton is released by the acids.

Example of corrugate acids are given below.

$NH_{3}$ → $NH_{2} ^{-} +H^{+}$

In the above example $NH_{2} ^{-}$ is conjugate acids.

Learn about conjugate acid

brainly.com/question/12883745

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3 0

1 year ago

Order the theories from oldest to most recent.

rjkz [21]

Answer:

Explanation:

The following are the order of point from oldest to most recent

1. Atoms are tiny indivisible particles that make up all mater.

it is Postulate of Dalton's atomic theory. this theory was put forward in 1803

2. Negatively charged electrons are embedded in a mass of positive charge.

In 1897 J.J Thomson discovered that atom consist of tiny negatively charged particles called electrons that are uniformly spread in +vely charged matrix this model called as plum pudding model.

3. Atoms consist of mostly empty space with a dense nucleus of positive charge.

While doing experiment on gold foil Rutherford presented a model in 1909 and stated that atom consist mostly empty space with dense nucleus.

4. Electrons occupy specific energy levels surrounding a positively charged nucleus.

Niels Bohr in 1913 put forward a model to explain atomic orbitals/energy level. This is a postulate of Bohr model.

5. Electrons move about a positively charged nucleus in clouds that are defined by probabilities.

In 1926 Erwin Schrödinger explain the wave function of electrons and its probability.

5 0

3 years ago

If the radius of copper is 0.128 nm, what is the pd of the (100) plane for copper in m-2?

kolbaska11 [484]

Copper has a FCC i.e. face centered cubic crystal structure. The 100 plane is essentially a planar section of the cubic cell where 4 Cu atoms occupy the 4 corners of the plane along with 1 Cu atom at the center of that plane. Each of the Cu atoms in the corners is shared by 4 adjacent unit cells. Thus, there are 2 Cu atoms present in the 100 plane (4*1/4 + 1 = 2).

Now, the planar density PD along the 100 plane is given as:

PD(100) = # atoms in the 100 plane/Area of 100 plane

= $\frac{2}{8R^{2} }$