How many atoms are in 0.250 moles of Rb?

Write a CER to explain what happened to this styrofoam head. The pics are of the head above water, at a depth of 1000m underwate

statuscvo [17]

Answer:

what is that i connot understand your question

Explanation:

im sorry i connot answer your question

4 0

3 years ago

explain how a metal with one valence electron compares with a metal with more than one valence electron

slamgirl [31]

Explanation:

A metal with one valence electron is highly reactive compared to those with more than one electron.

Atoms including those of metals reacts in order attain a stable electronic configuration just like those of noble gases.

An atom with one valence electron have just one electron in its valence shell.

Metals generally have large sizes.
when the electron in this shell is lost, the metal atom can then attain stability.
therefore, such atom will quickly want to combine with any other willing to accept the electron so that they can be stable.
Those with more than one electron will find it difficult to lose them.
It requires huge energy to remove such electrons compared to the ones with only one valence electron.

learn more:

Valence electrons brainly.com/question/3023499

#learnwithBrainly

7 0

2 years ago

Lead(II) chromate, PbCrO4, is a yellow paint pigment (called chrome yellow) prepared by a precipitation reaction. In a preparati

Roman55 [17]

Answer:

n = 0.1624 moles

Explanation:

$n=\frac{m}{M} \\n=\frac{52.5}{323.1937} \\n= 0.1624 mol$

8 0

2 years ago

What are the characteristics of non-ideal solutions? a. The solute-solute and solvent- solvent interaction is different fromm th

finlep [7]

Answer:All the above

Explanation:

Non-ideal solutions are those solutions which do not obey Raoult's law in any conditions.

The molecular interactions of two components that is solute and solvent are different.

If there are two components A and B then the molecular interaction between A-A,B-B would be different from the molecular interactions in A-B .

The enthalpy of mixing and volume of mixing for non-ideal solutions have non zero values.

Enthalpy of mixing can be negative or positive in case of non-ideal solutions. If the enthalpy of mixing is negative so energy has been released upon mixing the two components and if enthalpy of mixing is positive then energy is absorbed upon mixing the two components.

Non-ideal solutions are simply those solutions which are not ideal hence they should not be having the characterstics of ideal solutions.

For ideal solutions the molecular interactions between the two components are equal.

So the molecular interaction between A-A,B-B would be equal to the molecular interaction between A-B. Also the enthalpy of mixing and volume of mixing for ideal solutions are zero hence all the statements provided here are correctly charactersing non-ideal solutions.

4 0

3 years ago

Which grouping identifies chemical properties?A. Density, luster, boiling point B. Melting point, hardness, conductivity C. Mall

stich3 [128]

Answer:

option D. Combustibility, flammability, reactivity.

Explanation:

Physical properties: characteristics of the matter that can be observed and measured by physical media, withoud changing the composition of the matter.

Typical examples of physical properties are: mass, volume, density, boiling point, melting point, hardness, specific heat.

Chemical properties: they are ability of the matter to change by decompositon or combination with other substances to produce one or more different substances. They cannot not be observed or measured without changing the composition of the orignal sample.

Typical examples of chemical properties are reactivity with oxygen, reactivity with water, and any reactitivy in general.

Hence, applying those definitions to the set of choices you get:

A. Density, luster, boiling point (incorrect)

All of them are physical properties since they are observable and measurable without altering the composition of the sample.

B. Melting point, hardness, conductivity  (incorrect)

They all are also physical properties. For example, melting point can be measured with a thermometer during the phase change.

C. Malleability, ductility, texture (incorrect)

Again, all physical properties. Ducitlity, for example, is the ability of the metals to form this wires.

D. Combustibility, flammability, reactivity (correct answer)

Combustibility: is the reaction with oxigen to form CO₂ and H₂O

Flammability: is the ability to burn in flames, which is a chemical change.

Reactivity: Already discussed.

All these properties can only be measured by producing the correspondant chemical reaction (change), so they are chemical properties.

8 0

3 years ago