I need help with these questions.

Answer:

For atoms of elements in the same group (except the last 2 columns of group VIIIB), what is the relationship between the group number and the valence electron?

Answer:

I'm assuming atmospheric pressure, since it says she is measuring pressure exerted my atmospheric gases

Answer: sodium (Na +) cation and fluoride (F -) anion

Explanation:

Formula and structure: The chemical formula of sodium fluoride is NaF and its molar mass is 41.99 g/mol. It is a simple ionic compound, made of the sodium (Na +) cation and fluoride (F -) anion. The solid salt exists as cubic crystals similar to the crystal structure of sodium chloride (NaCl).

[tex]\\ \sf\longmapsto c=\lambda v[/tex]

[tex]\\ \sf\longmapsto v=\dfrac{c}{\lambda}[/tex]

Now

[tex]\\ \sf\longmapsto E=hv[/tex]

Put value of v found before

[tex]\\ \sf\longmapsto E=\dfrac{hc}{\lambda}[/tex]

Answer:

Both Magnesium and aluminium rods are metals, hence they allow flow of charged electrons due to high drift velocity.

Explanation:

• An electric conductor is material which allows flow of electric current.

[tex].[/tex]

The Magnesium (Z = 12) is an alkaline earth metal and the Aluminium (Z = 13) is a metal in the Boron Group. One characteristic of the metals is that they have facility to lose electrons, wich means facility to conduct electricity.

Moreover, the metals are ductile, so it is easy to turn them into wires. For example, the light poles has wires made by copper because the copper is another metal, so its have the same properties as indicated above.

I hope I've helped. =D

Enjoy your studies! \o/

Answer:  K only has 1 valence electron.  It will leave with only a little effort, leaving behind a positively charged K^+1 atom.

Explanation:  A neutral potassium atom has 19 total electrons.  But only 1 of them is in potassium's valence shell.  Valence shell means the outermost s and p orbitals.  Potasium's electron configuration is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1.  The 4s orbital is the only orbital in the 4th energy level.  So it has a valency of 1.  This means this electron will be the most likely to leave, since it is the lone electron in the oyutermost energy level (4).  When that electron leaves, the charge on the atom go up by 1.  The atom now has a full valence shell of 3s^2 3p^6, the same as argon, Ar.

Well, each ml of water requires one calorie to go up 1 degree Celsius, so this liter of water takes 1000 calories to go up 1 degree Celsius. (There are 1000 ml, each of which needs to have its temperature raised.)

Answer:

Observe the other planet throughout the year. Look at the environment when the season changes to see what changes in the environment.

Answer:

Every planet in the solar system has seasons. Extraterrestrial seasons are hardly noticeable on some planets (Venus), mindbogglingly extreme on others (Uranus) and in some cases simply impossible to define (Mercury).

Answer:

ano gagawin dyan? HAAHAHA

Answer:

I don't know what is the actual answer

Answer:

It remains the same

Explanation:

The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. For example, the mass of sodium plus the mass of chlorine that reacts with the sodium equals the mass of the product sodium chloride.

Answer:

a proton turns into an atom that goes kabloey into fission products and other neutrons.

Explanation:

Answer:

Below

Explanation:

Metallic compounds are excellent conductors of heat due to the fact that their electrons, instead of orbiting their respective atoms, form a sea of electrons around the positively charged nuclei of the interacting metal ions. These electrons are able to move freely around and bond, allowing them to conduct heat well.

Hope this helps! :)

Answer:

Explanation:

Hydrochloric acid reacts with sodium hydroxide according to the equation:

NaOH + HCl ------> NaCl + H2O

25 cm of NaOH was neutralized by 26. 25 cm^3 of a 0.1 M solution of HCl.

Calculate how many moles of HCI was neutralized

if 1 liter of the HCl has 0.1 moles, 100 ml has 0.01 moles  

so 26.25 ml has 0.01 X26.25/100 moles or 0.002625 moles

b

Calculate how many moles of NaOH was neutralized.  the reaction is 1:1

so 0.002625 moles of NaOH were reacted.

Calculate the concentration of the NaOH used​

25 ml of NaOH were used so the concentration was

(0.002625/25) x 10^3=0.000101X1000 =0.105 MOLES/LITER

Answer:

summer solstice

Explanation:

on june solstice the northen hemisphere leans more toward the sun giving us longer days and more strong sunlight and It's the opposite in the Southern Hemisphere where june marks the start of winter thus its the shortest day of the year

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

There are two types of chemical reactions namely exothermic and endothermic reaction.

Given the heat of solution of KI as 20.3 kJ/mol.

Since it is positive, the reaction is exothermic and  ΔH is positive

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

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Solute

The salt being dissolved is the solute.

According to the concept of solubility, thing which dissolves is solute and in which it is dissolved is solvent , hence juice crystals are solute and water is solvent.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

Learn more about solubility,here:

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#SPJ2

Answer:

So if you are buying, Inorganic is cheaper but at the cost of it's quality, organic fertilizer is better quality that's why it is more expensive, both work so if you want the cheaper option that's fine it still works

Explanation:

Explanation:

It's none of these.

Cr- 1s2 2s2 2p6 3s2 3p6 4s1 3d5

Mg- 1s2 2s2 2p6 3s2

Mn - 1s2 2s2 2p6 3s2 3p6 4s2 3d5

Fe- 1s2 2s2 2p6 3s2 3p6 4s2 3d6

I think there's a mistake in the question.

A food supply company produces Yellow-42 (from previous example) in 200-gram wholesale bottles. The grams of FeCl3 needed to produce one bottle of Yellow 42 is 303.638 grams.  The amount of NaOH needed to produce one bottle of Yellow 42 is 226.32 grams.

∴

Using the relation for the number of moles which is:

[tex]\mathbf{number \ of \ moles = \dfrac{mass }{molar \ mass}}[/tex]

[tex]\mathbf{number \ of \ moles \ of \ Yellow \ 42 = \dfrac{200 g }{106.867 \ g/mol}}[/tex]

[tex]\mathbf{number \ of \ moles \ of \ Yellow \ 42 =1.872 \ moles}[/tex]

Now,

∴

Mass of FeCl₃ required = number of moles of  FeCl₃ × molar mass of FeCl₃

Mass of FeCl₃ required = 1.872 moles × 162.2 g/mol

Mass of FeCl₃ required = 303.638 grams

7.

Recall that:

Now, 1.872 moles of Fe(OH)₃ will require (3 × 1.872 moles of NaOH)

= 5.616 moles of NaOH

Thus, the amount of NaOH in grams, that will be needed to produce one bottle of Yellow 42 is:

= 5.616 moles × 40.3 g/mol (molar mass of NaOH)

= 226.32 grams of NaOH

8.

The company could set up this reaction in a way that ensures no iron (III) chloride is wasted in the reaction by using the concept of the stoichiometry of the reaction involved in the system and he should feed the reactant within the ratio of 1:3 for FeCl₃ and NaOH respectively.

Learn more about stoichiometry here:

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Answer:

creo q es electrico

Explanation:

Statements that describes nuclear fission and nuclear fusion as regards this question are:

C: They both release large amounts of energy

D:They both involve one atom splitting into two atoms.

Therefore, option C, D are right.

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Answer:

C: They both release large amounts of energy

D: They both involve one atom splitting into two atoms

Answer:

I don't do chemistry

Explanation:

sorry

Answer:

Solubility, Volatility, Viscosity and Surface Tension.