which of these elements has the greatest attraction for electrons in a covalent bond?

A. Se
B. As
C. Br
D. Kr
​

The reason for adding a limited amount and then an excess amount is that initially a metal hydroxide may form which becomes soluble when more base is added and the metal complex forms.

In qualitative analysis is a common to add the base in drops and then in excess. When added in drops, the metal hydroxide is formed. This metal hydroxide is often insoluble.

After this metal hydroxide is formed, the base could be added in excess such that the metal hydroxide dissolves in the excess base by forming a complex.

For instance;

CuCl2(aq) + 2NaOH(aq)  -------> Cu(OH)2(s) + 2NaCl(aq)

Cu(OH)2(s) + 2OH^-(aq) -------> [Cu(OH)4]^2+(aq)

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Answer:

Even though i cannot see the image, In chemistry, a mixture is a material made up of two or more different chemical substance/substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

Explanation:

Answer: A and C

Explanation:

Low tides occur in locations at 90 degree angles to the moon. Tidal cycles have the same length as the lunar day, 24 hours and 50 minutes. In this time span, most locations will experience two high tides, when the location is close to and far from the moon, and two low tides. Sides A and C are angled 90 degrees from the moon.

Hence, low tides are located at A and C.

Answer:90 degree angles to the moon.

Explanation:

Answer:

i want to help but  i   d   k. the answer :( sorry i couldnt help

Explanation:

Answer:

8

Explanation:

All fabrics will burn, but some are more combustible than others.

hope it helps

Answer:

25 + 273= 298k.

Explanation:

I guess it's correct answer

The equivalent Kelvin temperature is 298 K.

Temperature is defined as a measurement of an object's or substance's warmth or coolness in relation to a standard value.

It can also defined as the feature of matter that represents the amount of energy of motion of its constituent components.

Temperature scale is defined as a method of indicating or measuring temperature with respect to a beginning point (0 or zero) and a unit of measurement.

Temperature scale is also defined as a way of calibrating the physical quantity temperature in metrology.

Usually there is three types of temperature scale is used.

Thus, the equivalent Kelvin temperature is 298 K.

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Answer:

c

Explanation:

oxygen is lost electrons are added in oxidation state is decreased

Answer:

the correct answer is C

hope this helps <3

Answer:

minerals

Explanation:

Hope this helps

Explanation:

Answer:

A. 8

Explanation:

For this to be a neutral atom there has to be the same amount of protons and neutrons.

brainliest please. . .

The required net ionic equation is; 2H^+(aq) + 2OH^-(aq)-----> 2H2O(l)

The molecular reaction equation is;

H2SeO3(aq) + 2KOH(aq) -----> K2SeO3(aq) + 2H2O(l)

The complete ionic equation is;

2H^+(aq) + SeO3^2-(aq) + 2K^+(aq) + 2OH^-(aq)-----> 2K^+(aq) + SeO3^2-(aq) + 2H2O(l)

Net ionic equation;

2H^+(aq) + 2OH^-(aq)-----> 2H2O(l)

We can clearly see that this is a neutralization reaction hence water is the product of the net ionic equation.

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Answer:

6.60

Explanation:

Answer:

Molarity: concentration measured by the number of moles of solute per liter of solution 3)

Explanation:

According to molar concentration, molarity of solution is 1.104 moles per liter and molar mass is 160.437 g/mole.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Molarity  of solution is obtained as, 22.2/160.437×1/0.125=1.104 moles per liter.Molar mass of  LiClO₄.3 H₂O is 160.437 g/mole.

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Answer:

Soils Y

Explanation:

• The soils with lower pH are acidic so they react readily with powdered.

[tex].[/tex]

Answer:

SOIL Y

the soil with lower ph are acidic

Answer:

a) 2Ba + O2 → 2BaO

b) 2HCl + Mg → MgCl2 + H2

c) 2HCl + CuO → CuCl2 + H2O

d) Fe + O2 → Fe2O3

Explanation:

Okay so for

a), you must add 2 at the front of Ba and BaO bcuz you're gonna need your equation balanced.

like as you can see, O has 2 so yeahh, you've got to balance it nicely.

b) you must add 2 in front of HCl bcuz the Cl and H after the reaction happened has 2 in them, were talking about balancing so XD

c) and yes again, you're gonna have to add 2 in front of HCl bcuz of the same reason as b).

d) D is definitely a special case bcuz, Fe3+ with O2, so well if you do the cross multiplication technique you'll automatically get Fe2O3. Yas that's it.

English is not my first language so it's hella tuff to explain it to you from in much more detailed perspective T-T Sorry (´∩｡• ᵕ •｡∩`)

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.13 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.13}{6.02} \\ = 0.519933[/tex]

We have the final answer as

Hope this helps you

Aldehydes and Ketones. Aldehydes and ketones are classes of organic compounds that contain a carbonyl (C=O) group.

that's the correct answer

can I get brainilest

Answer:

H2S

Explanation:

the oxidation number of S is -2.

Answer:Lower

Explanation:

( just had the question on ck12.)

Elements in the alkaline earth metal family of the periodic table have lower electronegativity values than elements in the halogen family of the periodic table as they have less electrons in their valence shell.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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If the number of neutrons in the nucleus of the atom is 41, and the atomic number is 40, the mass number of that atom will be 81

Mass number is the sum of the number of protons which is the atomic number and neutrons of an atom.

It is represented using the letter ‘A.’

Mass number = atomic number + neutrons

We have the atomic number as 40 and the number of neutrons as 41

The mass number = 40 + 41 = 81

Therefore, the mass number of the atom will be 81

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Answer:

D

Explanation:

It means entry by force.

Answer:

If two atoms get close together then the electrons of each atom will get attracted to the other one and bc one atom lose electrons gets a positive charge and the one with more electrones will get a negetive charge

Explanation:

brailiest pls pls pls

Answer:

H2SO4

Explanation:

because it's not more acidic

         Both sulfuric acid and hydrochloric acid are potent acids, but hydrochloric acid is stronger. Because HCl is monoprotic and H2SO4 is diprotic, they differ mostly in their acid types.

     Instead of using hydrochloric acid, sulphuric acid (H 2 SO 4) is preferred because: This acid is commonly utilized for a variety of neutralization reactions. Sulphuric acid is more potent than all other acids and is also simpler and safer to use. Even if there is a risk for negative reactions, they are uncommon.

      The majority of the time because it is for a redox reaction or titration in which HCl would react to produce chlorine on its own. You could use phosphoric or sulfuric acid.

       In this situation, H 2 SO 4 is preferable to HCl. Due to the considerable acidity of H 2 SO 4, the solution is made to be more acidic than HCl. As a result, the findings of titration using H 2 SO 4 are more precise. H 2 SO4 generates two hydronium ions, whereas HCl only generates one.

         It shows how many protons split apart to create hydronium ions. The acid will be more potent the lower the pKa value. Therefore, we can conclude that HCl is more acidic than H2S O 4.

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★ « Synthetic reactions in Citric Acid Cycle » ★

hope it is

Answer:

group 1 element 6

group 2 element 3

group 11 element 1

group 14 element 2

group 17 element 4

group 18 element 5

Explanation:

Answer:

Explanation:

group 1 element 6

group 2 element 3

group 11 element 1

group 14 element 2

group 17 element 4

group 18 element 5

Answer:

lithosphere (land)

hydrosphere (water)

biosphere (living things)

atmosphere (air).