How many pi bonds are in the oxalate ion (C2O42-)?

Answer:

No

Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride

Answer: 43.73 seconds

Explanation:

Half-life of indium = 14.10 sec

First we have to calculate the rate constant, we use the formula :

[tex]k=\frac{0.693}{t_\frac{1}{2}}[/tex]

[tex]k=\frac{0.693}{14.10}=0.0491sec^{-1}[/tex]

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant  

t = age of sample = ?

a = initial amount of the reactant = 7.70 mg= [tex]7700\mug[/tex]  

 [tex](1mg=1000\mug[/tex]

a - x = amount left after decay process = [tex]900\mug[/tex]

Now put all the given values in above equation, we get

 [tex]t=\frac{2.303}{0.0491}\log\frac{7700}{900}[/tex]

[tex]t=43.73sec[/tex]

Thus it would take 43.73 seconds sample to decay from 7.70 mg to 900 µg.

Answer: 28

Explanation:

Answer:

the Glancing angle is the angle between the incident ray and plane mirror which is 90o in the given case. The angle between the direction of the incident ray and the reflected ray is the angle of deviation. Since the angle of deviation for a plane mirror is twice the glancing angle, the angle of deviation is 1800.

Answer:

No it is not balanced

Explanation:

CaCl2 + 2NaHCO3 → CO2 + CaCO3 + H2O + 2NaCl

Hope this helps

When rocks are subjected to high heat, high pressure, hot mineral-rich fluids, or, more typically, some combination of these variables, metamorphic rocks develop.

Rocks are defined as those formed from magma, a molten mixture of rock-forming minerals and typically volatiles such as gases and steam.

There are three types of rocks.

Thus, when  rocks are subjected to high heat, high pressure, hot mineral-rich fluids, or, more typically, some combination of these variables, metamorphic rocks develop.

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Answer:

B

Explanation:

You add them all together if I'm correct. (I'm in middle school so don't get mad if its wrong lol)

Answer: 4) 2.5

Step-by-step explanation:

The ratio of line segments as per picture

5/x = 4.6/2.3

x = 2.5

Correct option is

4) 2.5

Explanation:JK ITS     B.

Answer: 0.811m

Explanation: Molarity is the moles of solute present per kg of solvent.

Molar mass of C10H8 = . 128.17 g/mol

No. of moles = given mass/molar mass

11.2g C10H8 = 11.2/128.17 g/mol C10H8

= 0.0874 mol C10H8

NOW 107.8g solvent (chloroform) contains 0.0879 molecules (naphthalene)

1000g   ''    will contain (0.0879/107.8 x 1000) mole solute

= 0.811 mole

Molarity of the solution is 0.811 m (option A)

Answer:

[tex]\Delta U=-1,441J[/tex]

Explanation:

Hello!

In this case, since the first law of thermodynamics explains how the heat added to the system and the work done by the system equals the change in the internal energy of the system, we can write:

[tex]\Delta U=Q-W[/tex]

Next, since the system releases 241 J of energy (negative on the previous equation) and does 1.20 kJ (1200 J) of work, the change in the internal energy turns out:

[tex]\Delta U=-241kJ-1,200kJ\\\\\Delta U=-1,441J[/tex]

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Above 100°Celsius is the temperature at which the substance is converted into a gas.

Different liquids have different boiling points at which they change from liquid to gaseous state. The boiling point of water is 100°Celsius means at 100°Celsius or above temperature, the water changes from liquid form into gas form or vapour form so we can conclude that at high temperature i.e. above 100°Celsius the substance is converted from liquid state to gaseous state.

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Answer:

A

Explanation:

Why not

Answer:

A on edge 2021

Explanation:

Answer:

Neon

Mass Number Half-life Decay Mode

Electron Capture

Electron Capture with delayed Proton Emission

18 1.6670 seconds Electron Capture

19 17.22 seconds Electron Capture

Answer:

I am the one who you just got a 100 points from from the 100 Point giveaway. I guess I gave away all my points except for one, so I need more points so I hope you don't mind if I am writing this, because you won't get another person to answer. Sorry!

Explanation:

Answer:

the correct answer is calcium becuase it is over 200.

Explanation:

please mark brainlest and have a good day :)

Answer:

B- Sodium loses an electron.

D- Fluorine gains an electron.

Sodium is oxidized.

Explanation:

The reaction equation is given as:

        Na  + F →  NaF

In this reaction, Na is the reducing agent. It loses an electron and then becomes oxidized. By so doing, Na becomes isoelectronic with Neon.

Fluorine gains the electron and then becomes reduced. This makes fluorine also isoelectronic with Neon.

This separation of charges on the two species leads to an electrostatic attraction which forms the ionic bonds.

Answer:

d. Electrons would be ejected and they would have greater kinetic energy than those ejected by yellow light.

Explanation:

A formula that describes the kinetic energy of an electron ejected when a surface is truck by light is:

As you see, the higher the energy of the photon striking the surface, the higher the kinetic energy of the ejected electron.

Ultraviolet light has more energy than yellow light, so it would cause the ejected electron to have greater kinetic energy as well.

Answer:

The resulting solution is basic.

Explanation:

The reaction that takes place is:

First we calculate the added moles of HNO₃ and KOH:

As there are more KOH moles than HNO₃, the resulting solution is basic.

The resulting solution is basic.

• It is known that KOH is a base and HNO3 is an acid, so when they mix they undergo a neutralization reaction.  

• The reaction between there will be,  

HNO3 + KOH ⇔ KNO3 + H2O

Based on the given information,

• The volume of HNO3 is 12.5 ml and the molarity is 0.280 M, and the volume of KOH is 5 ml and the molarity is 0.920 M.

Now 1 mole of HNO3 completely reacts with 1 mole of KOH,

The millimoles of HNO3 is,

[tex]= Molarity * Volume (in ml)\\= 0.280 * 12.5\\= 3.5 mmol[/tex]

The millimoles of KOH is,

[tex]= Molarity * Volume (in ml)\\= 0.920 * 5.0\\= 4.6 mmol[/tex]

Now it can be seen that 3.5 millimoles of HNO3 completely reacts with 3.5 millimoles of KOH. Now we are left with 4.6-3.5 = 1.1 mmol of KOH.

Thus, KOH is in excess amount present in the solution, and as it is basic in nature, therefore, the resultant solution would be basic in nature.

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Answer:

Explanation:

They have the ability to learn and adapt to the environment. ... Our youth can bring social reform and improvement in society. We cannot make do without the youth of a country. Furthermore, the nation requires their participation to achieve the goals and help in taking the country towards progress

Answer:

The elements in the periodic table are arranged in order of increasing atomic number. All of these elements display several other trends and we can use the periodic law and table formation to predict their chemical, physical, and atomic properties. Understanding these trends is done by analyzing the elements electron configuration; all elements prefer an octet formation and will gain or lose electrons to form that stable configuration.

Please give me brilliant answer

Answer:

can u give the bond energies

Answer:

6moles of Li : 1 mole of N₂

Explanation:

The reaction equation is given as:

        6Li   +   N₂  →   2Li₃N

Mole ratio of Li to N₂;

From the balanced reaction equation:

    6 moles of Li will react with 1 mole of N₂;

The mole ratio is:

      6moles of Li : 1 mole of N₂

Answer:

Both objects are moving.

Explanation:

Object 1 is moving because the unbalanced force acting on the skateboard is causing it to either move slower or move faster. An example of this is when the skateboard is going down the hill. The unbalanced force is caused by the gravity which speeds up the skateboard.

Object 2 is also moving although it has a balance force; however, it is moving at a "constant speed." This is because the force of thrusting forward is being counteracted by a friction force of the same magnitude. Forces that are equal in magnitude and of opposing directions causing the speed to be constant. So, the bicycle is still moving.

Answer:

108.43 grams KNO₃

Explanation:

To solve this problem we use the formula:

Where

We solve for b:

Using the given volume of water and its density (aprx. 1 g/mL) we calculate the necessary moles of KNO₃:

Finally we convert KNO₃ moles to grams, using its molecular weight:

Answer:

Phosphorus

Explanation:

In given diagram there are 15 electrons are present. Which means it is orbital diagram of phosphorus.

The atomic number of phosphorus = 15

Number of electrons = 15

Electronic configuration of phosphorus:

P₁₅ = 1s² 2s² 2p⁶ 3s² 3p³

All other options are incorrect because:

Calcium have 20 electrons.

Electronic configuration of Ca:

Ca₂₀ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Hydrogen have one electron.

Electronic configuration of H.

H₁  = 1s¹

Magnesium have 12 electrons:

Electronic configuration of Mg:

Mg₁₂ = 1s² 2s² 2p⁶ 3s²

Answer:

H2O

Explanation:

H2O is just given as a covalent compound... Usually covalent bonds occur between 2 or more nonmetals.

Water or H₂O is a compound which has covalent bonds as there is slight difference in electronegativity of hydrogen and oxygen atoms.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Answer:

Explanation:

First divide 25.0 by 6.5 to get the amount of fuel you have.  

Answer:

The maritime tropical air mass keeps temperatures in Florida in the 80s and 90s in summer and in the 70s and 80s in winter. It can be pushed south by large continental polar and maritime polar air masses from the north and is affected by the reduced sunlight in winter.

Explanation:

There are different types of air masses based on the region from there they originates. Florida usually experience maritime and tropical air masses.

A huge body of air with a somewhat constant temperature and humidity is referred to as an air mass. Air mass source regions are the places where air masses originate.

For a sufficient amount of time, air will absorb the characteristics of the surface beneath it. The best source regions are those that are uniformly flat and composed. Siberia, central Canada, seas, and vast deserts are a few examples.

Tropical air masses are identified by a capital "T" for tropical. They originate in warm, tropical climates. A capital "A" for arctic is used to identify air masses that originate there. Dry air masses from the continental origin are those that originate over land.

Florida's northern and central regions experience a humid subtropical climate. The climate in South Florida is tropical. Hence tropical air masses are found in Florida.

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Answer:

Convection

Explanation:

Hot water will rise due to heat transfer by convection occurring in the heating system.