An exothermic reaction
.
In an endothermic reaction, the energy of the products is
the energy of the reactants.
Activation energy is
the potential energy of the products.

Answer:

you will add then subtract to get the answer

Answer:

1720 MeV

Explanation:

Thorium has 90 protons and 142 neutrons

The mass of each proton is 1.007277 amu

The mass of each neutron is 1.008665 amu

The mass of 90 protons is 90 * 1.007277 amu = 90.65493 amu

The mass of 142 neutrons is 142 * 1.008665 amu = 143.23043 amu

Total calculated mass of nucleons = 90.65493 amu + 143.23043 amu = 233.88536

Mass defect = 233.88536 amu - 232.038 amu = 1.84736 amu

We convert from amu to MeV using the conversion factor of 931

Binding energy = 1.84736 amu * 931 = 1720 MeV

Answer:

The formal charge on P would be 0 for this structure.

Explanation:

oyegen and hydrogen

4 oxegens

Answer:

Oxygen

Explanation:

Answer:

B

Explanation:

The geometry of the BF3 molecule is called trigonal planar

Answer:

bf3 is a trigonal shape

Explanation:

no.of pairs = v+m-c+a/2

then it ' ll get 3

so sp2 hybridization

sp2 is a trigonal planar

Answer:

B. A tertiary alcohol; a secondary alcohol

Explanation:

Grignard reagent has a formula RMgX where X is a halogen, and R is an alkyl or aryl group.

Grignard reagent reacts with aldehydes and ketones to form alcohol. However the classification (that is; Primary, secondary and tertiary)  varies depending on which it reacts with.

2-butanone is a ketone.

Ketones reacts with Grignard reagent to form tertiary alcohol

Butanal is an aldehyde.

Aldeyde reacts with grignard reagent to form Secondary alcohol

The answer is; Tertiary alcohol; Secondary alcohol

Answer:

It takes 30 minutes to feel the effects of alcohol.

Explanation:

It may take an hour to metabolize a drink, but it takes approximately thirty minutes before you feel alcohol's effects. This is a good gauge for pacing yourself. Drinking more than one drink every 30 minutes means you are probably drinking too much, too fast.

Answer:

1.626 M

Explanation:

Let's start by calculating how many grams of C₂H₆O₂ are there per mL of solution:

So the C₂H₆O₂ concentration can be expressed as 0.1008 g/mL.

Now we convert g/mL to molarity, using the molar mass of C₂H₆O₂:

(1 mL = 0.001 L)

The molarity of the solution is given as 1.626M

We can calculate the mass of C₂H₆O₂ in  mL of solution:

1 mL of solution weighs 1.40 g.

1.40 g of solution × 0.072/1

=0.1008 g C₂H₆O₂

C₂H₆O₂ concentration =  0.1008 g/mL.

Conversion of  g/mL to molarity

0.1008 g C₂H₆O₂ ÷ 62 g/mol = 1.626x10⁻³ mol C₂H₆O₂

(1 mL = 0.001 L)

1.626x10⁻³ mol C₂H₆O₂ / 0.001 L = 1.626 M

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Answer:

A dichotomous key is a tool that allows the user to determine the identity of items and organisms in the natural world. ... In each step, the user is presented with two statements based on characteristics of the organism. If the user makes the correct choice every time, the name of the organism will be revealed at the end

Explanation:

Answer:

ok thx for the imformation can you help me with my qustion

Explanation:

Due to their comparable chemical activity, the periodic table's vertical columns are referred to as groups or families. The number of valence electrons and chemical characteristics are the same for all members of a family of elements.

The vertical columns of the periodic table also have a unique name. A group is what we call each column.

Each set of elements has an equal number of electrons in the outer orbital. The outer electrons are sometimes referred to as valence electrons.

The same valence shell electron arrangement gives the elements in the same group comparable chemical characteristics.

Because the valence shell electron configuration of the elements changes gradually along the row, the elements exhibit a gradual change in their chemical characteristics.

Therefore, elements in a vertical column on the Periodic Table have similar properties.

Learn more about similar properties here:

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This question is incomplete, the complete question is;

The rate constant for the reaction 3A equals 4B is 6.00 × 10⁻³ L.mol⁻¹min⁻¹.

how long will it take the concentration of A to drop from 0.75 to 0.25M ?

from the unit of the rate constant we know it is a second reaction order

OPTIONS

a) 2.2×10^−3 min

b) 5.5×10^−3 min

c) 180 min

d) 440 min

e) 5.0×10^2 min

Answer:

it will take 440 min for the concentration of A to drop from 0.75 to 0.25M

Option d) 440 min is the correct answer

Explanation:

Given that;

Rate constant K =  6.00 × 10⁻³ L.mol⁻¹min⁻¹

3A → 4B

given that it is a second reaction order;

k = 1/t [ 1/A - 1/A₀]

kt = [ 1/A - 1/A₀]

t = [ 1/A - 1/A₀] / k

K is the rate constant(6.00 × 10⁻³)

A₀ is initial concentration( 0.75 )

A is final concentration(0.25)

t is time required = ?

so we substitute our values into the equation

t = [ (1/0.25) - (1/0.75)] / (6.00 × 10⁻³)

t = 2.6666 / (6.00 × 10⁻³)

t = 444.34 ≈ 440 min     {significant figures}

Therefore it will take 440 min for the concentration of A to drop from 0.75 to 0.25M

Option d) 440 min is the correct answer

Answer:

Explanation:

O5Cl

Answer:

A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells

Explanation:

Beryllium (Be) is an element in group two of the periodic table with atomic number 4 (Is2 2s2). On the other hand, barium (Ba) is an element in group 2 of the periodic table with atomic number 56. However, as stated in the question, the Beryllium (Be) atom is smaller than the Barium (Ba) atom.

This is because a Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells. The electron shells of Barium contains more electrons, which is responsible for the large size of the Barium atom. Note that, the higher the number of atoms, the larger the atomic size.

Answer:

drive an electric car to work, walk to work, carpool to work

Explanation:

The orders of the activities from the greatest to least impact to reduce consumption of fossil fuels, is one in which the least fossil fuel is used;

Answer:c

Explanation:

Answer:

Heterogeneous

Explanation:

not clear explanation sooory

Answer:Frogs breathe through gills underwater to get oxygen and when frogs are adults they breathe through their lungs to get oxygen.

Explanation:

Answer:

c are there 93.5 of c yan siguro

Answer:c

Explanation:

Answer:

a aa aaa aaaa aaaaaa

Explanation:

Answer:

Explanation:

ammonite

Answer:

Ammonite

Explanation:

These are some awesome fossils

Plz mark B R A I N L I E S T

Answer:

It is Though the transfer of charges from one object to another, or (A).

Answer:

C

Explanation:

Warm water is heated by the Gulf Stream, a warm air current that originates in the Gulf of Mexico. As the warm water moves north, it forces cooler water to sink and move south.

the reason of which I do not believe it is a Rip Tide is because rip tides have been found in both several rivers and oceans, if not all.

Answer:

41 mL

Explanation:

Given data:

Milliliter of HCl required = ?

Molarity of HCl solution = 4.25 M

Mass of CaCO₃ = 8.75 g

Solution:

Chemical equation:

2HCl + CaCO₃      →    CaCl₂ + CO₂ + H₂O

Number of moles of CaCO₃:

Number of moles = mass/molar mass

Number of moles = 8.75 g / 100.1 g/mol

Number of moles = 0.087 g /mol

Now we will compare the moles of  CaCO₃ with HCl.

                      CaCO₃         :          HCl

                          1               :            2

                      0.087           :         2/1×0.087 = 0.174 mol

Volume of HCl:

Molarity = number of moles / volume in L

4.25 M = 0.174 mol / volume in L

Volume in L = 0.174 mol /4.25 M

Volume in L = 0.041 L

Volume in mL:

0.041 L×1000 mL/ 1L

41 mL

Answer:

I think it's Physical, Chemical, then Physical

Explanation:

I hope I'm right, those answers sound about right to me

Answer:

c) removing fluoride ions.

Explanation:

Hello!

In this case, for this solubility product problem, it is very convenient to write the undergoing ionization reaction:

[tex]CaF_2(s)\rightleftharpoons Ca^{2+}(aq)+2F^-(aq)[/tex]

In such a way, via the Le Chatelier's principle, we remember that the addition of reactants shifts the reaction towards products, adding products shifts the reaction towards reactants, removing reactants shifts the reaction towards reactants and removing products shifts the reaction towards products. In means, that the best way to shift this reaction away from solid calcium fluoride and toward the dissolved ions is c) removing fluoride ions, because it is a product and its removal favors the formation of more products.

Best regards!

Answer:

the answer is A

Explanation:

since during a cold front the cold air replaces the warm air

Answer:

during a cold front, cold air mass is replaces a warm air mass.

Explanation:

hope this helps

Answer:

true

Explanation:

Answer:

carbon dioxide

Explanation:

An example of a compound from the given choices is carbon dioxide.

A compound is any substance composed of two or more atoms /elements joined together in a definite grouping .

Answer:

ferns

Explanation:

e d g e n u i t y  sucks dunnit?

Answer:

Mass is the amount of matter in an object. The distance is how far apart two places are from each other. They are related because the more mass the more gravitational force as then there is more pressure and then the gravitational force attracts the two objects closer. The more distance, the less the gravitational force as then the gravitational force will have more trouble attracting the two objects toward each other.

Answer:

Biomass

Explanation:

It is Biomass because biomass is a Renewable and organic energy that is gotten from living things to generate sustainable electric energy. The farmer with corn and herds of cows has biomass energy resources because it is gotten from living things both plants and animals. The materials use for biomass gotten from plants and animals are woods, barks, straw, animals dung,gases produced by animals e.t.c.