Which is the electron configuration for bromine?
A) 1s22s22p63s23p64s23d104p5
B) 1s22s22p63s23p64s23d104p6
C) 1s22s22p63s23p44s23d104p5
D) 1s22s22p63s23p64s23d94p5

Answer:

It's A

Explanation:

I took the test. For A p e x

[tex]density = \frac{mass}{volume} [/tex]

1. density = 57/300

= 0.19 g/ml

2. density = 57/12

= 4.75 g/ml

3. density = 15/3

= 5.0 g/ml

Answer:

Explanation:

Momentum has the formula of kg m/s and is represented by m*v

Formula

momentum= mv

Givens

m =??

v = 7 m/s

mv = 98 kg m/s

Solution

98 = 7 * m

98/7 = m

m = 14 kg

-2.5089 kJ is the amount of heat is released by the combustion of the naphthalene.

Released amount of heat is calculated by using the below formula:

Q = -mcΔT, where

m = mass of naphthalene = 0.25g

c = specific heat of calorimeter = 4.13 kJ/°C

ΔT = change in temperature = 26.43°C - 24°C = 2.43°C

Putting all these values in the above equation, we get

Q = - (0.25 × 4.13 × 2.43) = - 2.5089 kJ

Hence, - 2.5089 kJ heat is released.

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Answer:

Neutral

Explanation:

Neutralization reaction gets its name from the fact that the products of the reaction are _____.

neutral

The formula unit of compound made up from Pb4+ and oxygen is PbO2.

The formula unit for a compound made from Pb⁴⁺ and oxygen is PbO₂. Therefore, option (1) is correct.

A formula unit represents the lowest whole number ratio of ions in an ionic compound. The formula mass of a substance is the sum of the atomic masses of the ions present in the formula unit of an ionic compound.

Formula unit is the empirical formula of any covalent or ionic solid compound which is used as an independent entity for stoichiometric calculations. Formula mass is also defined as the sum of atomic masses of constituent atoms in an ionic compound.

A molecule is made up of two or more elements that are covalently bonded. Also, the molecular mass gives the mass of a molecule relative to that of a carbon twelve atom which has a mass of twelve units.

As we know the valency of lead is 4 and the valency of oxygen is 2. To satisfy the valency of each other two oxygen combine with one lead (IV). Therefore, the formula unit of the compound is PbO₂.

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Answer:

D) Ba < Pb < P

Explanation:

Barium (Ba): 5,2117

Lead (Pb): 7,4167

Phosphorus (P): 10,4867

Answer:

Metal ions are fundamental elements for the maintenance of the lifespan of plants, animals and humans. Their substantial role in biological systems was recognized a long time ago. They are essential for the maintenance of life and their absence can cause growth disorders, severe malfunction, carcinogenesis or death

Explanation:

:)

Answer:

Potential energy is the energy possessed by an object because of its position with respect to a reference.

Explanation:

The energy obtained because of its location or position is called potential energy.

》Example:

Water in a dam stores potential energy because of its height.

~ Happy Learning

°• Answer By Yoland •°

Answer:

Blue

Explanation:

Blue would have the longest wave length because following ROY G BIV the wave length distance between the two decreases as you move from Red to Violet.

Answer: D. A chemical reaction releases thermal energy.

Explanation:  

Hope this helps! <3 :)

The equilibrium constant for the given reaction is 0.0421.

Equilibrium constant of any reaction is define as the ration of the product of concentration of products to the product of the concentration of reactants, with raise to the respective coefficients.

Given chemical reaction is:
PCl₅ → PCl₃ + Cl₂

The equilibrium constant's for this reaction is:

Kc = [PCl₃] [Cl₂] / [PCl₅], where

Concentration of [PCl₃] = 0.020M

Concentration of [Cl₂] = 0.020M

Concentration of [PCl₅] = 0.0095M

Putting all these values in the above equation we get,

Kc = (0.02 x 0.02) / 0.0095 = 0.0421

Hence, 0.0421 is the equilibrium constant.

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Answer:

A on edg

Explanation:

im doin it rn

Answer:

covalen and ionic compound

Answer:

The transition elements have their valence electrons in two different sets of orbitals that are (n-1)d and ns. Thus, transition elements show variable valencies due to the involvement of penultimate d shell electrons.

Explanation:

Answer:

B. The forces holding atoms together are stronger in a liquid than in

a gas

I hope that this helps!

Answer:

Is there any options?

Explanation:

Answer:

Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. Reduction is the gain of electrons or a decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule.

Explanation:

To solve such this we must know the concept of redox reaction. Therefore, The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Oxidation and reduction reaction involves gain of electron and loss of electron simultaneously. This type of reaction is called redox reaction. The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.

Therefore, the cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.

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Answer:

thats alot and makes no since

Answer:

With the cooler water at the bottom, this uneven temperature distribution creates convection currents that accelerate the cooling process. Even with more ground to cover to freeze, the temperature of the hotter water can drop at a faster rate than the cooler water.

Explanation:

it cannot be passed to the next generation meaning A chromosome will be eliminated

Answer:

Random

Explanation:

Materials have numerous domains. Domains have a north and south side. In magnetic metals, all of the domains are pointed in the same direction. This creates an overall magnetic field that gives the material its magnetic property.

On the other hand, non-magnetic materials still have domains but they don't face the same direction. Instead, they are randomly directed. This means that the material cannot have the same magnetic properties that ferromagnetic materials have.

Answer:

The function of the cathode ray tube is to convert an electrical signal into a visual display. Cathode rays or streams of electron particles are quite easy to produce, electrons orbit every atom and move from atom to atom as an electric current.

Reactant concentration, the physical state of the reactants, surface area, temperature, and the presence of a catalyst are the four factors to influence the rate of a homogeneous reaction.

The term rate of reaction is defined as the speed at which a chemical reaction takes place. It is also defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.

Surface area, greater surface area, more collisions are available and then concentration, when increase the concentration then increase the likelihood of reactants colliding. Catalysts increase reaction without itself getting used up.

Thus, The factors to influence the rate of a homogeneous reaction are Reactant concentration, the physical state of the reactants, surface area, temperature, and the presence of a catalyst.

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Answer:

no (units don't cancel each other out)

yes (convert both to same unit and multiply)

yes (multiply)

Explanation: