Can someone answer 4 for me please?

Answer:

Most elements are Solids at room temperature

Answer:

0.0457 M

Explanation:

The reaction that takes place is:

First we calculate how many moles of acid reacted, using the HBr solution's concentration and volume:

Now we convert HBr moles to Ca(OH)₂ moles, using the stoichiometric ratio:

Finally we calculate the molarity of the Ca(OH)₂ solution, using the given volume and calculated moles:

Answer:

Explanation:

what are tho anwser choices

Answer:

Explanation:

The magnitude of the current can be found by using the formula

[tex]i = \frac{v}{r} \\ [/tex]

v is the voltage

r is the resistance

From the question we have

[tex]i = \frac{12}{3} = 4 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

4A

Explanation:

Answer: True

Explanation:

Answer:

pressure will be high because the temp is high, the gas is gonna expand

Explanation:

when temp increases it causes gas to expand which causes high pressure. this is because pv=nrt, p=pressure in atmosphere, v is volume in liters, n is number of particles in moles, t is temp in kelvin is r is ideal gas constant

The impact on the pressure should be high since the temperature should be high due to which the gas should be expanded.

Pressure refer to the force applied that should be perpendicular to the surface of an object per unit area so that the force is distributed. In the case when the temperature should be increased so here gas should be expanded that resulted into the high temperature.

Here the following formula should be applied

pv = nrt

Here p = pressure

v means the volume

n means no of particles in moles

r means the ideal gas constant

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Answer:

maybe is b but wait to other people answer

Answer:A. deposition B. condencation

Explanation:

Answer:

5.4 g Na

Explanation:

Calculate the mass of sodium chloride from both reactants. The lesser value is the amount is the theoretical yield. Subtract the mass of the calculated mass of sodium chloride from the mass of the reactants.

Answer:

The valence electrons of nitrogen in its compounds are all sp³ hybridized orbitals. The formal charge on N is usually -1 for an anion, 0 for a neutral compound, and +1 in cations. A nitrogen atom with a formal charge of -3 would correspond to a nitride ion, N³⁻, which is strongly basic in aqueous solution. Hope this helps...

Explanation:

Brainliest please?

Answer:

solid X contains only ionic bond, and solid Y contains only covalent bonds.

Explanation:

solid X contains only ionic bond, and solid Y contains only covalent bonds. Because ionic compounds they have high melting point compared to covalent compounds, ionic compound they are generally insoluble in non polar solvent such as toluene but soluble in polar solvent such as water, ionic compound they conduct electricity.

Answer: e. 4.8 h

Explanation:

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 = let initial amount of the reactant  

a - x = amount left after decay process  

a) for rate constant

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

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

[tex]k=\frac{0.693}{0.77hr}=0.9hr^{-1}[/tex]

b) for 160.0 g to decay to 2.07 g

[tex]t=\frac{2.303}{0.9}\log\frac{160.0}{2.07}[/tex]

[tex]t=4.8hr[/tex]

The time  required for a 160.0-g sample of 158Eu to decay to 2.07 g is 4.8 hours

Answer:

E) 0.0207

Explanation:

The molal concentration, m, is defined as the ratio between moles of solute (In this case, KBr) per kg of solvent (water):

Moles KBr -Molar mass: 119g/mol-

2.21g KBr * (1mol / 119g) = 0.01857moles

Mass solvent:

897g * (1kg / 1000g) = 0.897kg

Molal concentration:

0.01857 moles / 0.897kg =

0.0207m

Right solution is:

Answer:

9.26g of BaSO₄ are formed

Explanation:

The reaction of Ba(OH)₂ with H₂SO₄ is:

Ba(OH)₂ + H₂SO₄ → BaSO₄ + 2H₂O.

To solve this question we need to determine the moles of each reactant in order to find the limitng reactant. With the moles of limiting reactant we can find the theoretical moles of BaSO₄ produced and its mass, as follows:

Moles Ba(OH)₂:

50.0mL = 0.050L * (1.00mol / L) = 0.0500moles

Moles H₂SO₄:

83.5mL = 0.0835L * (0.475mol / L) = 0.0397moles

That means limiting reactant is H₂SO₄.

Based on the reaction, 1 mole of H₂SO₄ produce 1 mole of BaSO₄. The theoretical moles of BaSO₄ produced are 0.0397 moles.

The mass is (Molar mass BaSO₄: 233.38g/mol):

0.0397 moles BaSO₄ * (233.38g / mol) =

600 and 1,300 degrees Celsius

In pretty sure

Answer:

C. disposition and condensation ​

Explanation:

Answer:

V₂ = 520.42 mL

Explanation:

Given data:

Initial volume = 350.0 mL

Initial pressure = 840 mmHg

Initial temperature = 33°C (33 +273 = 306 K)

Final temperature = 52°C (52+273 = 325 K)

Final volume = ?

Final pressure = 600 mmHg

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 840 mmHg × 350.0 mL × 325 K / 306 K × 600 mmHg

V₂ = 95550000 mmHg.mL.K /183600 K.mmHg

V₂ = 520.42 mL

Answer:

H2O

Explanation:

There is more than one element

Answer:

7.52 x 10²³ molecules N

Explanation:

multiply 1.25 mol of N2 by Avogadro's Number

Answer:

The answer is 4.80 x 1014s-1b

Explanation:

625 nm x 10-9m= 6.25 x 10-7 m = c = 2.998 x 108m/s1 nm 6.25 x 10-7m=4.80 x 1014s-1b.)

The frequency of visible light is equal to 4.8 ×10¹⁴s⁻¹.

Frequency can be described as the number of oscillations of a wave in a time of one second. The frequency of the wave or light has S.I. units which are per second (s⁻¹) or hertz.

Wavelength can be defined as the distance between the two adjacent points of a wave in the phase with each other. Two adjacent crests or adjacents troughs on a wave are separated by a distance is called wavelength.

The relationship between the speed of light, frequency, and wavelength is:

c = νλ

Given, the wavelength of the light, λ = 625nm = 625 × 10⁻⁹ m

Then we know that the speed of light, c = 3 × 10⁸ ms⁻¹

The frequency of the light can be calculated from the above-mentioned equation:

The frequency of the given visible light will be equal to:

ν = c/λ = 3× 10⁸ ms⁻¹/625 × 10⁻⁹ m = 4.8 ×10¹⁴ Hz

Therefore, the frequency of visible light is equal to 4.8 ×10¹⁴ Hz.

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Answer:

A

B

E

Explanation:

"Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei

and fusion is the process where two light nuclei combine together releasing vast amounts of energy"

a process that releases energy is respiration

Answer:

1.28

Explanation:

Al = aluminium

Density of Al = 2.7g/cm³

Density of Al2O3 = 4g/cm³

Molecular weight of Aluminum = 27g/mol

Molecular weight of Al2O3= 101.96 g/mol

Pilling bedworth ratio = Rob

= M(Al2O3) * density of Al / n* molecular weight of Al * density of Al2O3

= 101.96g/mol x 2.7g/cm³/2x 27g/mol x 4g/cm³

= 275.292/216

= 1.28

From the calculation above 1.38nis the PB ratio for aluminum

Answer: If the gold in the crown was mixed with a less-valuable metal such as bronze of copper then this affects its density by making it to weigh even more and if it weighs more then it has less of chance to float. Observe: Drag each of the crowns into the liquid.

Explanation:

Density can be defined as the compactness of any substance. It is the mass/volume of a substance.

Thus, if the gold crown is mixed with cheaper substances, such as bronze and copper, the density of the crown will decrease and it will become lighter.

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Answer:

a yellow precipitate is formed when mixed together

A student in chemistry class mixes two clear solutions together. Then, a Yellow precipitate is formed when mixed together.

A particular kind of homogenous combination made up of two or more components is known as a solution. A solute is a material that has been dissolved in a solvent, which is the other substance in the combination.

In a combination called a solution, every component is well combined. Solutions can contain solids, liquids, and gases and are regarded as homogenous mixes. A solute plus a solvent makeup a solution. Any material that dissolves in a solvent is referred to as a solute.

Solid, liquid, and gaseous solutions can be classified as solutions based on the physical states of the solvent and solute. Both the solute and the solvent are in the solid state in solid solutions.

Thus, option C is correct.

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Answer:

See explanation

Explanation:

The molecular orbital configuration of the super oxide ion is;

σ1s2, σ*1s2, σ2s2, σ*2s2, σ2px2, π2py2, π2pz2, π*2py2, π*2pz1

The molecular orbital configuration of the peroxide ion is;

σ1s2, σ*1s2, σ2s2, σ*2s2, σ2px2, π2py2, π2pz2, π*2py2, π*2pz2

Hence the bond order of the superoxide ion is 1.5 while the bond order of the peroxide ion is 1.

The superoxide ion is paramagnetic while the peroxide ion is diamagnetic.

Since the superoxide ion has a greater bond order and will have resonance structures as a result of its fractional bond order, it is more stable than the peroxide ion.

Answer:

3. Answer= Neon (Ne) is the Group 8A chemical element that has atomic number 10 and mass 20.1797.

Answer:

4A

Explanation:

on the periodic table

Answer:

London dispersion forces

Explanation:

There are different forces of attraction that helps to hold atoms or Molecules of a particular substance together. Some of the forces of attraction are ionic/ electrovalent bond, covalent bond, vander waals forces of attraction and so on.

Under the vander waals forces of attraction we have what is known as the London dispersion forces. This force of attraction is a very weak and it is commonly found in the atoms of noble gases.

The intermolecular force of attraction in which we are talking about that is london dispersion forces is formed as a result of the formation of non-polar dipoles which are not permanent.