Can someone answer 1
For me please?

Answer:

7.52 x 10²³ molecules N

Explanation:

multiply 1.25 mol of N2 by Avogadro's Number

Answer:

Explanation:

T

Answer:

for this one you would have to divide 19.9g by the kinetic energy 1.0 and you would get your answer.

Explanation:if you would give me brainiest that would help a lot :)

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:

Explanation:

₇N = 1s² 2s² 2p³

Therefore,

Option C is correct ✔

Answer:

A I did the exam and I saw A sorry if it is wrong dont have the best of memory

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:

is B

Explanation:

Answer:

Octahedral

Explanation:

The idea of hybridization is a valence bond concept introduced by Linus Pauling and soon became an important explanation for the structure of molecules even in coordination chemistry.

Hybridization involves the mixing of orbitals of appropriate energy to form a new set of orbitals that are more suitable for bonding with ligands.

When one s, two d and three p orbitals are hybridized in complex formation, octahedral complexes are formed.

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: 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:

First of all they are super tiny particles of neutrons, electrons and protons. Then they come together to organize a structure of atom. Atoms come together to form a molecule and smaller molecules work together to form macromolecules. Thus, how they organize and form building blocks of a substance.

Hope it helps!<3

600 and 1,300 degrees Celsius

In pretty sure

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: True

Explanation:

Answer:

87.5 %

Explanation:

Step 1: Given data

Step 2: Calculate the percent yield

When working with chemical reactions, we can determine the efficience in obtaining a product measuring the percent yield. The theoretical yield is the maximum amount of product that we could obtain according to the stoichiometry, whereas the real yield is the amount of product that we actually obtain when we carry out the process. We can calculate the percent yield usign the following expression.

%yield = real yield / theoretical yield × 100%

%yield = 105 kg / 120 kg × 100%

%yield = 87.5 %

Answer:

3. Sice increases, Ssw decreases, Ssys increases

Explanation:

Entropy basically refers to the degree of disorderliness of a system.

Ice Cube --> As the ice cube melts, it undergoes a change in state of matter from solid to liquid hence it's entropy increases as the degree of movement of its molecules is more disordered in the liquid state.

This means the likely options are; 1, 3 and 4.

Sidewalk --> The entropy here decreases as the ice melts on the side walk. This is because there is a reduction in temperature. Entropy is directly proportional to temperature. Decrease in temperature leads to decrease in entropy.

This means the likely option is 1 and 3

The net entropy change of the system is however positive.

Explanation:

I think it's the third one but I'm not sure

Answer:

The Answer for this is C

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:

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

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: [tex]HCO_2(aq)+OH^-(aq)\rightarrow ClO_2^-(aq)+H_2O(l)[/tex]

Explanation:

Neutralization is a chemical reaction in which an acid and a base reacts to form salt and water.

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The reaction of chlorous acid (weak acid) and sodium hydroxide (strong base) is written as:

[tex]HClO_2(aq)+NaOH(aq)\rightarrow NaClO_2(aq)+H_2O(l)[/tex]

The equation can be written in terms of ions as:

[tex]HClO_2(aq)+Na^+(aq)+OH^-(aq)\rightarrow Na^+(aq)+ClO_2^-(aq)+H_2O(l)[/tex]

The ions which are present on both the sides of the equation are sodium ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is :

[tex]HCO_2(aq)+OH^-(aq)\rightarrow ClO_2^-(aq)+H_2O(l)[/tex]

Answer:

p orbitals

Explanation:

Answer:

Molecular Formula Ca(OH)2 or CaH2O2

Synonyms CALCIUM HYDROXIDE 1305-62-0 Slaked lime Hydrated lime Ca(OH)2

Molecular Weight 74.09 g/mol

Component Compounds CID 962 (Water) CID 5460341 (Calcium)

Explanation:

Answer:

Explanation:

what are tho anwser choices

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:

Thermal

Explanation:

When something heats up its atoms become further apart making it melt when something heats up or gets heat or loses heat that's thermal energy

Answer:

Im pretty sure it would be true

Explanation: