Can someone pls answer this question

Answer:

Al₂O₃ + 2 NaOH + 3 H₂O = 2 NaAl(OH)₄

Answer:

The average kinetic energy has increased. More molecules have a higher energy level.

Explanation:

I so esay

Answer:

B. Trees can be replenished

Explanation:

Trees are renewable and replenishable resources. Trees can be planted, grown up, and harvested for timber.

Answer:

As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.

Answer:

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# ꧁❣ RainbowSalt2²2² ࿐

Answer:

6

Explanation:

As , 2H2 + O2 = 2H2O

with 6 H2, 4O2 is excess.

H2O molecules formed = 6

Answer:

The equilbrium constant is 179.6

Explanation:

To solve this question we can use the equation:

ΔG = -RTlnK

Where ΔG is Gibbs free energy = 12.86kJ/mol

R is gas constant = 8.314x10⁻³kJ/molK

T is absolute temperature = 298K

And K is equilibrium constant.

Replacing:

12.86kJ/mol = -8.314x10⁻³kJ/molK*298K lnK

5.19 = lnK

e^5.19 = K

179.6 = K

The system which helps in get rid of some kind of waste are excretory system, digestive system and respiratory system.

Waste materials are the substances which we will get after the absorption of all nutients and usefull things.

Hence all above given systems helps to get rid of some kind of waste.

To know more about excretory system, visit the below link:

https://brainly.com/question/16665730

#SPJ2

Answer:

English Language Learners Definition of number. (Entry 1 of 2) : a word or symbol (such as "five" or "16") that represents a specific amount or quantity. : a number or a set of numbers and other symbols that is used to identify a person or thing.

Explanation:

79 is the number of protons gold has.

Hope this helps; have a great day!

Answer:

B

Explanation:

Answer:

Autotrophs store chemical energy in carbohydrate food molecules they build themselves. Most autotrophs make their food through photosynthesis using the energy of the sun. Heterotrophs cannot make their own food, so they must eat or absorb it.

Answer:

Two elements of oxygen are presented.

Answer:

The initial pressure was 852.27 torr.

Explanation:

Given that,

Initial temperature, T = 315 K

Final temperature, T' = 231 K

Final pressure, P' = 625 torr

We need to find the initial pressure of the gas. We know that, the relation between pressure and temperature is given by :

[tex]\dfrac{P}{P'}=\dfrac{T}{T'}\\\\P=\dfrac{P'T}{T'}\\\\P=\dfrac{625\times 315}{231}\\\\P=852.27\ torr[/tex]

So, the initial pressure was 852.27 torr.

Answer:

heat capacity. (another term used for specific heat)The amount of heat required to raise the temperature of a specified amount of a substance by 1°C or 1 K.

Explanation:

Specific heat is a common name for:

Specific heat is the term that is used to describe the amount of heat which would be sufficient to change the temperature of a unit mass by one degree.

As a result of this, we can see that if the specific heat that is needed to change the temperature of water is found, then it can be easily determined if the water has reached its boiling point.

Therefore, another name for specific heat is also massic heat capacit

Please note that your answer is incomplete and as a result of this, i would be giving you a general overview which should help you get the correct answer.

Read more here:

https://brainly.com/question/17188200

Answer:

option first is right answer

Answer:

[tex]HCl conc=2.2M[/tex]

Explanation:

From the question we are told that:

Mass of zinc [tex]Mass_{z_n}=2.5g[/tex]

Initial conc of HCl [tex]HConc_1=6.0M[/tex]

Initial volume of HCl [tex]Hvol_1=20.0mL[/tex]

Molar mass of zinc [tex]M_{Z_n}=65.38g/mol[/tex]

Generally the equation for reaction  is mathematically given by

[tex]2HCL+Zn\implies ZnCl_2 +H_2[/tex]

Generally the equation for moles of zinc [tex]m_{z_n}[/tex] is mathematically given by

[tex]m_{z_n}=\frac{Mass_{Z_n}}{M_{Z_n}}[/tex]

[tex]m_{z_n}=\frac{2.5g}{M_{65.38}}[/tex]

[tex]m_{z_n}=0.038molZn[/tex]

Generally the equation for moles of [tex]m_{HCl}[/tex] is mathematically given by

[tex]m_{HCl}=HConc_1*Hvol_1[/tex]

[tex]m_{HCl}=6.0M*20.0mL[/tex]

[tex]m_{HCl}=6.0M*20.0*10^{-3}L[/tex]

[tex]m_{HCl}=0.12\ mol\ HCl[/tex]

Generally the reacted moles of HCl [tex]HCl_[reacted][/tex] is mathematically given by

Since

Zn:HCl =1:2

Therefore

[tex]HCl_[reacted]=0.038*\frac{2}{1}[/tex]

[tex]HCl_[reacted]=0.076mol \ HCl[/tex]

Generally the moles of HCl after Zn oxidization X is mathematically given by

[tex]x=0.12-0.076[/tex]

[tex]x=0.044 mol HCl[/tex]

Generally the conc of hydrochloride acid X is mathematically given by

[tex]X=\frac{0.044}{0.020}[/tex]

[tex]X=2.2 M Hcl[/tex]

Therefore Conc of HCl

[tex]HCl conc=2.2M[/tex]

Answer:

At 10 ∘C , the solubility of potassium chloride is measured to be 31.2⋅g per 100⋅g of water.

Explanation:

Answer:

A & B

Explanation:

This is because insulators just keep the house warm, while rheostats just control the current in the house. The circuit breakers and fuses, can stop something like a fire faster than the other two just by turning them off. Making them safety features in a house! Hope this helps! Plz mark as brainliest!

Answer:

circuit breakers and fuses

Explanation:

Circuit breakers and fuses are very similar as they are both designed to protect a circuit from an overload or short-circuit

Answer

0.32 is that answer

Explanation:

you just use the calculator

Answer:

Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures.

Explanation:

Answer:

Explanation:

The number of molecules can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 3 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer: OB. 1.806 x 1024

Explanation:

Answer:

Answer. Explanation: Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.

Answer:

27.86x10^-3 Kg

Explanation:

Hi! To get the result you only need to use this formula: m = n x M <=> m = 1.070 x ((2x12.01 + 2x1.01) x 10^-3) = 27.8628 x 10^-3 Kg. Hope it helped!

Answer:

Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.

Explanation:

Answer:

Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process. If you are considering the colour change only - refer to it as bleaching. If you are considering the reaction mechanism and how the chemicals which provide the colour are changed, then refer to it as oxidation.

Explanation: