Help please!!!!!!!!!!!!!!!!!!!!!!!!

Answer:

pH≈10.5

Explanation:

-log(3 x 10-11)≈10.5

Answer:

6663.6

Explanation:

Answer: The first question is chemical The second one is Physical

Explanation:

Answer:

i hope this helps :)

Explanation:

please mark brainlest

Answer:

dunno

Step-by-step explanations:

Answer:

The third choice

Explanation:

The law of conservation of mass tells us that the mass of the reactants and products in a chemical reaction will be equal to one another. Equations follow the law of conservation of mass when they are balanced, which means that they have the same number and type of atoms on each side.

When individual atoms are counted, the third choice has the same number and type of atoms on each side: 1 gallium, three cesium and three fluorine.

Due to the variations in the sun-earth distance.

Answer:

True

Explanation:

A titration can be defined as the experiment where the volume of known con concentration is mixed into another solution whose concentration is not known.

Most of the titration are acid-base titration. When performing titration the indicator which is used is usually phenolphthalein. The end point of the titration is the point where the indicator changes its color.

In case of acid base reaction, the end point is achieved when the phenolpthalein turns faint pink in color from transparent.

Hence, the given statement is correct, the indicator changes its color close to the end point of titration.

yes

Explanation:

Which suggests that in an earlier time whales and dogs could have evolved from the same organism. the common ancestor in the 2 animals share notible traits. the pakicets was one of the whales ancestors and the grey wolf was the dogs ancestor.

Answer:

A.

Explanation:

There are no vehicle emissions other than water vapor. This means no pertroleum products and no fossil fuels. :)

-Sienna Sushi

Answer:

uff mere dil ma ture kali chadiya ha uff tumi apne buni ha

Answer:

Cations (positively-charged ions) and anions (negatively-charged ions) are formed when a metal loses electrons, and a nonmetal gains those electrons. ... And all of them form an anion with a single negative charge.

B. Etherrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

Ether is the type of molecule. Hence, option B is correct.

Organic chemistry teaches us about the structure, properties, composition, reactions, and preparation of carbon-containing compounds.

Ether is an organic compound with an oxygen atom bonded to two alkyl or aryl groups. Ether's structure is same as alcohol.

Hence, option B is correct.

Learn more about organic chemistry here:

brainly.com/question/14623424

#SPJ5

Answer:1:1

Hope this helps!

Explanation:

Answer:

Gold(III) oxide (Au2O3) is an inorganic compound of gold and oxygen with the formula Au2O3. It is a red-brown solid that decomposes at 160 °C. (Au203 <---)

Answer:

-65.8C

Explanation:

The correct name of HNO₂, HI and of H₃PO₄ is nitrous acid, hydroiodic acid and phosphoric acid respectively.

Acids are those substances in which carboxylic acid (-COOH) is present and pH value of acids falls in the range of 0 to 6.9.

Name of the HNO₂ compound is nitrous acid, of HI is hydroiodic acid and of H₃PO₄ is phosphoric acid.

Hence name of the HNO₂, HI and of H₃PO₄ is nitrous acid, hydroiodic acid and phosphoric acid respectively.

To know more about acids, visit the below link:

https://brainly.com/question/24375075

#SPJ2

Answer: HNO2 nitrours acid

              HI Hydroiodic acid

               H3PO4 phosphoric acid

Explanation: edu

Answer:

%C= 42.1

%H=6.5

%O=51.4

Explanation:

Mass%=(mass/total)× 100%  

Answer:

The theoretical yield of urea = 120.35kg

The percent yield for the reaction = 72.70%

Explanation:

Lets calculate -

The given reaction is -

[tex]2NH_3(aq)+CO_2[/tex] →[tex]CH_4N_2O(aq)+H_2O (l)[/tex]

Molar mass of urea [tex]CH_4N_2O[/tex]= 60g/mole

Moles of [tex]NH_3[/tex] = [tex]\frac{62.8kg/mole}{17g/mole}[/tex] (since [tex]Moles=\frac{mass of substance}{mass of one mole}[/tex])

                     = 4011.76 moles

Moles of [tex]CO_2[/tex] = [tex]\frac{105kg}{44g/mole}[/tex]

                = [tex]\frac{105000g}{44g/mole}[/tex]

                = 2386.36 moles

Theoritically , moles of [tex]NH_3[/tex] required = double the moles of [tex]CO_2[/tex]

    but , [tex]4011.76<2\times 2386.36[/tex] , the limiting reagent is [tex]NH_3[/tex]

Theoritical moles of urea obtained = [tex]\frac{1 mole CH_4N_2O}{2mole NH_3}\times4011.76 mole NH_3[/tex]

                                                      = [tex]2005.88mole CH_4N_2O[/tex]

Mass of 2005.88 mole of [tex]CH_4N_2O[/tex] =[tex]2005.88 mole \times\frac{60g CH_4N_2O}{1mole CH_4N_2O}[/tex]

                                                     = 120352.8g

                                                     [tex]120352.8g\times \frac{1kg}{1000g}[/tex]

                                                     = 120.35kg

Therefore , theroritical yeild of urea = 120.35kg

Now , Percent yeild = [tex]\frac{87.5kg}{120.35kg}\times100[/tex]

                                 72.70%

Thus , the percent yeild for the reaction is 72.70%

Answer:

True

Explanation:

it is a Predation

Answer:

they have the same structures in common

Answer:

A, D, F

Explanation:

Cold currents usually go along with Earth's rotation while the warm waters are subjected to the coriolis effect and go in a direction against Earth's rotation.

Answer: we'll for sunny days that we'll be high pressure and for low pressure that we'll be cloudy and foggy moist days .

Explanation:

Protein shake -------------> Ribosome

Paper bag -------------> Vacuole

Packing candles -------------> Golgi Apparatus

im not 100% sure if paper bag and packing candles is correct.

Answer:

pH = 10.15

Explanation:

NaOH is a strong base so it dissolves completely.

Calculate your [OH-] first by dividing the moles of OH- by the volume.

0.0015 mol OH- / 11 L = 0.00014

Then, calculate the pOH:

pOH = -log[OH-] = -log(0.00014) = 3.85

pOH + pH = 14, so pH = 14 - pOH = 14 - 3.85 = 10.15