I need help pretty bad can you answer all these questions

pH of solution = 9.661

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.

pOH=-log[OH⁻]

[tex]\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339[/tex]

pH+pOH=pKw

[tex]\tt pH=14-4.339\\\\pH=9.661[/tex]

Answer:

C.

Explanation:

Fluorine's atomic configuration is (2,7). As it's charge is -1, it will have 8 electrons in it's outermost shell thus filling its octate. similarly, Sodium loses one electron.

There you go :)

Answer:

Velocity Equation in these calculations:

Final velocity (v) of an object equals initial velocity (u) of that object plus acceleration (a) of the object times the elapsed time (t) from u to v.

Explanation:

Answer:

B) -4.1 units

Explanation:

According to this question, a state property X has a value 89.6 units. It undergoes the certain changes as follows:

- first increase by 3.6 units

- then increase by another 18.7 units

- then decrease by 12.2 units

- and finally attains a value of 85.5 units

This can be mathematically represented by 89.6 - {3.6 + 18.7 - 12.2 - x) = 85.5

To get x, we say;

89.6 + 3.6 = 93.2

93.2 + 18.7 = 111.9

111.9 - 12.2 = 99.7

99.7 - 85.5 = 14.2units.

The changes that occured is represented as follows:

= (3.6 + 18.7) - (12.2 + 14.2)

= 22.3 - 26.4

= -4.1 units

Answer:

B

Explanation:

Boron has 5 protons.

Answer:

"Low levels of the hormone epinephrine, also called adrenaline, cause blood vessels to relax and widen. High levels of this same hormone, along with the hormone norepinephrine, cause the blood vessels to narrow and the heart rate to rise, increasing blood pressure."

Explanation:

Answer:

Explanation:

3 N₂ (g)  + 2  O₃ (g)   →     6 NO (g)

Δ H(rxn ) = 90.37x 6 - ( 0 + 142.26 x 2 )

= 542.22  - 284.52

= 257.7 kJ

Δ S(rxn ) = 6 x 210.6 - ( 2 x 237.7 + 3 x 191.5 )

= 1263.6 - ( 475.4 + 574.5 )

= 213.7 J / K

Δ G = Δ H - T Δ S

= 257.7 - 350  x 213.7

= - 74537.3 kJ  .

Δ G / mole = - 74537.3 / 6 = - 12422.88 kJ / mol.

Answer:

We have nerves that are just like wires that run through our body that tells us what is going on and what to do about it. The hard dive like in a computer is our brain, which is made up of three parts that control things like coordination, movement, involuntary, and voluntary movement. The sensory numerous just like the keys in a computer pick up what we are doing in life.

Explanation:

Answer:

Definition

The Cretaceous/Tertiary boundary (KT), also often called the Cretaceous/Paleogene (K/Pg) boundary, marks the contact between the Mesozoic and Cenozoic eras ∼ 65 Ma ago. The KT boundary is characterized by the last major mass extinction in Earth history that saw the demise of the non-avian dinosaurs along with 50% to 60% of the Earth fauna and flora.

Answer:

1.65hr

Explanation:

Given parameters:

Number of labs  = 5 labs

 Time taken  = 3 minutes

Unknown:

Time taken in hours to grade 165 labs  = ?

Solution:

Let us find the rate of the teacher;

  Rate  = [tex]\frac{number of labs}{time}[/tex]  

  Insert the parameters and solve;

   Rate  = [tex]\frac{5}{3}[/tex]   = 1.67labs/min

Now;

   Time to grade 165 labs  = [tex]\frac{number of labs}{rate}[/tex]  

   Time to grade 165 labs  = [tex]\frac{165}{1.67}[/tex]   = 98.8min

  Since;

               60min = 1hr

               98.8min  = [tex]\frac{98.8}{60}[/tex]   = 1.65hr

Answer:

Your answer should be 2.4 x 10^9.  please hit the crown

Explanation:

Mass of Copper(I) chromate( CuCrO₄) = 19.75 g

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\tt \large{\boxed{\bold{mol=\dfrac{m(mass)}{MW(molecular~weight)}}}[/tex]

0.11 mole of Copper(I) chromate( CuCrO₄) ⇒ MW=179.54 g/mol, so mass :

[tex]\tt mass=mol\times MW\\\\mass=0.11\times 179.54\\\\mass=19.75~g[/tex]

Answer:

Fe + H2SO4  Fe2(SO4)3 + H2

Explanation:

its the answer on my answer key

Answer:

C- Fe + H2SO4  Fe2(SO4)3 + H2

Explanation:

The person above me is right. I also just took the test.

Answer:

a moving car

Explanation:

because The faster an object is moving, the more kinetic energy it has. Any object that is moving has kinetic energy – the moving object has energy because of its motion.

Answer:

plant

Explanation:

let me know if correct

Answer:

istopes is a situation in which each of two or more forms of same element that contain equal number of proton....while ions of an atoms are with extra electrons or missing electrons so they tends to differ

To quote the passage: "...a small hot object can have a

higher temperature but less thermal energy than a large cold object."

In other words, a small object can have a high average thermal energy, and therefore a high temperature, but since the object is smaller, the magnitude of thermal energy present in the object is by default less than that in the larger object.  As the passage indicates, every object has thermal energy.  So, despite the fact that the larger object is colder, it still has a greater thermal energy due to the number of molecules that comprise the larger object.

Based on the passage, an object with a lot of thermal energy might be cold but very large.

Answer:

The volume is 3.09 ft^3.

Explanation:

The formula for volume is mass divided by density. 10.0 g / 11.4 g/cm^3 = 0.87719. Converted to cubis foot is 3.09 ft^3. I hope this helps you.

Answer:

Bond broking

Explanation:

Bond broking.

Answer:

Ductility and Malleability

Explanation:

Pls mark my answer as brainliest

Answer:

the correct answer is Ductility and Malleability....(B)....

Explanation:

I took the test, hope this helps. also the person above me is correct

Answer:

a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits.

Explanation:

Answer:

07.

Explanation:

Answer:

7

Explanation:

We call these different isotopes of nitrogen. There are always 7 protons because the nucleus is always a nitrogen nucleus (Z=7). Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers.

Answer:  

1.A POWER DRILL COULD SET YOUR HOUSE ON FIRE, IN THEORY.

2.STICKY NOTES COME OFF EASILY BECAUSE THEIR ADHESIVE IS UNEVEN. ...

3.GUM IS CHEWY BECAUSE IT'S MADE OF RUBBER. ...

4.OFFICE BUILDINGS ARE EVER-SO-SLIGHTLY TALLER AT NIGHT. ...

5.A LEGO BRICK CAN SUPPORT 770 POUNDS OF FORCE. ...

6.POLISHING SHOES IS LIKE FILLING IN A ROAD'S POTHOLES.

Explanation:

Answer:

the amount of matter in the bowling ball remains the same

Explanation:

The reason why the mass of the bowling ball on earth and moon remains the same is that matter in the bowling ball remains the same.

Mass of any substance is the amount of matter it contains.

Answer:

formation process

Explanation:

farllon plate was fully subducted along pacific coast line

The cascade mountains formed from the igneous rocks by plate movement are younger and they are formed by the uplift of plates makes them appears aboveground in sierra Nevada.

Since they were formed by melting above a subduction zone, the Cascades and Sierra Nevada's rocks are largely igneous. The Cascades, which initially arose 36 million years ago and are still forming now, are younger mountains.

In contrast, the Nevadan Orogeny, which occurred over 200 million years ago, is when the plutonic core of the Sierra Nevada started to form. When subducting at a sharp angle, oceanic lithosphere at the edge of the North American continent melted, and the magma surged back through the continental crust to form a volcanic arc.

The once-deep granite batholith that makes up today's Sierra Nevada was exposed by erosion after being raised by the North American plate. Although one small spur is located in Nevada, the elevated granitic intrusion is 640 kilometers  long and largely located in California.

Find more on rocks in Sierra Nevada:

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Answer:

sentence 2, sentence 2, sentence 1

Explanation:

it was right for me on edge 2020

Answer:

1. Fred visited Nick after his graduation.

2. After Nick's graduation, Fred visited him.

1. Marie told Sarah that she makes great spaghetti.

2. Marie told Sarah, "You make great spaghetti."

1. John broke the fence with his bike.

2. John's bike hit a fence and it broke.

Answer:

c

Explanation:

I just learned all this in chemistry too lol

got 100 on the test last week so its good

Experiments with gold foil indicated that atoms contain a positively charged, dense center and the correct option is option C.

Experiments with gold foil, known as the Rutherford gold foil experiment, were conducted by Ernest Rutherford in 1911. In this experiment, he bombarded a thin gold foil with alpha particles.

Most of the alpha particles passed through the foil with little deflection, but some of them were deflected at large angles, and a small fraction even bounced back. This observation led Rutherford to conclude that the atom contains a positively charged, dense center called the nucleus, where most of its mass is concentrated. He proposed the nuclear model of the atom, which became a significant advancement in the understanding of atomic structure.

Thus, the ideal selection is option C.

Learn more about Gold foil experiment, here:

https://brainly.com/question/33537458

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Answer:120

Explanation:2gfdxxfgngfnf