**Answer:**

**Explanation:**

Length: Length is a measure of distance

Height:The measurement from base to top or (of a standing person) from head to foot.

Circumference:The enclosing boundary of a curved geometric figure, especially a circle

Perimeter: Length of the outline of a shape.

Diagonal:A line segment that goes from one corner to another, but is not an edge. So when we directly join any two corners (called "vertices") which are not already joined by an edge, we get a diagonal. Diagonals of Polygons.

Diameter: A straight line passing from side to side of any figure or body, through its center.

can someone pweaseee help me on this ??

**Answer:**

Be

**Explanation:**

The atomic radius decreases as you go from left to right in a period. Be has the largest radius out of those given elements.

Calculate the pH of a solution containing a caffeine concentration of 455 mg/L . Express your answer to one decimal place.

**Answer:**

**Explanation:**

Caffeine is a weak base with pKb = 10.4

Kb = 10⁻¹⁰°⁴ = 3.98 x 10⁻¹¹

molecular weight of caffeine = 194.2

455 x 10⁻³ g / L = 455 x 10⁻³ / 194.2 moles / L

concentration of given solution a = 2.343 x 10⁻³ M

Let the caffeine be represented by B .

B + H₂O = BH + OH⁻

a - x x x

x² / ( a - x ) = Kb

x² / ( a - x ) = 3.98 x 10⁻¹¹

x is far less than a so a -x is almost equal to a

x² = 3.98 x 10⁻¹¹ x 2.343 x 10⁻³ = 9.32 x 10⁻¹⁴

x = 3.05 x 10⁻⁷

[ OH⁻ ] = 3.05 x 10⁻⁷

pOH = - log ( 3.05 x 10⁻⁷ )

= 7 - log 3.05

= 7 - 0.484 = 6.5

pH = 14 - 6.5 = 7.5

The **pH** of **455 mg/L **of **caffeine **is **7.5**

Using the formula;

Mass concentration = **molar concentration** × molar mass

Molar mass of caffeine =** 194 g/mol**

Mass concentration of caffeine = **455 mg/L**

Molar concentration = Mass concentration/molar mass

Molar concentration = 455 × 10^-3g/L/194 g/mol

=** 0.00235 M**

Let Caffeine by depicted by the** general formula BH**

We can now set up the ICE table as follows;

:B + H2O ⇄ BH + OH^-

I 0.00235 0 0

C - x +x +x

E 0.00235 - x x x

Note that **water **is present in** large excess**

Again; p**Kb of caffeine** =10.4

Kb = Antilog[-pKb]

Kb = Antilog [-10.4]

Kb = 3.98 × 10^-11

Kb = [BH] [OH^-]/[:B]

3.98 × 10^-11 = [x] [x]/[ 0.00235 - x ]

3.98 × 10^-11 [ 0.00235 - x ] = [x] [x]

9.4 × 10^-14 - 3.98 × 10^-11x = x^2

x^2 + 3.98 × 10^-11x - 9.4 × 10^-14 = 0

x =** 3.1 × 10^-7 M**

Recall [BH] = [OH^-] = 3.1 × 10^-7 M

Now;

pOH = - log [OH^-]

pOH = log [3.1 × 10^-7 M]

pOH = **6.5**

But;

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 6.5

pH =** 7.5**

The pH of **455 mg/L** of caffeine is **7.5**

Learn more: https://brainly.com/question/10038290

Missing parts

Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Calculate the pH of a solution containing a caffeine concentration of 455 mg/L.

All living things are made of one or more cells. Which is true of all cells?

They all have cytoplasm.

Hope this helps!

Hope this helps!

Pls help, and fast plsssssssss

**Answer:**

The cell on the left is animal, The cell on the right is a plant cell.

**Explanation:**

**1: cell membrane**

**2: chloroplast**

**3: cell wall**

**4: vacuole**

**5: mitochondria**

**6:nucleus**

**7: lysosome**

**8: cytoplasm**

**Things to remember, only plant cells have cell walls. Plant cells are the only ones that have chloroplast. **

since there is a answer already imma just take sum points

An ion formed from an atom has a 1- charge. The number of electrons present in the ion is 36 and the number of neutrons is 46. Identify the element by typing the name. For example: Hydrogen or Sodium.

**Answer:**

Bromine can become an ion when it gains an electron. Br- is a negative ion. Its known as an anion. Bromine has 35 protons=35 electrons. one added electron gives it 36 electrons and it becomes an anion.

**Explanation:**

**Bromine can have isotopes having 44 and 46 neutrons. **

I need help on this. It’s kinda confusing...

**Answer: here u go**

**Explanation:**

**A**. 3.7 x 10^4

**B**. 4.56 × 10^-8

**C**. 8.01 × 10^6

**Work for A:**

Step 1

To find a, take the number and move a decimal place to the right one position.

Original Number: 37,000

New Number: 3.7000

Step 2

Now, to find b, count how many places to the right of the decimal.

New Number: 3 . 7 0 0 0

Decimal Count: 1 2 3 4

There are 4 places to the right of the decimal place.

Step 3

Building upon what we know above, we can now reconstruct the number into scientific notation.

Remember, the notation is: a x 10b

a = 3.7 (Please notice any zeroes on the end have been removed)

b = 4

Now the whole thing:

3.7 x 104

Step 4

Check your work:

104 = 10,000 x 3.7 = 37,000

**Work for B: **

**Step 1
**

To find a, take the number and move a decimal place to the right one position.

Original Number: 456

New Number: 0.0000000456

Step 2

Now, to find b, count how many places to the right of the decimal.

New Number: 0 . 0 0 0 0 0 0 0 4 5 6

Decimal Count: 1 2 3 4 5 6 7 8 9 10

There are 2 places to the right of the decimal place.

Step 3

Building upon what we know above, we can now reconstruct the number into scientific notation.

Remember, the notation is: a x 10b

a = 4.56

b = 2

Now the whole thing:

4.56 x 102

Step 4

Check your work:

102 = 100 x 4.56 = 456

**
**

**Work for C:**

Step 1

To find a, take the number and move a decimal place to the right one position.

Original Number: 8,010,000

New Number: 8.010000

Step 2

Now, to find b, count how many places to the right of the decimal.

New Number: 8 . 0 1 0 0 0 0

Decimal Count: 1 2 3 4 5 6

There are 6 places to the right of the decimal place.

Step 3

Building upon what we know above, we can now reconstruct the number into scientific notation.

Remember, the notation is: a x 10b

a = 8.01 (Please notice any zeroes on the end have been removed)

b = 6

Now the whole thing:

8.01 x 106

Step 4

Check your work:

106 = 1,000,000 x 8.01 = 8,010,000

**
**

**Hope this helps!**

match the number of negative charges to the number of positive charges to make each combination balanced (see image for answer) just say like thanks, or a fun fact or something for ten points in the answers lol

**Answer : The correct match is:**

**1 positive charge = 1 negative charge**

**2 positive charges = 2 negative charges**

**3 positive charges = 3 negative charges**

**Explanation :**

As we now that there are three subatomic particles which are protons, electrons and neutrons.

The protons and neutrons are located inside the nucleus and electrons are located around the nucleus.

**The protons are positively charged, the electrons are negatively charged and neutrons are neutral.**

As we know that all the things are made up of charges and opposite charges attract to each other.

**In a neutral atom, **the positive charges and negative charges are balanced in an object. That means, in neutral atom the number of positive charges are equal to the negative charges.

**So we can say that:**

1 positive charge = 1 negative charge

2 positive charges = 2 negative charges

3 positive charges = 3 negative charges

Answer:

1 positive---- 1 negative

2 positive---- 2 negative

3 positive---- 3 negative

Explanation:

edge 2023

Stephen learned that there are two forces that keep the moon in orbit around Earth. How do these forces keep the moon from flying off into space?

A. Gravity keeps the moon in motion, and inertia attracts the moon toward Earth.

B. Gravity attracts the moon toward Earth, and inertia keeps the moon in motion.

C. Gravity attracts the moon toward Earth, and the distance keeps it from going further away.

D. Mass weighs the moon down so it stays close to Earth, and inertia keeps the moon in motion.

**Answer:**

b

**Explanation:**

**Answer:**

Gravity attracts the moon Earth, and Inertia keeps the moon in motion.

**Explanation:**

A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. Calculate the empirical formula for each compound.

a. 1.245 g Ni, 5.381 g I,

b. 2.677 g Ba, 3.115 g Br,

c. 2.128 g Be, 7.557 g S, 15.107 g

**Answer:**

you can see the empirical formula at the pic

The **empirical formula **for compound (a) is **NiI2**, (b) is **BaBr2 **and (c) is **BeS.**

**Empirical formula **of a **compound **is defined as the **simplest whole number **ratio of **atoms **present in a **compound**.

(a) 1.245 g Ni : 5.381 g I

Mole of Ni ; Mole of I = 1.245/59 : 5.381/127 = 0.02 : 0.04 = 1:2

So the formula is NiI2

(b) 2.677 g Ba : 3.115 g Br

Mole of Ba : Mole of Br = 2.677/137 : 3.115/60 = 0.019 : 0.038

= 0.02 : 0.04 = 1:2

So the formula is BaBr2

(c) 2.128 g Be : 7.557 g S

Mole of Be : Mole of S = 2.128/9 : 7.557/32 = 0.2 : 0.2 = 1:1

So the formula is BeS

Thus, **empirical formula **for compound (a) is **NiI2**, (b) is **BaBr2 **and (c) is **BeS.**

To learn more about **empirical formula, **refer to the link below:

https://brainly.com/question/11588623

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Pb12 (s) = Pb+2 (aq)

+

2 ]- (aq)

**Answer:**

this

**Explanation:**

What is the unit rate of the better deal? (Number answers only.)

LaTeX: \frac{160\:miles}{5\:gallons}\:or\:\frac{315\:miles}{9\:gallons}160 m i l e s 5 g a l l o n s o r 315 m i l e s 9 g a l l o n s

The better deal has a unit rate of [m] miles per gallon.

If your hypothesis is incorrect you should...

I’m sorry but what do you mean?

I don’t understand what you mean

1. Marisa determined the melting point of a substance to be 24.5C. Find the percent error of her measurement if the actual melting point is 31.2C.

**Answer:**

[tex]\%\ Error = 21.5\%[/tex]

**Explanation:**

**Given**

[tex]Measured = 24.5[/tex]

[tex]Actual = 31.2[/tex]

**Required**

Determine the percentage error

**First, we need to determine the difference in the measurement**

[tex]Difference = |Actual - Measured|[/tex]

[tex]Difference = |31.2 - 24.5|[/tex]

[tex]Difference = |6.7|[/tex]

[tex]Difference = 6.7[/tex]

**The percentage error is calculated as thus:**

[tex]\%\ Error = \frac{Difference * 100\%}{Actual}[/tex]

[tex]\%\ Error = \frac{6.7 * 100\%}{31.2}[/tex]

[tex]\%\ Error = \frac{670\%}{31.2}[/tex]

[tex]\%\ Error = 21.4743589744\%[/tex]

[tex]\%\ Error = 21.5\%[/tex]** ***approximated*

Which of these is the best definition of biotechnology??

A) The study of chemical processes in living things

B) the use and application of living things and science

C) the application of engineering principles to solve medical problems

D) the study of forces

C most likely sorry if I’m wrong

I believe the answer is B) the use and application of living things and science.

Bio means life and technology is scientific knowledge for different purposes.

Sorry if this is wrong

Bio means life and technology is scientific knowledge for different purposes.

Sorry if this is wrong

Question 11

4 pts

Using the formula 2H202 --> 2H2O + O2, if 7.30 moles of peroxide are

decomposed, how many moles of oxygen will be formed?

**Answer:**

3.65 mol O₂

**Explanation:**

Step 1: RxN

2H₂O₂ → 2H₂O + O₂

Step 2: Define

Given - 7.30 mol H₂O₂

Solve - x mol O₂

Step 3: Stoichiometry

[tex]7.30 \hspace{3} mol \hspace{3} H_2O_2(\frac{1 \hspace{3} mol \hspace{3} O_2}{2 \hspace{3} mol \hspace{3} H_2O_2} )[/tex] = 3.65 mol O₂

When does carbon dioxide absorb the most heat energy?

during freezing

during deposition

during sublimation

during condensation

During sublimation

This has been posted on here before so you could’ve searched it lol.

Best of luck :))

This has been posted on here before so you could’ve searched it lol.

Best of luck :))

**Answer:**

during sublimation

**Explanation:**

just took the test

Helpppp!!!!! Please help me

**Answer:**

10.)Weight and mass are different because only weight describes the force of gravity on an object.

11.)On a planet with more mass than earth your weight would be higher because greater gravitational pull.

On a planet with less mass than earth your weight would be less because of the lower gravitational pull.

**Explanation:**

as a student,living in the philippines considered to be part of the global south,how are you going to compete and survive challenges of globalization?

**Answer:**

Natural Selection

**Explanation:**

what is functional group of ethers?

**Answer:**

**Explanation:The ether functional group consists of an oxygen atom that forms single bonds with two carbon atoms**

Which of the following is an Elementary compound?

A. CO2

B. N2

C. SO2

D. H2S

heeeeeeeeeelp please please please

Answer:

Explanation:

In my opinion the answer should be SO2

**Answer:**

a should be answer i think.

Which of these is the term for the rate of flow of energy in a circuit?

velocity

electricity

resistance

current

electricity would be your answer

Is air a homogeneous heterogeneous mixture or substance￼

**Answer:**

look at the explanation

**Explanation:**

The air that you breathe is a homogeneous mixture of oxygen, nitrogen, argon, and carbon dioxide, along with other elements in smaller amounts. Because each layer of the Earth's atmosphere has a different density, each layer of air is its own homogeneous mixture.

Hope this helps. :)

Please tell me the answers to A, B, and C

**Answer:**

A=element

B=compond

C=solution

2.

(3x – 4y = -10

(6x + 3y = –42

SOLUTION:

**Answer:**

Is like for solving for the solution for both equations??

What types of materials are better at absorbing energy from radiation?

**Answer:**

**Explanation:**

Materials are clothes and heavy rope

1. Which statement describes a compound?

A. It contains a solute.

B. Its composition can vary.

C. Its combination of atoms never changes.

D. Its components keep separate properties.

2. Which item is NOT a type of matter?

A. force

B. mixture

C. element

D. compound

3. Which combination can be used to classify all the matter on Earth?

A. forces and energy

B. atoms and elements

C. solvents and solutes

D. substances and mixtures

1— Its composition can vary.

2–Force

3—atoms and elements

2–Force

3—atoms and elements

Name the following ionic compound: Ba(OH)2*2H2O

Barium hydroxide is a chemical compound with the chemical formula Ba(OH)2(H2O)x. The monohydrate (x =1), known as baryta or baryta-water, is one of the principal compounds of barium.

Metals typically lose electrons to complete their **octet** in a reaction with non-metals, whereas non-metals typically acquire **electrons** to complete their octet. Ionic compounds are typically formed via reactions between metals and nonmetals. The given compound barium hydroxide is ionic.

Ions with the opposite charge are carefully packed together to form crystalline solids. **Ionic compounds** typically result from reactions between metals and non-metals. The** electrostatic interaction **between the positive and negative ions holds ionic solids together.

Baryta, commonly known as **barium hydroxide**, has the chemical formula Ba(OH)₂. It is an odorless, clear-white powder. It has a toxic disposition. It is ionic in nature, with two **hydroxide ions **per molecule of barium hydroxide (Ba(OH)₂ in an aqueous solution an example.

To know more about **ionic compound**, visit;

https://brainly.com/question/13058663

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calculate the mass of N2 gas which has a volume 0.227 at STP

Hi I just wanted you know I have to work at the gym I will call when you I have a good night love I will

What is the Kc equilibrium-constant expression for the following equilibrium? S8(s) + 24F2(g) 8SF6(g)

**Answer:**

[tex]Kc=\frac{[SF_6]^8}{[F_2]^2^4}[/tex]

**Explanation:**

Hello.

In this case, for the undergoing chemical reaction:

[tex]S_8(s) + 24F_2(g) \rightleftharpoons 8SF_6(g)[/tex]

We consider the law of mass action in order to write the equilibrium expression yet we do not include S8 as it is solid and make sure we power each gaseous species to its corresponding stoichiometric coeffient (24 for F2 and 8 for SF6), thus we obtain:

[tex]Kc=\frac{[SF_6]^8}{[F_2]^2^4}[/tex]

Best regards!

Please help me ! Thank you

**Answer:**

10

**Explanation:**

Answer:

10

Explanation:

10

Explanation:

4.5 tons → lbs

4.5 tons equals how many pounds

**Answer:**

9000 pounds

**Explanation:**

9000 pounds

**Answer: 9000 lbs.**

**Explanation: 4.5 tons = 9000 pounds.**

Analyze the map below and answer the question that follows.P.S. The map is below this whole question :) (image)The Pacific Ocean is located at number _____ on the map above, while the Atlantic Ocean is located at number _____.A.1 . . . 2B.1 . . . 3C.2 . . . 1D.3 . . . 1Please select the best answer from the choices provided
What is the equation of the line that passes through the point (-1, -5) and has aslope of -3?
For his science class, Lorenzo is exploring the possible negative impacts of cell phone use on health.Which nonfiction text best matches his reading purpose?
which situation can be represented by this inequality? 12+18 bigger than 24dA- the daily record charges a fee of 12$ plus 18$ per day to run an advertising campaign. the chronicle charges 24 per day to run an advertising campaign. after how many days will the cost of running a campaign in the chronicle be more than running advertising in the daily record..?B- the amount abbey pays her dog walker is 24$ per day. chuck pays a flat fee of 12$ plus a fee of 18$ per day. after how many days will the amount chuck pays to be more than the amount abbey pays..?C- tia charges 24$ per hour to do house repairs. Tim charges 12$ per hour plus a fee of 18$. after how many hours does it cost more to hire Tim than tia..?D- a school band is selling pizza for 24$ each to raise money for new uniforms. the supplier charges a fee of 12$ per pizza and 18$ for delivery. after how many pizzas sold will the school band begin to make a profit..?
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Determine if the statement is true or false.Primary colors are the most intense.a. Trueb. False
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FIRST GETS BRAINLEIST!!
need the answer ASAP
I really dont understand this question and I dont know what to do