D cuz it says the answer

A triangle has one angle that measures 81° and one that measures 37° what is the measure of a third angle￼

A triangle has 180 degrees. So to find the third angle, add the first and second angle. 81+37=118 degrees

Now take 180 and subtract 118

180-118=62

The third angle is 62 degrees

Now take 180 and subtract 118

180-118=62

The third angle is 62 degrees

Given 1.67 moles of K, how many moles of KBr are produced?

2 K+ 1 Br2---> 2 KBr

[tex]\displaystyle 1.67 \ mol \ KBr[/tex]

**Math**

Pre-Algebra

Order of Operations: **BPEMDAS**

**Chemistry**

Atomic Structure

MolesStoichiometry

Using Dimensional AnalysisAnalyzing Reactions RxNStep 1: Define

[RxN - Balanced] 2K + Br₂ → 2KBr

[Given] 1.67 moles K

[Solve] moles KBr

Step 2: Identify Conversions

[RxN] 2 mol K → 2 mol KBr

Step 3: Stoichiometry

[DA] Set up conversion: [tex]\displaystyle 1.67 \ mol \ K(\frac{2 \ mol \ KBr}{2 \ mol \ K})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1.67 \ mol \ KBr[/tex]? I JUST DONT UNDERSTAND

**Answer:**

5SiO2 + 2CaC2 → 5Si + 2CaO + 4CO2

**Explanation:**

When you are balancing an equation, you use coefficients to change the number of atoms of each type that are on each side of the equation.

You cannot change subscripts, the small numbers to the right of the substances. You can only add coefficients, the large numbers to the left of substances.

A balanced equation has the same number and type of atoms on both sides of the equation (the reactants on the left, the products on the right).

To begin, this equation has:

1 Si

2 O

1 Ca

2 C

on the left and

1 Si

1 Ca

3 O

1 C

on the right. Those numbers don't match!

By adding coefficients we end up with 5 Si, 10 O, 2 Ca and 4 C on both sides.

Compare the change in pH with the addition of acid and base to deionized water and to a buffer.

**Answer:**

case1.

The addition of acid and base leads to a change in pH of the water when adding to deionized water due to fact that acid and bases dissociated in dissolving in water. If the H+ ion increases in the water as acid addition hikes it, it will result in decreasing the pH value. The intensity of the acid also affects the dissociation of the ions.

case2

Buffers are normally formed by weak acid and its conjugate base, and adding acid to the buffer it absorbs the H+ ions so the pH will be lower and adding base or increase of OH- conjugate base resists the pH value to increase.

How many moles are in 2.5L of 1.75 M Na2CO3

**Answer: There are 4.375 moles in 2.5 L of 1.75 M **[tex]Na_2CO_3[/tex]

**Explanation:**

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}[/tex]

Molarity of solution = 1.75 M

Volume of solution = 2.5 L

Putting values in equation , we get:

[tex]1.75M=\frac{\text{Moles of} Na_2CO_3}{2.5L}\\\\\text{Moles of }Na_2CO_3=1.75mol/L\times 2.5L=4.375mol[/tex]

Draw the structure formula for

1-ethyl-2,3-dimethylbenzene

Please help me

**Answer:**

Please see the attached picture.

**Explanation:**

1) Draw a benzene ring

2) On the first carbon, add a CH₂CH₃ (known as ethyl) since its location number is 1.

3) 'Dimethyl' refers to 2 methyl (CH₃) branches. The location numbers are 2 and 3, thus add a CH₃ on the 2nd and 3rd carbons.

A vitamin C (ascorbic acid) tablet was dissolved in approximately 50 mL of distilled water and titrated with the standardized NaOH solution. From the results of this titration, the mg of ascorbic acid in the tablet was calculated. Molecular formula of ascorbic acid: C6H8O6 Volume of NaOH required to neutralize ascorbic acid in Vitamin C tablet (mL) 20.74 Concentration of NaOH in mol/L, 0.201 Calculate the amount of ascorbic acid in the Vitamin C tablet in (mg).

**Answer:**

**The correct answer is - **733.69** mg.**

**Explanation:**

**given:**

**The volume of ascorbic acid = 50 ml**

**The volume of NaOH = 20.74 ml**

**Molarity of NaOH = 0.201 M**

**formula = C6H8O6**

**Solution:**

moles of NaOH for titration = molarity of NaOH × The volume of NaOH

**= 0.201 **× **20.74 **× 10^-3

=4.16874 × 10^-3

then molecular weight of ascorbic acid

= 6 × 12+ 8×1+ 6× 16

=176g/mol

the molecular mass would be

= 4.16874 × 10^-3 × 176

= 733.69 × 10^-3 g

=733.69 mg

What volume of 1.75 M hydrochloric acid (HCl aq) must be diluted with water to prepare 0.500 L of 0.250 M hydrochloric acid?

**Answer:**

[tex]V_1=0.0714L[/tex]

**Explanation:**

Hello there!

In this case, since we need to dilute the 1.75-M HCl, and the total number of moles remain unchanged, we can write:

[tex]n_1=n_2[/tex]

And in terms of volume and concentration:

[tex]C_1V_1=C_2V_2[/tex]

Thus, we can solve for the volume of the concentrated HCl as shown below:

[tex]V_1=\frac{C_2V_2}{C_1}[/tex]

Therefore, we plug in the data to get:

[tex]V_1=\frac{0.250M*0.500L}{1.75 M}\\\\V_1=0.0714L[/tex]

Best regards!

What is the final volume?

Answer:

Option A. 9.4 L

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 8 L

Initial temperature (T₁) = 293 K

Final temperature (T₂) = 343 K

Final volume (V₂) =?

V₁ / T₁ = V₂ / T₂

8 / 293 = V₂ / 343

Cross multiply

293 × V₂ = 8 × 343

293 × V₂ = 2744

Divide both side by 293

V₂ = 2744 / 293

V₂ = 9.4 L

Therefore, the final volume of the gas is 9.4 L

hi, if your looking for extra points (50+) and br ainiest here is ur chance, answer this question correctly plz

C! the others don’t make sense

Calculate the mass, in grams, of 0.540 mol of manganese (Mn).

Report your answer with three significant figures.

**Answer:**

m = 29.6 grams

**Explanation:**

Given that,

Number of moles = 0.540

The molar mass of manganese = 54.93 g/mol

We know that,

**Number of moles = given mass/molar mass**

[tex]m=n\times M\\\\m=0.540 \times 54.93\\\\m=29.6\ g[/tex]

**So, the required mass of the Manganese is equal to 29.6 grams.**

What BEST describes the relation of a new population to an increase in the amount of space it occupies? a - The population will die out

b - The population will remain constant

c - The population will grow exponentially

answer c is correct

Does the magnetic field lines of repelling magnets always combine. True or False?

Its true they are always combine

**Answer:**

*T**r**u**e*

**Explanation:**

*y**e**s** **m**a**g**n**e**t**i**c** **f**e**i**l**d** **l**i**n**e**s** **i**s** **a**l**w**a**y**s** **c**o**m**b**i**n**e**d*

How many atoms are in 90.43 moles of copper

409 g P2O5 2) 5.44 x 1025 atoms Cu

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore,** 8.12×10²³ atoms** are in **90.43 mole **of copper.

The SI unit of amount of substance in chemistry is **mole**. The mole is used to measure the quantity of amount of substance. It measure the number of elementary **entities **of a given substance that are present in a given sample. There are so many formula for calculating mole.

we know one mole of any element contains **6.022×10²³ atoms **which is also called Avogadro number

**number of atoms/molecules=number of moles × 6.022×10²³**(Avogadro number)

number of moles of copper=90.43 moles

Substituting all the given values in the above equation, we get

number of atoms/molecules= 90.43 × 6.022×10²³

**number of atoms/molecules=8.12×10²³ molecules**

Therefore, **8.12×10²³ atoms** are in ** 90.43 mole **of copper.

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One of the following is not a physical property of iron.

Mark only one oval.

malleability

magnetism

rusting

color

**Answer:**

Rusting

**Explanation:**

Rusting is oxidizing iron, which would be a chemical property.

help plz and will give brainly

I think D or C is my top answers

Do you think humans are responsible for global warming trends? Why or why not?

**Answer:**

Yes. At least some. There has been ups and downs in temperature ever since the Earth was created, and this is just another up in temperature. I do think that humans have made it worse though, with all of the greenhouse gases and things like that.

hi!! can somebody help me with this question?

which is the best example of commensalism?

A. honey bees feed on the pollen of cornflowers and help the flowers reproduce

B. barnacles ride on a gray whales back to obtain food, and the whale is not harmed

C. squirrels and chipmunks eat the same nuts in a forest where food is scarce

D. prairie dogs often collect and eat food in groups so they are better protected from enemies

thx to anybody that helps! ♡︎

**Answer:**

B: Barnacles ride on a gray whale's back to obtain food, and the hale is not harmed.

**Explanation:**

**I got it right on Edge.**

Balance Ca + HCI +CaCl2 + H2

**Answer:**

Ca + 2 HCl -- CaCl2 + H2

**Explanation:**

There are two hydrogen on the right side, so we multiply the left side( HCl) by 2 to get 2 hydrogen on the left. This automatically gives you 2 Cl on left side and there are already 2 cl on the right side, so now this equation is balanced.

What will happen if HI is removed from a reaction vessel containing this

reaction at equilibrium?

H2+ 12 22H1

A. The reaction will slow down.

B. There will be no effect.

C. The rate of the forward reaction will increase.

D. The rate of the backward reaction will increase.

SUBMIT

**Answer:**

C I think

**Explanation:**

There will be no effect if **HI **is removed from a reaction vessel containing this reaction at **equilibrium**. When **HI **remove, **concentration **of all three component is change and reach a new **equilibrium **stage.

H2 + I2 ⇄ 2HI

So, B is correct option.

What is equilibrium?The stage in **reversible reaction **at which** rate of forward reaction** is equal to **rate of backward reaction** is equal is called an **equilibrium**.

To learn more about **equilibrium **here.

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HELP and give brainlys out to ppl who actually know the answer please help

**Answer:**

b. snake and earthworm

**Explanation:**

embryos are different from each other in early stages- all the others look similar

An empty steel container is filled with 2.0 atm of H₂ and 1.0 atm of F₂. The system is allowed to reach equilibrium according to the reaction below. If Kp = 0.45 for this reaction, what is the equilibrium partial pressure of HF?

The** equilibrium partial pressure** of HF is **0.55 atm.**

The **equation **of the **reaction **is;

H2(g) + F2(g) ⇄ 2HF

I 2 1 0

C -x -x +x

E 2 - x 1 - x x

We know that;

pH2 = 2.0 atm

PF2 = 1.0 atm

pHF = ??

Kp = 0.45

So;

Kp = (pHF)^2/pH2. pF2

0.45 = x^2/(2 - x) (1 - x)

0.45 = x^2/x^2 - 3x + 2

0.45(x^2 - 3x + 2) = x^2

0.45x^2 - 1.35x + 0.9 = x^2

0.55 x^2 + 1.35x - 0.9 = 0

x = **0.55 atm**

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PLS HELP THIS IS DUE IN 10 MINS!

Compare and contrast floods and droughts. Give two examples of how they are the same and two examples of how they are different.

Same: Both are natural disasters. Both are becoming more common to due climate change.

Different: Floods are an excess amount of water whereas droughts are a lack of water for a prolonged period of time. Floods are more common in coastal areas whereas droughts are most common in the Midwest and South.

Different: Floods are an excess amount of water whereas droughts are a lack of water for a prolonged period of time. Floods are more common in coastal areas whereas droughts are most common in the Midwest and South.

4. What is the specific heat of a substance if 5800 joules is

released in a 250 gram sample that will cool the substance from

60 degrees to 45 degrees?

**Answer: 23.2 **

**Explanation:**

oil has a density of 8.5kg/L. what is the volume of 5.4kg oil

**Answer:**

0.64 L

**Explanation:**

**Step 1: Given data**

**Step 2: Calculate the volume corresponding to 5.4 kg of oil**

Density is an intrinsic property and it is equal to the quotient between the mass and the volume.

ρ = m/V

V = m/ρ

V = 5.4 kg/(8.5 kg/L) = 0.64 L

A severe storm would be most likely to damage a coastal area by causing

A.

volcanoes.

B.

pollution.

C.

erosion.

D.

earthquakes.

D earthquakes

my teacher told me

my teacher told me

A severe storm would be most likely to damage a coastal area by causing **pollution**. Therefore, the correct option is **option B.**

The **region **where land joins the ocean, or even as a line defining the border between the land as well as the shoreline, is known as the **coast**, sometimes referred as the coastline and seashore. The terrain of the area's surroundings has an impact on shorelines, as do water-induced erosion processes like wave action.

The length of the shoreline on Earth is about 620,000 kilometers. Natural ecosystems' coasts are significant zones and frequently the site of a diverse range of biodiversity. They are home to significant **ecosystems **on land, such as freshwater and estuarine wetlands, that are crucial for the survival of bird populations or other land animals. A severe storm would be most likely to damage a coastal area by causing **pollution**.

Therefore, the correct option is** option B.**

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State the coefficient required to correctly balance the following chemical equation:

__KCI + __Fe —-> __FeCI2+ __K

**Answer:**

2KCl+Fe---->FeCl2+2K

**Explanation:**

You can observe that the no.of atoms in reactant side is equal to that of products side of each element.

Determine if the following two structures are

identical, isomers, or unrelated?

A

B

С

identical

isomers

unrelated

**Answer:**

its C

**Explanation:**

The **skeletal structure **shows the outline of the** compound **with lines and bonds. Both the structures are **unrelated**. Thus, option **C **is correct.

**Isomers **are **structures **with identical molecular structures but differ in the skeletal or **molecular representation**. They also have varied **properties **as compared to the **parent **structure.

**Identical **compounds are structures that have the **same atoms **and are arranged with the same **spatial design **and orientation. The number of **atoms **and the spatial **arrangement **of the two **compounds **is different.

Therefore, the two **compounds **are **unrelated**.

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Please help ASAP! Please and thank you have a great and blessed day!,

the answer is “Mineral”

Yea I confirm that the answer I indeed mineral.

The nucleus of an atom stays together only because the repulsive forces, called

forces, are overcome by

even stronger attractive forces.

fusion

nuclear

electrostatic

**Answer:**

Electrostatic

**Explanation:**

The forces that are overcome are the repulsive **electrostatic** forces between the protons (all charged positively).

A pair of sneakers that cost $90 last year has now been marked up 25%. Mariel has a coupon that is going to take 10% off the price of the shoes. Is the price that she will pay equivalent to a 15% markup of the original cost of the shoes? Show your work.
Help plzSimplify.8u+9v+3u5v11u + 14v15uv11u + 4v5u + 4v
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