What did Aristotle believe?
A. That matter did not exist in the physical world
B. That the scientific method should be used to test ideas
C. That all matter was composed of earth, fire, water, and air
D. That all matter was composed of tiny atoms

Answer : i think the answer is A

Explaination : its not D , C i feel like it would be bigger so there would be more transpiration an B less would not have bigger so i hope this helps have a good day ☆

Answer:

it's mass

Explanation:

just trust me it's just mass

Answer:

the answer is B

hope this helped!

Answer:yes

Explanation:it doesnt know

The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is  72.166%.

Percent composition is very straightforward. Percent composition indicates the percentage of each element in a compound by mass. A chemical compound is made up of two or more elements.

Percent composition is important because it allows us to calculate the percentage of each element in a compound. Here, the quantity is measured in terms of grams of the elements present.

For example, if we know the mass and chemical composition of a substance, we can find out the number of moles and calculate the number of atoms or molecules in the sample.

In  Be(NO3)2 the percent composition of Beryllium (Be) is 6.775%, Nitrogenium (N) is 21.060% and Oxygenium (O) is72.166%.

Thus, The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.

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Answer:

176 g of CO₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2C₂H₂ + 5O₂ —> 4CO₂ + 2H₂O

Next, we shall determine the mass of C₂H₂ that reacted and the mass of CO₂ produced from the balanced equation.

This is illustrated below:

Molar mass of C₂H₂ = (2×12) + (2×1)

= 24 + 2 = 26 g/mol

Mass of C₂H₂ from the balanced equation = 2 × 26 = 52 g

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32 = 44 g/mol

Mass of CO₂ from the balanced equation = 4 × 44 = 176 g

From the calculations made above,

52 g of C₂H₂ reacted to produce 176 g of CO₂.

Answer:

Explanation:

Each magnesium atom loses two electrons and each iodine atom gains one electron. So there should be a 1-to-2 ratio of magnesium ions to iodide ions.

Answer:

Explanation:

I'd say art

Answer:

m = 2.18x10¹⁵ tons of ice

Explanation:

To solve this exercise, we need to work with the same units of conversion. In this case let's see the conversion of every unit here:

1 mi = 5280 ft

1 ton = 1000 kg

1 kg = 1000 g

1 mL = 1 cm³

1 mi = 1609.34 m or 160,934 cm

Now that we know the units, let's analyze the data.

The landscape has a 500,000 mi² of area, this is however without including the ice. The ice is apart, and has a 7520 ft of height. And if the landscape wouldn't have ice, then the height will be 1500 ft only.

With that data, we can know the actual height of the ice by a simple difference:

Hi = Hli - Hl

Where:

Hi: Height of ice

Hli: Height of ice + landscape

Hl: Height of landscape

Applying this expression, the height of ice is:

Hi = 7520 - 1500 = 6020 ft of ice

Now that we know the height of the ice, we can calculate the volume of whole landscape. But first, let's do the conversion of foot to mile:

Hi = 6020 ft * (1 mi/5280 ft) = 1.14 mi

And now, let's calculate the volume of the landscape in mile, and then, to centimeter:

V = 1.14 mi * 500,000 mi² = 570,000 mi³

To convert the cubic mile to cubic centimeter we just do the following:

V = 570,000 mi³ * (160934 cm / 1 mi)³ = 2.38x10²¹ cm³

Now, we can get the mass of the ice using the given density of ice (d = 0.917 g/cm³)

If d = m/V  

then m = d * V

Replacing the data:

m = 0.917 g/cm³ * 2.38x10²¹ cm³

m = 2.18x10²¹ g

Finally, the tons of ice will be:

m = 2.18x10²¹ g * (1 kg / 1000 g) * (1 ton / 1000 kg)

Hope this helps

Answer:

60.1 i think

Explanation:

Answer:

pH = 4.349

Explanation:

When HI is added to sodium acetate, CH3COONa, acetic acid is produced as follows:

CH3COONa + HI → CH3COOH + NaI

That means the moles of HI added are the moles of acetic acid produced and the moles of sodium acetate consumed.

Moles of HI:

0.0605L * (0.223mol/L) = 0.01349mol

To find pH of the buffer (Mixture of weak acid, acetic acid, and conjugate base, sodium acetate) we need to solve H-H euation:

pH = pKa + log [CH3COONa] / [CH3COOH]

Where pKa is -log of Ka of the acid: -log1.8x10⁻⁵ = 4.745

And [] could be taken as moles of each specie

Moles CH3COONa:

Inital moles: 0.086L * (0.385mol/L) = 0.03311

Final moles: 0.03311mol - 0.01349mol = 0.01962mol CH3COONa

Moles CH3COOH:

Inital moles: 0.086L * (0.410mol/L) = 0.03256

Final moles: 0.03256mol + 0.01349mol = 0.04875mol CH3COOH

pH = 4.745+ log [0.01962mol CH3COONa] / [0.04875mol CH3COOH]

pH = 4.3497

Rigth answer is:

Answer: 4.80 * 10¹⁴s⁻¹

Explanation:

Speed = Frequency * Wavelength

So:

Frequency = Speed/ Wavelength

Speed of light = 3 * 10⁸ m/s

Frequency = (3 * 10⁸ m/s) / (6.25 x 10⁻⁷m)

= 4.80* 10¹⁴hz

= 4.80 * 10¹⁴s⁻¹

The frequency of the electromagnetic wave is  4.8 x 10¹⁴s⁻¹

In an Electromagnetic wave, The frequency , speed and wavelength of an are related by the formula

λ=  c/f

where

λ = wavelength in metres, m.

c= speed of light  in metres per sec, m/s

f= frequency in per seconds or hertz,( s⁻¹ , Hz)

Given that Wavelength of the electromagnetic wave is 6.25 x 10-7m.

We know that speed of light is 3 x 10⁸ m/s

Substituting the values into the equation becomes

f  =  c/  λ

f= 3 x 10 ⁸m /s  / 6.25 x 10⁻⁷ m  = 4.8 x 10¹⁴s⁻¹

Hence, The frequency of the electromagnetic wave is  4.8 x 10¹⁴s⁻¹

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Answer:

Explanation:

This is what I would answer and I might be wrong***

1. Crest

2. The Moon reflects light from the Sun

3. Population of the region

4. Inner Planets

5. Tropical

6. Pollution (I am not 100% but it would make sense because pollution is long term consequences)

7. New Moon

8. Cleanliness of washed dishes

9. Analog signals are more prone to distortion.

10. Red wavelength are reflected while all others are absorbed

11. Tied back (I would assume)

12. New Moon (I think)

13. Trough

14. The planets revolve around the Sun

15. Frequency

16. Decreases

17. furthest; least

18. ? sry I don't get what the question is trying to ask.

19. wavelength

20. independent; dependent

21. Sun; Earth

Answer:

1) Crest

2)D

3) distance from ocean

4) outer planets

5)tropical

6)air pressure

7)new moon

8)Temp of water

9)C i think

10)B

(still finding answers)

Explanation:

Answer:

189.71 secs

Explanation:

We know that decomposition is a first order reaction;

So;

ln[A] = ln[A]o - kt

But;

[A]o = 1.00 M

[A] = 0.250 M

t =135 s

Hence;

ln[A] -  ln[A]o = kt

k = ln[A] -  ln[A]o/t

k = ln(1) - ln(0.250)/135

k =0 - (-1.386)/135

k = 1.386/135

k= 0.01

So time taken now will be;

ln[A] -  ln[A]o = kt

t = ln[A] -  ln[A]o/k

t = ln (3) - ln(0.450)/0.01

t = 1.0986 - (-0.7985)/0.01

t = 1.0986 + 0.7985/0.01

t = 189.71 secs

Answer:

The 2nd answer.

Explanation:

DNA makes people who are related look similar to eachother.

Answer:

antimony

Explanation:

The representation of the electrons in the shell is called electronic configuration.

The correct answer is antimony

The shell is as follows:-

These are the shells in which electrons are filled.

The total number of electrons is 2+2+6+2+6+2+10+6+2+7= 45

After calculating the electrons, the total number of electrons is 45 which is the atomic number of antimony.

Hence, antimony is the correct option.

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The answer is (3). The number of Sr is the same so if the compound has the smallest gram formula mass, it has the highest percent composition by mass of strontium. So the answer is (3).

The study of chemical is called chemistry.

The correct answer to the question is option C that is C SrS.

The molecular mass of Sr is 87.62 and sulfur is 32 after joining these we will get 123.22.

Hence, the correct answer is option C.

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Answer: The value of [tex]\Delta H[/tex] is 1118 .

Explanation:

To calculate the number of moles,  we use the equation:

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{molar mass}}[/tex]    

[tex]\text{Moles of} H_2S}=\frac{9.82g}{34.1g/mol}=0.288mol[/tex]    

The balanced chemical reaction is:

[tex]2H_2S(g)+3O_2(g)\rightarrow 2H_2O(l)+2SO_2(g)[/tex]

Given :

Energy released when 0.288 mole of [tex]H_2S[/tex] is reacted =  161 kJ

Thus Energy released when 2 moles of [tex]H_2S[/tex] is reacted = [tex]\frac{161}{0.288}\times 2=1118kJ[/tex]

Thus the value of [tex]\Delta H[/tex] is 1118.

Answer:

the answer is B:) have a good day

Answer:

Copper

Explanation:

Answer:

0.302L

Explanation:

...97.1mL of 1.21m M aqueous magnesium fluoride solution

In this problem the chemist is disolving a solution from 1.21mM = 1.21x10⁻³M, to 389μM = 389x10⁻⁶M. That means the solution must be diluted:

1.21x10⁻³M / 389x10⁻⁶M = 3.11 times

As the initial volume of the original concentration is 97.1mL, the final volume must be:

97.1mL * 3.11 = 302.0mL =

0.302L

Answer:

Average atomic mass = 17.5 amu.

Explanation:

Given data:

X-17 isotope = atomic mass17.2 amu, abundance:78.99%

X-18isotope =  atomic mass 18.1 amu, abundance 10.00%

X-19isotope = atomic mass:19.1 amu, abundance: 11.01%

Average atomic mass of X = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass)  / 100

Average atomic mass  = (78.99×17.2)+(10.00×18.1) +(11.01+ 19.1) /100

Average atomic mass =  1358.628 + 181 +210.291 / 100

Average atomic mass  = 1749.919 / 100

Average atomic mass = 17.5 amu.

Answer:

y¹³

Explanation:

because it's a multiplication question we add exponents

8 + 5 = 13

so it's y¹³

Answer:

Both the identity and the properties of a substance change.

Explanation:

During most chemical reactions, both the identity and the properties of substances changes. The chemical and physical properties of a substance often changes during this kind reaction.

A chemical change has the following properties:

Answer:

Both the identity and the properties of a substance change.

Explanation:

In a chemical change, the matter gets transformed or changed into a new substance. In doing this, the identity of the substance, and its properties change as well.

- I got the question right on the quiz and got 100%

Hope this helps!

The volume of HCl = 2.10⁴ mL

Given

5.0 M(mol/L) HCl solution

3 g of Mg

Required

Volume of HCl

Solution

Reaction

Mg + 2HCl ⇒ MgCl₂ + H₂

mol of Mg (Ar=24 g/mol) :

mol = mass : Ar

mol = 3 : 24

mol = 0.125

From the equation, mol ratio of Mg : HCl = 1 : 2, so mol HCl :

= 2/1 x mol Mg

= 2 x 0.125

= 0.25

Molarity : mol solute per liters solution

M = m x V

V = M : m

V = 5 mol/L : 0.25

V = 20 L = 2.10⁴ mL

in the equation of reaction given, breaking bonds in NaCl and H20 requires energy as they are both endothermic reactions.

A chemical reaction is a change which results in the permanent rearrangements of atoms of a substance and the formation of a new substance.

In a chemical reaction, bond breaking in endothermic reactions requires energy.

Therefore, in the equation of reaction given, breaking bonds in NaCl and H20 requires energy.

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Answer:

Breaking bonds in NaOH and HCl

Explanation:

its the correct answer

Answer:

y = -2.5 + x

Explanation:

Given the data:

__X____Y

$20 __$17.50

$21 __ $18.50

$22__ $19.50

$23__ $20.50

Using a linear regression calculator :

The linear regression model obtained is :

y = -2.5 + x

Where ; - 2.5 = intercept ; gradient / slope = 1