A scientist observes several different fossils in a
rock layer. Based on this observation, which is
the best conclusion?
A. The fossils are composed of lava that cooled
around several organisms.
B. The fossils formed about the same time as the
rock layer in which they were found.
C. The fossils formed after heat and pressure
changed the type of rock in the rock layer.
D. The fossils are composed of the same material
as the organisms from which they formed.

Answer:

The level of mercury in the tube will be 118 mmHg

Explanation:

As per the given data

Pressure of container = P1 = 116 kPa

Pressure of atmosphere = P2 = 752 mmHg

First, we need to convert the pressure of the container in mmHg as follow

P1 = 116 kPa x [tex]\frac{1 atm}{101.325 kPa}[/tex] x [tex]\frac{760 mmHg}{1 atm}[/tex] = 870 mmHg

Hence the pressure in the container is higher than the pressure of the atmosphere and the mercury level will increase.

Now calculate the level of mercury in the tube as follow

Level of Mercury = Pressure of container - Pressure of atmosphere

P = P1 - P2

P = 870 mmHg - 752 mmHg

P = 118 mmHg

Answer:

160000

Explanation:

F=ma

m=40000

a=4

if a 40,000 kilogram plane is accelerating at a rate of 4 meters/second², then the force generated by the engine would be 160000 Newtons.

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

As given in the problem we have to find out the force generated by the engine of the plane if a 40,000-kilogram plane is accelerating at a rate of 4 meters/second²,

The mass of the plane = 40000 kilograms

The acceleration of the plane = 4 meters/second²

The force generated by the engine of the plane = 40000×4

                                                                              = 160000 Newtons

Thus, the engine would generate a force of  160000 Newtons.

To learn more about Newton's second law here, refer to the link;

brainly.com/question/13447525

#SPJ2

Answer:

3.10 × 10⁻⁴ mg

Explanation:

In the Minnesota Department of Health set a health risk limit for benzene in groundwater of 10.0 μg/L. Suppose an analytical chemist receives a sample of groundwater with a measured volume of 31.0 mL. Calculate the maximum mass in milligrams of benzene which the chemist could measure in this sample and still certify that the groundwater from which it came met Minnesota Department of Health standards. Be sure your answer has the correct number of significant digits.

Step 1: Given data

Step 2: Convert "V" to L

We will use the conversion factor 1 L = 1000 mL.

31.0 mL × 1 L/1000 mL = 0.0310 L

Step 3: Calculate the maximum mass of benzene (m)

We will use the following expression.

m = C × V = 10.0 μg/L × 0.0310 L = 0.310 μg.

Step 4: Convert "m" to mg

We will use the conversion factor 1 mg = 1000 μg.

0.310 μg × 1 mg/1000 μg = 3.10 × 10⁻⁴ mg

Answer:

0.074M is concentration of the HNO₃ solution

Explanation:

The reaction of neutralization of nitric acid, HNO₃ with NaOH is:

HNO₃ + NaOH → H₂O + NaNO₃

Where 1 mole of nitric acid reacts per mole of NaOH

Based on the chemical reaction, the moles of NaOH at equivalence point are equal to moles of HNO₃ presents in the solution. With the moles and the volume we can find molarity as follows:

Moles NaOH = Moles HNO₃:

0.14L * (0.2mol NaOH / L) = 0.028mol NaOH  = 0.028mol HNO₃

Molarity:

0.028mol HNO₃ / 0.38L =

Answer:

the aware is 6182

Explanation:

jejejieieiejeie

Answer:

CH₄ + 2O₂ —> CO₂ + 2H₂O

Explanation:

The thermochemical equation for the combustion of methane can be obtained as follow:

Methane (CH₄) under goes combustion in the presence of air (O₂) to produce carbon dioxide (CO₂) and water (H₂O). This can be represented in the equation below:

CH₄ + O₂ —> CO₂ + H₂O

Thus, we can balance the equation as follow:

CH₄ + O₂ —> CO₂ + H₂O

There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of H₂O as shown below:

CH₄ + O₂ —> CO₂ + 2H₂O

There are a total of 4 atoms of O on the right side and 1 atom on the left side. It can be balance by putting 2 in front of O₂ as shown below:

CH₄ + 2O₂ —> CO₂ + 2H₂O

Now the equation is balanced.

Answer:

[tex]\% m/m =7.61\%[/tex]

Explanation:

Hello!

In this case, since the percentage by mass of a solute in a solvent is computed as shown below:

[tex]\% m/m=\frac{m_{solute}}{m_{solute}+m_{solvent}} *100\%[/tex]

Now, as the solute here is calcium chloride and has a mass of 35.0 g and the solvent is water with a mass of 425.0 g, we can compute the percentage by mass as shown below:

[tex]\% m/m = \frac{35.0g}{35.0g+425.0g} *100\%\\\\\% m/m=7.61\%[/tex]

Best regards!

Answer:

[tex]= \mathbf{C_3H_6O}[/tex]

Explanation:

From the given information, since the molecular mass of the ion M+ is not given;

Let's assume M+ = 58.0423

So, by applying the 13th rule;

we will need to divide the mass by 13, after dividing it;

The quotient n = no. of carbon; &

The addition of the quotient (n) with the remainder r =  no. of hydrogen.

So;

[tex]\dfrac{58}{13}= 4 \ remainder \ 6[/tex]

So;

[tex]C_nH_{n+r} = C_4H_{4+6}[/tex]

[tex]= C_4H_{10}[/tex]

From the given information; we have oxygen present, so since the mass of oxygen = 16, we put oxygen in the molecular formula by removing [tex]CH_4[/tex]. Also, since the mass is an even number then Nitrogen is 0.

So, we have:

[tex]= \mathbf{C_3H_6O}[/tex]

Explanation:

aC2H6 + bCO2 + cH2O → dC2H5OH

The balanced equation for the reaction is given as;

6C2H6 + 2CO2 + 3H2O → 7C2H5OH

Check!

Oxygen

Reactant = 2 * 2  +  3  =  7

Product = 7

Carbon

Reactant = 6 * 2  +  2  = 14

Product = 7 * 2 =14

Hydrogen

Reactant = 6 * 6  + 3 * 2  = 42

Product = 7 * 5 + 7 * 1 = 42

a = 6

b = 2  

c =  3

d = 7

Answer: Sorry I try to download it but it not showing anything, if you take a picture of the work maybe I would do it....

Explanation:

Answer:

objects with little friction, and little density

Explanation:

substances such as, jelly share similar physical properties

Answer: D

Explanation:

A  wavelength is the distance from one compression to the next compression in a longitudinal wave. so, option D is correct.

A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now used to describe the sound spectrum and vibration spectrum.

When electromagnetic radiation such as radio waves, light waves, or infrared waves travel across space, they leave behind distinctive patterns. Each wave has a distinct size and form. Wavelength is the separation between peaks.

In general, the electromagnetic spectrum is split into seven sections, rising in energy and frequency and decreasing in wavelength. Common names for these types of radiation include radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays, and gamma rays.

Thus, option D is correct.

To learn more about wavelength, follow the link;

https://brainly.com/question/12924624

#SPJ5

Answer:

omg that song l0wkey but high.key slaps

can you not please? this is an education website

Answer:

because the soap and the water mix and make bubblesl

Explanation:

This question is incomplete, the complete is;

Water has a heat of vaporization (ΔHvap) of 44.01 kJ mol-1 and boils at 100 degrees C at sea level.

What is the boiling point of water  at the top of Mount Everest where the atmospheric pressure is only 34% as strong as the pressure at sea level?

Answer: the boiling point of water at the top of mount Everest where the atmospheric pressure is only 34% as strong is 74 °C

Explanation:

Given that;

P1 = 1 atm,

T1 = 100°C =  373 K

P2 = P1 × 34% = 1×0.34 = 0.34 atm

T1 = ?

ΔH = 44.01 kJ mol⁻¹ = 44.01×10³ J/mol

R = 8.314 J/k.mol

now using the Clausius - Clapeyron equation;

p1_∫^p2 d.InP = ΔHvap/R T1_∫^T2. 1/T².dT

⇒ In(P2/P1) = ΔHvap/R (1/T1 - 1/T2)

so we substitute;

ln( 0.34/1 ) = ( 44.01×10³ / 8.314) × ( 1/373 - 1/T2)  

-1.0788 = 5293.4808 × ( 0.00268 - 1/T2)

-1.0788 = 14.1865 - 5293.4808(1/T2)

5293.4808(1/T2) = 14.1865 + 1.0788

5293.4808(1/T2) = 15.2653

(1/T2) = 15.2653 / 5293.4808

(1/T2) = 0.0028837

T2 = 1 / 0.0028837

T2 = 346.8 K

WE convert to Celsius

t2 =346.8 K − 273.15 = 73.65 °C ≈ 74 °C

Therefore, the boiling point of water at the top of mount Everest where the atmospheric pressure is only 34% as strong is 74 °C

Answer:

C₄H₁₀O₄

Explanation:

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

Mass of compound = 4 g

Molar mass of compound = 152 g/mol

Mass of CO₂ = 5.79 g

Mass of H₂O = 2.84 g

Molecular formula of compound X =?

Next, we shall determine the mass of Carbon, Hydrogen and Oxygen in the compound. This can be obtained as follow:

For Carbon (C):

Mass of CO₂ = 5.79 g

Molar mass of CO₂ = 12 + (2×16) = 44 g/mol

Mass of C = 12/44 × 5.79

Mass of C = 1.58 g

For Hydrogen (H):

Mass of H₂O = 2.84 g

Molar mass of H₂O = (2×1) + 16 = 18 g/mol

Mass of H = 2/18 × 2.84

Mass of H = 0.32 g

For Oxygen (O):

Mass of C = 1.58 g

Mass of H = 0.32 g

Mass of compound = 4 g

Mass of O =?

Mass of O = (Mass of compound) – (Mass of C + Mass of H)

Mass of O = 4 – (1.58 + 0.32)

Mass of O = 4 – 1.9

Mass of O = 2.1 g

Next, we shall determine the empirical for compound X. This can be obtained as follow:

C = 1.58 g

H = 0.32 g

O = 2.1 g

Divide by their molar mass

C = 1.58 / 12 = 0.13

H = 0.32 / 1 = 0.32

O = 2.1 / 16 = 0.13

Divide by the smallest

C = 0.13 / 0.13 = 1

H = 0.32 / 0.13 = 2.46

O = 0.131 / 0.13 = 1

Multiply by 2 to express in whole number

C = 1 × 2 = 2

H = 2.46 × 2 = 5

O = 1 × 2 = 2

Thus, the empirical formula for the compound is C₂H₅O₂

Finally, we shall determine the molecular formula for the compound. This can be obtained as follow:

Molar mass of compound = 152 g/mol

Empirical formula => C₂H₅O₂

Molecular formula =?

Molecular formula => [C₂H₅O₂]ₙ

[C₂H₅O₂]ₙ = 152

[(2×12) + (5×1) + (2×16)]n = 152

[24 + 5 + 32]n = 152

61n = 152

Divide both side by 61

n = 152 / 61

n = 2

Molecular formula => [C₂H₅O₂]₂

Molecular formula => C₄H₁₀O₄

Answer:

Functional groups

Explanation:

A functional group refers to an atom or cluster of atoms that are covalently bonded to carbon and influence the behavior of organic compounds.

There are several functional groups in organic chemistry that determine the properties of organic compounds.

For instance, in the compound CH3CH2CH2CH2OH, the functional group is the -OH group. The chemical and physical properties of this compound is largely determined by this functional group.

Answer:

hydrogen bonding

Explanation:

Answer:

the temperature of gas inside the container is 195.2 K.

Explanation:

Given;

volume of gas in the container, V = 3.45 L

pressure of gas in the container, P = 2.14 atm

number of gas moles, n = 0.461 mol

The temperature of gas inside the container is calculated as;

[tex]PV = nRT\\\\T = \frac{PV}{nR}[/tex]

where;

R is gas constant = 0.08205 L.atm/mol.K

[tex]T = \frac{2.14 \ \times \ 3.45}{0.461 \ \times \ 0.08205} \\\\T = 195.2 \ K[/tex]

Therefore, the temperature of gas inside the container is 195.2 K.

Answer:

If I were an element, I would want to be Carbon. I would want to combine with  oxygen. It would create carbon dioxide. It has daily life uses. For heat, and for refridgment and more.

Explanation:

ANSWER

Selenium has 34 protons

Answer:

Explanation:

All three of these elements fall in group 7 of the periodic table and are called Halogens. Chlorine is the most reactive of these elements because it comes before the other two in the table then followed by Bromine and then Iodine.

Reactivity decreases in the group 7 elements as one moves to the latter elements due to the increase in shells surrounding the nucleus.

This is because reactivity happens as the protons in the nucleus attract electrons but when more shells are piled on, the strength of this attraction decreases as the distance increases such that they will not be as reactive anymore.

Answer:

1.=fracture.... Balance: Consider balance training and physical therapy if your body feels off. Use a cane or walker if you need to.

2.=dislocation.... Wearing protective gear during contact sports.

3.=sprain...Take precautions to prevent falls, such as holding handrails on stairways, avoiding slippery surfaces, and keeping your floors uncluttered.

The practices/activities which should be done to avoid the following injuries

include

Read more on https://brainly.com/question/20885020

Explanation:

Examples of an application include a word processor, a spreadsheet, an accounting application, a web browser, an email client, a media player, a file viewer, simulators, a console game, or a photo editor.

Answer:

B. first level consumers.

Explanation:

The first level consumers are also the primary consumers. They are the animals that depends or rely on plants to transform chemical energy into carbohydrates and sugar.

Primary consumers are mostly herbivores. They feed on plant matter by which they derive their nutrition. They have special enzymes that helps to convert plant materials into substances needed for their body.

So, the first level consumer takes plant matter and convert them into useful food materials for their own nutrition.

The second level consumers depend on the first level consumers for nutrition.

Answer:

V2 = 12 L

Explanation:

Given the following data;

Initial volume = 2L

Initial pressure = 3 atm

Final pressure = 0.5 atm

To find the new volume V2, we would use Boyles' law.

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

[tex] PV = K[/tex]

[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]

Substituting into the equation, we have;

[tex] 3 * 2 = 0.5V_{2} [/tex]

[tex] 6 = 0.5V_{2} [/tex]

[tex] V_{2} = \frac {6}{0.5}[/tex]

[tex] V_{2} = 12 [/tex]

V2 = 12L

Therefore, the new volume is 12 Liters.

Answer:

34.02 g.

Explanation:

Hello!

In this case, since the gas behaves ideally, we can use the following equation to compute the moles at the specified conditions:

[tex]PV=nRT\\\\n=\frac{1.00atm*0.960L}{0.08206\frac{atm*L}{mol*K}*(150+273)K} =0.0277mol\\\\[/tex]

Now, since the molar mass of a compound is computed by dividing the mass over mass, we obtain the following molar mass:

[tex]MM=\frac{0.941g}{0.0277mol} \\\\MM=34.02g/mol[/tex]

So probably, the gas may be H₂S.

Best regards!