The diagram represents a section of Earth that a paleontologist, a
scientist who studies fossils, has been working with for years. Which
statement correctly describes this diagram?
a
b
Layer W contains fossils of organisms that existed on Earth after the organisms found in layers U and R.
Layer U contains fossils of organisms that are older than the organisms found in layer R.
Layers W and U contain fossils that are animal species.
Layers R and W contain fossils that are both types of plant species.
C с
Od

Answer: 129.93577

Explanation:

There-

Answer:

1-

A) H2O        B) HCO3-

2-

A) NH3         B) SO3-2

Explanation:

Answer:

C

Explanation:

The balanced equation for breakdown of barium chlorate into barium chloride and oxygen as follows: [tex]\rm 2 Ba(ClO_3)_2 \rightarrow 2 BaCl_2 + 3 O_2[/tex]

In chemistry, a balanced equation is one that depicts a reaction in which there are the same numbers of atoms of each element on both sides of the equation. The idea that matter is neither generated nor destroyed during a chemical reaction is known as the conservation of mass.

It is possible to write the equation for the balanced breakdown of barium chlorate into barium chloride and oxygen as follows: [tex]\rm 2 Ba(ClO_3)_2 \rightarrow 2 BaCl_2 + 3 O_2[/tex] . The number of atoms must be taken into consideration in this balanced equation by multiplying the subscripts inside brackets by the coefficient outside of the brackets. With the same number and kinds of atoms on both sides of the reaction, this guarantees that the equation complies with the rule of conservation of mass.

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Answer:

21.4

Explanation:

Mass = M/V

42.8/2.0 = 21.4

:)

Answer:

B: nuclear energy.

Explanation:

It is emission-free and it saves 2.4 billion tons of carbon emissions per year. Also, the level of hazard of nuclear waste does decrease during the time.

Hope that helps!

Answer:

Deposition

Explanation:

Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.

Answer:

Explanation:

Both plastic and gasoline are products of pretroleum

Answer:

A. The color change from blue to green happens in nature.

Explanation:

The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.

The evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.

The electrochemical series is arrangement of elements in order of decreasing reactivity. It is important to note that the elements that are high up in the electrochemical series can displace the elements that are lower in the series from their aqueous solution.

Steel contains iron which lies above copper in the electrochemical series hence a chemical change occurs when steel dissolves in the copper solution.

Hence, the evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.

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*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

The concentration of ethanol in this solution : 2.14 M

Molarity is a way to express the density of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\tt \large{\boxed{\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

Ethanol(C₂H₅OH) MW =46,06844 g/mol[

[tex]\tt 50\times 0.79=39.5~g[/tex]

[tex]\tt \dfrac{39.5}{46.06844}=0.8574[/tex]

[tex]\tt \dfrac{0.8574}{0.4}=2.14~M[/tex]

Answer:

E = 3.035× 10-¹⁹J = 1.9eV

f = 4.58 × 10¹⁴Hz

Explanation:

wavelength = 6.55 × 10-⁷m

c = 3 × 10⁸m/s

f = ?

E = ?

a) f = c/wavelength

f = 3 × 10⁸/6.55 × 10-⁷

f = 4.58 × 10¹⁴Hz

b) E = hc/wavelength

E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷

E = 3.035 × 10-¹⁹J

1ev = 1.6 × 10-¹⁹J

Therefore E = 3.035/1.6 = 1.9eV

Answer:

[tex]\huge\boxed{\sf Acid}[/tex]

Explanation:

An acid has the following properties:

=> Is corrosive to Iron and reacts with it.

=> Has a sour taste.

=> Produces a burning sensation when touched.

So, Substance A is an acid.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

a. CH3

Hope this helps.

Answer:

I think the answer is A. I am only 50% sure I am correct, but hope it helps!

Explanation:

Answer:

Grating

Explanation:

I think you need to grate it

Answer: The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separate

Explanation:

Answer:

I did this already

................

Answer: gas are well separated with no regular arrangement.

               liquid are close together with no regular arrangement.

                solid are tightly packed, usually in a regular pattern.

its just gas liquid and solid pls make me brainliest

Explanation:

The rollercoaster has a speed of 176 ft/sec. This can be converted to miles per hour. The speed is equivalent to 120 mph.

Speed is a physical quantity measuring the distance travelled by an object per unit time. Speed is a scalar quantity. The rate of speed is called velocity.

The speed can be expressed in different units. such as m/s, km/h, ft./s miles per hour etc. These units can be interconverted using specific relations.

One ft/s = 0.682 mph

then, 176 ft./s  = 0.682 × 176 = 120 mph.

Therefore, the speed of the roller coaster is 120 mph.

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Answer:a and d

Explanation:

The properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.

Ionic solids are made up of ions joined together by ionic bonds. "Ionic bonding" is a type of chemical bond between a positive and a negatively charged ion where the transfer of electrons occurs.

They are too hard, and the ionic solids’ melting point is usually too high due to powerful forces between the anions and cations.

They are known as electrical insulators when they are in a solid-state. Apart from this, the molten salts do behave with electricity since the ions are not closed in the lattice.

Therefore, the properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.

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Answer: i think it is A

Explanation:

hope this helps!

Answer:

2.5 I don't have a explanation

Answer:

tell how you feel

Explanation:

don't be afraid to express your feeling.  

Answer:

slowly approach them and tell your feelings

Answer:

what

Explanation:

I cant see your question yet

Answer:

the question really said :

Answer:

what that girl said lol

Answer:

honestly.. idk lol

Explanation:

The source of alpha particles in a smoke detector is the Americium.

Answer:

V = 16.81 L

Explanation:

Given data:

Number of moles = 0.75 mol

Temperature = standard = 273 K

Pressure = 1 atm

Volume of balloon = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will rearrange the formula.

V = nRT/P

V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm

V = 16.81 atm.L/ 1 atm

V = 16.81 L

Answer:

A wave with a higher frequency have a shorter wavelength, the higher the sound it, the closer the arcs of the wavelength are, the faster the sound is, the shorter they are.

According to scied.ucar.edu  ~  "The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. Light waves have very, very short wavelengths."

Hope this helps

Explanation:

May I have brainliest please? :)

A wave with a higher frequency has a longer wavelength is a false.

A wave with a higher frequency has a longer wavelength is a false statement because shorter wavelength have higher frequency and also higher energy.

We know that longer wavelength of a wave having shorter frequency and shorter energy while on the other hand, the shorter wavelength of a wave having higher frequency and higher energy so we can conclude that the statement is false.

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