Can someone help me out with the question

Answer: most specimen that have lived on earth is still living here on earth

Explanation:

The statement correct about fossil record is option b. Extinction is rare a rare event and rarely seen in the fossil records.

Fossils are the preserved remains of decomposed plants and animals. There are mainly two types of fossils namely , body fossils and trace fossils. Body fossils include bones, skull, and other body parts.

Trace fossils are traces of some actions of organisms that lived in earth. For example foot prints, caves, shells etc. The entire  fossils—both known and unknown—along with their placement in strata and fossiliferous  rock formations are collectively referred to as the fossil record.

The fossil record was one of the earliest data sources used to support the study of evolution and is still important for understanding the evolution of life on Earth. Geologists can now calculate the numerical or absolute age of different strata.  It records extinction of some animals and plants as rare event.

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Answer:

8.45 L

Explanation:

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

Initial temperature (T₁) = 50 °C

Initial pressure (P₁) = 2 atm

Initial volume (V₁) = 5 L

Final temperature (T₂) = 0 °C

Final pressure (P₂) = 1 atm

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 50 °C

Initial temperature (T₁) = 50 °C + 273

Initial temperature (T₁) = 323 K

Final temperature (T₂) = 0 °C

Final temperature (T₂) = 0 °C + 273

Final temperature (T₂) = 273 K

Finally, we shall determine the new volume. This can be obtained as follow:

Initial temperature (T₁) = 323 K

Initial pressure (P₁) = 2 atm

Initial volume (V₁) = 5 L

Final temperature (T₂) = 273 k

Final pressure (P₂) = 1 atm

Final volume (V₂) =?

P₁V₁ / T₁ = P₂V₂ / T₂

2 × 5 / 323 = 1 × V₂ / 273

10 / 323 = V₂ / 273

Cross multiply

323 × V₂ = 10 × 273

323 × V₂ = 2730

Divide both side by 323

V₂ = 2730 / 323

V₂ = 8.45 L

Thus, the new volume is 8.45 L

Answer:

Heat:  It is a form of internal energy* obtained because of the random motion and the attractive force of molecules within the substance.

Temperature:  It is a quantity that determine which direction the heat energy will flow in.

Explanation:

Answer:

Calcium hydroxide is formed by one Ca2+ cation and two OH− anions, which implies that its chemical formula will be Ca(OH)2.

Here's how you'd figure this out. If you look at the periodic table, you'll see that calcium is in group 2. That means that it has two valence electrons that it must give up in order to be stable.

On the other hand, oxygen is in group 6, which means it needs 2 electrons in order to be stable. It gets one electron from a hydrogen atom to form an OH− anion. Now it only needs one more electron, which it gets from the two calcium has to offer.

This means that you'd need two OH− groups to form calcium hydroxide, since each OH− group would get one electron from calcium → Ca(OH)2.

hope this helped

Answer:

b potential hope this is right

Answer:

a. a gas is mad of tiny particles

Explanation:

I believe

Answer:

12 mol

Explanation:

Answer:

Molar mass of the unknown gas is 64.6 g/mol

Explanation:

Let's think this excersise with the Ideal Gases Law.

We start from the N₂. At STP conditions we know that 1 mol of anything occupies 22.4L.

We apply: P . V = n . R . T

5 atm . V = 1 mol . 0.082 . 325K

V = (1 mol . 0.082 . 325K) / 5 atm = 5.33 L

It is reasonable to say that, if we have more pressure, we may have less volume.

As this is the volume for 1 mol of N₂, our mass is 28 g. Then, the density of the nitrogen and the unknown gas is 28 g/5.33L = 5.25 g/L

Our unknown gas has, this density at 27°C and 2 atm.

If we star from this, again: 1 mol of any gas occupy 22.4L at STP, we can calculate the volume for 1 mol at those conditions:

P₁ . V₁ / T₁ = P₂ . V₂ / T₂

1 atm . 22,4L / 273K = 2 atm . V₂ / 300K

Remember that the value for T° is Absolute (T°C + 273)

[ (1 atm . 22.4L / 273K) . 300K] / 2 atm = V₂ → 12.3L

This is the volume for 1 mol of the unknown gas at 2 atm and 27°C

We use density to determine the mass: 12.3 L . 5.25 g/L = 64.6 g

That's the molar mass: 64.6 g/mol

Answer:

The gas pressure is raised by decreasing the volume of a gas. ... The particles can collide more often with the walls of the container because the volume has decreased. They exert force on them each time they collide with the walls. More collisions mean more force, so it will increase the strain.  

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Answer: The answer is 39.99711.

Explanation:

How many grams NaOH in 1 mol? The answer is 39.99711.

We assume you are converting between grams NaOH and mole.

You can view more details on each measurement unit:

molecular weight of NaOH or mol

This compound is also known as Sodium Hydroxide.

The SI base unit for amount of substance is the mole.

1 grams NaOH is equal to 0.025001806380511 mole.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between grams NaOH and mole.

Type in your own numbers in the form to convert the units!

Convert another chemical substance

Convert grams

NaOH

to moles  

Quick conversion chart of grams NaOH to mol

1 grams NaOH to mol = 0.025 mol

10 grams NaOH to mol = 0.25002 mol

20 grams NaOH to mol = 0.50004 mol

30 grams NaOH to mol = 0.75005 mol

40 grams NaOH to mol = 1.00007 mol

50 grams NaOH to mol = 1.25009 mol

100 grams NaOH to mol = 2.50018 mol

200 grams NaOH to mol = 5.00036 mol

Answer:

Buffers are solutions that resist changes in pH, upon addition of small amounts of acid or base. The can do this because they contain an acidic component, HA, to neutralize OH- ions, and a basic component, A-, to neutralize H+ ions. Since Ka is a constant, the [H+] will depend directly on the ratio of [HA]/[A-].

hope it's help

Answer:

You'd need 6.55 L of oxygen at STP to form that much water.

Explanation:

Answer:

Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.

Answer:

When the batter hits the ball, there is a force applied, and energy is transferred. The ball will move in the direction the force is pushing it. If two objects collide, energy will be transferred between both, and there will be a change in motion.

Explanation:

Answer:

C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18

Answer:

I think it is Magma

Answer:

54 °C

Explanation:

Step 1: Given and required data

Step 2: Calculate the initial temperature of water

We will use the following expression.

Q = c × m × (T₂ - T₁)

5.79 × 10⁵ J = 4.184 J/g.°C × 3010 g × (100 °C - T₁)

T₁ = 54 °C

Answer:

for the first question, the context is necessary in order to answer...

Fat is immiscible (does not mix) with water because fat is nonpolar and water is polar (remember like dissolves like: polar mixes with polar, nonpolar with nonpolar).

soap bubbles by having many soap molecules surround fat molecules with their nonpolar end, and direct their polar ends outwards.

For your second question:

Dirt and oil are nonpolar.  When we wash our bodies with water (which is polar) it does not do a good job in removing these nonpolar molecules.  Soap, on the other hand, has a long nonpolar end and a small polar end.  The nonpolar end of the soap molecule attaches to the dirt and oil on your skin and when the water from the shower head hits the soap, it pulls the dirt, oil, and soap off of you by attaching itself to the polar end of the soap molecule.

Explanation:

Answer:

Explanation:

Sorry, I don't really know about this. I hope it helps!

Answer:

A. These parts quickly decompose.

Explanation: This is because organs are made of tissues that decompose more quickly than bone. Animals mainly eat the organs and tissues of another, not the bones. This results in quick destruction of these parts that are left behind.

Have a blessed day/night! Please mark brainliest if correct! <3

The reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.

Fossilization is defined as the mechanisms that are physical, chemical, and biological that result in the long-term preservation of plant and animal remnants. Fossilization is a negative representation of the creature preserved in the substrate as a fossil. Any preserved remains, impression, or trace of a once-living thing from a previous geological age is referred to as a fossil.

Decomposition is defined as the method through which decomposing organic matter yields more basic organic or inorganic elements . The process of recycling nutrients that have been consumed by an organism to create its body begins with decomposition. It is the process through which the dead tissues disintegrate and change into more basic organic forms.

Thus, the reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.  

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Answer:

The average temp will increase

Explanation:

Carbon dioxide levels will cause global warming to increase and therefore the temp will increase

Hope this helps :)

Answer:

hydrogen

Explanation:

can i have brainliest please

Reaction 1 is the one that is different because there is only one product (option C).

In a reaction, there are two main components:

Moreover, a reaction can include two or more reactants as well as two or more products depending on the substances involved. Let's analyze reaction 1:

This means in this reaction there is only one product. This does not occur in reactions 2, 3, and 4 because in these there are two products.

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Answer:

convection cause it is vapor

Explanation: