What is a common ancestor?

Answers

Answer 1

Answer: In evolutionary biology, a common ancestor is allegedly a link between two varying branches or types of creatures. (Another word for these is 'missing links', since up to this point, not a single one of these common ancestors has been found in the fossil record)
Hope that helped =)

Answer 2

Answer: A Common ancestor is a organism that has shared predecessor of more then one different scion of a group of organisms.

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The liquids hexane and water are placed in a test tube. The test tube is stoppered, shaken, and placed in a test tube rack. The liquids separateinto two distinct layers because hexane and water have different (1) formula masses (2) molecular polarities (3) pH values (4) specific heats
Make the following conversion. 60.2 mg = _____ g
Is cloth a good insulator

A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.

Answers

The scientist will repeat the experiment to make sure thathis results are reliable.

Which type of stoichiometric calculation does not require the use of the molar mass?

Answers

The choices can be found elsewhere and as follows:

a. mass-mass problems
b. mass-volume problems
c. mass-particle problems
d. volume-volume problems

I believe the correct answer is option D. It is volume-volume problems that does not require the use of molar mass. Here you are dealing with molarities and volumes to determine concentrations. Molar mass is not part of any calculations.

Final answer:

The type of stoichiometric calculation that does not require the use of the molar mass is a calculation involving molar or stoichiometric ratios which are derived directly from the coefficients in a balanced chemical equation.

Explanation:

In stoichiometry, there are several types of calculations that can be performed. However, the type of stoichiometric calculation that does not require the use of the molar mass is the calculation involving the molar ratio, or stoichiometric ratio. This refers to the ratio of coefficients in a balanced chemical equation, which we use to determine the relative amounts of each substance involved in a chemical reaction.

An example of this is a balanced equation for the formation of water: H2 + 0.5O2 -> H2O. In this equation, the molar or stoichiometric ratio of hydrogen (H2) to oxygen (O2) to water (H2O) is 2:1:2. If we are given the number of moles of one substance, we can use this molar ratio to find the number of moles of any other substance in the equation, without needing to know their molar masses. This constitutes a stoichiometric calculation without the need for molar mass.

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Which polyatomic ion is found in the compound represented by the formula NaHCO3? (1) acetate (3) hydrogen sulfate (2) hydrogen carbonate (4) oxalate Any explanation for this question?

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Well....the answer is HCO3....but i don't know what it is said in worded form.

Looking at the names....it is probably Hydrogen Carbonate

Which term defines the amount that a solute can dissolve into a solution? A. solute level
B. solution level
C. solubility level
D. saturation level

Answers

The correct answer for the question that is being presented above is this one: "C. solubility level." The term defines the amount that a solute can dissolve into a solution is called the solubility level. The higher the solubility level, the faster it dissolves.

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

Answers

Answer:

Ionic

Explanation:

Step 1: Define

1s²2s¹ is Lithium (Li)

1s²2s²2p⁵ is Chlorine (Cl)

Step 2: RxN

2Li (s) + Cl₂ (g) → 2LiCl (s)

Step 3: Identify

LiCl is a metal and a non-metal bonded together. Therefore, it will be an ionic bond. The Lithium would transfer it's electron to Chlorine (since it wants a full outer shell 0f 8 and it currently as 7) and form a salt.

Compute 3.5×4.48697. Round the answer appropriately. Express your answer numerically using the proper number of significant figures.

Answers

16 because the actual answer is 15.704395 then u round the .7 because it greater than 5 making it 16

Final answer:

The product of 3.5 and 4.48697 is 15.705395, which rounds to 16 when using the appropriate number of significant figures.

Explanation:

To find the product of 3.5 and 4.48697, you would simply multiply the two numbers together. This results in 15.705395.

However, the least number of significant digits in the numbers given is two (in the number 3.5). Therefore, we will round our answer to two significant figures. 15.705395 rounds to 16 when rounding appropriately to two significant figures as we count from the first non-zero digit, which is 1, then to the next digit which is 5.

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In the "Méthode Champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. The reaction is the following. C6H12O6(aq) → 2 C2H5OH(aq) + 2 CO2(g) Fermentation of 754 mL of grape juice (density = 1.0 g/cm3) is allowed to take place in a bottle with a total volume of 840. mL until 13% by volume is ethanol (C2H5OH). Assuming that the CO2 is insoluble in H2O (actually a wrong assumption), what would be the pressure of CO2 inside the wine bottle at 21°C? (The density of ethanol is 0.79 g/cm3.) WebAssign will check your answer for the correct number of significant figures. atm

which element has the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8

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