Which type of fossil evidence helps determine the evolutionary relationship between two hominid species?

Answers

Answer 1

Answer: Answer: skull size of each species

Over time, it is the size of the skull particulary that of the jaw bones, that can help determine the evolutionary relationship of two hominid species. It was believed that the jaws of hominids change as time passes by because the size of the brains changes too.

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Atoms A and X are fictional atoms. Suppose that the standard potential for the reduction of X^2+ is +0.51 V, and the standard potential for the reduction of A^2+ is -0.33. Find the standard potential for an electrochemical cell with the cell reaction that follows.

Which group tends to have the highest ionization energy? The lowest?a) Halogens; Alkaline earth metals
b) Alkali metals; Noble gases
c) Noble gases; Alkali metals

Answers

Final answer:

The group with the highest ionization energy is(option c) noble gases due to their full electron shell, making it difficult to remove an electron. The group with the lowest ionization energy is(option c) alkali metals because they have only one electron in their outermost shell, which can be easily removed.

Explanation:

The answer to the question is (c) Noble gases; Alkali metals. Ionization energy is the energy required to remove an electron from an atom or ion. A higher ionization energy means it is harder to remove an electron.

Noble gases have the highest ionization energies because they have a full electron shell, so they do not readily give up an electron. On the other hand, alkali metals have the lowest ionization energy, because they have only one electron in their outer shell, which is relatively easy to remove.

Learn more about Ionization Energy here:

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An acid-base indicator is used in what type of reaction?

Answers

Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases. you use them if you want to know if a solution is an acid or it it's a base

What is the empirical formula of a compound containing 24.56% potassium, 34.81% manganese, and 40.50% oxygen?

Answers

Assume a 100g sample to make things easier; so 24.56% of 100g is 24.56g, for example. The empirical formula is simply the ratio of the moles of each substance. So convert each to moles so that you can compare them:

24.56g K *(1 mol/39.10g)= .6281 mol K
34.81g Mn *(1mol/54.94)= .6336 mol Mn
40.50g O *(1mol/16.00g)= 2.531 mol O

Remember that we are trying to find the ratio between them. The easiest way to do that is to divide each by the smallest number:

.6281 mol K /.6281 mol = 1
.6336 mol Mn /.6281mol = 1.0
2.531 mol O /.6281 mol =~ 4.0

So you have a ratio of 1:1:4 (there is some degree of approximation that you have to make)
So the empirical formula is:
KMnO4

Please help 30 points and brainlyist!!!! All of the following are isotopes of hydrogen, except: A. 1/0 H
B. 1/1 H
C. 0/1 H
D. 2/1 H

Answers

My dear friend ✌ ✌

The isotopes of the hydrogen atom are-:

▶1 , 2 and 3

So,
According to your options,

➡Only C is wrong.

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When was Carbon discovered? (The element from the periodic table)

Answers

Carbon was discovered in 3750 BC

What mass of solute is needed to prepare each of the following solutions? a. 3.00 L of 0.125 M K2SO4 b. 550 mL of 0.015 M NaF c. 700 mL of 0.350 M C6H12O6

Answers

a.
M = 0.125 M
V = 3.0 L
M=n/V(L) ⇒ n = 0.125 mol/L *3.0L = 0.375 mol

MM of K2SO4

K2 = 2* 39 = 78 g/mol
S= 32 g/mol
O4 = 4*16 = 64 g/mol

MM = 78g/mol + 32g/mol + 64g/mol =174 g/mol

mass = n*MM = 0.375 mol*174 g/mol = 65.25 g

b.
M= 0.015 M
V = 0.55L

n = 0.015 mol/L * 0.55L = 0.00825 mol

MM NaF

Na: 23g/mol
F: 19 g/mol

MM = 23g/mol + 19g/mol = 42g/mol

mass = n * MM = 0.00825 mol * 42g/mol = 0.3465 g

c.

n = M*V(L) = 0.350 mol/L * 0,700L = 0.245 mol
MM = 6*12 g/mol + 12*1g/mol + 6*16g/mol = 180 g/mol

mass = n*MM = 0.245 mol * 180g/mol = 44.1 g

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