If you have earned income, which of the following retirement devices must you contribute to, by law? A. IRA
B. Pension plan
C. Social security (FICA)
D. Vesting plan

Answers

Answer 1

Answer: C. SOCIAL SECURITY (FICA) PENNFOSTERS

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A sample of gas at 300 K has a volume of 2.0 liters. At what temperature will the volume decrease to 1.0 liter if the pressure is kept constant?

Answers

Answer : The temperature will be, 150 K

Explanation :

Charles' Law : This law states that volume of gas is directly proportional to the temperature of the gas at constant pressure and number of moles.

$V\propto T$ (At constant pressure and number of moles)

or,

$(V_1)/(T_1)=(V_2)/(T_2)$

where,

$V_1$ = initial volume of gas = 2.0 L

$V_2$ = final volume of gas = 1.0 L

$T_1$ = initial temperature of gas = 300 K

$T_2$ = final temperature of gas = ?

Now put all the given values in the above formula, we get the final temperature of gas.

$(2.0L)/(300K)=(1.0L)/(T_2)$

$T_2=150K$

Therefore, the temperature will be, 150 K

pv/t=c
Therefore

v/t=c
2/300=1/t2
t2=150K

How many valence electrons does carbon have

Answers

Answer:

Carbon has 4 valence electrons

Explanation:

The valence electrons are those found in the last energy level of the atom.

They are responsible for the interaction between atoms,

they can form bonds.

Let's see the electronic configuration of carbon.

The atomic number of C is 6 (Z=6)

$C= 1S^2 2S^2 2P^2$

To know the number of valence electrons that we have we count in the last energy level of the atom.

The last energy level of carbon is 2 and we 4 electrons is this level.

So carbon has 4 valence electrons.

Final answer:

Carbon, as an element from Group 14 of the periodic table, has four valence electrons. These electrons are the ones available for bonding and are located in its outermost shell.

Explanation:

Carbon belongs to Group 14 in the periodic table and has four valence electrons. These are the electrons that are available for bonding. Elements in Group 14 have four electrons in their outermost shell because the s and p sublevels can hold up to four electrons. For example, in the case of carbon, its electron configuration is 1s22s22p2 which clearly shows the four valence electrons in the outermost shell (the 2s and 2p orbitals).

Learn more about Valence Electrons here:

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What region of the atom contains most of the atoms mass?

Answers

Answer:

Nucleus

Explanation: it is the center of the atom, and contains protons and nuetrons

Describe the evidence of changes in organisms in the Cambrian Era that are reflected in the fossil record.

Answers

Answer:

Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla

Explanation:

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Final answer:

The Cambrian era saw significant changes in organisms reflected in the fossil record, including the emergence of complex multicellular life forms and the diversification of species. Fossils such as trilobites and brachiopods provide evidence of this biodiversity and adaptive radiation.

Explanation:

The Cambrian era is known for the rapid diversification of life forms, marked by the appearance of complex multicellular organisms. The fossil record from this era provides evidence of key evolutionary developments such as the emergence of hard-shelled animals, intricate body plans, and the colonization of different ecological niches. For example, the presence of trilobites, brachiopods, and archaeocyathids in the fossil record reflects the incredible biodiversity and adaptive radiation that occurred during the Cambrian.

Learn more about Cambrian Era here:

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Calculate the mass of water produced when 2.15 g of butane reacts with excess oxygen in the equation 2C4H10(g)+13O2(g)→10H2O(g)+8CO2(g)

Answers

molar mass :

H₂O = 18.0 g/mol

C₄H₁₀ = 58.0 g/mol

2 C₄H₁₀(g)+ 13 O₂(g) →10 H₂O(g)+ 8 CO₂(g)

2 x ( 58.0) g -------------- 10 x ( 18.0 ) g
2.15 g -------------------- mass of water

mass of water = 2.15 x 10 x 18.0 / 2 x 58.0

mass of water = 387 / 116

mass of water = 3.336 g

hope this helps!

Which element (Na or Cl) is more likely to steal an outer electron from the other?

Answers

Answer:

Cl is more likely to than Na

Explanation:

The question asks for the element more take up an electron from the other

The ability of an atom to take take or give electrons in a chemical reaction, depends on its electron affinity and ionization energy, respectively

Chlorine, Cl, has the highest electron affinity in the periodic table which makes it attract electrons more towards itself

Sodium, Na, has a low ionization energy (about 2/5 of that of chlorine) than chlorine, Cl, making sodium more readily able to give its valence electron in a reaction

Therefore, Cl is more likely to take up an outer electron from Na.

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The sum of the potential energy and the kinetic energy of an object is its thermal energy. True or false?

Uncontrolled hypertension can lead toA. heart attack. B. stroke. C. kidney damage. D. all of the above.

How many moles are represented by 250g of platinum?