pleasee helpppp
i have posted this many times m=but no one has helped :(
will mark brainliest!! :)

Answer:

B. Sexual reproduction results in offspring that each have a unique set of genes.

Explanation:

New genetic variation arises in a species as a result of sexual reproduction which results in offspring having a unique set of genes.

Answer:

B

Explanation:

Answer:

See explanation

Explanation:

In the section A,B

C triple bond O has a higher bond energy. A triple bond is shorter and more difficult to break hence they have a higher bond energy.

For the same reason in the C,D section; C triple bond N has a higher bond energy.

In the next section, the higher the bond order the shorter the bond. Hence C triple bond C is the shortest in the A,B section while C triple bond O is the shortest in the C,D section. Both have a bond order of 3.

In the A,B section; I is larger than Br hence H-Br has the shortest bond length.

In the C,D section; Br is larger than Cl hence P-Cl has the shortest bond length.

Answer:

Gold is an element even when it is in a solution

Answer:

CO2 I believe

Explanation:

It doesn't have any hydrogen

Answer:

Explanation:

Given: 1 dietary Calorie = 1000 calories

           1 calorie = 4.184 Joules

But,

1 dietary Calorie = 1 Kcalorie

                           = 1000 x 4.184 Joules

                           = 4184 Joules

                           = 4.184 KJoules

1 dietary Calories contains 4.184 KJ of energy.

A bottle of Coca cola contains 42 Kcalories; thus,

1 Kcalorie = 1000 calories

                = 4.184 KJoules

Energy = 42 x 1 dietary Calories

            = 42 x 4.184 KJoules

            = 175.728 KJoules

Energy ≅ 176 KJ

So that;

In my bottle of coca cola, there are 176 KJ of energy.

Answer:

3.4g

Explanation:

Given parameters:

Mass of ethanol  = 2.911g

Unknown:

Mass of water vapor = ?

Solution:

To solve this problem, let us write the balanced reaction equation first;

             C₂H₅OH  + 3O₂  → 2CO₂  + 3H₂O

Now find the number of moles of ethanol;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

    Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol

  Number of moles  = [tex]\frac{2.911}{46}[/tex]   = 0.06mole

  So;

       1 mole of ethanol will produce 3 moles of water vapor

      0.06mole of ethanol will produce 0.06 x 3  = 0.19moles of water vapor

 Mass of water vapor  = number of moles x molar mass

   Molar mass of H₂O  = 2(1) + 16  = 18g/mol

  Mass of water vapor  = 0.19 x 18  = 3.4g

Answer: D

Explanation:  Physical science is the study of the inorganic world. That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.

Cadmium (Cd), Mercury (Hg), and Copernicium (Cn).

Answer:

B) heterotrophs

Explanation:

hetero meaning other or different from its own species

Answer:

Answer:

♡ hi fairy ♡

-- the answer is heterotrophs

~ madeline ✧･ﾟ: *✧･ *:･ﾟ✧*

Explanation:

160 grams of I-131 were in the original sample if the half-life is 8 days.

In a chemical reaction, the time taken for the concentration of that substance to become half of its initial value is called half-life. This term is used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay .

The amount left N after n half lives of a radioactive element with original amount N₀ is given as:

N= N₀ (1/2)ⁿ

Given, half life of Iodine-131 is 8 days

n= 40/8= 5

5= N₀ (1/2)⁵

N= 32 * 5

= 160 grams

Hence, the original amount amount of  I-131 will be 160 grams.

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Answer:

Im sorry i though this was a joke i don't know I'm sorry:

[tex]\huge\boxed{Buoyant Force}[/tex]

A body at rest in a fluid is acted upon by a force pushing upward called the buoyant force, which is equal to the weight of the fluid that the body displaces. If the body is completely submerged, the volume of fluid displaced is equal to the volume of the body. That is how we find the Volume of the Irregularly shaped objects.

Archemedes the GREAT GREEK PHYSICIST was in a real problem finding out the formula of how to find the volume of irregular object. After countless failures in finding it, once he was going to get a apparently "BUBBLE BATH", So when he got into the tub the water displaced and got out from the tub resulting in the splash of water. His MIND CLICKED that we could find the volume by submerging the irregular object into the measured water and then substract the displaced water from it. He ran NAKED out of the house because of the happiness saying EUREKA! EUREKA! which literally means "I have found it". Thus this law of Archemedes is also called EUREKA LAW. So to simply remember how to find volume of irregular object keep EUREKA in mind.

[tex]Best Regards,[/tex]

Answer:Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest. So the asnwer is helium

Explanation:

Answer:

Chemically combined and cannot be separated

Explanation:

1)A minimum of two atoms combine to form a molecule.

2)Atoms are combined via chemical reactions thus chemically combined. Sodium+Chlorine

e.g Na+Cl—>NaCl²

Answer:

a) layer 4

b) layer 1

Explanation:

Older the layer=older the fossils

Newer the layer=newer the fossilss

Answer:

Copper (atomic number 29)

Explanation:

Copper is a element that is malleable and a good conductor of heat and electricity.

Answer:

finely divided iron is used as catalyst in the manufacture of ammonia by haber's process

The cell membrane allows certain items into a cell and blocks others from entering, just like a security guard protects a real factory.

Answer:

b. diamond

Explanation:

Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.

Answer:

2457.6

Explanation:

I calculated the answer and got it right.

Answer:

B.

Explanation:

1 orbital is 4 half of 4 is 2.

Electrical energy is caused by moving particles that have a negative or positive charge. These charged particles are called electrons. The faster the electrons are moving, the more electrical energy they carry. Electrical energy commonly moves through a wire in an electrical circuit.

                                     [tex]\huge\boxed{Electrons.}[/tex]

Electrons are particles that move to create electricity. In other words, they are responsible for electric currents. Thus, the answer should be Electrons.

Answer:

1. V = 1.47L

Explanation:

1) Using PV = nRT

Where;

P = pressure (atm)

V = volume (L)

R = gas constant (0.0821 Latmk mol)

n = number of moles

T = temperature (K)

To get number of moles, we say mole = mass/molar mass

Molar Mass of C2H2 = 12(2) + 1(2)

= 24 + 2 = 26g/mol

mole = 3.86/26

mole = 0.148mol

T (K) = 28.5°C + 273.15

T(K) = 301.65K

PV = nRT

2.5 × V = 0.148 × 0.0821 × 301.65

2.5V = 3.665

V = 3.665/2.5

V = 1.466

V = 1.47L

R =

PV = nRT

P1 V1\ n1 T1 =P2 V2/ n2 T2

1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature

of 28.5 °C?

2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has

cooled?

Answer:

their outer electron shell is full

Explanation:

they are named noble because they are non-reactive

The noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.

Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.

Noble gases are defined as any of a class of extremely stable, very slow-reacting rare gases, such as helium, neon, argon, krypton, xenon, and typically radon. In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they generally react with anything. For this reason, they are also referred to as inert gases. The outer shell of the noble gas are completely filled.

Thus, the noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.

To learn more about electrons, refer to the link below:

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i believe its deposition

Answer:

d . a and b are correct

Explanation:

The law of superposition allows us to determine the age of rock layers and also that of the fossils within them.

The law of superposition states that "in an undeformed sequence of strata, the oldest rock layer is at the bottom and the youngest is on top".