Pls help me with this question: This diagram represents the process of?

A.selective breeding
B.natural selection
C.metamorphosis
D.germination

Answer:

B. The atom has two more electrons than an atom of oxygen.

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Oxygen has a total number of eight (8) electrons while neon has total number of ten (10) electrons. Therefore, an atom of oxygen is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon with an atomic number of 10.

This ultimately implies that, an [tex] O^{2-} [/tex] atom contains the same number of electrons as an atom of neon.

Hence, a neon atom has two more electrons than an atom of oxygen.

Additionally, Neon is used in lighting advertising displays.

Answer:

c

Explanation:

You can differentiate between calcite and halite without using any measuring equipment based on: C. Hardness.

A mineral can be defined as a form of naturally occurring, inorganic solid substance that is typically characterized by a crystal structure.

In Science, the properties that can be used to identify and differentiate two or more minerals include the following:

In conclusion, hardness is a mineral property that can be used to differentiate between calcite and halite without using any measuring equipment.

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Answer

Electrons live inside the nucleus and carry a neutral charge.

Explanation:

Answer:

Answer:

Charlotte La Bouff

Explanation:

"Lottie" if you will

Answer:

B

Explanation:

t= 300s has more XY than t=200s, which means that it continues to change

*i think

The system has been predicted to be not possible to reach equilibrium as  changing X and Y concentration. Thus, option B is correct.

Equilibrium has been described as the condition in the reaction mixture, when the concentration of the product and the reactant are equal.

The given reaction has been represented as:

[tex]\rm X+Y\rightarrow\;XY[/tex]

The given reaction has been represented as, with the increase in time, there has been the consumption of the reactant and the formation of product.

The concentration has been continuously changing with time. Thus, the determination of the equilibrium has been difficult with changing X and Y concentration.

Thus, option B is correct.

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Answer:

The molarity is 0.0174 [tex]\frac{moles}{liter}[/tex]

Explanation:

Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.

[tex]Molarity=\frac{number of moles of solute}{volume of solution}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, being the molar mass of compound Pb(C₂H₃O₂)₄ equal to 443.38 g / mol, then the following rule of three can be applied: if 443.38 grams are contained in 1 mol, 2.7*10⁻² grams in how many moles they are present?

[tex]amount of moles=\frac{2.7*10^{-2} grams*1 mol}{443.38 grams}[/tex]

amount of moles= 6.09*10⁻⁵ moles

Being 1,000 mL= 1 L, then 3.5 mL= 3.5*10⁻³ L

So:

[tex]Molarity=\frac{6.09*10^{-5} moles}{3.5*10^{-3} L}[/tex]

Solving:

Molarity=0.0174 [tex]\frac{moles}{liter}[/tex]

The molarity is 0.0174 [tex]\frac{moles}{liter}[/tex]

Answer:

Explanation:

f i did this in my class

Answer:

3 rd

Explanation:

yes answer is 3 you can go with it

Answer:0.025576559594663 mole.

Explanation:

Answer:

The present water by weight for the hydrate = 45.2%

Explanation:

From the given information;

The present water by weight = (weight of the water/ total weight of the hydrate) × 100

The present water by weight = (11.3/25) × 100%

The present water by weight = 0.452 × 100%

The present water by weight for the hydrate = 45.2%

Besides building teeth and bones, calcium also keeps your blood and muscles moving and helps your nerves send messages from your brain to the rest of your body. Your body can't make calcium, so you need to get it from food or supplements. While you're pregnant, try to get at least 1,000 mg of calcium every day.

Calcium is a vital mineral. Your body uses it to build strong bones and teeth. calcium is also needed for your heart and other muscles to function properly

Answer:

Alloy

Explanation:

Answer:

guhhh

Explanation:

Answer:

Biosphere

The Biosphere --contains all the planet's living things. This sphere includes all of the microorganisms, plants, and animals of Earth. Within the biosphere, living things form ecological communities based on the physical surroundings of an area.

Explanation:

Answer:

Biosphere

Explanation:The Biosphere --contains all the planet's living things. This sphere includes all of the microorganisms, plants, and animals of Earth. Within the biosphere, living things form ecological communities based on the physical surroundings of an area. hope this helps (:

Answer:

5.8125*10^-3

the moles in Fe2O3 are 0.93/(56*2 + 16*3) = 5.8125*10^-3

Answer:

i did this assignment today, so u and i might be classmates :3 answer is shown below in 'explanation.'

Explanation:

the roller coaster assignment: force: 160 newtons. distance: 40 m high. time: 10 sec. work: 6400. average speed: 4 km.

for the whale assignment: force: 800 newtons. Distance: 10 meters. time: 3.5 seconds. work: 8,000 J. Average speed: 2.85

for the car: force: 1400 newtons. Distance: 800 m. time: 40 minutes. work: 1,120,000. average speed: 20.

moving company: force: 600. Distance: 80 m. time: 50 min. work: 48,000. average speed: 1.6.

I hope this is correct, bc i got 100% !! :3

Answer: I just added this so you can give the other person brainly

Answer:

isopropyl alcohol

Explanation:

HOPE IT HELPS YOU

Answer:

all element are atom but all at all atom are element

Explanation:

because all atoms of an element are same whereas atom of different element are different

The model that represents the physical property of metals known as ductility can be seen in the image attached below.

Metals are substances that are good conductors of heat and electricity.

The term ductility is a characteristic of metal and it explains the ability of metals to be drawn into wire. it implies that metal materials can be hammered and beaten into tiny sheets of wires.

The model in the image attached below shows how gold which is metal is drawn into wires.

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A numerical subscript following a set of parentheses represents the number of the group or poly-atomic ion in parentheses are present in a chemical  formula.

As an example, calcium hydroxide is [tex]\bold { Ca(OH)_2 }[/tex] . The subscript (2) indicates that calcium hydroxide contains two hydroxide ions.

Therefore, A numerical subscript following a set of parentheses represents the number of the group or poly-atomic ion in parentheses are present in a chemical  formula.

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Answer: 89.7 L

Explanation:

89.6 volume, in liters, does 128 grams of O2 occupy at STP. Therefore, option A is correct.

A volume is simply the amount of space taken up by any three-dimensional solid. A cube, a cuboid, a cone, a cylinder, or a sphere are examples of solids. Volumes differ depending on the shape.

Every three-dimensional object requires some amount of space. The volume of this space is measured. Volume is defined as the space occupied by an object within the boundaries of three-dimensional space. It is also known as the object's capacity.

1 mole Oxygen has mass 32 grams

Mole of Oxygen in 128 g mass = 128 g / 32 g/mol

= 4.0 mol O2

At Standard temperature and pressure this has volume

= 4.0 mol × 22.4 L/mol

= 89.6 L

Thus, 89.6 volume, in liters, does 128 grams of O2 occupy at STP, option A is correct.

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Explanation:

solvent bc when you remove it it becomes more concentrate

Answer:

I will give up the electrons

Explanation:

Consider the following rules:

1. An atom loses electrons if its oxidation number is positive.

2. An atom gains electrons if its oxidation number is negative.

3. An atom neither gains nor loses electrons if its atomic number is zero.

As I have an oxidation number [tex]+2[/tex] that is oxidation number is positive, so, I will give up electrons.

Answer:

40 - 20 = 20

20/4 = 5m/s

The difference in velocity divided by the rate = acceleration.

Answer:

Three lines between the carbon atoms in the Lewis structure represent three covalent bonds. Each covalent bond is a shared pair of electrons, hence there are six electrons being shared between the carbon atoms in ethyne.

The number of electrons that are being shared between the two carbon atoms in the covalent compound ethyne is six.

Covalent bond are formed by the sharing of electrons between two atoms.

In ethyne molecule two carbon atoms are present and between two carbon atoms three covalent bonds are present. And each covalent bond is formed by the sharing of two electrons. So three covalent bonds are formed by the sharing of 6 electrons.

Hence in ethyne 6 electrons are being shared.

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