Recall that atoms gain or lose electrons to become ions. So, an ion has a different number of electrons than its corresponding neutral atom. Positive ions have lost electrons, and negative ions have gained electrons. The table includes the electron configuration of several ions. Complete the rows for magnesium and oxygen (oxide) ions by identifying the correct ion charge, electron configuration, and neutral atom with the same configuration as the ion. You may need to use online resources or the periodic table to determine the correct ion charges. Select the correct answer from each drop-down menu to complete the table.​

Answer:

A

Explanation:

The correct answer would be the availability of krill.

A limiting factor is a substance or condition whose presence/absence can prevent a population from reaching its potential. Limiting factors can be biotic (living) or abiotic (non-living). Biotic factor includes the presence of competitive organisms in a population while abiotic factor includes food.

In the case of the blue whale, its diet is krill. Hence, its survival is largely dependent on the availability of krill. Otherwise, the blue whale might starve. Therefore, the availability of krill is a limiting factor for the population of whales.

The correct option is A.

Answer:

A, Condensation

Explanation:

I got it correct :)

Answer:

the 18 columns are labeled “Group” Figure 2. Elements in the periodic table are ... differ dramatically in their chemical and physical properties, but some elements are ... The groups can also be referred to by the first element of the group.

Explanation:

Answer:

D. light energy nuclear energy chemical potential energy

Explanation:

Energy transformation that takes place in plants when they change sun solar energy into plant glucose, is :

Light energy (by sunlight) to nuclear energy , chemical potential energy (glucon energy in plant cell - used by plants to make food).

Answer:

Volume  = 722.1 L

Explanation:

Given data:

Mass of gas = 902.0 g

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Volume of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will calculate the number of moles of C₂H₄.

Number of moles = mass/molar mass

Number of moles = 902.0 g/ 28.05 g/mol

Number of moles = 32.2 mol

Volume of gas:

PV = nRT

1 atm ×V = 32.2 mol × 0.0821   atm.L/ mol.K  × 273.15 K

V = 722.1 atm.L/1 atm

V = 722.1 L

Answer:

The indroduction of lizards in this marshy habitat may lead to severe alterations of its own ecosystem. Since the lizards and frogs are both species who feed on small insects, the insect population might begin to decrease around the area. Furthermore, if insects have lessened in the marsh, that means food for the lizard as well as for the frog. In an extreme scenario, unless the two species adapt to these new conditions, their population may rapidly decrease.

Answer:

Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a  commensal-host  relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to  competition between lizards and frogs for food .

mol CO₂ = 9.6

mol N₂ = 4.8

mol O₂ = 0.8

mol H₂O = 8

Reaction

4C₃H₅O₉N₃ → 12CO₂ + 6N₂ + O₂ + 10H₂O

mol CO₂

[tex]\tt \dfrac{12}{4}\times 3.2=9.6[/tex]

mol N₂

[tex]\tt \dfrac{6}{4}\times 3.2=4.8[/tex]

mol O₂

[tex]\tt \dfrac{1}{4}\times 3.2=0.8[/tex]

mol H₂O

[tex]\tt \dfrac{10}{4}\times 3.2=8[/tex]

Answer:

1 is not correct ......

All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct. Therefore, option 1 is correct.

When an atom has the same number of electrons and protons, it has the same number of negative (electrons) and positive (protons) electric charges (the protons).

As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.

The sodium atom contains 11 electrons. As sodium atom loses one electron to form sodium ion, sodium ion has ten electrons. Only sodium atoms have a strong reaction with water, whereas sodium ions do not.

Thus, All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct, option 1 is correct.

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Answer:

d. n = 4, l = 2, m = 0

Explanation:

A d-orbital in the fourth energy level can only be represented by  n = 4, l = 2, m = 0.

n is the principal quantum number(n) which signifies the energy level, here it is 4;

l is the azimuthal quantum number or l which signifies the shape of the subshell, it takes a value of n - 1, 0,1,2 or 3

m is the magnetic quantum number(m) which can be -2, -1, 0, 1 , 2

So, the right and fitting solution is  n = 4, l = 2, m = 0

Answer:

A. relative humidity B. air temperature C. air pressure D. atmospheric

Explanation:

The sentences can be completed as follows; Humidity is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. Air temperature is a measure of how hot or cold the air is,  Air pressure is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.

Humidity refers to the amount of water vapor or moisture present in the air. Specifically, it is the measure of the amount of water vapor present in the air compared to the amount of water vapor the air can actually hold at a particular temperature and pressure.

It is often expressed as a percentage, known as relative humidity, which describes the amount of moisture in the air relative to the maximum amount it can hold at a given temperature.

The given sentences can be completed as :

Humidity is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. Air temperature is a measure of how hot or cold the air is,  Air pressure is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.

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Answer:

Elements

Explanation:

Each kind of atom is an element. Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.

Answer:

Elements

Explanation:

Elements such as those on the periodic table are unable to be broken down into simpler forms.

Mixtures (both homogenous and heterogenous) are made of multiple elements making it able to be physically broken down back to its original elements.

Compounds are also made up of multiple elements, however it must go through a chemical separation process in order for it to be broken down into its original elements.

Matter is a broad term of any substance. So it could both be a combination or a single element making it incorrect for this question.

Answer:

This question lacks options, the options are;

A. Absorption of heat

B. A chemical change

C. A physical change

D. Formation of a new compound

The answer is C. A physical change

Explanation:

A physical change is a type of change that does not involve the chemical composition of the substance(s) involved. Physical changes affect the form but not the chemical content of a substance. Examples of physical changes are freezing, change of state, boiling etc.

In this question, a liquid is cooled during an investigation causing it to solidify. The cooling of this liquid represents a PHYSICAL CHANGE because the liquid state of the substance is only changed to a solid state but does not involve changing the chemical composition of the substance.

A liquid is cooled during an investigation physical change causing it to solidify.

Physical change occurs whenever there is difference in the appearance of any object observed.

In the question it is given that during an investigation a liquid is cooled down which results in the solidification of that liquid. During that change state of material changes from liquid state to the solid state, which is an example of a physical change.

Hence, in the question physical change occurs.

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There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. If an element with no electrons to share belongs to noble gas family.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Noble gas is the group 18 elements whose octet is complete and they are not ready to give or take electrons from other element. They are very much stable on its own.

Therefore if an element has no electrons to share and is stable then that element belongs to group 18 or noble gas family.

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Answer:

3. Granite and Gneiss.

Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism. Banded gneisses called migmatites are composed of alternating light colored layers of granite or quartz feldspar and dark layers rich in biotite.

Granite is a purely natural stone that comes directly from stone quarries and is then cut into thin slabs, polished, and fabricated into countertops. So-called quartz countertops are engineered stone products that may contain a large percentage of natural quartz but may also include other minerals.

Answer:

As you begin your trip down the hill you increase your speed resulting in a transformation from potential energy to kinetic energy.

Explanation:

At the top of the mountain, you have potential energy. But as you start moving down the mountain, your speed increases and have a lot of kinetic energy.

nutrient enriched plankton i believe! :)

Answer: The number of bonds that an element can form is determined by the number of electrons in its valence shell. Similarly, the number of electrons in the valence shell also determines ion formation.

Explanation:

Explanation:

The different subatomic particles in an atom are the:

Protons and neutrons are located in the nucleus of an atom which is the tiny center of the atom.

Electrons orbits around the nucleus and fill the rest of the volume of atom.

Answer:

2 to 1

Explanation:

The reaction equation is given as:

    2KHCO₃  →   K₂CO₃  + CO₂  + H₂O

The conversion factor between the moles of KHCO₃ and  K₂CO₃ is 2 to 1.

From the balanced chemical equation, we find out that;

     2 moles of 2KHCO₃ will produce 1 mole of  K₂CO₃.

So given any mole of either of the reactant  or product, we can find the unknown.

Answer:

an acid

Explanation:

Hydrochloric acid or muriatic acid is a colorless inorganic chemical system with the formula HCl. Hydrochloric acid has a distinctive pungent smell. It is classified as strongly acidic and can attack the skin over a wide composition range, since the hydrogen chloride completely dissociates in an aqueous solution. Wikipedia

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:0.213 J/g°C

Explanation:

To calculate specific heat of the metal, the formula is used:

Q = m × c × ∆T

Where Q = amount of heat

m = mass

c = specific heat

∆T = change in temperature

Explanation:

Answer: repair and renew wounds effectively

~replacing lost cells, such as a shed skin cell

~allows for growth

~allows for reproduction

Explanation:

The cell cycle includes the various events in which a  cell matures by increasing length and shape, cell replicates its genome and prepare itself for cell division.

The cells divide and replace the old and damaged cells in the multicellular organisms. Multicellular organisms are those organisms which have more than one cell.

This also helps in replacing the lost cells and helps in removing the shedding the skin cell.

This process is also useful for cellular growth and reproduction.

Answer:

Cells are the basic structural and functional unit of life.

Answer:

True

Explanation:because of the motion

Answer:

The greenhouse effect

Explanation:

The greenhouse effect is a straightforward method that heats the Earth's exterior. When the Sun's rays touch the Earth's environment, some of it is bounced back to space and the rest is grasped and re-heated by greenhouse gases. The consumed energy heats the environment and the exterior of the Earth.