Which symbol represents a salt?
O CaCl2
O C6H12O6
O C2H2
O 02

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:

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

nutrient enriched plankton i believe! :)

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: 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: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:

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:

A, Condensation

Explanation:

I got it correct :)

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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The number of sulfate ions : 2.2 x 10²³

Reaction

Al₂(SO₄)₃⇒2Al³⁺+3SO₄²⁻

mol Al₂(SO₄)₃(MW=342,15 g/mol) :

[tex]\tt \dfrac{41.65}{342.15}=0.122[/tex]

mol of sulfate ions (SO₄²⁻)

[tex]\tt 3\times 0.122=0.366[/tex]

1 mol = 6.02 x 10²³ particles (ions, molecules, atoms), so for 0.366 mol :

[tex]\tt 0.366\times 6.02\times 10^{23}=2.20\times 10^{23}[/tex]

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:

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]

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:

True

Explanation:because of the motion

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:

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:

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.

Looking at the absorption Spectra of cranberry juice and apple juice the color and part of the visible spectrum that are absorbed as well as how the colors that are not absorbed contributed to the the colors of the cranberry juice and apple juice are;

When the light actually hits on a surface,it is only a part of it that is reflected to the eyes whereas the rest of the spectrum is then absorbed by the object.

However,if the red wavelength is reflected,you will see the red color,but if all the spectrums are absorbed,you will see the black color,if then all the spectrums is reflected,you will see the white color.

When the light hits the surface, just a part will be reflected in the eyes of the person.

From the complete information, when an individual looks at the absorption spectra of cranberry juice and apple juice, just a part will be seen.

When the light hits the surface, there'll be a reflection in the eyes of the person as just a part will be reflected. The rest of the spectrum will be absorbed by the object.

Also, if the red wavelength is reflected, then one will see the red color. When all the spectrum is absorbed, one will see the black color. Lastly, when all the spectrum is reflected, one will see the white color.

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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:

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:

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:

Mass of chlorine = 47.22 g

Explanation:

Given data:

Mass of sodium = 30.5 g

Mass of chlorine= ?

Solution:

Chemical equation:

 2Na + Cl₂      →      2NaCl  

Number of moles of Na:

Number of moles = mass/molar mass

Number of moles = 30.5g/ 23 g/mol

Number of moles = 1.33 mol

Now we will compare the moles of Cl ₂ with Na from balance chemical equation.

                    Na            :              Cl ₂

                     2              :               1

                     1.33          :            1/2×1.33 = 0.665 mol

Mass of chlorine gas:

Mass = number of moles × molar mass

Mass = 0.665 mol × 71 g/mol

Mass = 47.22 g

Answer:

Cells are the basic structural and functional unit of life.

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:

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 .

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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