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Answer:

Option d, 1s2 2s2 2p6 3s2 3p6 4s2

Explanation:

Alkaline earth metals belong to group 2 of the periodic table. Elements belonging to group 2 are beryllium, magnesium, calcium, strontium and barium and radium.

Alkaline earth metals have 2 valence electrons and these two electrons are filled in outermost s sub shell.

General electronic configuration of alkaline earth metal: ns^2

In ionized state, number of electrons in s sub shell will not be 2.

Among the given, only 1s2 2s2 2p6 3s2 3p6 4s2, has 2 electrons in s sub shell. So, it an electronic configuration of neutral alkaline earth metal.

The correct answer to the question is Option D. 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Alkaline earth metals are metals belonging to the group 2 of the periodic table.

They have 2 valence electrons.

Now, we shall determine which of the option given above that has  valency of 2 electrons

1s² 2s¹

Valence electron shell = 2s¹

1s² 2s²2p²

Valence electron shell = 2s²2p²

Valence electron = 2 + 2

1s² 2s²2p⁶ 3s¹

Valence electron shell = 3s¹

1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron shell = 4s²

From the illustraton made above, we can see that only Option D has a valence electron of 2.

Therefore, the correct answer to the question is Option D. 1s² 2s²2p⁶ 3s²3p⁶ 4s²

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They can use the properties to test and come to some kind of conslusion about the object because in some way it's gotta correlate back to one of the different properties of matter.

If a decrease in temperature accompanies a reaction, Energy was absorbed.

So the forth option is correct option.

Hello!

To find the number of atoms in 2.822 moles of nickel, we need to multiply it by Avogadro's number. Avogadro's number is 6.02 x 10^23 atoms.

2.822 moles x (6.02 x 10^23) ≈ 1.698844 x 10^24

Therefore, there are about 1.70 x 10^24 atoms (according to the number of significant figures) in 2.822 moles of nickel.

Answer:- 1.8 L

Solution:- The given volume is 1838 mililiters and we are asked to convert it to liters. We know that:

[tex]1mL=(\frac{1}{1000})L[/tex]

Where, mL stands for mililiters and L stands for liters.

Let's make the set up using this conversion factor to convert the given mL to L.

[tex]1838mL(\frac{1L}{1000mL})[/tex]

= 1.838 L

They asks to round the answer to the nearest tenth. So, it becomes 1.8 L.

a physical property would be a. boiling poing

Answer: A) boiling point

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Boiling point is a physical property as it involves change of state.

Flammability is a chemical property as there is formation of new substances.

Reactivity is a chemical property as there is formation of new substances.

Toxicity  is a chemical property as there is formation of new substances.

1) Answer is: O and P.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Oxygen (O) has greater electronegativity than phosphorus (P), because of that oxygen is partially negative and phosporus is partially positive.

Polyatomic ion is for example a molecule that has been ionized by gaining or losing electrons.

Oxygen and phosphorus can form ion PO₄³⁻.

2) Answer is: Cs and I.

Cesium (Cs) and iodine form salt cesium iodide (CsI) with ionic bond.

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

Cesium (metal) lost one electron and form cation Cs⁺; iodine (nonmetal) gain one electron and form anion I⁻.

3) Answer is: KCl.

Potassium chloride is a salt with ionic bond.

Substances with ionic bond conduct an electric current in liquid and aqueous solutions, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

Dissociation of potassium chloride in water: KCl(aq) → K⁺(aq) + Cl⁻(aq).

4) Answer is: metal cation + nonmetal anion(–ide).

Name of this compound is calcium chloride.

Calcium chloride is a inorganic salt with ionic bonds between calcium and chlorine. It is a colorless crystalline solid at room temperature, highly soluble in water.

Calcium has oxidation number +2 and chlorine has oxidation number -2.

5) Answer is: AlCl₃.

Balanced chemical reaction: 2Al(s) + 3Cl₂(g) → 2AlCl₃(s).

Aluminium chloride is a salt with ionic bonds.

Aluminium (metal from group 13) has oxidation number +3 and chlorine (nonmetal from group 17) has oxidation number -1, chemical compound has neutral charge (+3 + 3 · (-1) = 0).

6) Answer is: carbon.

In molecule of methane (CH₄) all the atoms around the central element (carbon) are equivalent (four hydrogens) and it has a net dipole moment of 0 (vectors of dipole moments cancel each other, dipole moment is zero).

Methane (CH₄) is gaseous molecule with tetrahedrale structure, carbon is sp3 hybridized.

7) Answer is: Sodium chloride has a higher boiling point than sucrose.

Sodium chloride (NaCl) has ionic bonds and sucrose (C₁₂O₂₂O₁₁) has covalent bonds.

Sucrose or table sugar (C₁₂O₂₂O₁₁) composed of two monosaccharides. Monosaccharides glucose and fructose are linked with an ether bond between C1 on the glucosyl subunit and C2 on the fructosyl unit.

Boiling point of sodium chloride is 1413°C and sucrose decomposes at 186°C and form caramel.

8) Answer is:  It is a salt of three polyatomic ammonium ions and one polyatomic phosphate ion.

Polyatomic ammonium cation has charge of +1 and polyatomic phosphate anion has charge -3.

Ammounium ion is polyatomic because it is composed of one nitrogen and four hydrogen atoms.

Phospate anion is polyatomic because it is composed of one phosphorus and four oxygen atoms.

9) Answer is: S and O.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Oxygen (O) has greater electronegativity than sulfur (S), oxygen is partially negative and sulfur is partially positive.

Sulfur and oxygen can form, for example, SO₃²⁻ (sulfite anion) or SO₄²⁻ (sulfate anion).

10) Answer is: manganese(II) phosphate.

Manganese (II) phosphate (Mn₃(PO₄)₂) is an ionic salt.

Manganese has oxidation number +2 and phosphate has charge -3.

3 · (+2) + 2 · (-3) = 0; chemical compound has neutral charge.

Formula for manganese(III) phosphate  is MnPO₄.

Formula for manganese(I) phosphate  is Mn₃PO₄.

Explanation:

Immunoglobulin M is the first antibody produced on initial exposure to an antigen. It is also known as IgM.

It occurs as a primary response to the antigens against a particular baterium or virus. It is pentavalent in nature and has ten binding sites for antigens.

Therefore, it is concluded that when the body identifies a bacterium or a virus, it releases the antibody IgM.

Answer:

The first immunoglobulin to arrive is M, IgM

Explanation:

Immunoglobulins are the molecules that intervene in defense against microorganisms, foreign cells and against substances that can cause allergies. They are also known as antibodies. IgM is specific and is the first antibody that appears in primary infections, so its value and quantity is very important to diagnose an infection.

Size

As the charge increases (becomes more positive), the size decreases.

Also the number of protons and electrons matters in the atom itself. Li will have the smallest size because their are not that many electrons to repulse as say the Ca and K.

The largest member of that group is the one having the most number of electrons and is not an ion. In general the higher the charge, the smaller the radius.

K > K+ > Ca2+

Answer: A

Ionization Energy

As you go down the periodic table staying in the same column of the periodic table it takes LESS energy to break the outer shell electrons away. So the correct order for the column II elements is something like D.

Be is closest to the top of the periodic table and has the highest  ionization energy

Ca is the next closest to the top and has a medium size ionization energy

Sr has the lowest ionization energy.

Answer C is backwards.

Answers A B and E are all in the wrong order  of moving down Column II. The comment applies to staying in the same column and moving from top to bottom.

Polymers

A polymer is a complex combination of Carbon, Hydrogen and Oxygen (mainly). Other elements are possible but the majority is the listed ones.

DNA is a polymer

A glass bottle is made from SiO2 and is not a polymer

Ice crystals are actually water molecules. Those crystals are not polymers

Hair Proteins (like wool and silk) are made of polymers.

Rubber used for car tires are polymers.

You should count 3 items as your answer.

Answer:

AK

Explanation:

Answer:

1: C3H8

5: O2

3: CO2

4: H2O

Explanation:

The balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.  In other words, both mass and charge on the both side of the reaction are balanced.

A balanced equation indeed a chemical reaction equation in which the overall charge and the amount of atoms for every element inside the reaction are the same for both the products and reactants. In other words, both mass and charge on the both side of the reaction are balanced.

An imbalanced chemical equation describes the products and reactants of a chemical reaction however does not include the quantities needed to meet mass conservation. The balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.

Therefore, the balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.

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The volume of the cube in mL is 10.684 mL

We know that the volume of a cube with length of sides L is V = L³

Since the length of side of our cube is 2.20 cm, its volume V = L³ = (2.20 cm)³ = 10.648 cm³.

Since 1 dm³ = 1 liter and 1000 cm³ = 1 dm³, we convert the volume of the cube to dm³.

So, 10.684 cm³ = 10.684 cm³ × 1 dm³/1000 cm³ = 0.010684 dm³

Since 1 dm³ = 1 L,

0.010684 dm³ = 0.010684 L

We now convert this volume of the cube to milliliter(mL)

Since 1000 mL = 1 L.

0.010684 L = 0.010684 × 1 L = 0.010684 × 1000 mL = 10.684 mL

So, the volume of the cube in mL is 10.684 mL

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Answer: A.  NO increases the rate at which [tex]SO_3[/tex] molecules are formed.

Explanation: The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactants [tex](SO_2)[/tex] and [tex](O_2)[/tex] undergo collision and can cross the energy barrier and convert to products [tex](SO_3)[/tex]

Thus NO increases the rate at which [tex]SO_3[/tex] molecules are formed.

Answer:

The answer above is correct

A.  NO increases the rate at which  molecules are formed.

Explanation:

Answer:

answer in picture

Explanation:

Each factor listed is classified as either a variable or constant based on how it is treated in gas behavior experiments, which helps in understanding the ideal gas law.

When considering the lab procedure related to the behavior of gases, we can label each factor with 'V' for variable or 'C' for constant, based on the information provided about gas laws.

Early scientists studied the relationship between gas variables, holding some factors constant while varying others to observe the effects on gas behavior—this concept is crucial in understanding the ideal gas law and gas properties.

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Answer:

D. Crust, as its depth is less than 100 kilometers

Explanation:

The answer would be SOR.

A managed care plan is a type of insurance for health and there are three types: HMO; PPO; and POS.

HMO stands for Health Maintenance Organizations. This type of plan pays for the care provided within the network.

PPO stands for Preferred Provider Organizations. Typically, pays bigger if within the network, but also pays out even if care was provided outside the network.

POS stands for Point of Service lets you choose between HMO or PPO for every time you need health services/care.

Answer:

The answer would be SOR

Explanation:

The given equilibrium system has the number of reactant molecules are 4, and the number of product molecules are 2.

Equilibrium has been the condition that has been marked with the presence of equal number of product and reactant.

The given reaction has been:

[tex]\rm N_2\;+\;3\;H_2\;\leftrightharpoons\;2\;NH_3[/tex]

The number of atoms of each molecule on the product and the reactant side has been equal. The number of molecules has been the repeating unit for reactant and product.

The number of molecules on the reactant side has been the sum of hydrogen and nitrogen molecules. The number of hydrogen has been 3, while the number of nitrogen has been 1.

The total number of reactant molecule has been 4.

The number of product molecules, are 2 molecules of ammonia.

Thus, in the given equilibrium system, the number of reactant molecules are 4, and the number of product molecules are 2.

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Two physical changes is:

• Breaking

• Boiling

Two chemical changes could be:

• Molecules rearranging with other molecules to make new substance

• Bubbling/fizzing

why hello there

It depends of what kind of mineral you inhale if you inhale one of thease 9 you are in risk of dying

If my answer helped please mark me as brainliest thank you and have the best day ever!

The correct explanation of how air exerts pressure on us is:

The molecules in the air located above us are pulled down towards the Earth by gravity, causing a downward pressure on objects below.

Numerous molecules that make up air are constantly moving. These air molecules are drawn downward toward the Earth's surface by the gravity of the planet. Because of this, the air above us has a weight that presses down on everything below it, including our bodies. Atmospheric pressure is the name given to this occurrence.

The other possibilities are not accurate ways to explain how air presses on us. The Earth's natural force acting on our bodies does not immediately pressurize the air. Our bodies' internal pressure regulation, not the air's outward pressure, is what determines how much air is present outside and inside of us. Moreover, the strength of the chemical connections that connect air molecules to our body's  molecules is not directly relevant to how air pressure is exerted on us.

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Frozen water,cool water,warm water,water vapor.

Final answer:

The order from least to greatest kinetic energy of water in different states is frozen water (ice), cool water, warm water, and water vapor, in accordance with the kinetic molecular theory which relates temperature and phase of matter to kinetic energy.

Explanation:

To rank the different states of water according to their kinetic energy from least to greatest, we must understand that kinetic energy is related to the temperature and phase of matter. The kinetic molecular theory (KMT) explains that as the temperature increases, so does the kinetic energy of the molecules in a substance. Therefore, molecules in the solid phase (ice) have the least kinetic energy because they are at the lowest temperature, while molecules in the gaseous phase (water vapor) have the most kinetic energy due to the highest temperature.

Frozen water (Ice) - Solid state with the lowest kinetic energy.

Cool water - Higher kinetic energy than ice, as it is a liquid at a lower temperature.

Warm water - Even higher kinetic energy, as it is liquid at a higher temperature.

Water vapor - Gas state with the highest kinetic energy.

Thus, the correct order from least to greatest kinetic energy is: frozen water (ice), cool water, warm water, and water vapor.

a i took this test yesterday.

Answer: Organelles

Explanation:

The cell organelles are the basic structure that is present inside every cell which helps the cell to perform its survival activities and processes.

The various types of organelles in the cell helps in performing various functions. Such as the mitochondria helps in the conversion of carbohydrates into adenosine triphosphate.

The Golgi body in the cell helps in the sorting and modification of proteins. It helps in the transport the secretion of the cells after modifications.

Hence, the correct answer is Organelles.

The chemical formula is CF₂O.

Answer:

The chemical formula is [tex]CF_2O[/tex]

Explanation:

To determine how the molecule will be conformed you need to have in mind the valence number of each element present:

Now, as the only one positive, the C will be the central atom with a doble bond to the O and a single bond to each F.

In that way all atoms completed the octet and achive stability

Answer:

Climate

Explanation:

Weather is like the temperature over time

The elevation is height like the elevation on a mountain
Conditions like its rainy or cloudy

Climate is the certain weather over a period of time.

The average weather pattern of a region over a long period of time is known as climate. The changes in climate occurs due to the change in heat and light radiated from  sun.

Weather is the scientific term used to indicate the atmospheric condition of a region over a short period of time. The difference in weather depends on the landscape of the region.

The different weather condition occurs in different latitudes of earth due to the difference in the heat and light radiated to these regions. The tilted axis of earth makes the heat radiation impact differently in each poles of earth.

The average weather pattern of a region over a long period of time is known as climate. The changes in climate occurs due to the change in heat and light radiated from  sun. Climates of various ecosystems alters with respect to the peculiarities of the biosystems there.

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Hi Khal75,

Experiment: How to seperate iron fillings

Iron fillings is a substance that attracts to magnets.

Answer - Separated using a magnet; magnetism

If you move a magnet around different solids with the iron fillings in it, it wil attract the iron to be able to seperate it.

combustion is when you burn something in presence e of oxygen and the products will be mainly the CO2 and H2O

Answer: The given reaction represents a combustion reaction.

Explanation:

Decomposition reaction is defined as the chemical reaction in which a single substance breaks down into two or more simpler substances.

[tex]AB\rightarrow A+B[/tex]

Combination reaction is defined as the reaction in which two or more smaller substances combine to form a single large substance.

[tex]A+B\rightarrow AB[/tex]

Combustion reaction is defined as the reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water.

[tex]C_xH_y+O_2\rightarrow CO_2+H_2O[/tex]

A double displacement reaction is defined as the reaction in which exchange of ions takes place.

[tex]AB+CD\rightarrow AD+CB[/tex]

A single displacement reaction is defined as the reaction in which a more reactive element displaces a less reactive element from its chemical reaction.  The reactivity of metal is determined by a series known as reactivity series.

[tex]AB+C\rightarrow CB+A[/tex]

Metal C is more reactive than metal A.

For the given chemical reaction:

[tex]2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O[/tex]

This is considered as a combustion reaction because ethene reacts with oxygen gas to produce carbon dioxide and water molecule.

The mass number of an isotope is calculated by adding the number of protons and neutrons. In this case, an isotope of mercury has a mass number of 200 (80 protons + 120 neutrons).

The subject of your question is an isotope of mercury, which according to the information you provided, has 80 protons and 120 neutrons. In terms of nuclear structure, an isotope's mass number is the sum of its protons and neutrons. As such, if we add the number of protons (80) to the number of neutrons (120), we find that this isotope of mercury has a mass number of 200.

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I think I have done a question like this before and i'm pretty sure your answer would be the 2nd one 1s22s22p4. I'm not 100% sure but try it at least.

Answer:

electron configuration of carbon: 1s²2s²2p²

Explanation:

The electron configuration of atoms (or ions) is depicted based on the Aufbau principle according to which electrons are added to various orbitals such that the orbital with the lowest energy gets occupied first followed by the next higher orbital.

The energy ordering of orbitals from the lowest to the highest is:

1s < 2s < 2p < 3s < 3p < 4s  < 3d ....

s orbitals can accommodate a maximum of 2 electrons

p orbitals = 6 electrons

d orbitals = 10 electrons

Now, the atomic number of carbon = 6

Since it is neutral, the atomic number = number of electrons = 6

Based on the Aufbau principle the electron configuration of C would be

1s²2s²2p²

Answer:  0.5 kilograms

Explanation:

One kilogram is equal to a thousand grams.

Supposing x to be the number of kilograms equal to 527 grams, we can write it as:

1 kg = 1000 grams

x kg = 527 grams

To solve for x, we can simply divide 527 grams by 1000 thousand grams to get the answer.

x = 527 / 1000

x = 0.527

Rounding this value to the nearest tenth, it will become 0.5 kilograms.

Given data:

Mass in grams = 527 g

Mass in kilograms = ?

Solution:

1 kilogram=1,000 grams

1 gram = 1/1000 kilograms

527 gram = 1/1000 * 527

527 grams = 0.527 kilogram

Round of answer: 00.5 kg

You get 0.54 but the calculated answer is 0.572.

So without round off you are wrong.

With round off you are correct.

This polymer must D. be made of large molecules with repeating units.

A polymer consists of long chains of smaller repeating units called monomers.

For example, polyethylene consists of long chains of ethylene (CH₂=CH₂) units joined together end to end.

The formula for polyethylene is -CH₂CH₂-(CH₂CH₂)ₙ-CH₂CH₂-, where n is usually a number between 500 and 10 000.