Complex molecules made from amino acids are called -------

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the balanced equation is:

Al2O3 + 6HCl -> 2AlCl3+3H2O

The correct answer is the atomic radius increase because of the higher number of occupied energy levels.  

Atomic radius increases when going down a group. The valence electrons hold the higher levels because of the enhancing quantum number (n). As a consequence, the valence electrons get further away from the nucleus with the increase in n. The electron shielding inhibits these outer electrons from getting fascinated towards the nucleus. Therefore, they are held, and the resulting atomic radius is greater.  

Answer:

they increase, because of the higher number of occupied energy levels

Explanation:

The chemical equation [tex]2Mg + O_{2} = 2MgO[/tex] reflects the principle of conservation of mass, showing an equal number of atoms for each element on both sides of the equation, thus balancing it.

The balance of the chemical equation [tex]2Mg + O_{2} = 2MgO[/tex] shows the principle of conservation of mass in chemistry. This principle states that the quantity of matter does not change in a chemical reaction.

Here, we have 2 atoms of magnesium (Mg) reacting with 1 molecule of oxygen ([tex]O_{2}[/tex]) to form 2 molecules of magnesium oxide (MgO). If you count the number of atoms of each element on both sides of the equation, you can see the balance: 2 magnesium atoms and 2 oxygen atoms on both sides.

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The given equation 2Mg + O₂ = 2MgO is already balanced, as there are equal number of each type of atom on the reactants and the product side.

To balance the chemical equation 2Mg + O₂ = 2MgO, we need to ensure that the number of molecules or atoms for each element on the reactant side (left) is the same as on the product side (right). This is in accordance with the Law of Conservation of Mass which states that matter cannot be created or destroyed. In this particular equation, we have 2 molecules of Magnesium (Mg) and one molecule of Oxygen (O₂) combining to give 2 molecules of Magnesium Oxide (MgO). If we inspect the equation, we'll see it's already balanced because the number of Mg and O atoms are same on both sides.

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Answer: A The molten mixture of rock-forming substances, gases, and water from the mantle..

Explanation:

Molecules or atoms. One of those. although atoms make up everything so i would go with atoms.

Answer:

Mixtures

Explanation:

The air,soil,and most foods and beverages are example of Mixtures. Mixtures are a combination of two or more substances into a single substance. Air is a mixture of gases, soil is mixture of elements, most foods are also mixtures.

The mixture can be both homogeneous or heterogeneous. A homogeneous mixture has a uniform appearance throughout and uniform composition as well. Whereas, a heterogeneous mixture neither has uniform composition nor it has uniform appearance.

Answer: [tex]NH_3[/tex]

Explanation:

a) [tex]H_2[/tex]: This  is a non polar covalent compound which are held by weak vanderwaal forces of attraction.

b) [tex]SO_2[/tex]: This  is a covalent compound which is polar due to the presence of lone pair of electrons and are held by dipole-dipole forces of attraction.

c) [tex]NH_3[/tex]: These are joined by a special type of dipole dipole attraction called as hydrogen bond. It forms between electronegative nitrogen atom and hydrogen atom and is the strongest interaction.

d) [tex]CF_4[/tex]: This  is a covalent compound and is non polar which are held by weak vanderwaal forces of attraction.

e)  [tex]BCl_3[/tex]: This  is a covalent compound and is non polar which are held by weak vander waal forces of attraction.

NH3 (Ammonia) experiences dipole-dipole forces as its strongest IMF due to its polar nature and the uneven distribution of electron density within the molecule.

The student's question asks to identify which molecule experiences dipole-dipole forces as its strongest intermolecular force (IMF). Dipole-dipole forces occur in polar molecules where there is an uneven distribution of electron density that creates dipoles, meaning one end of the molecule is slightly positive while the other end is slightly negative. Given the list of molecules, NH3 (Ammonia) experiences dipole-dipole forces as its strongest IMF because it is a polar molecule with a trigonal pyramidal structure, leading to a net dipole moment. Ammonia has a nitrogen atom with a lone pair that causes the molecule to be asymmetrical and polar, resulting in dipole-dipole attraction between molecules.

LiCi is an ionic compound, and ionic compounds are considered polar.

Rubidium is a alkali metal.

Answer:

Rb is an alkali metal.

Explanation:

The elements characterized by having a single electron in its outermost orbital (s) are called alkali metals or simply alkaline metals.

Due to the presence of this electron, they are chemically very reactive because they have a tendency to lose this electron. In other words, their high reactivity is due to the fact that they form chemical bonds with many types of substances and elements and do so easily. This is due to its high electronegativity.

Like all metals, they are very good thermal and electrical conductors. But in comparison, alkali metals are soft and have a low melting point due to their metallic bond. This link is quite weak because it is the external electrons that are responsible for the bond and in these metals there is only one electron per atom.

The alkali metals are located in group 1 of the periodic table and are: lithium (Li), sodium(Na), potassium(K), rubidium(Rb), cesium(Cs) and francium(Fr).

Answer: Order of the elements from most reactive to least reactive is:

Mg >  Zn > Fe > H > Cu

Explanation: Reactivity of the elements is the tendency of the elements to loose or gain electrons with ease.

As, all the given elements are metals, so the metals which will loose electrons easily will be more reactive. To study the reactivity of metals, we use reactivity series.

The metals which are more reactive are placed on the top of the reactivity series and which are less reactive are placed at the bottom.

Hence, the order of the elements from most reactive to least reactive is:

Mg >  Zn > Fe > H > Cu

Reactivity series is attached below.

Answer:

magnesium

Zinc

Iron

hydrogen

copper

Explanation:

Just took the course activity

it is making a new form so the density would be the same because water becoming into ice a solid are the same thing.

when a solid is cooled, its molecules slow down n vibrate less. usually its volume will decrease. as the mass remains constant and density = mass/volume, density will decrease.

Answer : The correct options are, stir the water, crush the salt and heat the water.

Explanation :

As we know that the increase or decrease of the rate depends on many factors which are, temperature, surface area, etc.

Stir the water : By this action the rate increases because when we are stirring the water, the some amount of energy is released that means the temperature of the solution increases. Thus the salt dissolves easily in water by stirring.

Crush the salt : By this action the rate increases because the surface area of solute (salt) increased by the crushing. So, the salt will be dissolved easily in water.

Heat the water : By this action the rate increases because when we are heating the water the temperature of the water increases. As the temperature increases, some empty voids created in the water molecule. Thus, the more salt will be dissolved in water.

But by the use of less water and cool the salt action, the rate decreases.

Hence, the correct options are, stir the water, crush the salt and heat the water.

Answer: The answer is B: Crush The Salt.

The answer is; Relative dating

This type of dating is not concerned with determining the absolute age of rock. It compares between rock layer and determines which is younger or older in comparison. Therefore relative dating is significant in arranging geologic events based on the stratigraphy of rock layers.  

Answer: Relative dating

Explanation:

Relative dating is a technique of identifying the age of the material whether fossil or rocks by comparing them with the surrounding materials. This method takes into consideration the order of the geological events took place on earth. This can be done by stratigraphy. In stratigraphy the layers of the rocks and sediments are compared to determine the age of the object (fossil, rock). This method does not help in determining the exact or absolute age of the object.

Answer: This is a mixture.

Explanation:

A solution consists of solute (which can be solid, liquid or gas) mixed in a given amount of solvent.

A mixture is a combination of two or more substances which are not present in a definite proportion.

We are given two solids: copper and silver.

As, they are not present in definite proportion hence, they are considered as mixtures.

The percentage composition by mass of carbon in ethanoic acid is 40%

Answer:

40.00 %  

Step-by-step explanation:

Let's rewrite the formula of ethanoic acid as C₂H₄O₂.

The masses of each element are:

2C = 2 × 12.01  =  24.02   u

4H = 4 × 1.008 =    4.032 u

2O = 2 × 16.00 = 32.00   u

            TOTAL = 60.05   u

=====

% C = 24.02/60.05 × 100

% C = 0.400 × 100

% C = 40.00 %

Answer: a) [tex]\frac{28gN}{80gNH_4NO_ 3}\times 100\%[/tex]

Explanation: Mass percentage is defined as the ratio of the mass of the particular element to the total mass of the substance multiplied by 100.

[tex]{\text{mass percentage}=\frac{\text{mass of the element}}{\text{Total mass}}\times {100}[/tex]

mass of nitrogen[2 atoms of N] = 28 g

Total mass of [tex]NH_4NO_ 3=2\times {\text {Mass of nitrogen}}+4\times {\text {mass of hydrogen}}+3\times {\text {mass of oxygen}}[/tex]

[tex]=2\times 14+4\times 1 +3\times 16=80 g[/tex]

[tex]{\text{mass percentage}=\frac{28}{80}\times {100}\%[/tex]

The correct percent by mass of nitrogen in NH4NO3 is given by the expression 28 g N / 80 g NH4NO3 * 100%.

The expression that represents the percent by mass of nitrogen in NH4NO3 is determined by dividing the total mass of nitrogen in the compound by the total mass of the compound and then multiplying by 100%. Nitrogen has a molar mass of 14 g/mol, and there are two nitrogen atoms in NH4NO3. So, the total mass of nitrogen is 14 g/mol x 2 = 28 g/mol. Meanwhile, the molar mass of NH4NO3 is 80 g/mol. Therefore, the correct expression is 28 g N / 80 g NH4NO3 * 100%, or option (a).

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The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99%)

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Answer: Option (D) is the correct answer.

Explanation:

An element is defined as a substance that contains atoms of one type.

For example, a piece of sodium metal will contain only atoms of sodium.

Therefore, it is a pure substance. Whereas a compound is a substance that consists of two or more different atoms in similar composition.

For example, [tex]CaCl_{2}[/tex] is a compound.

When elements change into compounds then they tend to change their chemical properties.

Hence, we can conclude that the statement they can only be separated by chemical methods, is true about the elements present in a pure substance.

 The  electronegativity   of fluorine  compare  to the  electronegativity   of oxygen and chlorine as below

Fluorine  has the highest electronegativity   than oxygen  and  chlorine.

  Explanation

 Generally  the  electronegativity    increase   across the period ( from the left to the right)  and  decreases down  the group.

Answer:

Fluorine is a smaller atom so when it forms a covalent bond, the shared electrons are closer to the nucleus and there is less shielding, electronegativity of oxygen is greater.

CdCl2+2NH4NO3

It is substitution reaction

Cd is metal with 2+ which connect with Cl(-)

NO3 with NH4 form salt

Answer:

Cd(NO₃)₂ + 2NH₄Cl → CdCl₂ + 2NH₄NO₃

Explanation:

The reaction given is a double replacement reaction, which means that the reactants will dissociate and the ions will be changed between them. So, let's identify the ions.

At Cd(NO₃)₂, the metal Cd has cation Cd⁺², and the anion is NO₃⁻ (the number of ions is changed and the cation is the first to appear in the formula). At NH₄Cl, the cation is NH₄⁺ and the anion is Cl⁻, so the products are CdCl₂ and NH₄NO₃ (the cation comes first, and the charges are replaced between them).

So, the reacion will be:

Cd(NO₃)₂ + NH₄Cl → CdCl₂ + NH₄NO₃

To balance the equation, all the elements must have the same number on both sides, thus we need to multiply NH₄Cl and NH₄NO₃ by 2:

Cd(NO₃)₂ + 2NH₄Cl → CdCl₂ + 2NH₄NO₃

The original volume of the balloon is approximately 29 L.

To calculate the original volume of the helium-filled balloon, we can use the combined gas law equation: PV/T = PV/T. Let's assume the unknown original volume as V1. Conversion of the temperatures from Celsius to Kelvin gives us T1 = 27 + 273 = 300K and T2 = -14 + 273 = 259K. Plugging the given values into the equation, we have (201 kPa)(59.3 m3)/300K = (2.5 kPa)(V1)/259K. Solving for V1, we find the original volume of the balloon to be approximately 0.029 m3 or 29 L.

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To solve for the original volume of the balloon, we can use the Ideal Gas Law. After converting the temperatures to Kelvin, we can rearrange the formula of the Ideal Gas Law to solve for the original volume. Doing this, we find that the original volume is approximately 1.73 cubic meters.

To solve this physics question, we need to use the Ideal Gas Law that states PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. In this case, we assume that the number of moles doesn’t change and the R is a constant. Therefore, we can simplify the law to the formula P1V1/T1=P2V2/T2 to find the original volume of the balloon.

Firstly, you need to convert the temperatures from Celsius to Kelvin by adding 273.15. That gives us 300.15K for 27°C and 259.15K for -14°C. The initial pressure (P1) is 201 kPa, the final pressure (P2) is 2.5 kPa, and the final volume (V2) is 59.3 m3.

So applying the equation P1V1/T1 = P2V2/T2, we can solve for V1, the original volume:
V1 = (P2*V2*T1)/(P1*T2) = (2.5 kPa*59.3 m3*300.15K)/(201kPa*259.15K)

This gives us the original volume as V1 = 1.73 m3.

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Answer : The pressure of the gas is, 14.925 atm

Solution :

using ideal gas equation,

[tex]PV=nRT[/tex]

where,

n = number of moles of gas  = 0.3 mole

P = pressure of the gas = ?

T = temperature of the gas = [tex]30^oC=273+30=303K[/tex]

R = gas constant = 0.0821 Latm/moleK

V = volume of the gas = 0.5 L

Now put all the given values in the above equation, we get the pressure of the gas.

[tex]P\times (0.5L)=(0.3mole)\times (0.0821L.atm/mole.K)\times (303K)[/tex]

[tex]P=14.925atm[/tex]

Therefore, the pressure of the gas is, 14.925 atm

time is usually on the x axis while position is on the y axis>

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Answer:

On a position-versus-time graph, along the x-axis (option b) is time usually shown.

Explanation:

One way to describe and study the movements is by means of graphs that represent distance-time (distance as a function of time), speed-time (speed as a function of time) and acceleration-time (acceleration as a function of time).

Then, as the displacements are made while time passes, the description of the movement is facilitated by making a graph of position versus time. In the vertical axis the positions that the body occupies are usually represented and in the horizontal axis the time. Similarly, velocity or acceleration can be represented versus time, where the horizontal axis is time and the vertical axis is velocity or acceleration.

Taking into account that the horizontal axis belongs to the x axis and the vertical axis to the y axis:

On a position-versus-time graph, along the x-axis (option b) is time usually shown.

your answer should be

A. the number of organisms of a species per unit area

Brainliest?

Answer: Option (A) is the correct answer.

Explanation:

Usually, density is defined as mass present in per unit volume.

Mathematically,         Density = [tex]\frac{mass}{volume}[/tex]

Since density is directly proportional to mass so, more is the mass of an object more will be its density.

Similarly, population in terms of density is the number of organisms of a species per unit area.

Thus, we can conclude that out of the given options the number of organisms of a species per unit area MOST closely defines population density.

A. mechanical energy to thermal energy

Final answer:

Utensils made of metal are typically homogeneous mixtures, while utensils made of plastic can be heterogeneous mixtures.

Explanation:

A utensil is not a substance but an object that is used to prepare or eat food. However, if you are referring to the materials that utensils are made of, such as metal or plastic, then they can be considered as mixtures. Utensils made of metal, for example, are typically a mixture of different metals, such as stainless steel or aluminum alloy. These metal mixtures can be considered as homogeneous mixtures because their composition is uniform throughout. On the other hand, utensils made of plastic can be considered as heterogeneous mixtures because they can have different additives and fillers mixed in with the plastic polymer.

Answer:

+ 7.

Explanation:

We have general rules to assign the oxidation numbers:

Rule 1: The oxidation number of an element alone in its free (uncombined) state is zero.

For example, Al(s) or Zn(s).

This is also true for elements found in nature as diatomic (two-atom) elements  as: H₂, O₂, Cl₂, or I₂.

and also for sulfur, found as: S₈.

Rule 2: The oxidation number of a monatomic (one-atom) ion is the same as the charge on the ion,

For example:  Na⁺ = +1, S⁻² = -2.

Rule 3: The sum of all oxidation numbers in a neutral compound is zero. The sum of all oxidation numbers in a polyatomic (many-atom) ion is equal to the charge on the ion.

Rule 4: The oxidation number of an alkali metal (group IA) in a compound is +1; the oxidation number of an alkaline earth metal (group IIA) in a compound is +2.

Rule 5: The oxidation number of oxygen in a compound is usually –2.

If, however, the oxygen is in a class of compounds called peroxides.

(for example, hydrogen peroxide), then the oxygen has an oxidation number of –1. If the oxygen is bonded to fluorine, the number is +1.

So, for our problem Ca(MnO₄)₂:

∴ oxidation no. of Ca + 2[(oxidation no. of Mn) + 4(oxidation no. of O) = 0.

(+2) + 2[(oxidation no. of Mn) + (- 8)] = 0.

2[(oxidation no. of Mn) + (- 8)] = - 2.

[(oxidation no. of Mn) + (- 8)] = -1.

∴ (oxidation no. of Mn) = - 1 + 8 = + 7.

+7 is the oxidation number of manganese atom (Mn) in Ca(MnO₄)₂.

Oxidation number of any substance will tell about the import and export number of electrons from that substance.

Given compound is Ca(MnO₄)₂, this is a neutral compound means no charge is present on the compound. Oxidation number of Calcium (Ca) is +2, oxidation number of oxygen atom (O) is -2 and let the oxidation number of manganese (Mn) be x.

Total sum of the oxidation number of all atoms equals to the whole charge of the compound and calculation for oxidation number will be calculated as:

+2 + 2[x + 4(-2)] = 0

2 + 2x - 16 = 0

2x = 16 - 2

2x = 14

x = 7

Hence, +7 is the oxidation number.

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cohesion is the "stickiness" that water molecules have for each other and for other substances.

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The subshell thats likely to be filled is s subshell  

after the rest of the subshells at a particular energy level.

1. p

2. f  

3.d

4.s

Answer:

2.f

Explanation:

At a particular energy level, say energy level 4. So lets compare subshells within the particular  shell or energy level. Comparing 4s, 4p, 4d and 4f. Subshell s has the lowest energy and subshell f has the highest energy. So 4s orbital will be filled first, followed by 4p, 4d and 4f. This is in accrdance to Aufbau principle.

Therefore the f subshell is likely to be filled after the rest of the sub shells at a particular energy level are filled.