I need helppppppppppp. Btw the question is “Select three populations shown in the prairie ecosystem.”

Answer:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. You will be building one type of sugar called glucose.

Explanation:

Answer:

The correct answer is - valid.

Explanation:

In this case, there is consistency in the results measures in the experiment which makes this method reliable. The consistency of a measure is referred to the reliability.

It is also given that the level of contamination of individual containers as per the average parameter of the contamination of large containers which makes this method not valid as the measurement method is how correctly it measures the true value of the parameter.

Thus, the correct answer is - method is reliable, but not valid.

Answer:

0.2mol/dm³

Explanation:

Given parameters:

Mass of Na₂CO₃   = 10.6g

Volume of solution  = 500mL

Unknown:

Molarity of solution  = ?

Solution:

The molarity of a solution can be determined using the expression below:

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

     Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

Molar mass of Na₂CO₃ = 2(23) + 12 + 3(16)  = 106g/mol

   Number of moles  = [tex]\frac{10.6}{106}[/tex]   = 0.1mol

   Convert mL to dm³;

        500mL will give 500 x 10⁻³dm³or 0.5dm³  

So;

Molarity  = [tex]\frac{0.1}{0.5}[/tex]    = 0.2mol/dm³

Answer:

juvn hgf   jb ujvi i  junk food sux

Explanation:

Answer:

Lithium oxide, Li₂O.

Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

[tex]M_2O+H_2 \rightarrow 2M+H_2O[/tex]

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

[tex]5.00gM_2O*\frac{1molM_2O}{(2x+16)gM_2O}*\frac{2molM}{1molM_2O}*\frac{xgM}{1molM} = 2.32gM[/tex]

Thus, we perform the operations in order to obtain:

[tex]\frac{10x}{2x+16}=2.32[/tex]

So we solve for x as shown below:

[tex]10x = 2.32(2x+16)\\\\10x = 4.64x+37.12\\\\x = \frac{37.12}{10-4.64}\\\\x= 6.93 g/mol[/tex]

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

Best regards!

Answer: A. [tex]7,+7[/tex]

Explanation:

Valence electrons are the number of electrons constituting the outermost shell of an atom. It is also defined as the electrons that take part in the formation of a chemical bond.

The atomic number of chlorine is 17 as it has 17 protons and the electronic configuration will be 2,8,7. Thus the electrons present in the outermost shell are 7 and hence the valence electrons are 7.

Effective nuclear charge is the net positive charge experienced by valence electrons. It is calculated by: Zeff = Z – S

where Z = atomic number , S = number of shielding electrons.

Thus for Chlorine , [tex]Z_{eff}=17-10=7[/tex]

The statement which is true about both groundwater and surface water is that the  groundwater and the surface water together form a drainage basin​.

Ground water is the type of water which is present below the surface of rock and between spaces in soil pores .Thirty percent of the available fresh water is present in the form of groundwater.

Groundwater is discharged from the surface naturally in the form of springs and seeps and can also exist in the form of oases or wetlands.It is used for various purposes like for agriculture, municipal and industrial uses. They are used by constructing wells .

The study of movement and distribution of ground water is called hydrogeology or even groundwater hydrology.It is a cheaper source of water and is less prone to pollution as compared to surface water.

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Answer

2.Write the metal first ( if I am right) as it is ionised

Answer:  

I think F

Explanation:

Answer:

The active sites on the initial amount of catalyst were fully saturated

Explanation:

A catalyst is a substance which alters the rate of a chemical reaction but largely remains unaltered at the end of the reaction. A catalyst has an active site which enables it to catalyze a reaction.

The active site provides the best possible orientation for reactant molecules to collide in order to form products.

When the active sites are not fully saturated with reactant molecules, more reactant molecules can bind and the reaction can proceed much faster. However, if the active sites of the catalysts are fully saturated, the reaction has maximum velocity and cannot go anymore faster.

Addition of more catalyst molecules can however make the reaction proceed faster as a it provides more active sites for reaction for the reactants.

Answer:

1. False 2.True3.True? Unsure

Explanation:

Solution

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

mol = mass : molar mass

mass = mol x molar mass

Molar mass = 58,6934 g/mol

Input the value :

mass = 0.0321 x 58,6934 g/mol

mass = 1.884 g

Answer:

Explanation:

4 Li(s) + 1 O2(g) -> 2 Li2O(s)

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is 4 Li(s) + 1 O[tex]_2[/tex](g) [tex]\rightarrow[/tex] 2 Li[tex]_2[/tex]O(s).

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

The other characteristic of balanced reaction is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas. The balanced equation for the given reaction is 4 Li(s) + 1 O[tex]_2[/tex](g) [tex]\rightarrow[/tex] 2 Li[tex]_2[/tex]O(s)

Therefore, the balanced equation is 4 Li(s) + 1 O[tex]_2[/tex](g) [tex]\rightarrow[/tex] 2 Li[tex]_2[/tex]O(s).

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Answer:

2.03

Explanation:

Let's assume we have 1 L of the solution:

With that information we can calculate the molality:

Keep in mind that this is only an estimate, as we used the kg of the solution and not of the solvent.

The molality of an ethylene glycol solution is 2.03 kg.

The moles of solute divided by the mass of solvent in kilograms is known as the molality of a solution.

Calculation of molality:

Given that, molarity is 2.07 M

Density is 1.02 g/ml

Step 1: To convert  the litre into grams, multiply the quantity by 1000

The weight of the solution is [tex]\bold{1.02 \;g/ml\; \times 1000 = 1020 g}[/tex]

Now, molality = moles of solute is divided by mass of solvent in kilograms.

[tex]\bold{Molality = 2.07 \times \dfrac{1020}{1000} = 2.03\; kg}[/tex]

Thus, the molality of the solution is 2.03 kg

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   molality = moles of solute / kg of solvent

   molality = 2.07 moles / (1020 ÷ 1000) = 2.03 m

Keep in mind that this is only an estimate, as we used the kg of the solution and not of the solvent.

Answer:

What is ^ for?

Explanation:

Moles of aluminum produced = 0.588

Given

30 g of Al2O3

Reaction

2Al203 ⇒ 4Al + 302

Required

moles of aluminum

Solution

mol Al2O3 :

= mass : MW

= 30 : 101,96 g/mol

= 0.294

From the equation, mol Aluminum :

= 4/2 x mol Al2O3

= 4/2 x 0.294

= 0.588

Answer: see below

Explanation:

Mg burning in air gives MgO and a smaller amount of Mg3N2

2Mg+O2=2MgO. 2*24.3+32=2*40.3

3Mg+N2=Mg3N2

Ignoring the nitride, MgO loss of mass during the reaction can be ascribed to

(1) relativistic loss as energy (too small to be measurable)

(2) During the reaction, which is strongly exothermic, a fraction f the material is blown off as tiny particles which adhere to the vessel.

Answer:

Explanation:

a ) ΔH_fusion of acetic acid is 11.45 kJ / mol . It means 11.45 kJ of heat will be released when 1 mole of acetic acid will  freeze . During this process temperature of acetic acid will be constant .

Temperature of acetic acid  T = 16.6⁰C = 273 + 16.6 K = 289.6 K .

By definition change in entropy

ΔS = dQ / T

= dH / T

As temperature remains constant during withdrawal of heat

ΔS = ΔH / T

T = 289.6 K .

ΔH = - 11.45kJ

ΔS = - 11.45kJ / 289.6

= - 11450 / 289.6

= - 39.53 J

It will be negative as heat is released by acetic acid .

b )

Heat amounting ΔH will be absorbed by water bath so its entropy will be increased . As water bath is very large , temperature of bath also will remain constant at 289.6 K .

Increase in entropy of water bath =

ΔS = ΔH / T

T = 289.6 K .

ΔH =  11.45kJ

ΔS =  11.45kJ / 289.6

=  11450 / 289.6

=  39.53 J

c )

consider that the water bath and acetic acid are the same system : --

Total change in the heat content of the system

= 289.6 - 289.6 = 0

So for the whole system

ΔQ =ΔH = 0

Change in entropy is zero .

Δ G = ΔH - TΔS

= ΔH - ΔH = 0

ΔG = 0

Change in entropy is zero .

Answer:

The correct answer is - option D.  the boiling point of solution A will be lower than the boiling point of solution B

Explanation:

Colligative properties such as a decrease in the freezing point of the solution, increase in the boiling point of substance, decrease in Lowering of vapor pressure, and other properties depend upon the number of molecules only.

In the given solution the equal amount of two solutions are mixed that is 50 grams however due to the difference in the molecular mass so the atoms present in both solution A and B will be different. It is known that the number of atoms of a substance is inversely proportional to the molecular mass of the particular substance.

As it is given that Solution B has a low molecular mass which means it has a high number of atoms that means its boiling point will be higher than solution A.

Answer: 0.68 mole

Explanation:

1 mole (of any atom/molecule) = 6.02214076*10^23

0.683 moles are equal to 4.11x10²³ molecules of carbon dioxide.

A mole is a unit of measurement in the International System of Units (SI) used to express an amount of a substance.

One mole is defined as the amount of a substance that contains as many elementary entities as there are atoms in 12 grams of pure carbon-12.

This number is known as Avogadro's number and is approximately 6.023 x 10²³.

Given:

For the number of moles of carbon dioxide in 4.11x10^23 molecules Avogadro's number = 6.023x10²³ particles per mole.

Therefore, the number of moles of carbon dioxide can be calculated as:

moles = number of particles / Avogadro's number

moles = 4.11x10²³ / 6.022x10²³

moles = 0.683 moles

Thus, 4.11x10²³ molecules of carbon dioxide are equal to 0.683 moles of carbon dioxide.

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Answer: We see constellations at different times of the year - spring, summer, fall, & winter. This occurs because the Earth is orbiting the Sun.

Explanation:

Answer:

3.6 moles

Explanation:

5.0moles produce 44g/x will produce 32g the answer is a3.6moles

Answer:

Glucose = C6H12O6

molecular mass = 6(12) + 12(1) + 6(16)

= 72 + 12 + 96

= 180 g

Explanation:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. ... Glucose is produced during photosynthesis and acts as the fuel for many organisms.

Answer:

0.25 moles

Explanation:

The molar mass of NaOH is 40 g/mol.  

[tex]\frac{10g}{40g/mol}[/tex]  This equals 0.25 moles

Answer:

iron and nickel (liquid metal )

Explanation:

The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. The outer core is responsible for Earth’s magnetic field. As Earth spins on its axis, the iron inside the liquid outer core moves around

Answer:

The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances.

Explanation:

b = 0;

this (x, y);

this(0, 0);

x = a;

y = b;

a =x

This above solution is just according to the public boolean equals(Point p) { return (x == p.x && y == p.y ); and public void equals(Point p) { System.out.println(x == p.x && y == p.y);}

An abstract class contains a pure virtual function. Pure virtual class cannot be instantiated but it can be subclassed and the subclass can provide an implementation of the function.

A virtual function declaration in the class is preceded by the virtual keyword. For example, virtual void print();

A pure virtual function declaration is followed by '=0;'

public: virtual void print()=0;

The main method header is written as public static void main(String[] args). A main method is something that is required in Java. You must have at least one class with a method named main. In Java, main is a static method, which means that it is part of its class but not parts of objects.

Therefore, This above solution is just according to the public boolean equals(Point p) { return (x == p.x && y == p.y ); and public void equals(Point p) { System.out.println(x == p.x && y == p.y);}

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