On the present Periodic table of the elements, the elements are arranged according to increasing what?

1st figure

answer

c)12

2nd

answer

c)28

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[tex]4.4\; {\rm g}[/tex].

Refer to a modern periodic table for relative atomic mass:

Formula of copper (II) chloride: CuCl₂.

Formula mass of copper (II) chloride:

63.546 + 2 × 35.45 = [tex]134.446\; {\rm g \cdot mol^{-1}}[/tex].

How many [tex]{\rm mol}[/tex] of formula units in 8.3 grams of CuCl₂?

[tex](8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^{-1}}) \approx 0.0617\; {\rm mol}[/tex]

Note the subscript "2" in the formula CuCl₂. There are [tex]2\; {\rm mol}[/tex] of chloride ions in every [tex]1\; {\rm mol}[/tex] formula unit of CuCl₂.

There would be [tex]2 \times 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions in [tex]0.0617\; {\rm mol}[/tex] formula units of CuCl₂.

The mass of [tex]1\; {\rm mol}[/tex] of chloride ion is 35.45 grams.

The mass of [tex]0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions will be [tex]35.45 \times 0.123 \approx 4.4\; {\rm g}[/tex].

Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.

Answer:

50mL NaOH

This is the answer for edge

part 1: .0025

part 2: 50

part 3: .033

Answer: it's 50. also the answers that the other dude posted are correct for edg.

Explanation:

The correct option is D.

Nowadays, scientists classified substances into four states of matter, which are: solid, liquid, gases and plasma. Plasma are hot ionized gas that is made up of equal number of positively and negatively charged ions. The ions in the plasma have very high kinetic energy which allow them to move around at high speed. Plasma is typically produce by heating gases to very high temperature.  

Answer:

New concentration = 1.512 M

Explanation:

Using the equation for dilution;

M1V1 = M2V2

M1 = 12.4 M , V1 = 100 mL or 0.1 L

M2 = ? , V2 = 0.820 L

Therefore;

M2 = M1V1/V2

     = (12.4 × 0.1 )/(0.820L)

     = 1.512 M

The Earth weighs, 5.972 × [tex]10^{24}[/tex] kg. For far away the sun is from the Earth is, 92.96 million mi.

wavelength i think should be correct

Your answer would be sodium hydroxide.

Your compound is an ionic molecule, because of the positivity of sodium and the negativity of the OH.

In naming these, the name starts with the metal. In this case, it's sodium.

So we know it's sodium _____.

You're left with the OH. To combine them, it becomes hydroxide.

Therefore, you're left with sodium hydroxide.

Good luck!

magnesium oxide is: MgO (right side)

so the left side is: Mg + O2

for the equation to be balanced there must be two oxygens on both sides

Mg + O2 = 2MgO

but now the magnesium is uneven, so there must be two magnesiums on each side

the answer is: B) 2Mg + O2 = 2MgO

Answer : The correct balanced chemical reaction will be,

(B) [tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

Synthesis reaction : A chemical reaction where multiple substances or reactants combine to form a single product.

It is represented as,

[tex]X+Y\rightarrow XY[/tex]

The balanced chemical reaction will be,

[tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

1. u divide the mass 20.0g by its molar mass of 44.01g/mol = 0.454mol

2. using the formula PV=nRT

105kPa x V = 0.454mol (use the non rounded value) x 8.314Lkpa/molK x 298K

V= 10.7L :)

The volume that 20.0g of CO2 would occupy at a temperature of 298k and a pressure of 105 kPa is approximately 10.5 liters. The ideal gas law (PV=nRT) was used to calculate this.

To answer this question, we would use the ideal gas law, which states that the pressure of a gas times its volume is equal to the number of moles of the gas times the gas constant times the temperature in Kelvin.

PV = nRT

You can think of it as the pressure and volume of a gas is directly proportional to its temperature and the number of particles (moles) of gas.

First, we need to find out how many moles of CO2 we have. We have 20.0 g of CO2, and the molar mass of CO2 is about 44 g/mol. So, we have: 20.0g / 44 g/mol = 0.455 moles of CO2

Next we plug this into the ideal gas law equation:

105 kPa * V = 0.455 moles * 8.31 J/(mol*K) * 298 K

Solving for V, we find that the volume is about 10.5 liters

So, 20.0 g of CO2 would occupy a volume of about 10.5 liters at a temperature of 298 K and a pressure of 105 kPa.

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The answer is C a primary source

Answer: C. A primary source, because it will contain more details.

Explanation:

A primary source is the source which provides the first hand experience of an experiment, methodology, event and it considered to be authoritative, as it comes from the owner of the research piece. The primary source represents the thinking, discoveries and events which are original.

A secondary source includes the information which generates after the analysis, interpretation and evaluation of the information, or data from the primary source.

According to the given situation, as the botanist wants to learn about the new method of crossbreeding orange trees. The new method will be latest and may not be applied much by other scientist. Therefore, the source of information will be primary. It will contain more details.  

Answer:

d-  334 kJ/g.

Explanation:

You can detect it from the units of the different choices.

a- has the unit J/g.°C that is the unit of the specific heat capacity (c).

b- has the unit Kelvin that is the unit of temperature.

c- has the unit g/mol which is the unit of the molar mass.

d- has the unit kJ/g which is the unit of the enthalpy divided by the no. of rams that is the specific entha;py of fusion.

So, the right choice is: d-  334 kJ/g.

Answer:

[H₃O⁺] = 0.05 M & [OH⁻] = 2.0 x 10⁻¹³.

Explanation:

HNO₃ + H₂O → H₃O⁺ + NO₃⁻.

[H₃O⁺] = 0.05 M.

∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.

∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺] = 10⁻¹⁴/0.05 = 2.0 x 10⁻¹³.

Answer:

2.41 M

Explanation:

The molarity is the moles of FeCl3 over the liters of solution. Since you're given mL you need to change it to L which is 0.12 L. 0.289 divided by 0.12 is your answer

Final answer:

The molarity of 0.289 moles of [tex]FeCl_3[/tex] dissolved in 120 mL of solution is 2.408 M.

Explanation:

To calculate the molarity (M) of a [tex]FeCl_3[/tex] solution, you use the formula:

[tex]M = \frac{moles of solute}{ liters of solution}[/tex]

In this case, we have 0.289 moles of [tex]FeCl_3[/tex] dissolved in 120 mL of solution. First, we must convert 120 mL to liters by dividing by 1000 (since there are 1000 mL in a liter), giving us 0.120 liters.

Now plugging the values into the molarity equation:

[tex]M = \frac{0.289 moles}{0.120 L} = 2.408 M[/tex]

Therefore, the molarity of the [tex]FeCl_3[/tex] solution is 2.408 M.

{System:Hello beautiful user! The answer for this question is B-Chemical reaction. It’s chemical reaction because melting ice is being used my a natural chemical and it’s also a reaction from the natural chemical. I hope this helps you! •.•}

Answer: Option (c) is the correct answer.

Explanation:

A chemical reaction is defined as the reaction that leads to formation of new substances through exchange of electrons.

For example, [tex]2Al + 3CuCl_{2} \rightarrow 2AlCl_{3} + 3Cu[/tex]

Here, aluminium on displacing copper from copper chloride leads to the formation of a new compound, that is, aluminium chloride.

Hence, it shows that atoms of reactant molecules rearrange themselves to form new substances.

Thus, we can conclude that during a chemical reaction atoms of reactants rearrange to form new substances .

maybe centuries classified according to their chemical and mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size

Explanation:

Igneous rocks -

These type of rocks are formed via the crystallization of the liquid , which is the molten rocks .

The categories of distribution of the igneous rock is -

1. Intrusive or the plutonic rocks .

2.  Extrusive or volcanic rocks .

And the classification of Igneous rock is as follows -

1. felsic

2. mafic

The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.

Balancing a chemical equation is crucial as it adheres to the law of conservation of mass, indicating the same number and types of atoms on both sides. This reflects the physical reality of chemical reactions, where mass and atom types are conserved, allowing for accurate predictions and understanding of reactions.

The requirement that the numbers and types of atoms be the same on both sides of a chemical equation is fundamental to the law of conservation of mass. This law states that mass cannot be created or destroyed in a chemical reaction. Therefore, a balanced chemical equation ensures that the same amount of each element is present on both sides of the equation, aligning with this universal law. To balance a chemical equation, coefficients are placed in front of the reactants or products to ensure that the number of atoms for each element is equal on both sides. This process does not involve changing the substances themselves but rather adjusting the quantities to reflect the conservation of atoms. For instance, if an equation starts with two hydrogen molecules reacting with one oxygen molecule to produce water, the balanced form would show that two water molecules are produced, maintaining the count of hydrogen and oxygen atoms. In practice, balancing a chemical equation not only obeys the law of conservation of mass but also ensures the equation accurately represents the physical reality of how substances interact and transform. This precision is crucial for predicting the outcomes of reactions, calculating reactant and product quantities, and understanding the molecular rearrangement during the reaction. Unbalanced equations, by contrast, imply that atoms are lost or gained, misrepresenting the reaction's nature.

The correct answer is E. 50 grams

The solubility of Ammonium Chloride has an increasing trend as the temperature increases. Experiments show that the solubility at 323K is approximately 50.4 grams per 100 grams o water thus this value is close to choice D, 50 grams

Answer: The correct answer is Option E.

Explanation:

Solubility is defined as the amount of substance (known as solute) which is dissolved in a unit volume of liquid substance (known as solvent) to produce a saturated solution at specific temperature and pressure. It is expressed in number of moles of solute present per 100 grams of solvent.

This property is directly dependent on temperature. As, the temperature increases, the solubility of the solute increases and vice-versa.

[tex]\text{Solubility}\propto \text{Temperature}[/tex]

[tex]NH_4Cl[/tex] is an ionic salt whose solubility increases as we increase the temperature.

The solubility of ammonium chloride at 50°C is 50 grams.

Hence, the correct answer is Option E.

There are 4 N and 12 H so I think 16

There are 16 atoms in 4NH3

The smallest part of the matter is called atom .

An atom contains neutron, proton and electrons.

In the given question there is one molecule of NH3 , there is one Nitrogen atom and three hydrogen atom . So, for four molecule of NH3 there are four nitrogen atom and 4*3 hydrogen atom means twelve hydrogen atom.

So, total number of atoms in 4NH3 is 4+12 = 16

To learn about an atom here

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Esterification is an B. Equilibrium reaction.

Answer: option B, Equilibrium

Explanation: Formation of ester by the reaction of Carboxylic acid and alcohol in the presence of mineral acids is called Esterification.

And entire reaction is a reversible and in equilibrium

A reverse reaction occurs on hydrolysis of Ester.

Hence Reactants and products are in equilibrium.

Example

CH3COOH+C2H5OH <------> CH3COOC2H5 +H2O

It will decrease the volume of gas.

The volume of the gas has decreased by 1/2.

Answer:

Explanation:

Group 2 metals

Answer:

strontium

Explanation:

The answer is B.

Hope this helped you!

B. mass is the correct answer

The earth’s atmosphere is heated through radiation by the sun. This means the wavelengths of the sunlight are absorbed by the molecules hence exciting them. When a mass of air is heated by radiation,  it becomes less dense creating an area of low pressure. The air rises and cooler air mass moves in to replace the rising air. This is how winds are created.

Answer:

n of krypton = 1.23 mol.

The no. of moles will not be changed, if the gas is either argon or krypton.

Explanation:

Where, P is the pressure of the gas in atm (P = 6.0 atm).

V is the volume of the gas container in L (V = 5.0 L).

n is the no. of moles of the gas.

R is the general gas constant (R = 0.082 L.atm/mol.K).

T is the temperature of the gas in K (T = 25.0°C + 273 = 298.0 K).

∴ n = PV/RT = (6.0 atm)(5.0 L)/(0.082 L.atm/mol.K)(298.0 K) = 1.228 mol = 1.23 mol.

The no. of moles will not be changed, if the gas is either argon or krypton because it does not depend on the type of the gas.

black would be BB .

dominant gene is B.

phenotyope is where it says white fur.

recessive gene is b.

white is bb

Polar bears float on ice floes to hunt for food.

Water's unique property of having lower density in its solid form allows ice to float on water. The orientation of hydrogen bonds during freezing causes water molecules to spread out, making ice less dense than liquid water. This unique property is vital for the survival of aquatic organisms in freezing conditions.

One example of the unique density property of water is how ice floats on water. This is due to water's lower density in its solid form, a result of the way hydrogen bonds are oriented as water freezes: the water molecules are pushed farther apart compared to liquid water. This is different from most other liquids, where solidification involves an increase in density.

Thus, when water freezes, it expands and becomes less dense than its liquid form, causing ice to float on water. This provides an insulating layer, preserving the lives of aquatic organisms in freezing conditions. This is a feature unique to water and is a consequence of its abnormal density behavior.

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Answer:

c- parallel circuit

Explanation:

C

Circuits with multiple paths between the power source and devices are called parallel circuits.