20 POINTS PLEASE ANSWER ASAP!!!!

Why is calcium (Ca) in group 2, period 4 on the periodic table?

A Calcium, like all group 2 elements, is nonreactive and a gas at room temperature.

B Calcium, like all period 4 elements, is nonreactive and a gas at room temperature,

C Calcium, like all group 2 elements, is reactive and a solid at room temperature.
D. Calcium, like all period 4 elements, is reactive and a solid at room temperature.​

The enthalpy diagram for the formation of compound that we have which is C₆H₁₂O₆ has been shown in the image attached.

The Hess law of the constant heat formation states that we can be able to obtain the heat of the formation of the substance as the sum of the heats or the enthalpies of all the processes that took place. Thus the total heat has to be obtained in an additive manner.

The compound that we are trying to obtain here is C₆H₁₂O₆ and we can see that the achievement of the compound would have to pass through a number of processes. All the reactions that can be used to obtain the desired products have been shown below.

The enthalpy cycles are;

6 C(s) + 6 O₂(g) ⇒ 6 CO₂(g) ΔHc = 6*(-395) = - 2,370 kJ/mol

6 H₂(g) + 3 O₂(g) ⇒ 6 H₂O(l) ΔHc = 6*(-269.4) = -1,616. kJ/mol

6 CO₂(g) + 6 H₂O(l) ⇒ 6 O₂(g) + C₆H₁₂O₆(s) ΔHc = -1*(-2900) = 2900 kJ/mol

Learn more about enthalpy:brainly.com/question/13996238

#SPJ1

Answer:

133.340538.

Explanation:

The answer is 133.340538. We assume you are converting between grams AlCl3 and mole. You can view more details on each measurement unit: molecular weight of AlCl3 or mol This compound is also known as Aluminium Chloride. The SI base unit for amount of substance is the mole.

29 is not the best answer depends on the context and the rules for significant figures.

What is best answer?

The best answer depends on the context and the rules for significant figures. If we assume that we need to round to three significant figures:

Therefore, 29 is not the best answer.

To know more about significant figures, visit:

https://brainly.com/question/30465808

#SPJ1

Mass of Calcium Carbonate = 500 grams

The required reaction would be:

CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl

Number of moles of CaCO₃:

Number of moles = given mass / molar mass

Number of moles = 500 / 100              [molar mass of CaCO₃ = 100g/mol]

Number of moles = 5 moles

Using the power of stoichiometry!!!

CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl

from the balanced reaction listed above, we can see that one mole of CaCl₂ and one mole of Na₂CO₃ produces one mole of CaCO₃

Moles of CaCl₂ = Moles of Na₂CO₃ = Moles of CaCO₃

we just solved for the number of moles of CaCO₃, which gives us

Moles of CaCl₂ = Moles of Na₂CO₃ = 5 moles

Hence, 5 moles of CaCl₂ and Na₂CO₃ each is required

Photosynthesis is the primary process for which the sun is responsible on earth.

For more information on photosynthesis kindly visit to

https://brainly.com/question/29775046

#SPJ1

When copper reacts with oxygen to form copper oxide, the resulting compound, CuO, exhibits the properties are: Appearance, Melting and boiling point, Density, Solubility ,Reactivity, Electrical conductivity.

Appearance: Copper oxide is a black or brownish-black solid.

Melting and boiling point: Copper oxide has a high melting point of about 1326°C and a boiling point of 2000°C.

Density: The density of copper oxide is about 6.3 g/cm³.

Solubility: Copper oxide is insoluble in water, but it can dissolve in acids such as hydrochloric acid or sulfuric acid.

Reactivity: Copper oxide is a basic oxide, which means that it reacts with acids to form salts and water. It can also react with carbon dioxide to form copper carbonate.

Electrical conductivity: Copper oxide is a poor conductor of electricity.

Overall, copper oxide is a stable, non-toxic compound that is commonly used as a pigment, catalyst, and in ceramic and glass manufacturing.

To learn more about Electrical conductivity

https://brainly.com/question/29765686

#SPJ4

Answer:

0.013

Explanation:

When calcium nitrate and potassium fluoride solutions react to form a precipitate, the type of reaction involved is the process is double replacement

Calcium nitrate and potassium fluoride solutions react to form calcium fluoride and potassium nitrate. Calcium fluoride would precipitate out whereas potassium nitrate would be in aqueous form.

Ca (NO₃)₂ (aq) + 2 KF (aq) → CaF₂ (s) + 2 KNO₃ (aq)

In double replacement reaction, the ionic compounds would exchange their respective ions to form a new compound. Here two ionic compounds, nitrate and fluoride from calcium and potassium respectively are exchanged to form calcium fluoride and potassium nitrate.

To know more about Double replacement reaction

https://brainly.com/question/17970302

#SPJ1

Answer

c. twice as great

EXPLANATION

According to Amonton's Law, which states that the pressure of an ideal gas varies directly with the absolute temperature when the volume of the sample is held constant.

Therefore, doubling the absolute temperature of a given amount of gas also doubles its volume, if the pressure is constant, and vice versa.

So the correct answer is option c. twice as great.

Transient stage is also called the unstable stage and in this stage, there is a gradual decrease in deformation rate to a definite constant value.

A transient state is when a process variable or variables changes, but before the system reaches a steady state.

Transient time is the time it takes for a circuit to change from one steady state to the next.

Therefore, Transient stage is also called the unstable stage and in this stage, there is a gradual decrease in deformation rate to a definite constant value.

Learn more about Transient stage here ;

https://brainly.com/question/22686897

#SPJ1

Answer:

\(H^++NH_3\rightleftharpoons NH_4^+\)

Explanation:

Hello there!

In this case, since the buffer is not given, we assume it is based off ammonia, it means the ammonia-ammonium buffer, whereas the ammonia is the weak base and the ammonium ion stands for the conjugate acid. In such a way, when adding HI to the solution, the base of the buffer, NH3, reacts with the former to promote the following chemical reaction:

\(H^++NH_3\rightleftharpoons NH_4^+\)

Because the HI is totally ionized in solution so the iodide ion becomes an spectator one.

Best regards!

Answer:

the above answer is wrong

Explanation:

its really not but the mastering chemistry says it is

The reaction time decreases as the temperature increases of the reaction mixture increases.

A sample record of results is:

An increase in temperature leads to an increase in reaction rate or a decrease in reaction time.

The increase in temperature provides more thermal energy to the reactant molecules, which leads to an increase in the average kinetic energy of the molecules. As a result, more reactant molecules have sufficient energy to overcome the activation energy barrier and undergo successful collisions, leading to an increased reaction rate.

Learn more about reaction time at: https://brainly.com/question/26142029

#SPJ1

Answer: For many calculators, including the TI –83 and TI 83 Plus, the [EE] button is used to enter scientific notation. The [EE] button can be found in yellow above the comma key [,].

Answer:

Condensation

Explanation:

Zoe is quite keen to have noticed what we call condensation. Air contains many components, one of those being water vapor. Like how sugar is soluble in water, water can be said to be "soluble" in air. Water will evaporate into the air to a certain extent. The higher the temperature of the air, the more water the air can hold. If the air has more water that it can hold (potentially because of a temperature decrease), the extra water will come out of the air. Zoe's water bottle was cold, and because the air around Zoe's bottle had cooled down, the air can not hold as much water as it could when it was warm, so the air deposited the extra water in the form of liquid water onto the bottle, giving the illusion that her bottle was sweating.

Answer: Copper (II) Sulfate! (CuSO4)

Explanation:

This is because compared to the other salts, it is the visible color blue. The other ones are plain white. Happy holidays! Don’t stress :)

the pH of the aqueous solution is 8.51 with a hydrogen ion concentration of [H+]=3.1×\(10^-9\)M

The pH of the aqueous solution can be calculated using the formula:

pH = -log[H+]

where [H+] is the hydrogen ion concentration of the solution.

Substituting the given value, we get:

pH = -log(3.1×\(10^-9\))

pH = 8.51

An aqueous solution is one in which water serves as the solvent. It is utilised in a variety of applications, including analytical chemistry, biochemistry, and industrial chemistry. It is the most prevalent kind of solution used in chemical reactions. Water serves as both the solvent and the solute in an aqueous solution, where the solute is often a solid, liquid, or gas. Due to its high polarity and capacity to make hydrogen bonds with other molecules, water is an excellent solvent that can dissolve a variety of materials, including polar molecules and ionic compounds. Acid-base reactions, redox reactions, and precipitation reactions are just a few of the numerous chemical processes that take place in aqueous solutions. A variety of variables can have an impact on an aqueous solution's characteristics.

Learn more about aqueous solution here:

https://brainly.com/question/26856926

#SPJ1

Answer:

A graph can be very handy in collecting data and storing it in one place. A graph can be a very effective tool in presenting visual information rather swiftly. Hope this helps! I am learning about graphs in my course!

Explanation:

Answer:

graph) a diagram showing the relation between variable quantities, typically of two variables, each measured along one of a pair of axes at right angles.

Explanation:

Graphing is used daily. From stockbrokers to performance evaluation in companies. All use them to boost sales and meet deadlines. Even simple calculations can be assessed better by using a graph.

(let me know if this helps?)

Answer

False

Explanation:

According to the information provided, the unidentified molecule has the molecular formula CHN, which equals a molecular weight of 13 amu. This suggests that the molecule has one carbon atom and one nitrogen atom.

We may infer from the mass spectrum that the molecule is neither a branched nor substituted alkane because there are no alkyl fragments seen there. The base peak at m/z 27, which is the compound's molecular ion, is the only peak seen in the spectrum.

A molecule with a single carbon atom and a single nitrogen atom coupled by a triple bond has the structure that best fits the mass spec data. This is equivalent to the cyanide molecule, which has the chemical formula H-C-N.

to know more about molecular formulas here:

brainly.com/question/28647690

#SPJ1

According to the electronic configuration, the element which has only 2 electrons in the 4p suborbital is Germanium (Ge).

The electron configuration of an atom or molecule refers to how the electrons are arranged within each orbital. The energy level (the period) should come first when writing an electron configuration, followed by the subshell that has to be filled and the superscript, which indicates how many electrons are in that subshell.

In the electronic configuration, the 4p subshell's sub level is the 4p orbital. The Pauli exclusion principle governs the filling of the orbital with electrons. A p orbital has a maximum capacity of 6 electrons. The 4p subshell consists of the orbitals 4px, 4py, and 4pz.

The integer 4 is the fundamental quantum number, and the 4p orbital is the portion of the p subshell that is available in the fourth level of energy in the electronic configuration. The azimuthal quantum number is 1, as the subshell is p.

There can be a maximum of two electrons in each orbital, making a total of six electrons in the p orbital. As a result, a total of six electrons may be accommodated in the 4p subshell and two electrons in the 4p orbital.

The electronic configuration of the elements given are:

O – \(1s^2 2s^2 2p^4\)

S – \(1s^2 2s^2 2p^6 3s^2 3p^4\)

Se – \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^1^0 4s^2\)

Ge – \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1^0 4p^2\)

Si – \(1s^2 2s^2 2p^6 3s^2 3p^2\)

Therefore, Germanium (Ge) has only 2 electrons in the 4p suborbital.

Learn more about electronic configuration here:

https://brainly.com/question/14283892

#SPJ9

Answer:

The lowest point on a wave?

The lowest point on the wave is called as through or wave through.

The highest point on the wave is known as the crest or wave crest

The space between the crests is called the wave length.

The distance between the wave crest and the wave trough is called the wave height.

#CarryOnLearning

Answer:

Trough

Explanation:

The trough is the lowest point on a wave. The highest point on a wave is called a crest.

Answer:

3 Ni + Fe(NO₃)₃ --> 3 Ni(NO₃) + Fe

Explanation:

In this question, the reactants are;

Solid Nickel and Iron nitrate. This is represented as;

Ni and Fe(NO3)3

The equation of the reaction is given as;

3 Ni + Fe(NO₃)₃ --> 3 Ni(NO₃) + Fe

The option that closely matches this is;

Option D. (Although the reaction is not balanced)

The ∆H of solution of NaOH is 46.8 kJ/mol.

First, we need to calculate the amount of heat absorbed by the solution:

q = m × c × ∆T

where q is the heat absorbed (in Joules), m is the mass of the solution (in grams), c is the specific heat capacity of the solution (in J/(g °C)), and ∆T is the change in temperature (in °C).

In this case, the mass of the solution is the sum of the mass of NaOH and the mass of water:

m = 7.59 g + 80.0 g = 87.59 g

The change in temperature is:

∆T = 48.0 °C - 25.0 °C = 23.0 °C

Substituting the values, we get:

q = 87.59 g × 4.184 J/(g °C) × 23.0 °C = 8,878 J

Next, we need to convert the heat absorbed into the enthalpy change of solution (∆H). The enthalpy change of solution is the heat absorbed per mole of solute. The number of moles of NaOH is:

n = m/M

where M is the molar mass of NaOH, which is 40.00 g/mol.

n = 7.59 g / 40.00 g/mol = 0.1898 mol

Therefore, the enthalpy change of solution is:

∆H = q/n = 8,878 J / 0.1898 mol = 46,780 J/mol = 46.78 kJ/mol

The H of a NaOH solution, rounded to three significant numbers, is 46.8 kJ/mol.

To know more about the Temperature, here

https://brainly.com/question/30411639

#SPJ1

Answer:

A. \(\mathbf{\Delta G^0 = -72.6 \ kJ/mol}\) ; as such the reaction is said to be spontaneous since the value of \(\mathbf{\Delta G^0 }\) is negative.

B.  \(\mathbf{\Delta G^0_{702 \ K} = -13.29 \ kJ/mol.K}}\) and the reaction is spontaneous

Explanation:

The equation for this chemical reaction is :

\(2NO_{(g)} +O_{2(g)} \to 2NO_{2(g)}\)

Using the following relation to calculate \(\Delta G^0\);

\(\Delta G^0 = [2(\Delta G^0_{NO_{2(g)}}] - [1(\Delta G^0_{O_{2(g)}})+ 2(\Delta G^0_{NO_{g}})]\)

At 298 K; the standard Gibbs Free Energy for the formation are as follows:

\(\Delta G^0_{NO_{2(g)}} = 51.2 \ kJ/mol\)

\(\Delta G^0_{O_{2(g)}} = 0\)

\(\Delta G^0_{NO_{g}}= 87.6 \ kJ/mol\)

Replacing them into the above equation;

\(\Delta G^0 = [2(51.2 \ kJ/mol}] - [1(0)+ 2(87.6 \ kJ/mol})]\)

\(\Delta G^0 = [102.4 \ kJ/mol}] - [175.2 \ kJ/mol})]\)

\(\mathbf{\Delta G^0 = -72.6 \ kJ/mol}\)

Thus; \(\mathbf{\Delta G^0 = -72.6 \ kJ/mol}\) ; as such the reaction is said to be spontaneous since the value of \(\mathbf{\Delta G^0 }\) is negative.

B.

Using the same above chemical equation;

The relation used for calculating \(\mathbf{\Delta G^0}\) of the reaction when the temperature is 702 K is:

\(\Delta G^0_{702 \ K} = \Delta H^0_{xn} - T \Delta S^0_{rxn}\)

where;

\(\Delta G^0_{702 \ K} =\) Gibbs free energy of the reaction at 702 K

\(\Delta H^0_{xn}\) = standard enthalpy of the reaction = -116.2 kJ/mol

\(\Delta S^0_{rxn}\) = standard entropy of the reaction = -146.6 J/mol/K

Temperature T = 702 K

\(\Delta G^0_{702 \ K} = -1162. \ kJ/mol - 702 \ K ( -146.6 \ J/mol. K (\dfrac{1 \ kJ }{1000 \ J})\)

\(\Delta G^0_{702 \ K} = -1162. \ kJ/mol - 702 \ K ( 0.1466 \ kJ/mol.K})\)

\(\Delta G^0_{702 \ K} = -13.2868 \ kJ/mol.K}\)

\(\mathbf{\Delta G^0_{702 \ K} = -13.29 \ kJ/mol.K}}\)

Thus \(\mathbf{\Delta G^0_{702 \ K} = -13.29 \ kJ/mol.K}}\) and the reaction is spontaneous

Answer:

Option 1

Explanation:

You need to make the number of each type of atom on both sides the same, and this can only be done by changing the coefficients.

Answer:

these elements do not have the same masses.

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

For more such questions on molecules

https://brainly.com/question/1351818

#SPJ8