Which is the electron configuration for zinc? A. 1s₂2s₂2p₆3s₂3p₆3d84s₂ B. 1s₂2s₂2p₆3s₂3p₆3d₁₀4s₁ C. 1s₂2s₂2p₅3s₂3p₆3d₁₀4s₂ D. 1s₂2s₂2p₆3s₂3p₆3d₁₀4s₂

Answers

Answer 1

Answer:

Answer:

Explanation:

The atomic number of zinc is 30, which means that the neutral atom has equal numbers of protons and electrons, so a neutral atom of zinc would have 30 electrons.

The electron configuration of a neutral zinc atom is 1s

The Zn

ion has lost two electrons, which leaves it with 30 protons and 28 electrons.

The electron configuration of Zn

is 1s

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Cellulose and chitin are linked by what type of bond? A) Glycosidic bond B) Peptide bond C) Disulfide bond D) Hydrogen bond

Answers

Answer: The correct answer is: A) Glycosidic bond

Explanation: Cellulose and chitin are both complex carbohydrates made of repeating units of glucose. These repeating units are linked together by glycosidic bonds, specifically beta-glycosidic bonds, which are a type of covalent bond connecting the sugar molecules in a linear fashion.

Which formula represents an ionic compound

Answers

If these are the options 1.H2, 2.CH4, 3.CH3OH, 4.NH4CI. Then the anwer is 4.NH4CI

NH4Cl dissociates into ions (NH4+ and Cl-) in water.

Find the mass of AlCl3 that is produced when 10 g of Al2O3 reacts with 10 g of HCl according to the following equation Al2O3(s) + 6HCl(aq) --> 2AlCl3(aq) + 3H2O(aq) Please select the correct option: A. 16.2 g B. 20.0 g C. 10.0 g D. 6.10 g E. 12.2 g

Answers

Answer:

Considering the reaction stoichiometry and the definition of limiting reagent, the mass of AlCl₃ that is produced when 10.0 grams of Al₂O₃ react with 10.0 grams of HCl is 12.19 grams.

Explanation:

Al₂O₃ + 6 HCl → 2 AlCl₃ + 3 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Al₂O₃: 1 mole

HCl: 6 moles

AlCl₃: 2 moles

H₂O: 3 moles

The molar mass of the compounds present in the reaction is:

Al₂O₃: 102 g/mole

HCl: 36.45 g/mole

AlCl₃: 133.35 g/mole

H₂O: 18 g/mole

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:

Al₂O₃: 1 mole× 102 g/mole= 102 grams

HCl: 6 moles× 36.45 g/mole= 218.7 grams

AlCl₃: 2 moles× 133.35 g/mole= 266.7 grams

H₂O: 3 moles× 18 g/mole= 54 grams

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 102 grams of Al₂O₃ reacts with 218.7 grams of HCl, 10 grams of Al₂O₃ reacts with how much moles of HCl?

mass of HCl= 21.44 grams

But 21.44 grams of HCl are not available, 10 grams are available. Since you have less moles than you need to react with 10 grams of Al₂O₃ , HCl will be the limiting reagent.

Then, it is possible to determine the mass of AlCl₃ produced by another rule of three: if by stoichiometry 218.7 grams of HCl produce 266.7 grams of AlCl₃, if 10 grams of HCl react how much mass of AlCl₃ will be formed?

mass of AlCl₃= 12.19 grams

In summary, the mass of AlCl₃ that is produced when 10.0 grams of Al₂O₃ react with 10.0 grams of HCl is 12.19 grams.

An experiment produced 0.10 g CO2, with a volume of 0.056 L at STP. If the accepted density of CO2 at STP is 1.96 g/L, what is the approximate percent error?

Answers

According to the accepted density of CO2, we can get that 0.10 g CO2 has a volume of 0.10/1.96=0.051 L (theoretical value). The percent error = (0.056 - 0.051)/0.051 * 100% = 9.80%.

The rate law for a hypothetical reaction is rate = k [A]2. When the concentration is 0.10 moles/liter, the rate is 2.7 × 10-5 M*s-1. What is the value of k?

Answers

Answer:The value of rate constant is $2.7* 10^(-3) Ls^(-1) mol^(-1)$ .

Explanation:

Concentration of [A]=0.10 mol/L

The rate of the reaction = $2.7* 10^(-5) M/s$

Rate constant = k

The given rate law:

$R=k[A]^2$

$2.7* 10^(-5) M/s=k* (0.10 mol/L)^2$

$k=(2.7* 10^(-5) mol/L s)/(0.10 mol/L* 0.10 mol/L)=2.7* 10^(-3) Ls^(-1) mol^(-1)$

The value of rate constant is $2.7* 10^(-3) Ls^(-1) mol^(-1)$ .

Given:

rate = k [A]2

concentration is 0.10 moles/liter

rate is 2.7 × 10-5 M*s-1

Required:

Value of k

Solution:

rate = k [A]2

2.7 × 10-5 M*s-1 = k (0.10 moles/liter)^2

k = 2.7 x 10^-3 liter per mole per second

A light twig is barely floating on the surface of water. What will most likely happen to the twig if a drop of dishwashing detergent is added near it?It will float easily because soap disrupts the intermolecular forces of water.It will sink because soap increases the intermolecular forces of water.It will sink because soap disrupts the intermolecular forces of water.It will float easily because soap increases the intermolecular forces of water.

Answers

Answer;

- It will sink because soap disrupts the inter-molecular forces of water

Explanation;

-A light twig is barely floating on the surface of water. if a drop of dish washing detergent is added near it then it will sink because soap disrupts the inter- molecular forces of water.

-The twig was initially floating due to the force of surface tension created by the inter-molecular forces between water molecules. When soap is added to the water, the twig will be driven to sink by the disruption of the water's surface tension. This is because soap is a surfacant that is amphipathic and thus disrupts the inter-molecular forces between water molecules that are responsible for surface tension.

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Imagine you are working in a laboratory that makes tablets for relieving indigestion. The tablets work by reacting with water or acid in the stomach. Carbon dioxide gas is produced as a result. You are asked to determine if taking the tablets with alcohol will affect the speed at which the tablets work.Describe how you will carry out your investigation. You can use any or all of the apparatus below. (You may include diagrams of your experimental set-up.)• 3 (100 cm³) conical flasks• 3 balloons• 3 rubber bands• 3 indigestion tablets• water• alcohol• measuring cylinder• stopwatch• mass balance

Can someone show me a step by step with the answer?

"For the following compound with three carbonyl groups, can you rank these carbonyl groups in order of increasing wavenumber in an infrared (IR) spectrum, and explain the reasoning behind the ranking?"