An ionic bond for calcium and oxygen is cao. if an oxygen ion has a charge of two negative, what is the charge for calcium? 2 –1 1 –2

Answers

Answer 1

The charge on calcium in CaO is 2.

A bond between two atoms is formed by two ways: by complete transfer of electrons or by sharing of electrons. The bond formed by transfer of electrons is called an ionic bond while the bond formed by electrons sharing is called the covalent bond. There is on clear positive or negative charge on atoms in a molecules in case of covalent bond.

It is given that an ionic bond is formed between calcium and oxygen. The oxygen has -2 charge. This means that oxygen atoms has accepted two electrons from calcium. When an atoms donate electrons it acquires positive charge.

Ca gives two electrons to oxygen atom. Hence, the charge on calcium is +2. The correct option is 2.

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Related Questions

The half-life of 131I is 80 days. How much of a 500.0 mg sample remains after 3 half lives?

Answers

Answer:

62.5 mg

Explanation:

Just multiply the original amount by  1/2   three times:

500 mg  x  1/2  x  1/2  x  1/2 = 62.5 mg

Increasing which factor will cause the gravitational force between two objects to decrease?
weights of the objects
distance between the objects
acceleration of the objects
masses of the objects

Answers

Answer:

mass increase!

Explanation:

<3

Answer:

b.distance between the objects

Explanation:

If you pull objects apart from each other they don't have as strong of a gravitational pull. think of it like a magnet the heavier the magnets the more power they can hold, the bigger they are the more surface area they have, and when you pull 2 magnets apart they slowly come weaker to each other.


What type of system is a home, school, or room?

Answers

Answer:

room

Explanation:

because it'd in your house and u go there everyday and sleep and live there

A sample of a gas is occupying a 1500 ml container at a pressure of 3.4 atm and a temperature of 25 oc. if the temperature is increased to 75 oc and the volume is increased to 2000 ml, what is the new pressure?

Answers

The new pressure will be 7.65 atm

General gas law

The problem is solved using the general gas equation:

P1V1/T1 = P2V2/T2

In this case, P1 = 3.4 atm, V1 = 1500 mL, T1 = 25 [tex]^O C[/tex], V2 = 2000 mL, and T2 = 75  [tex]^O C[/tex]

What we are looking for is P2.

Thus, P2 = P1V1T2/T1V2

          = 3.4 x 1500 x 75/25 x 2000 = 382500/50000 = 7.65 atm

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Classify the chemical reaction: Cl₂O5 + H₂O → 2HCIO3

Answers

The reaction is an addition reaction.

What is an addition reaction?

Addition reactions are chemical reactions involving 2 or more reactants reacting to produce a single product.

Addition reactions are different from decomposition reactions. In the latter, a single reactant decomposes to give two or more products.

In the illustrated reaction, Cl₂O5 and H₂O react together to form a single product, HCIO3.

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What is the molar mass of cholesterol if 0.00105 mol weigh 0.406 g?

Answers

Answer:

387 g/mol

Explanation:

The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:

Molar Mass (g/mol) = mass (g) / moles

You can plug the given values into the ratio to find the molar mass.

Molar Mass = mass / moles

Molar Mass = 0.406 g / 0.00105 mol

Molar Mass = 387 g/mol

What is the function of the structure labeled Y?

to keep oxygen-rich blood and oxygen-poor blood flowing
to filter waste materials from oxygen-poor blood
to filter waste materials from oxygen-rich blood
to keep oxygen-rich blood and oxygen-poor blood separate

Answers

The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.

Function of the Septum

Y is the septum

The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.

Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.

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Question 4 of 10
A new type of technology that uses stem cells to grow body parts is called
what?
OA. Organ engineering
OB. Passive prosthetics
OC. Tissue engineering
OD. Stem cell scaffolding
SUBMIT

Help!!

Answers

Answer:

A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.

Explanation:

"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic

Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemical

Answers

Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.

Why Oxidizing acids can explode when mixed with incompatible chemical?

Oxidizing acids reacts violently with combustible such as alcohols, turpentine, charcoal, organic refuse because when it reacts with most metals, it release hydrogen gas in the air.

So we can conclude that Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.

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1. According to collision theory, what is not a factor that determines if two molecules will bind?
A. The direction the molecules are facing.
B. The speed the molecules are traveling.
C. The specific heat of the molecules.
D. What element the molecules are.

Answers

According to collision theory, the molecules' orientation is the only characteristic that won't affect whether two molecules will bond.

Factors affecting the collision theory:

The influences on reaction times are numerous. The collision theory can be used to explain their effects. These variables include temperature, catalysts, surface area, concentration, and reactant type. Because they all increase the quantity or energy of collisions, these factors all increase the reaction rate.Interacting components should -

                  1. collision with

                  2. have enough energy and

                  3. in the right orientation for collisions to succeed.

Collisions must have enough kinetic energy to break chemical bonds in order to properly start a reaction; this energy is referred to as the activation energy.Molecules move more quickly and smash more violently as the temperature rises, dramatically increasing the chance that a bond will break during the contact.

Therefore, the direction that two molecules are facing will not affect whether they will bond together according to collision theory that is option A is correct.

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Using a chemical equation to find moles of the product for moles of reactant

Answers

Answer:

0.10 moles H₂O

Explanation:

The unbalanced equation:

NH₃ (g) + O₂ (g) ----> NO (g) + H₂O (g)

Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen

Products: 1 nitrogen, 2 hydrogen, 2 oxygen

The balanced equation:

4 NH₃ (g) + 5 O₂ (g) ----> 4 NO (g) + 6 H₂O (g)

Reactants: 4 nitrogen, 12 hydrogen, 10 oxygen

Products: 4 nitrogen, 12 hydrogen, 10 oxygen

Now that the reaction is balanced, you can use the coefficients of the desired molecules to construct the mole-to-mole ratio. This ratio should be multiplied by the given value (0.085 moles). It is important to arrange the ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to match the given value.

0.085 moles O₂          6 moles H₂O
-------------------------  x  ------------------------  =  0.10 moles H₂O
                                      5 moles O₂

A solution is prepared by dissolving 6.42 g of Na_2SO_4 in enough water to make 135 mL of solution. Calculate the solution’s molarity.

Determine the concentration (in moles/L) of a solution made by dissolving 43.2 g of sodium chloride in 290 mL of solution.

Determine the concentration (in moles/L) of a solution made by dissolving 24.8 g of sodium chloride in 750 mL of solution.

How many grams of NaCl are contained in 350 mL of a 0.238 M solution of sodium chloride?

Calculate the mass of silver nitrate (in grams) in a 145 mL solution of 4.71 M AgNO_3.

Calculate the mass of silver nitrate (in grams) in a 290 mL solution of 4.71 M AgNO_3.

Answers

The molarity of the solution is 0.33 MConcentration = 2.54 mol/dm³Concentration = 0.56 mol/dm³Mass of NaCl =  4.87 gMass of AgNO₃ =  116.1 gMass of AgNO₃ =  232.2 g

What is the molarity of the solution?

The molarity of the solution is given as follows:

Molarity = mass/molar mass /volume (L)

Molarity = 6.42/142/0.135 = 0.33 M

What is the concentration of the solution?

The concentration of the solution is given below:

Concentration = mass/molar mass /volume (L)

Concentration = 43.2/58.5/0.29

Concentration = 2.54 mol/dm³

What is the concentration of the solution?

The concentration of the solution is given below:

Concentration = mass/molar mass /volume (L)

Concentration = 24.8/58.5/0.75

Concentration = 0.56 mol/dm³

What is the mass of NaCl?The mass of the NaCl = concentration * molar mass * volume

Mass of NaCl = 0.238 * 58.5 * 0.35

Mass of NaCl =  4.87 g

What is the  mass of silver nitrate (in grams) in a 145 mL solution of 4.71 M AgNO₃?The mass of the AgNO₃ = concentration * molar mass * volume

Mass of AgNO₃ = 4.71 * 170 * 0.145

Mass of AgNO₃ =  116.1 g

What is the  mass of silver nitrate (in grams) in a 145 mL solution of 4.71 M AgNO₃?The mass of the AgNO₃ = concentration * molar mass * volume

Mass of AgNO₃ = 4.71 * 170 * 0.29

Mass of AgNO₃ =  232.2 g

In conclusion, the mass of the substances are derived from the volume and concentration of the solution as well as the molar mass of the substance.

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Using chemical equations, show how the triprotic acid h3po4 ionizes in water. Phases are optional.

Answers

The acid that contains three hydrogen ions are called triprotic acid.

The triprotic acid h3po4 ionizes in water:

White solid pure anhydrous phosphoric acid melts into a viscous liquid at 42.35 degrees Celsius. Phosphoric acid, which contains three ion hydrogen atoms, acts as a triprotic acid in an aqueous solution. The hydrogen ions disappear one at a time.

H₃PO₄ (aq)  ⇄  H⁺ (aq) + H₂PO₄⁻ (aq)          Kₐ₁ = 7.5 × 10⁻³

H₂PO₄⁻ (aq)  ⇄  H⁺ (aq) + H₂PO₄²⁻ (aq)       Kₐ₂ = 6.2 × 10⁻³

HPO₄²⁻ (aq)  ⇄  H⁺ (aq) + PO₄³⁻ (aq)            Kₐ₃ = 7.5 × 10⁻³

The first dissociation constant of phosphoric acid indicates that it is not an especially potent acid. It is a weaker acid than hydrochloric acid and sulfuric acid, but stronger than acetic acid. The ease with which each subsequent dissociation stage happens decreases. As a result, H₂PO₄⁻  is a relatively weak acid but HPO₄²⁻ is an extremely weak acid.

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ure and
mical
ations
3
3
Posttest
Mole
ulation
Formulas
What happens when hydrogen and oxygen react?
OHydrochloric acid is produced.
Water is produced.
O Sulfuric acid is produced.
No product is formed.

Answers

The answer is Water is produced.

The Ksp of Al(OH)3 is 2.0 x 10-31 at 298 K. What is \DeltaGo (at 298 K) for the precipitation of Al(OH)3 according to the equation below?

Al3+(aq) + 3OH- (aq) -> Al(OH)3 (s)

Answers

ΔG° = -RT ln K

ΔG° = -RT ln 1/Ksp (reverse reaction, solid (Al(OH)₃ not count for equilibrium constant-K)

ΔG° = -RT ln 1/Ksp

ΔG° = -8.314 x 10⁻³ x 298 ln 1/(2 x 10⁻³¹)

ΔG° = -175.132 kJ/mol

Consider a rigid, thick-walled tube that is fi lled with H2O liquid and vapor at 0.1 MPa. After it is sealed, it is heated so that it passes through its critical point. What fraction of the mass in the tube is liquid

Answers

The fraction of the mass in the tube is liquid is mathematically given as

kg =0.99876 kg liquid/kg

What fraction of the mass in the tube is liquid?

Generally, the critical volume is mathematically given as

Vc=0.0560* 1/18

Vc=0.00311m3/g

at state 1, at saturated condition having volume 0.003111 m3/kg

for 0.1mpa

V1=0.00104KJ/kg

Vg=1.6720KJ/kg

Hence, the  quality of the vapor-liquid mixture is

Q=[tex]\frac{0.00311-0.001043}{1.6720 - 0.001043}[/tex]

Q=0.001237kgv/kgm

Mass fraction of liquid present = (1-x)

M=(1-x)

Hence

M=(1-0.001237)

kg =0.99876 kg liquid/kg

In conclusion, a fraction of the mass in the tube is liquid

kg =0.99876 kg liquid/kg

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Consider the reaction below.
21 (aq) + Cl₂(g) →→2C1¯(aq) +12(aq)
Which half reaction correctly describes the reduction that is taking place?
O Cl2(g) +2e2C1(aq)
O Cl2(g) + e->2Cl¯ (aq)
O2 (aq)12(aq) + 2e¯
21 (aq) 12(aq) + e¯

Answers

2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

What is Reduction Half Reaction ?

The half reaction of overall reaction in which reactants gain its electrons during the reaction is called Reduction Half Reaction.

What is Oxidation Half Reaction ?

The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.

The given reaction is

2I⁻ (aq) + Cl₂ (aq) → 2Cl⁻ (aq) + I₂ (aq)

Reduction Half Reaction: 2Cl + 2e⁻ → 2Cl⁻

Oxidation Half Reaction: 2I⁻ - 2e⁻ → 2I

Here Cl₂ is an oxidizing agent and I⁻ is reducing agent.

Thus from the above conclusion we can say that 2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

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explain a method in which ethanol is made non combustible to humans after exploring the information through relevant sources​

Answers

Answer:

Ethanol can be produced by fermentation and concentrated using fractional distillation .

Experiments were done on a certain pure substance ex to determine some of his properties there’s a description of each experiment and the table below the side whether the experiment was a physical or chemical property

Answers

Answer:

1.) Physical

2.) Physical (probably)

3.) Chemical

Explanation:

Physical changes are changes to substances in which the intramolecular structure does not change. The intermolecular bonds (bonds between molecules) may change, but the actual chemicals involved are not altered.

Chemical changes occur when intermolecular bonds are broken/formed, changing the old substance into something new. Chemical reactions are taking place and the ratio of the elements in molecules are changing.

1.) Melting is an example of a physical change. When melting occurs, the intermolecular bonds between molecules are breaking in response to the introduction of more heat. However, the substance is still the same substance (ex. ice melting is still water as H₂O has not been changed). In this example, scientists are most likely calculating velocity.

2.) Because the original substance is able to be completely removed from the water in the flask, this is probably just a physical change. I say probably because no changes are really occurring here. It is unclear but not probably that any reactions are taking place between the water and the sample as they are easily separated. This may be an example of (can't decide) depending on how must they want you to assume. The property being measured is probably density.

3.) While dissolving the sample was an example of a physical change because just the state of matter changed, when it reacts with sodium hydroxide, a chemical change occurs. Most likely, new bonds are being formed between the elements in the original sample and the elements in sodium hydroxide. This is what allows scientists to measure the pH of a solution.

A helium-filled balloon has a volume of 10 000 L at 20°C. Determine the volume of the
gas at 25 °C

Answers

Answer:

12,500 L

Explanation:

Because you are dealing with volume and temperature, you need to Charles' Law to find your missing value. The equation looks like this:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final volume of the gas.

V₁ = 10,000 L                 V₂ = ? L

T₁ = 20 °C                       T₂ = 25 °C

V₁ / T₁ = V₂ / T₂                                             <----- Charles' Law equation

(10,000 L) / (20 °C) = V₂ / (25 °C)                <----- Insert values

500 = V₂ / (25 °C)                                        <----- Divide 20 from 10,000

12,500 = V₂                                                 <----- Multiply both sides by 25

True or false? the water-soluble portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group.

Answers

this answer would be true.

In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the __________; the chemical change that occurs at this electrode is called __________.

Answers

In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the cathode; the chemical change that occurs at this electrode is called reduction.

Define Electrolyte:-

An electrolyte is a material that separates into charged ions when it is in contact with water. Cations are positively charged ions. Anions are ions that are negatively charged. A substance that may conduct an electric current when melted or dissolved in water is known as an electrolyte.

Electrochemical cell

There are three main categories of electrochemical cells. the galvanic cell, the concentration cell, and the electrolytic cell. These cells all share the same four fundamental components. These are the elements

The electrolyte serves as the conduit for current flow between the anode and the cathode. In an aqueous solution, it normally is homogeneous, but in moist soil, the concentration or kind of dissolved compounds may vary locally.The anode, which can conduct electricity and is in contact with the electrolyte, corrodes when it combines with the chemicals in the electrolyte.A metal also contacts the electrolyte at the cathode. It is protected from corrosion rather than corroded.Anode and cathode are connected by the conductor, which also completes the circuit.

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Which type of molecule is shown below?

O A. Alkane

B. Cyclic alkane

C. Alkene
O
D. Alkyne

Answers

Answer:

[tex]\huge\boxed{\sf Alkene}[/tex]

Explanation:

The molecule shown is an Alkene, since:

There is a double bond between the carbon atoms.

[tex]\rule[225]{225}{2}[/tex]

PLEASE HELP !!!
Which two elements have the same number of dots around their chemical symbols in their electron dot diagrams.

Answers

The two elements have the same number of dots around their chemical symbols in their electron dot diagrams are: (C). P and As

Meaning of chemical symbols

Chemical symbol can be defined as a representation of an element using letters.

Chemical symbol are given to each element distinctively and this is an easier way to represent an element.

Some examples of chemical symbols are; O for oxygen, Zn for zinc, and Fe for iron etc.

In conclusion, The two elements have the same number of dots around their chemical symbols in their electron dot diagrams are: (C). P and As

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A solution is made by diluting 20.0 mL of propanone (C3H6O) with water. The total volume of the solution is 300 mL. What is the percent by volume of propanone in the solution

Answers

The percent by volume of propanone in the solution is  6.6 % .

Given:

Volume of solute ([tex]C_{3} H_{6} O[/tex]) = 20.0 mL

Volume of solution = 300 mL

To calculate the percent:

% by vol= (vol solute/vol of soln) x 100

             = (20mL C₃H₆O/300mL) x 100

             = 6.6 % propanone .

Therefore, the percent by volume of propanone in the solution is  6.6 %.

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A laboratory assistant needs to prepare 35.2 liters of hydrogen at 25.0°c and 101.3 kilopascals. this is the equation for the reaction: 2hcl ca → h2 cacl2 what volume of 2.3 m hydrochloric acid is required to produce this much gas? use the ideal gas resource.

Answers

Volume of hydrogen gas = 35.2L

Temperature of hydrogen gas = 25.0°C + 273 = 298 K

Pressure of hydrogen gas = 101.3 kPa = 1 atm

(Conversion factor 1 atm = 101.325 kPa)

Using the Ideal gas law,

PV = nRT

where P, V, n, R and T are pressure, volume, number of moles, universal gas constant and temperature respectively.

n = PV/RT

The number of moles of hydrogen gas,

n = 35.2 L x 1 atm/ 0.0821 L.atm.mol⁻¹1.K⁻¹ x 298 K

n = 1.438 moles

2HCl + Ca → H₂ + CaCl₂

Based on the given balanced equation, 1 mole of H₂ is produced from two  moles of HCl.

Since H₂ is 1.438 moles, HCl will be (1.438 x 2) moles or 2.876 moles

Given, Molarity of HCl = 2.3 M

Molarity = moles of solute / liter of the solution

Thus the volume of HCl is,

2.3 M = 2.876 moles / liter of the solution

V = 2.876 moles / 2.3 M

V = 1.25 L

Thus the volume of 2.3 M hydrochloric acid required to produce the given amount gas is 1.25 L.

How many H2O molecules are there in 4.5 g of water (see picture)

Answers

answer is B.
number of mole of water = 4.5/18 = 0.25mol
number of h2o molecules = 0.25 x 6.02 x 10^23 to get option B

Please help i dont have much time cause i have to give it in soon :,)
Balance the following neutralization reactions:
_______ HBr + _______ KOH _______KBr + _______H2O

_______ HF + _______ Fe(OH)3 _______FeF3 + ______ H2O

______HCl + _______ Ca(OH)2 _______CaCl2 + ______ H2O

Answers

Answer:

HBr + KOH = KBr + H2O

3 HF + Fe(OH)3 = FeF3 + 3 H2O

2 HCl + Ca(OH)2 = CaCl2 + 2 H2O

Explanation:

Hello people ~
help me with the question attached.
Thanks in advance.​

Answers

Answer:

[tex]\fbox {(2) 4.9}[/tex]

Explanation:

Applying the Ideal Gas Equation :

[tex]\boxed {PV = nRT}[/tex]

Finding n :

n = 64 g / 32 g/mole (Oxygen is diatomic)n = 2 moles

Solving for P :

P = 2 × 0.0831 × 300 / 10 (Temp. should be converted to K)P = 60 × 0.0831P = 4.9

The pressure inside the flask in bar is 4.9.

Moles of oxygen

Given mass/Molar mass64g/32g/mol2mol

Temperature=273+27=300K

Apply ideal gas equation

PV=nRTP=nRT/VP=2(0.0831)(300)/10P=4.9bar

can you help me please ​

Answers

Answer:

A. Non-metal

B. Six

C. 2

D.NA2O

E.Oxygen

Explanation:

Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen

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