1. Which pair of elements will form an IONIC bond?

A. Phosphorus and Chlorine (P and Cl)


B. Hydrogen and Oxygen (H and O)


C. Sodium and Chlorine (Na and Cl)


D. Carbon and Oxygen (C and O)

Answer:

1st one

Explanation:

Answer:

B

Explanation:

chlorine 2×3= 6 not sure

Hydrophobic colloids option b- can be stabilized by adsorption of ions.

Hydrophobic colloids are colloidal particles that repel water molecules and tend to aggregate or coagulate in aqueous solutions. To stabilize hydrophobic colloids, surfactants or stabilizing agents are added to the system.

These surfactants have hydrophobic and hydrophilic regions that can adsorb onto the surface of the colloidal particles, forming a protective layer that prevents their aggregation. This adsorption of surfactant molecules on the particle surface is commonly referred to as "stabilization by adsorption of ions".

The surfactant molecules adsorb onto the particle surface with their hydrophobic tails pointing inward towards the particle surface and their hydrophilic heads pointing outward towards the solvent, creating a stable colloidal dispersion. This stabilization mechanism is commonly used in the formulation of emulsions, suspensions, and other colloidal systems.

learn more about colloidal particles here:

https://brainly.com/question/11640006

#SPJ4

Answer:

As a rough rule, five pounds of dry ice will turn from a solid to a gas in 24 hours. It's best to pick up the block of ice just a few hours before your party so it's as frozen as possible when the bash starts.

Explanation:

Answer:

98 g

Explanation:

Start with the balanced equation. Then, make a little chart under the equation showing the information you have and need.

        3O₂(g) + 4Al(s)  →  2Al₂O₃(s)

m        ?           110 g

M      ___       ____

n       ___ <=  ____

"m" is for mass. "M" is for molar mass (some teachers use "MM"). "n" is for the number of moles.

To find the mass of oxygen:

To find molar mass, use the atomic mass on your periodic table. For each atom of an element, add on its atomic mass.

Molar mass of aluminum (one Al atom):

\(M_{Al} = 26.982 g/mol\)

Molar mass of oxygen (two O atoms):

\(M_{O_{2}} = 16.000g/mol+16.000g/mol\)

\(= 32.000g/mol\)

Update the chart:

               3O₂(g)       +          4Al(s)          →     2Al₂O₃(s)

m                ?                        110 g

M      32.000 g/mol       26.982 g/mol

n                ___         <=      ____

Find the moles of aluminum

\(n_{Al} = \frac{110g}{1} *\frac{1mol}{26.982g}\)    Multiply mass by molar mass to find moles.

\(n_{Al} = \frac{110}{1} *\frac{1mol}{26.982}\)       The units "g" cancel out.

\(n_{Al} = 4.0(7)mol\)        Keep one extra significant figure. (110 has 2 sig. figs.)

               3O₂(g)       +          4Al(s)          →     2Al₂O₃(s)

m                ?                        110 g

M      32.000 g/mol       26.982 g/mol

n                ___         <=   4.0(7) mol

Find the moles of oxygen using the mole ratio, which comes from the coefficients in the balanced equation.

The mole ratio of oxygen to aluminum is 3 to 4.

\(n_{O_{2}} = \frac{4.0(7)mol_{Al}}{1}*\frac{3mol_{O2}}{4mol_{Al}}\)     Multiply moles of aluminum by the mole ratio.

\(n_{O_{2}} = \frac{4.0(7)}{1}*\frac{3mol_{O2}}{4}\)             "molAl" units cancel out.

\(n_{O_{2}} = 3.0(52)mol_{O2}\)              Keep two sig. figs. when the first is a "5"

               3O₂(g)       +          4Al(s)          →     2Al₂O₃(s)

m                ?                        110 g

M      32.000 g/mol       26.982 g/mol

n          3.0(52) mol   <=    4.0(7) mol

Find the mass of oxygen

\(m_{O_{2}} = \frac{3.0(52)mol}{1}*\frac{32.000g}{1mol}\)        Multiply moles by molar mass.

\(m_{O_{2}} = \frac{3.0(52)}{1}*\frac{32.000g}{1}\)             The "mol" unit cancels out.

\(m_{O_{2}} = 97.(6)g\)                         Keep one sig. fig. to round. "6" rounds up.

\(m_{O_{2}} = 98g\)                               <= Final answer

∴ 98 grams of oxygen are required to completely react with 110 grams of aluminum.

Explanation:

This is because the hydrogen bonding in water H2O is stronger than that is hydrogen sulfide H2S.

Answer:

The combustion will release -3,321 KJ/mol of energy

Explanation:

What we need to do here is to first calculate the number of moles of methane burnt.

Mathematically, the number of moles of methane burnt = mass of methane/molar mass of methane

Molar mass of methane = 16g /mol

Thus the

number of moles will be ;

59.7/16 = 3.73 moles

Now, 1 mole of methane produces -890 KJ/mol if energy

Then the energy produced by by 3.73 moles of methane would be 3.73 * 890 = -3,320.8125

which is approximately -3,321 KJ/mol

Kindly note that the amount of heat is negative because it is an exothermic reaction

Answer:

Forces holding atoms together in a compound are called chemical bonds and An atom that has a net positive charge is called a cation

Explanation:

Answer:

I LOVE THIS OMG

Answer: His cells use oxygen to break down food molecules to release energy

Explanation:

Answer:B

Explanation:

Answer:

D) Use the appropriate fire extinguisher

Explanation:

stay safe my friend :)

Given that ionization constant of water (Kw) at 40°C is 2.9x10^-14 .

We need to calculate H3O+, OH-, pH and pOH for pure water at 40°C.

The ionization of water can be given as:

2H2O ⇌ H3O+ + OH-Kw = [H3O+][OH-]

Putting the values:Kw = [H3O+][OH-]2.9x10^-14 = [H3O+][OH-]

Let [H3O+] = [OH-]= x

∴ Kw = x2∴ x = √2.9x10^-14x = 1.7x10^-7mol/L

Hence, [H3O+] = [OH-] = 1.7x10^-7mol/LpH = -log[H3O+]pH = -log(1.7x10^-7)pH = 6.7689pOH = -log[OH-]pOH = -log(1.7x10^-7)pOH = 6.7689

Therefore, pH and pOH of pure water at 40°C are 6.7689.

Learn more about ionisation constant:

https://brainly.com/question/30639622

#SPJ11

CH4 is limiting reagent and H20 remains after the reaction.

A limiting reagent is a reactant that entirely consumes itself before any other reactants are used up in a chemical reaction, hence restricting the amount of product that may be created. It can be found by comparing the proportions of each component in the reaction and its stoichiometry. Once the limiting reagent has been determined, the amount of product that can be generated can be computed using the reaction's stoichiometry.

\(CH_4+2O_2- > CO_2+2H_2O\)  

number of moles of CH4= given mass/atomic mass

=> 16/16

so the number of moles of CH4 is 1

number of moles of O2 = 64/32

=2

so CH4 1 mole get vanished after the reaction and the gases like CO2 and O2 fly away so the limiting reagent is CH4  

To know more about  limiting reagent click below:

https://brainly.com/question/11848702#

#SPJ4

14 + log(7.5 × 10⁻³) ≈

11.875

Answer:

11.875

Explanation:

Answer:

D. in Carbon dioxide released by factory's in to the atmosphere

Explanation:

hope this helps.

Answer:

I think in B drinking water supplies

or D.

Explanation:

it had to be D instead

Answer:

a. H₂(g) + Cl₂(g) ⇒ 2HCl (g)

HCl (g) + H₂O (l) ⇒ H₃O⁺ (aq) + Cl⁻ (aq)

b. 0.999 mol

Explanation:

a. Write the balanced equation for the synthesis of hydrochloric acid.  

The balanced equation for the synthesis of hydrochloric acid is thus

H₂(g) + Cl₂(g) ⇒ 2HCl (g)

HCl (g) + H₂O (l) ⇒ H₃O⁺ (aq) + Cl⁻ (aq)

b.  How many moles of chlorine are  required for the production of 72.92 g hydrochloric acid?

We need to find the number of moles of HCl contained in 72.92 g. So, molar mass M of HCl = molar mass of hydrogen + molar mass of chlorine

molar mass of hydrogen = 1 g/mol

molar mass of chlorine = 35.5 g/mol

So, molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol.

We now find the number of moles n of HCl in 72.92 g from n = m/M where m = mass of HCl = 72.92 g

n = 72.92 g/36.5 g/mol = 1.998 mol.

From the balanced chemical equation, 1 mol of chlorine atoms produces 2 moles of hydrogen chloride gas. Therefore, the number of moles of chlorine atoms produces 1.998 mol HCl or 72.92 g HCl is 1 mol × 1.998 mol/2 mol = 0.999 mol

Answer:

bjbjbjbjbhjhgytuvbgtbgygutf

Explanation:

Answer:

3 Electron shell/orbit

Explanation:

the number of shell an element has is what determines the period of that element.

The approximate speed of the satellite, expressed to the correct number of significant figures, is approximately 7.6 km/s.

The correct answer is B. 7.6 km/s.

To convert the speed of the satellite from miles per hour to kilometers per second, we need to use the conversion factors provided.

Given:

Speed of the satellite = 17,000 miles/hour

One kilometer = 0.62 mile

One hour = 3,600 seconds

To convert miles to kilometers, we can use the conversion factor:

1 mile = 1.60934 kilometers

To convert hours to seconds, we can use the conversion factor:

1 hour = 3,600 seconds

Now, let's calculate the speed of the satellite in kilometers per second:

Speed in kilometers per hour = 17,000 miles/hour * 1.60934 kilometers/mile = 27,358.78 kilometers/hour

Speed in kilometers per second = (27,358.78 kilometers/hour) / 3,600 seconds/hour ≈ 7.6 kilometers/second

Therefore, the approximate speed of the satellite, expressed to the correct number of significant figures, is approximately 7.6 km/s.

The correct answer is B. 7.6 km/s.

To know more about approximate speed click this link -

brainly.com/question/3376375

#SPJ11

Answer:

noun. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. a region or area characterized by a given climate: to move to a warm climate.

Explanation:

Based on the balanced reaction equation, 9 moles of carbon dioxide are formed when 3 moles of propane are combusted.

From the balanced reaction equation we can see that 3 moles of carbon dioxide are formed upon the combustion of a single mol of propane:

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

These molar ratios are constant and enable us to set up a simple proportion:

1 mol of propane : 3 mol of carbon dioxide = 3 mol of propane : X

X = 3 mol of carbon dioxide * 3 mol of propane / 1 mol of propane

X = 9 mol of carbon dioxide

You can learn more about balanced reaction equations here:

brainly.com/question/22064431

#SPJ4

Answer: The answer is 0.5 M AIN

Answer:

They live in the open snow

Explanation:

Explanation:

All of that visible trail of radiation, especially in the form of gamma rays—the extremely energetic cousins of ordinary light. Astronomers have known for three decades that brilliant flashes of these rays, called gamma-ray bursts, arrive daily from random directions in the sky. Recently astronomers have pinned down the location of the bursts and tentatively identified them as massive supernova explosions and neutron stars colliding both with themselves and black holes. But even now nobody knows much about what goes on when so much energy is flying around. Matter grows so hot that it interacts with radiation in unfamiliar ways, and photons of radiation can crash into each other and create new matter. The distinction between matter and energy grows blurry. Throw in the added factor of magnetism, and physicists can make only rough guesses about what happens in these hellish settings. Perhaps current theories simply aren’t adequate to explain them.

Using Bohr's equation for the energy levels of the electron in the Hydrogen atom, determine the energy in J of an electron in the n=4 level.

According to Boh'rs equation we can calculate the energy using this equation:

En = - 2.18 * 10⁻¹⁸ J / (n²)

So if we want to find the energy we only have to replace n by 4 and solve that calculation:

since n = 4

En = - 2.18 * 10⁻¹⁸ J / 4²

En = - 2.18 * 10⁻¹⁸ J / 16

En = -1.36 * 10⁻¹⁹ J

So the answer is option D

The mass of olive oil : 690 g

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

\(\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}\)

ρ = density  

m = mass  

v = volume  

Given

volume of olive oil = V=750 ml

density of olive oil = ρ = 0.92 g/ml

Required

the mass of olive oil

Analysis

the formula :

\(\tt m=\rho\times V\)

Solution

\(\tt m=0.92\times 750\\\\m=690~g\)

Paraphrase

the mass of olive oil : 690 g

There are two main ways to calculate the concentration of a solution: molarity and percent concentration. Molarity is the number of moles of solute per liter of solution, while percent concentration is the amount of solute per 100 parts of solution.
the concentration of a solution is valuable because it allows for accurate and precise measurements in chemical reactions and experiments. For example, if a scientist needs to create a solution with a specific concentration, they must know how much solute to add to the solvent in order to achieve the desired concentration.

Additionally, knowing the concentration of a solution can help determine the appropriate dilution or concentration needed for a specific application or use. Overall, understanding concentration is crucial for accurately preparing and using solutions in scientific and industrial settings.

To know more about moles visit:

https://brainly.com/question/30885025

#SPJ11

Answer:

7178.22 mL

Explanation:

Applying,

PV = P'V'................. Equation 1

Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.

make V' the subject of the equation

V' = PV/P'.............. Equation 2

From the question,

Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa

Substitute these values into equation 2

V' = (2250×290)/90.9

V' = 7178.22 mL

Explanation:

Question 1

Ans : D

Question 2

Ans: D

hope it helps!

Answer:

1) \(\huge\boxed{\sf D}\)

2) \(\huge\boxed{\sf D}\)

Explanation:

Question 1:

BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)

[------Reactants--------------]     [--------Products---------]

The reactants are in aqueous form as written in the reaction.

Question 2:

This reaction is a synthesis reaction as a new product is formed from reactants that are totally different from each other.

\(\rule[225]{225}{2}\)

Hope this helped!