How many grams of magnesium(Mg, 24.30 g/mol) are in 7.43×10^22 atoms Mg?

Answer:

As the pH value is less than 7, (in this case 5,94) it corresponds to an acidic substance.

Explanation:

The pH indicates the acidity or basicity of a substance. pH values between 0 and less than 7 indicate acidic solutions, 7 neutral and higher than 7 to 14 basic. It is calculated as: pH = -log (H 30+)

First we calculate the concentration of H 30+:

Both pH and pOH have a relationship to belonging to the same aqueous solution: the expression of the Kwater (ionic product of the water Kw) is used:

(H3O  +) x (OH  -) = 1x10 ^ -14

(H3O  +) x (8.8 x 10^-9)= 1x10 ^ -14

(H30+)= 1x10 ^ -14/(8.8 x 10^-9)

(H30+)= 1,14 x 10^-6 M

pH= -log (H30+)

pH= -log (1,14 x 10^-6)

pH=5,94  As the pH value is less than 7, it corresponds to an acidic substance.

Answer:

monoxide

dioxide

trioxide

tetroxide

pentoxide

hexoxide

heptoxide

octoxide

nonoxide

Explanation:

Just the way it is. If there is an -a or -o infront of the oxide(or another substance that starts with vowel), the a is often dropped.

Answer:

B

Explanation:

Population size is the number of individuals in a population.

Population density is the average number of individuals per unit of area or volume.

Answer:

The pressure will be 4, 5 atm

Explanation:

We use Boyle Mariotte's formula: for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally:

P1xV1=P2xV2

P2= (P1xV1)/V2 = (1,5 atm x 6 L)/2 L=4,5 atm

Answer:

1025.05

Explanation:

1calories=4.184 joulse

so if multiply 245 by 4.184

The calculation of energy from calories to joules is determined below:

One Joule may be defined as the amount of energy that is significantly required to be exerted when a force of one newton is put in an application over a displacement of one meter.

The calorie may be defined as the amount of heat needed at a pressure of 1 atm in order to enhance that temperature of 1 gram of any solution by 1°C.

According to the question,

The total amount of calories = 245.

As per the common calculation or conversion factors,

1 calorie ≅ 4.2 Joules.

∴ 245 calories = 245 × 4.2 = 1029 Joules.

Therefore, according to the calculation, the total amount of energy in 245 Calories is equal to 1029 joules.

To learn more about Joules, refer to the link:

https://brainly.com/question/490326

#SPJ2

Answer:

the answer is A

Explanation:

According to the law of conservation of energy or the first law thermodynamics energy neither be created nor destroyed, energy is transferred from one form to another form.

When a 200°C iron bar is placed in thermal contact with a 30°C block of wood then, energy leaves the iron bar and enters the wood until the temperatures are equal. Option A is correct.

According to the law of conservation of energy, energy will not be created or destroyed, but it can be transferred from one object to the another object or transformed into a different forms.

When a 200°C iron bar is placed in thermal contact with a 30°C block of wood, heat energy will transfer from the higher-temperature iron bar to the lower-temperature wood until both objects reach thermal equilibrium (i.e., until their temperatures become equal). This is based on the principle that heat flows from hotter objects to colder objects in an attempt to reach equilibrium.

Hence, A. is the correct option.

To know more about law of conservation of energy here

https://brainly.com/question/28711001

#SPJ2

Answer:

Sound energy is a form of energy that can be heard by humans.

Ex- buzzing bee, balloon popping

Explanation:

Answer:

The answer to the question is deposition

Deposition is the natural processes added sediments, soil, rocks, or other Earth debris to landforms. Hence option b is correct.

Decomposition is defined as the procedure by which decomposed organic materials are converted into more basic organic or inorganic compounds such carbon dioxide, water, simple sugars, and mineral salts. The process of decomposition is intricate. Nitrogen and carbon dioxide are the mineral forms of nutrients that are produced during the breakdown of organic materials.

The geological process of deposition involves the addition of sediments, soil, and rocks to a landform or landmass. Previously weathered surface material is carried by wind, ice, water, and gravity. When enough kinetic energy in the fluid is lost, it is deposited, creating layers of sediment.

Thus, deposition is the natural processes added sediments, soil, rocks, or other Earth debris to landforms. Hence option b is correct.

To learn more about decomposition, refer to the link below:

https://brainly.com/question/8009068

#SPJ2

Answer:

A

Explanation:

they pull apart if u see the first one they go like this < > leaving a gap in the middle

In type A of plate boundary, a trench will most likely to form ocean trenches are caused by tectonic activity, which is the movement of the Earth's lithosphere, hence option A is correct.

Oceanic trenches are long, narrow, noticeable topographic depressions on the ocean bottom. They are normally 50 to 100 kilometers broad and 3 to 4 kilometers below the surrounding marine bottom, but can stretch for thousands of km.

Ocean trenches, in particular, are a hallmark of convergent plate boundaries, when two or more tectonic plates collide.

Learn more about ocean trenches, here:

https://brainly.com/question/20714510

#SPJ2

Answer:

0.21M of C3H5O(COOH)3

Explanation:

Molarity = no of mole/ volume of solution

Molar mass of C3H5O (COOH)3 = 192.12g

No of mole of C3H5O (COOH)3 = 141.6/192.12 = 0.74mol

1000mL = 1L

3500mL = 3.5L

Molarity = 0.74/ 3.5 = 0.21M of C3H5O (COOH)3

Answer:

0.2M

Explanation:

The molarity of a solution is given by;

M = number of moles / volume

Number of moles = mass/molar mass

Mass of Citric acid = 141.6g

Molar mass of citric acid = (6×12)+(8×1)+(7×16)

= 72+8+112=192g/mol

Number of moles of citric acid=141.6/192=0.74mol

Volume = 3500.0 mL = (3500/1000)L=3.5L

Molarity of the solution = 0.74mol/3.5L=0.2mol/L

Therefore, 0.2mol/L or 0.2M concentration is prepared by dissolving 141.6 g of citric acid, C3H5O(COOH)3, in 3500.0 mL of water

Answer:

A. Sometimes the coefficient for the oxygen molecule is not a whole number

Explanation:

The correct answer is option  A. Sometimes the coefficient for the oxygen molecule is not a whole number.

Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.

Balancing combustion reactions is easy. First, balance the carbon and hydrogen atoms on both sides of the equation. Then, balance the oxygen atoms.

Learn more about What happens to hydrocarbon in a combustion reaction?   here:  https://brainly.com/question/7582344

#SPJ2

Answer: The forward and reverse reactions eventually reach the same rate.

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.

The equilibrium is dynamic in nature and the reactions are continuous in nature. Rate of forward reaction is equal to the rate of backward reaction and it appears as it has stopped.

Answer:b a

Explanation:

Answer:

Scientists don't actually measure astronomical distances in light years. Rather, they measure them in a unit called the Parsec , and only convert to light years when they're talking to the general public . One light-year is the distance light travels through space in one year.

Explanation:

Answer:

106,080 newtons per meter squared

Explanation:

First you take the density of mecury multiply by the height in meters then multiply by the gravity: 13600×0.02×10= 2720

Then add the answer to the standard atmospheric presssure:

2720+ 103,360= 106,080

The study of chemicals and bonds is called chemistry.

The correct answer is 106,080N/s

First, we have to multiply the mercury by the height to find the density. The density is as follows:-

[tex]13600*0.02*10= 2720[/tex]

We have to convert the density into standard atmospheric pressure:

[tex]2720+ 103,360= 106,080[/tex]

Hence, the correct answer is 106080N/s

For more information, refer to the link:-

https://brainly.com/question/13899929

Answer: The Molarity of the sulphate ion in a 2M  [tex]K_2SO_4[/tex] solution is 2M

Explanation:

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n= moles of solute

[tex]V_s[/tex] = volume of solution in ml

[tex]K_2SO_4\rightarrow 2K^{+}+SO_4^{2-}[/tex]

Now as 1 mole of [tex]K_2SO_4[/tex] gives = 1 mole of [tex]SO_4^{2-}[/tex]

2 moles of [tex]K_2SO_4[/tex] gives =[tex]\frac{1}{1}\times 2=2[/tex] moles of [tex]SO_4^{2-}[/tex]

Thus Molarity of the sulphate ion in a 2M [tex]K_2SO_4[/tex] solution is 2 M

Answer&Explanation:

According to dilution law concentration before dilution is equal to concentration after dilution hence;;

Volume×molarity(before)=volume×molarty(after)

345ml×1.5M=?M×250ml

Cross multiplication

Molarity will be equal to 2.07M

Hey there!

Your answer is B. Intramolecular; intermolecular.

Intramolecular forces are the forces that keep the atoms together in the molecule.

Intermolecular forces are the forces that are different molecules interacting with each other.

You can remember this by thinking about the prefixes inter- and intra-. Inter- refers to open systems within groups. The groups are the different molecules which are interacting with each other.

Intra-, however, refers to the closed system inside of a single group. The single group is the one molecule, and the interactions are happening between the atoms within the molecule.

Hope this helps!

Answer:

D  

Explanation:

5,778K

Answer:red

Explanation:

The stars can be classified in many ways, including by mass, color, and temperature. The color and the temperature of a star are usually related.

Antares is a red supergiant.

Answer:

endothermic reaction.

Explanation:

An increase in the temperature of a system at equilibrium favors the backward or reversible reaction.

According to the equilibrium law, when any external stress is applied at the equilibrium state then the equilibrium will shift to that side which decreases the external affect.

Suppose a chemical reaction which is exothermic in nature will be represented as:

A + B ⇄ C + D

If we increases the temperature then reaction will shift to the left side to overcome the effect of increased temperature.

Hence reversible reaction proceeds on increasing the temperature.

To know more about equilibrium law, visit the below link:
https://brainly.com/question/2943338

Answer:ThE aNsWeR iS B

Explanation: The earth was one a big ocean but than volcanoes explode and that created land :)

If you're hiking in the mountains and you find shells by accident, you know that the mountain was once under the sea. Therefore, the correct option is option B.

A mountain is indeed an elevated area of the crust of the Earth, typically with steep - sided that reveal a substantial amount of bedrock that has been exposed. Although variations exist, a mountain is normally taller than a hill, rising as least 300 meters (1,000 feet) just above surrounding ground.

Most mountains are found in mountain ranges, while a handful have solitary peaks. Tectonic forces, erosion, and volcanism, which operate on time spans as long as tens of millions of years, are responsible for the formation of mountains. You look for shells when you visit the beach. However, if you're hiking in the mountains and you find shells by accident, you know that the mountain was once under the sea.

Therefore, the correct option is option B.

To learn more about mountain, here:

https://brainly.com/question/1131219

#SPJ6

Answer:

pH = 1

Explanation:

pH = - log [1.0*10(^-1) ]= 1

Answer:

1.61 × 10⁶ kJ

Explanation:

The human burns energy so as to be healthy.

The amount of energy burnt per day by an adult human is 2 × 20³ kcal per day. Since there is 24 hours in a day, the amount of energy burnt per hour is 2 × 20³ × 24 = 48 × 20³ kcal per hour.

The conversion rate of kcal to kJ is 1 kcal = 4.184 kJ. Therefore converting the kcal per hour to kJ per hour gives:

48 × 20³ × 4.184 = 200.882 × 20³ kJ = 1.61 × 10⁶ kJ

Final answer:

Rate in kJ per hour = 34.93 kJ/hTo convert the rate from kcal per day to kJ per hour, you can multiply the average daily energy burn by the conversion factor of 4.184 kJ/kcal and 1 day/24 hours.

Explanation:

To convert kcal to kJ, we can multiply by a conversion factor of 4.184.

Therefore, to find the rate in kJ per hour, we can multiply the average daily energy burn by the conversion factor for both kcal to kJ and hours to days.

The calculation would be:

Rate in kJ per hour = (2.00x10³ kcal/day) x (4.184 kJ/kcal) x (1 day/24 hours)

The rate in kJ per hour = 34.93 kJ/h

54.03 moles of gas were left the next morning, assuming the temperature and volume of the tank stayed constant.

Explanation:

Status of the oxygen gas at night or initial conditions.

volume of the tank = 70 litre

temperature = 27 degree celsius or 300.15 K

pressure = ?

number of moles of oxygen = 119

R = 0.0821 L atm/mole K

applying gas law

PV = nRT

P = [tex]\frac{0.0821 X 119.4 X 300.15}{70}[/tex]

P  = 42 atm

in the morning

volume  = 70 litres

temperature = 300.15 K

Pressure = 19 atm

n = ?

R =  0.0821 L atm/mole K

Applying  Ideal Gas law,

PV= nRT

putting the values in the formula:

n = [tex]\frac{19 X 70}{0.0821 X 300.15}[/tex]

 n  = 54.03 moles will be left in the morning.

Answer:

I beleive this should help you find ur answer The molecular mass of Aluminum Oxide is approximately 102 grams per mole. 105.9 g Al were burned in excess O2 to produce 200.0 g Al2O3

Explanation:

Answer: malaria

Explanation:

Answer:

malaria

Explanation:

B.

mass equal to that of a proton; negative charge