Which element has a violent reaction when combined with cold water ?____
Base your answers to the following questions on the electron configurations below:
(A)2s1
(B)[Ar] 3d104s24p1
(C)[Kr] 4d105s25p3
(D)[Ne] 3s2
(E)[Kr]4d105s25p6

Answer:

0.184 mol

Explanation:

Look up molar masses for the elements that comprise H₃PO₄:

H = 1.008 g/mol

P = 30.97 g/mol

O = 15.99 g/mol

The molar mass of H₃PO₄ is a weighted sum of these (3 hydrogen + 1 phosphorus + 4 oxygen) that comes out to about 97.99 g/mol.

Then

(18 g H₃PO₄) × (1/97.99 mol/g) ≈ 0.1837 mol

The heat in joules is released when 25. 0 g of water (C = 4. 184 J/g°C) is cooled from 80. 0°C to 30. 0°C is -5210 J

To find the amount of heat released when a substance is cooled, we can use the equation:

q = mcΔT

where q is the amount of heat (in joules), m is the mass of the substance (in grams), c is the specific heat capacity of the substance (in joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).

Given the information in the question, we have:

m = 25.0 g

c = 4.184 J/g°C

ΔT = 30.0°C - 80.0°C = -50.0°C

So, we can substitute these values into the equation and get:

q = (25.0 g)(4.184 J/g°C)(-50.0°C)

q = -5210 J

Therefore, the amount of heat released when 25.0 g of water is cooled from 80.0°C to 30.0°C is -5210 J.

A negative sign means the heat is absorbed during the cooling process, it is an endothermic process.

Learn more about the calculation of heat transfer here: https://brainly.com/question/10670781

#SPJ4

Answer:

 SO2 and SO3 are acidic oxides that react with bases in aqueous solutions to create sulfurous acid and sulfuric acid salts as these gases dissolve in water. In aqueous solution, SO2 and SO3 react with NaOH to form Na2SO3 and Na2SO4.

Explanation:

Types of crystalline solids characterized by;

(a) high mobility of electrons throughout the solid; metallic solids.

(b) softness, relatively low melting point; covalent network solid.

(c) high melting point and poor electrical conductivity; ionic solids.

(d) network of covalent bonds; molecular solids.

Crystalline solids are those that have their atoms, ions, or molecules arranged in a regular, well-defined pattern. The unit cell is the smallest repeating pattern of crystalline solids, and unit cells are similar to bricks in a wall in that they are all identical and repeating.

Ionic solids, molecular solids, network covalent solids, and metallic solids are the four types of crystalline solids. A covalent network solid is a type of solid that has a low melting point, softness, and low electrical conduction. Metal cations are surrounded by a "sea" of mobile valence electrons in metallic crystals.

Learn more on crystalline solids here: https://brainly.com/question/12759602

#SPJ1

Answer:

the first one is the answer is to the question

Answer: C

Explanation: Basic 8- 14

Answer:

a solar eclipse is when the moon moves between the earth and the sun, so the moon casts a shadow on the earth

Explanation:

Answer:

the moon gets in the way of the sun and cast a shadow onto earth

Explanation:

The smallest measurement you can make on the meter stick using the metric scale is the millimeter.

The millimeter is the smallest measurement on the meter stick . The millimeter is the smallest reading in the meter stick. we use the meter stick to simply measure the length. The meter reading is calibrated in the centimeters in the meter scale. the least count in the meter scale is the millimeters. we can measure the things as the length of the table or the width.

Thus, the smallest measurement in the meter stick using the meter scale is the millimeters. the symbol of the millimeters is mm.

To learn more about meter stick here

https://brainly.com/question/17687457

#SPJ4

The percent composition of vanadium in the ore is 1A: 10.8%, and the percent composition of lead is 2B: 73.2%.

Vanadinite (Pb₅ (VO₄)₃Cl) = 1250 grams

Pure vanadium= 135 grams

Pure lead = 915 grams

Percent composition of vanadium =?

Percent composition of lead  =?

The formula to find the percent composition is as follows:

Percent composition =(substance mass in grams/ sample mass in grams) × 100

1: Now solving to find the percent composition of vanadium by putting values in the formula:

Percent composition of vanadium =  (vanadium mass/sample mass) × 100

Percent composition of vanadium =  (135 g/ 1250 g) × 100

Percent composition of vanadium =  10.8 %

2: Now finding the  percent composition of lead by using the same formula:

Percent composition of lead     = (lead mass/sample mass) × 100

Percent composition of lead    = (915 g / 1,250 g) × 100

Percent composition of lead    =  73.2%

"

Complete question:

What are the percent compositions of vanadium and lead?

A metallurgist begins with 1,250 grams of vanadinite (pb5(vo4)3cl) and ends up with 135 grams of pure vanadium and 915 grams of pure lead.

The percent composition of vanadium in the ore is ______ , and the percent composition of lead is ________ .

OPTIONS:

1.

A. 10.8%

B. 14.3%

C. 14.8%

D. 62.4%

2.

A. 55.6%

B. 73.2%

C. 16.0%

D. 23.8%

"

You can learn more about percent composition at

https://brainly.com/question/17021926

#SPJ4

Answer:

10.8%

73.2%

Explanation:

I just did the test and its right on  plato, Have a great a day!

Answer:

d) Hypothesis

Explanation:

I think d) Hypothesis is the correct answer for the question.

Hope it helps :)

Answer:

Explanation:

Stress causes the build up of strain, which causes the deformation of rocks and the Earth's crust. Compressional stresses cause a rock to shorten. Tensional stresses cause a rock to elongate, or pull apart.

The density of chlorine will be  3.163 g/L.

The mass of a substance per unit of volume is its density. According to Graham's law, a gas's rate of effusion is inversely proportional to its square root density. When a material's particles are concentrated in a low area, they tend to travel to the place where the concentration is highest. When we use perfume or a scented spray in one area of the room and subsequently can smell it throughout the entire space, that is a simple illustration of this process.

rate1 = H2 = 5.93

rate2 = Cl2 = 1

The molecular weight of H2 = 2.016

The molecular weight of Cl2 = x.

By Graham's Law:

5.93 / 1 = x / 2.016

35.1649 = x / 2.016

x = 70.89 g/mol

Determine gas density by volume

70.89 g / 22.414 L = 3.163 g/L

Learn more about Density

brainly.com/question/28929608

#SPJ4

Immediately rinse chemicals off with a lot of water.                                  

Different assistance must be used because different chemical accidents might occur in various ways.

To provide the person access to fresh air, remove them from the factory or work location. Make sure your company has a plan in place for what to do if a worker becomes unconscious or is unable to move. If the person has inhaled chemicals, administer oxygen from an oxygen tank.

Immediately rinse chemicals off with lots of water for at least 15 minutes. The more quickly and for a longer period of time you start to pour water over the region, the more damage you will limit. Chemicals that catch fire or absorb quickly through the skin must be washed for a longer time, 30 minutes to 1 hour.

Right away, rinse the eye or both eyes. Rinse for at least 15 minutes while using a lot of water. If you have an emergency eye wash, activate it while keeping your eyes open with your fingers. If you must use your hands to splash water in your eyes, keep them open while doing so. Seek assistance in keeping them open.

Look for the chemical label or any other relevant information. Typically, the label will provide information on "ingestion" in the first aid section. If the person should vomit up the chemical or not is determined there. It is crucial that you heed that counsel. If the chemical is consumed, the label can include an antidote. Give the remedy if you have it.

Learn more about ingestion visit:

brainly.com/question/23164645

#SPJ4

The answer is 0.01918 kilometers.

To convert from feet to kilometers,

you must first convert feet to meters. To do this, multiply the number of feet by 0.3048. In this case, 62.95 feet multiplied by 0.3048 equals 19.18 meters To convert from meters to kilometers, multiply the number of meters by 0.001. 19.18 meters multiplied by 0.001 equals 0.01918 kilometers. Therefore, 62.95 feet is equal to 0.01912 kilometers.

To review the conversion steps more closely, starting with feet and ending with kilometers:

1. Feet (62.95) to meters (19.18): Multiply by 0.3048

2. Meters (19.18) to kilometers (0.01918): Multiply by 0.001 or divide by 1000.

Therefore, 62.95 feet is equal to 0.01918 kilometers.

To learn between Feet and Kilometers:

brainly.com/question/1462592

#SPJ4

The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are volume and mass.

What is Volume?

Volume is a measure of the amount of three-dimensional space occupied by an object or substance. It is often measured in liters, cubic centimeters, or cubic meters. Volume is used to measure the capacity of a container, the size of an object, or the amount of liquid or gas in a given space. It is also used to determine the mass of an object, as the density (mass per unit volume) is often known.

The two quantities of volume and mass are important for doing dimensional analysis with chemical substances because they help to measure the amount of a substance in different units. Volume is important for measuring the quantity of liquid substances, and mass is important for measuring the quantity of solid substances. Both of these quantities are necessary for accurate and precise measurements of chemical substances, making them essential for dimensional analysis.

To know more about volume,

https://brainly.com/question/14197390

#SPJ4

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8.0 mol of CuS form when  8.0 mol CuSO[tex]_4[/tex]  reacts.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

Na[tex]_2[/tex]S + CuSO[tex]_4[/tex]→ Na[tex]_2[/tex]SO[tex]4[/tex] + CuS

moles of  Na[tex]_2[/tex]S  =9.0 mol

moles of  CuSO[tex]_4[/tex]=8.0 mol

Since CuSO[tex]_4[/tex] is limiting reagent

moles of CuS=8.0 mol

Therefore, 8.0 mol of CuS form when  8.0 mol CuSO[tex]_4[/tex]  reacts.

To know more about mole, here:

brainly.com/question/15209553

#SPJ1

False. A polypeptide will have a negative net charge at ph=0.

A peptide is a small, chemically bound chain of amino acids, usually between two and fifty amino acids (called peptide bonds). A polypeptide is a longer (51 or more amino acids) chain of connected amino acids. One or more polypeptides are used to create the proteins that are produced inside of cells.

Polypeptides. Proteins are created by joining several amino acids together to form polypeptides. The coupling of two or so more polypeptides results in the formation of proteins, after which they are folded into the appropriate shape.

To know more about Polypeptide visit:

https://brainly.com/question/28270191

#SPJ4

Answer:

B

Explanation:

For a hypothesis to be testable means that it is possible to make observations If a hypothesis cannot be tested by making observations, it is not scientific.

Answer:

0.31M is the new concentration of the solution

Explanation:

The solution is diluted from 125mL to 1.0L = 1000mL. The dilution is of:

1000mL / 125mL = 8 times.

That means the concentration of the diluted solution is 8 times lower than the original solution. That is:

2.5M / 8 times =

Answer:

TRUE

Explanation:

Standard temperature is 273K and 350°C is 623K.

V/V' = T/T'

3/6.84 = 273/T'

T' = (273×6.84)/3

=> T' = 623K

So it is true.

When molecules move faster, they increase their kinetic energy.

What is Kinetic energy?

Kinetic energy is essentially the energy of motion. It is the type of energy that an object possesses as a result of its motion. It is commonly defined as the work required to accelerate a given mass body from rest to its stated velocity. Kinetic energy is directly related to the object's mass and the square of its velocity.

This increase in kinetic energy causes the molecules to vibrate more rapidly, resulting in an increase in temperature. As molecules move faster, they also collide with each other more frequently, leading to more chemical reactions.

To know more about kinetic energy,

https://brainly.com/question/8101588

#SPJ4

The unnamed material has a molar mass of 32 grammes per mole, and it exhales 2.278 x 10-4 molecules of an unknown gas through a minute hole in 95.70 seconds.

It takes 81.60 s for 1.738 x 10 -4 mol of argon gas to effuse under the same circumstances. The definition of molar mass is the mass in grammes of a mole of a specific chemical. The term "mole" refers to any material or compound that includes the Na number of atoms, molecules, or ions, where Na is the Avogadros number and Na = 6.023 1023. A molecule's total atomic mass expressed in grammes per mole is known as its molar mass. to figure out a molecule's molar mass

R1/R2 equals (M2/M1)1/2 2.38*10-6/2.1299*10-6 = sqrt(40/M1).

40 M1/M1 = 1.25 M2/M2 = 32 gm/mole

Learn more about molar mass here

https://brainly.com/question/12127540

#SPJ4

Answer:

152.12

Explanation:

hope it helps

Kong Mali po sorry

3 grams of Cu = 6.022 x 10^23 atoms of copper.

Answer:

2.84 × 10^22 atoms

Explanation:

To calculate the number of atoms in 3 grams of Cu, we can use avogadro's constant where:

[tex]1 \: mole = 6.02 \times 10 {}^{23} \: atoms[/tex]

Firstly, we have to calculate the number of moles in 3 grams of Cu. The formula to calculate moles is:

[tex]moles = \frac{mass}{molar \: mass} [/tex]

the mass = 3g and the molar mass = 63.55 (this value can be found in the periodic table)

Substitute the values in formula:

[tex]moles = \frac{3}{63.55} [/tex]

[tex]moles = 0.0472[/tex]

Now use the number of moles to convert to atoms using avogadro's number, where x is the unknown number of atoms we want to find:

[tex]1 \: mole : 6.02 \times 10 {}^{23} \: atoms[/tex]

[tex]0.0472 \: moles : x \: atoms[/tex]

Cross multiply and equate to solve for x:

[tex]1 \times x = 6.02 \times 10 {}^{23} \times 0.0472[/tex]

[tex]x = 6.02 \times 10 {}^{23} \times 0.0472[/tex]

[tex]x = 2.84 \times 10 {}^{22} \: rounded \: to \: 3sf[/tex]

Hence, there are 2.84 × 10^22 atoms in 3 grams of Cu

Considering the feedback loop that occurs when you quickly remove your hand away from something hot, this reflex helps to maintain homeostasis by ensuring that the body is free from danger and thus maintains the internal condition of the body.

The stable internal, external, and chemical conditions that are maintained by living systems are known as homeostasis. In order for the organism to function at its best, a number of factors, including body temperature and fluid balance, must be maintained within predetermined ranges.

The body's reflexes help to maintain homeostasis in the body such as heart rate, breathing rate, blood pressure, and digestion.

Some reflexes that maintain homeostasis in the body include:

Learn more about homeostasis and reflexes at: https://brainly.com/question/6636638

#SPJ1

alright, sum leaves have large air pockets inside that allow the plant to absorb oxygen from the water from rain or puddles

Answer:

Plant adaptations are modifications that enable a plant species thrive in its natural habitat. Underwater aquatic plants have enormous air pockets in their leaves that allow them to collect oxygen from the water. Aquatic plants' leaves are also incredibly delicate, allowing them to move with the waves.

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, the concentration of sulfate ion is 1.15 M.

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

K₂SO₄[tex]\rightarrow[/tex]2K⁺ + SO₄²⁻

concentration of potassium sulfate=concentration of potassium ion=concentration of sulfate ion

1.15 M =concentration of potassium ion=concentration of sulfate ion

Therefore, the concentration of sulfate ion is 1.15 M.

Learn more about Molarity, here:

https://brainly.com/question/16727614

#SPJ1

The relative standard deviation (RSD) for this set of data is 9.98.

The enthalpy change that occurs when 1 mole of a substance burns (combines vigorously with oxygen) under standard state conditions is known as the standard enthalpy of combustion also known as the heat of combustion. The enthalpy of combustion of ethanol, for instance, is 1366.8 kJ/mol.

Total = -5182.6 - 5181.9 - 5183.5 - 5180.1 - 5184.2

Total = -25912.3

number of items = 5

mean = total sum / number of items

mean = -25912.3/5

mean = -5182.46

[tex]x_{i}[/tex]                        [tex]x_{i}[/tex]-µ                           ([tex]x_{i}[/tex]-µ)²

-5181.6                0.86                         0.7396

-5181.9                 0.3                           0.09

-5181.5                 -0.1                           0.01

-5181.1                  -0.5                          0.25

-5181.2                 -0.4                           0.16

∑ ([tex]x_{i}[/tex]-µ)² = 1.2496

Standard deviation = √∑ ([tex]x_{i}[/tex]-µ)² /x

Standard deviation = √1.2496/5

Standard deviation = 0.499

Relative standard deviation = S x 100/x

Relative standard deviation = 0.499 ×100/5

Relative standard deviation = 9.98

To know more about enthalpy visit:

https://brainly.com/question/13996238

#SPJ4