A car covers a distance of 22.75 km in 17.04 minutes. Use dimensional analysis to calculate its speed in meters/second. Do not enter units in your answer.
Round to the tenths place or further.

Answer:

They have two valence electrons and enter into reactions where they can donate their two valence electrons

Explanation:

Here, we want to predict the number of valence electrons

The elements belong to the group 2 of the periodic table

Elements in the periodic table are placed in groups based on the number of valence electrons they have

It is expected that elements in group 2 of the periodic table have 2 valence electrons

Their reactivity is that, they react with other atoms by donating this two valence electrons. They then achieve the electronic configuration of the noble gas in the last period

The statements wrong about cathode rays is none of the given option. All the given option is true about the cathode rays.

The statements for the cathode rays is given as :

A. They travel in straight lines towards cathode. This statement is true about the cathode rays.

B. They produce heating effect. This statement is true about the cathode rays.

C. They carry negative charge. This statement is true about the cathode rays.

D. They produce X-rays when strike with material having high atomic masses. This statement is true about the cathode rays.

Thus, none of the option is incorrect about the cathode rays.

To learn more about cathode rays here

https://brainly.com/question/26500956

#SPJ4

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 15.8 cm³

density = 3 g/cm³

We have

mass = 3 × 15.8

We have the final answer as

Hope this helps you

Answer:

just watch the video, what does it start with, write that down for each trial, then what does it end with, then starting mass - ending mass is the change mass

Answer:

T° freezing solution = -22.8°C

Explanation:

To solve this problem we apply, the Freezing Point Depression. This is a colligative property which its formula is:

T° freezing pure solvent - T° freezing solution = Kf . molality . i

i = Van't Hoff factor.

We have been informed is a nonionizing solute, so i = 1

Our solute is ethylene glycol, so le'ts determine the moles to get molality

388 g . 1 mol / 62.07 g = 6.25 moles

molality (m) = moles of solute /kg of solvent

We convert mass of solvent, water, to kg → 510 g . 1kg /1000g = 0.510 kg

6.25 mol /0.510kg = 12.25 m

We replace at formula → 0°C - T° freezing solution = 1.86°C/m . 12.25 m . 1

T° freezing solution = -22.8°C

In this question, we need to find the value of pressure of a 15 grams sample of CO2 gas, and in order to find this value, we will be using the Ideal gas law formula, which is the following:

PV = nRT

Where:

P = pressure in atm

V = volume in liters, 20 Liters

n = number of moles

R = gas constant, 0.082

T = temperature in kelvin, 0°C = 273 K

The number of moles we need to find based on the mass in the question and based on the molar mass of CO2, 44g/mol:

44g = 1 mol

15g = x moles

44x = 15

x = 15/44

x = 0.34 moles of CO2 in 15 grams

Now we have the values to add to the formula:

P * 20 = 0.34 * 0.082 * 273

20P = 7.61

P = 7.61/20

P = 0.38 atm of pressure

The pressure will be 0.38 atm

The greater the electronegativity difference between two bonded atoms, the greater the ionic character of the bond. Option B.

The electronegativity difference between two bonded atoms determines the bond polarity. It is calculated by subtracting the electronegativity of the less electronegative atom from that of the more electronegative atom. Bond polarity can range from nonpolar covalent to polar covalent to ionic.

The greater the electronegativity difference between two bonded atoms, the greater the ionic character of the bond. If the electronegativity difference between the bonded atoms is greater than 1.7, the bond is ionic. The bond is polar covalent if the electronegativity difference is between 0.4 and 1.7, and it is nonpolar covalent if the electronegativity difference is less than 0.4.

Bonding character is determined by the electronegativity difference between two bonded atoms. The more electronegative an element is, the more it pulls electrons toward itself. As a result, electronegative atoms acquire a partial negative charge, whereas less electronegative atoms acquire a partial positive charge.

As a result, the bond between them is polarized. The bond is classified as covalent if it is polarized and the bond is classified as ionic if the electronegativity difference between the atoms is quite significant.

To learn more about ionic, click here:

https://brainly.com/question/14614762

#SPJ11

The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )

To determine the atom we will have to determine the molar mass of the atom

Applying De Broglie equation

λ = h / mv

Vrms = \(\sqrt{\frac{3RT}{M} }\)  ---- ( 1 )

Where : λ  = 2.31 * 10⁻¹¹,  R = 8.314 J / k.mol,  T = 373 K, h = 6.626 * 10⁻³⁴ J.s

From equation ( 1 )

M = ( h² Ua ) / 3RT*λ² --- ( 2 )

where : Ua ( mass of an atom ) = 6.022 * 10²³,  h = 6.626 * 10⁻³⁴,  R = 8.314 J / k.mol, λ  = 2.31 * 10⁻¹¹,    T = 373 K

Insert values into equation ( 2 )

M ( molar mass ) = 32 g/mol

Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.

Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).

Learn more about sulphur : https://brainly.com/question/26328290

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

To know more about moles and molecules,

https://brainly.com/question/29367909

The correct option for the process used to refine aluminum from its bauxite ore is option D.

D. Smelting

The reason why smelting is the correct choice is as follows;

Bauxite is the aluminum ore from which alumina, also known as aluminum

oxide, Al₂O₃, is produced. Bauxite is extracted from the topsoil regions of

some subtropical and tropical regions, and the Bayer process is primarily

then used to produce alumina from the bauxite.

Aluminum is produced from the alumina by an aluminum smelting process

known as the Hall—Heroult electrolytic process which involves the use of a

carbon anode and direct current to produce aluminum by reducing the

aluminum oxide

Learn more about smelting process here:

https://brainly.com/question/3444206

Answer:

They use the pH scale

Explanation:

The strong acid and strong base has high rate constant of dissociation. Weak acid and base are the one whose rate constant for the dissociation is low, they do not dissociate readily in water. Scientist use pH scale to classify substances that are either an acid or a base.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base are the solution which releases hydroxide ion OH⁻ ion when dissolved in water. . At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

The pH of acid is between 0-7 on pH scale. acid turns blue litmus paper to red. Acids have sour taste and corrosive nature. Mathematically the concentration of hydrogen ion can be calculated using this formula

Mathematically,

pH=-log[H⁺]

Therefore, scientist use pH scale to classify substances that are either an acid or a base.

To know more about acid and bases, here:

https://brainly.com/question/27228111

#SPJ2

Answer:

10.81 amu

Explanation:

The average atomic mass of Boron can be calculated as follows :

\(A=19.9\%\ \text{of}\ 10.01294 +80.1\%\ \text{of}\ 11.00931\\\\A=\dfrac{19.9}{100}\times 10.01294 +\dfrac{80.1}{100}\times 11.00931\\\\A=10.81\ \text{amu}\)

So, the average atomic mass of boron is 10.81 amu.

The correct answer is A. 129 kj heat is required to decompose 25.5 grams of NaHCO3.

The heat of reaction, also known as enthalpy change, can be calculated using the equation: ΔH = n × ΔHf (where ΔHf is the heat of formation and n is the number of moles of the substance). The heat of decomposition of sodium bicarbonate (NaHCO3) can be calculated using the equation: ΔH = 2 × ΔHf (Na2CO3) + ΔHf (H2O) - ΔHf (NaHCO3). The heat of formation values can be found in standard reference tables, and the number of moles can be calculated from the given mass of 25.5 grams of NaHCO3. By substituting these values into the equation and solving, the heat of reaction for the decomposition of 25.5 grams of NaHCO3 is 129 kj.

Learn more about sodium bicarbonate:

brainly.com/question/8560563

#SPJ4

Answer:

D

\( \: \: \: \: \)

Answer:

protons

Explanation:

hjejdjkdndknfodjdodjbdld

The first two quantum numbers for the electrons located in subshell 4d is n=4,l=2

For n = 4, l = 2

Here, n represents the principal quantum number

The d in 4d represents d orbital as determined by the secondary quantum number (l).

The quantum number l tells us the shape of the orbital.

l = 0     s orbital

l = 1      p orbital

l = 2     d orbital

To learn more about qunatum numbers visit:

brainly.com/question/16977590

#SPJ9

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

To learn more about sustainability, here

https://brainly.com/question/32771548

#SPJ4

Answer:

is a way of presenting information about the chemical proportions of atoms

Explanation:

Answer:

K₅Mn₅O₁₆

Explanation:

From the question given above, the following data were obtained:

Potassium (K) = 27.5 %

Manganese (Mn) = 37.5 %

Oxygen (O) = 35 %

Empirical formula =?

The empirical formula for the compound can be obtained as follow:

K = 27.5 %

Mn = 37.5 %

O = 35 %

Divide by their molar mass

K = 27.5 / 39 = 0.705

Mn = 37.5 / 55 = 0.682

O = 35 / 16 = 2.188

Divide by the smallest

K = 0.705 / 0.682 = 1

Mn = 0.682 / 0.682 = 1

O = 2.188 / 0.682 = 3.2 = 32/10 = 16/5

K = 1

Mn = 1

O = 16/5

Multiply by 5 to express in whole number

K = 1 × 5 = 5

Mn = 1 × 5 = 5

O = 16/5 × 5 =16

Thus, the empirical formula for the compound is K₅Mn₅O₁₆

The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.

Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.

In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.

Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.

Learn more about lattice energy from the given link:

https://brainly.com/question/29735933

#SPJ11

Answer: ... potassium citrate, potassium chloride, and potassium with dextrose and sodium chloride. Potassium atom is an alkali metal atom.

Explanation:

Lithium alkali metals has the highest electronegativity. An atom's ability to attract the electrons of a bond grows with electronegativity, a feature of an atom.

The electrons in a covalent bond are shared evenly by two bound atoms if their electronegativity levels are the same. Typically, the more electronegative atom attracts the electrons in a chemical bond more so than the other one. Consequently, a polar covalent bond is created. The electrons aren't shared at all if the electronegativity values are significantly dissimilar. Ionic bonds are created when one atom essentially steals the other atom's bond electrons.

Over a period, electronegativity often increases as it moves from left to right. The noble gases frequently defy this rule.

Moving down on the periodic table often results in a decrease in electronegativity.

To know more about Ionic bonds visit

https://brainly.com/question/9075398

#SPJ4

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

15660.712J

Explanation:

Q = m × c × del T

Q(energy) = ?

m (mass) = 98.5g

c = 4.184J

del T = 75-37 = 38 °C

Q = 98.5 × 4.184 × 38

Q = 15660.712 J

The decomposition of wastewater can lead to the following:

II. Eutrophication and algal blooms.

III. The development of dead zones.

A wastewater can be defined as a body of water that has been contaminated due to human use in homes, offices, schools, businesses etc.

Ideally, wastewater should be disposed in accordance with the local regulations and standards because they typically are unhygienic for human consumption or use. Thus, floor drain are used in the kitchen, bathroom and toilet to remove wastewater, so as to mitigate stagnation and to improve hygiene.

Generally, the decomposition of wastewater can lead to the following:

Read more on wastewater here: https://brainly.com/question/17791594

When considering the length of sunshine and nighttime in various seasons, the Southern Hemisphere is experiencing winter.

The seasons are caused by Earth's tilted axis. Several regions of the Earth are exposed to the Sun's strongest rays at various times of the year. So, the Northern Hemisphere experiences summer when the North Pole tilts towards the Sun. Moreover, winter in the Northern Hemisphere occurs when the South Pole tilts towards the Sun.

Australia's seasons are the opposite of those in the northern hemisphere. The winter season runs from June to August, the spring season from September to November, and the summer season runs from December to February.

To know more about Northern Hemisphere visit:-

brainly.com/question/26841745

#SPJ1