Part A
Determine the number of protons in each of the following isotopes of chr
Enter your answers numerically separated by commas.
DVI Aed
2
?
Cr – 50, Cr – 52, Cr – 53 Cr – 54 =
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Answer:

im pretty sure its b. sand and iron

ik that magnetism easily separates iron

Answer:

n=N/Na

----. N=nxNa=3x6.023x10^23=1.8069e+24

Answer: m= 58.8 g Kr

Explanation: solution attached:

Find first the number of moles for Kr.

Use Ideal gas law formula PV= nRT and derive for n.

Convert moles to mass using the molar mass of Kr.

Answer:

mol H2S = 1.28 mol

Explanation:

balanced reaction:

∴ moles HCl = 2.56 mol

⇒ moles H2S = ?

⇒ moles H2S = (2.56 mol HCl)*(mol H2S/2 moles HCl)

⇒ moles H2S = 1.28 mol

The increase in pressure will result in the decrease of the total number of gas molecules due to the shift in equilibrium toward the side with fewer moles of gas, following Le Châtelier's principle.

According to Le Châtelier's principle, how will a pressure increase affect a system that includes matter in the gas phase and another phase? The correct answer is D. The total number of gas molecules will decrease. This is because Le Châtelier's principle states that a pressure increase will shift an equilibrium toward the side of the reaction with the fewer number of moles of gas, as this helps to counteract the change by reducing the pressure within the system. This principle is particularly useful when predicting how a change in pressure will affect the position of equilibrium in a chemical reaction involving gases.

Final answer:

Le Châtelier's principle indicates that increased pressure in a gaseous reaction shifts equilibrium toward the side with fewer gas molecules to reduce the stress caused by the pressure increase.

Explanation:

According to Le Châtelier's principle, a pressure increase in a system involving gases will cause a shift in equilibrium towards the phase with the fewer number of gas molecules. In the case of a reaction with different numbers of gas molecules on each side of the reaction, such as 2NO(g) + O₂(g) ⇒ 2NO₂(g), an increase in pressure would shift the equilibrium towards the formation of NO₂, since it has fewer gas molecules (2) compared to the reactants (3). This phenomenon occurs because the system responds to reduce the pressure by favoring the production of fewer molecules that would occupy less volume.

Answer:

The sample of nitrogen must be taken to 267 C

"An advertisement for a commercial hand warmer claims that the hand warmer works because a chemical reaction in the hand warmer draws out the body’s own natural heat causing a warming effect"

Explanation:

Hand warmer

        A) Crystalline type

        B) Air activated

        C) Lighter

        D) Battery

        E) Charcoal

Answer:

false

Explanation:

Answer:

pumice and gneiss

Explanation:

both are formed by conduction of energy

Answer:

metals? I'm not 100% sure, sorry if I'm wrong.

Answer:

1.0511458x10^22

Explanation:

0.633 mol/ 1 x 6.022x10^23/1 mol

The human use of coal impacts air and water quality significantly. The burning of coal results in air pollution, contributing to global health and environmental issues. Additionally, processes related to coal use also contaminate local water bodies, damaging aquatic ecosystems and affecting the safety of drinking water.

The human use of coal has significant impacts on both air and water quality. When coal is burned for energy, it releases pollutants, including sulfur dioxide and nitrogen oxides into the atmosphere. These substances can lead to air pollution, contributing to issues like acid rain, smog, respiratory diseases, and global warming.

Coal mining and combustion also affect water quality. Acid mine drainage, where water in coal mines becomes acidic and leaks out, can contaminate local water bodies, harming aquatic life and making the water unsafe for human consumption. Moreover, coal-fired power plants often discharge waste materials containing heavy metals like mercury into water bodies, further deteriorating water quality.

https://brainly.com/question/32849086

#SPJ2

Answer:

3.95 oz

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

Apple iPhone = 112 g

Step 2: Identify Conversions

1 lb = 454 g

1 lb = 16 oz

Step 3: Convert

[tex]112 \ g(\frac{1 \ lb}{454 \ g} )(\frac{16 \ oz}{1 \ lb} )[/tex] = 3.94714 oz

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

3.94714 oz ≈ 3.95 oz

Final answer:

The weight of an Apple iPhone can be calculated by converting the mass from grams to pounds and then from pounds to ounces which results in approximately 3.94 ounces.

Explanation:

To find the weight of an Apple iPhone in ounces, we can use the conversion factors provided. Given that 1 pound (lb) is equal to 16 ounces (oz) and 1 pound (lb) is equivalent to 454 grams (g), we can convert the mass of the iPhone from grams to pounds and then from pounds to ounces.

First, convert the mass of the iPhone from grams to pounds:

112 g ÷ 454 g/lb = 0.246 lb

Next, convert the mass in pounds to ounces:

0.246 lb × 16 oz/lb = 3.9376 oz

Therefore, the weight of the Apple iPhone is approximately 3.94 ounces.

Answer:

4,270 Joules

Explanation:

The heat of fusion of water is 334 j/g. So, the equation would be (12.8 g)(334 j/g) which comes to 4,270 joules.

Written out that's just twelve point eight times three hundred and thirty four.

To melt 12.8g of ice at 0 degrees Celsius, one would need 4275.2 joules of energy. This is calculated by multiplying the mass of the ice (12.8g) by the heat of fusion for ice (334 J/g).

To determine how many joules are required for melting 12.8g of ice at 0 degrees Celsius, we should use the known heat of fusion for ice. The heat of fusion of ice is 334 J/g, which is the amount of energy needed to convert 1 gram of ice at its melting point into 1 gram of water at the same temperature without changing its temperature.

The calculation is straightforward:

In this case:

Energy required = 334 J/g × 12.8 g = 4275.2 J

Therefore, 4275.2 joules of energy are required to melt 12.8g of ice at 0 degrees Celsius.

Answer:

12.371

Explanation:

pH of a 0.0235 M HCl solution is;

pH = -log[H+ ] = -log(0.0235) = 1.629

pOH = 14.000 – pH = 14.000 – 1.629 = 12.371

Taking into account the definition of pH and pOH, the pOH of a 0.0235 M HCl solution is 12.37.

In first place, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically, pH is expressed as the negative base 10 logarithm of the hydrogen ion concentration:

pH= - log [H⁺]= -log [H₃O⁺]

A strong acid is an acid that ionizes almost completely in aqueous solution, so the concentration of protons equals the concentration of the acid.

Being HCl a strong acid, then

[HCl]= [H⁺]= [H₂O⁺]= 0.0235 M

Then, the pH of the solution is:

pH= -log (0.0235 M)

pH= 1.63

On the other hand, pOH is a measure of the concentration of hydroxyl ions in a solution. The following relationship can be established between pH and pOH:

pH+ pOH= 14

In this case:

1.63 + pOH= 14

Solving:

pOH= 14 - 1.63

pOH= 12.37

Finally, the pOH of a 0.0235 M HCl solution is 12.37.

Learn more about:

Answer:

You can do three experiments and take the average result.

Explanation:

Repeating an experiment establishes two things: reproduciblity and repeatability. These are two different but connected terms.

Reproducibility: This refers to the degree of agreement in the results conducted by different individuals at different locations using different instruments. The experiments are subject to many conditions such as temperature, humidity, human error, instrument error etc.

Repeatability on the other hand, is a measure of how repeatable an experiment is by using same instruments. In other words, the experiment must be replicated elsewhere and still generate the same results or close to that.

To establish the either of the two, three experiments will be sufficient. This means that for the results, there will be a lower value, middle value, and upper value.

The average result is a combination of the results and divided by the number of experiments, in this case, 3.

One advantage of doing 3 experiments is that you get a quick representative of how the results are.

Answer: 3.25x10²⁴ atoms Zn

Explanation: Convert moles of Zn to atoms using Avogadro's number

5.4 moles Zn x 6.022x10²³ atoms Zn/ 1 mole Zn

= 3.25x10²⁴ atoms Zn

Yo sup??

The correct answer is option B ie

both living and non living things.

Hope this helps

The correct answer is that both living and nonliving things are made of matter. The correct option is: both living and nonliving things.

Living organisms and inanimate objects alike are composed of matter. Essentially, matter is the "stuff" that constitutes everything in existence. Anything that occupies space and has mass qualifies as matter, which consists of various chemical substances.

Therefore, the accurate answer to the question "What is made of matter?" encompasses both living and nonliving entities. This includes everything from the air we breathe to the earth beneath our feet, the food we consume, and our own bodies.

For example, the chair you're sitting on and the meal you had for lunch are both made of matter. Matter, defined as anything that has mass and takes up space, includes all tangible objects in the universe, whether living or nonliving.

Answer:

                     284.88 grams of CO₂

Explanation:

Data Given:

                  Volume  =  V  =  145 L

                  Standard Temperature  =  T  =  273.15 K

                  Standard Pressure  =  P  =  1 atm

                  Universal Gas Constant  =  R  =  0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹

                  Moles  =  n  =  ??

Formula Used:

                         Assuming that the CO₂ gas is acting ideally we will apply Ideal Gas equation;

                                P V  =  n R T

Solving for n,

                               n  =  P V / R T

Putting values,

                n  =  1 atm × 145 L / 0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹ × 273.15 K

                n  =  6.47 mol

Secondly, Moles are converted to Mass as;

Moles  =  Mass / M.Mass

Solving for Mass,

Mass  =  Moles × M.Mass

Mass  =  6.47 mol × 44.01 g/mol

Mass =  284.88 grams of CO₂

Answer: m= 1.02x10² g AlCl3 or 1091.3 g AlCl3

Explanation: solution attached.

Convert mass of Mg to moles

Do the mole ratio between Mg and AlCl3 based from the balanced equation.

Convert moles of AlCl3 to mass using its molar mass.

Answer: A

both permanent magnet and electromagnets.

i hope that helps

Final answer:

A permanent magnet can affect both other permanent magnets and electromagnets, as well as metals such as iron and nickel. It cannot attract non-metals like plastic or wood and can also exert a force on charged particles when they are in motion.

Explanation:

The question concerns the effects a permanent magnet can have on various objects and fields, particularly addressing what a permanent magnet can affect. A permanent magnet can affect both other permanent magnets and electromagnets by exerting a magnetic force on them. Magnets can also affect objects made of materials that are attracted to magnets, such as iron and nickel. These materials are typically metals, not non-metals like plastic or wood, which do not respond to magnetic fields.

Furthermore, a magnetic field can exert a force on charged particles, such as electrons, when they are in motion. This is a fundamental principle of electromagnetism, a branch of physics that studies the interaction between electricity and magnetism. Consequently, the correct answer to the question is that a permanent magnet can affect both permanent magnets and electromagnets.

Answer:

                    49.52 g of H₂O

Explanation:

                    The balance chemical equation for given reaction is as follow;

                                  4 HCl + O₂ → 2 H₂O + 2 Cl₂

Step 1: Find out Limiting reagent as;

According to balance equation,

                    4 moles of HCl reacted with  =  1 mole of O₂

So,

                5.50 moles of HCl will react with  =  X moles of O₂

Solving for X,

                     X =  5.50 mol × 1 mol / 4 mol

                     X =  1.375 moles of O₂

This means to completely consume 5.5 moles of HCl we will need 1.375 moles of O₂ while, we are provided with 3.0 moles of O₂ which is in excess hence, the limiting reagent in this problem is HCl and it will control the yield of products.

Step 2: Calculate Moles of H₂O produced;

According to balance equation,

                    4 moles of HCl produced  =  2 moles of H₂O

So,

                5.50 moles of HCl will react with  =  X moles of H₂O

Solving for X,

                     X =  5.50 mol × 2 mol / 4 mol

                     X =  2.75 moles of H₂O

Step 3: Calculate Mass of H₂O as;

                Mass  =  Moles × M.Mass

                Mass  =  2.75 mol × 18.01 g/mol

                Mass =  49.52 g of H₂O

Answer:

Lead (/ˈlɛd/) is a chemical element with the symbol Pb

Answer:

It stays àt 80j

Explanation:

The total energy of the isolated system remains 80 J as the gravitational potential energy is converted into kinetic energy in a frictionless environment, maintaining conservation of energy.

As the box slides down the frictionless slide, the total energy of the system remains constant due to the conservation of energy principle. The initial 80 J of gravitational potential energy is progressively converted into kinetic energy as the box moves down the slide. Since the slide is frictionless, there are no dissipative forces like friction to convert mechanical energy into heat. Hence, the isolated system, which includes the box, slide, and earth, will still store 80 J of total energy, but in different forms (mostly kinetic energy when the box is at the bottom of the slide).

Answer:

moles of H2O = 4.5 mol

Explanation:

balanced equation:

∴ mass SnO2 = 339 g

∴ molar mass SnO2 = 150.71 g/mol

⇒ moles SnO2 = (339 g)(mol/150.71 g) = 2.25 mol SnO2

⇒ moles H2O = (2.25 mol SnO2)(2 mol H2O/mol SnO2)

⇒ moles H2O = 4.5 mol H2O

Answer:

             The structure of Ethambutol is attached below. As it can be seen in structure that there are three different atoms which can act as a central atom and hence, can make a geometrical shape. These three atoms are;

(i) Carbon (Tetrahedral):

                Each carbon atom in this compound is Sp³ hybridized because there is no double or triple bond in this compound. So, according to VSEPR theory the four bonded atoms will keep a maximum distance from each other to experience less repulsion. Therefore, the bond angle about carbon atom will be 109.5° and the shape will be Tetrahedral.

(ii) Nitrogen (Trigonal Pyramidal):

                 There are two atoms of Nitrogen in this compound. These Nitrogen atoms are bonded to three atoms. Also, it has one lone pair of electron. This pair of electron will cause the the bond between the atoms to decrease due to more repulsion hence making the bond angle less than 109.5° and giving a Trigonal Pyramidal shape.

(iii) Oxygen (Bent / Angular):

                 The two oxygen atoms are bonded to two atoms and contain two lone pair of electrons, hence, more repulsion and more small angle i.e. 104° giving a bent or angular shape.

Double displacement reaction:

A double replacement or displacement reaction, the process in which two compounds react and interchange positive cations and negative anions of two reagents, and created two new forms of compounds or products.

Conditions:

A feature of this is that two compounds are reagents and two various compounds are products.

Production of insoluble precipitate

           [tex]A g N O_{3}(a q)+N a C l(a q) \rightarrow A g C l(s)+N a N O_{3}(a q)[/tex]

Production of an insoluble gas

          [tex]N a_{2} S(a q)+2 H C l(a q) \rightarrow 2 N a C l(a q)+H_{2} S(g)[/tex]

Production of water

         [tex]H N O_{3}(a q)+K O H(a q) \rightarrow K N O_{3}(a q)+H_{2} O(l)[/tex]

Examples:

An example is the reaction between silver nitrate and sodium chloride. Silver converts a nitrite ion to a sodium chloride ion, and sodium absorbs a nitrate anion.

           [tex]A g N O_{3}+N a C l \rightarrow A g C l+N a N O_{3}[/tex]

Also, other example as below

           [tex]\mathrm{CuCl}_{2}(a q)+2 A g N O_{3}(a q) \rightarrow C u\left(N O_{3}\right)_{2}(a q)+2 A g C l(s)[/tex]

There are two equivalent ways to maintain a double displacement equation: cation exchange or anion exchange.

Answer:

Water

Explanation:

one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient temperature and pressure. Which is known to be crystal blue.

Answer:

well I t could be in liquid form or in air form

Explanation:

Answer:

option a is answer

Explanation:

suppose we take an example of sodium chloride is always used in medicines

Answer:it’s b

Explanation: trust meh Brodie