..........................................................

Answers

Answer 1

Explanation:

...........................................................

Answer 2

Answer:

??????????????

Explanation:

where is your question?


Related Questions

A solid magnesium flare has a mass of 1300 g and a volume of 743 cm3. What is the density of the magnesium?

Answers

Answer:

1.74 g/cm3

Explanation:

density=mass/volume

Explanation:

density = 1300/743

or density=1.74g/cm3

HELP!!!!
four different liquid compounds in flasks at 20 C are represented above. the table below identifies the compounds. flask c shows the most particles in the vapor phase. which of the following is not shown in the model but best helps to explain why flask c must contain pentane

Answers

Answer: C , The strength of the intermolecular forces between the particles in the liquids.

Explanation:

Since we have 4 boiling flasks with liquids that are at a temp of 20⁰C and out of them all, flask C the has most amount of vapour Particles inside of it, because of that we can conclude that it has the weakest Intermolecular force out of the rest of the boiling flasks since at a temp of 20⁰C it has the most amount of gas particles compared with the other flasks, and not to forget the data in the graph shows us the formula and boiling point of flask C that contains pentane and from that data given we can tell that since the boiling point of pentane Is low then it has to have a weak intermolecular forces, causing it to have more vapour Particles than other flasks, proving the answer to be C since showing the strength of the attraction will explain everything we need to know about flask C and why does it have more vapour Particles than the other flasks.

Note:

(A) is not the answer since all the liquid particles in each flask are in random constant motion at a temp of 20⁰C so it does not justify why flask C has more vapour Particles.

(B) is not the answer since showing the relative speeds of each vapour Particle will not justify why flask C has the most amount of gas particles with the respect of its temperature.

(D) is not the correct answer since we already have data given in the graph about the boiling point of pentane and it's formula so showing the particulate representation is useless.

The best explanation is the strength of intermolecular force between the particles in a liquid. Thus option C is correct.

What is intermolecular force?

Intermolecular force is defined as the attractive and repulsive force that rises between the molecules of a compound. They are electrostatic in nature.

There are basically five type of intermolecular force.

Dipole-Dipole interactionIon Dipole interactionIon induced dipole interactionDipole induced dipole interactionDispersion force

The first three forces are collectively known as Vander wall force.

Thus, the best explanation is the strength of intermolecular force between the particles in a liquid. Thus option C is correct.

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1) A book is pushed and released and it slides across a table for a short distance The book quickly comes to a stop. The book originally has kinetic energy. To what for at
energy is the kinetic energy transformed?
A) The kinetic energy is transformed into heat
B) The kinetic energy is transformed into chemical energy
C) The kinetic energy is not transformed into any other type of energy
D) The kinetic energy is transformed into electrical energy

Answers

Answer: A the kinetic energy is transformed into heat

Explanation:

HELP ITS TIMED!!!
Refer to the pic

Answers

Answer:

3

Explanation:

We have to cancel out the electrons so multipy ionic reaction of Ag by 3 and add it to ionic reaction of Al.

What is the word equation for Sodium Hypochlorite?

Answers

Answer:

Can u phrase differently?

Answer:

If you are looking for the formula, then it is NaOCl

Explanation:

PLEASE HELP ASAP 30 POINTS!!!!




Voltage ______
Question 1 options:


causes current


pushes free electrons around a circuit


is measured in Volts


all of the choices

Answers

The answer is: D - all of the above.

Explanation:

When a voltage source is connected to a circuit, the voltage will cause a uniform flow of charge carriers through that circuit called a current.

Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light.

In brief, voltage = pressure, and it is measured in volts (V).

What are all the chemical reaction takes place if Conc HNO3 acids leaks in seawater and at what dilution ratio it gets neutralized?​

Answers

Answer:

Chemical formula: HNO₃

Melting point: −42 °C (−44 °F; 231 K)

Molar mass: 63.012 g·mol−1

Solubility in water: Miscible

Explanation:

When Conc HNO3 acid leaks into seawater presumed to be largely consisting of Sodium Chloride and other dissolved salts, I won't consider it as a chemical reaction rather it is a Physical Change. I presume this activity as a mixture when the acid been the solute becomes a contaminants

A student wants to perform an experiment to study the relationship between the temperature and pressure of an enclosed gas. In one or two sentences, describe two assumptions that must be made in performing this experiment.(2 points)

Answers

An assumption that must be made when studying the relationship between pressure and temperature is that the gases do not interact with each other.

An experiment seeks to understand the effect of one variable on the other. The relationship between the pressure and temperature of a gas is commonly studied.

In an experiment to determine the relationship between temperature and pressure of a gas, the following assumptions must be made;

The gases molecules only occupy only a negligible volume compared to the total volume of the gas.The gas molecules do not interact with each other.

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why can't plants photosynthesise in winter and drought​

Answers

Answer:

Because there is no water and they restore their food.

Explanation:

Like their glucose and that's why they also the leaf changes color

2AlCl3 --> 2Al + 3Al2

If you produce 15 moles of Al, how many grams of AlCl3 decomposed?

Answers

Answer:

1597,5 gm AlCl3 decomposed

Explanation:

2AlCl3 --> 2Al + 3Al2 If you produce 15 moles of Al, how many grams of AlCl3 decomposed? ​

FIRST, you need to write down the the correct reaction.  Your equation makes no sense

here is the correct question

2AlCl3 --> 2Al + 3Cl2    If you produce 15 moles of Al, how many grams of AlCl3 decomposed?

for every mole of Al produced, we decomposed a mole of ​AlCl3

so we produced 15 moles of Al, so we decomposed 15 moles of AlCl3

15 moles are 15 X 106.5 = 1597,5 gm AlCl3 decomposed

when chlorine gains an electron to have 8 valence electrons and become stable, will it increase, decrease or stay the same in terms of the atomic radius

Answers

Answer:

It becomes an ion

Explanation:

The element it took from becomes a positive ion

And chlorine becomes a negative ion

A 23.6 g sample of an unknown gas occupies a volume of 12.0 L at standard temperature and pressure. What is the molecular mass (molar mass) of this gas?

Answers

The molecular mass (molar mass) of this gas is equal to 44.08 g/mol.

Given the following data:

Mass = 23.6 gramsVolume = 12.0 LitersStandard temperature = 273 KStandard pressure = 1 atm.

To calculate the molecular mass (molar mass) of this gas, we would use the ideal gas law equation;

[tex]PV=\frac{MRT}{MM}[/tex]

Where;

P is the pressure.V is the volume.M is the mass of substance.MM is the molar mass of a substance.R is the ideal gas constant.T is the temperature.

Making MM the subject of formula, we have:

[tex]MM = \frac{MRT}{PV} \\\\MM = \frac{23.6\times 0.0821 \times 273}{1 \times 12}\\\\MM = \frac{528.95}{12}[/tex]

Molar mass, MM = 44.08 g/mol.

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What is the empirical formula of a compound that is 27.3% carbon, 9.10% hydrogen and 63.6% nitrogen by mass?

Answers

Explanation:

Mass ratio C : H : N = 27.3 : 9.10 : 63.6

Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14

( Divide the mass ratio by their molar masses to find the ratio between moles)

Mole ratio = 2.275 : 9.10 : 4.54

= 2.275/2.275 : 9.10/2.275 : 4.54/2.275

= 1 : 4 : 2

Answer is CH4N2

The empirical formula of a compound is [tex]CH_4N_2[/tex]

What is an Empirical Formula?

The empirical formula of a chemical compound is defined as the simplest whole number ratio of the atoms present in a compound.

The empirical formula of a compound defines the simplest ratio of the number of different atoms present. The molecular formula gives the actual number of each different atom present in a molecule. The molecular formula is mainly used which is a multiple of the empirical formula.

Molecular Formula  = n × Empirical Formula

For above given example,

Mass ratio C : H : N = 27.3 : 9.10 : 63.6

Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14

( We divide the mass ratio by their molar masses to find the ratio between moles)

Mole ratio = 2.275 : 9.10 : 4.54 = 2.275/2.275 : 9.10/2.275 : 4.54/2.275

= 1 : 4 : 2

Thus, the empirical formula of a compound is [tex]CH_4N_2[/tex]

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how long does it take cream cheese to get to room temperature?

Answers

Since cream cheese has such a high fat content, it doesn't take long to come to room temperature if the room is relatively warm. It takes about thirty minutes on the counter to soften significantly, and about an hour to fully come to room temperature again, depending on the temperature outside and in your kitchen

A compound contains 9.50 moles of carbon, 9.60 moles of hydrogen and 2.38 moles of sulfur. The molar mass of the compound is 168 grams per mole. What is the empirical and molecular formula of the compound?​

Answers

Answer :

C4H4S and C8H8S2

Q: Arrange the element according to the increase radius or size
1. Na, K, Cs Fr, Rb
2.  Ca, Sr, Ba, Ra, Mg

Answers

Answer:

Refer to the periodic table to do this.

Explanation:

1. Na, K, Cs Fr, Rb

  Sodium, Potassium, Cesium, Francium, Rubidium

  3, 4, 6, 7, 5

Ascending order: Na, K, Rb, Cs, Fr

2. Ca, Sr, Ba, Ra, Mg

   Calcium, Strontium, Barium, Radium, Magnesium

   4, 5, 6, 7, 3

Ascending Order: Mg, Ca, Sr, Ba, Ra

When doing the electronic configuration of the elements, count how many number of divides it has. For example, Na(Sodium) has 11 electrons and it is divided like this: 2,8,1. So it divides into 3 parts so there will 3 shells for sodium.

Hopefully this helps!!

Kinetic energy is described as

Question 1 options:

Movement


Decreasing energy


Stored energy


Elastic

Answers

I’m pretty sure it’s movement, but I’m not 100%

Answer:

its the movement because kinetic energy means moving not stopping or decreasing

Explanation:

Proteins have two main secondary structures: _______, which are spirals formed by hydrogen bonds between amino acids, and _______, which are formed by a bend in the amino acid with alternating hydrogen bonding between amino acids.

Answers

Answer:

Explanation:

Proteins have two main secondary structures: alpha helices, which are spirals formed by hydrogen bonds between amino acids, and beta pleated sheets, [ which are formed by a bend in the amino acid with alternating hydrogen bonding between amino acids.

how many electrons does Fe-55 have

Answers

Iron-55 (55Fe) is a radioactive isotope of iron with a nucleus containing 26 protons and 29 neutrons.

Answer:

54

Explanation:

yep

in a voltaic cell, in which direction do electrons flow?

Answers

The electrons always flow from the anode to the cathode. The half-cells are connected by a salt bridge that allows the ions in the solution to move from one half-cell to the other, so that the reaction can continue.

Elabore el balance de la ecuación por oxido reducción enumerando cada paso
CaC2O4 + KMnO4 + H2SO4 → CaSO4 + MnSO4 + K2SO4 + CO2 + H2O

Answers

Answer:

[tex]{ \rm{5CaC _{2}O _{4(aq)}+ 2KMnO _{4(aq)} + 8H _{2} SO _{4(aq)} → 5CaSO _{4(s)}+ 2Mn SO _{4(aq)}+ K _{2} SO _{4(s)} + 10CO _{2(g)} + 8H _{2} O _{l} }}[/tex]

Explanation:

This is a redox reaction formed by combining two half equations.

Check the image above, sorry if my handwriting is poor :(

why would someone need to find the relative density of an object?

Answers

Answer:

The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.

Explanation:

Hope it helps!

The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.

This principle is fundamental to understanding why objects float or sink in fluids and are commonly observed in everyday situations. For example, ships and boats float on water due to their design and the distribution of weight, while heavy materials like metal sink in water because their density is greater than that of water.

Therefore, The concept of relative densities and buoyancy has significant applications in various fields, including shipbuilding, architecture, swimming, and understanding the behavior of objects in liquids.

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are diamonds and graphite made from the same element

Answers

Answer:

Graphite and diamond are two of the most interesting minerals. They are identical chemically – both are composed of carbon (C), but physically, they are very different. Minerals that have the same chemistry but different crystal structures are called polymorphs.

Calculate the normality of a solution made by diluting 12 g of H3PO4 with water to produce 250.0 mL of solution.

Answers

The  normality of a solution made by diluting 12 g of H3PO4 with water to produce 250.0 mL of solution is 1.47 eq/L.

The normality of a solution is;

N = Mass of solute in grams/volume of solution in litres × Equivalent weight

Mass of solute =  12 g

volume of solution =  250.0 mL or 0.25 L

Equivalent weight = Molar mass of H3PO4/n

n = Number of hydrogen ions in H3PO4

Equivalent weight = 98 g/mol/3 = 32.7

Substituting values;

N = 12/0.25 ×  32.7

N = 1.47 eq/L

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How many molecules are there in 3.1 mol CO2

Answers

Answer:

Abs : 1.8662 × 10^24

Explanation:

1 mol of CO2 contains 6.02 × 10^24 molecules

So, 3.1 mol of CO2 contains 6.02 × 10^24 × 3.1 mol = 1.8662 × 10^24

What type of bond would be formed between hypothetical elements X and Y in the the compound XY based on their electronegativity difference?
A. Nonpolar covalent because the difference in electronegativity is greater than 0.4, but less than 1.7
B. Nonpolar covalent because the difference in electronegativity is greater than 1.7
C. Polar covalent because the difference in electronegativity is greater than 0.4, but
less than 1.7
D. lonic because the difference in electronegativity is greater than 0.4, but less than
1.7

Answers

The bond is polar covalent because the difference in electronegativity is greater than 0.4, but  less than 1.7.

Electronegativity refers to the ability of an atom in a compound to attract the electrons of the bond towards itself. It is a periodic trend that increases across the period but decreases down the group.

The electronegativity difference between the two atoms as shown in the question is 1.55. This means that the bond is polar covalent because the difference in electronegativity is greater than 0.4, but  less than 1.7.

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the chemical and mechanical processes of food breakdown are called ________.

Answers

Answer:

digestion

Explanation:

How does an electric generator work?

Answers

Answer:

A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet. ... The magnetic field will interfere with the electrons in the conductor to induce a flow of electric current inside it.

How do you know how to order an empirical formula?

Answers

Answer:

Start with the number of grams of each element, given in the problem. the mass of each element = the percent given. Convert the mass of each element to moles using the molar mass from the periodic table. Divide each mole value by the smallest number of moles calculated.


Solving Empirical Formula Problems There are two common types of empirical formula problems. Luckily, the steps to solve either are almost exactly the same. Example #1: Given mass % of elements in a compound.
A compound was found to contain 32.65% Sulfur, 65.3% Oxygen and 2.04% Hydrogen. What is the empirical formula of the compound?
1) The first step in this problem is to change the % to grams.
32.65%→32.65g of S
65.3%→65.3g of O
2.04%→2.04g of H
2) Next divide all the given masses by their molar mass.
32.65g of S/ 32gm-1 = 1.0203 moles of S
65.3g of O/ 16gm-1 = 4.08 moles of O
2.04g of H/ 1.008gm-1 = 2.024 moles of H
3) Then, pick the smallest answer in moles from the previous step and divide all the answers by that. Remember that if you calculate a number that is x0.9 round to the nearest whole number
1.0203 moles of S/ 1.0203 = 1
4.08 moles of O/1.0203 = 3.998 ≈ 4
2.024 moles of H/1.0203 = 1.984 ≈ 2
4) Lastly, the coefficients calculated in the previous step will become the subscripts in the chemical formula.
S = 1
O = 4
H = 2
H2SO4
Example#2: Given the mass of a reactant before a chemical reaction and the mass of a product after a reaction.
When 0.273g of Mg is heated in a Nitrogen (N2) environment a chemical reaction occurs. The product of the reaction is 0.378g . Calculate the empirical formula.
1) In any empirical formula problem you must first find the mass % of the elements in the compound. Since the total mass of the final product was 0.378 we find that:
0.378g total-0.273g magnesium = 0.105g nitrogen
0.105g nitrogen/0.378g total (100) = 27.77%
0.273g magnesium/0.378g total (100) =72.23%
2) Then change the % to grams
27.77%→27.77g of N
72.23%→72.23g of Mg
3) Next, divide all the masses by their respective molar masses.
27.77g/14gm-1 = 1.98 moles N
72.23g/24.31gm-1 = 2.97 moles Mg

Which group has the maximum number of valence electrons attainable?

Answers

Answer:

group 18

Explanation:

Elements with the most valence electrons are in group 18

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