How many atoms of each element are in one molecule of 2-heptanone

Answer:

D) The electrons move around the nucleus in an electron cloud

Explanation:

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Answer:

Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

Answer:

- Adding protons changes the identity of the atom, adding one moves from the right to left on the Periodic Table.

Answer:

B.

City residents will have adequate health care and hospital services.

Explanation:

the correct answer for edg 2020

Answer:

B

Explanation:

Answer:

E = 21.22 ×10⁻³⁶ J

Explanation:

Given data:

Energy of photon = ?

Frequency of photon = 3.2×10⁻² Hz

Solution:

Formula:

E = hf

h = 6.63×10⁻³⁴ Js

Now we will put the values in formula.

E = 6.63×10⁻³⁴ Js × 3.2×10⁻² Hz

E = 21.22 ×10⁻³⁶ J    (Hz= s⁻¹)

Answer:

mushroom

Explanation:

Answer:

Adhesion

Explanation:

Water is soaked up by a paper towel because the forces of adhesion exceeds the forces of cohesion.

The forces of adhesion binds the water molecule to the paper towel while the forces of cohesion binds the water molecules to each other.

Adhesion of water to the walls of the paper exerts an upward force that draws water molecules up the paper.

Hence, the movement of water up a paper towel occurs when the forces of adhesion to the walls of the paper is greater than the forces of cohesion acting between the water molecules.

The chemical family that the element iodine should belong to is halogen.

The following information related to the halogen is:

Therefore we can conclude that the chemical family that the element iodine should belong to is halogen.

Learn more: brainly.com/question/13145357

Answer:

C

Explanation:

the rest are trends except for Electronegativity

the equation balanced is

3 PbI4 + 4 CrCl3 → 3 PbCl4 + 4 CrI3

Answer:

3,4,3,4

Thank me later!

Explanation:

Answer:

0.417 J/gºC

Explanation:

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

Heat (Q) absorbed = 2500 J

Mass (M) of substance = 100 g

Initial temperature (T1) = 10 °C

Final temperature (T2) = 70 °C

Specific heat capacity (C) =?

Next, we shall determine the change in temperature (ΔT). This can be obtained as follow:

Initial temperature (T1) = 10 °C

Final temperature (T2) = 70 °C

Change in temperature (ΔT) =?

Change in temperature (ΔT) = T2 – T1

Change in temperature (ΔT) = 70 – 10

Change in temperature (ΔT) = 60 °C

Finally, we shall determine the specific heat capacity of the substance as follow:

Heat (Q) absorbed = 2500 J

Mass (M) of substance = 100 g

Change in temperature (ΔT) = 60 °C

Specific heat capacity (C) =?

Q = MCΔT

2500 = 100 × C × 60

2500 = 6000 × C

Divide both side by 6000

C = 2500 / 6000

C = 0.417 J/gºC

Therefore, the specific heat capacity of substance is 0.417 J/gºC

MW of gas : 124.12 g/mol

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

glass vessel wieight = 50 g

glass vessel + liquid = 148 ⇒ liquid = 148 - 50 =98 g

volume of glass vessel :

[tex]\tt V=\dfrac{m}{\rho}=\dfrac{98}{0.989}=99.1~ml[/tex]

An ideal gas :

m = 50.5 - 50 = 0.5 g

P = 760 mmHg = 1 atm

T = 300 K

[tex]\tt PV=\dfrac{mass(m)}{MW}.RT\\\\MW=\dfrac{m.RT}{PV}\\\\Mw=\dfrac{0.5\times 0.082\times 300}{1\times 0.0991}=124.12~g/mol[/tex]

Answer:

chemical

Explanation:

Some bronze objects tarnish to a dark brown color. Chemical properties can be identified by the changes they produce. The change of one substance into another substance is called a A piece of wood burning, an iron fence rusting, and a silver spoon tarnishing are all examples of chemical changes.

Answer: a full s and a full p sublevel

Explanation: "noble gases. They are an especially important group of the periodic table because they are almost completely unreactive, due to their completely filled outermost s and p sublevels."

Answer:

human-F

chicken-D

rabbit-E

tortoise-C

salamander-B

fish-A

Explanation:

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Answer:

D Tortoise

B Salamander

A Fish

C Chicken

F Human

E Rabbits

Explanation:

I Really have an Explanation

Answer:

taste receptor

Explanation:

Good luck :)

Answer:

a because where the air travels for example a radiator

Answer:

C.

In areas with the same altitude

Explanation:

Answer:

Flammability and oxidation of copper are both chemical properties of a substance.Chemical properties are the properties that tells us how a substance can react with others.Flammability, oxidation of copper, rusting of iron, precipitation e.t.c are chemical properties of a substance.Flammability is one important chemical property of hydrocarbons.Oxidation reaction is peculiar to copper.

Explanation:

Answer:

i am not sure but

Explanation:

b and c should be correct

Answer:b and D

Explanation:

Answer:15

Explanation:

Answer:

cnidarians, mollusks, annelids, arthropods,

Explanation:

Living organisms have been grouped using a system of classification that runs from Kingdom to Species. One of those kingdoms is KINGDOM ANIMALIA, which consists of animal species i.e. organisms that are strictly heterotrophic and eukaryotic.

The next taxa after kingdom is PHYLA. According to this question, the phyla which consists of only animals are cnidarians, mollusks, annelids, arthropods. Other options contain ferns, mosses, and flowering plants which belong to Kingdom Plantae.

Answer:

on edge its C

Explanation:

Answer:

body-centered cubic

Explanation:

:D

The nucleus is not a subatomic particle, but rather made of the subatomic particles of protons and neutrons. An electron is also a subatomic particle, but it is not found in the nucleus. There are many other subatomic particles, but your teacher probably won't go over those terms until later.

A) 4400 kj of heat released into surroundings

Reaction

C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ

Reaction exothermic( ∆H=-, released heat to surrounding) and for combustion of 1 mole of C3H8

So for two moles of C3H8, the enthalpy :

[tex]\tt -2200\times 2=-4400~kJ[/tex]

The empirical formula : C₁₁O₁₄O₃

The assumption of the compound consists of C, H, and O

mass of C in CO₂ =

[tex]\tt \dfrac{12}{44}\times 2.492=0.680~g[/tex]

mass of H in H₂O =

[tex]\tt \dfrac{2.1}{18}\times 0.6495=0.072~g[/tex]

mass of O :

mass sample-(mass C + mass H)

[tex]\tt 1-(0.68+0.072)=0.248`g[/tex]

mol of  C :

[tex]\tt \dfrac{0.68}{12}=0.056[/tex]

mol of H :

[tex]\tt \dfrac{0.072}{1}=0.072[/tex]

mol of O :

[tex]\tt \dfrac{0.248}{16}=0.0155[/tex]

divide by 0.0155(the lowest ratio)

C : H : O ⇒

[tex]\tt \dfrac{0.056}{0.0155}\div \dfrac{0.072}{0.0155}\div \dfrac{0.0155}{0.0155}=3.6\div 4.6\div 1\\\\\dfrac{11}{3}\div \dfrac{14}{3}\div \dfrac{3}{3}=11:14:3[/tex]

Answer:

wavelength

Explanation:

Answer:

Yes? Sry I’m kinda confused

Explanation:

Sry if I’m wrong

Answer:

D They have the same properties.

Explanation:

The same no. of isotopes doesnot describes because isotopes have same symbol but didderent atomic mass.

Answer:

1 : any of more than 100 substances that cannot by ordinary chemical means be separated into different substances Gold and carbon are elements. 2 : one of the parts of which something is made up There is an element of risk in surfing. 3 : the simplest principles of a subject of study the elements of arithmetic.

Explanation: