Answer:
see below
Explanation:
1. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.
2. solid, liquid, gas
3. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
4. The forces strengthen, and the molecule structure becomes more rigid.
5. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.
The the degree of intermolecular interaction between molecules determines the magnitude of boiling point of the substance.
During phase change, a substance moves from one state of matter to another. The temperature at which a phase change occurs is determined by the strength of the forces between molecules in the substance. The relative magnitude of intermolecular forces between molecules in different states of matter is solids > liquids > gases.
During boiling, energy is imparted to the molecules of a liquid. When this occurs, the forces between water molecules break, and the bonds between the atoms in water are unchanged.
We must recall that the molecules of a substance are in constant random motion. The average kinetic energy of molecules is proportional to temperature. As a sample of calcium carbonate is cooled, the forces between molecules strengthen, and the molecule structure becomes more rigid.
The magnitude of intermolecular interaction affects the boiling point of a liquid. The stronger the magnitude of intermolecular interaction,the higher the boiling point. As such, ethanol having hydrogen bonds between its molecules has a higher boiling point than acetone which only posses weaker dipole - dipole interactions.
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Hydrocarbons (alkanes, alkenes, alkynes) have all the properties below except one.
Which is not a property of hydrocarbons?
A.nonpolar
B.high melting and boiling points
C.insoluble in water
D.flammable
Answer:
B
Explanation:
The answer is B. All hydrocarbons are nonpolar, they are insoluble in water and they are highly flammable. Now, not all hydrocarbons have high boiling and melting point. For example, methane (CH4) has a boiling point of something clode to -161°C, and that is low. The boiling point increases when the number of carbon atoms in a compound increases, and based on methane and this theory, not all hydrocarbond have a high boiling point. This makes option B be the correct answer.
NEED ANSWER ASAP!!
A mining company is looking for ways to save money on the process they use to discover new mineral resources while also reducing the impact that the mining process has on the environment.
Which improved technology would
best achieve this goal?
O fracking
O drilling technology
O extraction technology
O geological Surveying
Answer:
extraction technology.....
HELPP PLEASE
this is a weird place to ask but does anyone know a good physical science experimental project that the scientific method can be used on? with homemade materials that doesn’t take more than 2 days to do?
Experiment: Does it Dissolve?
Materials Needed:
4 clear, glass jars filled with plain tap waterFlourSalt Talcum or baby powderGranulated sugarStirrerStep 1: Form a question before starting the experiment.
Step 2: Make a hypothesis for each substance.
Step 3: Scoop a teaspoon of each substance in the jars, only adding one substance per jar. Stir it up!
Step 4: Observe whether or not each substance dissolves and record the findings.
Fusion is a type of _____.
chemical reaction
nuclear reaction
physical reaction
Answer:nuclear reaction
Explanation: Nuclear fusion is a type of nuclear reaction where two light nuclei collide together to form a single, heavier nucleus. Fusion results in a release of energy because the mass of the new nucleus is less than the sum of the original masses.
Fusion is the process that powers the sun and the stars. It is the reaction in which two atoms of hydrogen combine together, or fuse, to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy.
Imagine that scientists have just discovered a non-bird dinosaur skeleton. They want to know whether the dinosaur was closely related to birds. What features in ...
might help them decide?
Answer:
This evidence includes fossilized bones, teeth, eggs, footprints, teeth marks, and even dung. When paleontologists compare a skeleton of a living bird to the fossilized skeleton of a non-bird theropod, like Sinornithosaurus, they see many similarities.
Explanation:
Answer:
When people think of dinosaurs, two types generally come to mind. There were the huge herbivores,
like Apatosaurus, with their small heads and long tails. There were also those fearsome carnivores,
like Tyrannosaurus rex, that walked on two legs and had a mouthful of teeth like kitchen knives.
Living Dinosaurs
These large dinosaurs are no longer around, but dinosaurs still live among us today. They are the
birds. It's difficult to imagine that a bird on your window sill and a T. rex have anything in common.
One weighs less than a pound. The other was the size of a school bus, tipping the scales at eight
tons. But for all their differences, the two are more similar than you might think. In fact, birds and T.
rex are close relatives. They all belong to a group of dinosaurs called theropods.
This is a cladogram, a "" showing the relationships among organisms. The group called dinosaurs includes the extinct dinosaurs
and all their living descendants. All its members, including living birds, descended from the very first dinosaur-their common ancestor.
That's why birds are a kind of dinosaur (just as humans are a kind of primate).
Skeletal Evidence
When paleontologists compare a skeleton of a living bird to the
fossilized skeleton of a non-bird theropod, like Sinornithosaurus,
they see many similarities. They both have a hole in the hipbone, a
feature that distinguishes most dinosaurs from all other animals.
This feature allows an animal to stand erect, with its legs directly
beneath its body. All theropod dinosaurs, including birds, have a
furcula, also known as a wishbone. Another shared characteristic is the presence of hollow bones.
Hollow bones reduce the weight carried by an animal. This feature enables the animal to run faster. It
probably also played a role in the evolution of flight.
thought to have evolved for flight. The discovery of more and more non-flying dinosaurs with feathers
disproved that explanation. For these dinosaurs, feathers may have served other functions, like
gliding, insulation, protection, and display. Feathers play that same role in many bird species today.
Based on the evidence of shared characteristics, scientists have concluded that birds are a type of
Birds are the only dinosaurs with the ability to fly. This is
very interesting to scientists who want to know when the
capability of flight emerged. To find out, some scientists
study the brains of bird and non-bird dinosaurs. Soft
tissue, such as brains, is almost never preserved in the
fossil record. What is preserved is the imprint the brain
left on the inside of the skull. Now scientists are using
computed tomography (CT) scanners to create
endocasts. These are detailed, three-dimensional
reconstructions of the interiors of fossilized skulls.
In a recent study, researchers were able to peer inside
the braincases of more than two dozen specimens.
"Technology allows us to look inside these specimens
without destroying them," says Dr. Amy Balanoff, a
Museum research associate. "It's a non-destructive way
to basically slice up a dinosaur brain. We look inside and see what it can tell us about the evolution of
the brain within dinosaurs. Most of us grew up thinking that dinosaurs had tiny brains, but actually
some had really big brains."
The endocasts allow Balanoff and other researchers to
explore the outer shape of the brain in more detail. In
addition, the casts also provide new information about
the volume and shape of different regions of the brain.
For example, scientists looked at a detailed view of the
dinosaur cerebrum, a region of the brain related to
cognition and coordination. They found that this region
was very large in non-bird dinosaurs closely related to
birds. Dr. Balanoff's research suggests that these
dinosaurs developed big brains long before flight and that
these bigger brains prepared the way for them to fly.
When examining skeletal, behavioral, and brain
evidence, scientists see that birds and non-bird dinosaurs
share many features. This helped them conclude that
dinosaurs aren't extinct after all. They're living among us today.
(Im a really fast Typer and Thinker)
Have a nice day
mercury fulminate is so unstable it is used in blasting caps. Can you offer an explanation for this instability
Answer:
Mercury fulminate is very sensitive to shock, friction, and sparks. ... put mercury fulminate into blasting caps for detonating dynamite.
Explanation:
Which ion with a
+2
charge has the electron configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6?
Answer:
atomic # 38 or strontium (Sr)
Explanation:
Which ion with a
+2charge has the electron configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6?
ADD THE ELECTRONS AND ADD 2 MORE FOR THE +2 CHARGE
so
2 +2 +6 +2 +6 +2 + 10 + 6 +2
so if it is now neutral (you added 2 e's to ofsetr the +2 charge) it has 38
protons, so it is atomic # 38 or strontium (Sr)
balanced equation for the reaction between gallium and nitric acid. any spammers will be reported only correct answers
Answer:
Ga + 6HNO3 → Ga(NO3)3 + 3NO2 + 3H2O
Explanation:
Gallium has an ionic charge of 3+, so three nitrate ions are needed to balance it out.
How many total bonds (Total shared pairs) are in the lewis structure for HSiN and CO2?
Answer:
2
Explanation:
Hope it can help you lovelots
#LEARN WITH BRAINLY
11)
is the large-scale farming that mass-produces crops and livestock.
a) Organic farming
b) Industrial farming
c) Chemical farming
Answer:
b) Industrial farming
Explanation:
The term “industrial agriculture” refers to the type of farming which raises and cultivates large numbers of livestock and plants in high-density environments. It uses modern technology to promote faster growth and reduce illness and death rates in livestock, creating food products on a mass scale.
Answer: B.
Explanation
industrial agriculture
brainliest me
A gas has a volume of 1140 ml at 37 ºC and 620 mm Hg pressure. Calculate its volume at STP.
1.900
2.800
3.819
4.1000
Answer:
3. 0.819L (819 mL)
Explanation: Before we go about solving this, we need to do some conversions prior to using the gas law, the gas law is as follows...
P(atm)*V(L)=n(mol)*r(constant)*T(in kelvin)
So here are all the conversions you need.
620 mm Hg -> 0.816 atm
1140 mL -> 1.14 L
37 C -> 310.15 K
After plugging in our new converted values, we will proceed to solve the number of moles of the gas present, our n value, so our equation will look like this...(Note: Constant r in this case is 0.08206 L*atm/K*mol)
(0.816 atm)(1.14 L) = n(0.08206)(310.15)
Solving for n we get 0.03653 moles.
Now our second part is to figure out the volume AT STP (standard temperature/pressure). In the STP conditions, your temperature defaults to 0 C (273.15 K) and 1 atm. Now there is an easier way to do this, but I'll also show the more comprehensive way. Here is the easier method...
Since 1 mole of every gas occupies 22.4 L at STP, we can simply multiply this by our number of moles. So (22.4L)(0.3653 mol) to give us 0.818272.
However, a more accurate answer can be given like this...
Plugging n back into the same equation and this time resetting pressure to 1 atm and temperature to 273.15 K and conserving our number of moles we get...
(1 atm)(v) = (0.03653 mol)(0.08206)(273.15 K)
v = (0.03653)(0.08206)(273.15)
v = 0.8188 L = 0.819 L or 819 mL
Helpppppppkklepepepepepepepe
List the metals that form only one type of ion (that is, metals whose charge is invariant from one compound to another). What are the group numbers of these metals
this question is in reference to the formation and naming of ionic compounds. Specifically, they want you to give examples of three ionic compounds with a metal to nonmetal ratio of 2 to 1. That means we need to have two metal atoms to metal ions, which are typically cat ions for every one non metal atom or an ion. In order for this to occur, we need to have the metal with half the charge of the nonmetal or the non metal with double the charge of the metal. So an example might be something like sodium sulfide. Sodium has one valence electron. It can give up sulfur needs to valence electrons in order to achieve an octet. So we need to. Sodium seems to give up one electron each to total so that sulfide can achieve an octet. Another one might be potassium oxide. Similar scenario. We've got potassium giving up one valence electron oxygen requiring too. So we need to potassium to supply the to valence electrons that oxygen needs to achieve an octet and lithium. Also in Group one A and alkali metal wants to give up just one valence electron to achieve an octet well to achieve, I guess a duet to be more like helium, and so it gives up one. If we have two of them, then we can provide the to valence electrons that sulfur needs. So this is sodium sulfide, potassium oxide and lithium sulfide. Remember when we name Ionic compounds? We named the Cat Ion with the name of the element and the anti on with the name of the Element, but with the ending oven of ID, a suffix of ID because each one of the cat ions donated their valence electrons to the anti on so the an ion could achieve an octet. Then all of the's will have an octet of valence electrons. Sulfur had six sodium had one. There were two of them, so we have a total of eight.
The metals that can form only one type of ion are Li, Al, Ca, Ba, Rb, W,Na, Mg and Sr. They are called alkali metals.
Cobalt, Co is stable in both +2 and +3 oxidation state. So it can variable.
Lithium, Li only have +1 charge. So it is invariable from one compound to other.
Lead, Pb is variable as it has +2, +4 charge in which it is stable.
Pd has +2, +4 charge in which it is stable. So, It is variable.
Copper, Cu has +1, +2 charge. It is also variable. Potassium, K has only +1 charge. It is invariable. Aluminum, Al has only +3 charge. It is invariable.
Cesium, Cs is only stable in +1 charge. It is invariable. Molybdenum, Mo is stable in +4 and +6. It is variable. Calcium, Ca and Barium Ba are stable in +2 charge. It is invariable.
Rubidium, Rb is stable in +1 charge. It is invariable. Tungsten, W is stable in +6 charge. It is invariable. Iron, Fe is stable in +2, +3 charge. It is variable. Sodium, Na is stable in +1 charge. It is invariable. Mg and Sr are stable in +2 charge. It is invariable. Vanadium, V has +2, +3, +4, +5 charges. So, It is variable.
To know more about alkali metals
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methane the principal component of natural gas is used for heating the cooking the combustion process is
Answer:
CH4 + O2 = CO2 + 2H2O
Explanation:
carbon dioxide and water is given off
Is this right so far if jut correct me abs help me on how to get the first one pleade
Be sure to answer all parts. Select the anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base. mc2x mc2xd1 mc2xans mc2xd2 Then draw the product that results after elimination of HBr. draw structure ...
The anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base is shown in the image attached as well as the structure of the product formed in the reaction.
In organic chemistry, an antiperiplanar conformation is one in which the groups point up and down at a dihedral angle of 180° away from one another. In the image attached, the antiperiplanar conformation of (CH3)2CHCH2Br is shown.
Recall that an E2 reaction is a synchronous elimination reaction where to atoms leave at the same time. The product of this reaction is also shown in the image attached.
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Stems are important plant structures because they _________.
A.
are the main sites of photosynthesis for plants
B.
are the only site of water and nutrient transport
C.
allow plants to absorb water and nutrients from the soil
D.
give the plant structure and support
Answer:
D
Explanation:
Answer:
for plato users, the answer is: give the plant structure and support
What statement describes how water is involved in weathering a rock?
Answer:
Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. If temperatures drop low enough, the water will freeze. ... Changes in temperature cause rock to expand (with heat) and contract (with cold).
Answer:
the rock has been rubbed away at for hundreds or thousands of years and the water steady washed the rock away. hope this helped.
Imagine if Rutherford conducted his scattering experiment, and his prediction about the movement of alpha particles held true Which of the other models or scientific
observations would have also been confirmed?
The Bohr model would have been confirmed because it shows electrons spinning around a nucleus
The plum pudding model would have to be true as well because it shows that electrons are scattered within an atom,
The Bohr model would have been confirmed because it shows electrons occupying random positions inside the electron cloud.
The plum pudding model would have to be true as well because it shows that all positive charge is concentrated at the center of the atom
Answer:
The plum pudding model would have to be true as well because it shows that electrons are scattered within an atom.
Explanation:
I took the test and got it right :)
The plum pudding model would have to be true as well because it shows that electrons are scattered within an atom
The model of the atom proposed by Rutherford is called the nuclear model of the atom called the nuclear model of the atom. It was proposed after his famous experiment using a thin gold foil.
His previous prediction was that the alpha particles will bend or deflect around the positively charged areas of the gold atom. If this prediction came true, the plum pudding model would have to be true as well because it shows that electrons are scattered within an atom.
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How are metals, metalloids, nonmetals grouped
no I will not please put you because that's the god of the Bible
Metals are good conductors of heat and electricity, and are malleable (they can be hammered into sheets) and ductile (they can be drawn into wire).
Nonmetals are (usually) poor conductors of heat and electricity, and are not malleable or ductile; many of the elemental nonmetals are gases at room temperature, while others are liquids and others are solids.
The metalloids are intermediate in their properties. In their physical properties, they are more like the nonmetals, but under certain circumstances, several of them can be made to conduct electricity.
hope this answer helped u, if u can pls mark me as the brainliest. :)
An ideal solution consisting of 79 wt% benzene (C6H6) and 21 wt% toluene (C7H8) was heated in a closed vessel to 50 ºC. What is the mole fraction of benzene in the vapour phase when equilibrium was reached at 50 ºC? Round your answer to two significant figures.
Data: Vapour pressure of benzene at 50 ºC = 271 mmHg
Vapour pressure of toluene at 50 ºC = 91.5 mmHg
In this case, according to the Raoult's law, we can find the mole fraction of 79 wt% benzene and 21 wt% toluene at 50 °C in the vapor phase as follows:
[tex]y_iP=x_iP_i[/tex]
However, we first have to calculate the mole fractions in the solution as follows (b stands for benzene and t for toluene):
[tex]\\x_b=0.79\frac{g\ benzene}{g\ solution} *\frac{(78.11*x_b+92.14*x_t)}{1mol\ solution} *\frac{1mol\ toluene}{78.11g\ toluene} \\\\x_b=0.79\frac{g\ benzene}{g\ solution} *\frac{78.11*x_b+92.14*(1-x_b)}{1mol\ solution} *\frac{1mol\ toluene}{78.11g\ toluene}\\\\x_b=0.79*(x_b+1.18*(1-x_b))\\\\x_b=0.79x_b+0.932-0.932x_b\\\\x_b=\frac{0.932}{1+0.932-0.79} =0.816\\\\x_t=1-x_b=1-0.816=0.184[/tex]
Next, we calculate the total pressure as follows, according to the Dalton's law:
[tex]P=x_bP_b+x_tP_t=0.816*271mmHg+0.184*91.5mmHg=237.972mmHg[/tex]
Finally, the mole fractions of the vapor phase turn out:
[tex]y_b=\frac{0.816*271mmHg}{237.972mmHg}=0.929\\\\y_t=1- 0.929=0.071[/tex]
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https://brainly.com/question/12718562https://brainly.com/question/17581597How many aluminum ions are present in 65.5 mL of 0.210 M All3solution?
Answer:
Aluminium ions present's in 65.5mL of 0.210
M All 3solution is Given below-:
Answer and Explanation: 1
The first step is to determine the moles of aluminum ions. This utilizes the volume, molar concentration, and subscripts from the chemical formula of aluminum (III) fluoride as shown.
65.5 mL×1 L1000 mL×0.210 mol AlF31 L×1 mol Al3+1 mol AlF3=0.013755 mol Al3+65.5 mL×1 L1000 mL×0.210 mol AlF31 L×1 mol Al3+1 mol AlF3=0.013755 mol Al3+
To calculate for the number of aluminum ions, we use Avogadro's number as shown.
0.013755 mol Al3+×6.022×1023 ions1 mol Al3+=8.28×1021 ions Al3+.
Itz the ans. of collage ok man.
Answer:
m0.013755
m
o
l
A
l
3
+
×
6.022
×
10
23
i
o
n
s
1
m
o
l
A
l
3
+
=
8.28
×
10
21
i
o
n
s
A
l
3
+
L
×
1
L
1000
m
L
×
0.210
m
o
l
A
l
F
3
1
L
×
1
m
o
l
A
l
3
+
1
Explanation:
The first step is to determine the moles of aluminum ions. This utilizes the volume, molar concentration, and subscripts from the chemical formula of aluminum (III) fluoride as shown.
65.5. To calculate for the number of aluminum ions, we use Avogadro's number as shown.
the farm is a place where lot's of different__________and________live.goats have________that arch backward.the horns keep them___________.
horns insects animals protected
dog's are man's best friend.dogs eat ______to keep them energetic.dogs permanent__________are ________.a dogs teeth serve as _______and as tools for ________or________food
meat cutting powerful teeth weapon tearing
Answer:
plantsanimalshornsto protect it selfkaleliving with peoplescaring itspecialbite eatExplanation:
I know it's right, because this answer is from my self and I hope it's help to us. keep learning and God bless.
draw clear, colorful and understandable diagrams of the metabolism of carbohydrates and lipids?
(you can have 2 separate ones, or you can combine them into one)
Answer:
Refer to the attachments!!
Explanation:
Calculate the molarity of a solution prepared by diluting 165 mL of
0.700 M calcium chloride to 900.0 mL.
Answer:
The product of transcription is RNA, which can be encountered in the form mRNA, tRNA or rRNA while the product of translation is a polypeptide amino acid chain, which forms a protein.
Explanation:
How many Moles of glucose are produced from 12 moles of CO2 in photosynthesis?
Answer:
2 MOLES OF GLUCOSE
Explanation:
How many Moles of glucose are produced from 12 moles of CO2 in photosynthesis?
6CO2 +6H20-------------->C6H12O6 -+ 6O20
(IN THE PRESENCE OF CHLOROPHYLL AND UV FROM )
)
6 MOLES OF CO2 MAKE 1 MOLE OF GLUCOSE
12 MOLES THEN MAKE 2 MOLES OF GLUCOSE
In the photosynthesis process, plants can use 12 moles of carbon dioxide to form 2 moles of glucose.
What is photosynthesis?It is the process by which green plants and some other organisms convert light energy into chemical energy.
Let's consider the balanced equation for the synthesis of glucose through photosynthesis.
6 CO₂ + 6 H₂O ⇒ C₆H₁₂O₆ + 6 O₂
The molar ratio of CO₂ to C₆H₁₂O₆ is 6:1. The moles of glucose formed from 12 moles of carbon dioxide are:
12 mol CO₂ (1 mol C₆H₁₂O₆/6 mol CO₂) = 2 mol C₆H₁₂O₆
In the photosynthesis process, plants can use 12 moles of carbon dioxide to form 2 moles of glucose.
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a
A molecule that experiences London dispersion forces is
likely to have a • boiling point than a molecule
experiencing a dipole-dipole interaction.
pls
Answer:
it should be the second one since London dispersion causes interaction between molecules.
hope I helped.
Generally non ionic species with no polarity forms the London -dispersion bonds. London dispersion is weaker than the dipole-dipole interaction and hence it have less boiling point.
What is boiling point?Boiling point of a substance is the temperature at which the substance changes from liquid state to gaseous state or vapor where, the two states are in equilibrium.
Boiling of a substance depends on the molecular weight, bond type,temperature, pressure as well as purity of the substance.
London dispersion force is formed between two non-polar atoms. These atoms when come closer they attains a temporary polar nature and gets bonded.
Dipole-dipole bond is formed between two atoms of permanent dipole moment and they are polar compounds. Thus dipole-dipole interaction is stronger than London dispersion interaction. A strong bond needs more energy to boil.
Hence, molecules with Dipole-Dipole bond is having higher boiling point.
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1. Write a balanced chemical equation, including physical state symbols, for the combustion of methane in gaseous gaseous carbon dioxide.
Answer:
CH4(g)+2O2(g)→CO2(g)+2H2O(g)
Explanation:
For a complete combustion reaction of a hydrocarbon, oxygen is always one of the reactants, and the products are always carbon dioxide and water.
OIIIIIIIIIIIIIIII BAAAAKKKKAA
Answer:
what is meaning of this.
Answer:
On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States.
SIGNIFICANT FIGURES ARE FIGURES WITH
Answer:
All zeros between other significant digits are significant. The number of significant figures is determined by starting with the leftmost non-zero digit. The leftmost non-zero digit is sometimes called the most significant digit or the most significant figure. For example, in the number 0.004205, the '4' is the most significant figure.
Explanation:
PA BRAINLIEST
HOPE ITS HELP
GOD BLESS