Answer:
Dehydrogenation of alkanes is endothermic
Explanation:
The dehydrogenation of alkanes is an endothermic reaction. The enthalpy change for the reaction is highly positive.
Recall that for an endothermic reaction, increase in temperature increases the rate of forward reaction.
As a result of that, the dehydrogenation of alkanes proceeds in the foward direction at elevated temperatures.
f a gas has an initial volume of 10L at a temperature of 350K and it is then heated to 680K, what is the new volume?
Answer:
V1 = 10 L
V2 = x L
T1 = 350 K
T2 = 680 K
And you are looking for the second Volume
the image shows the work and the answer is going to be 19.4 L or just 19 L
Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.
What is the ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.
An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]V_1[/tex] = 10 L
[tex]V_2[/tex] =?
[tex]T_1[/tex] = 350 K
[tex]T_2[/tex]= 680 K
Now using equation:
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
[tex]\frac{10 L}{350 K} = \frac{V_2}{680 K}\\[/tex]
[tex]V_2[/tex] = 19.4 L
Hence, 19.4 L is the new volume of gas when the initial volume of 10L at a temperature of 350K and is then heated to 680K.
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1. What is a geologic fold and what causes one to form? 2. What types of forces create a set of folds? 3. What is a monocline? Where are the older rocks found? 4. What is an anticline? Where are the older rocks found? 5. What is a syncline? Where are the older rocks found?
Answer:
Fold, in geology, undulation or waves in the stratified rocks of Earth's crust. Stratified rocks were originally formed from sediments that were deposited in flat horizontal sheets, but in a number of places the strata are no longer horizontal but have been warped. FoldsEdit. When rocks experiencing compressive stress deform plastically, the rocks crumple into folds. Folds are just bends in the rock. You can easily make folds by placing your hands on opposite edges of a piece of cloth and pushing the cloth together. monocline:a bend in rock strata that are otherwise uniformly dipping or horizontal. Bedrock along the northeast coast of Hudson Bay, Canada, has the oldest rock on Earth. Canadian bedrock more than 4 billion years old may be the oldest known section of the Earth's early crust. anticline:a ridge-shaped fold of stratified rock in which the strata slope downward from the crest. syncline:a trough or fold of stratified rock in which the strata slope upward from the axis.
Explanation:
Answer:
1. Fold, in geology, undulation or waves in the stratified rocks of Earth's crust. Stratified rocks were originally formed from sediments that were deposited in flat horizontal sheets, but in a number of places the strata are no longer horizontal but have been warped.
2. FoldsEdit. When rocks experiencing compressive stress deform plastically, the rocks crumple into folds. Folds are just bends in the rock. You can easily make folds by placing your hands on opposite edges of a piece of cloth and pushing the cloth together.
3.a bend in rock strata that are otherwise uniformly dipping or horizontal.
4. a ridge-shaped fold of stratified rock in which the strata slope downward from the crest.
5.In anticlines, as seen on the ground, the oldest rocks are in the center of the fold. In synclines, the youngest rocks are in the center of the fold. This intensely folded limestone from Highland County shows how anticlines and synclines typically occur together. These sharp folds are called "chevron" folds.
g It turns out that (5) 157Gd really, really, REALLY likes capturing a neutron, emitting a gamma. Write the reaction (A a
Answer:
157 64 Gd + 1 0 n -----> 158 64 Gd + γ
Explanation:
In a nuclear reaction, both mass and charge are conserved. If we look at the equation above, we will notice that this principle was followed.
Gama rays has no mass and charge because it is an electromagnetic wave. The relative atomic mass of the isotope of Gd formed in the reaction is 158 Gd. The atomic number remains the same.
Are the cells in your body right now the same exact cells you was born with true or false
Answer:
False
Explanation:
Cells are constantly dying and being reproduced.
Answer:
False.
Explanation:
Your cells are in a constant state of dieing and being replaced by new cells. As a result, very few of the cells in your body now are the exact same cells that you had 20 years ago. Your cells are constantly dying, but they're being replaced with new, fresh cells. ... The average age of a cell is 7 years… but that doesn't mean that every cell is replaced in 7 years. Some cells, in fact, never get replaced at all, remaining with us from birth until death.
1. How do scientists know how hot the
core is?
A. Thermometers
Seismic waves
C. Oil wells
D. Measure the electromagnetic
spectrum
A.THERMOMETERS SEISMIC WAVES
4. What is an example of a chemical change that happens inside your body?
a. Food being broken down by enzymes in your stomach b. Food being broken into small pieces by your teeth
c. Food being moved from your esophagus into your stomach
d. Water being absorbed inside your large intestine
Answer: a
Explanation: enzymes are a type of chemical in your body that helps break down food, thus it’s a chemical change in your body.
Food is broken down by the enzymes in the stomach is an example of chemical change happening inside the body. So the correct option is A.
What is digestion?
The process of breakdown down food into its constituent nutrients is defined as the process of digestion. The process of digestion is of two types -
Mechanical digestion: This includes the breakdown of food by mastication performed by teeth. During this process, the food is also mixed with the saliva and a bolus is formed. Chemical digestion: This includes the breakdown of food by the use of enzymes like the saliva present in salivary amylase and the gastric enzymes and intestinal enzymes from the stomach and intestines respectively.Thus, digestion begins in the mouth and both mechanical and chemical digestion takes place in the mouth. In the small intestine, the food is broken down into the smallest constituent nutrients and absorbed into the body.
Therefore the correct option is A.
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What is the function of ROM
Answer:
Read only memory (ROM) is non-volatile primary storage. It keeps its contents when the computer is turned off. ROM can be read from but not written to. ROM can be read from but not written to, hence the term read only.
Explanation:
Which is a chemical property of trasistion elements?
A) brightly colored
B) denser than alkali metals
C) great ductility
D) reacts little with oxygen
Answer:
Maybe D? B?
Explanation:
Sorry if I made u get it wrong
The following reaction is a single replacement reaction. What happens to the oxidation number of the elements in this reaction? Show proof. Li(s) + CuCl2(s)=LiCl(s) + Cu(s)
Answer:
1. The oxidation number of Li changes from 0 to +1
2. The oxidation number of Cu changes from +2 to 0.
3. The oxidation number of Cl remains the same in each compound.
Explanation:the equation for the reaction is given below:
Li(s) + CuCl2(s) —> LiCl(s) + Cu(s)
Next, we shall determine the oxidation number of each element in the reaction.
NOTE: 1. Oxidation number of chlorine (Cl) is always –1 in any compound because it is a ground 7 element.
Now, we shall determine the change in oxidation number of each element. This is illustrated below:
1. For Li:
Li = 0 (ground state)
LiCl = 0
Cl = –1
Li + (–1) = 0
Li – 1 = 0
Collect like terms:
Li = 0 + 1
Li = +1
The oxidation number of Li changes from 0 to +1
2. For Cu:
CuCl2 = 0
Cu + 2Cl = 0
Cl = –1
Cu + 2(–1) = 0
Cu – 2 = 0
Collect like terms
Cu = 0 + 2
Cu = +2
Cu = 0 (ground state)
The oxidation number of Cu changes from +2 to 0.
3. For Cl:
The oxidation number of Cl remains the same in each compound.
Summary:
1. The oxidation number of Li changes from 0 to +1
2. The oxidation number of Cu changes from +2 to 0.
3. The oxidation number of Cl remains the same in each compound
Which of the following statements is true about Sir Isaac Newton?
A. He realized that the Moon orbits Earth.
B. He made a connection between the mass of objects and the distance between them.
C. He discovered gravity when an apple fell on his head.
D. He found that gravity was the strongest force.
Answer:
B. he made a connection between the mass of objects and the distance between themThe true statement about Sir Isaac Newton is that he made a connection between the mass of objects and the distance between them. Hence option B is correct.
What is mass?Mass is defined as a dimensionless number used to describe the mass of a particle or item. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial. A substance's mass, expressed in kilograms (kg), can be used to estimate its matter content.
Every item in the universe is attracted to one another by a force that is directly proportional to the product of the masses of the objects and inversely proportional to the distance between them, according to Newton's law of universal gravitation.
Thus, the true statement about Sir Isaac Newton is that he made a connection between the mass of objects and the distance between them. Hence option B is correct.
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When working with a gas, it is important to know its?
A. volume, shape, mass
B. temperature, pressure, volume
C. pressure and mass
D. temperature, pressure, mass
The inertia of a bowling ball is the inertia of a golf ball.
less than
equal to
greater than
The inertia of a bowling ball is greater than the inertia of a golf ball.
Further explanationIn Newton's first law, it is stated that if the resultant force acts on an object of magnitude is zero, it can be formulated:
[tex]\large{\boxed{\bold{\sum F=0}}[/tex]
then the object tends to defend itself from its state.
or can be stated:
An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.
So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia
The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.
Objects that have more mass will have more ability to maintain their state
So a larger bowling ball mass will have greater inertia than a golf ball
Answer:
greater than
Explanation:
I did this assignment
The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.
Which change of state is taking place?
gas to solid
gas to liquid
liquid to solid
solid to liquid
Answer:
liquid to solid
Explanation:
liquid atoms are closer together but can slide past one then it starts to lose energy and locks in which in that case turns intl a solid.
Hopefully that helped
The scenario described in the question suggests a change from a liquid state to a solid state, known as solidification or freezing. When a liquid is cooled, the energy of the molecules decreases and they begin to move more slowly.
What happens when the temperature approaches zero ?As the temperature approaches the freezing point, the attractive forces between the molecules begin to overcome their thermal energy, causing the molecules to arrange themselves in a more organized and compact structure. Eventually, the molecules become locked in place, forming a solid.
The degree to which a liquid can be supercooled before solidifying depends on factors such as the specific properties of the liquid, the rate of cooling, and the presence of impurities.
In some cases, supercooling can occur where a liquid is cooled below its normal freezing point without solidifying. However, even in these cases, the liquid will eventually solidify if it is disturbed or seeded with a small crystal of the solid phase.
Therefore, Solidification is an important process in many industries, such as metalworking and manufacturing of plastics and ceramics. Understanding the factors that influence solidification can help improve the quality and properties of these materials.
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How many possible stereoisomers are there of panthenol, an organic compound found in L'Oreal shampoo
Answer:
2
Explanation:
Panthenol (or provitamin B5) is an active ingredient used as a moisturizer, in particular, to treat sensitive and dry skin. It also goes into the hair care formulation to nourish dry hair. All the benefits of this precursor of vitamin B5.
It has moisturizing, anti-inflammatory, regenerating, and healing properties. Panthenol also strengthens the hydrolipidic film, improves the elasticity of the skin, and promotes cell renewal in the event of injuries: this is why it is also used in the event of injuries or sunburn.
Thus, from the image below, the structure of Panthenol is being shown and the number of possible stereoisomers is being outlined as well.
Students are given a sample of an unknown material. They want to perform tests to determine its identity. Which test is MOST likely to change the sample into another material?
a
dissolving it in water
b
heating it until it melts
c
heating it until it melts
d
burning it in a flame
Answer: a
. dissolving it in water
Explanation:
When the unknown material is dissolved in water, it could react with the water particles and end up producing another material. For instance an alkali metal in water could form metal oxides.
Heating the material until it melts will not change it into another material because it will still be the same material only now it will be in liquid form. The same logic applies if it is burnt in a flame.
Proper way water molecules form hydrogen bonds
Explanation:
Water molecules form hydrogen bonding when the oxygen of one water molecule combines with the hydrogen of another molecule.
Hydrogen bonding is an electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom of a neighboring molecule.
This bond is made possible by the electronegativity difference between oxygen and hydrogen for water molecules. The intermolecular forces is responsible for the physical and chemical properties of water.Radioisotopes are often used in diagnostic imaging for detecting disease. The isotope 131I (iodine-131), which has a half-life of 8.02 days, is used in nuclear medical imaging. What percentage of the original activity in the sample remains after 17.5 days
Answer: Approximately 22.04% of the original.
Explanation: Radioisotopes, like iodine-131, have unstable nuclei. To become stable, they eject some particle (alpha or beta) or energy (gama).
Half-life is a time for half of the substance to decay. Activity is rate of decay, i.e., the number of decays per unit time.
Half-life and Activity are related by the following:
[tex]A=A_{0}.\frac{1}{2^{n}}[/tex]
where
A is activity
[tex]A_{0}[/tex] is initial activity
n is number of half-lives passed in t
For iodine-131, half-live is 8.02, so in 17.5 it has passed:
[tex]n=\frac{17.5}{8.02}[/tex]
n = 2.182
Final activity will be:
[tex]A=\frac{A_{0}}{2^{2.182}}[/tex]
[tex]A = 0.2204A_{0}[/tex]
Which means after 17.5 days, there were 22.04% of the original iodine-101.
Determine the mass of 7.20 moles of iron??
Answer:
[tex]m_{Fe}=4.02x10^{2}gFe[/tex]
Explanation:
Hello!
In this case, since the mole-mass relationships allows us to compute the moles or mass of a sample given the mass or moles via the atomic (elements) or molar mass (compounds). For iron, whose atomic mass is 55.847 g/mol, we can compute the mass o 7.20 moles as shown below:
[tex]m_{Fe}=7.20molFe*\frac{55.847gFe}{1molFe}\\\\m_{Fe}=4.02x10^{2}gFe[/tex]
As you can see we write 1 mol Fe on bottom in order to cancel the given moles out.
Best regards!
A characteristic used to determine a type of mineral is
please help fast
Answer:
Cleavage and Fracture
Explanation:
Cleavage and Fractures are both characteristics used to determine a type of mineral, along with hardness, luster, color, streak, specific gravity, and tenacity, all of which not included in the answers.
What are tides
A. Movements of the Earths water through ocean.
B. The daily rise and fall of the Earth’s water along the shore.
C. The cycling of water through the environment.
Answer: B
Explanation:
How much limestone (in kg) is required to completely neutralize a 4.5 billion liter lake with a pH of 5.3
Answer:
1105.7kg of limestone must be added
Explanation:
A solution is neutralized when pH = 7.0. That is [H+] = 1x10⁻⁷M.
The initial [H+] is 10^-5.3 = 5.01x10⁻⁶M.
That means we need to neutralize:
5.01x10⁻⁶M - 1x10⁻⁷M = 4.91x10⁻⁶M
The moles of H+ in 4.5 billion liters = 4.5x10⁹L are:
4.91x10⁻⁶M * (4.5x10⁹L) = 22095 moles of H+
That reacts with limestone (CaCO3), as follows:
2H+ + CaCO3 → H2O + CO2 + Ca²⁺
Moles of limestone needed to neutralize the lake are:
22095 moles of H⁺ * (1 mole Limestone / 2 moles H⁺) = 11047.5 moles of limestone.
Molar mass of limestone is 100.09g/mol. Mass of limestone we need to add are:
11047.5 moles of limestone * (100.09g / mol) = 1.106x10⁶g of limestone. In kg:
1.106x10⁶g of limestone * (1kg / 1000g) =
1105.7kg of limestone must be added
6. Matter is anything that occupies______
and has_____
Answer:
Any thing that takes up space and has mass
Explanation:
Answer:
1.mass 2.space
Your welcome
When you say that
something is hard to lift, are you talking about
weight or mass?
Answer:
Weight
Explanation:
WHen talking about weight you’re referring to the force exerted to lift if, but when you’re talking about mass it’s just how much it weighs but not how much it takes to lift it.
A horse has been clocked at 90 km/hr. What is its speed in centimeters
per second? USE UNIT CANCELLATIONS AND SHOW ALL WORK.
Answer:
2502 cm/s
Explanation:
In conversions from one unit to another,we always use a conversion factor. A conversion factor is a number used to change one set of units to another, by multiplying or dividing. The conversion factor in changing km/hr to cm/s is:
1 km/hr = 27.8 cm/s.
Hence 90 km/hr = 90 * 27.8 = 2502 cm/s
How many mg are in 13 grams
[tex]\text {Hi There! Let's Solve this Problem!}[/tex]
[tex]\text {Since we are trying to find how many milligrams (mg) are in 13 grams}[/tex] [tex]\text {we Multiply 1000.}[/tex]
[tex]\text {\underline {Multiply}}[/tex]
[tex]\text {1000*13=}[/tex]
[tex]\text {Your Answer Would Be:}[/tex]
[tex]\fbox {13000}[/tex]
[tex]\text {Best of Luck!}[/tex]
A compound is found to contain 59.94% carbon 13.44% hydrogen and 26.62% oxygen by mass
Answer:
C3H8O
Explanation:
These are the steps:
1. Write the given value for each element.
2. divide them by their Ar.
3. Divide the result by the smallest value in the ratio.
C H O 59.94% 13.44% 26.62% 59.94÷12 13.44÷1 26.62÷16
4.995 13.44 1.664
(4.995÷ 1.664) (13.44÷ 1.664) (1.664÷1.664)
3.00 8.07 1
3 : 8 : 1
So the compound is C3H8O.
Strontium is in Group 2 or the periodic table. Which number of electrons must be gained or lost for strontium to form a complete valence shell?
A. 2 gained
B.2 lost
C. 6 gained
D. 6 lost
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Select the correct set of quantum numbers (n, l, ml) for the third electron removed in the formation of a cation for iron, Fe3+.
Answer:
The third electron to be removed has to be in;
n = 3
l = 2
ml = -2, -1, 0, 1, 2
Explanation:
There are four basic quantum numbers;
i) principal quantum number (n)
ii) Azimuthal, Obital or Subsidiary quantum number (l)
iii) Magnetic quantum number (ml)
iv) Spin quantum number (ms)
The electronic configuration of Fe3+ is:
1s2 2s2 2p6 3s2 3p6 3d5
The third electron to be removed has to be in;
n = 3
l = 2
ml = -2, -1, 0, 1, 2
The third electron removed in the formation of a Fe³⁺ has the quantum numbers:
n: 3l: 2ml: -2Iron has an atomic number of 26, so it has the following electron configuration:
[tex]Fe: [Ar] 4s^{2} 3d^{6}[/tex]
To form cations, it first loses the electrons from the outermost shell (4s). The electron configuration of Fe²⁺ is:
[tex]Fe^{2+} : [Ar] 4s^{0} 3d^{6}[/tex]
Then, it will lose an electron from the highest energy level (3d) to form Fe³⁺.
[tex]Fe^{3+} : [Ar] 4s^{0} 3d^{5}[/tex]
The third electron lost from Fe to form Fe³⁺ was in 3d⁶.
The principal quantum number (n) coincides with the energy level: 3.The azimuthal quantum number (l) corresponding to the sublevel d is 2.The magnetic quantum number (ml) goes from -l to +l. Once each orbital has at least 1 electron (5 electrons), the second electron goes to the orbital with ml = -2.The third electron removed in the formation of a Fe³⁺ has the quantum numbers:
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i have to turn in this for a test tomorrow!!! i really need it by tomorrow this question is 60 points :) and if you answer it i’m gonna like all of you questions you have answered! p.s click the picture to see it all of the questions are there
Answer:
2. chloroplast
3. cell wall
4. vacuole
5. mitochondrion
6. nucleus
7. lysosome
8. cytoplasm
Explanation:
Li2SO4 can u break it up pls