Answer:
Models make concepts more tangible. They also make it possible to notice patterns, develop or revise representations, and predict or explain events or relationships.
Explanation:
Trust me it's the answer okay
Why does decreasing the temperature of orange juice increase its pH level? Is it something to do with the chemical equilibrium?
Decreasing the temperature of orange juice increases its pH level because the solubility of carbon dioxide (CO2) in the juice decreases, leading to less carbonic acid formation and therefore a higher pH, meaning the juice becomes less acidic.
The pH of a solution is a measure of its acidity or basicity. In the case of orange juice, the main source of its acidity is the various organic acids present, such as citric acid. However, carbon dioxide (CO2) dissolved in the juice also contributes to its acidity through the formation of carbonic acid (H2CO3). Temperature plays a role in the solubility of gases in liquids; as temperature decreases, the solubility of gases increases. Conversely, when the temperature is increased, the solubility of gases like CO2 decreases, which means less CO2 is dissolved in the juice, leading to less carbonic acid formation, and thus a reduction in the overall acidity level. The pH level, therefore, increases with a decrease in temperature.
How many neutrons does an element have if its atomic number is 40 and its mass number is 154
The element has 114 neutrons.
The atomic number of an element is the number of protons found in the nucleus of an atom of that element. It is denoted by the symbol Z and uniquely identifies a chemical element.
To find the number of neutrons, we will subtract the atomic number from the mass number.
Atomic number (Z) = 40 (This is the number of protons)
Mass number (A) = 154 (This is the total number of protons and neutrons)
Number of neutrons = Mass number - Atomic number
Number of neutrons = 154 - 40
Number of neutrons = 114
19 pts - How do you determine if something is isoelectronic?
Which of the following is isoelectronic-
O2, F-, Ne, Na
Se2-, Br-, Kr, Rb+
I-, Xe, Cs, Ba2+
what does it mean when the h3o+ to x- distance doesn't change much as the first 4 to 5 water molecules are added
The addition of the water molecules to the hydronium and the halogen groups is modeled by dissociation. The distance does not change because halogen ion is a stronger base than water.
What are a strong base and weak acid?Strong bases are the solution that gets completely dissociated in the aqueous solution and results in the release of hydroxide ions.
Weak acids are acids that do not get dissociated completely into ions in an aqueous solution.
When water molecules are added to the solution the distance [tex]\rm H_{3}O^{+}[/tex] to [tex]\rm X^{-}[/tex] does not change as [tex]\rm X^{-}[/tex] is a strong base than the water and [tex]\rm HX[/tex] is weak acid than the hydronium ion.
Therefore, the distance does not change.
Learn more about acids and bases here:
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How are ionic bonds formed
Answer:
Ionic bonds are formed by the transfer of valence electrons (those that can move free) between certain type of atoms, these exchange generates two iconic atoms with opposite charge.
So, basically, the transfer of this electrons is how is formed.
Which of the following is not true of a scientific theory? It can be disproven or changed as new evidence is discovered. It must be supported by many scientific investigations over time. It can become a law once it is proven by several experiments. It must be verified by scientists around the world.
Answer:
It must be verified by scientists around the world.
Explanation:
A theory is a rational and plausible explanation of a certain phenomenon that occurs in the universe and that can be explained scientifically.
The theory is formulated after certain experiments have been done, however, it is not considered an absolute truth, as it can be motivated through the years by other experiments and with the advancement of technology. In that case, a theory can be refuted and reframed as new evidence is discovered. In addition, in order for it to remain relevant, it must be supported by many scientific investigations over time, until the moment comes when the experiments comprised 100% of this theory, allowing it to start being called "Scientific Law". However, it is not necessary for all scientists in the world to test the theory in their experiments.
Trejo reacts 5.0 moles of hydrochloric acid (HCI) with 1.5 moles of barium hydroxide (Ba(OH)2). Which reagent is the limiting reagent and which is in excess?
How many calories are required to raise the temperature of 105 g of water from 30.0°C to 70.0°C?
What is the different types of technology used for cloning animals?
Final answer:
Reproductive cloning involves creating an identical copy of a multicellular organism, overcoming the mix of DNA in sexual reproduction. Techniques like Somatic Cell Nuclear Transfer (SCNT), used to clone Dolly the sheep, along with gene cloning and PCR, are crucial in this biotechnological process.
Explanation:
Various Types of Technology Used for Cloning Animals
The process of creating an identical copy or a clone of an entire multicellular organism is known as reproductive cloning. This biotechnological method has enabled scientists to overcome the barrier of sexual reproduction, which mixes the DNA of two parents making the creation of an identical organism through natural means impossible. One of the most famous examples of reproductive cloning is Dolly the sheep, cloned in 1996 from an adult somatic cell.
Techniques Used in Animal Cloning
Somatic Cell Nuclear Transfer (SCNT) - This involves removing the nucleus from a donor egg cell and replacing it with the nucleus from a mature somatic cell of the organism to be cloned. The embryo is then implanted into a surrogate mother. This was the technique used to create Dolly.
Gene cloning - Though more commonly applied at the molecular level to clone genes, this technique can also lay the groundwork for further cloning processes by allowing the replication of specific desirable traits.
Polymerase Chain Reaction (PCR) - While not a cloning technique per se, PCR is a crucial method in genetic engineering and biotechnology for amplifying DNA segments, which is a foundational step in many cloning procedures.
Reproductive cloning and its techniques, like Somatic Cell Nuclear Transfer (SCNT), have opened new possibilities in the field of genetics, agriculture, and medicine by allowing the cloning of animals. These advancements put into practice the theory of artificially inducing asexual reproduction in mammals, as seen in the successful cloning of Dolly the sheep and several other animals since then.
Coal is used in the making of _____. Select all that apply.
Plastics
Medicine
Clothing
Paper
Food
Answer:
Plastics, Medicine, Clothing, Paper
Explanation:
everything but food
Definition: One of a class of elements having properties intermediate to metals and nonmetals.
Answer:
Metalloids
Explanation:
Metalloids are compounds whose properties are intermediate between those of metals and non metals. That is, they do not behave as pure metals, neither do they behave as pure nonmetals. For instance, the electrical conductivity of metals decreases with temperature while nonmetals do not conduct electricity at all under any condition. However, metalloids conductivity increases with increase in temperature because they conduct electricity in a manner slightly different from the manner in which metals conduct electricity.
What unit is used when measuring the push that causes a change to move ?
- Ohm
- Volts
- Resistance
- Pressure
Warwick Police discovered the body of a 36-year-old white male (later identified as Darren Davis) in a field about 20 miles north of town. Mr. Davis’s body was discovered at 7:30 p.m. on Friday, October 11. He was found lying face up on a yellow king-size sheet. According to autopsy reports, one fatal gunshot to the back of the head ended Mr. Davis’s life. Scientists estimate that his death occurred at about 4:20 p.m. As investigators scanned the crime scene, they made the following notes:
Paper plates filled with partially eaten fried chicken, deviled eggs, potato salad, and chocolate cake were located near Mr. Davis’s body.
An open bottle of red wine and two partially filled glasses of wine were found next to the yellow sheet.
A recently-smoked cigarette butt was found near the sheet.
Shoeprints from the road to the field were those of a male, size 10, and a female, size 5. The only shoeprints from the field back to the road were those of a female, size 5.
Car tracks of the same wheel base and tread pattern as Mr. Davis’s automobile were found at the road. The car was not found at the scene.
Mr. Davis’s car was found abandoned in an empty parking lot in downtown Warwick.
Investigators believe that a female friend of Mr. Davis was responsible for his demise. After questioning family and friends, it was discovered that the deceased had frequent social outings with 6 women who live in or near Warwick. The women’s names are Sue, Laura, Gwen, Beth, Eliza, and Patty. Investigators gathered the following information about the 6 women:
Beth works full-time as a caterer.
Eliza and Gwen are schoolteachers.
Sue’s babysitter says Sue arrived home in her own car at about 5 p.m.
Patty and Eliza live together in a two-bedroom apartment in downtown Warwick.
Gwen lives in a nearby town called Jordan.
Eliza and Beth are very petite women—they wear size 4 blue jeans.
Gwen and Patty are smokers.
Sue’s father owns a gun shop.
Eliza attends a 5 p.m. step aerobics class in downtown Warwick every Friday afternoon and has not missed a class in two years.
Patty is deathly allergic to grapes.
Laura works at a chemical supply house.
Sue lives in a country house about 30 miles west of Warwick.
Gwen is a vegan (does not eat any animal products).
Sue is a florist.
Beth doesn’t know how to drive.
Eliza and Gwen hate the color yellow.
Laura played center for a semiprofessional basketball team 5 years ago. She has red hair and is 6 feet, 1 inch tall.
Based on the preceding information, determine who murdered Mr. Davis and give the general facts of the case.
"I think Sue was the one who killed Mr. Davis"
Omega lullllllllllllll
Which formula represents a molecule of 2 - chlorobutane?
What is the most strongest metal on earth?
Answer: tungsten
Explanation:
In terms of tensile strength, tungsten is the strongest out of any natural metal (142,000 psi). But in terms of impact strength, tungsten is weak — it's a brittle metal that's known to shatter on impact. Titanium, on the other hand, has a tensile strength of 63,000 psi.
heated blocks of iron used to be warm bed. A 1600g brick of iron heated to 155c would release how many joules of heat energy as it cooled to 25c?
Final answer:
The 1600 g iron brick would release 93,568 joules of heat energy as it cools from 155°C to 25°C.
Explanation:
The heat energy released by a 1600 g brick of iron as it cools from 155°C to 25°C can be calculated using the specific heat capacity of iron and the formula Q = mcΔT, where Q is the heat energy in joules, m is the mass in grams, c is the specific heat capacity in J/g°C (for iron, c = 0.449 J/g°C), and ΔT is the change in temperature.
To find out how much heat energy is released, we calculate:
Mass (m) = 1600 g
Change in temperature (ΔT) = 155°C - 25°C = 130°C
Specific heat capacity (c) = 0.449 J/g°C
Substitute these values into the formula:
Q = 1600 g × 0.449 J/g°C × 130°C
Q = 93568 J
Therefore, the 1600 g brick of iron would release 93,568 joules of heat energy as it cools to 25°C.
What factor impacts the possible number of ways in which different atoms can be put together
Answer:
the ability of atoms to combine
Explanation:
Which organs are part of the musculoskeletal system? Check all that apply.
bones
hair
muscles
skin
tendons
nails
Answer:Bones,muscles, tendons are part of the musculoskeletal system
Explanation:
Musculoskeletal provides support, form, stability and movement to the body.It is made up of skeletal bones, muscles, cartilages, tendons, ligaments and other connective tissues that supports and binds the organs together.
So from the given list of organs the part of the musculoskeletal system are:
Bones,Muscles, tendons
Where do you see physical and chemical weathering on a daily basis?
If you look carefully at the world, you will notice that there are many examples of physical and chemical weathering all around us.
Physical weathering occurs when rocks are broken apart without them changing their chemical composition. An example would be how, during the winter, ice can grow in cracks of rocks, weakening and eventually breaking them apart.
On the other hand, chemical weathering refers to rain water reacting with the mineral grains in rocks in order to form new minerals. An example of this would be how metal objects sometimes rust if they are left in the rain constantly.
How do you find the advantage of wheels and axles?
Rita divides Avogadro’s number (approximately 6.02214 mc002-1.jpg 1023) by 2.055 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?
Answer:
2.930 x 10^23 is the correct answer
which aqueous solution of Kl freezes at the lowest temperature?
a) 2 mol of Kl in 1,000. g of water
b) 1 mol of Kl in 1,000. g of water
c) 2 mol of Kl in 500. g of water
d) 1 mol of Kl in 500. g of water
Answer:
c) 2 mol of Kl in 500. g of water
Explanation:
Colligative properties such as melting and boiling points and osmotic pressure all depend on the amount of solute present. The more the concentration of solute present, the greater the degree of display of colligative properties by a solution
Considering the options given, 2 mol of Kl in 500. g of water has the highest concentration and is expected to freeze at the lowest temperature.
the smallest particle of a substance that still retains the properties of that substance
Answer:
It is molecule
Explanation:
Just had it on study island :)
1. How do you find the mechanical advantage of a compound machine?
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Write a definition for each of these terms on the lines below
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2. pulley
3. wheel and axle
what is 350 kelvins on the celsius scale of temperature
Bill and Tom are both towing wagons. Bill's wagon weighs 10 pounds, and Tom's wagon weighs 20 pounds. Bill is pulling his wagon with twice the force that Tom is. How do the wagon speeds compare? A) Both wagons will be moving at the same speed. B) Bill's wagon is moving 4 times faster than Tom's. C) Tom's wagon is moving 4 times faster than Bill's. D) Bill's wagon is moving 2 times faster than Tom's.
Answer:
B) Bill's wagon is moving 4 times faster than Tom's.Explanation:
The motion of the wagons is determined by the net force that acts upon them, according to Newton's second law of motion:
Force = mass × acceleration ⇒ acceleration = Force / massFrom your data, you can fill this table to compare the accelerations:
Bill's wagon Tom's wagon
mass (lb) 10 20
force 2F F
acceleration 2F/10 F/20
Find the ratio between both accelarations:
Bill's wagon acceleration / Tom's wagon acceleration(2F/10) / (F/20) = (2 × 20 / 10 ) = 4Meaning that the acceleration of Bill's wagon is 4 times the acceleration of Tom's wagon.
Assuming, that both wagons start from rest, you can obtain the speeds from the kinematic equation for uniformly accelerated motion:
Speed = acceleration × time, V = a × t.Call the acceleration of Tom's wagon X, then the acceleration of Bill's wagon will be 4X.
So, depending on the time, using V = a × t, the speeds will vary:
t (s) 1 2 3 4
Speed Tom's wagon X 2X 3X 4X
Speed Bill's wagon 4X 8X 12X 16X
Concluding that Bill's wagon is moving 4 times faster than Tom's (option B).
Answer:
B
Explanation:
USATESTPREP
An empty plastic bottle is sealed in a cool room and then moved to a very hot room. What can best be stated about the air pressure inside the bottle when the bottle reaches room temperature? It is lower than the pressure on the outside of the bottle. It is higher than the pressure on the outside of the bottle. It is the same as the pressure on the outside of the bottle. It exerts twice the force per unit area as the air pressure outside the bottle.
Answer:
It is higher than the pressure on the outside of the bottle.
Explanation:
After the sealed bottle is moved from a cool room to a very hot room, the temperature of the inside gas increase. Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant. Therefore, the pressure in the bottle increase.
when water is in the gas state it is known as ________
hydrochloric acid reactys with zinc meetal. whichwould increase the reactin rate the most?
"The correct option is increasing the surface area of the zinc metal.
Increasing the surface area of the zinc metal provides more area for the hydrochloric acid molecules to collide with, thus increasing the number of effective collisions per unit time. This can be achieved by using zinc powder or by cutting the zinc metal into smaller pieces, which exposes more zinc atoms to the acid. According to the collision theory, this increase in surface area leads to an increased reaction rate because more reactant molecules can be involved in the reaction at any given time. Increasing the concentration of hydrochloric acid would also increase the reaction rate, as it would increase the number of hydrochloric acid molecules available to collide with the zinc surface.
However, this would not have as dramatic an effect as increasing the surface area of the solid zinc metal.
which of the following biomes likely has the thinnest layer of topsoil
A. tropical rainforest
B. deciduous forest
C.grassland
D. desert