Answer:86.84
Explanation:
How do you make the shadows of objects appear bigger on the screen
Explanation:
Indoors, you can change the size of a shadow by moving your body or the object closer to or farther from the light.
Shadows grow bigger and fuzzier as the object moves closer to the light source, and smaller and sharper as the object moves farther away.
HELP ASAP 30 POINTS
IS THIS CORRECT?
answer: yes I believe so
explain: I just think it is I have done this before
A 25.0 mL sample of 0.150M hydrocyanic acid is titrated with a 0.150M NaOH solution. What is the pH before any base is added? The Ka of hydrocyanic acid is 4.9 X 10^-10.
The pH before any base is added to the hydrocyanic acid solution is approximately 0.82.
Before any base is added, the pH of the hydrocyanic acid solution can be calculated using the Ka value and the initial concentration of the acid. The pH of a solution is determined by the concentration of H+ ions present. Hydrocyanic acid (HCN) is a weak acid that partially dissociates in water. The dissociation can be represented as follows: HCN ⇌ H+ + CN-. The Ka value of hydrocyanic acid (HCN) is given as 4.9 x 10^-10.
To find the pH before any base is added, we can assume that the dissociation of HCN is negligible compared to its initial concentration. Therefore, the concentration of H+ ions can be considered equal to the initial concentration of HCN. Using the given concentration of hydrocyanic acid (0.150M), we can calculate the pH by taking the negative logarithm (pH = -log[H+]). The concentration of H+ ions is 0.150M, and thus the pH is determined as the negative logarithm of 0.150, which is approximately 0.82.
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1. Assume that the top of your head has a surface area of 25cm x 25 cm. How many newtons of force push on your head at sea level? 2. If you estimate this area to be 100 in^2 what is the force in pounds
1. Approximately 6333.125 newtons of force push on your head at sea level. Given that the surface area of the top of your head is 25 cm x 25 cm = 625 cm², we can convert it to square meters:
To calculate the force pushing on your head at sea level, we need to use the formula for pressure:
Pressure = Force / Area
Area = 625 cm² × (1 m / 100 cm)^2 = 0.0625 m²
At sea level, the standard atmospheric pressure is approximately 101,325 Pascals (Pa) or 101.325 kilopascals (kPa). Therefore, the force pushing on your head can be calculated by multiplying the pressure by the area:
Force = Pressure × Area
Force = 101,325 Pa × 0.0625 m² = 6333.125 N (to three decimal places)
2.If the area of your head is estimated to be 100 square inches, approximately 1468.276 pounds of force push on your head at sea level.If we estimate the area to be 100 square inches, we can convert it to square meters:
Area = 100 in² × (0.0254 m / 1 in)^2 = 0.064516 m²
Using the same atmospheric pressure, the force pushing on your head can be calculated:
Force = Pressure × Area
Force = 101,325 Pa × 0.064516 m² = 6530.645 N (to three decimal places)
To convert this force into pounds, we can use the conversion factor of 1 N = 0.2248 lb:
Force in pounds = 6530.645 N × 0.2248 lb/N = 1468.276 lb (to three decimal places)
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what is the volume of 9.783 x 1023 atoms of he at 9.25 atm and 512k?
The volume of 9.783 x 10^23 atoms of helium at 9.25 atm and 512 K is approximately 1.97 liters.
To calculate the volume of gas, we can use the ideal gas law equation:
PV = nRT
Where:
P is the pressure (in atmospheres)
V is the volume (in liters)
n is the number of moles
R is the ideal gas constant (0.0821 L·atm/(mol·K))
T is the temperature (in Kelvin)
Given:
Number of atoms of helium (n) = 9.783 x 10^23 atoms
Pressure (P) = 9.25 atm
Temperature (T) = 512 K
First, we need to convert the number of helium atoms to moles. Since 1 mole contains Avogadro's number (6.022 x 10^23) of particles:
Number of moles (n) = Number of atoms / Avogadro's number
Number of moles (n) = 9.783 x 10^23 atoms / 6.022 x 10^23
Number of moles (n) ≈ 1.625 moles
Now, we can rearrange the ideal gas law equation to solve for the volume (V):
V = (nRT) / P
V = (1.625 moles * 0.0821 L·atm/(mol·K) * 512 K) / 9.25 atm
V ≈ 1.97 liters
Therefore, the volume of 9.783 x 10^23 atoms of helium at 9.25 atm and 512 K is approximately 1.97 liters.
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. What is the total voltage of the circuit, if you install two D-cell batteries in a flashlight so that their positive ends are facing each other compared to If you installed the batteries with the positive and negative terminal facing each other
Answer:
0
Explanation:
A voltage makes the electric charges to move.
When we install a D - cell batteries in the flashlight with their positive ends facing each other, as compared to the batteries installed with their positive and negative terminals facing each other, the flashlight will not work as the total voltage across the two batteries will be zero.
A student dilutes 50.0 mL of a 0.10 mol/L to 0.010 mol/L. Which statement is true?
Identify the parts of a wave using the illustration and the function below.
Answer: 1. Crest 2. Trough 3. Wave Length 4. Amplitude
Explanation:
2.0 L of a gas is at STP. What is the new pressure in kPa if the volume changes to 10.5 L and the temperature and # of molecules remain constant?
Answer:
What is the new volume if the temperature is constant? V=2.50L. P = lookPa. P2=40k Pa. V2 = x. PV = P2 ... If a sample of gas occupies 6.8 L at 327°C
the standard heat of formation for NO2 is 33.2. kj/mol. how much energy is required to form 140.0g of NO2 from its respective elements in kj
Approximately 100.916 kJ of energy is required to form 140.0 g of NO2 from its respective elements.
The energy required to form 140.0 g of NO2 from its respective elements can be calculated using the standard heat of formation and stoichiometry. First, we need to determine the number of moles of NO2 in 140.0 g. The molar mass of NO2 is 46.01 g/mol, so the number of moles is calculated as:
moles of NO2 = mass of NO2 / molar mass of NO2 = 140.0 g / 46.01 g/mol ≈ 3.043 mol
Next, we multiply the number of moles by the standard heat of formation, which is given as 33.2 kJ/mol:
energy required = moles of NO2 × standard heat of formation
= 3.043 mol × 33.2 kJ/mol
≈ 100.916 kJ
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Which of the following would produce the most fluid lipid bilayer?
Choose one:
A. phospholipids with fully saturated tails of 20 carbon atoms
B. phospholipids with fully saturated tails of 18 carbon atoms
C. large amounts of cholesterol
D. phospholipids with tails of 18 carbon atoms and two double bonds
E. phospholipids with tails of 20 carbon atoms and two double bonds
Phospholipids with tails of 18 carbon atoms and two double bonds would produce the most fluid lipid bilayer
Option (D) is correct.
The fluidity of a lipid bilayer is influenced by the composition of the phospholipids that make up the membrane. The presence of unsaturated fatty acid tails, indicated by the presence of double bonds, increases the fluidity of the lipid bilayer.
phospholipids with tails of 18 carbon atoms and two double bonds, would produce the most fluid lipid bilayer among the given choices. The presence of double bonds in the fatty acid tails introduces kinks in the hydrocarbon chains, which prevent them from packing tightly together. This increases the fluidity of the lipid bilayer by allowing the phospholipids to move more easily.
Therefore, the correct option is (D).
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Please help me ASAP I’m almost done.
Answer:
i think the answer is c
Explanation:
sorry if im wrong i am most likely wrong but ye
Kathy is trying to conduct an experiment she wants an element that is
very reactive, which of these should she use?
Normal values for chemistry tests on serous fluid are different from values obtained on serum.
a. True
b. False
a. True. Due to the differences in composition between serous fluid and serum, the normal values for chemistry tests can vary.
Serum refers to the liquid component of blood that remains after the blood has clotted and the clot has been removed.
On the other hand, serous fluid is a clear, watery fluid that is similar to serum and is found in body cavities such as the pleural, peritoneal, and pericardial cavities.
The composition of serous fluid can differ from serum due to various factors. When testing serous fluid, the values for chemistry tests such as electrolytes, proteins, enzymes, and other analytes may have different reference ranges compared to those obtained from serum testing. This is because the cellular and protein content of serous fluid is different from that of blood serum.
For example, the normal range for protein concentration in serum is generally higher compared to serous fluid due to the presence of fibrinogen and other proteins involved in clotting that are not present in serous fluid.
Due to the differences in composition between serous fluid and serum, the normal values for chemistry tests can vary. Therefore, it is important to use appropriate reference ranges specific to serous fluid when interpreting the results of chemistry tests on serous fluid samples.
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Pressure is inversely proportional to which of the following, assuming all other variables are constant? Select the correct answer below O force area O both force and area O neither force or area
According to the statement, Pressure is inversely proportional to the area. Therefore, the correct answer is "Area."
According to the Physics, the pressure exerted by an object is defined as the force applied per unit area of the surface on which the force is applied. Mathematically, it can be written as,P = F / A. Where P is the pressure, F is the force and A is the area on which the force is applied.
From this equation, we can understand that the pressure exerted is inversely proportional to the area on which the force is applied. Therefore, if the area on which the force is applied is increased, then the pressure exerted by the object is decreased and vice versa. In addition, there are several factors that affect the pressure exerted by an object, including the magnitude of force applied, the area of contact, and the angle of application of the force. If all other variables are constant, then the pressure is solely dependent on the force and area of contact. Thus, pressure is inversely proportional to the area.
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T/F. In an aqueous and diethyl ether extraction the aqueous will be the top layer?
The statement is True. In an aqueous and diethyl ether extraction, the aqueous layer will be the top layer. This is due to the difference in density between water and diethyl ether.
Water has a higher density compared to diethyl ether, which causes it to settle at the bottom layer. Diethyl ether, being less dense, will form the top layer. During the extraction process, immiscible solvents like water and diethyl ether are used. Since these solvents do not mix together, they form separate layers based on their densities. Water, being denser, will settle at the bottom while diethyl ether, being lighter, will float on top. This allows for the separation of compounds or substances that are preferentially soluble in either of the solvents. By carefully extracting the top or bottom layer, depending on the desired component, one can isolate specific compounds from a mixture.
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Classify the two amino acids below according to their effective polarity in proteins at pH=7.4. n= Nonpolar up = Uncharged polar cp= Charged polar 1. 2. Classify the two amino acids below according to their effective polarity in proteins at pH=7.4. n= Nonpolar up = Uncharged polar cp= Charged polar 1. 2. Cysteine (Cys or C ) Polarity
At pH = 7.4, Cysteine (Cys or C) can be classified as up = Uncharged polar. Cysteine is a polar amino acid with a sulfhydryl group.
Cysteine is a non-polar amino acid that is made up of an aliphatic side chain containing a sulfhydryl group (–SH). This polar cysteine side chain's polarity enables the formation of disulfide bridges with other cysteine side chains in other proteins and amino acids. The polar amino acid cysteine can form a disulfide bond with another cysteine in an amino acid chain, which gives a high degree of stability to the protein molecules. This amino acid contributes to the stabilization of protein molecules by forming hydrogen bonds and disulfide bonds. The electronegative sulfur atom is responsible for its polar nature. Cysteine can be classified as an uncharged polar amino acid at pH = 7.4. Nonpolar amino acids are hydrophobic (water-repelling) and do not interact well with water. Conversely, charged amino acids are hydrophilic (water-attracting) and interact well with water.
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why do you think we have chosen reagents that generate bromine in situ instead of using liquid bromine br2 as a reagent?
The main reason for choosing reagents that generate bromine in situ instead of using liquid bromine Br₂ as a reagent is safety and ease of handling.
Using reagents that generate bromine in situ offers several advantages over using liquid bromine Br₂ directly. First, bromine is a highly reactive and corrosive liquid, posing safety risks during handling. It can cause severe burns and has toxic fumes, requiring careful precautions and specialized equipment. By generating bromine in situ, we can minimize the direct exposure and risks associated with handling liquid bromine.
Reagents that generate bromine in situ are often more stable, easier to store, and have a longer shelf life compared to liquid bromine. They can be prepared and used as needed, eliminating the need for storing and handling potentially hazardous quantities of liquid bromine. Overall, the use of in situ generated bromine reagents provides a safer and more convenient approach for conducting chemical reactions that require bromine.
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HCl (aq) + NaOH (aq) = NaCl (aq) + H2O (l)
What type of reaction is the above?
Answer:
Neutralization reaction
Explanation:
It is a reaction between an acid and a base
how to find rate of reaction experimentally of the reaction ? plz help
evidence concerning crystallized and fluid intelligence shows that
Evidence concerning crystallized and fluid intelligence shows the diverse nature of intellectual development.
Research on both crystallized and fluid intelligence suggests that there are different stages of intellectual development. Crystallized intelligence reflects the sum of knowledge, abilities, and experience obtained through education and life events. It includes vocabulary, factual knowledge, and problem-solving abilities that rely on previously learned information.
In contrast, the ability to reason logically, solve unexpected issues, and adapt to changing circumstances is referred to as fluid intelligence. It calls on abilities like pattern recognition, spatial imagery, and abstract reasoning. Studies have revealed that individuals can have varying levels of crystallized and fluid intelligence, and these skills can vary across different periods of life due to factors like education, environmental effects, and cognitive aging.
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How many molecules are in 3.01 g of H2O
A. 0.167 molecules
B. 54.18 molecules
C. 1.01x10^23 molecules
D. 6.022x10^23
Answer:
Option C
Explanation:
No. of Molecules=(Given Weight/Molar weight)*Avagadro No.
Given weight of H2O=3.01g
Molar weight of H2O=18g
On applying the formula, we get:
No. of Molecules=(3.01/18)*6.023*10²³=1.01*10²³
13. The element with the following electron configuration [Kr] 4d105s25p2 belongs to
Group of answer choices
actinide.
metal.
transition element.
nonmetal.
lanthanide.
14. Which is a physical change?
Group of answer choices
KNO3 dissolves in water
A firecracker explodes
Popcorn pops when placed in a microwave
A nail rusts
A piece of wood is burned
The element with the following electron configuration [Kr] 4d105s25p2 belongs to transition element.
The given electron configuration belongs to an element with atomic number 52. It can be written as 1s22s22p63s23p63d104s24p64d105s25p2. It belongs to the transition element as the electrons are filled in d orbital. KNO3 dissolves in water is a physical change.A physical change refers to a change in the state or properties of matter without any modification in its composition. The given options that are physical change and rest is a chemical change.KNO3 dissolves in water is a physical change as the salt is still KNO3 and has not been modified into something else. It simply separated into smaller particles to mix uniformly with the solvent, which in this case is water.A firecracker explodes, when popcorn pops when placed in a microwave and a piece of wood is burned are all examples of chemical change.A nail rusts is also a chemical change.
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Pls help if you can, Thx! Describe ozone creation and loss in the ozone layer. Does one occur more than the other?
Ozone was created millions of years ago from a natural process frozen in ice during the ice age, the gases that make up the ozone layer were formed naturally from oxygen atoms accompanied by a reaction of ultraviolet radiation and molecular oxygen which was frozen in the ice during the time of the ice age was released over years as the ice melted.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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The energy needed to overcome intermolecular forces is called?
Answer:
vaporization.
Explanation:
how do hydrogen fuel cells and fossil fuels produce energy?
Answer:
The hydrogen reacts with oxygen across an electrochemical cell
Explanation:
PLSSSSSS ANSWERRRRR???
Answer:
( j ) should be the correct option because atomic number of fluorine is 9 so, no. of electrons and protons should be same I.e. 9
Emu
Sparrow
How are emus and sparrows alike?
A. Both birds build nests in trees.
B. Both birds are taller than humans.
C. Both birds catch small animals while flying.
U
D. Both birds have a beak for breaking apart food.
Define Transportation plants:
Define Respiration Plants:
Answer:
Define Transportation in plants: Transportation in plants is when the plant transports water and other mineral throughout the whole plant from the roots to the stem and finally specific parts of a plant.
Define Respiration In Plants: Is when plants use photosynthesis to make their own food to make energy for the plant's growth
What is the oxidation state of copper in Cu(C2H3O2)2? +2 -1 -2 +4 +1