How many water molecules are in a block of ice containing 1.75 mol of water (H2O)?
Vinegar is a solution of acetic acid (melting point 16.5 °c) in water. at room temperature (25 °c), vinegar is an example of a ________ solution.
At room temperature, vinegar is an example of a liquid solution, as acetic acid is in a liquid state when dissolved in water. The empirical and molecular formulas of acetic acid can be found using its percentage composition and molar mass.
Explanation:Vinegar is a solution of acetic acid (melting point 16.5 °C) in water. At room temperature (25 °C), vinegar is an example of a liquid solution. This is because at room temperature, acetic acid is above its melting point and thus exists in the liquid state, dissolving in water to form a solution.
To determine the empirical formula of acetic acid with the given percentage composition of 39.9% carbon, 6.7% hydrogen, and 53.4% oxygen, one would start by assuming 100 grams of substance to convert percentages to grams directly. Then, for each element, the number of moles is found by dividing by the atomic mass (C:12.01 g/mol, H:1.008 g/mol, O:16.00 g/mol), followed by dividing by the smallest number of moles to get the ratio.
Where are elements that form molecules of two of the same atoms commonly found on the periodic table?
Do the number of atoms you start with affect the outcome of half life
A reagent bottle on the shelf labeled 0.5m nacl was used in place of the 0.5 m cacl2. assuming c2o4^2- to be in excess, what would be observed as a result of using this wrong reagent in this test? explain
What will happen when 200ml of 3.0m naoh and 100ml of 3.0 m hcl are combined?
Lesson 04.01: Chemical vs. Physical Changes and Properties Define and identify chemical and physical properties and changes. Give examples of physical and chemical properties and changes. Compare and contrast chemical and physical properties and changes.
A chemical property and a physical property are related to chemical and physical changes of matter.
Answer: A physical property is an aspect of the matter that can be observed or measured without changing it. Examples of physical properties include color, molecular weight, and volume.
A chemical property may only be observed by changing the chemical identity of a substance.
This property measures the potential for undergoing a chemical change. Examples of chemical properties include reactivity, flammability and oxidation states.
Answer:
A chemical property and a physical property are related to chemical and physical changes of matter.
Answer: A physical property is an aspect of the matter that can be observed or measured without changing it. Examples of physical properties include color, molecular weight, and volume.
A chemical property may only be observed by changing the chemical identity of a substance.
This property measures the potential for undergoing a chemical change. Examples of chemical properties include reactivity, flammability and oxidation states.
Explanation:
A calorimeter contains 280.0g of water at 13.5C. When 0.250g of a substance with a molar mass of 510.0g/mol is dissolved, the temperature of the resultant solution increases to 17.5C. Assume that the specific heat and density of the resulting solution are equal to those of water, 4.18J/gC and 1.00 g/mL, respectively and assume that no heat is lost to the calorimeter itself, nor to the surroundings. Calculate the amount of heat in Joules released by dissolving the substance.
The change in heat is simply equal to:
change in heat ΔH = final enthalpy – initial enthalpy
ΔH = [280.25 g * 4.18J/gC * (17.5°C)] – [280 g * 4.18J/gC * 13.5°C]
ΔH = 4,699.89 J = 4.7 kJ
Hence heat released is about 4.7 kJ
30) In adults, the function of the yellow marrow is to:
A) store adipose tissue
B) form blood cells
C) store calcium and phosphorus
D) cause lengthwise growth in long bones
E) decrease friction at joint surfaces
31) The presence of an epiphyseal plate indicates that:
A) bone is dead
B) bone length is no longer increasing
C) bone diameter is increasing
D) bone diameter is decreasing
E) bone length is increasing
32) The bone cells that respond to parathyroid hormone (PTH) to destroy bone matrix and release calcium into the blood are called:
A) osteocytes
B) chondrocytes
C) erythrocytes
D) osteoclasts
E) osteoblasts
33) A round or oval opening through a bone is a:
A) facet
B) fossa
C) foramen
D) fissure
E) trochanter
34) Which of the following bones is NOT considered part of the appendicular skeleton:
A) femur
B) sternum
C) radius
D) metatarsals
E) scapula
35) What kind of tissue is the forerunner of long bones in the embryo:
A) elastic connective tissue
B) dense fibrous connective tissue
C) fibrocartilage
D) hyaline cartilage
E) loose fibrous connective tissue
36) Which of the following is an example of a bone that forms from fibrous membranes:
A) the parietal bone
B) the radius
C) the humerus
D) the femur
E) the tibia
37) There are four stages in the healing of a bone fracture. Which of the following best illustrates the sequence of these stages:
1. bony callus formation 3. fibrocartilage callus formation
2. bone remodeling 4. hematoma formation
A) 4, 3, 2, 1
B) 4, 3, 1, 2
C) 1, 2, 3, 4
D) 1, 3, 4, 2
E) 1, 3, 2, 4
38) A compound fracture can be described as when:
A) the bone is crushed
B) the broken bone ends are forced into each other
C) the broken bone is exposed to the outside
D) the bone is broken into many fragments
E) adjacent bones fracture simultaneously
39) The axial skeleton contains:
1. skull
2. arms and legs
3. ribs and sternum
4. vertebrae
5. pelvic girdles
A) 1, 3, 4, 5
B) 1, 3, 4
C) 2, 5
D) 2, 3, 4, 5
E) 1, 2, 3, 5
40) The fibrous connections between the bones of a fetal skull are:
A) alveolar margins
B) sinuses
C) palate
D) crista galli
E) fontanels
41) Which of these bones is associated with the hand:
A) talus
B) calcaneus
C) metatarsals
D) tarsals
E) metacarpals
42) The hyoid bone is unique because:
A) it is the only bone of the body that does not directly articulate with any other bone
B) it has an unusual shape
C) it is covered with mucosa
D) it has no specific function
E) it largely consists of cartilage
43) How many true ribs do humans have:
A) three
B) five
C) seven
D) twelve
E) fifteen
44) The atlas is the:
A) last lumbar vertebra
B) first thoracic vertebra
C) part of the sacrum
D) second cervical vertebra
E) first cervical vertebra
45) Which is the correct order of ribs, from superior to inferior:
A) floating ribs, true ribs, false ribs
B) floating ribs, false ribs, true ribs
C) true ribs, false ribs, floating ribs
D) true ribs, floating ribs, false ribs
E) false ribs, floating ribs, true ribs
46) The sternum is the result of fusion of three bones called the:
A) ischium, ilium, coccyx
B) pubis, ischium, ilium
C) manubrium, body, xiphoid process
D) jugular notch, sternal angle, xiphisternal joint
E) true ribs, manubrium, xiphoid process
47) Which two bones constitute the forearm:
A) radius and humerus
B) humerus and scapula
C) fibula and tibia
D) ulna and radius
E) femur and fibula
48) The tailbone is the:
A) ischium
B) sacrum
C) pubis
D) coccyx
E) patella
49) Which of the following is correct of the female pelvis when comparing it with the male pelvis:
A) the angle of the female pubic arch is smaller
The answer provides responses to a series of questions about bone anatomy and physiology. Key concepts covered include the function of yellow marrow, the meaning of an epiphyseal plate, the bone cells that respond to parathyroid hormone, and specific bone structures such as foramen, sternum, hyaline cartilage, atlas, and coccyx.
Explanation:The respective answers to the given questions are as follows:
In adults, yellow marrow's function is to store adipose tissue (A).Presence of an epiphyseal plate indicates that bone length is increasing (E).Osteoclasts (D) responds to parathyroid hormone to destroy bone matrix and release calcium.A round or oval opening through a bone is called a foramen (C).Sternum (B) is not part of the appendicular skeleton.Hyaline cartilage (D) is the tissue precursor of long bones in an embryo.The parietal bone (A) forms from fibrous membranes.The stages in the healing of a bone fracture are 4, 3, 1, 2 (B).A compound fracture is when the broken bone is exposed to the outside (C).The axial skeleton contains the skull, ribs, sternum, and vertebrae (B).The fibrous connections between the bones of a fetal skull are fontanels (E).Metacarpals (E) is associated with the hand.The hyoid bone is unique because it doesn't directly articulate with any other bone (A).Humans have seven true ribs (C).The atlas is the first cervical vertebra (E).The order of ribs from superior to inferior is true ribs, false ribs, and floating ribs (C). The sternum results from the fusion of the manubrium, body, and xiphoid process (C). Radius and ulna (D) constitute the forearm.The tailbone is also known as the coccyx (D).Learn more about Bone Anatomy and Physiology here:
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How many kilocalories are involved in the production of 33.68 g of NH3?
I believe that the balanced chemical equation is:
3H2(g)+N2(g)→2NH3(g), ΔH = -21.9 kcal
We can see that 21.9 kcal of heat is released for every 2 moles of NH3.
The molar mass of NH3 is 17 g/mol, hence:
moles NH3 = 33.68 g / (17 g/mol)
moles NH3 = 1.98 mol
The total energy released is:
total heat = (-21.9 kcal / 2 mol) * 1.98 mol
total heat = -21.70 kcal
It takes 26.8 mL of a 0.0700 M NaOH standard solution to neutralize a 250 mL sample of lactic acid (C3H6O3). What mass of lactic acid was dissolved in the sample?
The complete balanced chemical reaction for this would be:
NaOH + C3H6O3 --> NaC3H5O3 + H2O
So we see that exactly 1 mole of NaOH reacts with 1 mole of lactic acid.
Calculate moles of NaOH.
moles NaOH = 0.07 moles/L * 0.0268 L
moles NaOH = 1.876 x 10^-3 mol
So,
moles C3H6O3 = 1.876 x 10^-3 mol
The molar mass of lactic acid is 90.08 g/mol so the mass is:
mass C3H6O3 = (1.876 x 10^-3 mol) * 90.08 g/mol
mass C3H6O3 = 0.169 g
The compound aluminum nitrate is a strong electrolyte. Write the reaction when solid aluminum nitrate is put into water:
AI(NO3)3 + 3H20 -----> AI(OH)3 + 3H + 3N03-
What are some applications of the field of spectroscopy?
Answer:
for identifying elements in a sample
for determining the distance and velocity of galaxies
for producing neon lights
for determining types of chemical bonds
for use in medical imaging devices
Explanation:
Hello,
Field spectroscopy, is a technique used to measure the reflectance properties of vegetation, soils, rocks, and water bodies in the natural environment, generally under solar illumination. Some disciplines are interested in the measurement of light reflected off objects in the natural environment. Natural targets are usually illuminated by the whole hemisphere of the sky, and thus receive direct solar flux and scattered sky light, thus, it can be applied for determine elements in a sample as each one reflects the light differently, for determining the distance and velocity of galaxies as one could measure the light velocity, for producing neon lights , for determining types of chemical bonds as they have measurable energies related with the reflected light and for use in medical imaging devices to determine patrons in the obtained results.
Best regards.
Cocl2 is often used in hygrometers. search the internet to determine why? how does this relate to this experiment?
PLEASE HELP ASAP!!!!!!!!!!!!! I dont understand this stuff at all.........
We know that standard pressure is one atmosphere, or 760 millimeters of mercury. This pressure results from the weight of gas molecules in the atmosphere. As a diver enters the water, he is subject to both water pressure and air pressure. Because water is much denser than air, the pressure increases rapidly as the diver descends. At the depth of 34 feet in fresh water, the diver is experiencing 2 atmospheres of pressure (one from air pressure and one from the 34 feet of water). For every additional 34 feet the diver descends he will be under an additional atmosphere of pressure. Since water pressure is proportional to depth, how many atmospheres of pressure would a diver experience at 102 feet? Why wouldn't this pressure squash the diver? Answering this second question may be easier if you think of the reason a person on land is not squashed by one atmosphere of pressure. Explain your answer in detail.
When a diver enters the water, they experience both water pressure and air pressure. As the diver descends, the pressure exerted by the water increases because water is denser than air. The pressure is measured in atmospheres, with one atmosphere being equal to 760 millimeters of mercury or the normal atmospheric pressure at sea level.
At a depth of 34 feet in fresh water, the diver experiences 2 atmospheres of pressure. This includes one atmosphere from the air pressure above the water's surface and an additional atmosphere from the 34 feet of water. For every additional 34 feet the diver descends, they will encounter an extra atmosphere of pressure.
To calculate the pressure at 102 feet, we can divide the depth by 34 (since each 34 feet corresponds to one additional atmosphere of pressure).
102 feet / 34 feet = 3 atmospheres of pressure
Therefore, at a depth of 102 feet, a diver would experience 3 atmospheres of pressure.
Now, you might wonder why this pressure doesn't squash the diver. The reason is similar to why a person on land is not squashed by one atmosphere of pressure. Our bodies are made up of fluids and tissues that can withstand and equalize the pressure. When a person is at sea level, the air pressure around them is balanced by the air pressure within their body. Similarly, when a diver descends into the water, the increased water pressure is balanced by the internal pressure within their body. This balance prevents the diver from being squashed by the external pressure. However, it is important for divers to follow safety guidelines and gradually ascend to allow their bodies to adjust to changes in pressure and avoid decompression sickness.
Butane (C4H10) is used as a fuel where natural gas is not available. How many grams of butane will fill a 3.50-liter container at 35.6 °C and 758 torr? I've put the values through n = PV/RT to get n = 0.0138 and then converted to grams to get 0.77423g but it's not the right answer on my practice midterm. Any help is gratefully appreciated!
A cube of aluminum is 20 cm on edge. aluminum has a density of 2.7 g/cm3 and a specific heat of 0.217 cal/g0c. what is the heat in calories needed to raise the temperature of the cube from 200 to 3000c?
A common unit of energy is the calorie. A calorie is defined as the amount of heat that is needed to raise the temperature of one gram of water one degree centigrade. Modern convention uses a unit of energy called a joule. A calorie is equal to 4.184 joules. A joule is approximately the energy needed to lift 2000 grams a distance of 10 centimeters.
Heat is transferred by either direct transfer from one object touching another or by the emission of radiation in the form of infrared radiation. Two results can occur as a result of this transfer of thermal energy. A substance can undergo either a change in temperature or a change in physical state.
When a substance exchanges heat with its surroundings without changing its physical state, the substance will undergo a change in temperature. This change in temperature depends on a property called specific heat capacity.
Specific heat capacity is the "heat needed to produce a given temperature change (in Celsius or Kelvin) per gram of substance" and is expressed in the units J/gK. Specific heat capacity depends on both the type of substance and the mass of the substance.The "D" means "change in" and "q" represents the quantity of heat.
Suppose 4 moles of a react with excess amount of b to produce 382.5 g of c, calculate the percent yield of
c. (the molar mass of c is 310.2 g/mol)
Give the number of significant figures in this number: 0.070
Answer:
Significant figures in number '0.070' is 2.
Explanation:
Significant figures : The figures are the numerals which express the value of magnitude of a quantity to a specific degree of accuracy also called significant digits.
0.070 = [tex] 7.0\times 10^{-2][/tex]
Significant figures in number '0.070' is 2.
All zero’s preceding the first integers are never significant. For example: 0.00748 has three significant figures. All zero’s after the decimal point are always significant. For example: 4.800, 85.00 and 250.0 all have four significant figures.For a solution of acetic acid in water list the major species in decreasing order of concentration
In a solution of acetic acid in water, the major species present in decreasing order of concentration are acetic acid, water, the acetate ion, and the hydronium ion. This is due to the partial ionization of acetic acid in water and the reaction's equilibrium state.
Explanation:When acetic acid (CH3CO2H) is dissolved in water, it partially dissociates into ions. The major species present in the solution would be acetic acid (CH3CO2H), water molecules (H2O), the acetate ion (CH3CO2), and the hydronium ion (H3O+), listed in this order due to the partial ionization of acetic acid and the existence of the reaction in equilibrium.
The equation for this process can be shown as: CH3CO2H(aq) + H2O(l) ⇌ CH3CO2¯(aq) + H3O+(aq)
Because acetic acid is a weak acid, it only partially ionizes in water, which means that the majority of the molecules remain in the undissociated form (acetic acid), followed by water (as solvent), and significantly lower concentrations of the acetate ions and hydronium ions counted per unit volume of the solution.
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if 4.35 KJ of
heat is added to 15.5 g of water at 5.00 Celsius what will be the result in state and temp of the water
What is the momentum of a 66-kilogram ice skater gliding across the ice at a speed of 7 m/s
Write the ground state electron configuration of w using the noble-gas shorthand notation.
Tungsten contains 74 electrons in total. The electronic configuration of tungsten can be written as [Xe] 4F¹⁴ 5d⁴ 6s².
What is tungsten?
Tungsten is 74th element in periodic table. It is a d -block element and is classified as a transition metal. Tungsten have potential application in electronic devices. The filaments of electric bulb are made by tungsten.The latin name of tungsten is wolfram. That's why it has the symbol W.
Noble gases have completely filled orbitals and their electronic configuration is fully filled in all orbitals. Therefore, using the noble gas notation we can represent the configuration of other elements.
Tungsten have 74 electrons. Xenon a noble gas have 54 electrons . Thus all the orbitals are completely filled. W can be written using Xe. Thus remaining 20 electrons have to specified in corresponding orbitals. Hence, the configuration of W is [Xe] 4F¹⁴ 5d⁴ 6s².
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Draw the most stable lewis structure of acrolein.
The most stable Lewis structure of acrolein is attached in image below.
Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
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Calculate the number of grams of hcl that can react with 0.470 g of al(oh)3.
To calculate the number of grams of HCl that can react with Al(OH)3, use the balanced chemical equation and stoichiometry. 0.470 g of Al(OH)3 reacts with approximately 1.32 g of HCl.
Explanation:To calculate the number of grams of HCl that can react with 0.470 g of Al(OH)3, we need to use the balanced chemical equation and stoichiometry. The balanced equation for the reaction between HCl and Al(OH)3 is:
6HCl + Al(OH)3 → 3H2O + AlCl3
From the equation, we can see that 6 moles of HCl react with 1 mole of Al(OH)3. To find the number of moles of HCl, we can use the molar mass of Al(OH)3 (78.0 g/mol) to convert the mass of Al(OH)3 to moles. Then, we can use the stoichiometry to calculate the number of moles of HCl. Finally, we can use the molar mass of HCl (36.46 g/mol) to convert moles of HCl to grams. Let's do the calculations:
Calculate moles of Al(OH)3: 0.470 g / 78.0 g/mol = 0.00603 molCalculate moles of HCl using stoichiometry: 0.00603 mol Al(OH)3 × (6 mol HCl / 1 mol Al(OH)3) = 0.0362 mol HClCalculate grams of HCl: 0.0362 mol HCl × 36.46 g/mol = 1.32 g HClTherefore, the number of grams of HCl that can react with 0.470 g of Al(OH)3 is approximately 1.32 g of HCl.
Why did the better part of century pass between Thompson’s work and Dalton’s work
What does the 3 indicate in 1s22s22p63s1? the third shell third sublevel last shell has 3 electrons none of the above
Answer:
The answer is the Third sublevel. Hope this helps
Explanation:
Explain why an anion exchange resin can be used to separate a mixture of cations
True or false: Driving a motor vehicle after taking substances which alter The central nervous system can have side effects which include impaired attention reaction time and vision
____ 46. the number of electrons present in the s orbitals in the outermost electron shell of the alkaline earth (group iia) metals is ____.