Physical properties such as mass, weights , density can be common for one or more substances hence cannot be used for identification while magnetism is unique for each substance ,hence used for identification.
What are physical properties?Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.
Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.
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Problems that can be caused by both the complete and incomplete
combustion of methane in a gas fire.
Answer:
carbon dioxide produced, or carbon monoxide, soot produced and Soot can cause breathing problems and it blackens buildings.
Explanation:
During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During incomplete combustion part of the carbon is not completely oxidized producing soot or carbon monoxide (CO).
For each of the following molecules, would you expect greater solubility in water or in hexane?
a. toluene
b. sucrose (table sugar)
c. isobutene
d. ethylene glycol
Answer:
a
Explanation:
boiling point of 111ºC and hexane, with a boiling point of 69ºC, is 42ºC, making these two substances most easily separated
When you go to the doctor for an illness, the doctor asks you how you feel. You describe all your symptoms. Then, the doctor makes a hypothesis about which organ system is having problems. Read each set of symptoms below. Then, match each set of symptoms with the the appropriate organ system.
stomach ache, gassy, ___________________________
no appetite
sneezing all the time, runny nose, __________________________---
trouble breathing, coughing
having a very hard time remembering people's
names, feeling sad and anxious _______________________
seem to be catching every disease that comes around,
taking a long time to get better ________________________-
1. Respiratory System
2.Nervous System
3.Immune System
4.Digestive System
Stomach ache, gassy ,no appetite is related to problems with digestive tract while sneezing all the time, runny nose is related to respiratory system while having a very hard time remembering people's is related to nervous system while seeming to be catching every disease that comes around,taking a long time to get better is related to immune system.
What is digestive tract?
It consists of the gastrointestinal tract along with the accessory organs which are present in digestion process . It involves the breakdown of complex food into smaller components which can be easily assimilated and absorbed by the body.
The digestion process has 3 phases: cephalic phase , gastric phase and intestinal phase.Cephalic phase begins with secretion of gastric juices from gastric glands in response to sight and smell of food.It involves chewing and chemical breakdown of food by the action of digestive enzymes ,saliva in the mouth contain enzymes like lipase and amylase which are secreted by the salivary and serous glands present on the tongue.
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In this redox reaction, identify the element that was reduced. Fe2O3 3CO 2Fe 3CO2 A. C B. CO C. Fe D. FeO E. O
the element that was reduced in this redox reaction is Fe
A redox reaction, also known as an oxidation-reduction or redox reaction, involves the exchange of electrons between chemical entities (the atoms, ions, or molecules involved in the reaction). Redox reactions occur everywhere; they are involved in the burning of fuels, the rusting of metals, and even the processes of photosynthesis and cellular respiration.Some species experience oxidation, or the loss of electrons, while others experience reduction, or the gain of electrons, during a redox process. Take rust, which results from the interaction of iron and oxygen:The third selection from the options presented above is the right response. The element that was reduced in the described redox reaction was Fe, or iron. It now has a neutral charge after having its +3 charge lowered.
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how many sublevels are in Silicon
There is 5 orbitals!
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The theoretical yield of NaBr from 2.36 mol FeBr3 is 7.08 mol NaBr. What is the percent yield if 6.14 mol NaBr were collected?
The percent yield for the reaction in this example is 100%, which is equal to the theoretical yield of NaBr from 2.36 mol FeBr3 of 7.08 mol NaBr.
What is NaBr's theoretical yield?The lesser amount, or 13.7 g NaBr, represents the potential yield. 15.45 grams of NaBr can never be produced because after 13.7 grams of NaBr are created, the reaction runs out of NaI and stops generating NaBr product. As the limiting reactant, NaI is well-known.
How is % yield determined?The final answer is expressed in percent by dividing the experimental yield by the theoretical yield and multiplying the result by 100. In general, the percent yield value is less than 100%,
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Answer: 87%.
Explanation:
I need to know the Lewis structure for
CCI4
H2O
O2
N2
PH3
Please and thank you.
Two solitary sigma bonds are visible in the Lewis structure between the hydrogen and oxygen atoms.
What is Lewis structure explain with example?The octet rule is a theory that describes how atoms share electrons so that each atom has eight electrons in its outer shell. This idea is the foundation of a Lewis structure. An oxygen atom, as an illustration, has six electrons in its outer shell.
The entire molecule's electron density is concentrated only around the core C in the CCl4 Lewis structure. Two nitrogen atoms are connected by a triple bond in the N2 Lewis structure.
In the reaction described above, PH3 is acting as a Lewis base because of the single electron on the P atom.
A double bond exists between two oxygen atoms in the Lewis structure of O2. Oxygen atoms must form two bonds in order to comply with the octet rule. The oxygen (red) and hydrogen (white) atoms are held together by powerful connections known as covalent bonds.
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When methane is burned with oxygen, the products are carbon dioxide and water, If you produce 20 grams of water and 10 grams of carbon dioxide from 15 grams of oxygen, how many grams of methane were needed for the reaction?
Answer:
4 g
Explanation:
First you need to write a balanced chemical equation. You are given thatmethane is burned, meaning a combustion reaction in which carbon dioxide and water are released.
Unbalanced: CH4 + O2 ---> CO2 + H2O
Balanced: CH4 + 2O2 ---> CO2 + 2H2O
Givens:
X grams CH4 (Molecular mass 16.0 grams)
9 grams H2O (Molecular mass 18.0 grams)
11 grams CO2 (Molecular mass 44.0 grams)
Mole ratio: 1:2:1:2 (CH4:O2:CO2:H2O)
Then you need to find which of the reactants are the limiting reactant and which is the excess reactant. The limiting reactant is what you will base the rest of the problem on. To do this, you convert each measurement to moles from grams.
11 g CO2 / (44.0 g) = 0.25 moles CO2
9 g H2O / (18.0 g) = 0.5 moles
n of CH4 = n of CO2 = n of H2O /2 = 0.25 moles
m of CH4 = n* Mw = 0.25 * 16.0 = 4 g
A 46 g piece of metal at 250C is placed in a calorimeter with 500. mL of water at 20C. If the final temperature was 24C, the specific heat of the metal is what?
2
An acid reacts with zinc to produce zinc chloride and hydrogen.
Which acid reacts with zinc to produce zinc chloride?
Tick () one box.
Hydrochloric acid
Nitric acid
Sulfuric acid
Answer:
Hidrochloric Acid
Explanation:
How can distance be measured?
Distance can be measured by centimeters (cm) and kilometers (km).
Distance is defined as the total movement of an object without any regard to the direction. Distance is the length of the route between the two points.
SI unit of distance is the meter (m). Short distances may be measured in the centimeters (cm), and the long distances may be measured in kilometers (km). For example: Measure the distance from the bottom to the top of a sheet of paper in centimeters and the distance from your house to your school. Maps are also used to measure the the distance.
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write the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2
the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2 is -1 and 0
An atom's oxidation number (also known as oxidation state) in a chemical is an amount that represents the amount of electron density gained or lost by the atom during in the formation of the compound. In general, the oxidising number of an element in a compound can be determined using the following rules: n element's oxidising number is null whenever it is unrestricted (uncombined). The oxidation number of a polyatomic ion is equivalent towards the ion's charge. We can use these rules to calculate the oxidation number of the oxygen atoms in H2O2 and O2: In H2O2, the oxidation number of the oxygen atoms is -1. This is because the compound is neutral and the hydrogen atoms have an oxidation number of +1, so the oxygen atoms must have an oxidation number of -1 in order for the sum of all the oxidation numbers to be zero. In O2, the oxidation number of the oxygen atoms is 0. This is because the compound is a diatomic molecule and the oxidation number of the free element oxygen is 0.
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Make a claim about how exercise affects the balance of salt and water in your body
what chemical is 60% of your food made up of? what 3 elements make up this chemical?
Carbohydrates, is 60% of what your food made up of and it is composed of carbon, hydrogen and oxygen.
What are carbohydrates?Carbohydrates are known to be the group of organic compounds that are an important source of energy for the body. They are composed of carbon, hydrogen and oxygen and are classified as simple or complex depending on their chemical structure. Monosaccharides, also called monosaccharides, include glucose, fructose, and galactose, and are found in foods such as fruit, table sugar, and honey. Complex carbohydrates, also called polysaccharides, contain starches and fibers and are found in foods such as grains, legumes, and vegetables. Carbohydrates play an important role in providing energy for the body, maintaining proper brain and nervous system function, and supporting tissue growth and repair.
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what is cause of gastritis
Answer:
Gastritis can be caused by irritation due to excessive alcohol use, chronic vomiting, stress, or the use of certain medications such as aspirin or other anti-inflammatory drugs. It may also be caused by any of the following:
Helicobacter pylori (H. pylori): A bacteria that lives in the mucous lining of the stomach; without treatment, the infection can lead to ulcers, and in some people, stomach cancer. Bile reflux: A backflow of bile into the stomach from the bile tract (that connects to the liver and gallbladder. Infections caused by bacteria and viruses.If gastritis is left untreated, it can lead to a severe loss of blood and may increase the risk of developing stomach cancer.
A chemist has 200 mL of a 10% sucrose solution. If she adds x milliliters of a 40% sucrose solution, what is the percent concentration of the final mixture
The final concentration of the mixture depends on the value of x.
What is value?Value is the worth of something. It can refer to the monetary worth of an item or service, the usefulness of something, or the importance of an idea, belief, or experience. Value is a subjective concept and can vary from person to person. Generally, it is the positive attributes that an individual or group associates with something that determines its value. The economic concept of value is based on the idea that the value of a good or service is determined by its cost, supply, and demand.
The final concentration of the mixture is equal to:
(200 mL x 10%) + (x mL x 40%) / (200 mL + x mL)
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Determine the electron geometry (eg) and molecular geometry (mg) of NCl3.
O eg=tetrahedral, mg=trigonal pyramidal
O eg=linear, mg=trigonal planar
O eg=tetrahedral, mg=tetrahedral
O eg=linear, mg=linear
O eg=trigonal planar, mg=bent
The correct answer is : Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons
O eg=tetrahedral, mg=trigonal pyramidal
The electron geometry (eg) of NCl3 is determined by the positions of the electrons around the central atom, nitrogen (N). NCl3 has one lone pair of electrons on nitrogen and three bonding pairs of electrons with chlorine atoms, so the electron geometry is tetrahedral. NCl3's molecular geometry (mg) is determined by the atom positions in the molecule. In a trigonal pyramidal shape, NCl3 has one nitrogen atom in the centre and three chlorine atoms surrounding it. Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons. Electron geometry, also known as electron pair geometry, is the arrangement of electron pairs in a molecule or ion around a central atom. It is determined by the number of electron pairs surrounding the central atom, which includes both bonding pairs and lone electron pairs. The electron geometry can be used to predict the overall shape of a molecule or ion and also helps to understand the polarity of the molecule.
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What is the height of a column of water which can be supported by a pressure of exactly 1 bar (=100 kPa = 750.0 mmHg) at 25 ℃?
Answer:
10.33 meters (33.78 feet).
Explanation:
1 bar = 10.33 mH₂O, 1 mH₂O = 0.098 bar, hence 10.33 mH₂O/0.098 bar = 10.33 m.
How many moles is 1.5 x10 20?
2.49 x [tex]10^{-4}[/tex] moles is equal to 1.5×[tex]10^{20}[/tex]. The number of moles is equal to the number of molecules divided by Avogadro's number, 6.022×[tex]10^{23}[/tex].
This means that 1.5×[tex]10^{20}[/tex]moles are equal to
1.5×[tex]10^{20}[/tex]/6.022×[tex]10^{23}[/tex]
0.24908×[tex]10^{-3}[/tex]
2.49 x [tex]10^{-4}[/tex] moles.
Avogadro's number: Avogadro's number is a constant used in chemistry to represent the number of atoms or molecules in a mole of a substance. It is equal to 6.022 x [tex]10^{23}[/tex]. Or we can say that Avogadro's number is, the number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.
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please help with this question
Which freezes faster, hot water or cold water?
Answer: Hot water freezes faster.
Explanation: It is because of the Mpemba effect taking place, and even though it seems impossible, it could have less dissolved gas in it, or even take up less mass because of this.
What is the concentration if I have 200 mL of water and dissolve 13g of salt in it? Show your work!
Answer:
The concentration is 0.065g/mL
Explanation:
Given
[tex]m = 13g[/tex] --- mass of salt
[tex]V =200mL[/tex] --- volume of water
Required
Determine the concentration (C)
This is calculated as:
[tex]C = \frac{m}{V}[/tex]
[tex]C = \frac{13g}{200mL}[/tex]
[tex]C = \frac{13}{200}g/mL[/tex]
[tex]C = 0.065g/mL[/tex]
The concentration is 0.065g/mL
Why do you think the author chose to organize the information this way
How many moles of MgCO3 are present in 252. 939 grams of MgCO37
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The number of moles of MgCO3 that is present in the given mass of magnesium carbonate is 2.99 moles.
The number of moles can be defined as the ratio of given mass over molar mass. The chemical that is given is magnesium carbonate having molar mass of 84.314 g/mol and the given mass of the same is 252.939 grams.
The formula for number of moles that is 'n' can be given as follows:
n= m/M where m is the given mass and M is the molar mass.
Substituting the values,
n= 252.939 grams /84.314 grams/mol
n=2.99 moles
Therefore, the number of moles of MgCO3 is 2.99 moles.
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What mass of silver chloride can be prepared by the reaction of 170.0 mL of 0.23 M silver nitrate with 200.0 mL of 0.18 M calcium chloride
2.87 g of silver chloride can be made by reacting 200.0 mL of calcium chloride with 170.0 mL of silver nitrate, both of which have a 0.23 M silver nitrate concentration. Chemically, silver chloride is a substance.
AgCl is the chemical formula for this. It is generally known that this white crystalline substance is only weakly soluble in water. Silver chloride changes from grey to black or purplish in hue upon illumination or heating, indicating the presence of silver. As the mineral chlorargyrite, AgCl can be found in nature. Chemical processes take place everywhere around us, from the food our bodies metabolize to how the sunlight we receive is produced.
silver chloride mass: m (AgCl)=0.02*143,32g/mole=2.87 g, where n (AgCl) = (0.02*2)/2=0.02 moles.
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How many grams of mercury can be produced if 18.0 g of mercury (11) oxide decomposes?
Answer:
m = 16.67 g of Hg
Explanation:
Let's write the overall decomposition reaction that is taking place:
2HgO ---------> 2Hg + O₂
According to the balanced reaction, we can see that the mole ratio between HgO and Hg is the same (2:2 or 1:1), therefore, we can assume that the moles reactants of HgO would be the moles produced of Hg. So, in order to get the grams of mercury, we need to determine the moles first.
To get the moles, we need to use the following expression:
moles = mass / MM (1)
The molar mass of HgO can be calculated using the atomic weights, which are:
Hg: 200.59 g/mol ; O: 15.999 g/mol
MM HgO = 200.59 + 15.999 = 216.589 g/mol
The moles are:
moles HgO = 18 / 216.589 = 0.0831 moles
As we stated before, moles reactants are the same moles produced, so:
moles HgO = moles Hg = 0.0831 moles of Hg.
Finally, to get the mass, we just solve the mass from (1):
m = moles * MM (2)
m = 0.0831 * 200.59
m = 16.67 g of HgHope this helps
what is the total random kinetic energy of all the molecules in one mole of hydrogen at a temperature of 300k
The total random kinetic energy of all the molecules in one mole of hydrogen at a temperature of 300k is 3741.3 J.
Given temperature (T) = 300K
The number of moles of hydrogen given are (n) = 1
Molecular weight of hydrogen (M) = 1g
Let the kinetic energy = KE
We know that Kinetic Energy (KE) = 1.5nRT where R = Rydbergs constant
So, KE (total) = 1.5nRT,
the total random kinetic energy is KE = (1.5) x (1) x (8.314) x (300) = 3741.3J/mol
The energy of motion is known as kinetic energy, and it can be observed in the motion of objects or subatomic particles. Examples of kinetic energy in action include a person walking, a baseball soaring through the air, a piece of food falling from a table, and a charged particle in an electric field.
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Which of the following does NOT normally exist as a diatomic molecule? *
PLS HELP ME I NEED HELP
Oxygen gas
Chlorine gas
Helium gas
Nitrogen gas
Hydrogen gas
Answer:
Helium gas
Explanation:
a method you could use to remember the Diatomic molecules is HOFBrINCl
which stands for all of the Diatomic molecules and as you could observe Helium is not included!
Answer:
Helium gas
Explanation:
because it's helium :/
Select the correct answer. given: sno2 2h2 → sn 2h2o tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?
a. 1.57
b. 4.21
c. 634.8
d. 59,350
4.21 moles of SnO₂ are needed to produce 500.0 grams of Sn for the given reaction.
What is tin oxide reaction?Tin oxide, is a compound with the formula SnO₂. It is a white or gray powder that is insoluble in water but soluble in strong acids and strong alkalis. Tin oxide is widely used as a pigment in ceramics, glasses, and paints, and in the manufacture of electronic devices such as transistors and solar cells. It is a versatile compound with a wide range of uses and can undergo several important reactions such as: Reduction to tin metal, formation of tin dioxide, formation of tin salts by reaction with acids.
For the given reaction:
SnO₂ + 2H₂ → Sn + 2H₂O
Mole ratio of SnO₂ and Sn is 1:1; this means 1 mole of SnO₂ is required to prepare each mole of Sn.
Now, for the moles of Sn:
n = m/M
Where, n = number of moles
m = mass of Sn (500 g)
M = molar mass of Sn (118.71 g/mol)
n = 500/118.71
n = 4.21 moles
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Awarding 50 points for this question!!
From the paragraph in the image, what are the independent, dependent, and control variables?
Answer:
there is no paragraph
Explanation: