Which fat is most likely a solid at room temperature? one that is saturated one that is unsaturated one with double bonds one that contains no hydrogen
Answer: Option (a) is the correct answer.
When a fat contains high proportion of fatty acid molecules which have no double bonds then it is known as a saturated fat.
For example, animal fats are mostly saturated.
Fats which are solid at room temperature are known as solid fats. Butter, beef fat etc are all solid at room temperature. Most of the animal food gives solid fats.
Thus, we can conclude that saturated fat is most likely a solid at room temperature.
Lewis structures are shown below
- In Lewis structure of nitromethane, a negative charge is present on oxygen atom in nitro group.
- Hence this oxygen atom acts as a basic center preferably.
- Therefore conjugate acid of nitromethane should be drawn by adding a hydrogen atom with this oxygen atom.
- Lewis structure of nitromethane as well as it's conjugate acid has been shown below including all the lone pairs and formal charges
An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 2.50g of this compound produced 3.67g of carbon dioxide and 1.50g of water. How many moles of carbon, C, were in the original sample?
C + O2 = CO2
Molar mass CO2 = 44 g/mol
3.67 g CO2 * 1 mol / 44 g =
=0.0834 mol CO2 = 0.0834 mol C
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A teacher makes the following statement. “Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.” What topic is the teacher most likely talking about? a. distillation of a mixture b. filtration of a pure substance c.evaporation of a mixture d. sorting of a pure substance
The correct answer is option a.
According the question, boiling points of different liquids are discussed which means that if we take all these liquids in single mixture we can separate them from each other on the basis of their difference in boiling point. And the technique which employs this principle is distillation process.
Hence, we can say teacher is most likely talking about distillation of a mixture of oils.
Distillation is a process which is used to separate mixture of different liquids from each other. In this process, during the course of boiling of mixture liquid compound with lower boiling points vaporizes first leaving behind the liquid with higher boiling point behind.
And vapors of boiled liquid are condensed down in a separate container for the collection.
Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds? It can be shaped into wires. It has a low melting point. It conducts electricity when in solid form. It conducts electricity when it is dissolved in water.
Answer: Option (D) is the correct answer.
A ionic compound will have opposite charges on the 2 atoms attached to each other.
When ionic compound is in solid state then atoms will be more closer to each other and also due to the opposite charges the molecules will have strong force of attraction between them.
In order to conduct electricity, free movement of ions is required. So, a solid with ionic bonds is not able to conduct electricity as molecules or ions are closely held together.
Whereas when a substance that is composed of atoms that are held together by ionic bonds is dissolved in water then its ions will start to move freely from one point to another. Thus, this solution will be able to conduct electricity.
Thus, we can conclude that out of the given options, conducts electricity when it is dissolved in water displays a property of a substance that is composed of atoms that are held together by ionic bonds.
Sing pure water, set the room temperature to -10.0 °C and observe. What do you notice about the water temperature as the water is freezing? The water temperature stays constant at 0.0 °C as the water is freezing. The water temperature stays constant at 10.0 °C as the water is freezing. The water temperature continues to decrease as the water is freezing. The water temperature continues to increase as the water is freezing.
This is the fourth macro-molecule being described.
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A trisubstituted cyclohexane compound is given below in its chair conformation. Draw the corresponding planar (overhead) representation, using wedge-and-dash bonds to indicate the substituent positions. To be graded properly, include the hydrogen atoms on the chirality centers (asymmetric carbons). Be sure that both wedge/dash bonds are drawn on the outside of the ring, or else the stereochemistry may be interpreted as square planar.
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Answer: The products formed are potassium nitrate and silver bromide ( AgBr ).
Explanation: Double replacement or double displacement reactions are the reactions in which the positive ions and negative ions of the two reactants interchange to form the products. These reactions are carried out on the basis of their position in reactivity series.
The elements lying above in the reactivity series will be able to displace the elements that lie below in the reactivity series.
For the reaction of potassium bromide and silver nitrate, the reaction follows:
The resulting products are potassium nitrate and silver bromide ( AgBr ).
Why do amorphous solids not have a long-range order in the arrangement of their particles? Their formation involves very rapid cooling. They do not have enough particles. Their particles eventually change positions. Their particles always stay in the same positions.
I think A is right
How many grams of ammonia (NH3) are produced if 4 grams of hydrogen gas (H2) reacts with excess nitrogen gas (N2) according to the chemical equation below: 3 H2 + N2 à 2 NH3 2.43 g 4.86 g 11.33 g 22.66 g 1 points Save Answer QUESTION 6 Identify the limiting reactant if 5 g of N2 is allowed to react with 5 g of H2 according to the chemical equation given below. Determine the theoretical yield of the product NH3. 3 H2 + N2 à 2 NH3 limiting reactant is H2 ; theoretical yield = 6.07 g of NH3 limiting reactant is H2 ; theoretical yield = 28.33 g of NH3 limiting reactant is N2 ; theoretical yield = 6.07 g of NH3 limiting reactant is N2 ; theoretical yield = 28.33 g of NH3 1 points Save Answer QUESTION 7 For a given chemical reaction, the chemist determined the theoretical yield of product is equal to 15.1 grams. In the laboratory, the chemist only recovered 8.25 grams of product (the actual yield). Calculate the percent yield. 32.7% 48.9% 54.6% 82.3%
Base from the chemical reaction :3 H2 + N2 à 2 NH3
Given 4 g H2
Mass NH3 = 4 g H2 ( 1 mole H2 / 2 g H2) ( 2 mol NH3 / 3 mol H2) ( 17 g NH3 / 1 mol NH3)
mass NH3= 22.66 g NH3 produce from 4 g H2
Acetone and sodium chloride both have similiar mass. Explain why their other properties differ. Acetone: C3H6O, melting point = −94°C, liquid at room temperature, low electrical conductivity Sodium chloride: NaCl, melting point = 801°C, solid at room temperature, high electrical conductivity
properties of: ionic compounds contain has high boiling point and low electrical conductivity properties of: covalent bonding has low boiling points and high electrical conductivity.
Answer: The correct answer is saturated solution.
For the given options:
Dilute solutions are defined as the solutions in which solute particles are present in less very amount than the solvent particles.
Unsaturated solutions are defined as the solutions where more and more of solute particles can be dissolved in the given amount of solvent.
Saturated solutions are defined as the solutions where no more solute particles can be dissolved in the solvent. The concentration of the solute particles that can be dissolved in a solution is maximum.
Supersaturated solutions are defined as the solutions where more amount of solute particles are present than the solvent particles.
From the above information, we conclude that the given solution is saturated solution.
Water is a very unique substance because it can exist in all three phases of matter (solid, liquid, gas) within the normal temperature ranges found on Earth. When one observes the phase of matter of water, one observes a ________ property of matter.
Physical Because changing phases such as solid, liquid, gas are physical forms.
Most metals are solid at room temperature, malleable, ductile, good conductors of heat and electricity, and react in acids to produce hydrogen gas. Which of the properties mentioned is a chemical property? A) are malleable B) reacts with acids C) solid at room temperature D) are good conductors of heat
B)Reacts with acid !
Answer : AgOH is a solid.
AgOH can be produced from the reaction between NaOH(aq) and AgNO₃(aq). The balanced reaction equation is
NaOH(aq) + AgNO₃(aq) AgOH(s) + NaNO₃(aq)
AgOH is a brown color precipitate which has a Ksp value as 6.8 x 10⁻⁹. The molecular weight of AgOH is 124.88 g/mol.
In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide?
Calcium sulfide has molecular formula CaS. Calcium is a metal of group 2, and sulfur, a nonmetal of group 6, and they form an ionic compound, not a molecule.
So, calcium will give 2 electrons to sulfur, so both of them will have 8 electrons in their valence shell. All these electrons will be in pairs, so there will be 0 lone pairs of electrons.
Glucose is a simple sugar made up of carbon, hydrogen, and oxygen. What kind of molecule is glucose? A. Glucose is protein. B. Glucose is a nucleic acid. C. Glucose is an organic molecule. D. Glucose is an inorganic molecule
Glucose is carbohydrate so it cannot be a protein or a nucleic acid. It is an organic molecule. The organic molecule is compound consisting of carbon to which are attached hydrogen, oxygen, and nitrogen. Since, glucose is a simple sugar made up of carbon, hydrogen, and oxygen, it, as well as any other carbohydrate, is the organic molecule.
The answer is: four.
For example compound carbon dioxide (CO₂):
Electron configuration of carbon: ₆C 1s² 2s² 2p².
Electron configuration of oxygen: ₈O 1s² 2s² 2p⁴.
Carbon atom is sp2 hybridized, it has three sp2 orbitals and one p orbital, they form four bonds.
Oxygen has two p orbitals, they form two bonds (one sigma and one pi bond).
p orbitals from carbon and oxygen overlap and form pi bond.
A water molecule is composed of two hydrogen atoms and one oxygen atom arranged in a bent shape. Since oxygen is significantly more electronegative than hydrogen, oxygen atoms have a much stronger attraction to shared electrons than does hydrogen. This unequal sharing of electrons and bent shape results in water being called a _________________ . A) polar molecule B) magnetic molecule C) ionic molecule D) covalent molecule
Answer: A) polar molecule
Explanation: Polar molecules are molecules which contain atoms of different electronegativities.
Non polar molecules are molecules which contains atoms of same electronegativities.
Water is a polar covalent molecule formed by unequal sharing of electrons. Oxygen being more electronegative tend to keep the electron pair towards itself thus generating a partial negative charge. The hydrogen acquire a partial positive charge thus resulting in a polar molecule.
The bent shape is due to repulsion between lone pairs and bond pairs of electrons.
1.Build or draw the Lewis structure for each of the molecules listed below. H2O, NH3, CH4, CO2 2.Build or draw a model of each of the Lewis structures using any of the materials listed above. Here are the steps: a. For each molecule, represent each element with a spherical (ball shaped) object. b. Each single bond should be represented with a straight object, two straight objects should be used between two atoms to represent a double bond, and three straight objects should be used between two atoms represent a triple bond. c. Remember that the lone pairs on the central atom take up space and play a role in determining the shape of the molecule. Represent each lone pair (nonbonded pairs of valence electrons) on the central atom with a nonbonded object. The bonds and lone pairs on the central atom should be spread apart as much as possible. See example in lesson as a reference. For each of your molecular models, include a Lewis structure drawing or picture of your model. On your drawing or picture, include the following information: 1.What is the central atom? 2.How many atoms are bonded to the central atom? 3.How many lone pairs of electrons are on the central atom? 4.How many single bonds are there in this molecule? 5.How many multiple bonds (double and/or triple) are there in this molecule? For each of your molecules, answer the following questions: 1.Determine the electronegativity between the atoms of each molecule. 2.Identify the bond as either ionic or covalent. 3.State whether the molecule is polar or non polar. 4.Identify the structure as having hydrogen bonding, dipole-dipole moments or London dispersion forces (LDF).
Allright for H2O: - The central atom is? --> the oxygen atom - How many atoms are bonded to the central atom? --> 2 hydrogen atoms - How many lone pairs of electrons are on the central atom? --> O has 6 electrons and has 2 single bonds, so 2 pairs - How many single bonds are there in this molecule? --> 2 - How many multiple bonds (double and/or triple) are there in this molecule? --> none For each of your molecules, answer the following questions: 1. Determine the electronegativity between the atoms of each molecule. Electronegativity O = 3.44 Electronegativity H = 2.20 3.44-2.20=1.24, so the electronegativity between O and H = 1.24 2. Identify the bond as either ionic or covalent. Electronegativity of 0.0-1.7 = covalent Electronegativity of 1.7-3.3 = ionic So it's a covalent bond 3. State whether the molecule is polar or non polar. Electronegativity of 0.5-1.7= polar covalent 4. Identify the structure as having hydrogen bonding, dipole-dipole moments or London dispersion forces (LDF). H2O = hydrogen bonding
Which statement best relates to how the structure of a lipid influences the lipid’s function? The ends of the lipid are attached to each other. Lipids contain fatty acids and glycerol. A lipid is made up of a long chain of phosphorus molecules. A phospholipid has a charged head and an uncharged tail.
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Which of the following statements about horizons is true? a. They are characterized by whether they are solid, liquid, or gas. b. They are represented by Roman numerals. c. All soils have completely different horizon patterns. d. They are defined by their different physical features.