Answer:
Glycerine, water and methylated spirits have hydrogen bonds between the molecules. However, in water and Glycerine these intermolecular forces are very strong while in the methylated spirits they are slightly weaker. This leads to the higher boiling point for water and Glycerine.
Explanation:
In chemistry a molecular formula indicates every single atom and its numbers in a chemical compound. Hence the molecular formula C3H8O3 simply says that there are three carbon (C) atoms, eight hydrogen (H) atoms and three oxygen (O) atoms in this compound.
Use the equation to answer the prompt. A student claims that the equation models beta-minus decay because the atomic number of the nucleus decreases by one. In one or two sentences, explain the error in the student's reasoning.
The error in the student's reasoning happened as they get confused between the beta minus decay and beta plus decay.
What is beta minus decay?A neutron is converted into a proton in beta minus, increasing the atomic number of the atom.
The proton is positive, while the neutron is neutral. The nucleus also produces an electron and an antineutrino in order to ensure charge conservation.In the given question beta minus decay is not occur as atomic number of the daughter nuclei does not increases. Rather than this in the given decay atomic mass of the daughter nuclei is less than the parent nuclei means plus beta decay is happened there.
Hence the error is in predicting the correct particle with charge.
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3. Convert these volumes to liters:
a. 320 mL
b. 948 mL
c. 1834 mL
d. 3267 mL
4. Convert these volumes to milliliters:
a. 0.75 L
b. 0.28 L
c. 1.32 L
d. 2.4 L
(pls help!) What mass of oxygen atoms is required to react completely with 30 u of hydrogen atoms?
One mole Hydrogen need 1/2mol O_2 .
Moles of Hydrogen
30u/1u30molMoles of O_2
30/215mol[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's get to the reaction first ~
[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]
Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.
So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.
Number of Hydrogen gas molecules is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{30}{2} [/tex]
[tex]\qquad \sf \dashrightarrow \: 15[/tex]
Number of Oxygen gas molecules needed is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} [/tex]
Number of Oxygen atoms needed :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]
[tex]\qquad \sf \dashrightarrow \: {15} \: atoms[/tex]
One atom of Oxygen weight 16 u, so 15 atoms weight ~
[tex]\qquad \sf \dashrightarrow \: {15} \times 16[/tex]
[tex]\qquad \sf \dashrightarrow \: 240 \: u[/tex]
So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.
If 100.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting reactant? Show your work.
A drinking glass and a tightly sealed jar sit on the kitchen counter. both are half-filled with water and are undisturbed for several hours. will the liquid and water vapor establish equilibrium in either container? explain your answer
A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
Will the liquid and water vapor establish equilibrium in either container?The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.
So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
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which ph value is consistent with the indicator results
The color of the indicator will correspond to the pH values of either acidic or basic substances.
What are pH values and Indications?pH values are values which are obtained from taking the negative logarithm to base ten of the hydrogen ions concentration of a substance.
pH values of acidic substances are less than 7 while the pH of basic or alkaline substances are greater than 7.
An indicator is an organic dye which changes colour according to the pH of a substance.
Examples of indicators are methyl orange and phenolphthalein.
Therefore, the color of the indicator will correspond to pglh values of either acidic or basic substances.
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Describe polar and nonpolar molecules
Answer:
Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.
Explanation:
hope it's helps
What kinds of solute particles are present in water solutions of electrolytes and no electrolytes?
Ion particles are present in water solutions of electrolytes while neutral molecules are present in case of non electrolytes.
What are electrolytes?Electrolytes are compounds that dissociate into ions when dissolved in a solution, resulting in the solution becoming conductive to electricity. These substances are usually made up of ionic compounds or acids that dissolve in water, producing positively and negatively charged ions. These ions can move freely within the solution and transport electric charge, thereby transforming the solution into a conductor of electricity.
What type of solute particles exist in water solutions of electrolytes?When we talk about water solutions of electrolytes, it's important to note that the solute particles are present in the form of ions. These ions are essentially atoms or molecules that have a net electric charge as a result of gaining or losing electrons. The presence of these charged particles allows for conductivity within the solution, making them capable of carrying an electric charge. Some common examples of electrolytes include table salt (also known as sodium chloride), acids, and bases.
What type of solute particles exists in water solutions of non electrolytes?When it comes to solutions in water that contain non-electrolytes, the solute particles are made up of neutral molecules or compounds that lack an overall electric charge and therefore, cannot facilitate electrical conductivity within the solution. Sugar, alcohol, and urea are a few examples of non-electrolytes.
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please help
Tare the balance. Place the wooden block on
the pan, and record the block's mass below. g
Answer:
the first question's answer is 10.7g and the follow up question is 47.7g.
Explanation:
it makes you drag the object onto the scale and then displays it on the green rectangle.
what is 750 grams of phosphorus
Answer:
750 g of phosphorus is 750 g of phosphorus
ii. If the pressure after landing was 1.0 atm, what was the volume of the passenger's collapsed water bottle? (Assume the bottle collapsed easily and temperature didn't change.) (6 points)
Using the ideal gas equation and Gay Lussac's law, the volume of the passenger's collapsed bottle after landing is 0.0075 L.
What is ideal gas equation?The ideal gas equation shows the relationship between temperature, pressure, volume and number of moles.
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Given that;
PV = nRT
P = gas pressureV = volume of gasn = number of moles of gasR = molar gas constantT = temperaturen = PV/RT
Hence:
P = 0.75 atm;
V = 0.5 L;
T = 295 K;
R = 0.082 atmL/K.mol
n = 0.75 * 0.5 / 0.082 * 295
n = 0.015 moles
If the pressure after landing was 1.0 atm;
V1n1 = V2n2
V2= V1n1/n2
V2 = 0.5 L * 0.015 moles/ 1 mole
V2 = 0.0075 L
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Missing parts;
A passenger on an airplane finished a 0.5 L bottle of water during the flight
and replaced the lid. The cabin pressure and temperature were maintained at
0.75 atm and 295 K during the flight. After landing, he noticed his empty water
bottle had collapsed. (12 points)
i. How many moles of gas were in the water bottle?
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David runs a 100-m dash while pushing a stroller with a force of 25N. What amount of work does David do on the stroller?
David runs a 100-m dash while pushing a stroller with a force of 25N. The work done by David is 2500 Nm.
What is force?Force is a power that changes the motion of the object.
The displacement is 100 m
The force is 25 N
Work done = force x displacement
25 x 100 = 2500 Nm
Thus, the work done by David is 2500 Nm.
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how do you complete chemical equations?
Ca+O2 →
[tex]2\text{Ca} + \text{O}_2 \rightarrow 2\text{CaO}[/tex]
(Use P_T for total pressure; P_water vapor for water vapor pressure; P_hydrogen gas for hydrogen gas pressure)
From the Dalton's law of partial pressures, the pressure of the hydrogen gas is 91.83 kPa.
What is partial pressure?In a mixture of gases, the total pressure is the sum of the pressures of the individual gases in the mixture according to the Dalton's law of partial pressures.
In this case, the partial pressure of the hydrogen gas is Phydrogen, the partial pressure of water is Pwater and the total pressure is PT.
Hence;
Phydrogen = PT - Pwater
95 - 3.17 = 91.83 kPa
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In the space below draw a model of the atoms that make up a water molecule to show the charges of each of these atoms chemistry
Answer:
I didn't draw this but I think they're asking you to draw this
Explanation:
What is the IUPAC name
HCl(acid)+C₄H₈ (butene)⇒ addition reaction
name of the product: 2-cloro butane
Which organisms are producers?
Choose all correct answers.
tree
grass
monkey
mold
Answer: Tree and Grass are the two correct answers here
Explanation: Producers are photosynthesizing organisms. They are any kind of green plant that make their food by taking sunlight and using the energy to make sugar.
Answer:
Tree, grass
Explanation:
Producers make their own food. Trees and grass can make their own food using sunlight (photosynthesis). Monkey is consumer (eats other things like bananas- made by plants - for survival). Mold (like fungus) eat dead stuff and thus are decomposers (not producers).
According to Newton's second law of motion, a larger force acting on an object causes a greater(..................................) of that object
Answer:
acceleration
learnt this in 8th grade
acceleration
Newton's second law : F = m.a
F proportional to m and a
F > than a >
what happens when you mix hydrogine, potassium and sodium
Answer:
-
Explanation:
As the piece of metal skitters across the surface of the water in a beaker and — particularly in the case of potassium — it appears to catch fire, it is not obvious that the explanation for both phenomena lies in the production of hydrogen gas.
formation of water: 2H2 + 1 O2 --> 2H2O
How many moles of H2O can be produced from 35 grams of O2?
Answer:
2.2 moles H2O
Explanation:
[tex]35g O_2 \mbox{ \cdot }\frac{1mol}{32g/mol} \mbox{ \cdot }\frac{2mol H_2O}{1mol O_2}= 2.1875[/tex], which rounds to about 2.2
Body systems often interact with each other. The image below shows parts of body systems that interact to fulfill a function for the body.
Which statement describes how the body systems in the image work together to perform a common function
According to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.
What are the body systems?They are the different sets of organs that make up the body, collaborating in each case with the fulfillment of some specific type of functions.
This simultaneous and juxtaposed set of systems involves various organs, ducts, tissues and various glands, all coordinated by endocrine substances and nerve impulses, so as to operate more or less autonomously as the case may be.
Therefore, we can conclude that according to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.
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What is the pH of a solution if the pOH is 7.09?
Answer:
pH = 6.91
Explanation:
Recall that at 25 °C, we have the relationship:
[tex]\displaystyle \text{pH} + \text{pOH} = 14.00[/tex]
Therefore, the pH of a solution with a pOH of 7.09 is:
[tex]\displaystyle \begin{aligned} \text{pH} + (7.09) & = 14.00 \\ \\ \text{pH} & = 6.91 \end{aligned}[/tex]
7
10 points
how many moles of nitrogen gas will occupy a volume of 0.347 l at 7.0 atm and 300 k?
"do not include a unit with your answer, just type in the number!
type your answer..
previous
Answer:
.0987 moles
Explanation:
Ideal gas law PV = n RT R = .082057 L-atm/mol-K
7 ( .347) = n (.082057) (300) n = .0987 moles
the weather patterns seen on earth are influence greatly by
Answer: The butterfly effect
Explanation:
Explain how each property affects the energy in a wave:
Amplitude:
Wave speed:
Wavelength:
Frequency:
Answer:
frequency
Explanation:
because a wave is equally a frequency
A reaction between an alcohol and an organic acid is classified as.
Answer:
esterification reaction ...........
Suppose much of an old forest will be used for farmland. A certain portion of the land will be set aside as wildlife habitat. You are asked to chose between the two plans outlined in A and B. The green areas represent the proposed reserve areas. Which plan will you recommend? Explain your reasoning.
Answer:
A certain portion of the land will be set aside as wildlife habitat
Select the correct answer. which element can bond with titanium (ti) to form a polar covalent bond? a. beryllium (be) b. fluorine (f) c. manganese (mn) d. nitrogen (n) e. oxygen (o)
The element that can bond with titanium (Ti) to form a polar covalent bond is Nitrogen (N).
What is a Covalent Bond?In this type of bond, the atoms of the element share only one electron. As an example, we can mention the chlorine gas Cl2, in which the two chlorine atoms share an electron to achieve chemical stability.
Hence, we can see that to bond with Titanium, there needs to be an element that would form a polar covalent bond and this is Nitrogen and this is because of their electronegativity difference.
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30. Which of the following substances would depress the freezing point of pure water the most?
a.
NaCl
c.
C6H12O6
b. MgCl₂
d.
K3PO4
Answer:
D. K3PO4
Explanation:
K3PO4 would dissolve into 3 potassium ions and one phosphate ions thus total of 4 items added in water. Freezing point is depressed by high amounts of stuff. NaCl would add 2 items (one Na and one Cl). Glucose would not break apart, thus 1 item. MgCl2 would break into One Mg and two Cl ions (thus 3 things.)..
Overall, K3PO4 dissolves into most components, thus would depress the freezin point most.
Balance the following reactions:'
Mg(OH)2 + HCl ➡️ H2O + MgCl2
Ca(ClO3)2 ➡️ CaCl2 + O2
Ca(NO3)2 + ➡️ KBr CaBr2 + KNO3
Al + HCl ➡️ AlCl3 + H2
C2H6 + O2 ➡️ CO2 + H2O
[tex]2 HCl + Mg(OH)_2[/tex] → [tex]2 H_2O + MgCl_2[/tex]
[tex]3 Ca(ClO)_2[/tex] → [tex]2 CaCl_2[/tex] + [tex]Ca(ClO_3)_2[/tex]
[tex]2 KBr + Ca(NO_3)_2[/tex] →[tex]2 KNO_3 + CaBr_2[/tex]
[tex]2Al +6HCl[/tex] → [tex]2AlCl_3 +3H_2[/tex]
[tex]2C_2H_6+7O_2[/tex] → [tex]4CO_2+6H_2O.[/tex]
What is a balanced chemical equation?A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.
Balanced chemical equation:
[tex]2 HCl + Mg(OH)_2[/tex] → [tex]2 H_2O + MgCl_2[/tex]
[tex]3 Ca(ClO)_2[/tex] → [tex]2 CaCl_2[/tex] + [tex]Ca(ClO_3)_2[/tex]
[tex]2 KBr + Ca(NO_3)_2[/tex] →[tex]2 KNO_3 + CaBr_2[/tex]
[tex]2Al +6HCl[/tex] → [tex]2AlCl_3 +3H_2[/tex]
[tex]2C_2H_6+7O_2[/tex] → [tex]4CO_2+6H_2O.[/tex]
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