Answers
The freezing point in °C) of a1.56 m aqueous solution of CaCl2 is -8.705 °C.
This is a water solution so, you will need to know the freezing and boiling point of water.
Freezing point of water in Kf (°C/m) = 1.86 °C/m
Boiling point of water in Kb (°C/m) = 0.512 °C/m
There are 3 number of particles in CaCl2
Multiple the number of particles and the 1.56 m to the freezing and boiling point of water.
(Freezing Point) Kfm (1.86)*(1.56)*(3) = 8.7048
(Boiling Point) Kbm (0.512)*(1.56)*(3) = 2.39616
Subtract the Freezing point of water in °C (Celsius) which is 0.0 °C from the answer 8.7048 ( 0 - 8.7048 = -8.7048 °C
Add the Boiling point of water in °C (Celsius) which is 100.0 °C from the answer 2.39616 ( 100 + 2.39616 = 102.39616)
The question is asking for the Freezing point of 1.56 m which is what we now know to be -8.7048 °C
The answer in 3 decimal points will round up to -8.705 °C
The reason is because 0 does not count as a significant figure so you need the “5” to make this answer have 3 significant figures which are the numbers 8, 7 and 5 which makes it round up to the 3 decimal points.
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Related Questions
NAME
PROTOTYPE
REPORT
BATTLE ARMOR UPGRADES
WELCOME BACK SCI-OPERATIVE! Nikole and Aki have made big gains battling THE HIVE thanks to
their enhanced Battle Armor. Mr. Pauling has been working hard in the lab to create a new
be serving as Mr. Pauling's lab assistant, helping him to complete his report that analyzes the
prototype of the Battle Armor to help withstand THE HIVE laserbeam blasts, In this activity, you will
effectiveness of the metals used in the Battle Armor. As you go through his report, look for
messages from Mr. Pauling regarding the unfinished parts.
1. INTRODUCTION
The current Battle Armor uses Silver to protect
Aki and Nikole. Silver has a melting point of 962
degrees Celsclus as shown in the heating curve
to the right. A HEATING CURVE is a graph that
shows how temperature changes over time in a
sample as heat energy is added. Heating curves
can be used to analyze phase changes.
Describe what
you observe
about the silver
heating curve.
Mr. Pauling
THERMODYNAMICS is the study of heat energy and its transformations. Thermodynamics impacts
systems like Akl and Nikole's Battle Armor. Different materials absorb energy at different rates,
with some materials heating up much faster than others. All materials have a maximum amount of
and Nikole do not want their Battle Armor melting while battling THE HIVEI By creating a Battle
energy that they can absorb before reaching a temperature at which they will begin to melt. Aki
Armor that can absorb more heat energy without melting, Mr. Pauling can help the team withstand
higher energy blasts from THE HIVE'S laser beam blasts.
HEATING CURVE FOR SILVER (Ag)
NOTES:
hut
LIT C
Ag
20
Solid
Two key data points shown on a heating curve are the MELTING and BOILING POINTS of a sub-
stance. This data, along with temperature and heat energy measurements, helps determine the
conditions needed for a substance to undergo a phase change. Refer to your Phase Change Field
Guide if you need a refresher on phase changes.
Answers
It is likened to a fictional scenario in which a team of scientists and "sci-operatives" are working on upgrading their Battle Armor to withstand the attacks from a fictional entity called "THE HIVE."
The team is using thermodynamics, the study of heat energy and its transformations, to analyze the effectiveness of the materials used in the Battle Armor, including silver.
What informs the scenario?In this scenario, Mr. Pauling is creating a report that analyzes the heating curve for silver, which is used in the Battle Armor. The heating curve shows the changes in temperature over time as heat energy is added, and it helps to determine the melting and boiling points of the substance, as well as the conditions needed for a phase change.
It seems like the purpose of the activity is to understand the use of thermodynamics in analyzing the effectiveness of materials in the Battle Armor, and to look for messages from Mr. Pauling regarding any unfinished parts of the report.
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What does it mean for a gene to be active?
Answers
Answer: You should be able to find the answer on the internet
How do I go about solving a Nuclear Equation?
Answers
Answer:
How do amoeba respire.
How do plants respire.
During electrolysis, where do reduction reactions occur?
Answers
Answer:
at the negative cathode
Explanation:
Reduction happens at the negative cathode because this is where positive ions gain electrons. Oxidation happens at the positive anode because this is where negative ions lose electrons.
Answer:
B. in the cathode of an electrolytic cell
Explanation:
Calculate the relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O (Cu = 64 S = 32 H = 1 0 = 16).
Answers
The relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O is 249.
What is molecular mass?Molecular mass is a measure of the total mass of one mole of a substance, which is defined as the mass of the substance divided by the number of molecules it contains. It is typically expressed in g/mol and is also known as molar mass. Molecular mass is determined by the types and number of atoms that compose a molecule, and is an important factor in understanding the properties of a substance.
This is calculated by adding the atomic masses of all the atoms present in the compound.
The atomic mass of copper is 64, sulphur is 32, oxygen is 16, and hydrogen is 1.
So, the relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O is 64 + 32 + (16*4.5) + (1*5) = 249.
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Chlorine reacts with sodium and with hydrogen.
Compare the structure and bonding in sodium chloride and hydrogen chloride.
Answers
Answer:
Sodium Chloride has Ionic bond while Hydrogen Chloride has covalent bond.
Explanation:
Na has 11 electrons (2, 8, 1) and need to give away 1 electron to be stable
Cl has 17 electrons ( 2, 8, 7) and needs 1 electron to be stable.
Na transfers 1 electron to CL to form Ionic bond.
While
Hydrogen has 1 electron and shares with Chlorine to be stable.
Covalent bond involves sharing.
Chlorine reacts with sodium to form ionic sodium chloride while chlorine reacts with hydrogen to form covalent hydrogen chloride.
The nature of bonding between atoms depends on their relative difference in electronegativity.
Chemical bonding is the process by which atoms come together to form compounds.
There are different kinds of chemical bonds;
Ionic or electrovalent bondCovalent bondMetallic bondAn ionic bond is formed when there is high electronegativity difference between the bonding atoms. Typically, this type of bond is formed when the electronegativity difference is about 2.0 and above.
For a covalent bond, an electronegativity difference of about 0.4 - 1.7 is considered a polar covalent bond. Lower values of electronegativity difference corresponds to a nonpolar bond.
The electronegativity difference between sodium and chlorine is about 2.23. This corresponds to a pure ionic bond. The compound is composed of chlorine and sodium ion pairs alternately located in a crystal lattice as shown in the image attached.
The electronegativity difference between chlorine and hydrogen is about 0.96. This corresponds to a polar covalent bond. The negative end of the dipole points towards chlorine while the positive end of the dipole points towards hydrogen.
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What is the percent composition of Iron (II) Phosphate
Answers
Answer:
The percent composition of Iron (II) Phosphate is
Fe = 46.866%
P = 17.330%
O = 35.806%
The percent composition of compounds is obtained form the mass of atoms in the compounds.
The formula of Iron (II) Phosphate is Fe3(PO4)2. We now have to obtain the molar mass of the compound as follows;
Molar mass = 3(56) + 2[31 + 4(16)] = 168 + 190 = 358 g/mol
Percentage of iron = 3(56)/358 × 100/1 = 46.9%
Percentage of phosphorus = 2(3)1/358 × 100/1 = 17.3%
Percentage of oxygen = 8(16)/358 × 100/1 = 35.8 %
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pLeeease help im so tired and i need to SLEEP. Answer the 1s you know
1. How does the mechanical energy of a ball that is starting to fall compare to its total energy just before it hits the floor?
2. When you stand in sunlight, what form of energy is emitted by the sun?
3. An eye doctor wants to design reading glasses that also function as sunglasses. Should the eye doctor use a reflective-transparent material or a reflective-opaque material for the lenses? Support your claim.
Answers
2. heat energy
3. reflective-transparent would be best, as they can reflect some light while let other light through, reflective-opaque would be useless in any circumstances because no light at all would be able to get through
2. Which state of matter is characterized by particles that are close to each other but are not arranged in a definite pattern?
A)liquid
B)plasma
C)solid
D)gas
Answers
Answer:
Solid
Explanation:
Cus its solid, take a brick for example. It's hard and has no space unlike liquid or gas.
How many moles are in 2.3 x10^25 atoms of phosphorus
Answers
Answer:
38.21 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
\(n = \frac{N}{L} \\\)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
\(n = \frac{2.3 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 38.20598...\)
We have the final answer as
38.21 molesHope this helps you
An unknown solid object with a mass of 35.0 g was heated to 100.0 °C and transferred to a calorimeter containing 50.0 g of water at 23.0 °C. After thermal equilibrium was reached, the temperature inside the calorimeter was 26.5 °C. Calculate the specific heat of the unknown solid (specific heat of water = 4.184 J/g°C).
Answers
Taking into account the definition of calorimetry, the specific heat of the unknown solid is 0.285 \(\frac{J}{gC}\).
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass mc is the specific heat of the substance c ΔT=Final temperature - Initial temperature is the temperature variation.Specific heat of the unknown solid
In this case, you know:
For the unknown solid:Mass of solid = 35 gInitial temperature of solid= 100 °CFinal temperature of solid= 26.5 ºCSpecific heat of solid= unknownFor water:Mass of water = 50 gInitial temperature of water= 23 ºCFinal temperature of water= 26.5 ºCSpecific heat of water = 4.186 \(\frac{J}{gC}\)Replacing in the expression to calculate heat exchanges:
For unknown solid: Qsolid= csolid × 35 g× (26.5 - 100)°C
For water: Qwater= 4.186 \(\frac{J}{gC}\)× 50 g× (26.5 - 23)°C
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the solid gives up will be equal to the heat that the water receives. Therefore:
- Qsolid = + Qwater
Replacing the corresponding expressions:
- csolid × 35 g× (26.5 - 100)°C= 4.186 \(\frac{J}{gC}\)× 50 g× (26.5 - 23)°C
Solving:
csolid × 2,572.5 g×°C= 732.55 J
csolid =732.55 J÷ 2,572.5 g×°C
csolid=0.285 \(\frac{J}{gC}\)
Finally, the specific heat of the unknown solid is 0.285 \(\frac{J}{gC}\).
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Food and drink should be consumed when doing experiments in the lab or at home.
O True
O False
Answers
Answer: False
Explanation:
Eating or drinking in the lab can, first and foremost, increase your risk of exposure to hazardous materials. Food or drink can leave a mess increasing the risks for contamination of your experiments and potentially attracting pests.
What is the difference between a proton, neutron, and electron?
Answers
Answer:
proton :
a particale or atom containing a postive charge
nuutron
a particale or atom that contains a negative charge
electron :
a particale or atom with a negative chrage.
Explanation:
proton:
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
nuetron:
a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
elcetron:
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
What type of molecule is acetylacetone?
Answers
Answer:
here is the answer
Explanation:
ketone is the answer
Analyze and Critique:
A student submitted the written statement below describing the following equation:
Provided equation: Zn (s) + Cl2 (g) ----> ZnCl2 (s)
Student's Response:
A solid zinc element and one gaseous chlorine molecule combined to make one unit of solid zinc chloride
The student made 2 mistakes. List each mistake and how they can fix it.
Answers
Answer:
The two mistakes made by the student are: 1) they used the term "element" instead of the term "substance"; and 2) they stated that one gaseous chlorine molecule was combined with the zinc, when actually two molecules of chlorine gas were combined with the zinc. The student can fix these mistakes by using the term "substance" instead of "element" and by stating that two molecules of chlorine gas were used in combination with the zinc.
I need some help on this question please!
A chemist has 3.45 x 1022 molecules of P2O5. How many grams of P2O5 does the chemist have?
Thanks to anyone who helps!
Answers
To convert the number of molecules of P₂O₅ to grams, we need to use the Avogadro's number and the molar mass of P₂O₅ .
How many grams of P₂O₅ does the chemist have according to the question?The molar mass of P₂O₅ can be calculated as follows:
2 × molar mass of P + 5 × molar mass of O
= 2 × 30.97 g/mol + 5 × 15.99 g/mol
= 61.94 g/mol + 79.95 g/mol
= 141.89 g/mol
Therefore, the molar mass of P₂O₅ is 141.89 g/mol.
Now, we can use Avogadro's number to convert the number of molecules to moles:
3.45 × 10²² molecules / 6.022 × 10²³ molecules/mol
= 0.0573 moles
Finally, we can use the molar mass of P₂O₅ to convert moles to grams:
0.0573 moles × 141.89 g/mol = 8.14 grams
Therefore, the chemist has 8.14 grams of P₂O₅ .
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The main assumptions of the Kinetic Molecular Theory of gases are:
1. Gases are made up of molecules which are relatively far apart.
2. The molecules are in motion at high speeds.
3. The molecules are perfectly elastic.
4. Increase in temperature increases the kinetic energy of the molecules.
The assumption that accounts for the great compressibility of gases compared to liquids and solids is:
1
2
3
4
none
Answers
The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)
The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.
In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.
In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.
Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.
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The diagram shows the setup of an experiment. A few observations of the experiment are listed in table below the diagram.
Experimental Observations
Description
1. Color of solution turned blue
2. Shiny hair like crystals deposited on the copper strip
Which of the following is the correct explanation for one of the given observations?
Observation 1 is a result of silver ions moving into the solution.
Observation 2 is a result of nitrate ions moving into the solution.
Observation 1 is a result of silver ions changing their oxidation state.
Observation 2 is a result of silver ions changing their oxidation state.
Answers
The proper explanations to the observation are;
Observation 1 is a result of silver ions changing their oxidation state.Observation 2 is a result of silver ions changing their oxidation state.What is a redox reaction?A redox reaction is one in which a specie is oxidized while the other specie is reduced. In the first observation, the color of the solution turned blue and in the second observation, shiny hair like crystals deposited on the copper strip.
Hence;
Observation 1 is a result of silver ions changing their oxidation state.Observation 2 is a result of silver ions changing their oxidation state.Learn more about redox reaction:https://brainly.com/question/13293425
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B. Complete the chart about the characteristics of each kind of vertebrates
Animals
Breathing Movement Food Getting
Body
Covering
Mode
Reproductie
1.carabao
2.frog
3.snake
4. pigeon
5.milk fish
pless hello me to the my question please help
Answers
How many moles of MgCl2 are present in 60.0 mL of 0.100 M MgCl2 solution
Answers
Taking into account the definition of molarity, the number of moles of MgCl₂ present in 60.0 mL of 0.100 M MgCl₂ solution is 0.006 moles.
Definition of molarityMolarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by:
molarity= number of moles of solute÷ volume
Molarity is expressed in units moles/L.
Number of moles of MgCl₂In this case, you have:
Molarity= 0.100 Mnumber of moles of MgCl₂= ?volume= 60 mL= 0.06 L (being 1000 mL= 2 L)Replacing in the definition of molarity:
0.100 M=number of moles of MgCl₂÷ 0.06 L
Solving:
0.100 M × 0.06 L= number of moles of MgCl₂
0.006 moles= number of moles of MgCl₂
Finally, the number of moles of MgCl₂ is 0.006 moles.
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4.What volume of hydrogen gas at STP is produced when 2.5 grams of zinc react with an
excess of hydrochloric acid?
Answers
Answer:
0.86
Explanation:
1mol of Zn has mass of 65.39g.The amount of Zn is 2.5g65.39g/mol=0.038mol.
The amount of H2 produced is the same as the amount of Zn consumed (0.038mol).
1mol of ideal gas will occupy 22.4L at STP.
The H2 will occupy 0.038mol×22.4L/mol=0.86L
.
why does liquid water have a higher specific heat than ice or water vapor
Answers
Explanation:
As a liquid, water has more directions to move and to absorb the heat applied to it. There is more surface area that needs to be heated for the overall temperature to increase. However, with ice, the surface area doesn't change due to its more rigid structure
What is the mollusk tongue called?
B
Answers
Answer:
why
Explanation:
B is the answer to the question
The electron configuration of an element is 1s^2 2s^2 2p^6. Describe what most likely happens when an atom of this element comes near an atom having seven valance electrons. (5 points)
Answers
Answer:
In some cases, they could bond to form covalent compounds. However, in most instances they will not interact.
Explanation:
Remember that elements desire to have a full octet (8 valence electrons). The configuration given represents an element with 8 valence electrons. I know this because the outermost shell (denoted by the 2 coefficient) has 8 electrons (2s²2p⁶ = 2 + 6 = 8). Therefore, this element is stable.
The other atom has 7 valence electrons. Since it is 1 electron away from having a full octet, it really wants 1 more electron. The original element is unlikely to give up an electron because that would prevent it from having a full octet. As such, when the atoms are close to one another, they will most likely not interact. The element with the full octet is most likely a noble gas, and these elements rarely form bonds. Noble gases can form bonds with halogens (elements with 7 valence electrons) but only if there are excess halogens and particular noble gases in the system.
The electron configuration of an element is 1s2 2s2 2p6 is Neon with atomic number 10. They either will form covalent bond with other element of does not from bond with any other element.
What is chemical bond?Chemical bond is defined as any of the interactions that allow for the grouping of atoms into molecules, ions, crystals, and other stable species that make up ordinary substances.
It can also be defined as a connection between atoms in molecules or compounds, as well as between ions and molecules in crystals.
There are basically four types of chemical bond.
Covalent bondIonic bondMetallic bondMolecular bondThus, the electron configuration of an element is 1s2 2s2 2p6 is Neon with atomic number 10. They either will form covalent bond with other element of does not from bond with any other element.
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how many bond can boron make without hybridization
Answers
Without hybridization, boron can form 4 bonds
What is hybridization?Hybridisation is phenomenon of combining two atomic orbitals to give a new degenerate hybrid orbital which have same energy levels. Hybridization increases the stability of bond formation than unhybridized orbitals. We can predict the shape of molecules by its hybridization.
With hybridization , boron can form 3 bonds.
Hence, without hybridization, Boron donates the lone pair of electrons to form the fourth bond. In addition to that Boron is a second period element hence, which makes it small in size and d-orbitals are unavailable as well. Hence, Boron can only form 4 bonds with hybridization.
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Determine the overall charge on particles with the subatomic makeups given.
13 protons, 14 neutrons, and 10 electrons
+3
Answers
Answer:
The correct solution will be "+3".
Explanation:
The given values are:
Number of protons
= 13
Number of neutrons
= 14
Number of electrons
= 10
As we know,
⇒ \(Charge = Number \ of \ protons - Number \ of \ electrons\)
On putting the estimated values, we get
⇒ \(=13 - 10\)
⇒ \(=+3\)
The overall charge on the particle would be +3
Atomic ChargeThe atomic charge on a particle is determined by the number of protons (positive charge) and electrons (negative charge) in the atoms of the particle.
Neutral atoms have equal number of protons and neutronsNegatively charged atoms have more electrons than protonsPositively charged atoms have more protons than electronsThus, an atom with 13 protons and 10 electrons will have a residual proton of 3, making the overall charge to be +3.
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What is photosynthesis? Answer in 2-4 sentences, including the words below:
Chemical Reaction
Energy
Answers
Photosynthesis is a chemical reaction in which energy from sunlight is used to convert carbon dioxide and water into glucose and oxygen. This process occurs in the chloroplasts of plant cells and is essential for the survival of plants, as well as for many other organisms that depend on plants for food.
Which two tools could be used to measure the volume of this eraser?
A. Triple-beam balance
B. Graduated cylinder
C. Tape measure
D. Digital thermometer
Answers
Answer:
Graduated cylinder
Explanation:
A graduated cylinder is essentially meant for volume measurement. It is a cylinder that is graduated from zero to a certain number.
The graduated cylinder is gradually filled with water, the volume of water in the cylinder can be known by reading off the graduation on the cylinder, hence the answer above.
is na2o a element or compound
Answers
Answer:
Its a compound :PP
Explanation:
have a good day
Answer:
Compound
Explanation:
A 465 mL sample of gas at 55°C is cooled to standard temperature (0°C). What is its new volume?
Will mark brainliest INSTA
Answers
Explanation:
charles law
V1/T1=V2/T2
465/(273+55) =V2/273
V2=387mL