how many grams of CaCl2 are required to make 25mL of 1.5
Answer:
Mass of CaCl2 = 4.1625 grams
Explanation:
We will recall that:
For solution: Molarity = [tex]\dfrac{moles \ of \ solute }{volume \ of \ solution (L)}[/tex]
[tex]1.5 = \dfrac{moles}{0.025 }[/tex]
Moles = 0.0375 moles
Mass = no of moles × molar mass(MM)
Molar mass of CaCl2 = 111 g/mol
Mass = 0.0375 mol × 111 g/mol
Mass of CaCl2 = 4.1625 grams
Which is true?
Capacity is the amount of liquid a container can hold. Volume is how much space an object takes up.
Volume is the amount of liquid a container can hold. Capacity is how much space an object takes up.
Capacity is the amount of solid a container can hold. Volume is how much space an object takes up.
Capacity is the amount of liquid a container can hold. Mass is how much space an object takes up.
Answer:
Capacity is the amount of liquid a container can hold. Mass is how much space an object takes up.
Explanation:
All the others are incorrect.
Map of structure of an Atom?
Atoms are made up of a very tiny, positively charged nucleus that is encircled by a sea of negatively charged electrons. Despite often being less than a tenth of an atom's size, the nucleus makes up more than 99.9% of the atom's mass.
What is the structure of an Atom?The term "atomic structure" describes the structure of an atom, which has a nucleus (centre) that contains both protons (positively charged) and neutrons (neutral). The centre of the nucleus is circled by the negatively charged electrons.
Positively charged protons, negatively charged electrons, and neutral neutrons make up the three types of subatomic particles that make up an atom. Nearly equal in mass, protons and neutrons are found in the dense nucleus of the atom.
Thus, Atoms are made up of a very tiny, positively charged nucleus that is encircled by a sea of negatively charged electrons.
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Conduct research to identify two naturally occurring radioactive elements and two synthetic radioactive elements.
Natural radioactive elements are those that spontaneously radiate in nature and have an atomic number between 82 and 92. In dirt, air, water, rocks, plants, food, uranium—a radioactive element—can be discovered.
What makes certain substances radioactive?When an element's atoms contain excess neutrons or protons, the extra energy produced in the nucleus causes the atom to lose its equilibrium or become unstable. if and how radioactive particles can become stable. Radiation is produced by radioactive atoms' unstable nuclei.
What radiation is the most dangerous?Compared to beta and gamma particles, alpha particles represent the most dangerous internal threat. The most hazardous methods of exposure to radioactive elements that release alpha and beta radiation are ingestion, inhalation, absorption, and injection. Gamma radiation is the outside hazard that causes the most damage.
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why the enthalpy of Ba(oh)2 +h2so4 is greater than Ba(oh)2 + hcl?
Answer:
Explanation:
To break apart a molecule of H2So4 is much higher than HCl although HCl is an ionic bond it is only bonded to one hydrogen. While H2So4 is bonded to two of them, aswell as its structure being much more complex. The energy to break Ba(h)2 is equal in both.
Differences between allotropy and isotopy
Answer:
Property of an element by virtue of which it exists in two or more forms which differ only in their physical properties is known as allotropy. Allotropes are the different physical forms in which the element can exist. Allotropes are different physical forms of the same element.
Also-
Allotropes are different forms of the same element in the molecular level. Isotopes are different forms of atoms of the same chemical element. The key difference between allotropes and isotopes is that allotropes are considered at the molecular level, whereas isotopes are considered at the atomic leve
Explanation:
~Hope this helps~
The graph below shows the average number of sunspots seen between 1610 and 2009.
Based on the graph, which of these conclusions is most likely correct?
The global climate was colder than normal from 1650 to 1700.
The global climate was colder than normal from 1950 to 2000.
The global climate was hotter than normal from 1630 to 1650.
The global climate was hotter than normal from 1900 to 1930.
The global climate was colder than normal from 1650 to 1700. This conclusion is most likely correct. Therefore, option A is correct.
What is global climate ?Global climate refers to how heat and precipitation are distributed over a lengthy period of time on Earth's surface. The average temperature of the planet is kept at roughly 60°F (16°C) by heat from the sun, which is within the range required for biological life and the preservation of the planet's liquid water reserves.
Global climate change is the collective term for all the Earth's average long-term changes. Along with changing precipitation patterns and higher temperatures, these also include the consequences of global warming, such as: rising sea levels alpine glaciers are thinning.
Thus, option A is correct.
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Your question is incomplete probably your question was
The graph below shows the averaged sunspots from 1610 to 2007. The graph shows sunspot number on the y axis and years 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, and 2000 on the x axis. The graph rises and falls in a cyclic order in gaps of approximately 10 years. The number of sunspots observed in 1610 was 40, in 1650 it was 5, in 1700 it was 10, in 1750 it was 90 and the number of sunspots in 1800 was 50. The number of sunspots observed in 1850 was 130 and the number of sunspots in 1900 was 10. The number of sunspots observed in 1950 was 150 and the number of sunspots observed in 2000 was 30. Based on the graph, which of these conclusions is correct? Some of the previously warm regions became colder from 1650 to 1700. Some of the previously cold regions became warmer from 1600 to 1700. Some of the previously warm regions became warmer from 1610 to 1700. Some of the previously cold regions became colder from 1900 to 1950.
A 1.00 L volume of HCl reacted completely with 2.00 L of 1.50 M Ca(OH)2 according to the balanced chemical equation below. 2HCl + Ca(OH)2 Right arrow. CaCl2 + 2H2O What was the molarity of the HCl solution? 0.375 M 1.50 M 3.00 M 6.00 M
Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. Therefore, the molarity of the HCl solution is 3M. the correct option is option C.
What is molarity?
Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.
Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution
Mathematically,
2HCl + Ca(OH)[tex]_2[/tex] [tex]\rightarrow[/tex] CaCl[tex]_2[/tex] + 2H[tex]_2[/tex]O
Molarity of HCL× Volume of HCL=Molarity of Ca(OH)[tex]_2[/tex] ×Volume of Ca(OH)[tex]_2[/tex]
Molarity of HCL× 1.00 L=1.50 M× 2.00 L
Molarity =3M
Therefore, the molarity of the HCl solution is 3M. the correct option is option C.
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On a cold day you may make a cup of hot chocolate. What is the solute in hot chocolate? A. Cocoa powder B. Heat C. Steam D. Mug
Answer:
A
Explanation:
Solute is what is being dissolved.
Solute is cocoa powder when we make a cup of hot chocolate ,therefore option (a) is correct.
What do you mean by the term solute ?A solute is a substance that is dissolved in a solvent to form a solution.
The concentration of a solute in a solution is a measure of how much of the solute is dissolved in the solvent.
Characteristics of solute -:
The solute cannot be separated from the solution by filtration .It is composed of one phase only. Solutes in solution are measured by their concentration. The concentration of a solute is the amount of solute divided by the total volume of solution.Solute is cocoa powder when we make a cup of hot chocolate ,hence option (a) is correct.
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. If a balloon will rise off the ground when it contains 0.0226 mol of helium in a volume of 0.460 L, how many moles of helium are needed to make the balloon rise when its volume is 0.865 L? Assume that temperature and pressure stay constant.
The number of moles of helium (He) needed to make the balloon rise is 0.043 moles.
How to calculate number of moles?The number of moles of a gas can be calculated using the following expression:
V₁/n₁ = V₂/n₂
Where;
V₁ = initial volumen₁ = initial moles V₂ = final volumen₂ = final molesAvogadro’s law to predict what will happen to the volume of a sample of gas as we change the number of moles. Because V/n is a constant for any given sample of gas (at constant P and T).
At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas.
0.46/0.0226 = 0.865/n
20.3539823n = 0.865
n = 0.043 moles
Therefore, 0.043 moles is the number of moles of the gas when the balloon rises.
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how many moles in 185cm³ two moles solution
Answer:
4.44 moles
Explanation:
first u have to change the units into dm cube.
cm cube÷1000=dm cube
185cmcube÷1000= 0.185dm cube
24dm cube= 1 mole(formula)
0.185dm cube × 24dm cube=4.44 moles
10 points
Solve this problem using Charles' Law:
Calculate the new temperature when a 2.0 L of a gas at 220 K is compressed to 1.0 L.
Question 3 options:
440 K
220 K
110 K
20 K
Answer:
110k because 2 x 110 =220
The ____________________ is the organ associated with the sense of touch.
a.
nose
c.
heart
b.
liver
d.
skin
Please select the best answer from the choices provided
476 nm = 4.76x10^[?] cm
Answer:
4.76×10¯⁵ cm
Explanation:
We'll begin by converting 476 nm to m. This can be obtained as follow:
1 nm = 1×10¯⁹ m
Therefore,
476 nm = 476 nm × 1×10¯⁹ m / 1 nm
476 nm = 4.76×10¯⁷ m
Finally, we shall convert 4.76×10¯⁷ m to cm. This can be obtained as follow:
1 m = 100 cm
Therefore,
4.76×10¯⁷ m = 4.76×10¯⁷ m × 100 cm / 1 m
4.76×10¯⁷ m = 4.76×10¯⁵ cm
Thus,
476 nm = 4.76×10¯⁵ cm
Dose anyone know what the independent, dependent variables would be. Also didn't know what category to put this in.
Answer:
umm use a calculator ok bye
NO FILES PLZZ NO FILES Which of the following best describes the removal of large expanses of forest for agriculture, or other uses?
A selective cutting
B
deforestation
с
strip cutting
D
sustainable harvesting
Answer: what is the answer
Explanation:
I need it nowwww
Design a synthesis of isopropyl cyclopentylacetate from ethyl acetoacetate, diethyl malonate, and alkenes possessing five carbons or fewer.
Answer:
Hello your question is incomplete attached below is the complete question
answer : attached below
Explanation:
The design is attached below
The reagents are : H₂SO₄, H₂O, HBr, NaOCH₂CH₃
For the scheme = 1.NaOH,H2O 2. H₃O+3, heat, SOCl₂, Et3N
Please help me fill in the blanks
Sublevels are indicated by letters s, p, d, and f.
How do write Electronic configuration?
Electron configurations have a standard notation that tells you the principle energy levels and sublevels that electrons occupy. here is Sulphur:
The atomic number of Sulphur is 16.
the electronic configuration of Sulphur is 1s2 2s2 2p6 3s2 3p4.
The 4s sublevel has lower energy than the 3d sublevel,
so, it fills next.
Which four different electron configurations are there?One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. According to its location on the periodic table, each element's electron configuration is distinct.
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are these reactions balanced or unbalanced ?
2. The nonmetals in the Groups 16 and 17________.
a) lose electrons when they form ions
b) gain electrons making them an anion
c) all have ions with a -1 charge
d) end in -ate
The nonmetals in the Groups 16 and 17 gain electrons making them an anion.
Why gaining electrons is a significant characteristic of nonmetals in Groups 16 and 17?The nonmetals of group 16 are made up of Oxygen, Sulfur, and Selenium whereas group 17, also called the halogen group is made up of Fluorine, Chlorine, etc.
The further right we go in the periodic table, the atomic size decreases. Due to the increase in the number of protons, the electrons are more tightly bound and the atom shows strong attraction to electrons.
The gain of additional electrons helps in the completion of octets for the atoms further making their configuration stable, and more alike to that of the noble gases.
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Plz help
.
S
S
S
S
Z
.
-33⁰C
Explanation:
Charles Law states V/T initial = V/T final
T must be in Kelvin.
100/300 = 80/x
(27⁰C + 273 = 300
100x = (300)(80)
100x = 24,000
x = 240⁰K
240 - 273 = -33⁰C
Which explanation describes the first part of a chemical reaction? Reactants collide to form products. Products collide to form reactants. Products collide to form a transition state. Reactants collide to form a transition state.
Answer:
Reactants collide to form a transition state.
Explanation:
So sorry if I’m wrong but I feel this is right
To solve such this we must know the concept of chemical reaction. The correct option is option B that is atoms in one compound switch places with atoms in another compound.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, combustion reaction, displacement reaction. "Reactants collide to form a transition state" describes the first part of a chemical reaction.
Therefore "Reactants collide to form a transition state" describes the first part of a chemical reaction. The correct option is option B.
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Step 4: How many of each type of atom should react so that the electrons
lost will equal the electrons gained?
A. one potassium and one iodine
B. two potassium and one iodine
C. one potassium and two iodine
D. two potassium and three iodine
Answer:
A. one potassium and one iodine
Explanation:
K is a metal and I is a nonmetal, so K will lose electrons to form a cation and I will gain electrons to form an anion. Together, they will be bonded through an ionic bond. To determine how many electrons they gain or lose and how many atoms are in the chemical formula, we need to consider the octet's rule: an atom will gain, lose, or share electrons until it has 8 electrons in its valence shell.
K belongs to Group 1 in the periodic table and it has 1 valence electron. So, it will lose 1 electron to complete the octet. The resulting cation is K⁺.I belongs to Group 17 in the periodic table and it has 7 valence electrons. So, it will gain 1 electron to complete the octet. The resulting anion is I⁻.We need 1 K⁺ and 1 I⁻ to form the neutral salt KI.
How many moles of solute are in a 125mL of a 5M HCl solution
Answer:
3.4
373.4
.45.=2
46.=3 .6.2=4
help
1. write the complete chemical symbol for the ion with 14 protons 15 neutrons and 18 electrons
2. write the complete chemical symbol for the ion with 27 protons 32 neutrons and 25 electrons
Answer:
a
Explanation:
The formation of ion occurs when an atom that is said to be neutral gains or losses electrons.
At the time it gains electrons, it is regarded that a negative ion (anion) is formed.
When it loses electron, it is regarded that a positive ion (cation) is formed.
Atomic number = No of protons and electrons occurring in a neutral atom.
Given that:
Protons = 14
electron = 18
Net Charge = no of proton - no of electron
= 14 - 18
= -4
Mass number = 14 + 15 = 29
So, the chemical symbol = [tex]Si^{-4}[/tex]
For ion with
27 proton, 32 neutrons and 25 electrons
Net charge = 27 - 25
= +2
Mass number = 27 + 32 = 59
Thus, the chemical symbol = [tex]Co^{+2}[/tex]
If an element has an atomic number 19, what is the element? If the mass number is 39, how many neutrons does it have? If it is a neutral atom how many electrons does it have?
Answer:
neutrons = 20
Explanation:
No. of Neutrons = Mass No. - Atomic No
= 39 - 19
=20
Answer:
1) What is the element? Potassium
2) how many neutrons does it have? 20
3) If it is a neutral atom how many electrons does it have? 39
Please mark as brainliest if answer is right
Have a great day, be safe and healthy
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Which of the following descriptions represents the community level of organization?
A) A single individual rabbit, of a certain species, living in a forest
B) A group of rabbits, all of the same species, living in a forest
C) All of the rabbits in a forest, as well as their predators and food plantsAll of the animals, plants, and non-living elements in a forest
D) All of the animals, plants, and non-living elements in a forest
Answer: C) All of the rabbits in a forest, as well as their predators and food plants
Explanation:
The community refers to all living things in a certain area including plants and animals. If the given area is a forest therefore, the rabbit being a living thing, as well as its predators and the plants that it relies on will be considered the community.
This is not unlike a human community where everyone in a given area is considered to be part of the community.
Answer:
C
Explanation:
I got this question on an edusmart.
How many total valence electrons are present
in the CH3Cl molecule? Please help
Answer:
I think the answer is 14 I am not sure
For this discussion, you get to explore one specific element and share the historical context and modern day application of that element with the class. Your initial post should address the following questions about the element you chose:
1. How did the element you chose get its name and who discovered it?
2. What are the properties this element possesses that places it where it is in the periodic table?
3. Write a sufficient summary of the element in common language that could be understood by the general public.
4. Describe the implications for society, benefits, drawbacks, practicality, and reactivity of the element.
5. What are some applications and hazards of this element and how is it commonly encountered?
6. Discuss your personal thoughts regarding the element.
7. Questions to your classmates that invite discussion and further the dialogue.
8. An embedded picture that is relevant to the discussion.
9. Give a citation of an external peer reviewed resource that you would like to
My exploration in one specific element as well as the sharing of the historical context and modern day application will be focused in the element Carbon. The essay is written below
What is carbon historical context?Carbon was discovered by the ancient Egyptians, and it gets its name from the Latin word "carbo," which means "charcoal."
Carbon is a nonmetal that is located in Group 14 of the periodic table. It has a unique ability to form a wide variety of chemical compounds, which is one of the reasons it is so important in modern chemistry. Carbon has four valence electrons, which allows it to form stable chemical bonds with other elements.
Carbon is a chemical element that is found in all living things. It is a key component of proteins, DNA, and other essential biomolecules. Carbon can exist in several different forms, including graphite, diamond, and various forms of carbon-based compounds called organic molecules.
Carbon has many important implications for society. It is used as a fuel to produce energy, and it is also a key ingredient in the production of steel and other metals. Carbon is also an essential component of many plastics and other synthetic materials. However, carbon can also have negative impacts on the environment, as the burning of fossil fuels releases carbon dioxide into the atmosphere, contributing to climate change.
Carbon has many practical applications, including its use as a fuel, a structural material, and a chemical feedstock. However, carbon can also be hazardous in certain situations. For example, inhaling carbon monoxide can be deadly, and carbon dust can be explosive. Carbon is commonly encountered in many different forms, including coal, oil, and natural gas.
Personally, I think that carbon is a very interesting element with a wide range of important applications. It is fascinating to consider the role that carbon plays in the biology of living organisms, as well as its practical uses in industry and technology.
Some questions for my classmates might include: What are some other interesting properties of carbon that you have learned about? Can you think of any examples of how carbon is used in your everyday life? Do you think that the benefits of carbon outweigh the potential drawbacks?
One peer-reviewed resource that I found informative is "The Many Forms of Carbon," an article published in the journal Chemical & Engineering News. (Citation: "The Many Forms of Carbon." Chemical & Engineering News, vol. 95, no. 39, 2017, pp. 38-54.)
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The heat of vaporization for benzaldehyde is 48.8 kJ/mol, and its normal boiling point is 451.0 K. Use this information to determine benzaldehyde's vapor pressure (in torr) at 49.5°C. Report your answer to three significant digits.
The vapor pressure at 49.5 °C is:
DP = 48.8 kJ/mol / 8.314 J/mol*K * (1/451.0 K - 1/322.65 K) * 49.5
DP = 0.24 torr (approx)
The vapor pressure of benzaldehyde at 49.5°C is approximately 0.24 torr.
How to calculate heat of vaporization?The heat of vaporization (ΔHvap) and the normal boiling point (Tb) can be used to determine the vapor pressure of a liquid at a given temperature using the Clausius-Clapeyron equation. The Clausius-Clapeyron equation states that the change in vapor pressure (DP) with temperature (DT) is directly proportional to the heat of vaporization (ΔHvap) and inversely proportional to the absolute temperature (T) in kelvin.
DP/DT = ΔHvap / R * (1/T)
where R is the gas constant.
We can use this equation to solve for the vapor pressure of benzaldehyde at 49.5°C.
First, convert 49.5°C to kelvin:
T = 49.5°C + 273.15 = 322.65 K
Next, we need to use the Clausius-Clapeyron equation to solve for vapor pressure at a temperature T and the normal boiling point Tb:
DP/DT = ΔHvap / R * (1/T) = ΔHvap / R * (1/Tb - 1/T)
DP = ΔHvap / R * (1/Tb - 1/T) * DT
The vapor pressure at 49.5 °C is:
DP = 48.8 kJ/mol / 8.314 J/mol*K * (1/451.0 K - 1/322.65 K) * 49.5
DP = 0.24 torr (approx)
The vapor pressure of benzaldehyde at 49.5°C is approximately 0.24 torr.
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The vapor pressure of the benzaldehyde is 196 torr.
What is the vapor pressure?We know that the vapor pressure would have to do with the ease that we can use to convert the substance that is in question from liquid to gas. When we have two substances that are at different temperatures than we have;
ln(P2/P1) = -ΔH/R(1/T1 - 1/T2)
P2 = final pressure
P1 = initial pressure
R = gas constant
T1 = initial temperature
T2 = final temperature
Thus;
ln(P2/1) = -48.8* 10^3/8.314(1/451 - 1/322.5)
lnP2 = -5869.6(0.0022 - 0.0031)
lnP2 = 5.28
P2 =e^5.28
P2 = 196 torr
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