To find the density of the unknown piece of metal, we can use the formula:
Density = mass / volume.
How to find the density ?The volume of the metal can be calculated by deducting the starting water volume (50.0 ml) from the final water volume (53.4 ml) after the metal is introduced. We know the mass of the unknown metal is 23.5 g.Volume of metal = 53.4 ml - 50.0 ml = 3.4 ml.Now we can substitute the values into the density formula: Density = 23.5 g / 3.4 ml = 6.9 g/ml.Therefore, the density of the unknown piece of metal is 6.9 g/ml.To know more about density , check out :
https://brainly.com/question/1354972
#SPJ1
These steps are followed when using the half-life of carbon-14 to determine
the age of an object that contains carbon. What is the correct order of these
steps?
A. Use the half-life of carbon-14 to determine the number of half-lives
that have passed.
B. Use the number of half-lives that have passed to determine the age
of the object.
C. Measure the ratio of parent and daughter nuclei.
A. B, C, A
B. C, A, B
O C. A,B,C
OD. A,C,B.
Answer:
B. C, A, B
Explanation:
We can measure the age of an artifact by comparison of the activities a living sample with that of the artifact. This is so because the activity of the living sample represents the original activity of the artifact.
So, the steps involved in determining the age of an artifact is to measure the ratio of the parent and daughter nuclei. Then we use the half life of carbon to find out how many half lives have passed. Using this number of half lives that has passed, we can compute the age of the object.
Answer: B.A.C
Explanation:
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
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.)
Learn more about Carbon from
https://brainly.com/question/20994647
#SPJ1
For this assignment, you will make a scale model—a “core sample”—showing the layers of the Earth: crust, lithosphere, asthenosphere, mantle, outer core, and inner core.
_____ molecules are always synthetic.
A synthetic ingredient is a substance that has been synthesized in a lab using different chemical procedures. Its goal is to mimic a natural chemical to duplicate its structure and, consequently, its fragrance.
What is synthetic ingredient?In most cases, it refers to a naturally occurring substance, like hyaluronic acid, which was formerly extracted from animals and has now been molecularly copied in a laboratory to provide the same results. Not everything that is manufactured or chemical is inherently harmful to you. Although not all synthetic cosmetic components are the same, some have been proven to be toxic, accumulate in the body over time, and have been associated with cancer as well as irritations of the skin and mucous membranes.
To know more about synthetic ingridient, check out:
https://brainly.com/question/29774084
#SPJ1
What is the balanced chemical symbol equation for silicon + water?
Answer: not 100% sure.
Explanation:
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.
To learn more about electron gain click here:
brainly.com/question/14351799
#SPJ1
example of stains remover in chemistry
Bi-phosphate detergents
Hypochlorous
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
What is the name of the ionic compound formed from lithium and bromine?
Why is the answer lithium bromide? What is the indicator that this is the correct name, rather than lithium bromate? Is this because a compound would need to contain 3 different atoms and oxygen to have the name lithium bromate? Is that why NaNO3 is Sodium Nitrate?
Answer:
The answer is lithium bromide because it is the combination of a metal (lithium) and a nonmetal (bromine). The indicator that this is the correct name, rather than lithium bromate, is that the compound is composed of only two elements and does not contain oxygen. Yes, this is why NaNO3 is Sodium Nitrate; it is composed of three different elements (sodium, nitrogen, and oxygen).
Explanation:
How many molecules of copper would be produced by reacting 54.0 grams of copper.
Answer:
48 this answer is wrong so don't
nitrogen dioxide does not rekindle a glowing splinter but support the combustion of carbon, phosphorus, lead etc, explain why given the equation of the reaction
Answer:
Nitrogen dioxide does not rekindle a glowing splinter becuase it is a not a very good oxidant. However, it will support the combustion of burning substances that are able to decompose it into nitrogen and oxygen gas.
NO₂ (g) ----> N₂ (g) + O₂
The oxygen then produced will go ahead to rekindle the glowing splinter.
Explanation:
Nitrogen dioxide isa reddish brown gas that is given when trioxiponitrate (v) salts, for example Lead (ii) trioxonitrate (v) of heavy metals are heated.
It is an mild oxidizing agent due to the presence of oxygen in the molecule of the compound.
It does not support combustion and does not burning air because of the inertnesss of the nitrogen atom. However, it will support the combustion of burning substances that are able to decompose it into nitrogen and oxygen gas.
For example, phosphorus is a very combustible material due to its low ignition temperature of 35°C. It catches fire spontaneously in air. Nitrogen dioxide is decomposed by burning phosphorus to nitrogen and oxygen. The oxygen produced supports further combustion of the burning phosphorus.
NO₂ (g) ----> N₂ (g) + O₂
an oxygen atom, the number of nucleons is 16. What is its atomic mass?
Answer:
oxygen-16 is a stable isotope of oxygen, having 8 neutrons and 8 protons in its nucleus. It has a mass of 15. u
are these reactions balanced or unbalanced ?
Please help me I really need help
Answer:
wow okay um so first you go home, get in bed, never open that computer again
Explanation:
Which reaction results in the GREATEST increase in entropy?
A)
(diamond)— Сgraphite)
B)
CO2(s) — CO2(g)
C)
H2O(s) — H20(5)
D)
2H2(g) + O2(g) → 2H2O(1)
This is Yolanda's desk. What could Yolanda do to increase the amount of force needed to move the desk?
Answer:
The last one.
Explanation:
The other ones add more force or give the same but the last one reduces it.
How do seismologists measure earthquakes?
A. By the circumference of the epicenter
B. In terms of the number of P-waves
C. By the depth of the focus
D. In terms of energy released
Answer:
A. By the circumference of the epicenter
Explanation:
If the Earth's lithospheric plates begin to move slowly, stresses emanate in the crust, most at times close to the plate boundaries. These stresses (compression, tension strain, and shear) accumulate in the crust until they surpass the rock's strength or the pressure around an internal fault. And there's a sudden slippage of rock around a fault.
The planet shakes and the rocks lurch to their new position in a matter of seconds as the stress energy is released. Seismic waves move away from the broken portion of the fault, just like ripples from a pebble landing on calm water.
Seismologists may estimate when the slippage started on a fault, the area of the slipping fault, the sum of slippage or fault throw (i.e. just how much the crust moved), and the length of time it takes for the slippage to happen by measuring the circumference of the epicenter which is the mapped area where the earthquake is taken place.
which statments regarding the henderson-hasselbalch equation are true?
Complete question is;
Which statements regarding the Henderson-Hasselbalch equation are true?
1. If the pH of the solution is known as is the pKa for the acid, the ratio of conjugate base to acid can be determined.
2. At pH = pKa for an acid, [conjugate base] = [acid] in solution.
3. At pH > pKa for an acid, the acid will be mostly ionized.
4. At pH < pKa for an acid, the acid will be mostly ionized.
A. All of the listed statements are true. B. 1, 2, and 3 are true.
C. 2, 3, and 4 are true.
D. 1, 2, and 4 are true.
Answer:
B. 1, 2, and 3 are true.
Explanation:
The formula for the Henderson-Hasselbalch equation is:
pH = pka + log₁₀([A^(-)]/[HA])
Where;
PH is acidity of solution
ka is acid dissociation constant
A^(-) is concentration of conjugate base
HA is concentration of Acid
- For statement 1; If the pH of the solution is known as is the pKa for the acid, the ratio of conjugate base to acid can be determined;
pH = pka + log₁₀([A^(-)]/[HA])
pH - pka = log₁₀([A^(-)]/[HA])
10^(pH - pka) = ([A^(-)]/[HA])
Since we can find the ratio as seen, then the statement is true
- For statement 2: At pH = pKa for an acid, [conjugate base] = [acid] in solution;
We will substitute pH for pKa;
pH = pH + log₁₀([A^(-)]/[HA])
This give;
0 = log₁₀([A^(-)]/[HA])
10^(0) = [A^(-)]/[HA]
1 = [A^(-)]/[HA]
Thus; [A^(-)] = [HA]
Thus, the statement is true
- For statement 3: At pH > pKa for an acid, the acid will be mostly ionized;
This means that;
pH - pKa is greater than 0 and thus;
10^(pH - pKa) is greater than 1.
Thus;
[A^(-)]/[HA] > 1
[A^(-)] > [HA]
So more acid is ionized than base.
So the statement is true.
- For statement 4: At pH < pKa for an acid, the acid will be mostly ionized;
This means that;
pH - pKa is less than 0 and thus;
10^(pH - pKa) is less than 1.
Thus;
[A^(-)]/[HA] < 1
[A^(-)] < [HA]
So we have more base ionized than acid. So statement is false
What is a flame test used for?
A. To identify an unknown sample by its emission spectrum
B. To determine the ionization energies of electrons
C. To remove impurities from a sample through burning
D. To identify an unknown sample by its melting point
The flame test used for to identify an unknown sample by its emission spectrum
What is the purpose of a flame test?A metal or metalloid ion discovered in an ionic compound can be identified, or at least its potential identification, using the flame test, a qualitative chemical test. It's possible for the compound to emit a distinctive colour that may be seen with the unaided eye if it's placed in a gas burner's flame. To determine whether metal and metalloid ions are present in the sample, chemists employ a qualitative examination known as a flame test. The metal ions heated in the gas burner don't all produce colour. The quickest and most straightforward method for determining whether group 1 metal ions are present in the chemical is a flame test. A wire or wooden splint is dipped into a sample solution or coated with the substance to be tested.To learn more about flame test refers to:
brainly.com/question/26873482
#SPJ1
Answer: to identify an unknown sample by its emission spectrum
Explanation:
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.
Learn more about vapor pressure in brainly.com/question/11864750
#SPJ1
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
Learn more about vaporization:https://brainly.com/question/14480429
#SPJ1
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
Cells grouped together to make a specific part of the body of a plant or animal are called:
A. an organism
B. photosynthesis
C. a tissue
Calculate the change in enthalpy for the following reaction:
4NH3 (g) + 7O2 (g) --> 4 NO2 (g) + 6 H20 (l)
AH NH3= -46
AH4NO2= +34
AH+H200=-286
AH reaction= ____ kJ/mol
Is this reaction endothermic or exothermic?
Answer:
-1396 kJ
Explanation:
Let's consider the following balanced equation.
4 NH₃(g) + 7 O₂(g) ⇒ 4 NO₂(g) + 6 H₂O(l)
We can calculate the standard change in enthalpy for the reaction (ΔHr) using the following expression.
ΔHr = ∑ np × ΔHf(p) - ∑ nr × ΔHf(r)
where,
n: molesΔHf: standard enthalpies of formationp: productsr: reactantsΔHr = 4 mol × ΔHf(NO₂(g)) + 6 mol × ΔHf(H₂O(l)) - 4 mol × ΔHf(NH₃(g)) - 7 mol × ΔHf(O₂(g))
ΔHr = 4 mol × (34 kJ/mol) + 6 mol × (-286 kJ7mol) - 4 mol × (-46 kJ/mol) - 7 mol × (0 kJ/mol) = -1396 kJ
A 2.5 L container is filled with propane. The ambient temperature is 25°C and the
pressure in the container is about 3 atmospheres. If the temperature in the car
reaches 55°C (about 130°F), what will be the pressure in the container?
(please show work)
Answer:
3.3atm is the new pressure of the container
Explanation:
In the car, the temperature of the container increases from 25°C =298K to 55°C = 328K. To solve this question we must use the Boyle's law that state that the pressure of a gas is directly proportional to its absolute temperature under constant volume. The equation is:
P1T2 = P2T1
Where P is pressure and T absolute temperature of 1, initial state of the gas and 2, final state.
Replacing:
P1 = 3atm
T2 = 328K
P2 = ?
T1 = 298K
3atm*328K = P2*298K
P2 = 3.3atm is the new pressure of the container
Answer:
3.3 atm
Explanation:
First we convert 25 °C and 55 °C to K:
25 °C + 273.16 = 298.16 K55 °C + 273.16 = 328.16 KWe can solve this problem by using Gay Lussac's law, which states that at constant volume:
T₁P₂=T₂P₁Where in this case:
T₁ = 298.16 KP₂ = ?T₂ = 328.16 KP₁ = 3 atmWe input the data:
298.16 K * P₂ = 328.16 K * 3 atmAnd solve for P₂:
P₂ = 3.3 atmImagine that you are a scientist working in a very dry desert environment. This location has been experiencing a terrible drought, so there has been very little rainfall over the last few years. The drought is affecting the local farms, especially the farms that grow corn. You are asked to help choose a variety of corn that will grow the best in these drought conditions.
Which of the four varieties of corn that you tested in the lab would you choose?
Sunburst Variety
Golden Kernel Variety
Chok Full 'O Goodness Variety
Cob-o-Rama Variety
Why do you think this variety is the best choice?
Based on the information provided, I would recommend the Sunburst Variety of corn as the best choice for growing in the drought conditions of the desert environment.
What is the corn about?Sunburst Variety of corn has been specifically developed to be drought-tolerant, meaning that it can survive and produce a good yield even with minimal rainfall.
Therefore, I would recommend the Sunburst variety of corn as the best choice for growing in the desert environment due to its drought-tolerance, deep root system, heat tolerance, high yield, and good quality grain.
Learn more about corn from
https://brainly.com/question/397421
#SPJ1
What problems did Haber face? Think about equilibrium!
In your
explanation include the words nitrogen, hydrogen, ammonia, equilibrium, and
pressure.
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~
I will give brainliest
Fill in the blank using the word the same as or different than.
Other planets, such as Mars and Jupiter, have year-lengths that are ___________________________________
the length of a year on Earth.
Answer:
Different because it depends how long the planets take a single orbit around the sun. :) Hope this helps
Explanation:
Other planets, such as Mars and Jupiter, have year-lengths that are different than the length of a year on Earth.
What is a planet?A planet can be defined as a large astronomical (celestial) body that has sufficient mass to allow for self-gravity and make it assume a nearly circular shape, which is known as hydrostatic equilibrium.
Based on astronomical records, a planet revolves in its orbit around the Sun in the solar system and as such, a planet which is closest to the Sun would travel the fastest while experiencing stronger gravitational pull.
In this context, other planets, such as Mars and Jupiter, have year-lengths that are different than the length of a year on Earth because of the difference in time to perform a single orbit around the Sun.
Read more on planets here: brainly.com/question/1286910
an empty 5L, solid steel scuba tank containing 2 ¨bobs" of particles has a pressure of 765 mmHg then it is completely filled to 32 ¨bobs" of gas what is the pressure and volume of the filled tank
The new volume of the system can be found to be 4.9 L.
What is the new volume?We have to know that we do use the Boyle's law when we are trying to get the association that we know that does exist when we are looking at the volume and the pressure of the gas and the both can be shown to be inversely proportional.
We then have that;
Initial pressure(P1) = 765 mmHg
Initial volume (V1) = 5 L
Final pressure (P2)= 780 mmHg
Final volume (V2) = ?
Then;
P1V1 = P2V2
V2 = 765 * 5/780
V2 = 4.9 L
As such, we can see from the calculation that the new volume that we would obtain is 4.9 L
Learn more about Boyle's law:https://brainly.com/question/1437490
#SPJ1