Answer:see below
Explanation: The magnetic field will strengthen and the magnet will get warmer (resistance effect)
A student calculated the number of moles of carbon dioxide to be 0.30 moles in a 200.0 g sample of a gaseous mixture. What is the percent composition of carbon dioxide? (molar mass = 44.01 g/mol)
A. 0.066%
B. 13%
C. 30%
D. 6.6%
Considering the definition of percentage by mass, the correct answer is option D. the percent composition of carbon dioxide is 6.6%
Percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass=\frac{mass of solute}{mass of solution} x100[/tex]
Percent composition of carbon dioxideIn this case, you know:
mass of solute= 0.30 moles × [tex]\frac{44.01 grams}{1 mole}[/tex]= 13.203 grams (being 44.01 [tex]\frac{grams}{mole}[/tex] the molar mass of carbon dioxide)mass of solution= 200 gramsReplacing in the definition of percentage by mass:
[tex]percentage by mass=\frac{13.203 grams}{200 grams} x100[/tex]
Solving:
percentage by mass= 6.60 %
Finally, the correct answer is option D. the percent composition of carbon dioxide is 6.6%
Learn more about percentage by mass:
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37.9 grams of an unknown substance undergoes a temperature increase of
25.0*C after absorbing 969 J. What is the specific heat of the substance?
Answer:
1.023 J / g °C
Explanation:
m = 37.9 grams
ΔT = 25.0*C
H = 969 J
c = ?
The equation relating these equation is;
H = mcΔT
making c subject of formulae;
c = H / mΔT
c = 969 J / (37.9 g * 25.0*C)
Upon solving;
c = 1.023 J / g °C
Unit 2 Test
What makes up all of the populations in an area?
they
O Niche
Habitat
Ecosystem
Community
Which action could cause a sample of liquid to boil?
A. Decreasing the temperature of the liquid
B. Decreasing the sample size of the liquid
C. Decreasing the pressure on the liquid
D. Decreasing the volume of the liquid
Hurry please
Answer:
B
Explanation:
Decreasing the sample size of the liquid
hope it helps!
Electron dot diagram for four elements are shown. Which element would be found in Group 13?
Answer:
D. 1
Explanation:
Just took it :)
The element that would be found in Group 13 is
D. 1
The electron dot structure has three valence electrons.
Group-13 elements:
Group-13 is also known as the Boron family. This group belongs to p-block elements. The elements of this group will have three electrons in their outermost shell i.e. 3 valence electrons.
Example: Boron has atomic number 5.
Electronic configuration of Boron: [tex]1s^2 2s^2 2p^1[/tex]
Thus, the electron dot structure for group-13 is option D i.e. 1.
Find more information about Group-13 elements here:
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What is the answer helpnme plz
Help please! This is due in 15 mins
The maximum and minimum oxidation state that can be shown by iodine respectively is
A. +3, -1
B. +7, -1
C. +5, 0
D. +1, 0
Answer:
B -1 and +7
Explanation:
Iodine shows oxidation states of −1, +1, +3, +5, or +7.
Which of these is NOT a type of chemical reaction?
a
b
Synthesis
Decomposition
Single Replacement
The Mole
C С
d
Please can you help me from 1 to 6
Answer:
um
Explanation:
help you? you mean do it for you? nah man you can just use the calculator ;)
CAN SOMEONE PLEASE CHECK MY ANSWER FOR QUESTION 2
If it’s wrong please correct me
Thank you!!!
Answer:
It looks right to me make sure you have sig figs if the question asked for it though so you smalles figure would be 3 so with sig figs your answer would be 1190cm3
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
What are the reactants and products also add why
MARKING BRAINLIEST
Choose the products that complete the reaction. The chemical equation may not be balanced.
NaHCO3 + HC2H3O2
Answer: NaC2H3O2 + CO2 + H2O
PLS HELP DECODE THIS
The atomic number of an element tells you the number of:. P R O (G4) (E3) N S
10. Maslow refers to the stage where one reaches his or her full developmental potential as (1 point)
O belongingness.
O esteem.
O self-actualization.
O physiological
Answer: self-actualization (C)
Explanation:
it’s at the top of the hierarchy of needs.
1. In preparing his speech for a youth association, Eric considers the demographics and other important information about the people who will be listening to him speak. Like all successful speakers, Eric is engaging in the process of
C. Analyzing the audience
2. To gather formal information about audience members' attitudes, beliefs, and values, you can
D. ask open-ended and closed ended question on a survey
3. Debbie planned a speech calling for higher student fees. She thought about how her audience might react to this message. She prepared a survey and asked a group of her classmates to take it. What kind of audience analysis did Debbie use?
C. Formal
4. Why is audience analysis important?
A. It helps you understand the audience as much as possible before giving your speech
5. The audience's educational level is a factor related to
B. demographics
6. A speaker that collects information about the audience, evaluates what has been collected, and adapts his or her speech using that information is considered a(n) _____ speaker
B. Audience-centered
7. Maslow refers to the stage where one reaches his or her full developmental potential as
C. self-actualization
8. Which of the following is a method of collecting informal data about your audience?
D. observing the audience
9. Sara is preparing a speech to endorse a political candidate. She uses the information she gathered about her audience to determine their vales, beliefs, and attitudes so she can better prepare her speech. Sara is conducting which type of analysis?
A. Psychographic analysis
10. As you learn more about the audience, you are able to identify the beliefs, values, and attitudes of the audience. This is known as
B. Psychographics
I hope this helps!
What is the mass in grams of a 10.2cm3 block of copper
Answer:
91.4
Explanation:
Givens
d = 8.96
v = 10.2 cm^3
m =?
Formula
d = m / V
Solution
8.96 = m / 10.2 Multiply both sides by 10.2
8.96 * 10.2 = m
m = 91.392 grams
m = 91.4 grams rounded.
Sulfuryl chloride decomposes at high temperatures to produce sulfur dioxide and chlorine gases:
SO2Cl2(g) = SO2(g) + Cl2(g)
At 375°C the equilibrium constant Kc is 0.045. If there are 2.0 grams of sulfuryl chloride, 0.17 gram of sulfur dioxide, and 0.19 gram of chlorine present in a 1.0 Liter flask.
a. What is the value of the reaction quotient?
b. Is the system at equilibrium?
c. In which direction will the system move to reach equilibrium?
Answer:
[SO2Cl2] = = 0.015 M [SO2] = = 0.0027 M [Cl2] = = 0.0027 M Q = = = 4.8 × 10−4
No. Q < Kc, so reaction will shift to the right.
Explanation:
When the moon changes from all dark to all light, or from new moon to full moon, the moon is said to be...
changing shape
waxing
waning
gibbous
Answer:
i think its changing shape if I'm wrong I'm sorry
10) Calculate the energy change for the formation of LiCl(s) from its elements in their standard states and the following tabulated information: ?
1 Li(s) + 1/2 C12(s) — LiCl(s)
2 Li+(g) + Cl-(s) -- LiCl(s)
3 Li(s) — Li(g)
4 1/2 Cl2(g) - Cl(g)
5 Cl(g) + e- →Cl-(3) Li(g) → Lit(g) + e-
1-853 kJ/mol
2+159.4 kJ/mol
3+121.7 kJ/mol
4-348.6 kJ/mol
5+520.2 kJ/mol
A) +1305.7 kJ/mol
B) +296.9 kJ/mol
C) -400.3 kJ/mol
D) -627.2 kJ/mol
Answer:
-400.3 kJ/mol
Explanation:
13. Which of the following shows the correct arrangement of the
levels of biological organization if arranged from smallest to largest
group?
a. tissue, organ, organ system, organism, cell,
community, population, biosphere
b. cell, tissue, organ system, organ, organism,
population, community, biosphere
tissue, cell, organ, organ system, organism,
biosphere, community, population
d. cell, tissue, organ, organ system, organism, population,
community, biosphere
Answer:
option D is correct answer of this question
1. The calendar below shows a sample month of the year. Suppose that you see a full moon on the first day of this month.
Draw and label a picture of the full moon on this day.
Draw and label a picture of the third quarter moon on the day you would expect to see it.
Draw and label a picture of the new moon on the day you would expect to see it.
Draw and label a picture of the first quarter moon on the day you would expect to see it.
Answer:The 1st Quarter Moon is a primary Moon phase when we can see exactly half of the Moon's surface lit up. ... The First Quarter Moon rises around midday and is visible in the day sky. ... when the Moon has reached the first quarter of its orbit around Earth, hence the name. ... Full Moon Names · Taking pictures of the Moon.
Explanation:
Why do elements form lons? In other words, why do elements gain or lose electrons? Be specific.
Answer: Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion
What is the chemical formula for the compound ammonium phosphate? Use the list of polyatomic ions and the periodic table to help you answer.
A.
NH4H2PO4
B.
(NH4)2PO4
C.
(NH4)3PO4
D.
(NH4)4PO4
Answer:
c. (NH4)3PO4
Explanation:
Answer:
c is the right answer
Explanation:
as we know ammonium is NH4
AND PHOSPHATE IS PO4-3
SO WHEN WE MIX THEM THEY BECOME
(NH4)3PO4
please help
find molecular formula of a compound with a molar mass of 45.0 g/mol and an empirical formula of CH3
Answer: The molecular formula will be [tex]C_3H_9[/tex]
Explanation:
Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.
Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.
The empirical formula is [tex]CH_3[/tex]
The empirical weight of [tex]CH_3[/tex] = 1(12)+3(1)= 15g.
The molecular weight = 45.0 g/mole
Now we have to calculate the molecular formula:
[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{45}{15}=3[/tex]
The molecular formula will be=[tex]3\times CH_3=C_3H_9[/tex]
Thus molecular formula will be [tex]C_3H_9[/tex]
150.0 mL of oxygen is collected over water at 19.0oC and 100.0 kPa. If the dry volume becomes 100.0 mL and the pressure of the dry gas becomes 105.0 kPa, what will the new temperature be?
Answer:
The new temperature will be 204.4 K
Explanation:
As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:
"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
Pressure * Volume = constant
or P * V = k
Charles's Law consists of the relationship between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Finally, Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
This law indicates that the quotient between pressure and temperature is constant.
This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the molecules of the gas move faster. Then the number of collisions against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
You want to study two different states, an initial state and a final state. It will happen:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 100 kPaV1= 150 mLT1= 19 C= 292 K (being 0 C= 273 K)P2= 105 kPaV2= 100 mLT2=?Replacing:
[tex]\frac{100 kPa*150 mL}{292 K} =\frac{105 kPa*100 mL}{T2}[/tex]
Solving:
[tex]T2=105 kPa*100 mL*\frac{292 K}{100 kPa*150 mL}[/tex]
T2= 204.4 K
The new temperature will be 204.4 K
what caused the falling of the twin towers?
Answer:
ok horita te ayudo ok esperame okey bueno
George W. Bush lol nvm just trolling.
Correct answer is Alquaida flew with 2 airplanes into the twin towers at the 11. September 2001
How many milliliters of 0.188 M HClO 4 solution are needed to neutralize 50.00 mL of 0.0789 M NaOH?
a) 119
b) 0.742
c) 21.0
d) 0.0477
e) 8.39x10^-3
119 so a I think that's Is me anser
The volume of space it takes up, whereas its mass is the amount of matter it contains. A sample's density is the quantity of mass per unit of volume.
Equation:[tex]HClO_4 +NaOH \longrightarrow NaClO_4 + H_2O\\\\[/tex]
HClO₄ is a monoprotic strong acid.
1 mol of HClO₄ reacts with 1 mol of NaOH for neutralization.
Calculating the moles of NaOH [tex]= (0.0789\ M) \times (0.050\ L) = 0.003945\ mol[/tex]
Calculating the needed moles in HClO₄ [tex]= 0.003945 \ mol[/tex]
Calculating the HClO₄ Molarity that is 0.188 M
Calculating the HClO₄ volume that is needed [tex]= \frac{(0.003945\ mol) }{ (0.188\ M)} = 0.020\ L[/tex]
Therefore, the volume of HClO₄ that is needed = 20 mL
Find out more about the Stoichiometry here:
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What can you determine about the atomic structure of an element if you know the atomic number of the element and mass number of its isotope? Enter your answer in the space provided.
Answer:
THe atomic number of an element is the same number of protons and electrons the element has.
Explanation:
The atomic number is the number of protons that is equal to the of electrons. Also, the mass numbers can be used for the number of neutrons. So the isotope of the element and its valency can be determined by the atomic number and mass number.
What is the atomic number?Because they are calculated by counting whole items, the atomic b and mass number are always whole values (protons, neutrons, and electrons). The total number of subatomic particles found in an atom is equal to the sum of the mass number and atomic number for an atom (A-Z). The mass number indicates, in atomic mass units, the mass of the atom's nucleus (amu).
The amount of protons each element has determined its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.
All of the elements in the contemporary periodic table have rising atomic numbers, and as a result, increasing mass numbers. As you are aware, an atom is made up of protons, neutrons, and electrons.
We can determine an atom's valency by counting the number of electrons in its outermost shell. Similar to this, the atomic number and mass number of the atom are related to the number of protons and neutrons.
Therefore, the knowledge of the atomic number and mass number can help in determining the valency and isotope of the element.
Read more about the atomic numbers, here
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PbSO4 -> PbSO3 + O2 type of reaction
Answer:
Decomposition
Explanation:
This shows a compound splitting into two
By definition, PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.
First, you have to know that in a decomposition reaction, a single substance decomposes, producing two or more different substances. That is, in this type of reaction, two or more substances are formed from a compound.
The atoms that make up a compound are separated to give the products according to the formula:
AB → A + B
This type of reaction can occur spontaneously or caused by certain external factors, such as heat, which promote the decomposition of the molecule into simpler substances.
In this case, it is possible to observe that PbSO₄ → PbSO₃ + O₂ is a decomposition reaction, because a single substance decomposes producing two different substances.
Learn more:
https://brainly.com/question/8009068?referrer=searchResultshttps://brainly.com/question/24905694?referrer=searchResultshttps://brainly.com/question/13134296?referrer=searchResults_____ are added to the soil to improve the fertility of the soil
Answer:
Fertilisers
And also organic compounds
Pls help!!
1000 L of nitrogen and 2400 L of hydrogen are mixed to produce ammonia. The volume of ammonia produced is
A. 1200 L
B. 1000 L
C. 2400 L
D. 1600 L
Answer: D. 1600 L
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}[/tex]
[tex]\text{Number of moles of nitrogen}==\frac{1000L}{22.4L}=44.6moles[/tex]
[tex]\text{Number of moles of hydrogen}==\frac{2400L}{22.4L}=107.1moles[/tex]
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to stoichiometry :
3 moles of [tex]H_2[/tex] require 1 mole of [tex]N_2[/tex]
Thus 107.1 moles of [tex]H_2[/tex] will require=[tex]\frac{1}{3}\times 107.1=35.7moles[/tex] of [tex]N_2[/tex]
Thus [tex]H_2[/tex] is the limiting reagent as it limits the formation of product and [tex]N_2[/tex] is the excess reagent.
As 3 moles of [tex]H_2[/tex] give = 2 moles of [tex]NH_3[/tex]
Thus 107.1 moles of [tex]H_2[/tex] give =[tex]\frac{2}{3}\times 107.1=71.4moles[/tex] of [tex]NH_3[/tex]
Volume of [tex]NH_3=moles\times {\text {Molar volume}}=71.4moles\times 22.4L/mol=1600L[/tex]
Thus volume of ammonia produced is 1600 L