Answer:
1, 3, and 5
Further Information:
Careless farming - increases erosion
Crop rotation - does not increase erosion
Leaving fields unplanted- increases erosion
Clearing forests - does not increase erosion
Contour plowing - increases erosion
Hope this helps and brainliest would be greatly appreciated!!
Which of the following statements best explains why the atomic radius increases from top to bottom of the periodic table? A. The electronegativity decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. B. For the atoms lower in the periodic table, there is more difference in charge between the electrons and the protons, which allows electrons to orbit farther from nucleus. C. The ionization energy decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Answer:
D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Explanation:
Atomic radius increases down the group because down the group, there an increase in the number of principle energy levels occupied. Now, these higher principal energy levels are made up of orbitals that are larger than the orbitals from the lower energy levels in size.
Therefore, the effect of this is that the greater number of principal energy levels will outweigh the increase in nuclear charge since nuclear charge also increases down the group and this in turn makes the atomic radius to increase as we go down the group.
Answer: C. For the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus.
Explanation: As the valance electrons orbit farther from the nucleus the energy level increases from the top to the bottom of the periodic table. So the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus, which result in an increase in the atomic radius.
PLS HELP!! 40 POINTS (Absurd or Spam answers will be reported. No copying from other answers.)
Phases of Matter Activity
Now it is your turn to show what you know about phases of matter and thermal energy transfer! Your task is to create a presentation to explain the transformation of a substance as it changes phases. You may choose to write a story or create a comic strip. For your story or comic, you will create a main character and detail the adventure as your character is exposed to thermal energy, causing it to undergo phase changes from a solid, to a liquid, to a gas. You may create your own comic strip using drawings, presentation software, or this comic strip template.
Your presentation must include the following:
title and introduction of your character, including what substance the character is made of
source of thermal energy your character encountered (conduction, convection, and/or radiation)
detailed description and/or diagram of the particle transformation from solid to liquid phase
detailed description and/or diagram of the particle transformation from liquid to gas phase
You may get creative on this activity. If you are unsure if your idea or software for a presentation will work, contact your instructor for assistance. Be sure to review the grading rubric before you begin.
Answer:
lol i know this isnt the best but Your comic strip can be about how when you put smores in a campfire, the smores become burnt that is example of energy transfer because energy is traveling as heat to another object.
Explanation:
Which of the following is an empirical formula? a) H2O2 b) H2O c) C2H2 d) C4H8
Answer:
The correct answer is h20
Explanation:
i got it right on an exam.
how are atoms an example of unity?
A. All atoms have the same arrangement of electrons.
B. All atoms react with other atoms the same way.
C. All atoms of one kind share common properties.
D. All atoms have the same number of neutrons.
Answer: C. All atoms of one kind share common properties.
Explanation:
What is 17647.05882 rounded to 2 significant figures?
Which equation represents a redox reaction?
A. HCI + LiOH
-
LiCl + H20
B. AgNO3 + LICI
AgCl + LINO3
C. HNO3 + KOH - KCl + H20
D. 2NaBr + Cl2
-
2NaCl + Br2
SUBI
Answer:
D. [tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
Explanation:
Hello!
In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:
Since both chlorine and bromine remain as diatomic gases, their oxidation states in such a form is 0, but as anions with lithium cations they have a charge of - according to the following reaction and half-reactions:
[tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
[tex]Cl_2^0+2e^-\rightarrow 2Cl ^-\\\\2Br^- \rightarrow Br_2^0+2e^-[/tex]
Unlike the other reactions whereas no change in the oxidation states is evidenced.
Answer:
D. 2NaBr + Cl2
A balloon is floating around outside your window. The temperature outside is -1 °C, and the air pressure is 0.800 atm. Your neighbor, who released the
balloon, tells you that he filled it with 5.00 moles of gas. What is the volume of gas inside this balloon?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
HA
?
Vballoon
Value
Units
Submit
Part B
A 14.0 L gas cylinder is filled with 5.00 moles of gas. The tank is stored at 7 °C. What is the pressure in the tank?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
Answer:
140 L (3 sig-figs; includes the zero)*
Explanation:
PV = nRT => V = nRT/P
P = 0.800atm
V = ?
n = 5 moles
R =0.08206 L·atm/mol·K
T = -1°C = (-1 + 273)K = 272K
V = nRT/P = (5mol)(0.08206 L·atm/mol·K)(272K)/(0.800atm) = 139.5 L
*=> 140 Liters (3 sig-figs) => zero is a sig-fig b/c it was result of rounding 139.5 Liters to obtain 140 Liters.
please help. thank youuuu
Determine the [OH−] , pH, and pOH of a solution with a [H+] of 9.5×10−13 M at 25 °C.
Determine the [H+] , pH, and pOH of a solution with an [OH−] of 9.4×10−6 M at 25 °C.
Determine the [H+] , [OH−] , and pOH of a solution with a pH of 5.37 at 25 °C.
Determine the [H+] , [OH−] , and pH of a solution with a pOH of 9.63 at 25 °C.
Answer:
'See Explanation
Explanation:
Determine the [OH−] , pH, and pOH of a solution with a [H+] of 9.5×10−13 M at 25 °C.
Given [H⁺] = 9.5 x 10⁻¹³M => [H⁺][OH⁻] = 1.0 x 10⁻¹⁴ => [OH⁻] = 1.0 x 10⁻¹⁴/9.5 x 10⁻¹³ = 0.0105M
pH = -log[H⁺] = -log(9.5 x 10⁻¹³) = - (-1202) = 12.02.
pOH = -log[OH⁻] = -log(0.0105) = -(-1.98) = 1.98
Now you use the same sequence in the remaining problems.
NEED HELP ASAP FREE BRAINLIST
Answer:
7) C. Sodium
8) G. 1 valence electron
Explanation:
An unknown amount of water
was heated with 3.5 kJ, raising
its temperature from 26°C to
66°C. What was the mass of
the water?
Answer:
20.9grams
Explanation:
Using the formula:
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass of substance (g)
c = specific heat of water (4.184 J/g°C)
∆T = change in temperature (°C)
According to the provided information;
Q = 3.5kJ = 3.5 × 1000 = 3500J
m = ?
c of water = 4.184 J/g°C
∆T = 66°C - 26°C = 40°C
Using Q = m × c × ∆T
m = Q ÷ (c × ∆T)
m = 3500 ÷ (4.184 × 40)
m = 3500 ÷ 167.36
m = 20.9
mass = 20.9grams
5. A sample of pure acetyl salicylic acid had a mass of 0.268 grams. It was dissolved in NaOH and diluted to 500.00mL in a volumetric flask.
a. What is the concentration of aspirin in the solution?
b. If an 8.00mL sample of this solution was pipetted into a volumetric flask and diluted to 100.00mL, what is the concentrated of aspirin after this dilution?
Answer:
a. 5.36x10⁻⁴ g/mL
b. 4.29x10⁻⁵ g/mL
Explanation:
As the units for concentration are not specified, I'll respond using g/mL.
a. We divide the sample mass by the final volume in order to calculate the concentration:
0.268 g / 500 mL = 5.36x10⁻⁴ g/mLb. We can use C₁V₁=C₂V₂ for this question:
8.00 mL * 5.36x10⁻⁴ g/mL = C₂ * 100.00 mL C₂ = 4.29x10⁻⁵ g/mLHow are ionic bonds like magnets??
Answer:the opposite charge attracts like magnets
Explanation:
Acetic acid and water react to form hydronium cation and acetate anion, like this:
HCH3CO2(aq) + H2O(l) → H3O^+ (aq) + CH3CO2^-(aq)
Imagine 226. mmol of CH3CO2- are added to a flask containing a mixture of HCH3CO2, H2O, H3O and CH3CO2- at equilibrium, and then answer the following question.
What is the rate of the reverse reaction before any CH3CO2^- has been added to the flask?
Answer:
The answer is "Greater than zero, and greater than the rate of the reverse reaction".
Explanation:
It applies a rate of reaction to the balance, a forward response dominates until it reaches a constant. This process is balanced before 52 mmol of the reactant[tex]HC H_{3} \ CO_2[/tex], to which 3 is added. In balance, that rate of the forward reaction was its rate with forwarding reaction, both of which are higher than 0 as the response has achieved balance so that both species get a level greater than 0.
What does pcv means in medical terms
Answer:
packed-cell volume
Explanation:
Carbon dioxide and water react to form methanol and oxygen, like this:
2CO2(g) + 4H2O(g) → 2CH3OH(l) + 3O2 (g)
At a certain temperature, a chemist finds that a 7.5L reaction vessel containing a mixture of carbon dioxide, water, methanol, and oxygen at equilibrium has the following composition:
Compound Amount
CO2 3.28g
H2O 3.86g
CH3OH 1.51g
O2 2.80g
Required:
Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.
Answer:
24x10³
Explanation:
2CO₂(g) + 4H₂O(g) → 2CH₃OH(l) + 3O₂ (g)
The equilibrium constant for this reaction is:
Kc = [tex]\frac{[O_2]^3}{[CO_2]^2[H_2O]^4}[/tex]
The expression of [CH₃OH] is left out as it is a pure liquid.
Now we convert the given masses of the relevant species into moles, using their respective molar masses:
CO₂ ⇒ 3.28 g ÷ 44 g/mol = 0.0745 mol CO₂H₂O ⇒ 3.86 g ÷ 18 g/mol = 0.214 mol H₂OO₂ ⇒ 2.80 g ÷ 32 g/mol = 0.0875 mol O₂Then we calculate the concentrations:
[CO₂] = 0.0745 mol / 7.5 L = 0.0099 M[H₂O] = 0.214 mol / 7.5 L = 0.0285 M[O₂] = 0.0875 mol / 7.5 L = 0.0117 MFinally we calculate Kc:
Kc = [tex]\frac{0.0117^3}{0.0099^2*0.0285^4}[/tex] = 24x10³What are at least 3 pros of using solar energy ?
Answer:
Renewable Energy Source. Among all the benefits of solar panels, the most important thing is that solar energy is a truly renewable energy source
Reduces Electricity Bills
Diverse Applications
Explanation:
Plz answer ASAP
At what point during the digestive process does your body begin to receive energy from the food?
Answer:
this should help *not a virus
Explanation:
https://kidshealth.org/en/teens/digestive-system.html
Rank the following compounds in order of decreasing acid strength using periodic trends. Rank the acids from strongest to weakest.
a. HCl
b. H2S
c. HBr
d. BH3
Answer:
HBr > HCl > H2S > BH3
Explanation:
In many acids, the magnitude of electronegativity of the nonmetal determines the strength of the acid. The less electronegative the non-metal is, the stronger the acidity of the acid.
This is because the less electronegative the nonmetal is, the more easily the H-X bond is broken since it is longer and weaker.
This explains the order of acid strength shown in the answer above.
when ammonium nitrate is found at a fire scene, it may undergo thermal decomposition producing which materials?
Answer:
nitrous oxide
Explanation:
All of these are examples of things that produce light energy except.
a. candle
b.flashlight
cDesklamp
d.compass
Answer:
Explanation:
A compass. Its main purpose is to tell what direction you are travelling.
Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral.
a. KCl
b. NaClO
c. Al(ClO4)3
d. NH4Cl
e. C5H5NHF
f. NaBr
g. Ca(NO2)2
Answer:
a) Neutral
b) Basic
c) Acidic
d) Acidic
e) Basic
f) Neutral
g)
Explanation:
a) KCl is a neutral salt because K ion in solution form produces both acid and base (KOH)
b) NaClO produces basic solution because ClO− is the conjugate base of a weak acid
c) Al(ClO4)3 will produce acidic solution because ClO4 is component of strong acid
d) NH4Cl will produce acidic solution because NH4+ ion is a strong conjugate acid of the weak base and Cl- is a weak conjugate base of the strong acid
e) Basic
f) Neutral salt
g) Acidic
What is the reaction when you take hydrogen gas and oxygen gas to form liquid hydrogen peroxide
Answer:
Hydrogen gas (H2) and oxygen gas (O2) react to form liquid hydrogen peroxide (H2O2). The atoms of the reactants have combined to form a new substance. The new substance has its own set of properties that is different from the properties of each reactant.
Explanation:
The blue colour of the sky results from the scattering of sunlight by air molecules. Blue light has a frequency if about 7.5*10^14Hz
Calculate the energy of a mole of photon associated with this frequency
Answer: The energy of a mole of photon associated with this frequency is [tex]49.5\times 10^{-20}J[/tex]
Explanation:
The energy and frequency are related by :
[tex]E=N\times h\times \nu[/tex]
E = energy of photon
N = number of moles = 1
h = planks constant = [tex]6.6\times 10^{-34}Js[/tex]
[tex]\nu[/tex] = frequency = [tex]7.5\times 10^{14}Hz[/tex]
[tex]E=1\times 6.6\times 10^{-34}Js\times 7.5\times 10^{14}s^{-1}=49.5\times 10^{-20}J[/tex]
The energy of a mole of photon associated with this frequency is [tex]49.5\times 10^{-20}J[/tex]
Which type of material incorporates a variety of substances to enhance desired properties such as strength and flexibility?
Answer:
its a polymer
Explanation:
A substance has a specific heat capacity of 2.0 J/g °C. How many joules are needed to raise the temperature of 30.0 g of this substance from 0°C to15°C?
a. 1 J
b. -1 J
c. -900 J
d. 900 J
Answer:
g
Explanation:
know what you think about th can get it
Answer:
[tex]\Large \boxed{\sf 900 \ J}[/tex]
Explanation:
Use formula
[tex]\displaystyle \sf Energy\ (J)=mass \ (g) \times specific \ heat \ capacity \ (Jg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)[/tex]
Substitute the values in formula and evaluate
[tex]\displaystyle \sf Energy\ (J)=30.0\ g \times 2.0 \ Jg^{-1}\°C^{-1} \times (15\°C-0\°C)[/tex]
[tex]\displaystyle Q=30.0 \times 2.0 \times (15-0 )=900[/tex]
Calculate the morality of a 35.4% (by mass) aqueous solution of phosphoric acid (H3PO4). Molar mass of H3PO4 is 98.00g/mol
Answer:
no idea with the answer pls check with otherr
what volume of nitrogen gas is equal too 3.42x10^22 molecules of this substance
if i am correct the volume of nitrogen gas has to equal to molecules density, making the substance 1.27 liters :)
Some birds migrate 20,000 miles. If 1 mile is 1.6 kilometers, calculate the distance these birds fly in kilometers.
Answer:
32000 kilometers
Explanation:
In order to convert from miles to kilometers, we need to use a conversion factor. In other words, we put miles in the denominator and kilometers in the numerator, as follows:
20000 miles * [tex]\frac{1.6km}{1mile}[/tex] = 32000 kilometersThat way the units for miles cancel each other, leaving the equivalent amount in kilometers.
Which of the following represents the atomic number of an element?
Answer:
The atomic number is the number of protons in the nucleus
does Al3+ gain or loose electrons?
Answer:
gain
Explanation: