2. Which was the independent variable in the experiment below? *
3 points
A. Amount of light
B. Soil type
C. Temperature
D. Health of plant
Answers
Answer:
I think it is C. Temperature, sorry if wrong.
Related Questions
2. How many moles of carbon dioxide, CO2, are in a 22 gram sample of the compound?
Answers
molar mass of CO2 = 44.01 g
22g / 44.01 = 0.50 moles CO2
What is the mass defect?
A. It is seen as an increase in the masses of daughter elements.
B. It is identified as a missing line on an absorption spectrum.
O C. It is the difference between measured mass and average isotope
mass.
D. It is the difference between nuclear mass and the mass of its
components.
SUB
Answers
Mass defect is define as the difference between nuclear mass and the mass of its components.
What is mass defect?As the name suggested that defect in mass of any substance given idea about the mass defect and it will be define as the difference between the atomic mass of an atom and sum of the masses of all constitute particles present inside the nucleus.
Mass of daughter nuclei will take in consideration when only nuclear reaction takes place.Missing line of absorption is not related to the mass, else it is related to the concentration.Difference between measured mass and average isotope is not considered in mass defect because it is calculated for the individual atom not for all isotopes of that atom.Hence it is the difference between nuclear mass and the mass of its
components.
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19. What is the new volume of a solution that is created when 4. 2 mL of a 9. 1 M NaOH stock solution is diluted to a concentration of 2. 8 M? (M1V1 = M2V2 )
A) 6. 0 mL
B) 7. 38 mL
C) 10. 1 mL
D) 13. 65 mL
Answers
Answer:
A 6.0
Explanation:
If 45.0 mL of a 4.00 M sodium sulfate (Na2SO4) solution is used for a reaction, how many moles of solute were present in the solution?
____ moles
Answers
Identify the lewis acid in this balanced equation: upper a g superscript plus, plus 2 upper n upper h subscript 3 right arrow upper a g (upper n upper h subscript 3) subscript 2 superscript plus. ag nh3 ag(nh3)2
Answers
The equation that has been the representation of the net ionic equation has been Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.
What is the balanced equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
The balanced chemical equation for the reaction has been:
[tex]\rm Mg(OH)_2+2HNO_3-- > Mg(NO_3)_2+H_2O[/tex]
The net ionic equation has been given as the ionic form of the reactants and product that has been formed in the reaction. The ions same on the product and reactant side of the equation has been eliminated in the net ionic equation.
The net ionic equation for the given chemical reaction has been:
[tex]\rm Mg^{2+}+OH^++2H^++2NO^{-}_3-- > Mg^{2+}+NO^{-}_3+2H_2O\\\\OH^{-}+2H^+-- > 2H_2O[/tex]
The equation that has been the representation of the net ionic equation has been Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O. Thus, option A is correct.
For more information about chemical equation, refer to the link:
brainly.com/question/20492533
Answer:
A on edge
Explanation:
Just trust
If 40 grams of NaCl was dissolved in 100 grams of water at 100 degrees Celsius, the solution would be.
a. ) saturated
b. )unsaturated
c. )supersaturated
d. )saturated with excess
Answers
Answer:
saturated solution
Explanation:
50 points Acids & Bases
please help me children
Answers
Answer:
See below ↓↓↓↓
Explanation:
1)
a)
HCl + NaOH → NaCl + H₂Ob)
HNO₃ + KOH → KNO₃ + H₂Oc)
Mg(OH)₂ + H₂CO₃ → MgCO₃ + 2H₂Od)
Al(OH)₃ + 3HCl → AlCl₃ + 3H₂OA basketball is pumped with air that is composed of three gases: hydrogen, oxygen, and
nitrogen. The three gases have partial pressures of 1.00 atm, 0.29 atm, and 0.99 atm.
What is the total pressure of the gas in the basketball?
Answers
Answer:
2.28 atm
Explanation:
According to Dalton's law of partial pressures the total pressure is equal to the sum of all of the partial pressures. Basically, just add the individual partial pressures to get the total pressure.
1.00+.29+.99=2.28atm total pressure
How does the speed of molecules of a gas change when the gas is heated
Answers
Look at the reaction below. upper h subscript 2 upper s upper o subscript 4 (a q) plus upper c a (upper o upper h) subscript 2 (a q) right arrow upper c a upper s upper o subscript 4 (a q) plus 2 upper h subscript 2 upper o (l). which substance is the base in the reaction? 2h2o (l) h2so4 (aq) caso4 (aq) ca(oh)2 (aq)
Answers
In the given reaction, the substance that is the base of the reaction is [tex]CaSO_4[/tex]. The correct option is C.
What is a base?The base is a slippery liquid that is bitter and turns red litmus paper to blue.
Bases react with acids to form salts.
Then bases have pH above 7.
Examples of bases are calcium carbonate, sodium hydroxide, etc.
Thus, the correct option is C.
Learn more about bases
https://brainly.com/question/485375
Answer:
D. Ca(OH)2 (aq)
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
Which of the following is the correct balanced equation for the breakdown of carbonic acid (H2CO3) into water and carbon dioxide? A. H2CO3 H20 + 3CO2 B. H2CO3 → H2O + CO2 C. 2H2CO3 + H2O + 3C02 D. 2H2CO3 - 2H20 + 3C02
Answers
Can I get brainliest please?
Оа
Corona
Oь
Prominence
Ос
Solar flare
Od
Sunspot
Answers
Answer:A solar flare is an intense burst of radiation coming from the release of magnetic energy associated with sunspots. Flares are our solar
Explanation:
Define the term oxide
Answers
Answer: is the chemical compound that contains one oxygen atom and one other element in it chemical formular
Explanation:
Oxide - is a binary compound of oxygen with a more electropositive element or group
Hope this helps :))
What is the oxidation number for s in the compound so3? (recall that o has an oxidation number of –2.) 0 2 4 6
Answers
The oxidation number for sulphur (S) in the given compound sulphur trioxide (SO₃) is +6.
What is the oxidation number?Oxidation number of any element is define as the number of exchangeable electrons from the outermost shell of an element.
For the given compound SO₃ no charge is present on the whole molecule and oxidation state of oxygen atom is -2, and let we assume that the oxidation state of sulphur atom is x and we calculate for x as:
x + 3(-2) = 0
x - 6 = 0
x = +6
Hence the oxidation state of atom is +6.
To know more about oxidation state, visit the below link:
https://brainly.com/question/8990767
The answer is D: 6+
Worked for me on EDGE 2023
why would scientists use a spectrometer in space.
A. To study the chemical composition of the surface of a planet
B. To detect the birth and death of distant start and galaxies
C. To convert light from stars into usable energy for humans
D. To maintain a constant air supply on board a space shuttle
Answers
Answer:
A. To study the chemical composition of the surface of a planet
Explanation:
Strictly speaking, a spectrometer is any instrument used to view and analyze a range (or a spectrum) of a given characteristic for a substance (for example, a range of mass-to-charge values as in mass spectrometry), or a range of wavelengths as in absorption spectrometry like nuclear magnetic radiation spectroscopy
-hope this helps!
Please help me on this question
Answers
Science question, Giving brainiest!
Answers
Answer:
im not 100% sure but i think it is :A
Explanation:
If 4.5 moles of nitric acid falls into 8000 L of pure water, what will be the change of the pH of the solution? Show all of your work for full credit. (Note that nitric acid dissociates completely and puts in one hydrogen ion for each molecule of nitric acid).
*due soon*
Answers
Answer:
3.24
Explanation:
It is known that nitric acid is a strong acid, so it will dissociate completely, resulting in [tex]H^+[/tex] and [tex]NO_3^-[/tex] ions being present in solution. We also know that pure water has a neutral pH due to the chemical equilibrium of [tex]H_2O(l)[/tex] ⇄ [tex]H^+(aq) + OH^-(aq)[/tex] signifying equal parts of hydrogen and hydroxide ions.
Now, we must convert from 4.5 moles of nitric acid to moles of hydrogen. This can be accomplished using unit conversions and the chemical dissociation equation [tex]HNO_3(s) - > H^+(aq) + NO_3^-(aq)[/tex]
[tex]4.5molHNO_3 * \frac{1 mol H}{1 mol HNO_3} = 4.5molH+[/tex]
Then, using the pH equation [tex]-log[H+] = pH[/tex] and the formula for molarity [tex]M = \frac{g}{L}[/tex], we can find the value of [tex][H^+][/tex] and in turn the pH of the resulting solution. Keep in mind that both answers for grams of the hydrogen ion and molarity of the hydrogenion should have two significant figures.
[tex]4.5mol H^+ * \frac{1.01gH^+}{1 mol H^+} = 4.6g H^+\\\frac{4.6gH^+}{8000L sol} = 5.8*10^{-4} M H^+[/tex]
Now the pH equation may be used.
[tex]-log(5.8*10^{-4}) = 3.24[/tex]
Note that logarithmic significant figures dictate that the logarithm of a number with x significant figures will result in a value with x digits after the decimal point, meaning that this answer will have two digits after the decimal point and three significant figures.
how to calculate amount of copper obtained from a reaction
Answers
Answer:
22g of copper?
Explanation:
A gas has a temperature of 14 degrees C and a volume of 4.5 L. If the temp is raised to 29 degrees C and the pressure is not changed, what is the new volume of the gas
Answers
Answer:
V1/T1 = V2/T2 (Charles' Law)
T is in Kelvin. Celsius temp plus 273.15 = K
T1 = 14 +273
= 287 K
T2 = 29 + 273
= 303 K
4.5 / 287 = V2 / 303
V2 = 4.75 L
= 4.8 L
can heat energy be converted into chemical energy
Answers
Please help me answer this question about fullerenes. 30 points available and brainliest.
Answers
Answer: B.
Hope this helps! :)
Mark me brainliest please.
Answer:
Large hollow-shaped molecules of hexagonal carbon rings
Explanation:
looks like a soccer ball
wikipedia
Chloroplasts and mitochondria are both involved in energy conversion in eukaryotic cells and share many similarities. Differentiate between chloroplasts and mitochondria. Choose ALL of the characteristics that apply ONLY to mitochondria.
A) Mitochondria need water and oxygen.
B) Mitochondria are only found in animal cells.
C) Mitochondria convert glucose into ATP energy.
D) Mitochondria have a double membrane and their own DNA.
E) Mitochondria require oxygen and release carbon dioxide.
Answers
Answer:
The answer is C and E
Explanation:
I just had that question
Answer:
c and e
Explanation:
4 NO(g) + 2 O2(g) = 2 N20468)
Answers
Answer:
The equilibrium concentrations are [N₂O] = 1.00 mol/L; [O₂] = 0.50 mol/L; [NO] = 1.00 mol/L. Kc = 2.0.
Explanation:
First, write the balanced chemical equation with an ICE table.2N₂O + O₂ ⇌ 4NOI/mol·L⁻¹: 0; 0; 3.00C/mol·L⁻¹: +2x; +x; -4xE/mol·L⁻¹: 2x; x; 3.00 - 4xAt equilibrium, [N₂O] = 2x mol/L= 1.00 mol/L.So x = 0.50Then [O₂] = x mol/L = 0.50 mol/Land [NO] = (3.00 - 4x) mol/L = (3.00 – 4×0.50) mol/L = 1.00 mol/LKc=[NO]4[N2O]2[O₂]=1.0041.002×0.50 = 2.0
What is the best definition of
nucleus?
A. The nucleus is the outer shell of the atom.
B. The nucleus is the center of the atom.
C. The nucleus is the combination of several
Answers
Answer:
usually round part of most cells that is enclosed in a double membrane, controls the activities of the cell, and contains the chromosomes. 2 : the central part of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons.
Explanation:
please consider as brainlest if i helped you
usually round part of most cells that is enclosed in a double membrane, controls the activities of the cell, and contains the chromosomes. 2 : the central part of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons.
What is the molar mass of NaCl? If you need to add 0.2 moles of NaCl to 500 mL of water, how many grams of NaCl do you need to add?
Answers
Answer:
321 g
Explanation
All you need to know here is that the molarity of a solution tells you the number of moles of solute present in exactly
1 L
of the solution.
In your case, a
2.20-M
sodium chloride solution will contain
2.20
moles of sodium chloride, the solute, for every
1 L
of the solution.
So if every
1 L
of this solution must contain
2.20
moles of sodium chloride in order for the solution to have a molarity of
2.20 M
, it means that
2.50 L
of this solution must contain
2.50
L solution
⋅
2.20 moles NaCl
1
L solution
=
5.50 moles NaCl
To convert the number of moles of sodium chloride to grams, use the molar mass of the compound.
5.50
moles NaCl
⋅
58.4 g
1
mole NaCl
=
321 g
−−−−−
The answer is rounded to three sig figs.
Which species can act as an acid?
A. S0₂
B.
NH4+
C. CO2
D.
PO43-
Answers
GLAD I CAN HELP!!! :)))))))
:))) <333 eee
How many liters do you need to make a 1.2 M solution using 54.4 grams of copper (II) fluoride?
Answers
Answer:
Our differences make us special.
Explanation:
Only smart people can answer 50points
Answers
We need M2
25(0.5)=100M212.5=100M2M2=12.5/100M2=0.125MWhat is formed when acids and bases come together in neutralization reactions?.
Answers
Answer:
Water and Salts
Explanation:
Because a neutralization reaction, which results in the formation of salt and water, occurs when an acid and a base react with one another. The H + ions from the acid and the OH - ions from the base combine to form water. As a result of the reaction, a solution with a neutral pH (pH = 7) is produced as the strong acids and strong bases completely dissociate.