Answer:
3
Explanation:
7.02 three sig digits
A way of generating dry O2 in the lab is to heat potassium chlorate. If you determined that 25 grams of O, are needed, how much potassium chlorate do you need to start with? 2KCI0, ->(heat)2KCI + 30,
Answer:
About 64 grams of KClO₃.
Explanation:
Potassium chlorate dissociates according to the equation:
[tex]\displaystyle 2\text{KClO$_3$} \xrightarrow{\text{heat}} 2\text{KCl} + 3\text{O$_2$}[/tex]
To determine the amount of KClO₃ necessary to produce 25 grams of O₂, we can convert grams of O₂ to moles; moles of O₂ to moles of KClO₃; and finally to grams of KClO₃.
The molecular weights of O₂ and KClO₃ are 16.00 g/mol and 122.55 g/mol.
Hence:
[tex]\displaystyle 25\text{ g O$_2$} \cdot \frac{1\text{ mol O$_2$}}{32.00\text{ g O$_2$}} \cdot \frac{2\text{ mol KClO$_3$}}{3\text{ mol O$_2$}} \cdot \frac{122.55\text{ g KClO$_3$}}{1\text{ mol KClO$_3$}} = 64\text{ g KClO$_3$}[/tex]
In conclusion, about 64 (to two significant digits) grams of KClO₃ is needed.
How many grams of potassium iodide (KI) are required to prepare 50 mL of a 0.30 M
solution?
Answer:
137 g
Explanation:
Since1 L=103 mLyou can say that your sample must contain 550.0mL solution⋅1.50 moles KI103mL solution=0.825 moles KITo convert the number of moles of potassium iodide to grams, use the molar mass of the compound.0.825moles KI⋅166.003 g1mole KI=137 g−−−−−
Which are produced when HCl reacts with Ca(OH)2?
Cl2, H3, and CaO
CaCl and H3O
CaO, Cl2, and H2O
CaCl2 and H2O
Answer:
b did the test
Explanation:
did the test
A balanced chemical equation obeys the law of conservation of mass. The reaction of HCl with Ca(OH)₂ is a weak base - strong acid reaction. The products formed are CaCl₂ and H₂O. The correct option is D.
What is a balanced chemical equation?A chemical equation in which the number of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The coefficients are the numbers which are added to balance the chemical equation.
The balanced equation for the reaction of HCl with Ca(OH)₂ is given as:
Ca (OH)₂ (s) + 2HCl (aq) → CaCl₂ (aq) + 2H₂O (l)
Here one mole of Ca (OH)₂ reacts with two moles of HCl and gives one mole of CaCl₂ and two moles of H₂O respectively. Here Ca (OH)₂ is a white precipitate and HCl is a aqueous solution.
Thus the correct option is D.
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19. Which reaction will form a salt and water?
Aa precipitation reaction
Ba displacement reaction
Can acid-base neutralization
Dan ionic dissociation reaction
Answer:
acid-base neutralization
Explanation: When a base and acid react, it neutralizes the substance making it a neutral substance, which is water and a salt
what is the oxidation number of sulphur Cr2SO4
should be Chromium(III) sulfate: Cr₂(SO₄)₃
the oxidation number:
Cr₂(SO₄)₃ = 0
Cr = +3
SO₄ = -2
S + 4.O = -2
S + 4.-2 = -2
S = +6
Choose all the answers that apply.
The troposphere is _____.
the warmest layer
responsible for weather and clouds
the coldest layer
warmed by the Earth's surface
the lowest layer
Answer:
The lowest layerWarmed by earth surfaceExplanation:
Troposphere is the lowest layer located on atmosphere of earthIt contains all green house gases so it becomes warmed by reflection of heat from earth surfaceAnswer:
warmed by the Earth's surface
the lowest layer
Explanation:
What is the mass in kilograms of a sample containing 2.4 x 10^{24} atoms of this element? Do not use scientific notation.
If you put 5ml of coffee into 15ml of water how much was the coffee diluted
For 5ml of coffee into 15ml of water, the dilution of the coffee is mathematically given as
X=0.25ml
Generally, the equation for the Total volume is mathematically given as
Tv =inital v+final volume
Therefore
Tv=5ml+15ml
Tc=20ml
In conclusion, Ther extent of diluti\on is
X=5/20ml
X=0.25ml
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Which of the following is not an example of an inexhaustible resource?
1.) Wind power
2.) Wave and tidal power
3.) Solar energy
4.) Biomass
Answer:
I would say 4.) Biomass
Explanation:
This looks like the best possible answer because it is plant based. Worst case scenario we could run out of plants. In comparison, wind will pretty much always be around along with wave/tidal power and solar.
Define, giving examples of
Binary ionic Compound:
Answer:
A binary ionic compound contains an ion that is a metal (cation) and an ion that is a nonmetal (anion).
Explanation:
Tell me if its wrong
2.
The simile in stanza 1 (lines 1-6) helps show the speaker -
wants to learn different languages in order to communicate with others
feels torn between two different worlds that have little in common
wants to go home again and not have to speak or listen to anyone
feels annoyed by having to spend so much time listening to others
The simile in stanza 1 (lines 1-6) shows that the speaker:
"feels torn between two different worlds that have little in common" (Option B)
Why does the speaker feel torn between two different worlds?
She speaker feels torn between two different worlds because the two worlds speak different languages.
It is to be noted that a simile is a figure of speech that compares two different things making use of the word "as".
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An element has 25 protons and 30 neutrons. What is the correct nuclear notation for the element? Please use the Periodic Table to find the correct symbol
Answer:
It is:
55
Mn
25
Magnesium ribbon with a mass of 2g was placed into dilute hydrochloric acid. The
equation for this reaction is:
Mg(s) + 2HCI = MgCl2(aq) + H2(g)
The magnesium ribbon reacted and completely disappeared in 30 seconds. Calculate
he rate of reaction.
The rate of reaction of the magnesium ribbon in the dilute hydrochloric acid is 0.067 g/s.
What is rate of reaction?
Rate of reaction is the rate at which a reaction takes place. It is proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.
Mg(s) + 2HCI = MgCl2(aq) + H2(g)
Rate of reaction = mass of magnesium reacted/time taken
Rate of reaction = 2 g /30 s
Rate of reaction = 0.067 g/s
Thus, the rate of reaction of the magnesium ribbon in the dilute hydrochloric acid is 0.067 g/s.
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By examining electron domain geometry, one can determine that the ammonia molecule (NH3) has
Answer:
The ammonia molecule is a trigonal pyramidal and has 4 sp3 orbitals
Explanation:
Nitrogen has 5 valence electrons, Hydrogen takes up 3 bonds and there's a lone pair on top, and the gemoetry is structured in a way so the hydrogen atoms are facing down away from the lone pair and evenly spaced out between the other hydrogens.
1. Nene geese in Hawaii are endangered because of
O pollution exotic species
O poaching
O habitat destruction
Answer:
✔ habitat destruction
Explanation:
the 3 reasons are:
hunting
habitat loss
introduced predators
summed up its habitat destruction
PLEASE HELP 50 POINTS NO ROBOTS OR I WILL REPORT Which functional group does the molecule below contain?
H
H-C-C
H
H
O A. Ether
O B. Amino
O C. Hydroxyl
• D. Carbonyl
Answer:
D. carbonyl
Explanation:
A C=O group is present, otherwise known as a carbonyl group
How much time would it take for 40000 atoms of sodium-24 (half-life is 15 days) to decay to 2500 atoms?
Answer:
60 days
Explanation:
2500 = 40000 ( 1/2) ^n
n = 4 half lives
4 half lives * 15 days/ halflife = 60 days
betrokke, onthou qrxn = AH en onthou dat "per mol" beteken om te deel.) • In an acid-
base neutralization reaction between 50.0 mL of 0.5 M nitric acid (HNO3) and 50.0
mL of 0.5 M potassium hydroxide (KOH), Arxn was found to be -2500 J. The enthalpy
change (J) per mole of base is therefore ... (Hint: determine the relevant number of
moles of base, remember Arxn = AH and remember that "per mole" means divide.)
The enthalpy tell us about the heat that may be absorbed or evolved in a reaction. The ethalpy of this reaction is -100 kJ/mol.
What is enthalpy?The term enthalpy deals with the heat that is absorbed or emitted in a reaction. The reaction equation is; HNO3 + KOH ----> KNO3 + H2O
Number of moles of HNO3 = 0.5 M * 50/1000 L = 0.025 moles
Number of moles of KOH= 0.5 M * 50/1000 L = 0.025 moles
Since the reaction is 1:1, then heat evolved = - (2500 J * 10^-3)/0.025 moles
= -100 kJ/mol
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Section 1
1. The Florida scrub jay is a bird found only in the scrub habitat of Central Florida. Efforts are being ma
in Florida to preserve the scrub habitat by limiting development by humans and maintaining natural
conditions. Which may occur over time if the Florida scrub habitat is NOT preserved? (SC.5. L.15.1)
A. The scrub jays may become extinct.
B. The scrub jays may move to live in a coastal habitat.
C. The scrub jays may learn to live in any habitat that replaces the scrub habitat. X
D. The scrub jays may have offspring with changed features to match a new habitat.
Answer:
i belive it is A
Explanation:
well if it olny lives in those scrub habitats and the habitats get desroyed or polluted they will no longer be habitable there fore causeing the scrub jay to go exctinct.
What percentage of Americans believes that humans are causing global warming?
10
24
68
93
Answer:
49% say human activitiy contributes global warming.
Answer:
The answer is 68%
Explanation:
including me :)
Some landforms you might see while traveling across the country could be
mountains
forests
hills
rivers
glaciers
Answer:
Mountains, Hills and Rivers
Explanation:
Because I read it and I already know that
Hope that helps!
Answer:
Mountains, Hills and Rivers
Explanation:
What type of reaction is this?
Na(s) + O2(g)
Answer:
Combustion. It is combustion since we assume that it is in a rigid container and Na reacts with oxygen gas
How many grams of a gas with a molar mass 36.02 g/mol would be required to occupy a 3979 mL flask at 1.07 atm and 81.7 degrees Celcius? Record your answer in scientific notation to 2 decimal spaces.
A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.
What is an ideal gas?An ideal gas is that whose behavior can be explained using the ideal gas laws.
Step 1. Convert 81.7 °C to Kelvin.We will use the following expression.
K = °C + 273.15 = 81.7 + 273.15 = 354.9 K
Step 2. Calculate the moles of the gas.We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.07 atm × 3.979 L / (0.08206 atm.L/mol.K) × 354.9 K = 0.146 mol
Step 3. Calculate the mass of the gas.The molar mass of the gas is 36.02 g/mol.
0.146 mol × 36.02 g/mol = 5.26 g
A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.
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chemistry question, 20 points, will mark as brainliest if correct:
Answer:
CS2 + 3O2 -> CO2 + 2SO2
Explanation:
What is the pH of a 0.0170 M solution of HI?
Answer:
To solve the problem, enter the concentration of the hydrogen ion. The pH of a 0.025 M solution of Hydrobromic Acid is 1.602.
What is the pH of a 0.050 M LiOH solution?
Answer:
a. <1.0
b. 1.30
c. 3.00
d. 11.00
e. 12.70
A manufacturer advertises that a particular brand of lotion is “pH balanced” and that it has a pH equal to 6.25. What can you infer about the lotion based on the information in the ad?
We can infer about the given information of lotion is that pH is slightly acidic in nature.
What is pH?pH of any solution gives idea about the acidity or basicity of that solution, and it will be calculated as:
pH = -log[H⁺]
pH value in the range of 0 to 6.9 shows acidity, 7 shows the neutral nature and from 7.1 to 14 shows basicity. Given pH value of lotion i.e. 6.25 states that lotion is slightly acidic in nature.
Hence pH value of lotion informs that lotion is slightly acidic.
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How many oxygen atom in 0.25 mol ca(No3)2
Answer: I believe its 1 but i'm not sure
Explanation:
What is the volume occupied by 11 grams of NO2(g) at STP?
Please Help I don’t understand
The volume of gas occupied by 11 grams of nitrogen dioxide gas at STP is 5.15 L.
What is the ideal gas equation?Ideal gas equation of any gas will be writen as:
PV = nRT, where
P = standard pressure = 1 atm
V = volume = ?
R = universal gas constant = 0.082 L.atm/K.mol
T = standard temperature = 273K
n is the moles of gas which can be calculated by using below equation as:
n = W/M, where
W = given mass = 11g
M = molar mass = 46 g/mol
n = 11 / 46 = 0.239mol
On putting values on the above equation, we get
V = (0.23)(0.082)(273) / (1) = 5.15 L
Hence required volume of gas is 5.15 L.
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HELP ME OUT PLS!!!!!!!
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is which type of galaxy?
elliptical
irregular
spiral
oval
Answer:
the spiral type of galaxy
Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.
What is milky way galaxy?The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.
A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.
Therefore, the correct option is option C.
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