Answer:
Oxygen is one of the most abundant elements on Earth. Oxygen accounts for 20.9% of the atmosphere, 45% of the Earth's crust (as oxide minerals) and also accounts for almost all of the mass of water on Earth (89%). It is found in a huge number of natural minerals including sulfates, phosphates, carbonates and oxides.
Explanation:
Hope this helps
Balance the three equations below by adding the coefficient next to the element(s).
Cr2O3 + 3Mg —> __Cr + 3MgO
__H2 + 1O2 —> 2H2O
2 NaBr + Cl2 —> __NaCl + Br2
Answer:
2Cr
2H2
2NaCl
Explanation:
What two methods brings conductivity to semiconductors?
Write the balanced equation for the ionization of the weak base pyridine, c5h5n , in water, h2o. Phases are optional.
The balanced equation for the ionization of the weak base pyridine,C5H5N in water, H2O
C_5H_5N ( aq.) + H2O ( l) ---------> C5H5NH+ (aq.) + OH- (aq.)
What is the balanced equation for the ionization?Generally, Pyridine is characterized by a ring structure, in this characteristic ring structure N is sp2 hybridized, hence creating a lone pair present on N so s - character is more, as well as lone pair, is present.
Therefore, Considering The following functions of the equation:weak base pyridine,C5H5N in water, H2O
We write the balanced equation for the ionization as
C_5H_5N ( aq.) + H2O ( l) ---------> C5H5NH+ (aq.) + OH- (aq.)
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Please help! Choose one of the chemical reactions seen in the images on the last activity 1. Explain what happens in terms of energy/ enthalpy change. 2. Is AH negative or positive? The reaction choices are Fire, Photosynthesis, condensation, cokking an egg, or melting ice you can choose any one.
Answer:
there's no images we need pictures
An entire, intact organism may be preserved in ____ and ____. A. imprints; petrified B. amber ; ice C. casts; trace fossils D. molds , cast
letter B
Explanation:
An entire, intact organism may be
preserved in amber and ice
PLEASE JUST PLEASEEE ANSWER THEM PLSSSS!!! I can’t fail bro plsss
Explanation:
K = °C + 273
1. -234 + 273 = 39K
2. 84 + 273 = 357K
3. 70 + 273 = 343K
4. -24 + 273 = 249K
5. 134 + 273 = 407K
6. 120 + 273 = 393K
-234 °C = 39K
84 °C = 357K
70 °C = 343K
-24 °C = 249K
134 °C = 407K
120 °C = 393K
Answer:
-234°C = 39K
84°C = 357K
70°C = 343K
-24°C = 249K
134°C = 407K
120°C = 393K
Explanation:
Hope it helps:)
Type the correct answer in the box. Express your answer to three significant figures. Calcium nitrate reacts with sodium phosphate to form sodium nitrate and calcium phosphate. Given 96. 1 grams of calcium nitrate, what’s the theoretical yield of calcium phosphate? Use the periodic table and the polyatomic ion resource. The mass of calcium phosphate the reaction can produce is grams.
6.07 grams is the theoretical yield of calcium phosphate (Ca₃(PO₄)₂).
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M= molar mass
Given chemical reaction is:
3Ca(NO₃)₂ + 2Na₃PO₄ → 6NaNO₃ + Ca₃(PO₄)₂
From the stoichiometry it is clear that:
3 moles of Ca(NO₃)₂ = produce 1 mole of Ca₃(PO₄)₂
Given mass of Ca(NO₃)₂ = 96.1g
Mole of Ca(NO₃)₂ = 96.1g/164g/mol = 0.5859moles
So, 0.5859 moles of Ca(NO₃)₂ = produce 0.5859×1/3 = 0.0196 moles of Ca₃(PO₄)₂
Required mass of Ca₃(PO₄)₂ will be calculated by using moles as:
W = 0.0196mole × 310g/mole = 6.07 grams
Hence, 6.07 grams is the theoretical yield of calcium phosphate.
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PLEASE HELP I NEED RIGHT NOW 30 POINTS!!
A boat is at sea, where there are sea currents. The boat uses its engine against the currents and is stationary in the water. If the force generated by the boat to push it forward is 24,000 N, what can be said about the force applied by the current? It is zero.
A: It is zero
B: It is greater than 24,000 N.
C: It is less than 24,000 N and greater than zero.
D: It is exactly 24,000 N.
Answer:
D
Explanation:
according to newtons 3rd law action is accompanied by an equal reaction that is equal in magnitude but opposite in direction so magnitude of force should be same
If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N. Therefore, the correct option is option D.
What is force?A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it's capable of being a push or a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force.
The net force that an object experiences is equivalent to the pace that its momentum varies over time, according to Newton's second law in its original formulation. This equation suggests that an object's acceleration seems inversely proportional to the total force that it experiences if the item's mass remains constant. If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N.
Therefore, the correct option is option D.
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Write the balanced chemical equation for the combustion of docosane C22H46.
Please help!! :(
What evidence supports the hypothensis that dogs might use a magnetic sence to navigate
Answer:
Explanation:
Yes, a new research indicates that dogs might use a magnetic sense to navigate. Dogs has world class nose which helps them to navigate to their destination but it also has a magnetic compass that helps them in navigation. The dogs use magnetic field of the earth to find out shortcut ways in the unknown land or terrain so the hypothesis is right that dogs used magnetic sense for navigation.
10. The hottest stars in the sky are A about 200,000°c B about 5,800°c C about 22.000.
Help this is timed ! help me please
Answer: 22,000 C
Explanation:
Break the numbers apart to make them smaller then multiply and add them back to the big number and there is your answer
Answer:
The hottest known star, WR 102, is one such Wolf-Rayet, sporting a surface temperature more than 35 times hotter than the Sun.
Wolf-Rayet stars come in a variety of flavors.So I'd say B about 5,800°cHope this helps, have an awesome day.A 10 liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C. How many moles of CO2 are in the tank?
The moles of CO2 are in the tank is mathematically given as
n=1.431
What are moles of CO2 are in the tank?Question Parameters:
A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C.
Generally, the equation for the ideal gas is mathematically given as
PV=nRT
Therefore
n=PV/RT
n=354.638kpa*10/8.314 J/mol·K *298k
n=1.431
In conclusion, moles of CO2 is in the tank is
n=1.431
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Please help its urgent
Answer:
C
Explanation:
I picked C because the plant is interacting with the sun which is a nonliving part of the environment.
A, B and D are wrong because seaweed, horses, and trees are living things.
Answer:
C) A plant bending towards the sunlight
Explanation:
A) is incorrect because both the lobster and the seaweed are organisms! Likewise, so are B) and D). D) might seem a little tricky, but ultimately the squirrel is interacting with the tree by living inside it.
A plant bending towards the sunlight, however, is an organism having a response to a factor in its environment.
Which particle has a mass of
9.11 x 10-28 g and charge of -1?
electron
proton
neutron
which of the following is one part of a chemical formula
1. a number that shows the total atomic mass of the substance
2. the full name of each element shown
3. the symbol of each element in the substance
Answer:
3. the symbol of each element in the substance
Explanation:
Pressure is defined as _______.1
Answer:the perpendicular force per unit area
pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
Explanation:
mark me brainliest!!
HCl + CaCO3 → CACl2 + H2O + CO2 balance this equation
Answer:
Balance the equation: CaCO3 + HCl → CaCl2 + H2O + CO2 -
Explanation:
Answer:
2HCl + CaCO3 → CaCl2 + H2O + CO2
That's the balanced equation
Please someone help me ASAP. This assignment is due in 10 min!!
Answer:
Baseball: PE
Satellite: KE
Sky Diver: KE
Basketball: PE
Arrow: KE
Cliff Diver: PE
Swinging Girl: PE
Grasshopper: PE
Bobsled: KE
Slingshot: PE
Explanation:
For a thrown object, KE and PE are in a sort of equilibrium. As the object climbs towards its highest point, it slows down as the initial KE that initiated the movement runs out. At the highest point, it is out of kinetic energy and full of potential energy. Gravity then pulls on the object and causes it to accelerate, thus giving it more KE. The PE at the top of the arc is because at that point, the object has the potential to fall to earth. This is the reasoning behind the baseball, swinging girl, and grasshopper.
This is, in a way, the same reasoning behind the other potential energy cases as well. The basketball, cliff diver, and slingshot are all about to start moving. The first two will be pulled by gravity and the last one will be propelled be the stretchy slingshot material attempting to snap back into place.
All of the KE examples are due to the object or person actively moving towards or around something. This means that they have kinetic energy--the energy of movement!
Answer:
Baseball: Potential Energy
Satellite: Kinetic Energy
Sky Diver: Kinetic Energy
Basketball: Potential Energy
Arrow: Kinetic Energy
Cliff Diver: Potential Energy
Swinging Girl: Potential Energy
Grasshopper: Potential Energy
Bobsled: Kinetic Energy
Slingshot: Potential Energy
Explanation:
Why is better separation of two liquids achieved by slow rather than fast distillation?.
Answer:
A one mL per minute rate (or slower) is recommended for best results in a fractional distillation; simple can go faster. Slow, gradual distillation essentially allows the best equilibration and heat transfer. If you heat too fast, vapors may not condense as quickly as desired, and may waste some of the column.
A gas sample has a volume of 25.0 milliliters at a pressure of 1.00 atmosphere. If the volume increases to 50.0 milliliters and the temperature remains constant, the new pressure will be
Answer:
P2 = 0.5
Explanation:
V1 = 25.0ml (must be convert to L) = 0.025L
P1 = 1.00 atm
V2 = 50.0ml = 0.05L
P2 =?
To calculate this question, must follow this equation below
P1V1 = P2V2
1.00 x 0.025 = P2 x 0.05
0.025 = P2 x 0.05 (divided both sides by 0.05 to left P2)
0.5 = P2
So 0.5 is the answer!
Convert 30.0g NaNO3 to moles
please help
Answer:
0.4moles
Explanation:
1 grams NaNO3 to mol = 0.01177 mol
30 grams NaNO3 to mol = 0.35296330934634 mol
but if we round that up it is 0.4moles
Which of the following best describes the forces when there are different-sized forces from opposite directions acting on an object?
Answer:
it is magnetic force
Explanation:
Magnetic force is the best force when there are different sized forces from opposite direction acting on an o jet it only work when the object is metal like iron nail,aluminium etc
Calculate the volume of 0. 410 moles of hydrogen at 47. 0° C and 1. 20 atm, R=. 0821
Answer:
V = 9
Explanation:
n = 0.410
T = 47.0C (must be convert to K by + 273.15) = 320.15 K
P = 1.20 atm
R = 0.08205
V = ?
To solve this equation, we must follow the equation below:
PV = nRT
1.20 x V = 0.410 x 0.08205 x 320.15 K
1.20 x V = 10.8
V = 9
So the answer is 9.
How noble gases are important for the stability of an atom?
Answer:
they are most stable
Explanation:
due to having maximum number of valence electrons their outer shell can hold.
they rarely react with other elements since they are already stable.
A sample of sulfur dioxide (SO2) is initially at a temperature of 105C, a volume of 15 L, and a pressure of 1.5 atm. If the volume changes to 25 L and the temperature increases to 181C, what is the new pressure? Show your work.
The new pressure is 1.08 atm
Gas lawsFrom the question, we are to determine the new pressure
Using the General gas equation,
[tex]\frac{P_{1}V_{1} }{T_{1}} = \frac{P_{2}V_{2} }{T_{2}}[/tex]
Where
P₁ is the initial pressure V₁ is the initial volumeT₁ is the initial temperature P₂ is the final pressure V₂ is the final volume T₂ is the final temperatureFrom the given information,
P₁ = 1.5 atm
V₁ = 15 L
T₁ = 105 C = 105 + 273.15 = 378.15 K
V₂ = 25 L
T₂ = 181 C = 181 + 273.15 = 454.15 K
P₂ = ?
Putting the parameters into the equation, we get
[tex]\frac{1.5 \times 15}{378.15} = \frac{P_{2} \times 25 }{454.15}[/tex]
[tex]P_{2}= \frac{1.5 \times 15 \times 454.15}{25 \times 378.15}[/tex]
P₂ = 1.08 atm
Hence, the new pressure is 1.08 atm
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Identify important characteristics, chemical properties, physical properties, pH ranges, and examples of acids and bases.
Answer/Explanation:
Acids:
Physical ⇒ Sour Taste, Increases the concentration of hydrogen ions when added to water
Chemical ⇒ Corrosive (Burns your skin and breaks down other materials), Forms hydrogen gas when it comes in contact with a metal, Forms salt and water when added to a base
Example: Tomatoes
Bases:
Physical ⇒ Bitter taste ( Never taste or smell a substance unless your parent/guardian tells you that it is okay), Slippery feeling(never touch a substance unless your parent/guardian tell you that is okay)
Chemical ⇒ Increases the concentration of hydroxide ions when added to water, Forms salt and water when added to an acid
Example: Soap, Clorox
[RevyBreeze]
What is the percentage of oxygen in carbon dioxide (CO2)
Explanation:
carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you get 72.7 g of oxygen.
Which statement is true about molecule speed? (1 point)
a. Faster molecules have more energy than slower molecules.
b: Slower molecules are smaller than faster molecules.
c;Slower molecules are oriented better than faster molecules
d:Faster molecules have fewer collisions than slower molecules.
Faster molecules have fewer collisions than slower molecules is True about molecular speed.
What is Molecular speed?Molecular speed refers to the average distance gases or molecules travelled atca particular time rate.
It is valid in ideal gas, where the molecules do not interact with others.
Average molecular speed = Square root (3 (ideal gas constant) * (Temperature)/m)
Therefore, Faster molecules have fewer collisions than slower molecules is True about molecular speed.
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Ammonia (NH3(g), Delta. Hf = –46. 19 kJ/mol) reacts with hydrogen chloride (HCl(g), Delta. Hf = –92. 30 kJ/mol) to form ammonium chloride (NH4Cl(s), Delta. Hf = –314. 4 kJ/mol) according to this equation: NH3(g) HCl(g) Right arrow. NH4Cl(s) What is Delta. Hrxn for this reaction? kJ.
The change in enthalpy of the given reaction is 175.91 kJ/mol, which shows that reaction is exothermic.
How we calculate ΔH for the reaction?Change in enthalpy for the overall reaction will be calculated as:
ΔH = Enthalpy (H) of the product - Enthalpy (H) of the reactant
Given chemical reaction is:
NH₃(g) + HCl(g) → NH₄Cl
Heat of enthalpy of NH₃ = -46. 19 kJ/mol
Heat of enthalpy of HCl = -92. 30 kJ/mol
Heat of enthalpy of NH₄Cl = -314. 4 kJ/mol
Enthalpy of the reaction is calculated as:
ΔH = -314. 4 - [-46. 19 + (-92. 30)]
ΔH = -314. 4 - (-138.49)
ΔH = -175.91 kJ/mol
Hence, ΔH for the reaction is -175.91 kJ/mol.
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Why is water less dense when it is in a frozen state.
Answer: Your answer is, close to the freezing point, the water molecules start to arrange locally into ice-like structures. This creates some "openness" in the liquid water, which tends to decrease its density.
Hope this helps!