Answer:
the abundance of non-native plants. this MAY be right.
Explanation:
i thought it would be an increase in pollution.
the answer to 54.34g-45.6g has how many significant figures
how many molecules are in 85.4 grams of Li2SO4
Answer:
85.4
Explanation:
what are levers used for? (science)
According to the research, levers are used to modify or generate a force and transmit displacement.
What are levers?It is a simple machine composed of a rigid bar of some moderately resistant material, which rotates freely on a support point.
It can be used to maximize the mechanical force applied to an object, increasing its speed or the distance it travels, by applying a proportionally smaller amount of force.
Therefore, we can conclude that according to the research, levers are used to modify or generate a force and transmit displacement.
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Determine the molarity of a solution with a volume of 437. mL and 0.590 mol of
solute dissolved.
Answer:
Answer:
= 1.35M
Explanation:
data:
volume = 437ml
= 437 /1000
= 0.437dm^3
no. of moles = 0.590 moles
solution:
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.590 / 0.437
molarity = 1.35M
HBr + H,SO, - SO, + Br, + H,O
Did S change oxidation number?
Answer:
I think the answer might be yes..
Question 8 (1 point)
A lead sinker is used in fishing to weight a fishing line down. If 149.4 J of heat energy
J
was added to a lead sinker with a mass of 50 g. What is the total temperature change
for the lead sinker? Assume the specific heat (c) of lead is 0.129 J/gºC.
888
Answer:
do u like fishing
Explanation:
because i do
Answer:
23.2 C
Explanation:
By looking at the dimension of specific heat ( J/g-C) , you can compute these type of questions:
149.4 J / ( .129 J / g-C * 50 g) = 23.2 C
(see how dimensions g and J cancel out and you are left with C ? )
name the three crystalline forms of carbon
Answer:
Diamond.
Graphite.
Fullerene
Explanation:
these are three crystalline forms of carbon.
A 150.0 mg block at 22.5⁰C has a volume of 5,382 cm³.
Which answer choice represents BOTH the correct temperature of the block in Kelvin AND the correct density of the block in g/cm³?
72.5 ⁰K; 2.78 x 10⁻⁵ g/cm³
296 ⁰K; 3.59 x 10⁴ g/cm³
-250 ⁰K; 3.59 x 10⁻⁴ g/cm³
296 ⁰K; 2.78 x 10⁻⁵ g/cm³
Density is the ratio of mass and volume. The temperature in kelvin is 296 kelvin and the density of the block is 2.78 x 10⁻⁵ g/cm³. Thus, option D is correct.
What is density?Density is the gms of the substance present in a cubic centimeter of volume. It is calculated in g/ cm³.
Given,
Mass of the block = 150.0 mg
Volume = 5382 cm³
Density is calculated as:
D = Mass ÷ volume
= 0.15 gm ÷ 5382 cm³
= 2.78 × 10⁻⁵ gm/ cm³
Temperature from Celsius to kelvin is converted as:
0°C + 273.15 = 273.15K
22.5 + 273.15 = 295.65 Kelvin
Therefore, option D. 296⁰K; 2.78 x 10⁻⁵ g/cm³ is correct.
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kilometre is a multiple of metre why
During which of the following 50-year intervals has the world's population increased the most? O A. 1850-1900 O B. 1800-1850 O C. 1900-1950 O D. 1950-2000
Answer:1950-200
Explanation:
During 1950-2000 of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.
What is population?The whole number of people or inhabitants in a country or region.
The world's population increased from 2.5 billion in 1950 to around 7.3 billion in 2015 and is expected to continue to rise until 2050/2100 under most UN.
During 1950-2000 of the following 50-year intervals has the world's population increased the most. Hence, option D is correct.
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A 1.5 kg rock and a 15 kg book are dropped from rest from the same
height at the same time. In the absence of air resistance, which one will
hit the ground first?
These three gases, Helium, Neon, and Argon all have one property in common because they are gases at room temperature. That is they:
They have no definite shape and no definite volume because they are gases.
How gases have no definite and volume?Gases have no definite shape and no definite volume because they are present in free state. Those substances that are close together and held tightly have definite shape and volume.
So we can conclude that they have no definite shape and no definite volume because they are gases.
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2KCIO3 -> 2KCI + 302
For the reaction shown here, calculate how many moles of reactants are needed to produce 96 grams of oxygen gas as a product.
A) 1
B) 2
C) 3
D) 4
Moles of oxygen
Given mass/molar mass96/323mol2 mol reactants required for 3mol O_2
So our answer is 2
dictwbdjdiucgahsuxijsjaashduhsh
Answer:
stroke
Explanation:
In an aqueous solution all ions are present. Some of these ions will react, however, some will not. The ions that do not
react in solution are called
a. Inert ions
B. Spectator ions
C. Cations
d. Anions
Answer:
B. Spectator ions
Explanation:
Spectator ions are described as spectators literally because they "spectate", or, in other words, do not participate in the overall reaction. They may show up in the reaction equation, but they don't react themselves.
Thus, spectator ions stay unchanged throughout a reaction. We see many spectator ions in precipitation reactions. Remember that ionic compounds disassociate in solution.
For example, the reaction between silver nitrate [tex]AgNO_{3}[/tex] and sodium chloride [tex]NaCl[/tex] produces a solid precipitate of silver chloride [tex]AgCl[/tex] as represented by the equation below:
[tex]Ag^+_{(aq)} + NO^-_{3(aq)}+Na^+_{(aq)}+Cl^-_{(aq)}[/tex] -------> [tex]AgCl_{(s)}+Na^+_{(aq)}+NO_{3(aq)}^-[/tex]
However, the sodium and nitrate ions remained aqueous, like before, so they did not react. Thus, they are spectator ions.
Hydrazine (N₂H₄), a rocket fuel, reacts with oxygen to form nitrogen gas and water vapor. The reaction is represented with the equation:
N₂H₄(I) + O₂(g) --->N₂(g) + 2H₂O(g)
At STP, if 4.20L of O₂ reacts with N₂H₄, how many liters of water vapor will be produced?
At STP one mol weighs 22.4L
Moles of O_2
4.2/22.42.1/11.20.19mol1 mol.O_2 can create 2mol water
moles of water
2(0.19)0.38molVolume of water
0.38(22.4)8.512LAnswer:
The given equation is:
N2H4(l) + O2(g) → N2(g) + 2H2O(g)
From the periodic table:
mass of nitrogen = 14 gramsmass of hydrogen = 1 grammass of oxygen = 16 gramsTherefore:
molar mass of N2H4 = 2(14) + 4(1) = 32 grams
mass of water = 2(1) + 16 = 18 grams
From the balanced equation:
1 moles of N2H4 produces 2 moles of H2O.
32 grams of N2H4 produce 18*2=36 grams of water
To know the mass of N2H4 needed to produce 96 grams of water, all you need to do is cross multiplication as follows:
mass of N2H4 = (96*32) / 36 = 85.3334 gramsUsing the chemical formula CaO + 2 NaCl → Na2O + CaCl2, calculate how many moles of CaCl2 you would produce if you used up 5.4 moles of CaO?
Answer:
5.4 moles CaO 1 mole CaCl₂ 5.4 mole CaCl₂
1 mole CaO
Explanation:
How is light used in our daily activities?
Answer:
that is your answer hope this helps u
A can of soda gets left in the car on a hot summer day. When the can was placed in the car it had an internal temperature of 10
and pressure of 2.07 atm. If the can heats up to 47.6 what will the pressure inside the can be? Remember to convert to Kelvin! (Report your answers to 2 decimal places)
Answer:
2.35 atm
Explanation:
According to the Ideal Gas Equation,
P₁/T₁ = P₂/T₂Here :
P₁ = 2.07 atmT₁ = 10 °C = 283 KT₂ = 47.6 °C = 320.6 KSolving :
P₂ = P₁T₂/T₁P₂ = 2.07 x 320.6 / 283P₂ = 663.642/283P₂ = 2.35 atm (rounded to 2 DP)Substances that cause the oxidation of other substances are
a, reducing agents,
b. oxidizing agents,
c. catalysts.
d. cells.
==============================
[tex]\large \sf\underline{Question:}[/tex]
Substances that cause the oxidation of other substances are;==============================
[tex]\large \sf\underline{Answer:}[/tex]
[tex] \qquad \qquad \huge \bold{Option \: B}[/tex]
==============================
[tex]\large \sf\underline{Explanation:}[/tex]
Substances that cause the oxidation of other substances are oxidizing agents.==============================
what is the number of moles in 71g H20
The number of moles in 72 gram H₂O is 3.942 MOL.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
First, know the molar mass of water.
The given mass is 71 gram
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{71}{18.01}= 3.942 mol[/tex]
Thus, the number of moles in 72 gram H₂O is 3.942 MOL.
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2. An industrial process wastewater contains a mixture of metal fragments and sand. The metal fragments range in diameter from 0.5 to 10 mm with a specific gravity of 1.65. The sand particles range in diameter from 0.04 to 2.0 mm with a specific gravity of 2.65. The wastewater discharge rate is 1400 m3/d at 20°C. Design a settling tank to remove all the metal and sand particles. If the depth of the tank is 2 m, calculate the detention time. Solution Given
The detection time when an industrial process wastewater contains a mixture of metal fragments and sand is 1392.8 seconds.
How to calculate the detection time?From the information regarding the industrial process wastewater, the settling velocity for the sand particles will be:
= 9.81/[18(1.002 × 10^-6] × (2.65 - 1) × (0.04 × 10^-³)²
= 0.001435
Therefore, the detection time will be:
t = 2/0.001435
t = 1392.8 seconds.
The detection time is 1392.8 seconds.
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What mass of H₂ is required to produce 2 moles of NH3?
Answer: RATIOS IN TERMS OF MOLES
Solution: Solution According to the balanced equation, 2 moles of NH3 are produced when 3 moles of H2 react.
When a fuel is burned, energy is released. Where do you think that energy comes from?
The energy comes from the sun, captured through photosynthesis.
PLEASE HURRY What is one technology that has contributed to human population growth in the past that could hinder it in the future? How will this happen?
Answer:
Factories because they have helped with producing goods faster but in the meanwhile, our future will slowly get warmer.
Explanation:
4. Which of the following involves the largest consumption of fresh water resources?
a. Recreational purposes by humans
b. Agricultural processes
c. Drinking purposes by humans
d. Industrial processes
Nitrogen gas was collected by water displacement. What was pressure of the N, collected if the temperature was 22 °C?
The pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
What is atmospheric pressure?
The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.
Atmospheric pressure = 101.325 kPa
Vapor pressure of water at 22°C = 2.6427 kPa
Pressure of N₂ = (Atmospheric pressure) - (vapour pressure of water at 22°C)
Pressure of N₂ = (101.325 kPa) - ( 2.6427 kPa)
Pressure of N₂ = 98.6823 kPa
Therefore, the pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.
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how many moles of o2 are needed to produce 34.7g of fe203
Answer:
5.09 moles of Fe is required to react with 3.82 moles of O₂.
0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Reaction stoichiometry
In first place, the balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe: 4 moles
O₂: 3 moles
Fe₂O₃: 2 moles
The molar mass of the compounds is:
Fe: 55.85 g/mole
O₂: 32 g/mole
Fe₂O₃: 159.7 g/mole
Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe: 4 moles ×55.85 g/mole= 223.4 grams
O₂: 3 moles ×32 g/mole= 96 grams
Fe₂O₃: 2 moles ×159.7 g/mole= 319.3 grams
Moles of Fe needed
The following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ react with 4 moles of Fe, 3.82 moles of O₂ react with how many moles of Fe?
moles of Fe= 5.09 moles
Finally, 5.09 moles of Fe is required to react with 3.82 moles of O₂.
Moles of O₂ needed
The following rules of three can be applied: If by reaction stoichiometry 319.3 grams of Fe₂O₃ are formed from 3 moles of O₂, 34.7 grams of Fe₂O₃ are formed from how many moles of O₂?
moles of O₂= 0.326 moles
Finally, 0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Explanation:
Which reason explains why the boiling point of water (H2O) is higher than the boiling point of hydrogen sulfide(H2S)
Options:
Ionic bonding
Covalent bonding
Hydrogen bonding
London dispersion forced
Which statement correctly describes 1 mole of iodine (I₂)
A) its mass is 126.9g
B) its mass is 380.7 g
C) it contains 6.02*10^23 atoms
D)it contains 6.02*10^23 molecules
Answer:
It contains 6.02*10^23 molecules
Explanation:
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