Answer:
702000
Explanation:
(2 x 10^3) + (7 x 10^5)
=> 2 x 1000 + 7 x 100000
=> 2000 + 700000
=> 702000
In calorimetry, energy is measured through heat transfer from one substance to
another. Which of the following is NOT a method of heat transfer?
Answer:
Refraction
Explanation:
A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl from the reagent shelf using a graduated cylinder to obtain approximately 0.6 M HCl. This solution was titrated with the original NaOH solution. The student calculated the concentration of NaOH from the experiment to be 0.099 M. In which experiment should the student be more confident of the concentration of the NaOH solution
Answer:
Following are the solution to the given question:
Explanation:
Each method through KHP is somewhat more precise since we have weighed that requisite quantity, we exactly know the KHP intensity appropriately. Its initial 6 M HCl concentration was never considered mandatory. They have probably prepared 6 M HCl solution although long ago and could have changed its concentration over even a period.
if 6.2 mold of H2SO4 is dissolved to make 750 ml of sulfuric acid what is the molarity
Answer: The molarity of given solution is 8.26 M.
Explanation:
Given: No. of moles = 6.2 mol
Volume = 750 mL (1 mL = 0.001 L) = 0.75 L
Molarity is the number of moles of a substance present in a liter of solution.
Therefore, molarity of given solution is converted as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{6.2 mol}{0.75 L}\\= 8.26 M[/tex]
Thus, we can conclude that the molarity of given solution is 8.26 M.
Cu+k.HNO3 --> Cu(No3)2+..........+...........
Answer:
Cu + HNO3 → Cu(NO3)2 + H2O + NO2
Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 (balanced equation)
Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
the doge has the answer
Pb(NO3)4
What is the pH of a 0.235 M Ba(OH)2 solution?
Answer:
13.672
Explanation:
2 moles of OH in Ba(OH)₂
0.235 M × 2 mol OH = 0.47 M OH
pOH = -log[OH-] ; pOH = -log[0.47 M OH] ; 0.328 = pOH (consider significant figures)
14 - pOH = pH because pH + pOH = 14
14 - 0.328 = 13.672 [there are three decimal places after the OH concentration, so there should be in the answer as well - 13.672]
Diamond is the hardest mineral according to Mohs Hardness Scale having a hardness scale reading of 1. True or false ? if you get it right ill make u brainliest also ill give all points !
What is the volume of a balloon if it contains 3.2 moles of helium at a temperature of 20. °C and standard pressure?
Answer:
1.14 mol
Explanation:
The concept ideal gas law can be used here to determine the volume of the balloon. The volume of the balloon is 76.97 L.
What is ideal gas law?The combination of Boyle's law, Charles's law and Avogadro's law leads to an equation which gives the combined effect of change of temperature and pressure on the volume of a gas.
According to Boyle's law, V ∝ 1/P
According to Charles's law, V ∝ T
According to Avogadro's law, V ∝ n
On combining all these equations, the ideal gas equation is given as:
PV = nRT
P - Pressure
V - Volume
n - Number of moles
R - Universal Gas constant
T - Temperature
Here the standard pressure is 1 atm
20°C = 20 + 273 = 293 K
V = nRT / P
3.2 × 0.0821 × 293 / 1
= 76.97 L
Thus the volume of balloon is 76.97 L.
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Which of the following would be considered an Exothermic Reaction?*
Ice Melting
Burning wood
Boiling water
Baking a cake
Answer:
Burning wood
Explanation:
the fire releases heat into the air from the burning wood
0.850 moles of N2 originally at 85°C is cooled such that it now occupies 17.55L at 1.25 atm. What is the final temperature of the gas?
The final temperature of the gas is 269.9 K, or -3.25 °C, which was calculated with the help of ideal gas equation.
What is the ideal gas equation?The ideal gas equation gives the relation between pressure, volume and temperature.
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
To find the initial volume of the gas. We can use the fact that the number of moles of gas does not change during the cooling process:
n = 0.850 moles
We can also use the ideal gas law to find the initial volume of the gas:
PV = nRT
V = nRT/P
where R = 0.08206 L atm/K mol is the gas constant.
Convert the initial temperature from Celsius to Kelvin:
T1 = 85 °C + 273.15 = 358.15 K
Substitute the given values into the equation:
V₁ = (0.850 mol)(0.08206 L atm/K mol)(358.15 K)/(1 atm) = 24.03 L
Now we can use the combined gas law to find the final temperature:
(P₁V₁/T₁) = (P₂V₂/T₂)
Substitute the given values into the equation:
(1.25 atm)(24.03 L)/(358.15 K) = (P₂) (17.55 L)/(T2)
Solve for T₂:
T₂ = (P₂)(17.55 L)(358.15 K)/(1.25 atm)(24.03 L)
T₂ = 269.9 K
Therefore, the final temperature of the gas is 269.9 K, or -3.25 °C.
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A. If the mass of Hydrogen is 1 amu, what is the mass of Hydrogen in the reactant side of the equation above?
B. what is the mass of Hydrogen on the product side of the equation above?
Answer:
there are 4 hydrogen so
A.the mass of Hydrogen in the reactant side of the equation above is 1×4=4 amu.
B.the mass of Hydrogen on the product side of the equation above =1×4=4 amu.
Note: mass of reactant =mass of product.
Convert 7.8 moles of carbon tetrafluoride into grams.
Answer:
686.43363984 is the answer when 7.8 moles is converted.
How many moles of KI are present in 0.85L of a 0.55 M KI solution?
Answer: Amount of moles is 0.47 mol
Explanation: Amount of moles n = cV = 0.55 M · 0.85 l = 0.4675 mol
There are 0.4675 moles of KI in 0.85L of a 0.55 M KI solution
WHAT IS MOLARITY?
Molarity is a measure of the concentration of a solution. It is calculated by dividing the number of moles (n) of a solute by the volume of a solution (V)
Molarity = number of moles (n) ÷ volume (V)
According to this question, the molarity of a KI solution with a volume of 0.85L is 0.55 M. Hence, the number of moles of KI in the solution can be calculated as follows:
Molarity = n/V
0.55 = n/0.85
n = 0.55 × 0.85
n = 0.4675 moles
Therefore, there are 0.4675 moles of KI in 0.85L of a 0.55 M KI solution.
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Use the drop-down menus to answer the questions about fronts and weather maps.
Cold fronts appear on weather maps in areas of .
Warm fronts appear on weather maps in areas of .
Answer:
Large temperature and air pressure decrease.
Temperature and air pressure increase.
Explanation:
The correct options about fonts and weather maps are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
What is a cold front and warm front?Similar to a cold front, there is usually a noticeable temperature change from one side of the warm front to the other.
A cold front occurs when colder air replaces warmer air, while a warm front occurs when warmer air replaces cold air.
Thus, the correct options are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
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The volume of 3.73 moles of a gas is 78.3 L at a certain temperature and pressure. At the same temperature and pressure, the moles of gas
that occupies 33.3 L is
Explanation:
) If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? P PV = nRT. 5.6 (12)=460821) T.
Explain the term orbital.
Answer: a mathematical expression describing the probability of finding an electron at various locations; usually represented by the region of space around the nucleus where there is a high probability of finding an electron
Explanation:
What is the relative humidity of the air when the dry-bulb temperature is 4°C and the dewpoint is -4°C?
1.
42%
2.
46%
3
51%
4
56%
Answer:56%
Explanation:
In the dewpoint chart when you line it up it ends up at 56%
The relative humidity of the air when the dry temperature is about 4 degrees and the dew point is about -4 degrees C is 56%. Hence option 4 is correct.
What is dewpoint?The dew point is the temperature at which the air needs to be colled at a ta constant pressure in order to have an RH of 100%. The dew point is minus four degrees and the RH of the air is 4 degrees.
For the forces to initiate the air must get cooler and a constant addition of water pressure should be there. Thus substrating the temperature of the wet bulb, putting the thermometer on the dry bulb, and making use of the RH chart tells us that RH is 56%
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PLEASE HELP! (8.01 MC)
What is capillary action? Describe how capillary action shown by water is useful for
plants and animals on Earth. (8 points)
Capillary action help the root of plant to absorb water from the soil and help animals to bring water.
What is capillary action?Capillary action is the process by which water flow and passed through a narrow space without the help of an opposition or any form of external forces like gravity.
Therefore, Capillary action help the root of plant to absorb water from the soil and help animals to bring water.
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explain why hydrogen chloride does not conduct electricity, but a solution of hydrogen chloride and water conduct electricity
When two substances at room temperature are combined, the product feels HOT. What
kind of reaction is this?
Answer:
The correct answer is - exothermic reaction.
Explanation:
Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.
In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.
Why does 50 g of copper require less heat (q) than 50 g of water, in order to raise the temperature by 15 oC? (Hint - the heat capacity may play a role, but how?)
Answer:
See Explanation
Explanation:
Specific heat capacity is an intensive physical property of matter. It is a measure of the quantity of heat that must be supplied in order to change the temperature of a unit mass of a substance by 1°C.
The specific heat capacity of a substance determines the quantity of heat that must be supplied in order to effect a temperature change of a unit mass of a substance. The higher the specific heat capacity of a substance, the greater the quantity of heat required to effect a temperature change in a given mass of the substance.
The specific heat capacity of water is 4,200 Joules per kilogram while the specific heat capacity of copper is 385 Joules per kilogram. Hence, the heat capacity of water is far greater than that of copper and consequently, 50 g of copper require less heat (q) than 50 g of water, in order to raise the temperature by 15 oC.
The equivalence point of a titration corresponds to which of the following?
O the point where equal volumes of acid and base have been used
O Equivalence point is another term for end point
All of the listed options are true
Equivalence point is defined as the point where the pH indicator changes color
O the point where the acid and base have been added in proper stoichiometric amounts
Answer:
E: the point where the acid and base have been added in proper stoichiometric amounts
Explanation:
Equivalence point in titration is simply the point where the amounts of acid and base used just sufficiently reacts chemically to cause neutralization whereas the endpoint is the point where the indicator of the titration changes colour.
The Equivalence point occurs before the endpoint.
Thus, option E is correct.
Determine the pH of 1.0 x 10-10M NaOH
pH=
Answer:
4
Explanation:
Applying,
pH = 14-pOH.................... Equation 1
But,
pOH = -log(OH⁻)
Where OH⁻ = Hydroxyl ion concentration of NaOH.
From the question,
Given: OH⁻ = (1×10⁻¹⁰) M
Substitute these values into equation 1
pH = 14-log((1×10⁻¹⁰)
pH = 14-10
pH = 4
Hence the pH of NaOH with a molarity of 1.0 x 10-10M = 4
How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
Calculate how many grams of methane (CH4) are in a sealed 800. mL flask at room temperature (22 °C) and 780. mm of pressure. Show work pls.
"0.0340" mol of CH₄ are in sealed flask.
Methane (CH₄)Methane would also be a greenhouse gas, therefore its existence tends to affect humanity's surface temp as well as weather patterns framework; it is released into the atmosphere from such a wide assortment of life forms as well as biogenic.
According to the question,
Volume, V = 800 mL or, 0.800 L
Temperature, T = 22°C or, 295
Pressure, P = [tex]\frac{780}{760}[/tex] = 1.03 atm
As we know the relation,
The gram of moles will be will be:
→ n = [tex]\frac{PV}{RT}[/tex]
By substituting the values, we get
= [tex]\frac{1.03\times 0.800}{0.08206\times 295}[/tex]
= [tex]\frac{0.824}{242.077}[/tex]
= 0.0340
Thus the response above is correct.
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Question 6 (4 points)
(08.02 MC)
What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? (4 points)
а
26.596
D
20.946
с
18.296
d
16.796
Answer:
20.9%
Explanation:
I took the test i hope this helps:)
The percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%. This is calculated using the definition (formula) of percentage by mass of a solution.
What is meant by percentage by mass?The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
The formula for percentage by mass is given as
percentage by mass = (mass of the solute/ total mass of the compound solution) × 100
Calculating percentage by mass for the given solution:The mass of the solute ( the chemical which is going to be dissolved) HCl
= 27.0 grams
The mass of the solvent (the substance in which a solute dissolve) water
= 102.0 grams
So, the total mass of the solution = 27.0 + 102.0 = 129.0 grams
Then, the percentage by mass = [tex]\frac{27.0}{129.0}[/tex] × 100 = 20.93%
Which is approximate equal to 20.946 at option B.
Therefore, the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%.
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True or False. And please show your work!
false I think? I could be wrong
How many ions will CaBr2 dissociate to in solution?
-cannot be determined
-3
-2
-0
Answer:
3.
Explanation:
Hello there!
In this case, according to the definition of ionic bonds, whereby the cations give away their initial valence electrons to the anions, we infer that ionic species calcium bromide has three ions, one calcium ion and two bromide ions, and therefore the answer is 3.
Regards!
A solution has a concentration of 4.55x10^-2 H+ ions what is the pH
Answer:
1.34
Explanation:
PH can be calculated by taking the negative logarithm to the base ten of the hydrogen ion concentration
Robert Hooke observed a slice of cork under a microscope. He saw what looked like “pores” or “cells” in it. Hooke can assume that the cork is most likely - Answer F A man made material G A type of living organism H A type of mineral J A petroleum based product
The cork oak tree from which cork is extracted is native to southwest europe and northwest africa. Cork is extracted from cork oak trees without harming the tree. So cork is a type of mineral. The correct option is C.
What is a cork cell?The dead cells without having intercellular spaces are defined as the cork cells. They appear at the periphery of roots and stems when they grow older and increase in girth. They also have a chemical called suberin in their walls.
It is the suberin which makes them impervious to gases and water. The outer protective coat of a tree is called the cork. It is one of the components of bark of the tree. The tissues of bark become old and the secondary mersitem replaces them.
Cork is made up of multiple thick layers and it protects the tree from bacterial or fungal infection.
Thus the correct option is C.
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