Answer:
[tex]2C _{6}H _{14} + 19O _{2}→12CO _{2} +14H _{2} O[/tex]
. A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation
Answer: The conclusion that best support the observation is that (A CHEMICAL CHANGE took place).
Explanation:
A chemical reaction is defined as the process by which two or more substances, which are often referred to as REACTANTS, combine through bond formation or dissociation of bonds to form new PRODUCTS. In this type of reaction, a CHEMICAL CHANGE occurred because a new substance is formed as a result of the chemical reaction that took place.
There are different characteristics of a reaction which shows that a chemical change has occurred, these includes:
--> Color Change
--> Production of an odor
--> Change of Temperature
--> Evolution of a gas (formation of bubbles)
-- Precipitate (formation of a solid)
From the chemical reaction in the given question, Lithium metals reacts slowly with water to form a colourless solution of lithium hydroxide (LiOH) and hydrogen gas (H2). Here we observe that the buzzing sound of formed gas bubbles shows that a gas was given off. Therefore in conclusion, a CHEMICAL CHANGE took place.
A chemist prepares a solution of silver perchlorate (Agcio) by measuring out 0.91 kg of silver perchlorate into a 400 ml. volumetric flask and filling the flask
to the mark with water
Calculate the concentration in mol L of the chemist's silver perchlorate solution. Be sure your answer has the correct number of significant digits.
Answer:
오빠nsuensojee9ejenheie
Calculate the pH of 1.0 X 10^-4 M HNO3
Answer:
pH = 4
Explanation:
Given that,
The concentration of [H⁺] is [tex]10^{-4}\ M[/tex]
We need to find the pH of the solution. We know that,
[tex]pH=-log[H^+][/tex]
Also,
HNO3 → H+ + NO-3
Put all the values,
[tex]pH=-log[1\times 10^{-4}]\\\\pH=4[/tex]
So, the pH of the solution is equal to 4.
Force is measured in this unit
a. grams
b. m/s
c. newtons
d. m/s/s
Answer:
Force is measured in Newtons, which are units that equal 1 kg * m/sec 2. Force is measured in Newtons, N. Mass is measured in kilograms, kg. The unit that is used to measure force in the SI system of units is the Newton.
Answer is Newtons because I looked it up
hlight
How are rocks weathered as in this example seen here?
ame
aining
22:01
Tools
A)
The rocks change their composition.
B)
The rocks are being chemically weathered by the water.
Freezing and thawing of water breaks the rocks into pieces.
D)
Hot lava is pushing on the rock and breaking it into pieces.
Answer:
B). The rocks are being chemically weathered by the water.
Explanation:
Because the water is slowly destroying the rock
A piece of metal weighing 59.047 g was heated to 85.2°C and then put into 100.000 g of
water at 23.7°C. The metal and water were allowed to come to an equilibrium
temperature of 24.8°C. Calculate specific heat of the metal. Show work please.
HELP PLEASE!!!!!
What is the molarity of a solution prepared by dissolving 30.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters? (5 points)
0.150 M NaOH
0.218 M NaOH
0.313 M NaOH
0.462 M NaOH
Answer:
0.313 M NaOH
Explanation:
Got it right on the test.
Taking into account the definition of molarity, the molarity of the solution is 0.313 M.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
This caseIn this case, you know:
number of moles= 30 grams×[tex]\frac{1 mole}{40 grams}[/tex]= 0.75 moles (being 40 [tex]\frac{grams}{mole}[/tex] the molar mass of NaOH)volume= 2.40 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.75 moles}{2.40 L}[/tex]
Solving:
molarity= 0.313 M
Finally, the molarity of the solution is 0.313 M.
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Which of the following are acid formulas? (Choose 2)
NH3
CH3OH
NaOH
HNO3
H2SO4
CH4
Answer:
HNO3 & H2SO4
Explanation:
HNO3 is Nitric acid and H2SO4 is Sulphuric acid
2.
The atoms that make up nitrogen gas...
N2
A share two covalent bonds.
B. have a definite shape.
1
C. share a pair of neutrons.
D. have two free electrons.
Answer:
A they share two covalent bonds
How many ml of a 6.00M HNO would be required to prepare 200ml of a 2.50M
solution?
83.33ml
72.98ml
86.23ml
64.98ml
Answer:
83.33ml
Explanation:
Firstly, let's notice that 200ml are equal to 0.2L
M=number of moles of the solute ÷ number of liters. Let's call the number of liter by x:
2.5=x÷0.2
x=2.5×0.2
x=0.5
It means you'll need 0.5 mol of HNO. But your solution have 6 moles per liter, so how much do you need? Divide the moles by 12 to have 0.5, so now you need to divide the liter per 12 too. The liter is equal to 1000ml, so:
1000ml÷12=83.33ml
Why does the rate of the forward reaction increase when the surface area of a reactant is increased
?
When the surface area increases, the concentration of the substance increases, which reduces
the number of effective collisions.
When the surface area increases, the temperature of the system increases, which in turn
increases the number of effective collisions.
When the surface area increases, the density of the substance increases, which increases the
number of collisions.
When the surface area increases, the number of particle collisions increases, which in turn
increases the number of effective collisions.
Another term for natural radioactive decay into another element is
Answer:
The process of unstable (or radioactive) atoms becomes stable by emitting radiation. This event over time is called radioactive decay. Alpha decay results in the loss of two protons and two neutrons from the nucleus
Answer:
radioactive disintegration
Explanation:
Which is the correct bond type for a compound of CO2?
A. IONIC
B. COVALENT
C. METALLIC.
D. NONE OF THE ABOVE
Answer:
Explanation:
it is a covalent bond
carbon atom contains 4 electrons in its valance shell.here,carbon atom shares two of its electrons with two electrons of each oxygen atom forming double covalent bond and forms C02 molecule.
Your silver watchband has a mass of 326 g. How many moles of Ag do you have?
Answer:
3.02 moles
Explanation:
Converted using mole calculator.
Answer:
[tex]\boxed {\boxed {\sf 3.02 \ mol \ Ag}}[/tex]
Explanation:
We want to convert grams of silver to moles of silver. We can do this in 2 steps.
1. Convert Grams to MolesWe can convert grams to moles using the molar mass. It tells us the mass of 1 mole of a substance.
This is a value found on the Periodic Table. It is the same value as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu). Look up silver's molar mass.
Ag: 107.868 g/molLet's make a ratio using the molar mass.
[tex]\frac{107.868 \ g\ Ag}{ 1 \ mol \ Ag}[/tex]
Since we are converting 326 grams to moles, we multiply by that value.
[tex]326 \ g\ Ag*\frac{107.868 \ g\ Ag}{ 1 \ mol \ Ag}[/tex]
Flip the ratio so the units of grams of silver cancel.
[tex]326 \ g\ Ag*\frac{ 1 \ mol \ Ag}{107.868 \ g\ Ag}[/tex]
[tex]326*\frac{ 1 \ mol \ Ag}{107.868}[/tex]
[tex]\frac{ 326}{107.868} \ mol \ Ag[/tex]
[tex]3.02221233359 \ mol \ Ag[/tex]
2. RoundThe original measurement of mass (326 grams) has 3 significant figures, so our answer must have the same.
For the number we found, that is the hundredth place. The 2 in the thousandth place (3.02221233359) tells us to leave the 2 in the hundredth place.
[tex]3.02 \ mol \ Ag[/tex]
A silver watchband with a mass of 326 grams is equal to 3.02 moles of silver.
Someone help pleaseeee I will give brainliest
Answer:
2-Methylhexane
Because Ethylexane does not have hydrogen molecules neither,also it only has 2 options but they're just repeated
Which statement compares the relative strength of the electric forces that hold particles together
A. The force between two nonpolar molecules are stronger than the force between positive ions and freely moving electrons
B. The force between two polar molecules are stronger than the force between positive ions and freely moving electrons
C. The force between positive and negative ions is weaker than the force between two polar molecules
D. The force between two nonpolar molecules is weaker than the force between positive ions and freely moving electrons
A.the force between two non polar molecules are stronger than the force between positive ions and freely moving electrons
in order to balance the reaction, what number needs to go in front of F(2)?
Answer:
NA + F2 = NAF - Chemical Equation Balancer.
2 Na + F 2 → 2 NaF
Na is a reducing agent, F 2 is an oxidizing agent. ; Pale-yellow to greenish gas with a pungent, irritating odor.
Electrical charge of an alpha particle is,
A. +1
B. +2
C. +3
D. +4
Please help with this , thanks you guys very much
Answer:
I am giving u some explanation related this question pls see that
it may help u
Explanation:
The pH scale measures how acidic an object is. Objects that are not very acidic are called basic. The scale has values ranging from zero (the most acidic) to 14 (the most basic). As you can see from the pH scale above, pure water has a pH value of 7. This value is considered neutral—neither acidic or basic. Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0. A decrease in pH values from 5.0 to 4.0 means that the acidity is 10 times greater.
How pH is Measured
There are many high-tech devices that are used to measure pH in laboratories. One easy way that you can measure pH is with a strip of litmus paper. When you touch a strip of litmus paper to something, the paper changes color depending on whether the substance is acidic or basic. If the paper turns red, the substance is acidic, and if it turns blue, the substance is basic
The galvanic cell illustrated above generates a potential of +1.10V. For the construction of a second galvanic cell (not shown), only one modification was made: the Cu electrode has double the mass of the Cu electrode in the first cell. Which of the following correctly compares the initial E° for the second cell to that of first cell at 298K, and why?
Answer:
The initial E° for the second cell is the same as for the first cell.
Explanation:
Because the overall chemical reaction that occurs in the cell does not change.
The first galvanic cell generated the cell potential of +1.10 V. The second galvanic cell generates the same cell potential because the overall cell reaction remains the same.
What is a galvanic cell?The galvanic cell is given as the electrochemical cell that generates the exchange of chemical and electrical energy.
The cell potential is described as the rate of reaction with the difference in the potential of the cathode and the anode.
The reduction and the oxidation potential are governed by the number of electrons transferred in the chemical reaction.
In the second galvanic cell, the number of electrons transferred from the copper electrode will be equivalent to the first electrode, as the chemical reaction is the same. Thus, the cell potential of the second galvanic cell will be the same as the first cell.
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can someone do my watershed project ill give brainly and 80 points
which of the following elements is a metal in the periodic table
Answer:
12 My Magnesium
13 Al Aluminum
19 K Potassium
20 Ca Calcium
Explanation:
I think
please answer cansend to me
Can u please help me
Answer:
they are all true
Explanation:
What is the chemical formula of polypropylene?
Answer:
(C3H6)n
Explanation:
the chemical formula is (C3H6)n
Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?
Answer:
Explanation:
Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant). For example, the latent heat of fusion of one kilogram of water, which is the amount of heat energy that must be supplied to convert 1 kg of ice without changing the temperature of the environment (which is kept at zero degrees celsius) is 333.55 kilojoules
The latent heat of fusion of a substance also accounts for the energy required to accommodate any increase in the volume of the substance post the change of its physical state. The temperature at which the substance undergoes the phase transition is called the melting point of the substance. Unless specified to be otherwise, the pressure of the environment (when expressing the latent heat of fusion of a substance) is always assumed to be 1 atmosphere of pressure (which is roughly equal to 101.325 kilopascals).
2KOH + H2SO4 → K2SO4 + 2H20
What mass of water would be produced if 19.6g of KOH were reacted?
19.6 × ( 1 mol KOH / 56 grams KOH )
= 0.35 mol KOH
_________________________________
0.35 mol KOH ×( 2 mol H2O / 2 mol KOH )
= 0.35 mol H20
_________________________________
0.35 mol H2O × ( 18 g H2O / 1 mol H2O )
= 6.3 grams H2O
What is the chemical formula of diphosphorus monoxide?
Answer:
The chemical formula of diphosphorus monoxide is OP2.
I'm not sure if this is correct, but hope it helps! :)
PLS HELP NO LINKS
Suggest at least three ways to reduce or eliminate the amount of air pollution in pennsylvannia, bloomsburg.
Base your answer on the information below. The radioisotope uranium-238 occurs naturally in Earth's crust. The disintegration of this radioisotope is the first in a series of spontaneous decays. The sixth decay in this series produces the radioisotope radon-222. The decay of radon-222 produces the radioisotope polonium-218 that has a half- life of 3.04 minutes. Eventually, the stable isotope lead-206 is produced by the alpha decay of an unstable nuclide. Determine the original mass of a sample of Po-218, if 1.50 milligram of the sample remains unchanged after 9.12 minutes
Answer:
12 mmilligrams of Po-218 was the mass of the original starting material
Explanation:
The half-life of a radioactive material is the time taken for half the amount ofnthe original material present in a radioactive material to decay or disintegrate.
After each half-life, half the original material present at the start remains.
For the radioactive polonium-218 having a half-life of 3.04 minutes, it means that if 1 g is the starting material, after 3.04 minutes, 1/2 g will be remaining; after, 6.08 minutes 1/2 of 1/2 which is 1/4 of the starting material will be remaining; and after 9.12 minutes, 1/2 of 1/4 = 1/8 g will be remaining.
From the question, number of half-lives undergone after 9.12 minutes = 9.12/3.04 = 3 half-lives.
After 3 half-lives, 1/8 of the original material is remaining.
1/8 = 1.50 mg
The original mass of the sample at the start = 1.50 mg × 8 = 12 mg
Therefore, 12 milligrams of Po-218 was the mass of the original starting material.