Answer:
The universe is expanding
Explanation:
As long as the amount of stuff doesn't go over a critical threshold, the universe will continue to expand forever, and eventually suffer heat death, freezing out. But if there's too much stuff, the expansion of the universe will slow down and stop. Then the universe will begin to contract.
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Answer:
The universe is expanding
Explanation:
Its expanding in many ways as in technology, mind, life it self, its all part of a life form in the universe to create more life in earth and other places like the micro organism with the bacteria and the microscopic life form.
what happens when the kinetic energy of particles in a liquid state increases?
Answer:
When the kinetic energy of particles in liquid increases, the particles are pushed farther apart. This can result in the expansion of matter. More pressure will be exerted on the container in which this liquid is stored.
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Elements Electronegativity aluminum (Al) 1.61 calcium (Ca) 1 carbon (C) 2.55 chlorine (Cl) 3.16 fluorine (F) 4 hydrogen (H) 2.2 iron (Fe) 1.83 nitrogen (N) 3.04 oxygen (O) 3.44 phosphorus (P) 2.19 potassium (K) 0.82 silicon (Si) 1.9 sulfur (S) 2.58 Use the chart to determine which pair of atoms has the greatest difference in electronegativity. A. Ca – Cl B. H – Cl C. Fe – Cl D. P – Cl
Answer: The highest difference is in between N and H thus this will have greatest polarity.
Explanation:More the electro-negativity between any two elements more the polarity in the bond. Electron negativity is the tendency to pull shared pair of electrons towards it self. If the difference between two bonded elements is way too high then it may result in complete transfer of electrons from the less electronegative element to more electronegative one. Thus the bond will be ionic and highly polar.
Among given options,the electro negativity differences are:
A) Al-Si : 1.9-1.61= 0.29
B) S-Cl : 3.16- 2.58 = 0.58
C) N-H : 3.04 - 2.2 = 0.84
D) C-N : 3.04-2.55 = 0.49
The highest difference is in between N and H thus this will have greatest polarity.
What is the relation between temperature and rate of reaction ?
Answer:
Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction
Explanation:
When we increase the temperature of one of the reactants in a chemical reaction, this increases the particles kinetic energy, making them move much faster than they were before. This also increases the chance of a more successful collision and the rate of reaction.
Convert 0.965 moles of H2O to grams SHOW WORK
Answer:
17.37 grams
Explanation:
mass=moles × molar mass
mass = 0.965 × 18
mass = 17.37g
The basic unit of a chemical unit
Answer:
An atom
Explanation:
An atom is the basic unit of a chemical element. Atoms are made out of three main parts: protons, neutrons and electrons.
what color would you expect a weak base to turn the paper?
Answer:
Blue litmus paper paper turns red under acidic conditions. Red litmus paper turns blue under basic or alkaline conditions. If you're using a universal indicator, the weak base should turn those blue.
Explanation:
Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar. Glucose solutions are used to treat patients with low blood sugar. Suppose you prepare a glucose solution using the described procedure. Step 1: Dissolve 263.1 g of glucose in enough water to make 500.0 mL of solution. Step 2: Transfer 19.2 mL of the solution to a new flask and add enough water to make 250.0 mL of dilute solution. What is the molar concentration of the glucose solution at the end of the procedure?
Ans180.158 g
Molar mass (glucose): 6×12.0011 g+12×1.00794 g+6×15.9994 g=180.158 g,1.5×10−1mol ×180.158 g/mol =27 g. 6 × 12.0011 g + 12 × 1.00794 g + 6 × 15.9994 g = 180.158 g , 1.5 × 10 − 1 mol × 180.158 g/ mol = 27 g.wer:
Explanation:
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The molar concentration of the glucose solution at the end of the procedure is 0.224 M.
In the first step, we dissolve 263.1 g of glucose (molar mass=180.16 g/mol) in enough water to make 500.0 mL of solution. We can calculate the molarity of the initial solution using the following expression.
[tex]M = \frac{mass\ glucose}{molar\ mass\ glucose \times liters\ solution } = \frac{263.1 g}{180.16 g/mol \times 0.5000 L } = 2.921 M[/tex]
In the second step, we take a volume (V₁) of 19.2 mL of the 2.921 M (C₁) solution and add enough water to make 250.0 mL (V₂) of dilute solution. We can find the concentration of the dilute solution (C₂) using the dilution rule.
[tex]C_1 \times V_1 = C_2 \times V_2\\C_2 = \frac{C_1 \times V_1}{V_2} = \frac{2.921 M \times 19.2 mL}{250.0 mL} = 0.224 M[/tex]
The molar concentration of the glucose solution at the end of the procedure is 0.224 M.
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The area of the 48 contiguous states is 3.02 x 106 miles2. Assume that these states are completely flat, no mountains and no valleys. What mass of water would cover these states with a rainfall of two inches?
Answer:
1 mile = 1,609 meters
3.02E6 mi^2 x (1609^2m^2/mi^2) = 7.818E12 m^2
1 in= 2.54 cm => 2 in = 5.08cm = .0508m
7.818E12 m^2 x .0508m = 3.97E11 m^3
1 cubic meter = 1,000,000 cubic centimeters
3.97E11 m^3 x (1,000,000 cm^3 / m^3) = 3.97E17 cm^3
1000 cm^3 = 1L
3.97E17 cm^3 x (1L / 1000cm^3) = 3.97E14 L
or 3.97 x 10^14 L
convert to grams since 1L is 1000g
(3.97x10^14) x1000g which is 3.974x10^ 17g which is the final ans
Explanation:
The water that can be held is 3.974x10¹⁷g
What to do to calculate the mass of water?
The measures given should be first given to the units in the metric system. In this way, the mile will be converted to meters. Then,
Here,
1 mile = 1,609 meters
So,
3.02 m² x (1609m²/m²) = 7.818E12 m²
According to the metric system, inches will also be converted to meters. So
1 in= 2.54 cm
=> 2 in = 5.08cm = .0508m
Now, Equating these equations,
7.818 m² x .0508m = 3.97 m³
We know that
1 cubic meter = 1,000,000 cubic centimeters
According to that,
3.97 m³ x (1,000,000 cm³ / m³) = 3.97 cm³
Also, we know that,
1000 cm³ = 1L
3.97 cm³ x (1L / 1000cm³) = 3.97 x 10¹⁴ L
Now, converting this value to grams as 1L is 1000g
(3.97x10¹⁴) x1000g = 3.974x10¹⁷g.
Therefore, 3.974x10¹⁷g is the final answer.
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2. Levetiracetam is marketed under the trade name Keppra it is a drug used for to prevent seizures. The
chemical formula for this drug is C&H14N202.
a. What is the molar mass of this drug? 170.209 g/mol
b. How many moles are in 15mg of this drug (1000mg = 1 gram)?
c. How many molecules are in 15mg of this drug?
d. How many oxygen atoms are in 15mg of this drug?
e. How many aitrogen atoms are in 15mg of this drug?
Answer:
a. C₈H₁₄N₂O₂ = 107.209 g/mol
b. Approximately 1.4 × 10⁻⁴ moles
c. 8.423 × 10¹⁹ molecules
d. 1.685 × 10²⁰ atoms of oxygen
e. 1.685 × 10²⁰ atoms of nitrogen
Explanation:
The chemical formula is found as follows;
X×12 + 14×1 + 14×2 + 16×2 = 170.209
Where:
X = Number of carbon atoms per mole of C&H₁₄N₂O₂
Therefore;
X × 12 = 170.209 - 74 = 96.209
X = 96.209/12 = 8.017 ≈ 8
The chemical formula is C₈H₁₄N₂O₂
b. The number of moles, n, is found as follows;
[tex]n = \dfrac{Mass \ of \ sample}{Molar \ mass \ of \ the \ sample} = \dfrac{15 \times \dfrac{1}{1000} }{107.209} = 1.4 \times 10^{-4} \ moles[/tex]
c. The number of molecules, N, is given by the following relation;
N = [tex]N_A[/tex] × n
Where:
[tex]N_A[/tex] = Avogadro's number = 6.02 × 10²³ molecules
∴ N = 6.02 × 10²³ × 1.4 × 10⁻⁴ = 8.423 × 10¹⁹ molecules
d. The number of oxygen atom per molecule of C₈H₁₄N₂O₂ = 2 oxygen atoms
The number molecules of C₈H₁₄N₂O₂ in 15 mg of C₈H₁₄N₂O₂ = 8.423 × 10¹⁹ molecules
Therefore;
The number of oxygen atom per 15 mg of C₈H₁₄N₂O₂ = 2 × 8.423 × 10¹⁹ oxygen atoms
The number of oxygen atom per 15 mg of C₈H₁₄N₂O₂ = 1.685 × 10²⁰ atoms of oxygen
e. The number of nitrogen atoms are equal to the number of oxygen atoms per molecule of C₈H₁₄N₂O₂, therefore;
The number of nitrogen atoms = 1.685 × 10²⁰ atoms of nitrogen.
Is the number of neutrons equal to the atomic number minus the atomic mass?
Answer:
Yes! That is trueeee
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How many molecules are in 3.8 mols of copper?
Answer:
Hi there!
The correct answer is 2.29 x [tex]10^{24}[/tex] molecules
Explanation:
To convert from the moles to molecules:
1 mole = 6.022 x 10²³ molecules
so basically you multiply 3.8 by 6.022 x 10²³
and you get: 2.29 x [tex]10^{24}[/tex]
According to its periodic table entry, how many electrons does nickel have in its valence level? 2 8 16 28
Answer:
Nickel has an atomic number of 28,so it has 28 electrons
Nickel has 10 valence electrons
Answer: 16
Explanation:
what geologic features might form in convergent boundaries
Pls help
Calculate the heat required for the following two processes, and compare the results.
a. A 100.0 g sample of solid ethanol melts at its melting point. Hfus = 4.94 kJ/mol
b. A 100.0 g sample of liquid ethanol vaporizes at its boiling point. Hvap = 38.6 kJ/mol
Answer:
A. 10.74 KJ
B. 83.92 KJ
Explanation:
A. Data obtained from the question include the following:
Mass (m) of ethanol = 100g
Heat of fusion, Hfus = 4.94 kJ/mol
Heat (Q) =..?
Next, we shall determine the number of mole in 100g of ethanol, C2H5OH. This is illustrated below:
Mass of C2H5OH = 100g
Molar mass of C2H5OH = (2x12)+ (5x1) + 16 + 1 = 46g/mol
Number of mole (n) of C2H5OH =..?
Mole = Mass /Molar Mass
Number of mole (n) of C2H5OH = 100/46 = 2.174 moles.
Now, we can obtain the heat required to melt the ethanol as follow:
Q = n x Hfus
Q = 2.174 mol x 4.94 kJ/mol
Q = 10.74KJ
Therefore, 10.74 KJ of heat is required to melt the ethanol.
B. Data obtained from the question include the following:
Mass of C2H5OH = 100g
Heat of vaporisation, Hvap = 38.6 kJ/mol
Heat (Q) =..?
As calculated above, the number of mole in 100g of ethanol, C2H5OH is 2.174 moles.
The heat required to vaporise the ethanol can be obtained as follow:
Q = n x Hvap
Q = 2.174 mol x 38.6 kJ/mol
Q = 83.92 KJ
Therefore, 83.92 KJ of heat is required to vaporise the ethanol.
C. From the above calculations, a higher amount of heat energy i.e 83.92 KJ is required to vaporise the ethanol and a lesser amount of heat energy i.e 10.74 KJ is needed to melt the ethanol.
The heat required for the following two processes are:
a. 10.74 KJ
b. 83.92 KJ
Part a)
Given:
Mass (m) of ethanol = 100g
Heat of fusion, Hfus = 4.94 kJ/mol
To find:
Heat (Q) =?
Calculation for number of moles:Mass of C₂H₅OH = 100g
Molar mass of C₂H₅OH = (2x12)+ (5x1) + 16 + 1 = 46g/mol
Number of Mole = Mass /Molar Mass
Number of mole (n) of C₂H₅OH = 100/46 = 2.174 moles.
Calculation for Heat of fusion:
Q = n x Hfus
Q = 2.174 mol x 4.94 kJ/mol
Q = 10.74KJ
Therefore, 10.74 KJ of heat is required to melt the ethanol.
Part b)
Given:
Mass of C₂H₅OH = 100g
Heat of vaporization, Hvap = 38.6 kJ/mol
To find:
Heat (Q) =?
Calculation for Heat of vaporization:
As calculated above, the number of mole in 100g of ethanol, C₂H₅OH is 2.174 moles.
The heat required to vaporize the ethanol can be obtained as follow:
Q = n x Hvap
Q = 2.174 mol x 38.6 kJ/mol
Q = 83.92 KJ
Therefore, 83.92 KJ of heat is required to vaporize the ethanol.
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Balance the equation
(Image below)
If equal moles of hydronium ion and hydroxide react, what is the resulting solution Acidic Basic Neutral Nonpolar
Answer:
Neutral
Explanation:
1 Mole OH- = Hard Base
1 mole H3O+ = Hard Acid
2 H2O(l) ⇆ H3O+ (aq) + OH- (aq)
HSAB
Soft acids react fastest and form the strongest bonds with soft bases
Hard acids react fastest and form the strongest bonds with Hard bases
Resulting solution is definitely not non-polar as the result is H2O which is polar.
Acid: A solution that has an excess of H+ ions
Base: A solution that has an excess of OH- ions.
H2O is neutral because the concentration of hydrogen and hydroxide ions is the same.
In a molecule of PCl3, 6 electrons will form
A) nonpolar covalent bonds
B) polar covalent bonds
C) ionic bonds
D) hydrogen bonds
Answer:
polar covalent bonds
Explanation:
Phosphorus trichloride is a chemical compound of phosphorus and chlorine, having the chemical formula PCl 3. It has a trigonal pyramidal shape, owing to the lone pairs of electrons on the phosphorus atom.
Chlorine is more elctronegative than phosphorus . Phosphorus has a lone pair of electrons and every chlorine atom has three pairs of electrons . The molecule is not symmetrical as the shared electron pairs are closer to the chlorine atoms than the phosphorus atoms , the chlorine atoms are shifted towards one side of the center of the molecule , thus a net dipole effect is created. This is the reason why the molecule is polar .
what organisms can be infected by Ebola
Answer:
Ebola is a rare but deadly virus that causes fever, body aches, and diarrhea, and sometimes bleeding inside and outside the body. As the virus spreads through the body, it damages the immune system and organs. Ultimately, it causes levels of blood-clotting cells to drop. This leads to severe, uncontrollable bleeding.
Explanation:
5.If 30mL of 0.5M NaOH(aq) was used to neutralize 10mL of HCl(aq), what is the concentration of the acid? Show work.
Answer:
0.15M
Explanation:
NaOH + HCl -->NaCl + H2O
moles of NaOH reacted with HCl
(0.5 × 30)/1000 = 1.5 × 10^ -3
so the moles of HCl reacted with NaOH
1.5 × 10^ -3
concentration of HCl = ( 1.5 × 10^ -3)/10 ×1000
As a train rushes away from a crossing, the pitch of its horn goes down because _____________________.
a sound waves get farther apart as the source of the sound moves closer
b sound waves get farther apart as the source of the sound moves away
c sound waves get closer together as the source of the sound moves away
d sound waves stay the same distance from each other as the source of the sound moves away
Answer:
The awnser is b
Explanation:
The sound waves get smaller as the sound moves farther away, and since the sound waves are smaller, the sound is quieter. This is known as the Doppler effect.
Checking if my answer is correct: I got LARQY, but I'm pretty sure it's wrong. Can somebody please help?
Answer:
you are right
Explanation:
and i do not need to explain it because you did
Increasing pressure would most likely increase the reaction
rate between which substances?
A. A gas and a gas
B. A solid and a liquid
C. A liquid and a liquid
D. A liquid and a gas
Answer:
A
Explanation:
the same number of molecules occupy a small space
Why is Jon Dalton’s discovery important to science? Help please
Answer:
Dalton expressed his assumption in A Modern Model of Chemical Theory that atoms of various elements should be uniformly differentiated, based on their differing atomic weights. In doing so, he became the first scientist to explain atom behavior as regards weight measurement.
Explanation:
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Which frequency of electromagnetism has higher energy and shorter wavelengths that visible light? *
white
ultraviolet
infrared
black
Answer:
ultraviolet lights have shorter wavelengths and higher frequencies
Explain why Hydrogen bonding is the strongest of the
intermolecular forces, followed by dipole-dipole interactions
and then London dispersion forces.
Answer:
Larger atoms tend to be more polarizable than smaller ones because their outer electrons are less tightly bound and are therefore more easily perturbed. Hydrogen bonds are especially strong dipole–dipole interactions between molecules that have hydrogen bonded to a highly electronegative atom, such as O, N, or F.
Explanation:
HELPPP ME PLSSS!! How many ants are in a ant hill? this is due sooo soon I need help!!
Technically this is science but it doesn't give me that option
Answer:
250,000 ants are in each colony or ant hill.
Explanation:
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What coefficients should be added in order to make this a balanced equation?
_____ SO2 + ____ H2 → _______ H2S + _____ H2O
Answer:
Hello
Coefficients are 1,3,2,1
Explanation
Calculate the mass percentage of nitrogen in chromium (III) nitrate. Round your answer to the nearest percentage.
Answer:
The percent composition for nitrogen in chromium(III) nitrate is 6%.
The mass percentage of nitrogen in chromium (III) nitrate. The percent composition for nitrogen in chromium(III) nitrate is 6%.
what are properties of nitrogen ?A bulk of earth's atmosphere is occupied by nitrogen that is 78.1 percent by volume, it is inert at standard temperature and pressure condition called as azote, is a crucial part of food and fertilizer production.
Nitrogen gas or N is nonmetallic, colorless, odorless and tasteless gas, atomic number is 7 and atomic weight of 14.0067, its density of 1.251 grams/liter at 0 degree C , its specific gravity of 0.96737.
Nitrogen gas is used in industrial and production due to its abundance and nonreactivity, nitrogen gas be used in extinguish fires, the oxygen or moisture sensitive substances like Iron, steel and electronic components, are produced in a nitrogen atmosphere.
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The acceleration of the car with the data in the table above would be m/s2. If the applied force were cut in half, what do you predict the acceleration would be? m/s2
Answer:
1. 0.33 2. 0.1 7
Explanation:
Sally wants to test how the type of light affects the height of bean plants. She uses three different types of light bulbs: LED, incandescent, and CFL. She exposes the plants to the lights for the
same amount of time and plants the seeds in containers that are the same size, with the same type of soil, and waters them with the same amount of water each day. She measures the height of
the plants using a ruler and records the growth each day. Which of the following is the independent variable in the experiment?
Answer:
Light
Explanation:
All of the other conditions are the same. As an example the amount of water which sally apply to each plant is the same. So the independent
variable that she is experiment on is the effects of different kinda lights on the growth of the bean plants
The source of light is the independent variable in the experiment of how the type of light affects the height of bean plants.
What is an independent variable?The independent variable is the variable that cannot be influenced or disturbed by the effect of the other factors or the characteristics of another thing present in the system.
In the experiment on how the type of light affects the height of bean plants, the light source LED, incandescent, and CFL have their own characteristics and cannot be affected by anything in the environment.
Therefore, in the experiment on how the type of light affects the height of bean plants, the source of light is the independent variable.
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