Answer:
water
Explanation:
or h2o i mean theyre the same thing soo..
How many moles of gas are there in 45.0L container at 25.0 Celsius and 500.0 mm Hg?
Answer:
n = 1.21mol
Explanation:
Using the formula:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = gas constant (0.0821 Latmk mol)
n = number of moles
T = temperature (K)
T(K) = 25°C + 273.15
T(K) = 298.15K
Pressure in 500.0 mm Hg = 500/760
= 0.657atm
PV = nRT
0.657 × 45 = n × 0.0821 × 298.15
29.565 = 24.478n
n = 29.565/24.478
n = 1.207
n = 1.21mol
Can someone please tell me the answer
Answer:
52.068 amu
Explanation:
To calculate the average atomic mass of chromium, you have to first multiply the abundance of an isotope with its mass.
49.946 × 0.0435 = 2.173
51.941 × 0.838 = 43.527
52.941 × 0.0235 = 1.244
53.939 × 0.095 = 5.124
Next, add up all of the values, and you will get the average atomic mass.
2.173 + 45.527 + 1.244 + 5.124 = 52.068 amu
A 26.9 g rock rolls down the Hill at a speed of 81.9 m/s. what is the kinetic energy of the rock?
Answer:
90.21 J
Explanation:
Given that,
Mass of a rock, m = 26.9 g = 0.0269 kg
Speed of the rock, v = 81.9 m/s
We need to find the kinetic energy of the rock. It can be calculated using the formula as follows :
[tex]E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.0269\times 81.9^2\\\\E=90.21\ J[/tex]
So, the kinetic energy of the rock is 90.21 J.
Which describes any compound that has at least one element from group 17
A.halide
B.noble gas
C.meltalloid
D.Transition metal
HELP
20 pts!
What is the Molarity(mol/L) of a solution made by dissolving 2.25 grams KOH in enough water to make 100.0 mL of solution? (only write down the numerical value to the correct number of sig figs)
Answer:
Molarity is the concentration of x moles of solute in 1 L of solution. ... What is the molarity of a solution prepared by dissolving 15.0 g of NaOH in enough water to make a total ... Litres of solution=225mL soln ×1 L soln1000mL soln =0.225 L soln ... (MM = 97.10 g/mole) dissolved in 75.00mL of D.I. water was titrated with KOH.
Explanation:
i just know XD
Answer:
2.17 so have a nice day
hope its right
f the solubility of sodium chloride (NaCl) is 30.6 g/100 mL of H2O at a given temperature, how many grams of NaCl can be dissolved in 250.0 mL of H2O
Answer:
76.5 grams
Explanation:
Solubility of sodium chloride = [tex]\dfrac{30.6}{100}=0.306\ \text{g/mL}[/tex]
Now volume of water is 250 mL
We have to find the amount of NaCl that can be dissolved in the above mentioned amount of water
Let the mass of NaCl that can be dissolved be m so
[tex]\dfrac{m}{250}=0.306\\\Rightarrow m=250\times0.306\\\Rightarrow m=76.5\ \text{g}[/tex]
The mass of NaCl that can be dissolved is 76.5 grams.
The arrangement of the elements from left to right in the period 4 on the periodic table is based on
Answer:
Image result for The arrangement of the elements from left to right in the period 4 on the periodic table is based on
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods
Explanation:
Answer:atomic mass
Explanation:
Order the materials from causing the greatest refraction to causing the least refraction.
A
water, air, oil
B
air, water, oil
C
oil, water, air
D
none of the above
What is the valence level for the element
Be
H
C
K
What is oxygen level?
Answer:
a oxygen level is the deferent rate or hight witch the oxygen levels sits at
5
1 point
Water(H20) has a higher boiling point then formaldehyde (CH20). Why does water have a higher boiling point than formaldehyde?
Answer:
because the intermolecular forces of attention in water is stronger than that of formaldehydeExplanation:
since the forces of attraction are strong the molecules are strongly bonded and thus require high energy to break that bond..
conversation 13kg into gram
4 poi ts
Answer:
13000
Explanation:
The kilogram, or kilogramme, is the base unit of weight in the Metric system. It is the approximate weight of a cube of water 10 centimeters on a side.
A gram is a unit of weight equal to 1/1000th of a kilogram. A gram is the approximate weight of a cubic centimeter of water.
Which statement about polymers is true?
A.
Polymers are substances that have relatively large molecules.
B.
Oil and gas are the starting materials for making all polymers.
C.
Fabrics such as cotton and silk are synthetic polymers.
D.
All polymers are obtained from living organisms.
Answer:
I hope this helps
Explanation:
What is the relationship between the motion of the water molecules and the heat added to or removed from the system in the simulation?
Answer:
The motion of the water molecules increase as heat is added.
Explanation:
Hello!
In this case, in general terms, one can know that molecules and heat have a relationship by which one affects the other, more specifically, the heat affects how the molecules behave. In such a way, as the heat added to a system increases its internal energy, one can notice that energy speeds up the molecules because they acquire such energy and the motion starts being increased, it means, the molecules start moving or vibrating faster than before of that heat addition. This is due to the increase of the internal energy, which based on the first law of thermodynamics is related with the velocity of the molecules.
Best regards!
2H2 + 02-------2H20
How does the equation above demonstrate the law of conservation of mass?
(Giving brainliest)
What happens when a charged balloon is brought close to a wall?
A) The balloon becomes negatively charged.
B) The charges in the wall rearrange themselves.
C) The wall and the balloon repel each other.
Answer:
The answer is C.
Explanation:
the wall and the ballon will use negative energy to repel eachother
When a charged balloon is brought close to a wall the walls and the balloon repel each other. Therefore, option C is correct.
What is electrostatic force ?Non-contact forces, such as electrostatic forces, pull or push on objects without touching them. When certain materials are rubbed together, a phenomenon known as 'charge' is transferred from one surface to the other. Charged objects pull on uncharged objects and can push or pull on charged objects.
We already know that positive and negative charges interact. However, the size of the electrostatic force determines the strength of this interaction.
When the charged balloon is brought close to the wall, it repels some of the wall's negatively charged electrons . As a result, that section of the wall is repelled.
Thus, option C is correct.
To learn more about an electrostatic force, follow the link;
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Which sentence correctly explains the change that occurs when ice melts?
Ice melting is a physical change, and the state of the substance remains the same.
Ice melting is a physical change, and the mass of the substance remains the same.
Ice melting is a chemical change, and the state of the substance remains the same.
Ice melting is a chemical change, and the mass of the substance remains the same.
Answer:
Ice melting is a physical change, and the mass of the substance remains the same.
Explanation:
Hello!
In this case, since the phase transitions from solid to liquid, liquid to gas, solid to gas and vice versa are physical changes by which the molecules change their arrangement, being close for solids, not so close, not so far for liquids and spread for gases, the more the energy added, the more separated the molecules they turn out.
However, when the appropriate amount of energy is added, the mass of the changing substance remains the same and the change takes place, it means that the correct answer, when ice melts, is ice melting is a physical change, and the mass of the substance remains the same.
Best regards
Answer:
its b
Explanation:
thermal conductors and insalators
Answer:
are both thermal?
Explanation:
How many atoms are in 0.54 moles of chromium?
Answer:
3.25*10^23 atoms
Please help me I need the answer and it’s due almost due I can’t fail
A cheeseburger from Mchemistry contains 19g of fat, 20g of carbs, and 28g of protein
Total calories : 363 kcal
Further explanationComplete question
A cheeseburger from a fast-food restaurant contains 19g of fat, 20g of carbs, and 28g of protein. How many kcal of energy does the cheeseburger contain?
We convert each gram of composition to kcal :
1 gram of fat = 9 kcal
1 gram of carbs = 4 kcal
1 gram of proteins = 4 kcal
Fat[tex]\tt 19\times 9~kcal=171~kcal[/tex]
Carbs[tex]\tt 20\times 4=80~kcal[/tex]
Protein[tex]\tt 28\times 4=112~kcal[/tex]
Total calories[tex]\tt 171+80+112=363~kcal[/tex]
You start with 4800 grams uranium - 238. It's radioactive and goes
through alpha decay. How many grams remain after 7 half-lives.
Answer:
37.5g
Explanation:
The half-life is the time taken for a radioactive substance to decay to half its original composition;
Original composition here is = 4800g of U-238
How many grams remain after 7 half-lives;
After each life, the uranium reduces by half;
Amount remaining = 4800 x [tex](\frac{1}{2})^7[/tex]
= 37.5g
After 7 half lives, 37.5g of the original sample will remain.
3NH3 means what in chemistry
The conversion of (CH3)3CI to (CH3)2C=CH2 can occur
by either one-step or two-step mechanism, as shown in
Equations (1) and (2]
[1]
있
+ I + H₂O
HK
OH
[2]
07
Slow
+ H₂O
+ I
f) Assume Equation [a] represents an endothermic reaction
and that the product of the rate determining step is
higher in energy than the reactants or products.
Draw an energy dagram for this two-step reaction.
Label the axes, reactants and products for each step,
and the Ea and 4to for each step. Label 44° overall.
Draw the structure for both transition states.
Answer:
See explanation
Explanation:
a) The rate equation for the mechanism in equation 1 is [(CH3)3CCI] [OH^-]
b) The rate equation for the mechanism in equation 2 is [(CH3)3CCI]
c) The first equation is second order while the first equation is first order.
d) The rate equation shows the species that are involved in the rate determining step. Hence by manipulating the concentration of the species that appear in each rate equation, we can exactly know which of the rate equations represents the actual mechanism of the reaction.
e) The diagram required is shown in the image attached to this answer.
Write the balanced equation for the reaction that occurs when Iron (III) nitrate is mixed with magnesium oxide forming iron(III) oxide and magnesium nitrate
Answer:
2Fe(NO₃)₃ + 3MgO → Fe₂O₃ + 3Mg(NO₃)₂
Explanation:
Given chemical species:
Reactants: Iron(III) nitrate
Magnesium oxide
Products: Iron (III) oxide
Magnesium nitrate
The chemical symbols:
Fe(NO₃)₃ + MgO → Fe₂O₃ + Mg(NO₃)₂
The reaction of this type is called a double displacement reaction.
Now let us ensure that it is balanced;
aFe(NO₃)₃ + bMgO → cFe₂O₃ + dMg(NO₃)₂
Conserving Fe;
a = 2c
Conserving N;
3a = 2d
Conserving O
9a + b = 3c + 6d
Conserving Mg
b = d
let a = 1, c = [tex]\frac{1}{2}[/tex] , d = [tex]\frac{3}{2}[/tex], b = [tex]\frac{3}{2}[/tex]
multiply through by 2;
a = 2, c = 1, d = 3 and b = 3
2Fe(NO₃)₃ + 3MgO → Fe₂O₃ + 3Mg(NO₃)₂
When measuring the distance between Atlanta to New York City, which would be the BEST unit of measurement?
Answer:Kilometer, I think
Explanation:
considering radiation weighting factors only, how many times more dangerous are alpha particles than protons?
a. 1
b. 2
c. 10
d. 20
Answer:
C. 10
Explanation:
So wr for protons is 2 and wr for alpha particles is 20. In these terms, alpha particles cause ten times more damage then protons.
10 times more dangerous are alpha particles than protons. The correct option is C. 10.
What is radiation?Radiation is emission or transmission of energy in the form of waves.
The waves are electromagnetic waves, infrared rays, x- rays, ultraviolet rays, etc.
Thus, the correct option is C, 10.
Learn more about radiation
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how do the properties of alloys compare to the properties of the materials used to form them?
Answer:
An alloy is a mixture or metallic-solid solution composed of two or more elements. Examples of alloys include materials such as brass, pewter, phosphor bronze, amalgam, and steel. Complete solid solution alloys give single solid phase microstructure. Partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal history. An alloy’s properties are usually different from those of its component elements.
Examples of alloys include materials such as brass, pewter, phosphor bronze, amalgam, and steel. Complete solid solution alloys give single solid phase microstructure. Partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal history. An alloy’s properties are usually different from those of its component elements.
image
Steel: Steel is an alloy whose major component is iron.
Alloy constituents are usually measured by mass. An alloy is usually classified as either substitutional or interstitial, depending on its atomic arrangement. In a substitutional alloy, the atoms from each element can occupy the same sites as their counterpart. In interstitial alloys, the atoms do not occupy the same sites. Alloys can be further classified as homogeneous (consisting of a single phase), heterogeneous (consisting of two or more phases), or intermetallic (where there is no distinct boundary between phases).
Alloying a metal involves combining it with one or more other metals or non-metals, which often enhances its properties. For example, steel is stronger than iron, its primary element. Physical properties (density, reactivity, conductivity) of an alloy may not differ greatly from those of its constituent elements, but its engineering properties (tensile strength and shear strength) may be substantially different.
Explanation:
In which of the following situations would mass be conserved?
It isn't possible to see the molecules of an object without special equipment but knowing the density of an object helps us predict what we can't see if water has a density of 1kg/m and The molecules look like the image below describe what the molecules might look like for the samples on either side compared to water molecules in lead will be
