What kind of change is occurring (physical or chemical)? How do you know?
Consider the following reaction methane (CH4) combines with oxygen to create carbon dioxide and dihydrogen monoxide. Which of the following would be the coefficient of methane (CH4) in the balanced equation?
a. 2
b. 4
c. 5
d. 1
e. 3
Answer:
I believe it is one. I attached what I think is the balanced equation of the problem you gave. The answer is d.1
Explanation:
CH4+4O=CO2+2H2O
13. PLEASE HELP
The volume of a gas is 4.0 L, the pressure is 1 atm, and the temperature is 200 K. A chemist
changes one factor while keeping another constant so that the new volume is 5.0 L. Which of
the following could be the new conditions? (4 points)
The final pressure is 0.8 atm, while temperature is kept constant.
The final temperature is 150 K, while pressure remains constant.
The final pressure is 1.5 atm, while temperature is kept constant.
m
The final temperature is 100 K, while pressure remains constant.
Answer:
A the pressure is changed to 0.8
Explanation:
Boyles gas law
The factor that the chemist changed is so that the new volume is 5.0 L is the final pressure is 0.8 atm, while temperature is kept constant.
What is Boyle's law?Robert Boyle studied the relationship between pressure p and volume V of a fixed amount of gas held at a constant temperature in the mid 1600s.
Boyle discovered that the product of pressure and volume remains nearly constant. For an ideal gas, the product of pressure and volume is a constant.
Thus, the correct option is A, The final pressure is 0.8 atm, while temperature is kept constant.
Learn more about Boyle's law
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Plz help (it’s a picture)
Answer:
Shown below
Explanation:
Molar mass: 149.09
% Nitrogen: 28.2
% Hydrogen: 8.1
% Oxygen: 43.0
% Phosphorus: 20.8
one of many cells in the retina of the eye that responds to low light. VOCABULARY
Answer:
I hope this helps you!
Explanation:
The retina is the back part of the eye that contains the cells that respond to light. These specialized cells are called photoreceptors. ... The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. Rods are not good for color vision.
The retina is the back thing of the eye that has the cells that respond to the light. These specialized cells are known as photoreceptors.
find the mass of an object on earth if its weight is 100N
what is the weight of an object on a planet with gravity of 2m/s^2 and mass 4 kg
if an object has mass of 200 g on earth what is its weight
find the force of an object if its mass is 6 kg and its on earth
finf the mass of an object if its force is 150 N and a = 10 m/s^2
Answer:
0.19 kg
8 N
1.964 N
58.86 N
15 kg
Explanation:
w = Weight of an object = 100 N
g = Acceleration due to gravity of Earth = [tex]9.81\ \text{m/s}^2[/tex]
m = Mass of an object
Weight is given by
[tex]w=mg\\\Rightarrow m=\dfrac{w}{g}\\\Rightarrow m=\dfrac{100}{9.81}\\\Rightarrow m=10.19\ \text{kg}[/tex]
Mass of the object is 0.19 kg
g = [tex]2\ \text{m/s}^2[/tex]
m = 4 kg
[tex]w=mg\\\Rightarrow w=4\times 2\\\Rightarrow w=8\ \text{N}[/tex]
Weight of the object is 8 N.
m = 200 g
[tex]w=mg\\\Rightarrow w=0.2\times 9.81\\\Rightarrow w=1.964\ \text{N}[/tex]
Weight of the object is 1.964 N.
Weight is the force the Earth exerts on an object which is on the surface of the Earth.
m = 6kg
[tex]w=mg\\\Rightarrow w=6\times 9.81\\\Rightarrow w=58.86\ \text{N}[/tex]
The force of the object is 58.86 N.
w = 150 N
a = g = [tex]10\ \text{m/s}^2[/tex]
[tex]m=\dfrac{w}{g}\\\Rightarrow m=\dfrac{150}{10}\\\Rightarrow m=15\ \text{kg}[/tex]
Mass of the object is 15 kg.
Plz answer fast , (it’s a picture
Answer:
Explanation:
1.4193.61
2.1.69205e7
3.1.57611e14
4.46270.5
¿Cuál es la principal diferencia entre la idea de átomo de Dalton y la de Rutherford?
como estas homie jit cuh fr
Classify the following statement as a prediction, observation, theory,
or law. Please be sure to classify the statement exactly as it is
written!
If he kicks the ball, then it will go into the goal.
Answer:
I believe that it is a prediction.
Explanation:
Because you can't kick the ball and say it will go into the goal. Of course if it is right in front of the goal and you kick it will go in but in both cases if you kick it too hard it will go in and then bounce off the net and roll back out of the goal. So in my opinion it is a prediction.
What can be said about a reaction with AH= -890 kJ/mol and AS = -0.24
kJ/mol.K)?
A. It is always spontaneous.
B. It is never spontaneous.
C. It is spontaneous at 2000 K.
D. It is at equilibrium at 371 K.
Answer:
It is spontaneous at 2000 K
Explanation:
ΔG = ΔH -TΔS
When ΔG =0 the reaction is neither spontaneous nor non spontaneous. At that point the temperature will be:
0 = -890 -T x -0.24
890 = -0.24 x T
T = 3708 K
If temperature is lower than 3708 K, that will push ΔG into negative territory. ΔG < 0, meaning the reaction will be spontaneous.
So at 2000 K is definitely spontaneous.
a and B are not correct because the T determine if it is spontaneous.
According to reaction with AH= -890 kJ/mol and AS = -0.24
kJ/mol.K then it will be It is spontaneous at 2000 K.
What is spontaneous?The spontaneous process occurs when there is no additional input to the given system.
Calculation of spontaneous
It can be calculated by using the formula.
ΔG = ΔH - TΔS
where, ΔG = Gibbs free energy, ΔH = enthalpy, ΔS = entropy.
When ΔG will be equal to zero then reaction will be neither spontaneous nor non- spontaneous .
By putting the value of ΔG = 0 and
ΔG = ΔH - TΔS
0 = -890- T × -0.24
890 = -0.24T
T = 3708 K
It is known that if the value of temperature will be lower than 3708 K than reaction will be spontaneous.
Hence, at 2000 K will be spontaneous.
Therefore, the correct answer will be option (C).
To know more about spontaneous.
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Which refers to solid ice that condenses and forms on surfaces like grass or windows?
dew
frost
hail
sleet
Frost refers to solid ice that condenses and forms on surfaces like grass or windows.
WHAT IS FROST?Frost refers to a deposit of small white ice crystals formed on solid surfaces when the temperature falls below freezing temperature.
Frost forms when the temperature of the atmosphere is below freezing i.e. < 0°C.
Therefore, frost refers to solid ice that condenses and forms on surfaces like grass or windows.
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2A(g) + B(l) ⇌ 3C(aq) + D(s)
Answer:
B
[(0.75)^3(0.25)]÷[(0.50)^2(0.75)]
Explanation:
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The nervous system can work through sense _________________ (eyes, ears, nose, skin, taste buds)
organs
glands
cells
nerves
Answer:
Organs
Explanation:
Organs such as ears which enables animals to hear, The eyes which gives vision, the nose which is responsible for smelling and perceiving odors, The skin which enables animals to feel and the taste buds which permits animals to make distinction between sweetness, bitterness, sour are collectively called the sense Organs. The nervous systems principally made of a connection of neurons allows the trasmission of signals between different body parts. The purpose served by the sense Organs and nervous systems makes it possible makes the possibility of the nervous systems working through the sense Organs possible.
6. The gas in a steel cylinder is at 55 °C and a pressure of 965 mmHg. What would be the temperature,
in Celsius, when the pressure is 850 mmHg?
Answer:
91.4°C
Explanation:
Gay - Lussac Law => T ∝ P => T = kP => k = T/P with volume (V) and mass (n) constant.
For two different Temperature (T)-Pressure (P) conditions
k₁ = k₂ => T₁/P₁ = T₂/P₂ => T₂ = T₁(P₂/P₁)
T₁ = 55°C = (55 + 273)K = 328K
P₁ = 965 mmHg
T₂ = ?
P₂ = 850 mmHg
T₂ = T₁(P₂/P₁) = 328K(850 mmHg/965 mmHg) = 364K = (364 - 273)°C = 91.4°C
If the solubility of a N30 gas is 2.26g/l at 1.26atm of pressure, what is the solubility of
the gas at 0.02atm?
0.12g/L
0.41g/L
0.04g/L
0.27g/L
What does the group number of an element tell you about the electrons?
Answer:
Explanation:
The group number of an element tells about the total number of electrons present in the valence shell or orbit of an atom.
justify, a substance is not totally consumed after two half lives.
Answer:
The answer is in the explanation
Explanation:
Half-life is defined as the time that a substance requires to decrease its concentration in the half of the initial concentration. For example, if we have 1M of a substance X, after 1 half life the concentration is:
1M / 2 = 0.5M
Now, after the second half-life, the concentration would be:
0.5M / 2 = 0.25M
That is the reason why the substance is not totally consumed after two half lives.
NEED HELP ASAP CHEMISTRY. Giving away Many points, i got 20+ more questions
I'm almost positive that it's D
how does gas create pressure?
a. the force of a collision between two gas molecules with the same amount of kinetic energy creates pressure
b. the force of a collision of a gas molecule against the walls of its container create pressure
c. the force of a collision between two gas molecules with different temperatures creates pressure
d. the force of a collision of a gas molecule against the air in a container creates pressure
What do we mean when we say atoms bond together?
Answer:
When two or more atoms chemically bond together, they form a molecule. Sometimes the atoms are all from the same element.
A Compound.
Explanation:
For example, when three oxygen atoms bond together, they form a molecule of ozone (O3). If a molecule forms from atoms of two or more different elements, we call it a compound.
Hope this helps!!
How many moles of solute would you need to add to 500mL solution to get a
molarity of 3.7 mol/L?
Answer:
7.4 moles solute
Explanation:
From definition of Molarity (M) = moles solute (n)/volume of solution in Liters(V)
=> moles solute (n) = Molarity (M) x Volume (L) = (3.7 moles/L)(0.500L) = 7.4 moles solute
PLS HELP!!
The average human will breathe in 1.2 million moles of oxygen atoms in their lifetime. What is the mass of this amount of oxygen in grams?
Answer:
19,199,280 grams
Explanation:
0.062502343837894 grams in one mole of oxygen
WILL GIVE BRANLIEST!!! Methane, CH4 is a __ (polar, nonpolar) molecule. In a molecule of methane, the primary intermolecular forces are ___ (London dispersion forces, dipole dipole forces, hydrogen forces, hydrogen bonding)
Answer:
Nonpolar; London dispersion forces
Explanation:
8. If 400 mL of gas has a temperature of 75°C, then what would be the new volume if the temperature increased to 95°C?
We are given:
V₁ = 400 mL T₁ = 75°c = (273+75)K = 348K
V₂ = x mL T₂ = 95°c = (273+95)K = 368K
Deriving Boyle's Law:
here, we can see that the volume and temperature are the only variables
from the ideal gas equation:
PV = nRT
T /V = P / nR
because P, n and R are constants, P/nR is a constant value
T / V = constant
which means that the initial and final ratio of P and T will be constant, hence:
T₁ / V₁ = T₂ / V₂, this is also known as the Charles' law. what I did above was it's derivation
Finding final volume:
plugging the given values:
348/400 = 368 / x
x = 368*400 / 348
x = 422.9 mL
Which of the following will speed up a reaction?
A. Decreased concentration of reactants B. Removal of catalysts
C. Increased temperature
D. Less surface area on reactants
Answer:
C
Explanation:
Imcreased tmperature will speed up a reaction/process.
Answer:
C
Explanation:
Adding catalyst can most effectively speed up the chemical reaction.
Which of the following statements correctly describes the greenhouse effect
Does gold have high lustre?
Why do you think evolution is important?
Question 1: Jensen is a huge fan of Wendy’s, especially their buttermilk ranch dressing. One of his friends told him that they wouldn’t be surprised if he had decided to take a bath with it, so naturally, he wants to do just that. The net weight of a single ranch container is 21.3g and the weight of the packaging is 0.4g, with a volume of 0.75fl oz. Jensen’s perfectly rectangular bathtub has the dimensions 2.3m x 1.2m x 0.46m. Using this information, calculate a) the density of the ranch dressing, b) the mass of ranch dressing needed to fill the tub to the brim, and c) the number of containers of ranch he needs to fill the tub.
Useful Conversions: 1 fl oz = 29.57 mL, 1 cm3 = 1 mL
Answer:
has the dimensions 2.3m x 1.2m x 0.46m. Using this information, calculate a) the density of the ranch dressing, b) the mass of ranch dressing needed to fill the tub
At what temperature will 2.50 moles of ideal
gas produce a pressure of 25.0 atm in a 10.0 L
container
Answer: 1,218K
Explanation: