Answer:
D
Explanation:
The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse blocking of the Sun because the Moon's orbit is tilted relative to the Earth's orbit new-moon phase is visible only at night side of the Moon faces toward the Earth apparent
These positions do not always cause an eclipse of the Sun as:
d. Apparent diameter of the Moon is greatest during the new-moon phase
New-moon phase:At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated. The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse blocking of the Sun because the Moon's orbit is tilted relative to the Earth's orbit. New-moon phase is visible only at night side of the Moon faces toward the Earth apparent.
Thus, correct option is d.
Find more information about New-moon phase here: https://brainly.com/question/12676209
When a radioactive atom emits an alpha particle, the mass number of the radioactive atom
A. Increases because the alpha particle contains 2 electrons
B. Decreases because the alpha particle contains 2 electrons
C. Increases because the alpha particle contains 2 protons
D. Decreases because the alpha particle contains 2 protons
Answer:
d or c
Explanation:
Answer:
c
Explanation:
did it
Which equilibrium describes a reversible reaction a short time after starting the reaction with reactants only?
Answer:
Should be A
Explanation:
(7.02 LC) Which statement about this reaction is correct?
Answer: The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be positive.
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l)[/tex] [tex]\Delta H=-890kJ[/tex]
on halving the reaction, enthalpy also becomes half
[tex]\frac{1}{2}CH_4(g)+O_2(g)\rightarrow \frac{1}{2}CO_2(g)+H_2O(l)[/tex] [tex]\Delta H=-445kJ[/tex]
Thus The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Is the relationship between volume and pressure direct or indirect? Explain your
answer
Answer:
Boyle's Law is a relationship between pressure and volume. In this relationship, pressure and volume have an inverse relationship when temperature is held constant. If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure.
Explanation:
What kind of energy transformations occur when you hit a coconut with a hammer
sound energy, kinetic energy,
i cant think of any more but hope this helps
Answer:
Mechanical to kinetic to sound to heat
Explanation:
Remember that all types of energy transformation end in heat
Will someone actually help me and not just something random
Answer:
D
Explanation:
As the temperature of a fixed volume of a gas increases, the pressure will _____. A. vary inversely B. increase C. decrease D. not change
Answer:
increases
Explanation:
As the temperature of a fixed volume of a gas increases, the pressure will increase.
What is Gay Lussac's law?
According to this law at constant volume of gas, pressure is directly proportional to the temperature of the gas and it is represented as:
P ∝ T.
It means that if pressure increases then temperature is also increases or if pressure decreases then temperature will also decreases.
So, pressure of the gas increases.
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HELP WORTH 20 points if Awnser is correct
.3999 moles
The ideal gas law: PV = nRT
155 degrees Celsius = 428 Kelvins
n = PV/RT
n = 2.80 atm x 5.00 L/0.0821 (gas constant) x 428 K
= 0.398 moles
At 25ºC, the average velocity of a hydrogen molecule is 1.92 x 103 m/s. What is the average velocity of a nitrogen molecule at the same temperature?
NEED WORK
Answer:
V = 513.36m/s
Explanation:
Temperature (T) = 25°C = (25 + 273.15) = 298.15K
Speed (V) = 1.92*10³m/s
According to kinetic theory of gases, the speed (v) of a molecule is
V= √(3RT / M)
V = speed or velocity
R = ideal gas constant = 0.082J/mol.K
T = temperature of the gas
M = molar mass
Molar mass of hydrogen molecule = 2.0g/mol
Molar mass of Nitrogen molecule = (2×14.0) = 28.0g/mol
Since they're in the same temperature
V1 / V2 = √(M2 / M1)
1.92×10³ / V2 = √(28 / 2)
1.92×10³ / V2 = √(14)
1.92*10³ / V2 = 3.74
1.92*10³ = 3.74V2
V2 = 1920 / 3.74
V2 = 513.36m/s
The velocity of Nitrogen molecule is 513.36m/s
How many joules are produced when 45 gram of copper is placed into water that releases them temperature from 12c to 71c (c)=0.75j/g*c
Answer:
Heat energy (Q) = 1.9925 KJ = 2 KJ (Approx)
Explanation:
Given:
Mass of copper (M) = 45 gram
Change in temperature (ΔT) = 71°C - 12°C = 59°C
Specific heat (c) =0.75 j /g*c
Find:
Heat energy (Q) = ?
Computation:
Heat energy (Q) = Mass(M) × Change in temperature (ΔT) × Specific heat (c)
Heat energy (Q) = 45 gram × 59°C × 0.75 j /g*c
Heat energy (Q) = 1991.25 J
Heat energy (Q) = 1.9925 KJ = 2 KJ (Approx)
Why is soap mixed with water?
O A. The soap turns the water molecules into a nonpolar solvent.
B. It covalently bonds to the water so it can be washed away.
O C. Its polar end mixes with the water so it can be washed away.
D. The soap becomes chemically active when mixed with water.
Answer:
Explanation:
Soap breaks up the oil into smaller drops, which can mix with the water. It works because soap is made up of molecules with two very different ends. One end of soap molecules love water - they are hydrophilic. The other end of soap molecues hate water - they are hydrophobic.
Answer:
C. Its polar end mixes with the water so it can be washed away.
Explanation:
Just took test
When water changes into water vapor, this is called_______.
A) condensation
B) transpiration
C) precipitation
D) evaporation
Answer:
Evaporation
Explanation:
Evaporation turns liquid water into a gas called water vapor. If heat is taken away from water vapor, it condenses. Condensation turns water vapor into a liquid. If heat is taken away from liquid water, it freezes to become ice.
Answer:
D
Explanation:
Which substance should a student apply to the skin if he or she gets splashed with an acid?
How much would this compound weight
Answer:98g/mol
Explanation:
Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply
the number of orange candies divided by total number of candies
the mass of orange candies divided by total mass of candies
the volume of brown candies divided by volume of orange candies
the actual number of orange candies
the number of orange candies divided by number of brown candies
the number of orange candies plus number of brown candies
Answer:
the number of orange candies divided by total number of candies
the mass of orange candies divided by total mass of candies
Explanation:
The two correct options that are appropriate to describe the concentration of orange candies would be the number of orange candies divided by total number of candies and the mass of orange candies divided by total mass of candies.
The concentration of a substance can be described as the fraction of that substance in a particular mix of substances.
In term of number, the concentration of a substance in a mix of substances can be expressed as the number of that substance divided by the total number of substances in the mix.
In term of mass, the concentration of a substance in a mix of substances can be expressed as the mass of that substance divided by the total mass of the mix.
Answer:
A, B, E
Explanation:
edge
Multiply the following: (1.25 x 10^15) x (3.75 x 10^5).
Answer:
[tex]4.6875x10^20[/tex]
Explanation:
A balloon filled with air has a volume of 6.50 L, a pressure of 0.900 atm, and a temperature of 25.0oC. If it is left out overnight, during which the temperature decreases to 15.0oC and the pressure rises to 1.15 atm, what will the volume of the balloon be?
Answer:
4.92 L
Explanation:
Rearrange ideal gas law and solve.
Change C to K.
- Hope that helps! Please let me know if you need further explanation.
What is one thing NOT impacted by Acid
Rain.
A)Granite
B)Metal
C)Limestone
List three facts or accomplishments of Modern India (India today)
Answer:
India is one of the oldest countries in the world and is found in the Asian continent of the world.
They are known as the most populous country in the world.
They also have a greater linguistic diversity than any other large country. Lots of languages are available and accepted in the country.
They are very vast in Agriculture and accounts for 40percent of Mango production in the world
Explanation:
India is the largest producer. India is also the world's largest tea and spices producer. The country manufactures many pharmaceuticals, textiles, and electric goods that are used worldwide. More people in India have access to phones than to sewage systems.
what happens to the density of a box full of leaves if you crush up all the leaves and place them in another box
A the density increases
B the density stays the same
C the density decreases
D the density first decreases, then increases
Answer:
B the density stays the same
What happens when an object with elastic energy is released?
It uses kinetic energy to return to its original shape
It bounces like a ball
It uses potential energy to return to its original shape
It uses elastic energy to return to its original shape
Answer:
It uses kinetic energy to return to its original shape
how many Atoms of chlorine Cl are there in 3.45 mol Cl?
Answer:
2.078x10^24
Explanation:
No. of atoms of chlorine = 3.45 x 6.022x 10 ^23 x 1
= 2.078x10^24
( to find no. of atoms of, heres the formula i was taught No. of atoms = no. of moles x Avogadros constant x no. of atoms in the formula of compound)
How much of this reactant should he order to make
sure he runs out of both reactants at the same
time? Round to the nearest hundredth and do not
round any of your work until the very end.
g of the limiting
He should uder
reactant.
Answer:
the answer is Fe2O3
Explanation:
The thermite reaction is described by the equation below: A welder has ... How much of this reactant should he order to make sure he runs out of both reactants at the same time? Round to the nearest hundredth and do not round any of your work until the very end. He should order Fe2O3 g of the limiting reactant.
Answer:
92.41g
Explanation:
A typical cell phone uses wavelength of 0.36meters. How much energy does this wave have?
Answer:
55×10^-26 J
Explanation:
We can calculate the energy of the wave from
E= hc/λ
Where
h= Planks constant = 6.6×10^-34 Is
c= speed of light = 3×10^8 ms-1
λ= wavelength of the wave = 0.36 metres
Recall that cell phone use radio waves which belong to the electromagnetic spectrum hence it must possess the speed of light.
E= 6.6×10^-34 × 3×10^8/ 0.36
E= 55×10^-26 J
Hence the energy possessed by 0.36 meters wavelength radio waves is 55×10^-26 J
An organelle found in plant cells,fungi and some protist, animal cells, and bacteria is the
Answer:
Vacuole
EXPLAINATION?:
A vacuole is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal and bacterial cells.
the same :/
Answer:
Vacuole
Explanation:
Name some uses of Chlorine and bromine compounds
Answer:
kii
Explanation:
Fiona is examining a material. She notices that the material has a dull appearance and feels very brittle.
Fiona is most likely examining a _______
(I'll give brainliest)
"Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides." - Wikipedia
how many moles of solute are present in 50.0 ml of 0.20 m kno3
Answer: Volume = 50.0 mL in liters : 50.0 / 1000 = 0.05 L
n = M x V
n = 0.20 x 0.05
n = 0.01 moles of solute
Explanation:
The number of moles of solute are present in 50.0 mL of 0.20 M of KNO₃ solution is 0.01 moles.
How do we calculate moles?Moles will be calculated by using the molarity formula because molarity is define as the no. of moles of solute present in per liter of the solution as:
M = n/V, where
M = molarity of KNO₃ = 0.2 M
V = volume of solution = 50mL = 0.05L
Moles will be calculated as:
n = (0.2)(0.05) = 0.01 moles
Hence required moles are 0.01 moles.
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What happens to Cr3+ ion when it
is converted to Cro42-
Its oxidation number decreases and undergoes reduction
The reaction for the combustion of methane is shown below. If 28.70g of methane
reacts with 51.40g of oxygen, how much water will be produced? Record your
answer with 2 decimal places.
CH
+
20,
oxygen
CO2
carbon dioxide
+ 2H,0
water
methane
Answer:
2.888mm needs for the reaction
