Answer:
The answer is 54.2 seconds
Explanation:
If you divide 542 by 10 you get 54.2 which is then labeled as seconds.
Give the boiling point elevation for the following: 150 grams of H2SO4 dissolved in 2.5 kg of H2O (i=2)
Answer: b
Explanation:
Se ard 25g de magneziu de puritate 90%. Ce volum de oxigen se consumă și câti moli dioxid de magneziu se formează
Answer:
10.5 dm3 O2
0.94 moles de MgO
Explanation:
La pregunta dice explícitamente que el magnesio es puro en un 90%.
Por lo tanto, masa de magnesio puro = 90/100 * 25G = 22,5 g
Número de moles de Mg = 22,5g / 24g/mol = 0,94 moles de Mg
La ecuación de reacción es;
2Mg (s) + O2 (g) ------> 2MgO (s)
Si 2 moles de Mg reaccionan con 1 moles de O2
0.94 moles de Mg reacciona con 0.94 * 1/2 = 0.47 moles de O2
Si 1 mol de O2 ocupa 22,4 dm3
0.47 moles de O2 ocupan 0.47 * 22.4 / 1 = 10.5 dm3
También;
2 moles de Mg producen 2 moles de MgO
Entonces, 0.94 moles de Mg producen 0.94 moles de MgO
In a 63.17 g sample of SOs, how many grams are sulfur?
Answer:
25.30 gram
Explanation:
No of moles = given mass / molar mass
No of moles = 63.17/80.06
0.7890 moles
Mass of sulphar = no of moles× molar mass of sulphar
Mass of sulphur = 0.7890×32.065
25.30 gram
Please I need this help me
Answer:
first of all is that really chemistry
Which of the following correctly describes the difference (on average) between an electron in a 2s orbital and an electron in a 3s orbital?
Answer:
C: electrons is the 3s orbital are higher than those in the 2s orbital
Explanation:
Looking at the options, the correct one is that the electrons in the 3s orbital will possess more energy than those in the 2s orbital. This is because the the 2s orbitals will be filled with electrons first before the 3s orbital.
Also from basics we know that the energy of an orbital increases as the quantum number increases.
A protein is a polymer that is made of
Answer:
A protein is a polymer that is made of amino acids.
If a 2,000-kilogram car accelerates at a rate of 3 meters per second squared,
what is the force the engine applied to the car?
HELP
Answer:
Explanation:
assuming there is no friction
fnet=ma
2,000 kg*3m/s=6,000 N
What is the electron configuration for nickel (Ni)?
The Periodic Table
A. 1522s22p63523p640408
O B. 1s22s22p63s23p64dB
C. 1922s22p63s23p3 dB
O D. 1922s22p63523p63.10
HELP!!
Determine el número de moles presentes en una esfera de titaniode 0.5 cm de radio, sabiendo que la densidad del titanio es de 4507kg/m³. =433
Answer:
0.0493 moles de Titanio
Explanation:
Primero, debemos hallar el volumen de la esfera. Usando la densidad podemos hallar la masa de titanio y usando la masa atómica encontraremos las moles de titanio:
Volumen de la esfera:
Volumen esfera = 4/3π * Radio³
Volumen = 0.5236cm³
En m³ (1m³ = 1x10⁶cm³):
0.5236cm³ * (1m³ / 1x10⁶cm³) = 5.36x10⁻⁷m³
Masa en gramos:
5.36x10⁻⁷m³ * (4507kg / m³) = 2.36x10⁻³kg * (1000g / 1kg) = 2.36g de Titanio
Moles -Masa molar Ti: 47.867g/mol-:
2.36g de Titanio * (1mol / 47.867g) =
0.0493 moles de TitanioWhat provides the energy to set the water cycle in motion?
Nothing, the water cycle does not need energy.
Clouds
Sun
Water.
If 11.87 grams of sand (SiO2) were contained in the mixture, how many atoms of oxygen were in the mixture?
Answer:
2.38x10²³ atoms oxygen
Explanation:
To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:
Moles SiO₂:
11.87g * (1mol / 60.08g) = 0.1976moles SiO₂
Moles Oxygen:
0.1976moles SiO₂* 2 = 0.3951moles oxygen
Atoms oxygen:
0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =
2.38x10²³ atoms oxygenPlease help due today!
for the first one it is B OR THE SECOND OPTION
What is the relationship between atoms and mass?
Answer:
Explanation:
A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu.
The molar mass of H2O is 18.02 g/mol. How many moles of H20 are
present in 2.15 x 10^24 molecules?
Answer:
3.57moles
Explanation:
The number of moles in a compound can be got from the number of molecules it contains.
Since;
number of moles (n) = number of molecules (nA) ÷ Avagadro's number
Avagadro's number = 6.02 × 10^23 molecules
H20 contains 2.15 x 10^24 molecules, according to this question. Therefore,
n = 2.15 x 10^24 ÷ 6.02 × 10^23
n = 0.357 × 10^(24-23)
n = 0.357 × 10^1
n = 3.57moles
Hence, 3.57moles are present in in 2.15 x 10^24 molecules of H2O.
AgNO3 (aq) +
Cu(s) —
Cu(NO3)2 (aq) +
| Ag(s)
What is the integer?
Answer:
2
Explanation:
2AgNO3 + Cu -----> Cu(NO3)2. + 2Ag
Explain how mass extinctions occur.
Answer:
Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes.
Explanation:
6 grams of sodium chloride (NaCl) is dissolved to create 0.5 L of solution. What is the
molarity of this solution?
Answer:
0.206M
Explanation:
Molarity, which refers to the molar concentration of a substance can be calculated using the formula as follows:
Molarity (M) = number of moles (n) ÷ volume (V)
According to the provided information, mass = 6grams, volume = 0.5L
Since molar mass of NaCl = 23 + 35.5
= 58.5g/lol
Mole = mass/molar mass
Mole = 6/58.5
Mole = 0.103mol
Hence;
Molarity = 0.103/0.5
Molarity = 0.206M
When white light passes through a prism, what can be discovered?
A)
White light is made invisible by passing through prisms.
B)
White light is made brighter by passing through prisms.
White light is made of a spectrum of various colors.
D)
White light gets hotter when it passes through prisms.
Answer:
White light is made of a spectrum of various colors.
Explanation:
As light passes through a prism, it is bent, or refracted, by the angles and plane faces of the prism and each wavelength of light is refracted by a slightly different amount. ... As a result, all of the colors in the white light of the sun separate into the individual bands of color characteristic of a rainbow.
Which characteristic of living organisms is described by the following definition? "The ability
to detect changes in the environment and make responses".
1. nutrition
2. sensitivity
3.movement
excretions
Answer:
it's sensitivity
Explanation:
because it's the action of sensing and reacting to something
also it was process of elimination
You have 2000 g of radioactive substance with a half-life of 100 years four half-lives go by how many grams do you have the radioactive substance do you have left
Answer:
after 4 half-lives, 125g is left
Explanation:
The half-life of a radioactive substance is the time it takes for the substance to decay by half its original mass.
In this example, we are asked to find the remaining mass after four half-lives.
What we will simply do is to reduce the starting mass by half, after each half-life decay. this is done as follows:
1st half-life decay: starting mass 2000g
final mass = 2000g ÷ 2 = 1000g
2nd half-life decay: starting mass = 1000g
final mass = 1000 ÷ 2 = 500
3rd half-life decay: starting mass = 500
final mass = 500 ÷ 2 = 250g
4th half-life decay: starting mass = 250g
final mass = 250 ÷ 2 = 125g
∴ after 4 half lives, 125g is left
Help me please What makes water filters better
Answer:
well according to salesman they take out all and out all bacteria that is in the water that the water filters installed in the systems already don't take out so in other wordsthere and the water filter takes that out
2. How much force, in g cm / s2 , is exerted by a golf ball described in problem 1 striking a tree while accelerating at 20 cm / s2 ? Show how you can solve this problem without knowing that F = m a. Explain your solution.
Answer:
F = 1000 g cm/s²
Explanation:
Let the weight of 1 ball is 50 gram
Acceleration, a = 20 cm/s²
We need to find the force exerted by a golf ball. We know that,
F = ma
So,
F = 50 g × 20 cm/s²
F = 1000 g cm/s²
So, the required force is 1000 g cm/s².
A tank for storing liquid as a base of area 1.5 meters square. What is the pressure on the base of the tank when it contains water weighting 4500n
Answer:
3000 Nm^2
Explanation:
We must remember that pressure is defined as force per unit area.
We have been given the following information in the question;
Area of the tank= 1.5 m^2
Weight of water in the tank = 4500N
And;
P = F/A
F= force
A = area
P = 4500 N/1.5m^2
P= 3000 Nm^2
How can scientists control the flammability of a substance?
Answer: This is simple, if it has a high flammability, and you light it on fire, then that would be a chemical change.
Explanation:
May i have brainliest please and don't forget to drop a heart
Two atoms with different numbers of protons are what?
a)two different isotopes
b)two different ions
c)two different elements
Answer:
c) two different elements
Explanation:
A periodic table can be defined as the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.
Generally, a proper representation of the mass number and atomic number of chemical elements is key and very important in chemistry.
Furthermore, as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton).
In the periodic table, all chemical elements are identified based on number of protons because it represents the atomic number.
This ultimately implies that, numbers of protons (atomic numbers) is used to differentiate an atom of one chemical element from the atom of another chemical element.
Hence, two atoms with different numbers of protons are two different elements.
For example, Hydrogen has one proton while Oxygen has 8 protons.
What Classification type star this?
Explanation:
The Sun is a as a G2V type star, a yellow dwarf and a main sequence star. Stars are classified by their spectra (the elements that they absorb) and their temperature.
whish this helped!
The formula of methane is CH4. The symbols for the two elements in methane are C and H. Give the names of these two elements.
Answer:
Carbon and Hydrogen
Explanation:
So the C stands for Carbon and H is for Hydrogen. Methane (CH4) is made up of one atom of Carbon and 4 atoms of Hydrogen.
Hope this helps
What are the end products of anaerobic respiration in yeast cell ?
Answer:
glucose ethanol and co2
please follow me and mark it brainliest
Answer:
In anaerobic respiration yeast breaks down glucose, forming ethanol and carbon dioxide as its waste products. When the glucose is nearly used up, and provided that oxygen is present, yeast uses the ethanol as a respiratory substrate to produce carbon dioxide and water in aerobic respiration.
Explanation:
Hope it is helpful....
Which organism in the food chain is
responsible for transforming radiant
energy into chemical energy?
Grass->Prairie Dog -> Coyote -> Soil Bacteria
Answer:
The organism in the food chain responsible for transforming radiant energy into chemical energy is;
Grass
Explanation:
Radiant energy is the energy present in electromagnetic waves which carry photons that may be considered as energy packets. It is an energy present in the Sunlight, which is an electromagnetic waves, and it is the energy in the electromagnetic waves that plants convert to chemical energy for food in the process known as photosynthesis as follows;
6CO₂ + H₂O + Radiant energy → C₆H₁₂O₆ + 6O₂
Therefore the organism in the food chain responsible for transforming radiant energy into chemical energy is the plant, grass
Which of the following explains this observation?
A. Sound has longer wavelengths than light
B. Light has a greater mass than sound
C. Light travels faster than sound
D. Sound and light travel at the same speed