Answer:
0.008 ÷ 51.3 = 0.00015594541910331380.00015594541910331382Round 0.0001559454191033138 → 0.0002 (Sig Figs: 1)
Kevin is working on a model that shows the positions of Earth, the Moon, and the Sun during the phases of the Moon. How should he position them to show a New Moon?
Which statement is true? a. Energy is capability of doing work b. A cup of water has kinetic energy c. Kinetic energy is stored energy in substances. d. Potential energy is enery in motion. e. Heat and electricity are different forms of energy
Answer:
Option A an E.
Explanation:
Energy can be described as the capability to do work. It is what has to be transferred to an object in order to get this object to do work. Energy can be in various forms such as heat energy, kinetic, potential, electrical, chemical, nuclear etc.
It takes energy to do quite a number of things, from cooking food to driving and also in engaging in exercises.
11.7 g of NaCl and 4.5 g of KBr were dissolved
in 47 g of water. What is the molality of NaCl
in the solution?
Answer:
4.26m
Explanation:
Molality , m, is an unit of concentration in chemistry defined as the ratio between moles of solute (In this case, NaCl) and kg of solvent (In this case, water).
To solve the question we need to find the moles of NaCl and the mass of water in kg:
Moles NaCl -Molar mass: 58.44g/mol-:
11.7g * (1mol / 58.44g) = 0.200 moles
Mass of Water in kg:
47g * (1kg / 1000g) = 0.047kg
Molality is:
0.200 moles / 0.047kg =
4.26m
Which rate law is consistent with the mechanism?
Question 1 (1 point)
A party balloon is filled up under the following conditions: 1.1 atm 65°C, 1,55 liters. Then, the balloon is taken to an outdoor wedding with
sightly different conditions: 1.2 atm and 92°C. What is the new size of the balloon?
Do not enter a unit, just the number
Round your answer to 2 sig figs.
Answer:
.5
Explanation:
Answer:
1.5
Explanation:
1.5
periodic table
fill in the box :)
Answer:
I took a screen shot of your image, and wrote on top of it!
Explanation:
Hope this helps! :)
hi help plz .........
Answer:The answer is C) The total mass of C and D only.
If 2.50 grams of ethane is allowed to react with 5.00 grams of oxygen how many grams of water would be expected?
Answer:
The mass of water produced is 4.29 g.
Explanation:
Given;
reacting mass of ethane, C₂H₆ = 2.5 g
reacting mass of oxygen, O₂ = 5.0 g
The balanced combustion reaction is given as follows;
2C₂H₆ + 7O₂ ----------------> 4CO₂ + 6H₂O
Based on the balanced equation above;
requires
7.0 moles of oxygen -----------------------> 2.0 moles of ethane
requires
5.0 g of oxygen --------------------------> x gram of ethane
x = (2 x 5) / 7
x = 1.43 g
Ethane is in excess of 1.07g (2.5 g - 1.43g)
Now, determine the mass of water produced by 1.43 g of ethane;
requires
2.0 moles of ethane -----------------------> 6.0 moles of water
requires
1.43 g of ethane --------------------------> y gram of water
y = (6 x 1.43) / 2
y = 4.29 g
Therefore, the mass of water produced is 4.29 g.
What is the mass of 5.80 × 10²³ atoms of silver (Ag)?
A. 0.00893 g
B. 0.00963 g
C. 104 g
D. 112 g
Answer:
104 g
Explanation:
i just solved it
What is an Oxidizing Agent? ( answer in simple language)
Answer:
an agent that helps accept electrons on others like oxygen, halogens
Explanation:
a substance that tends to bring about oxidation by being reduced and gaining electrons.
Please mark me as brainliest
How many electron shells does a neon atom have?
Answer:
2 electron shells
hope it helps
and your day will be full of happiness
ANSWER FAST
is water wet?
a.) yes
b.) no
c.) a baby goat is a kid
Answer:
c
Explanation:
What do acids do in solution?
True or False. Physical changes result in the formation of a new substance.
True or False. A major clue to a chemical change is the formation of a new
substance.
Answer:
1. false
2. true
Explanation:
I hope this helps
An atom of a mystery element contains 6 protons, 6 electrons, and 8 neutrons.
What is the mass number?
Answer:
14
Explanation:
Mass number is just the value of the protons and neutrons added, in this case its 14
mole equations please help me :(
Answer:
A. 0.48mol O2
Explanation:
The balanced equation is given as follows:
2CH3OH + 3O2 → 2CO2 + 4H2O
This shows that 2moles of CH3OH is required to react with 3 moles of O2
If 0.32 moles of CH3OH are reacted, then;
0.32 × 3/2 moles of O2 is required
= 0.96/2
= 0.48mol of O2
If 5 times a number is increased by 4 the result is 19 find the lest possible number that satisfies theses condition
Answer: 3
Explanation: 5 times a number would be 5x, then increase that by 4 is 5x+4. The problem then says 5x + 4 ≥ 19. If we solve for x then we get x ≥ 3 so x has to be greater than or equal to 3, so the smallest number it could be is 3. You can even try any number smaller than 3 and see it doesn't work. even something like 2.9
All of the following are empirical formulas EXCEPT
a) Fe(OH)3
b) Na2SO4
c) N204
d) Sn3(PO4)2
The mass of the Atom is determined mainly by the
a) mass of the neutrons
b) mass of the neutrons and protons
c) mass of the electrons
d) mass of the electrons and neutrons
Answer:
B.mass of the neutrons and protons
Explanation:
hope it's help..
Silver has a density of 10.5 grams/cm3. What would be the mass of a 5 cm3 piece of sliver
Answer:
52.5 g
Explanation:
Density= mass/volume
Rearranging the equation gives us m= d(V)
m= d(V)
m= (10.5 grams/cm^3)(5 cm^3)
m= 52.5 g
HELPP ILL GUVE YOU LOTS OF POINTS EVERYTHING U WANT I REALLY NEED HELP
Answer:
finally found
31th July 2000
menciona tres ejemplos en los que un cálculo incorrecto en los en ingredientes indispensables para la elaboración de un producto traería consecuencias graves químicamente hablando
Explanation:
Cada producto o servicio, independientemente de su propósito, debe ser seguro de usar y desarrollado de acuerdo con los más altos estándares de calidad y seguridad.
Algunos ejemplos de cálculo incorrecto de ingredientes que tendrían graves consecuencias químicas podrían ser:
Medicamentos y vacunas: Este es quizás uno de los ejemplos que tendría las consecuencias más graves para las personas si hubiera un cálculo incorrecto de ingredientes, ya que la producción de medicamentos y vacunas es una industria que requiere la máxima calidad agregada debido a que se ocupa directamente de la salud y los errores de formulación pueden agravar la enfermedad y causar la muerte. Actualmente tenemos el ejemplo de la vacuna para el control de la pandemia, que antes de ser aprobada tuvo que someterse a una serie de investigaciones, pruebas en humanos y diferentes fases para demostrar su efectividad y no causar daño al organismo humano.
Cosméticos: Existen cosméticos de la industria de la belleza que tienen la función de prevenir el envejecimiento cutáneo, alisar el cabello, etc. Por tanto, un cálculo incorrecto de los ingredientes químicos también podría provocar daños irreversibles a la salud, como quemaduras en la piel, caída del cabello, alergias, cáncer, etc.
Alimentos: La industria alimentaria utiliza componentes químicos con el fin de conservar los productos y aumentar la vida útil, por lo que si se usan en cantidades mayores de las necesarias, dichos compuestos pueden causar enfermedades en las personas como intoxicación alimentaria, cáncer, gastritis, etc.
The volume occupied by a certain mass of methane gas (CH4)
at STP is 420 L. What will be its mass in grams at STP?
a
500 g
b 400 g
C 300 g
d None of the above
Answer: 300 g
Explanation: I guessed and got it right
420 liter of volume is occupied by 300 grams of methane gas at standard temperature and pressure (STP).
How we write the ideal gas equation at STP?Ideal gas equation of methane gas at STP (standard temperature pressure) can be written as:
PV = nRT, where
P = pressure = 1 atm
V = volume = 420 L (given)
R = universal gas constant = 0.082 L.atm / k.mole
T = absolute temperature = 273 K
n = no. of moles to find?
Putting all these values in the above equation and calculated for the n:
n = (1 × 420) / (0.082 × 273) = 18.76 moles
Now we calculate mass of methane by the definition of moles as:
n = W/M, where
M = molar mass of methane = 16 g/mole
W = to find?
W = 18.76 × 16 = 300.2 grams or 300grams.
Hence, option (c) is correct i.e. 300 grams of methane occupy 420 L volume.
To know more about ideal gas equation, visit the below link:
https://brainly.com/question/12873752
Cells come from other cells.
Question 2 options:
True
Never
False
Sometimes
Answer:
True
Explanation:
this is part of the cell theory
A solution is prepared by mixing 769 mL of ethanol with 507 mL of water. The molarity of ethanol in the resulting solution is 10.8 M. The density of ethanol at this temperature is 0.7893 g/mL. Calculate the difference in volume between the total volume of water and ethanol that were mixed to prepare the solution and the actual volume of the solution.
Answer:
57 mL
Explanation:
To make things clear, when 769 mL of ethanol were mixed with 507 mL of water, the resulting volume was not (769+507) 1276 mL, but a lower value. This is because of the interactions between liquid molecules.
First we calculate how many grams of ethanol are there in 769 mL, using the given density:
mass = density * volume0.7893 g/mL * 769 mL = 606.97 g ethanolThen we convert 606.97 g of ethanol into moles, using its molar mass:
606.97 g ÷ 46.07 g/mol = 13.17 molNow we calculate the actual volume of the solution, using the definition of molarity:
Volume = Moles / Molarity13.17 mol / 10.8 M = 1.219 LFinally we convert 1.219 L to mL, and calculate the difference in volume:
1.219 L * 1000 = 1219 mL1276 mL - 1219 mL = 57 mLWhat is the most likely oxidation state of nitrogen?
O A. -2
OB. +3
O C. +4
O D.-3
D is the answer -3 m
Identify any incorrect formulas. Explain your answer.
a. Mg2(SO4)3
b. Rb3As
c. BeCl3
d. NaF
Wish I could award more points but I'm running low.
The formula of a compound is written based on the valency of each bonded atoms. The formulas Mg₂(SO₄)₃, Rb₃As are incorrect. Such compounds does not exist.
What is chemical formula?The formula of a chemical compound is written based on the number of atoms participated in bonding. Magnesium is second group element having two valence electrons.
Magnesium thus donates its two electrons into the bonding atom or group. The sulphate group SO₄ have a valency of 2 it gains two electrons from Mg when bonded.
Thus the formula of magnesium sulphate being MgSO₄ and not Mg₂(SO₄)₃. Similarly Rb is a second group metal having two valence electrons. Its valency being two. As is a halogen with valency one. Thus they cannot form a compound like Rb₃As.
Hence, option a and b are incorrect formulas.
To find more about chemical formulas, refer the link below:
https://brainly.com/question/11995171
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Describe how greater distance affects the appearance of an object’s size and brightness
Answer:
Distance also affects the apparent brightness of an object. A distant, but very energetic star can appear dimmer to us than a lower-energy, but closer one. ... Each of their effective temperatures results in a different brightness for the object. The quasar, however, is very far away, and so appears dim.
Explanation:
How many grams of molecular chlorine will be required to completely react with 0.0223 moles of sodium iodide according to the following reaction?
2Nal + Cl2 ---> 2NaCl + I2
A. 1.57 104 grams
B. 3.16 grams
C. 0.0112 grams
D. 0.791 grams
The amount of chlorine will be 0.791 gram required to completely react with 0.0223 moles of sodium iodide .
The given chemical reaction is :
2Nal + [tex]Cl_{2}[/tex] → 2NaCl + [tex]I_{2}[/tex]
It is given that:
Amount of sodium iodide = 0.0223 mol.
Atomic mass of chlorine = 35.45 g.
The amount of chlorine can be calculated as:
0.0223mol. NaI × (1mol. Cl₂/2mol. NaI) × (35.45g/1mol. Cl2)
=0.791 grams
Therefore, the correct answer will be option (D).
To know more about sodium chloride.
https://brainly.com/question/20273068
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Chemistry Challenge
Imagine someone who had never seen a city before.
They have lived their entire life alone, in a cave.
Answer
How could you get them to understand a city without
taking them there?
.
Students, write your response!
Pear Deck Interactive Slide
Do not remove this bar
Answer:
I will draw how the city looks like