Why do chemists need a number as large as the mole?
Answers
Explanation:
You can easily approximate the number of atoms from the mass of a sample because the mass number of an isotope approximately equals the mass of 1 mole of atoms in grams. It's a historical convention that would be too expensive or uncomfortable to change now.
Answer:
That's why chemists used large number of moles
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Related Questions
What color was the filter used in the experiment?
A.blue
B.purple
C.yellow
D.black
Answers
Answer:
You have to show us a picture of the filter or experiment
2. (10 Points) If something has a high heat capacity will it take a little energy or a
lot of energy to change its temperature? Defend your answer.
Answers
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wtjfavyw
Which of these is evidence that an unbalanced force is acting on an object?
The motion of the object is changing
The mass of the object is changing.
The object continues moving in a straight line
The object remains at rest.
Answers
Answer:
The motion of the object is changing
Explanation:
Objects will only change their motion (direction, speed) if there is an unbalanced force of some kind acting on them. Balanced forces result in no change in the object's state of motion.
The motion of the object is changing.
Objects will only change their motion (direction, speed) if there is an unbalanced force of some kind acting on them. Balanced forces result in no change in the object's state of motion.
What is motion ?
"Change with time of the position or orientation of a body. Motion along a line or a curve is called translation. Motion that changes the orientation of a body is called rotation."
What is force ?"A force is a push or pull upon an object resulting from the object's interaction with another object."
Know more about force here
https://brainly.com/question/13191643
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which is more electronegative? F or N?
Answers
I need help with 5 and 6!!
Answers
Answer:
As the axial tilt increases, then the seasonal contrast increases so that winters are colder and summers are warmer in both hemispheres. The northern hemisphere is tipped away from the Sun, producing short days and a low sun angle. What kind of effect does the earth's tilt and subsequent seasons have on our length of daylight (defined as sunrise to sunset). Over the equator, the answer is not much.
As for #5, it's mixed at the end of my answer, but just remember the spring equinox marks the change from 24 hours of darkness to 24 hours of daylight at Earth's poles .
I'm giving 20 points! please it's for a friend not me
Answers
Answer:
Three chemical elements: hydrogen, oxygen, and helium.
The difference between metals and metalloids is: metalloids have properties in between those of the metals and non-metals and are semiconductors.
The periodic table is organized by the elemts atomic number, it goes from the element with the lowest atomic number (which is hydrogen) to the element with the highest atomic number (oganesson)
Explanation:
Hope this helps :)
Answer: Thank you for the points.
Explanation:
List two factors that affect climate
Answers
Answer:
1. Latitude
2. Ocean currents
Explanation:
When 75 grams of reactants react to completion, the mass of the products will be
Answers
Answer:
75 grams
Explanation:
The law of conservation of mass tells us that the mass of the reactants will be equal to the mass of the products. Therefore, if we begin with 75 grams of mass, that is how much there will be at the end in the products, even if it's in different forms.
Typically, your percent yield is ______ than 100% because ___________________________.
Answers
Reasons why percent yield is more than 100
Typically, percent yields are understandably less than 100% because of the reasons indicated earlier. However, percent yields greater than 100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.
figure it out
Answer:
Explanation:
A
Is copper II chloride mixed with water an element, compound, or mixture? If it's a mixture is it homogeneous or heterogeneous?
Answers
Answer:
1. mixture
2. Homogenous
Explanation:
Copper II chloride is a compound because it consists of elements that are chemically combined together. When a solute in this case, copper II chloride is mixed with water- a solvent, the result is a homogenous mixture.
Homogenous substances are formed when a solute and a solvent combine, resulting in a mixture with uniform properties. Mixtures can be separated using relevant separation techniques.
_N2+_F2→ _NF3
What goes inside the blanks
Answers
Second blank: 3
Third blank: 2
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How much heat is released when 1.4 mol of hydrogen fluoride are produced? H2(g) +F2(g) → 2HF(g) +536kJ (Please show work)
Answers
Answer:
375.2 kJ
Explanation:
H₂(g) +F₂(g) → 2HF(g) +536kJThe information the equation above provides lets us know that when 2 mol of hydrogen fluoride (HF) are produced, 536 kJ of energy (as heat) is produced.
We can then state a rule of three:
2 mol HF -------- 536 kJ1.4 mol HF --------- XAnd solve for X:
X = 1.4 mol * 536 kJ / 2 molX = 375.2 kJ3. To find an object's mechanical energy. you add its A kinetic and potential energy B kinetic and thermal energy C potential and thermale energy D kinetic and chemical energy
Answers
Answer:
A
Explanation:
The formula for mechanical energy is mechanical energy = kinetic energy + potential energy.
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Answers
La densidad del aire contenida en una habitación es 0.0013 g/cm3. si las dimensiones de la habitación son 4m de ancho, 5m de largo y 2.5m de alto, ¿ que nada tiene el aire contenido?
Answers
Answer:
La masa del aire contenido en la habitacion es 65000 gramos.
Explanation:
La densidad se define como la propiedad que tiene la materia, ya sean sólidos, líquidos o gases, para comprimirse en un espacio determinado. En otras palabras, la densidad es una magnitud que permite medir la cantidad de masa que hay en determinado volumen de una sustancia. Entonces, la expresión para el cálculo de la densidad es el cociente entre la masa de un cuerpo y el volumen que ocupa:
[tex]d=\frac{m}{V}[/tex]
En este caso:
d= 0,0013 [tex]\frac{g}{cm^{3} }[/tex]m=?V= 4 m*5 m*2,5 m= 50 m³= 50.000.000 cm³ (siendo 1 m³=1.000.000 cm³)Reemplazando:
[tex]0,0013\frac{g}{cm^{3} }=\frac{m}{50000000 cm^{3} }[/tex]
Resolviendo obtienes:
m= 0,0013 [tex]\frac{g}{cm^{3} }[/tex] * 50.000.000 cm³
m=65000 g
La masa del aire contenido en la habitacion es 65000 gramos.
are fruits and juices acid are base or acids or both
Answers
Answer: Acidic liquids have low pH levels. Many fruit juices qualify as acidic liquids. Some of the more acidic fruit juices are orange juice, lemon juice, grapefruit juice, tomato juice and red currant juice.
Explanation:
Answer:Acids and bases are common substances found in many every day items, from fruit juices and soft drinks to soap. In this chapter, we will examine the properties of acids and bases, and learn about the chemical nature of these important compounds.While a few fruit juices are more acidic than others, many fruit juices share the same level of acidity, and vegetable juices have the lowest amount of acid. Fruit juice is more acidic than vegetable juice.
Explanation: so its both
How many atoms are bound to each carbon atom in the alkanes?
Answers
The Earth is thought to have been formed about 4.6 billion years ago by collisions in the giant disc-shaped cloud of material that also formed the Sun. Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets called ___.
Answers
Answer: dwarf planets
Explanation:
Answer:
planetesimals
Explanation:
these are the building blocks of planets, sometimes called "planetesimals." Scientists think planets, including the ones in our solar system, likely start off as grains of dust smaller than the width of a human hair. They emerge from the giant, donut-shaped disk of gas and dust that circles young stars.
Prove this reaction is a redox reaction
3 Mg + 2 FeCl3 +2 Fe + 3 MgCl2
Your answer should include the half equations
Answers
Answer:
because Redox means two words:reduction and oxidation
reduction is when oxygen is taken from a substance while oxidation is the addition of oxygen to a substance..Magnesium displaces chlorine from iron(fe)because it is more reactive than iron
and iron gives chlorine to magnesium because it's less reactive.This is due to their position on reactivity series.
Explanation:
This is called displacement reaction where by A most reactive metal remove a substance from a less reactive metal and form up a salt
and in this case the salt formed in the reaction is 3MgCl
What happens to that atom of magnesium-24 if it GAINS a NEUTRON? *
Answers
Answer: If this atom loses one electron, it will become a cation with a 1+ charge
Explanation:
Use the following equations to determine the heat of the reaction of:
N2H4(l) + H2(g) --> 2NH3(g) ΔH=?
N2H4(l) + CH4O(l) → CH2O(g) + N2(g) + 3H2(g) ΔH = -37
kJ N2(g) + 3H2(g) → 2NH3(g) ΔH = -46
kJ CH4O(l) → CH2O(g) + H2(g) ΔH = -65 kJ
Answers
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Answer to Question #96220 in Molecular Physics | Thermodynamics for Kaleesh
Answers>Physics>Molecular Physics | Thermodynamics
Question #96220
a) Determine the enthalpy changes, ΔH for the reaction below, given the following reactions and subsequent ΔH values. Please rewrite the amended chemical reaction equation again.
N2H4 (l) + CH4O (l) CH2O (g) + N2 (g) + 3H2 (g)
2NH3 (g) N2H4 (l) + H2 (g) ΔH = 22.5kJ
2NH3 (g) N2 (g) + 3H2 (g) ΔH = 57.5 kJ
CH2O (g) + H2 (g) CH4O (l) ΔH = 81.2 kJ
b) Given that the enthalpy of vaporization for water as below:
H2O (l) H2O (g) ΔH vap = 44.0 kJ mol-1
Calculate enthalpy ΔH for each of the following processes:
i) Evaporating 3.00 moles of water
ii) Evaporating 3.00 grams of water
i) Condensing 20.0 grams of water
(3 Marks)
c) Use the enthalpy of formation data to calculate the enthalpy of the reaction below.
2C2H6 (g) + 7O2 6H2O (g) + 4CO2 (g)
what type of reaction is
CH 4 (g)+2O 2 (g) CO 2 (g)+2H 2 O(g)
Answers
Answer: combustion
Explanation:
Combustion reactions can be identified by looking at the reactants and the products.
Usually, the reactants will be a hydrocarbon and oxygen. And the products will be CO2 and H2O
What is a decay chain?
A. One element decaying into another, which decays into another
B. A list of radioactive substances organized by half-life times
C. An accumulation of particles emitted through radioactive decay
D. A list of radioactive substances organized by atomic weights
Answers
Answer:
A
Explanation:
A. One element decaying into another, which decays into another
Why do our liver cells contain so many smooth ER?
Answers
Answer:
Liver cells contain lots of smooth endoplasmic reticulum because the liver plays a big role in detoxification. So, if you've had a few too many glasses of wine, it's the smooth endoplasmic reticulum in your liver that's helping move things along the next morning
Explanation:
explain why the fingertip and not the palm of the hand is used to detect braille symbols
Answers
Answer:
The Braille is the dots arranged in cell to identify the letter, number and symbols. the Braille system is identified using the fingers. the fingertip is used for identifying the nature of number and symbol. the difference is made by detecting the number and symbol.
Explanation:
Hope this helped Mark BRAINLEST!!!!
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Answers
my opinion is guess and hope Explanation:
1. (10 Points) When you boil water in a pan on the stove which heats faster the
pan or the water? Defend your answer.
Answers
The pan would heat faster because in order for the water to get hot the pan needs to be hot as well.
How does the velocity of a falling object change over time?
Answers
If we put some water in a plate and allow the plate and allow the plate to lie in sunlight we find that water from the plate disappear moreover even if we keep the plate in the shade it still disappear
Answers
Answer:
Evaporation
Explanation:
Evaporation is the process by which water changes from the liquid state to the gaseous state.
Unlike boiling that only occurs at a specific temperature (boiling point), evaporation occurs at any temperature. This explains why water disappear when placed under direct sunlight or under a shade.
Which part of the flower produces seeds? (992 points)
a
Ovule
b
Pistil
c
Stamen
d
Stigma
Answers
Answer:
The pistil, B.
Explanation:
The seeds are formed from the ovule which is contained in the ovary; all in the base, the pistil.