Answer:
12 atoms
C-12.thats all
How many molecules are in 83.2 g of chlorine gas (Cl2)?
Group of answer choices
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Answer:
Try everything or guess, that will always work
1.42 x 10^24 molecules
1.78 x 10^28 molecules
7.04 x 10^23 molecules
14.2 x 10^24 molecules
Explanation:
A solution has [H+] = 7.65*10^-3 what is the [OH-] in the solution?
Answer:
The hydroxide ion concentration in an aqueous solution, [OH-], in mol L-1, can be calculated if the pOH of the solution is known.
pOH is defined as the negative logarithm (to base 10) of the hydroxide ion concentration in mol L-1 pOH = -log10[OH-]
Explanation:
Which of the following is/are true regarding chemical
nomenclature?
A. All elements in a compound must be included
in the name.
B. Ionic and molecular nomenclature have
different rules.
C. A formula for an ionic compound is written
with the cation first followed by the anion.
D. A chemical formula must always be reduced to
the lowest whole number ratio.
Answer:
c
Explanation:
i took the quiz
Oliver builds a circuit connecting a light bulb to a battery with wires, leaving a gap in one of the wires. He places several objects across the gap to close the loop. He wants to see which objects allow electricity to flow and turn on the light bulb. Why do some materials allow electricity to flow through while others do not?
Plz help
A. Electricity will flow if the atoms in the material are bound tightly to each other.
B. Electricity will flow if the atoms in the material are bound loosely to each other.
C. Electricity will flow if the electrons are bound tightly to their atoms in the material.
D. Electricity will flow if the electrons are bound loosely to their atoms in the material.
Answer:
It is c
Explanation:
The specific heat of liquid H2O is 4.184 J/g°C. If 32.7 grams of water are heated from
12 °C to 77 °C, how much energy is required?
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
8893.092J
Explanation:
energy= mass × specific heat capacity of water × change in temperature
=32.7×4.184×(77-12)
=8893.092J
hiii please help i’ll give brainliest
Answer:
the applied force is greater than the force of friction
Explanation:
Most gases exist as molecules, for example, fluorine is F2.
Explain why the elements in Group 0 exist as single atoms.
Group 0 is the noble gas elements in periodic table. They are all unreactive because, they have completely filled electronic configuration and thus they are stable. This stability to be a single element make them so.
What are noble gases?Noble gases are helium, neon, argon, krypton and xenon. They are 18th group elements in periodic table. Also called zero group elements. The general electronic configuration of these elements is ns² np⁶.
Noble gases contains eight electrons in their valence shell and thus completed octet. Atoms with less number of electrons in valence shell tends to attain octet by losing or gaining electrons to their valence shell.
Every elements except noble gases are electron deficient or electron rich. The electron rich elements will lose their electron to attain stability and the elements with less electrons gain them through bonding. That's why they are existing as molecules.
Therefore, the elements of zero group are highly stable and they do not lose or gain electrons to form molecules.
To find more about noble gases, refer the link below:
https://brainly.com/question/11764545
#SPJ2
1) El CO2 que los astronautas exhalan se extrae de la atmósfera de la nave espacial por reacción con KOH según la reacción: CO2 (g) + 2 KOH (l) → K2CO3 (s) + H2O (l) a) Cúantos gramos de CO2 se pueden extraer con 500 g de KOH ? b) Cuántos gramos de agua se producen? 2) Cuando se hacen reaccionar hidrógeno y nitrógeno se produce amoniaco, un fertilizante benéfico para las plantas. ¿Cuántos moles de hidrógeno se requieren para que reaccionen con 12.75 moles de nitrógeno? La reacción es la siguiente: N2 + 3 H2 → 2NH3 3) El propano (C3H8) es usado como combustible en los hogares, reacciona con el oxigeno para producir dióxido de carbono (CO2) y agua (H2O) mediante la siguiente reacción: C3H8 + 5 O2 → 3 CO2 + 4 H2O a) Si se queman 2 Litros de propano (C3H8) calcula los litros de CO2 que se emiten a la atmósfera.
Answer:
a. 4.46 moles de CO₂
b. 80.2 g de H₂O
38.25 moles de H₂
5.55 L de dióxido de carbono
Explanation:
Comenzamos con la reacción: CO₂ (g) + 2 KOH (l) → K₂CO₃ ↓ (s) + H₂O (l)
a. Podemos ver que la relación estequiométrica es 2 a 1.
Pasamos la masa de KOH a moles → 500 g . 1mol/ 56.1g = 8.91 moles
2 moles de KOH necesitan 1 mol de dióxido
Entonces, 8.91 moles necesitarán (8.91 . 1)/2 = 4.46 moles
Convertimos los moles en masa → 4.46 mol . 44g /1mol = 196 g de CO₂
b. Como no tenemos información de los reactivos, trabajamos con el KOH (recorda que siempre hacemos los cálculos con el reactivo limitante).
La relacion estequiometrica también es 2 a 1.
Con 2 moles de KOH producimos 1 mol de agua
Entonces 8.91 moles producirán la mitad, 4.46 moles
Pasamos a gramos → 4.46 mol . 18g /1mol = 80.2 g de H₂O
N₂ + 3H₂ → 2NH₃
En esta relacion, la relación de moles es 1 a 3.
1 mol de N₂ necesita 3 moles de H₂ para llevar a cabo la reacción
12.75 moles de nitrogeno reaccionarán con (12.75 . 3)/ 1 = 38.25 moles de H₂
La siguiente es una reacción de combustión:
C₃H₈ + 5O₂ → 3 CO₂ + 4 H₂O
Como en este caso tenemos volumen, necesitamos averiguar la densidad del propano para sacar la masa y de ahi los moles:
Densidad del propano es 1.83 g/L
Si tenemos 2 Litros de gas, entonces tendremos el doble de masa
2L . 1.83 g/L = 3.66 g
Convertimos a moles → 3.66 g . 1 mol/44g = 0.083 moles
1 mol de propano produce 3 moles de dióxido.
0.083 moles producirán (0.083 .3) /1 = 0.249 moles
Convertimos a gramos → 0.249 moles . 44g/ 1mol = 10.98 g
La densidad del CO₂ es 1.976 g/L
d = m/V → V = m/d → 10.98 g / 1.976 L = 5.55 L
Write the combustion equation for propane (C3H8). What is the sum of the coefficients for the reactants and products? Group of answer choices 13 14 10 11 12
Answer:
13
Explanation:
Let's consider the unbalanced equation for the combustion of propane.
C₃H₈ + O₂ ⇒ CO₂ + H₂O
We will begin balancing H atoms by multiplying H₂O by 4.
C₃H₈ + O₂ ⇒ CO₂ + 4 H₂O
Now, we balance C atoms by multiplying CO₂ by 3.
C₃H₈ + O₂ ⇒ 3 CO₂ + 4 H₂O
Finally, we get the balanced equation multiplying O₂ by 5.
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O
The sum of the coefficients is 1 + 5 + 3 + 4 = 13.
9. Do all enzymes function at the same pH?
Each enzyme has an optimum pH but it also has a working range of pH values at which it will still work well. This depends on the type of enzyme. The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. ... Catalase has an optimum pH of 9 and a working range of between pH 7-11. Hope this was helpful
Explanation:
In which location would fishermen most likely catch a greater number of fish?
O A. at the shoreline
B. in an upwelling
C. in the intertidal zone
D. on the deep-ocean floor
where do genes come form?
Answer:
im rly good with this stuff and i'm working on genetics and phenotypes and stuff.
Explanation:
information that determines your traits basically from your parents
What is invection or the definition
Answer:
here are some synonyms of invective are abuse, billingsgate, obloquy, and vituperation.
2. If the direction of an applied force is changed once, to what was the force applied?
A. a compound machine
B. a heat engine
C. an electrical machine
D. a simple machine
Answer:
the answer is( D)a simple machine
On the periodic table, all of the cards in each row (across) have the same what?
The diagram below shows the different phase transitions that occur in matter.
Solid
3
Liquid
16
Gas
Which arrow represents the transition in which dew is formed?
1
O2
4
6
Answer:
C.4
Explanation:
The arrow 4 represents the transition in which dew is formed.
What is Dew?This is formed as a result of condensation which takes place in the morning or evening and is usually seen on exposed surfaces as water droplets.
The air particles in the form of vapor under low temperatures results in the formation of the substance. The arrow 4 thereby depicts it and makes it the most appropriate choice.,
Read more about Dew here https://brainly.com/question/2696211
Which of the following is not a benefit of using biofuels instead of fossil
fuels?
A. Biofuels produce less carbon dioxide when combusted.
B. Biofuels are more sustainable than fossil fuels.
C. Biofuels are renewable.
D. Fossil fuels may be used in the production of biofuels,
Answer: Fossil fuels may be used in the production of biofuels.
Explanation: Defeats the purpose of using biofuels over fossil fuels if one contains the other.
Answer:
D
Biofuel Disadvantages:
Labor costs are high, and storage space is limited. Excessive water use, particularly in dry areas. Increasing biomass for biofuel production raises agricultural land requirements.
What temperature kelvin would .97mol of gas be to occupy 26L at 751.2mmHg?
Answer: 322.56 Kelvin
Explanation:
Use the Ideal Gas Law
[tex]PV=nRT[/tex]
R is the gas constant
T is the temperature in Kelvins
P is the pressure in atmospheres
V is the volume in liters
n is the number of moles of gas
First, the mm of mercury need to be converted to atmospheres using the conversion factor 1atm = 760 torr.
[tex]751.2mmHg (torr) =0.988atm[/tex]
Now plug everything in
[tex](0.988)(26)=(0.97)(0.0821)T\\T=322.56K[/tex]
A sample of neon gas occupies a volume of 752 mL at 25 degrees Celsius. What volume will the gas occupy at -10 degrees Celsius?
Answer:
New volume v2 = 300.8 ml
Explanation:
Given:
Old volume v1 = 752 ml
Old temperature T1 = 25°C
New temperature T2 = -10°C
Find:
New volume v2
Computation:
Using Ideal gas law formula
V1T2 = V2T1
(752)(-10) = (V2)(25)
New volume v2 = 300.8 ml
what are the reactions in a chemical reaction
A. the new substances that are produced
B. the substances that interact
C. the catalysts
D. the chemical formula of the substances
Answer:
B
Explanation:
chemical reaction a process in which one or more substance the recessed ants are converted to one or more different substances the products substances are either chemical elements or compounds a chemical reaction rearranges the consulstituent atoms of reactants to create different substances products
How does plate movement affect earths crust?
facell's surface area-to-volume ratio increased from 3:1 to 4:1, what impact would that have on the transport of materials across the cell membrane? A. It would be unchanged B. transport would increase C. transport would decrease D. none of the above
Answer:
Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion. Some materials diffuse readily through the membrane, but others require specialized proteins, such as channels and transporters, to carry them into or out of the cell.
Explanation:
Hopefully this helps :)
An object has a mass of 100kg and a volume of 10m^3.
What is its density?
SHOW WORK FOR FULL CREDIT
Answer:
Mass = 100g
Volume = 10 cm³
Density = Mass/Volume
= 100/10
= 10 cm-³
5. Molds and bacteria contain hydrolytic enzymes used to breakdown proteins,
lipids, etc.
a) (5 Points) Why does food not spoil as fast when it is refrigerated as it
would at room temperature?
b) (5 Points) Meat begins to feel slimy and it smells when it is spoiled due to
a decomposition reaction with oxygen and carbon dioxide. Why would
meats spoil less rapidly when left unsliced?
Answer:Temperature affects storage time and food deteriorates faster at higher temperatures. Microorganisms grow rapidly at room temperature . Thus to slow microbial growth, enzymatic and oxidative processes, food must be stored at room temperature.
Due to decomposition reactions with oxygen or carbon dioxide in the air, meat begins to feel slimy and smell spoiled. ... Because of its smaller surface area, the unsliced meat would have less collisions and therefore, a slower reaction rate.
Explanation:
What is the mass percentage composition of O in L-carnitine (C7H15NO3), a compound that is taken as a dietary supplement to re- duce muscle fatigue?
Answer in units of %. Your answer must be within ± 3.0%
Answer:
3.5% not sure but thank it is
Is warm water or cold water more dense
How many moles are in 187 grams of NH3?
11 moles
13.4
moles
3,179 moles
2,618 moles
Answer:
3126 moles
Explanation:
put them all together times them and add
Which is a characteristic of atoms?
They come in ten major
They are the smallest units of matter
They can be divided
They cannot combine together
Answer:
the second one ..........
Which element or compound has lost electrons in this oxidation-reduction reaction?
4Li + 2CoO → 2Co + 2Li2O
A.
CoO
B.
Li2O
C.
Li
D.
Co
E.
O
Answer:
C. Li
Explanation:
Does this make sense?
Makes sense to me but I would try and add another sentence in the middle to smooth it out some
Answer:
Yes, but you have a bit of grammar mistakes.
Explanation:
Mount. Vesuvius were an African boundary....