How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
1. In a chemical reaction
a. the mass of the reactants equals the mass of the products.
b. the mass of the products is greater than the mass of reactants.
c.the number of atoms in the reactants and products must change.
d. energy as heat must be added to the reactants.
Answer:
A
Explanation:
Law of conservation of matter
What would the products be for the reaction between Na3PO4 + MgSO4?
MgSO4 + Na3PO4 = Na2SO4 + Mg3(PO4)2
Answer: The products of Na3PO4 + MgSO4 are Na2SO4 + Mg3(PO4)2
Explanation:
1. A volume of 120.0 liters of a gas is prepared at a pressure of 400.0 mm Hg and a temperature
100.0 °C. The gas is placed into a tank under high pressure. When the tank cools to 10.0°C,
the pressure of the gas is 20.0 mm Hg. What is the volume of the gas?
Answer:
[tex]V_2=2487.9L[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the final volume by using the combined ideal gas:
[tex]\frac{P_2V_2}{T_2}=\frac{P_1V_1}{T_1}[/tex]
In such a way, by solving for the final volume, V2, we obtain:
[tex]V_2=\frac{P_1V_1T_2}{P_2T_1} \\\\[/tex]
Now, by plugging in the pressures, temperatures in Kelvins and initial volume, we will obtain:
[tex]V_2=\frac{(400.0mmHg)(120.0L)(283.15K)}{(20.0mmHg)(273.15K)}\\\\V_2=2487.9L[/tex]
Regards!
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melodymuzeya017
3 days ago
Chemistry
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1. You are given 50 g of hot coffee (at 80 °C) but given that it is a hot day, you now
want a cold coffee. What is the minimum amount of ice (in grams) that you must add
to cool the coffee to a temperature of 10 °C? Assume that coffee has the same specific
heat as water and neglect the heat content of the cup and heat exchanges with the
surroundings. The ice temperature is 0 °C. Given: water(3) — 37.6 J/(mol °C), Cwatert 1) =
75.4 J/mol °C), AH tus – 6.01 kJ/mol.
If the
ice comes
from a freezer at - 20 °C, would you expect to have to add more or
less ice to cool the coffee? Support your answer by doing the calculation.
when Mn2 ions are separated from the mixture, they go through a series of oxidizing and reducing steps. Write the reaction equations that describe this process
Answer: hello some part of your question is missing below is the missing part
when H₂O and H₂O₂ is added to Mn(OH)₂(s) and put in water bath to dissolve
answer : attached below
Explanation:
When Mn²⁺ ions are separated from the mixture, attached below are the requires reaction equations that shows the process of separation.
Mn²⁺ ions are separated to the right of the reaction equations
when rolling a number cube 500 times, how many times you expect to get a 3?
Answer:
[tex]\frac{250}{3}[/tex]
Explanation:
you can expect to get a 3 (theoretically) 1 time every 6 times you roll. A 1/6 chance.
Here's the equation:
[tex]\frac{1}{6} =\frac{x}{500}[/tex]
cross multiply (i think that's what it is called)
500=6x
divide by 6 on both sides:
x=[tex]\frac{250}{3}[/tex] or approx 83 times.
Hope this helps! Lmk if u have more questions <3
True or False. And please show your work!
false I think? I could be wrong
HOW MANY ELEMENTS ARE IN 3FE(OH)3
Answer:
Three
Explanation:
Iron
Oxygen
Hydrogen
What new evidence led scientists to change their minds about the geocentric model?
Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.
The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.
What is Geocentric Model?Geocentric model is any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.
This model is often named Ptolemaic model after its most famous supporter, the Greco-Roman astronomer Ptolemy.
The geocentric is often referred to as the Medieval view of the universe and it dominated thinking into the early modern age.
Therefore, The new evidence led scientists to change their minds about the geocentric model is that the Sun and stars move across the sky in the same direction everyday. They appear to be going around the Earth. However, Galileo observed moons which orbited Jupiter. This suggests that not everything orbits the Earth and that the geocentric model is not correct.
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Explain what matter is, and all of the states it can have.
Answer:
matter is anything that occupies space
states of matter : solid,liquid, gas,plasma
Answer:
matter can be anything, tables chairs, literally anything. it has volume and takes up space.
Explanation:
Solids, liquids, gases, plasmas, and Bose-Einstein condensates (BEC)
Help plz:)))I’ll mark u Brainliest
Answer:
[tex]\Delta _{fus}H=205J/g=13.03kJ/mol[/tex]
Explanation:
Hello there!
In this case, since the heat of fusion is a property that allows us to calculate the heat involved during the change from solid to liquid (fusion) and is calculated as shown below:
[tex]Q=m*\Delta _{fus}H[/tex]
In such a way, given the heat involved during this process and the mass of copper, we calculate the heat of fusion as shown below:
[tex]\Delta _{fus}H=\frac{Q}{m}=\frac{41000J}{200.g}\\\\\Delta _{fus}H=205J/g[/tex]
Or in kJ/mol:
[tex]\Delta _{fus}H=205\frac{J}{gCu}*\frac{63.546 gCu}{1molCu}\\\\ \Delta _{fus}H=13026.93J/mol=13.03kJ/mol[/tex]
Regards!
Which element is a noble gas?
A. H
B. Ko
C. Xx
D. Ar
E. O
Answer:
bnklknnjjkjjnnbbbbbbn
Answer:
A. H
H
Explanation:
Hope it helps :)
cggvgg
Cu+k.HNO3 --> Cu(No3)2+..........+...........
Answer:
Cu + HNO3 → Cu(NO3)2 + H2O + NO2
Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 (balanced equation)
How many grams are in 0.5 moles of CO2?
Answer:
0.5 mole CO2=0. 5×44=22 gm.
In an endothermic reaction, the energy of
the surroundings is
than the energy of
the system
Answer:
THE CORRECT ONE IS THE SECOND ONE WITH THE SIGN IS " = "
Explanation:
THE GIVEN EXPLANATION : Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products. These reactions lower the temperature of their surrounding area, thereby creating a cooling effect. ... When a chemical bond is broken, it is usually accompanied by a release of energy.
Study the reaction.
CH4 + 2O2 → CO2 + 2H2O
If 7.4 moles of carbon dioxide (CO2) form at the end of the reaction, how many moles of methane (CH4) and oxygen gas (O2) entered the reaction?
? moles of methane and
? moles of oxygen gas
7.4 moles of methane (CH₄)
14.8 moles of oxygen gas (O₂)
When might a doctor prescribe
steroids?
Pls give theeee answerrrrrrrr
Which example of weathering includes a chemical change
Answer:
Carbonation
Explanation:
An example of weathering which includes a chemical change is that of carbonation.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical change,here:
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Oxygen and ozone are allowed to come to equilibrium in the exothermic reaction 2O3(g) <--> 3O2(g) Which change will increase the numerical value of the equilibrium constant, K
Answer:
don't get the question2
Can someone please help me out, I need to do this asap. Tired of bots responding my questions and would have to report it instantly
Answer:
Solution given:
Required reaction is:
2H2+O2➔2H2O
now
10.
oxygen have 16 amu than total mass in the left side of oxygen is:
16×2=32 amu of Oxygen
11.
total mass of Oxygen in product side is;
16×2=32 amu of Oxygen
In the chemical equation 2Mg(s) + O2(g) ? 2MgO(s),
a Mg represents the product magnesium.
b. the reaction yields magnesium.
c. Mg represents the reagent magnesium.
d. O, represents the product oxygen gas.
In the reaction; 2Mg(s) + O2(g) ------> 2MgO(s), Mg represents the reagent magnesium.
What is a chemical reaction?The term chemical reaction has to do with the interaction between compounds which are called reactants to yield a new compound which is called the product.
In the reaction; 2Mg(s) + O2(g) ------> 2MgO(s), Mg represents the reagent magnesium.
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Magnesium hydroxide and sodium hydroxide are both strong bases. The pH of a saturated solution of sodium hydroxide is greater than 14. The pH of a saturated
solution of magnesium hydroxide is about 10.2. Why do the solutions have different pH values?
Answer: Solubility of NaOH is greater and there are more OH- ions in solution.
Explanation: Reactions : NaOH (s) ⇒ Na+ (aq) + OH- (aq)
Mg(OH)2 (s) ⇒ Mg2+ (aq) + 2 OH-(aq)
Although in same amount of moles, Mg(OH)2 produces
two (OH-)-ions in water solution, solubility of Mq(OH)2 is smaller.
Concentration [OH-]ions is smaller in saturated water solution
of Mg(OH)2
Rate 2021 so far
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5/5
Answer:
Is this an actual question that you had for school?
Explanation:
Answer:
3/5. Its still really stressful but at least it's better than 2020.
Given: glow is a find the indicated measure.
Answer:
is there supposed to be some type of image or ...
Explanation:
Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water. nickel(II) cyanide silver hydroxide
Answer:
[tex]Ksp=[Ni^{2+}][CN^-]^2\\\\Ksp=[Ag^+][OH^-][/tex]
Explanation:
Hello there!.
In this case, for this equilibrium problem, it turns out firstly necessary to write the chemical equations for the solubilization of both nickel (II) cyanide and silver hydroxide as shown below:
[tex]Ni(CN)_2(s)\rightarrow Ni^{2+}(aq)+2CN^-\\\\AgOH(s)\rightarrow Ag^+(aq)+OH^-[/tex]
Thus, by means of the law of mass action we set up these equilibrium expressions as shown below:
[tex]Ksp=[Ni^{2+}][CN^-]^2\\\\Ksp=[Ag^+][OH^-][/tex]
Best regards!
What do you think happens to the atoms of a substance when it burns?
Claim 1: All of the atoms are destroyed.
Claim 1: All of the atoms are destroyed.
Claim 2: All of the atoms rearrange to form a different substance or different substances.
Claim 2: All of the atoms rearrange to form a different substance or different substances.
Claim 3: Some of the atoms are destroyed, and some of the atoms rearrange to form a different substance or different substances.
Explain why you chose your answer.
Answer:Its claim 2
Explanation:claim 1 says All of the atoms are destroyed but atoms cant be destroyed.Claim 3 might seem correct but is not.
A student weighs out a 6.04 g sample of , transfers it to a 100. mL volumetric flask, adds enough water to dissolve it and then adds water to the 100. mL tick mark. What is the molarity of chromium(III) sulfate in the resulting solution
Answer:
"0.1540 M" is the correct answer.
Explanation:
The given values are:
Mass of sample,
M = 6.04 g
Volume,
V = 100 mL
or,
= 100×10⁻³ L
Molar weight of Chromium(III) sulfate
MW = 392.16 g/mol
Now,
The molarity will be:
= [tex]\frac{M}{MW\times V}[/tex]
By putting the values, we get
= [tex]\frac{6.04}{392.16\times 100\times 10^{-3}}[/tex]
= [tex]\frac{6.04}{39.216}[/tex]
= [tex]0.1540 \ M[/tex]
Over a period of 30 days a student studied the night sky and recorded his observations. One night he watched a shooting star streak across the sky. His curiosity led him to list all the possible things it could be, then after researching, analyzing and comparing each, he proposed that which of the following was the most logical identification of a "shooting star? Answer F asteroid G comet H meteor J moon
Answer:
meteor
Explanation:
The most logical identification of a "shooting star" is a meteor. A meteor is basically any material from outerspace that falls to Earth. The main characteristic of a meteor is that from our point of view on the surface of the Earth it looks like a shooting star because we see a streak of light behind it. This light is simply dust and rock from the meteor burning up as it enters the Earth's atmosphere, leaving a "tail" of light behind it. Which to us looks like a shooting star.
