Answer:
a
Explanation:
It's a duh
Calculate the total energy, in kilojoules, that is needed to turn a 46 g block
of ice at -25 degrees C into water vapor at 100 degrees C.
Answer: The total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.
Explanation:
Given: Mass = 46 g
Initial temperature = [tex]-25^{o}C[/tex]
Final temperature = [tex]100^{o}C[/tex]
Specific heat capacity of ice = 2.05 [tex]J/g^{o}C[/tex]
Formula used to calculate the energy is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass
C = specific heat capacity
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\= 46 g \times 2.05 J/g^{o}C \times (100 - (-25))^{o}C\\= 11787.5 J (1 J = 0.001 kJ)\\= 11.787 kJ[/tex]
Thus, we can conclude that the total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.
A dunk of water holds 550,200 grams of water. How many moles of water are in the tank?
Answer:
12
Explanation:
there are 12 because of the desnity
Nitrogen and sulfur oxide gases originate from all of the following, EXCEPT
A . lightening Strikes
B. Volcano eruptions
C. Car exhaust
D . Plant Respiration ANSWER IT FOR 50 PIONTS!!!!!!!!!!!!!
Answer:
the answer is D (つ°ヮ°)つ （＾ω＾）
Given the balanced equation representing a reaction:
HCl + H2O H3O+ + Cl-
The water molecule acts as a base because it
Answer:
It accepted a proton from HCl
Explanation:
When properly written, the equation box the reaction is given as; HCl(aq) + H2O(l) ----> H3O+(aq) + Cl-(aq).
According to Brownstead-Lowry definition of acids and bases, an acid donates protons while a base accepts protons.
Water molecule acts as a base in the reaction because it accepted a proton from HCl in the reaction above.
A gas occupies 25.3 at pressure of 790.5 mmHg. Determine the volume if the pressure is reduced to 8.04 mmHg
Answer:
2487.51.
Explanation:
As per Boyle's law temperature remaining constant the volume of an ideal gas is inversely proportional to its pressure.
pV= k
therefore, p1V1 = p2V2
here V1 = 25.3, p2 = 8.04mm Hg
pressure p1 = 790.5 mm Hg
this means that
25.3×790.5 = 8.04V2
⇒V2= 2487.51
Hence, the required volume is, 2487.51.
an archaeologist discovers an ancient wooden bowl. which isotope would most likely be used to determine its age?
a. carbon-12
b. carbon-14
c. uranium-238
d. oxygen-16
please and thank you to anyone who may know the answer.
Answer:
B
Explanation:
At which of the four labeled points on the titration curve below do you expect to find the highest concentration of hydroxide
ions?
A
B
C
D
Answer:
D.
Explanation:
Hydroxide ions are produced when acid reacts with a base under a Ph value of more than 7. Hydroxide ions are negatively charged ions which are released in the aqueous solution during titration process. It a oxygen and hydrogen atom covalent bond.
I need some help
3KOH + FeCl3 → Fe(OH)3 + 3KCl
How many moles of FeCl3 are needed to completely react with 3.0 g of KOH?
Answer:
0.0178
Explanation:
because you can work out the amount of moles in KOH using moles = mass/mr.
The mr of the KOH is 39.1+16+1=56.1 so you do
[tex] \frac{3}{56.1} [/tex]
which equals to 0.053475 so u 3SF which is 0.0535moles
than u uses the molar ratio which is 3 to 1
so 0.0535÷3=0.0178 which is the moles of FeCl3.
hope this make sense:)
Match the following quantities
-
6.02 x 1023 atoms of Al
-
1 molecule of N2O
-
6.02 x 1023 molecules of C2H4
-
1 atom of Au
A.
28.05 g
B.
26.98 g
C.
44.01 u
D.
196.97 u
Answer:
C.44.01 u
Explanation:
basta ayan yong answer ko
Suppose you are titrating an acid solution with a base solution of known concentration. To calculate the concentration of the acid solution, use three steps. 1. Use the -------------- { (a) delivered volume (b) volume reading} of base --------------- { (a) after (b) to reach (c) before} the endpoint and the known concentration of the base solution to find the ------------ { (a) moles (b) mass (c) concentration} of base used. 2. Use the ------------ { (a) molar mass (b) dilution equation (c) molar ratio} to find the moles of acid from the moles of base. 3. Divide the moles of acid by the volume of -------------- { (a) base solution before (b) acid solution before (c) acid solution after} the titration to find the concentration of acid.
Answer:
1. (a) delivered volume, (b) to reach, (a) moles
2. (c) molar ratio
3. (b) acid solution before.
Explanation:
1. You must titrate the acid with a base solution of known concentration, and use the (a) delivered volume. At the endpoint, the moles of acid and base in the titration follows the chemical equation, thus, you need (b) to reach the endpoint. With volume and concentration of the base we can find its (a) moles
2. With the (c) molar ratio, we can relate the moles of base with the moles of acid
3. When we have the moles of acid, we just need the volume of (b) acid solution before the titration to find molarity of the acid.
what's the common name for hydrogen oxide
_ As + _ NaOH → _Na3AsO3 + _H2
How many moles of aluminum are in this aluminum can? Answer: ____________ (25 pts) Calculate the number of aluminum atoms in this can. Answer: _______________ (25 pts) The Amount of Aluminum is 12.69g
Answer:a)No of moles of Aluminium=0.4703
b)number of aluminum atoms=2.832 x 10^23 atoms
Explanation:
a)Given that The Amount/ Mass of Aluminum is 12.69g
We know that
No of moles =Mass/ Molar mass
Molar mass of Aluminium, Al is 26.982 g/mol
No of moles =12.69g/26.982 g/mol
No of moles =0.4703
Also
b) 1 mole of aluminium must contain 6.022 x 10^23 atoms of aluminium
which is known as Avogadro's constant.
Therefore, 0.4703 moles will contain 0.4703 x 6.022 x 10^23 atoms =2.832 x 10^23 atoms
Why can’t neon store energy in this way?
Answer:
Neon is a noble gas, it is monoatomic in nature, which implies that it has only one atom present. If we compare neon with water, water has three atoms present, two hydrogen atoms and one oxygen atom. Hence water stores more energy than neon because it is polyatomic and contains chemical bonds.
How many joules would be required to change the temperature of 250.0 g of aluminum from 15.0°C to 75.0°C? The specific heat capacity of a luminum is 24.2J/g°C.
A gas at constant volume has a pressure of 2.80 atm at 400. K. What will be the pressure of the gas at 360. K? (4 points)
2.52 atm
2.94 atm
3.11 atm
3.78 atm
Option first 2.52 atm
Answer:
Solution given:
pressure 1[P1]=2.8atm
pressure 2[P2]=?
temperature [T1]=400k
temperature [T2]=360k
now
By using gas equation
P1V1/T1=P2V2/T2
since
volume is constant
P1/T1=P2/T2
2.8/400=P2/360
P2=2.8*360/400
P2= 2.52
Answer:
It's 2.52
Explanation:
This requires Gay-Lussac's Law, in which the relationship is P1 / T1 = P2 / T2. "P" stands for Pressure and "T" is Temperature. The first pressure is 2.80, the first temperature is 400 Kelvin, the second pressure is unknown (that's what your solving for), and your second temperature is 360 Kelvin. Because you don't have the second pressure, your equation will look like 2.80 atm x 360 K / 400. This will tell you that the pressure of the gas at 360 K will be 2.52.
I also took the test and it was correct.
How many grams of FeCl3 are needed to make 1.5 L of a solution with a molarity of 0.450 M?
Analyze the following chemical combinations
a) MgO
b)CaCl2
c) Na2O
the correct sequence where reactivity towards oxygen increases.
Answer:
Option D is good to go!
Explanation: as per the reactivity series more reactive substances will react with the counterpart substance.The most reactive substance here is calcium while the least reactive is aluminium, the magnesium comes in between.As per their reactivity, these substances will react with oxygen.
Explanation:
Using the following balanced equation, if you had 48 molecules of O2,
how many molecules of SO3 would you produce?
S8 + 12O2 --> 8SO3
Explanation:
hope this helps u understand:)
La formula quimica de la molecula de agua H20 , si H = 1 gramos y O = 16 gramos . Cual es su composicion porcentual ? 88,88 % de O y 11,11 % de H 88,88 % de H Y 11,11% de O 80 % de O Y 20 % de H 90% de O Y 10 % de H
Answer:
88,88 % de O y 11,11 % de H
Explanation:
La composición porcentual se define como la masa que hay de cada mol de átomo en 100g. Las moles de agua en 100g son:
Masa molar agua:
2H = 2*1g/mol = 2g/mol
1O = 1*16g/mol = 16g/mol
Masa molar = 2 + 16 = 18g/mol
100g H2O * (1mol / 18g) = 5.556 moles H2O.
Moles de hidrógeno:
5.556 moles H2O * (2mol H / 1mol H2O) = 11.11 moles H
Moles Oxígeno = Moles H2O = 5.556 moles
La masa de hidrógeno es:
11.11mol * (1g/mol) 11.11g H
La masa de oxígeno es:
5.556 mol * (16g / 1mol) = 88.89g O
Así, el porcentaje de O es 88.89% y el de H es 11.11%. La opción correcta es:
88,88 % de O y 11,11 % de Hthe ending of a compounds name that is made up of three elements,one of which is oxygen
Answer:
—COOH
Explanation:
—COOH, acid group, containing 3 elements, C, carbon, O, oxygen, and H, hydrogen.
Let's start by figuring out the amount in miles. From there, we can easily find the equivalent mass. Which equation do we need to find out how many moles of NH4Cl would there be in 500 mL of a 0.300 M solution of it?
A. n=C x V
B. C=V x n
C. C=n x V
D. n=C / V
Answer:
A. n= C x V
Explanation:
Molarity of a solution is the molar concentration of that solution. It can be calculated using the formula:
M = n/V
Where;
M = molarity (M)
n = number of moles (n)
V = volume (mL)
To calculate the number of moles from a given molarity value and volume, we say:
n = M × V
For this case of NH4Cl;
V = 500mL = 500/1000 = 0.5L
M = 0.300 M
n = 0.300 × 0.5
n = 0.15moles
Answer: n=CxV
Explanation:
A pan containing 20.0 grams of water was allowed to cool from a temperature of 95.0 °C. If the amount of heat released is 1,200 joules, what is the approximate final temperature of the water?
Answer:
80.7 °C
Explanation:
Step 1: Given and required data
Mass of water (m): 20.0 gInitial temperature (T₁): 95.0 °CHeat released (Q): -1,200 J (the negative sign is due to it being released)Specific heat capacity of water (c): 4.184 J/g.°CStep 2: Calculate the final temperature of the water
We will use the following expression.
Q = c × m × (T₂ - T₁)
T₂ = Q / c × m + T₁
T₂ = -1,200 J / (4.184 J/g.°C) × 20.0 g + 95.0 °C = 80.7 °C
Answer:
81 C
Explanation:
Which statement accurately describes how electrical power and voltage are
related?
A. Power decreases as voltage increases.
B. Power is always half the amount of voltage.
C. Power is always twice the amount of voltage.
D. Power increases as voltage increases.
Answer: B
Explanation:
According to Ohm's Law, the answer is B.
Ohm's Law states that power is equal to volume x current.
If volume x current equals power, that means they are both 50% of power.
Ohm's Law:
power = voltage x current
current = voltage x power
voltage = power x current
I hope this answer helped.
Power is always half the amount of voltage. Hence, option B is correct.
What is voltage?Voltage is the potential difference between two points in a circuit or the electromotive force in a given circuit and is expressed in volts (V).
Voltage is measured by a device called a voltmeter that is always connected in parallel with the current source.
When voltage is measured between two points on a wire in a circuit with zero or no resistance in between the two points then the voltage will be zero.
From the ohm's Law, voltage is given the product of resistance and current and thus if the resistance is zero then the voltage will be zero.
Ohm's Law states that power is equal to volume x current.
If volume x current equals power, that means they are both 50% of power.
Ohm's Law:
power = voltage x current
current = voltage x power
voltage = power x current
Learn more about voltage here:
https://brainly.com/question/2364325
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which method would be best for separating the compounds of a mixture that is made from two diffrent liquids
Answer:
fractional distillation since ot depends on the different liquids to have different boiling points
Name any three organic fertilizer using by farmers ?
Answer:
Typical organic fertilizers include mineral sources, all animal waste including meat processing, manure, slurry, and guano, plant based fertilizers, such as compost, and biosolids.
Which term refers to energy stored within the center of an atom?
A. Thermal energy
B. Nuclear energy
C. Chemical energy
D. Light energy
Answer: i'm pretty sure it's b if i remember correctly.
Explanation:
i learned this a while ago so i'm not completely sure.
What type of structure are ionic lattices?
Big structures
Small structures
Tiny structures
Giant structures
Answer:
Giant structures
Explanation:
An ionic compound is a giant structure of ions. The ions have a regular, repeating arrangement called an ionic lattice . The lattice is formed because the ions attract each other and form a regular pattern with oppositely charged ions next to each other.
Please solve this question for me.
Answer:
0.0013 moles
Explanation:
moles = volume/ molar volume of gas
=240/24000cm3 (convert dm3 to cm3)
=0.0013
