Explanation: C) the air temp. at the top is lower
Prometheus is a character that stole fire from the gods in Greek mythology. Which element is named from Prometheus?
Answer:
Promethium
Pm 61
Discovered by Jacob .A. Marinsky
What type of reaction is the following?
C2H 4(g) + 30 2(g) → 2 CO 2(g) + 2 H 20(g)
Answer:
combustion reaction
Explanation:
Cos Milky Said it. Milky Smart.
When limestone (which is principally CaCO3) is heated, carbon dioxide and quick- lime (Cao) are produced by the reaction CaCO3(s) Cao(s) + CO2(g). If 17.6 g of CO2 was produced from the ther- mal decomposition of 40.92 g of CaCO3, what is the percentage yield of the reaction? Answer in units of %.
Answer:
B.They show that the speaker’s memories come from various senses and seasons.
B.They show that the speaker’s memories come from various senses and seasons.
Explanation:
in the ideal gas law which variable represents the gas constant?
a: T
b: R
c: n
d: V
e: P
Explanation:
It is represented using the ideal gas equation , or PV = nRT, where P is the pressure in atmospheres, V is the volume in liters, n represents the quantity of particles in the container, T represents the temperature in Kelvin, and R is the ideal gas constant equal to 0.0821 liters atmospheres per moles Kelvin.
______ have no definite shape, but definite volume
A. solids
B. liquids
C. gases
D. plasmas
Answer:
liquids
Explaination:
what is the temperature of 0.750 of a gas stored in a 6,850 mL cylinder at 2.21 atm?
Help pleaseeeeeee
Using your knowledge of alpha beta and Gamma decay and your periodic table practice using your ideas by completing the following equations
Answer:
20. ²⁴¹₉₅Am —> ²³⁷₉₃Np + ⁴₂He
21. ⁴²₁₉K —> ⁰₋₁β + ⁴²₂₀Ca
Explanation:
20. ²⁴¹₉₅Am —> __ + ⁴₂He
Let ⁿₘX be the unknown.
Thus, the equation becomes:
²⁴¹₉₅Am —> ⁿₘX + ⁴₂He
Next, we shall determine n, m and X. This can be obtained as follow:
241 = n + 4
Collect like terms
n = 241 – 4
n = 237
95 = m + 2
Collect like terms
m = 95 – 2
m = 93
Thus,
ⁿₘX => ²³⁷₉₃X => ²³⁷₉₃Np
Therefore, the complete equation is:
²⁴¹₉₅Am —> ²³⁷₉₃Np + ⁴₂He
21. __ —> ⁰₋₁β + ⁴²₂₀Ca
Let ʸₓZ be the unknown.
Thus, the equation becomes:
ʸₓZ —> ⁰₋₁β + ⁴²₂₀Ca
Next, we shall determine y, x and Z. This can be obtained as follow:
y = 0 + 42
y = 42
x = –1 + 20
x = 19
Thus,
ʸₓZ => ⁴²₁₉Z => ⁴²₁₉K
Therefore, the complete equation is:
⁴²₁₉K —> ⁰₋₁β + ⁴²₂₀Ca
A .60 L sample of nitrogen is heated from 27℃ to 77℃ at a constant pressure. What is the final volume of the gas?
(show work please)
Answer:
CHARLES' LAW
given:
= 600 mL = 0.6 L
= 27 °C = 300.15 L
= 77 °C = 350.15 L
conversion:
= 600 mL (1 L / 1000 mL)
= 0.6 L
= 27 °C + 273.15 K
= 300.15 K
= 77 °C + 273.15 K
= 350.15 K
solution:
= ( × ) ÷
= (0.6 L × 350.15 K) ÷ 300.15 K
= 0.7 L
4. What is the volume, in liters, of a 3.00 mole sample of carbon dioxide at STP?
Answer:
One mole of ideal gas occupies 22.4L volume at STP
Explanation:
So., we treat carbon dioxide an ideal gas:
3 mol x 22.4L •Mol-¹ ≈? ?L
I NEED HELP PLS ;-; !!!!
Identify the number of electrons each of the following atoms needs to gain or lose to have a stable outer electron configuration.
a. sodium (Na)
b. strontium (Sr)
c. sulfur (S)
d. astatine (As)
Don’t understand need explanation and answer will give brain list
Answer:
B. is the answer.
Explanation:
Hello there!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed, we infer that the correct answer must have the same number of atoms at both sides of the equation.
Therefore, we can see how B. has three white molecules as well as three black molecules at the reactants side and after the chemical reaction there are two molecules having a total of three of each molecule at the products side unlike the other choices; for that reason the correct answer is B.
Best regards!
Nickel carbonyl decomposes to form nickel and carbon monoxide, like this:
Ni(CO)4(g) → Ni(s)+ 4CO(g)
At a certain temperature, a chemist finds that a 2.6 L reaction vessel containing a mixture of nickel carbonyl, nickel, and carbon monoxide at equilibrium has the following composition:
compound amount
Ni(CO)4 0.597g
Ni 12.7g
CO 1.98g
Required:
Calculate the value of the equilibrium constant for this reaction.
Answer:
[tex]K=4.07x10^{-4}[/tex]
Explanation:
Hello!
In this case, according to the given chemical reaction, it is possible to set up the equilibrium expression as shown below:
[tex]K=\frac{[CO]^4}{[Ni(CO)_4]}[/tex]
Since the nickel product is solid and is not included. It means that the concentrations at equilibrium of CO and Ni(CO)₄ are:
[tex][CO]_{EQ}=\frac{1.98g}{28.01g/mol} *\frac{1}{2.6L}=0.0272M[/tex]
[tex][Ni(CO)_4]_{EQ}=\frac{0.597g}{170.73g/mol} *\frac{1}{2.6L}=0.001345M[/tex]
Thus, there equilibrium constant for the reaction turns out to be:
[tex]K=\frac{(0.0272)^4}{[(0.001345)}\\\\K=4.07x10^{-4}[/tex]
Best regards!
It’s worth 50 points please help! It’s due soon!
Answer:
1. NO2
2.49.4%
Explanation:
1. Find the moles of each and divide by the smallest
N: 30/14=2.14/2.14=1
O: 62/16=3.875/2.14=1.81 (round to nearest whole number)
NO2
2. Find the total mass and divide by each
Total: 291.7167
There are 9 oxygens so multiply mass by 9
16*9=144
144/291.7167=0.493629607
2 CO(g) + O2(g) + 2 CO2(g)
What type of reaction is shown above?
Answer:
I'm pretty sure its a combination reaction!!
Explanation:
they generally form between metals and non metals like that^
anyone know the name of this structure please and thank you
Answer:
The graph shown is not a function because points (-1,2) and (-1,0) have the same x value.
Explanation:
What is the empirical formula of C20H40
Answer:
CH2
Explanation:
The empirical formula gives the lowest whole number ratio of the elements. In this case, both subscripts can be divided by 20, hence CH2.
HELP NOW Do Now 3.5 Purple
Do Now 3.5 Purple
POSSIBLE POINTS: 100
Why can I smell a chocolate bar even though it is a solid?
Read the description of the office mystery and write your prediction below.
On a warm afternoon, a Universal Space Agency office worker returned from lunch break and noticed the office smelled like chocolate.
She didn't see anything in the air, but she noticed her coworker was opening the wrapper of a solid bar of chocolate. Why can the
office worker smell the chocolate bar even though it is in solid form?
Sim
• 1. Use the Sim to determine if the molecules of a substance can be in two different phases at the same time.
• 2. Go through each substance and see if you can get it to exist in two phases at once.
Directions
Using evidence from the articles you have read as well as the Sim and other activities you have completed in this lesson, write down
your initial ideas about why this mystery occurred. Be ready to share your ideas.
В І
Answer:
The smell of a chocolate is from the presence of volatile compounds present in the chocolate bar which at room temperature readily changes phase from solid to liquid to vapor or gas
Explanation:
There are nearly 600 identified compounds present in a chocolate bar and out of these, there are volatile components which gives the chocolate bar its distinctive aroma.
These volatile chocolate contents readily change phase from solid to vapor, with very short duration liquid phase.
For example, 3 methylbutanal, vanillin, and several organic compounds which are known to be readily volatile.
A scientist has 8.5 g of silver nitrate and needs to prepare 1.5 L of a 0.020 M solution. Will there be enough silver nitrate? If so, how much silver nitrate will be leftover?
A) Nothing leftover
B) 3.4 g
C) 0.040 g
D) 2.3 g
Answer:
is
Explanation:
the fest president is
How many moles of aluminum are needed to react with 12 moles of hydrochloric
acid
If you were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials, which would you consider more dangerous to you?
aswer: protactinium-234 is more dang erous than uranium
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore protactinium-234 is more dangerous than uranium-234.
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. Protactinium-234 and uranium-234 are radioactive element.
If we were sitting near a gram of protactinium-234 and a gram of uranium-234, both solid materials then protactinium-234 is more dangerous than uranium-234. The half-life of protactinium-234 is smaller than that of uranium-234. So, protactinium-234 is more active than uranium-234 and hence more harmful than uranium-234.
Therefore, protactinium-234 is more dangerous than uranium-234.
To know more about nuclear decay, here:
https://brainly.com/question/21114779
#SPJ2
What is the speed of the green line if the distance it covered is 4 m in a time of one second
40m/s
4m/s
2m/s
Answer: 40m/s
Explanation:
What would happen if two negative charges were next to each other? What if a positive charge and a negative change were next to each other?
Answer:
if two negative charges are next to each other they repel.
But if positive and negative charges are next to each other they attract.
Explanation:
Why because like changes repel and unlike charges attract
what is the pattern of valence numbers on the periodic table?
Answer:
In general, the number of valence electrons is the same within a column and increases from left to right within a row. Group 1 elements have just one valence electron and group 18 elements have eight, except for helium, which has only two electrons total.
A 1.250-g sample of benzoic acid, C7H6O2, was placed in a combustion bomb. The bomb was filled with an excess of oxygen at high pressure, sealed, and immersed in a pail of water which served as a calorimeter. The heat capacity of the entire apparatus (bomb, pail, thermometer, and water) was found to be 10.134 kJ/K. The oxidation of the benzoic acid was triggered by passing an electric spark through the sample. After complete combustion, the thermometer immersed in the water registered a temperature 3.256 K greater than before the combustion. What is DEcombustion per mole of benzoic acid burned
Answer:
3224 kJ/mol
Explanation:
The combustion of benzoic acid occurs as follows:
C₇H₆O₂ + 13/2O₂ → 7CO₂ + 3H₂O + dE
The change in temperature in the reaction is the change due the energy released, that is:
3.256K * (10.134kJ / K) = 33.00kJ are released when 1.250g reacts
To find the heat released per mole we have to find the moles of benzoic acid:
Moles benzoic acid -Molar mass: 122.12g/mol-:
1.250g * (1mol / 122.12g) = 0.0102 moles
The dE combustion per mole of benzoic acid is:
33.00kJ / 0.0102moles =
3224 kJ/mol
what adaptation help protect a cactus against herbivores
Answer:
spines
Cacti have spines, which are also called needles or thorns. Spines are modified leaves or leaves that have changed. Spines do not dry out. Spines deter herbivores from consuming this plant.
Explanation:
hope this helps...
Answer: Tunneling underground to offer protection from predators and extreme temperatures.
Explanation: A behavioral adaptation aimed at attracting a mate. A physical adaptation that allows birds to catch prey. Modified leaves that protect a cactus from herbivores.
How many moles are in 20 grams of Ca (Calcium)? *
Answer: The correct is 0.5 moles.
Explanation:
The rate at which the plates move apart ______
Answer:
one to two inches (three to five centimeters) per year.
Explanation:
Answer:
1 to 2 inches (3 to 5 centimeters) per year
Explanation:
It depends on what plates your talking about, but in general, they move apart anywhere from 1 to 2 inches (3 to 5 centimeters) per year.
Specifically, though, The Arctic Ridge has the slowest rate (less than 2.5 cm/yr), and the East Pacific Rise near Easter Island, in the South Pacific about 3,400 km west of Chile, has the fastest rate (more than 15 cm/yr).
When 2 equal forces act on and object and the object generally doesn't move is
A. interia
B. unbalanced force
C. balanced force
D. speed
Answer:
a balanced force since the object isn't moving
hope this helped
From the chemical reaction Na + Cl2 --> NaCl. How many liters are in NaCl from 2.5 mol of Cl2
Answer: The limiting reactant is
Na
. The theoretical yield is 112 g
NaCl
.
Explanation:
HELP PLS! I NEED TO GET THIS RIGHT! Curious Carl and his lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid. They observed bubbles being produced and did a variety of tests to identify the escaping gas; it proved to be hydrogen The reaction is represented by the following equation:
Mg + 2HCL -> MgCL2 + H2(g)
Assuming STP, how many moles of hydrogen gas did Carl and his partner collect if they collected 5.6L?
Answer:
0.25 mole of H₂
Explanation:
The equation for the reaction is given below:
Mg + 2HCl —> MgCl₂ + H₂
From the question given above, we were told that the reaction produced 5.6 L of H₂.
Thus, we can obtain obtain the number of mole of H₂ that occupied 5.6 L at STP as follow:
1 mole of H₂ occupied 22.4 L at STP.
Therefore, Xmol of H₂ will occupy 5.6 L at STP i.e
Xmol of H₂ = 5.6 / 22.4
Xmol of H₂ = 0.25 mole
Therefore, 0.25 mole of H₂ were obtained from the reaction.