Answer: A: When the rider is at the top of the hill, her potential energy is greatest, and her kinetic energy is the least.
Explanation:
Name the following alkane molecule (picture)
A.) 2-methyl-3-broom-5-ethyloctane
B.) 3-bromo-5-ethyl-2-methyloctane
C.) 3-bromo-5-ethyl-2,7-dimethylheptane
Answer: B. 3-bromo-5-ethyl-2-methyloctane
Explanation:
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
What is IUPAC nomenclature?The IUPAC nomeclature shows the standard,, approved pattern for naming organic compounds. As a matter of fact it is intended to enable pratitioners to write the name of a compound from structure.
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
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Unsaturated, saturated, or supersaturated?
Answer:
supersaturated
Explanation:
The equilibrium constant kc of the reaction H2+I2 produces HI is 54.3at430°C. Starting with 6.0moles,of HI moles of HI in 1.0dm^3 reaction vessel, calculate th5 concentration of H2,I2 and HI at equilibrium
Answer:
[H2] = [I2] = 0.64M; [HI] = 4.72M
Explanation:
Based on the reaction:
H2 + I2 ⇄ 2HI
The K is defined as:
k = 54.3 = [HI]² / [H2] [I2]
Where [] is molar concentration of each reactant at equilibrium
As the initial concentration of HI is 6mol/dm^3 = 6M the equilibrium concentration of each reactant is:
[H2] = X
[I2] = X
[HI] = 6 - 2X
Where X is reaction coordinate
Replacing:
54.3 = [6-2X]² / [X] [X]
54.3X² = 4X² - 24X + 36
0 = -50.3X² - 24X + 36
Solving for X:
X = -1.12. False solution, produce negative concentrations
X = 0.64M. Right solution
Replacing:
[H2] = 0.64M
[I2] = 0.64M
[HI] = 6 - 2*0.64M = 4.72M
Equilibrium concentrations are:
[H2] = [I2] = 0.64M; [HI] = 4.72MWhich type of molecule is shown below?
• A. Alkyne
• B. Aromatic
• C. Alkene
O D. Alkane
If you know that a star is large and red, what else is probably true about it?
O It is a white dwarf.
O It is warmer and brighter than the Sun
O It is cooler and dimmer than the Sun.
O It is cooler and brighter than the Sun.
Answer:
it is cooler and dimmer remember this red stars are old stars near their death
__Co + __F2 --> __CoF3
Answer:
2Co + 3F2 --> 2CoF3
Explanation:
When balancing an equation we need to ensure that the products used equal the reactants produced. Hence to balance the equation we need 3 F2 molecules so we have 6F atoms in total. and since 1 Co molecule bonds to 3 F molecules. We are gonna need to 2 Co molecules.
To balance an equation, you need to write numbers called (BLANK) in front of the molecule or compound. DO NOT CHANGE THE SUBSCRIPTS!
Answer:
Coefficients
Which of these is an example of a monotreme, a mammal that lays eggs?
1. wombat
2. platypus
3. opossum
4. whale
Answer: it is the 4th option in there
Explanation:
Answer:
It platypus
Explanation:
The Platypus lays eggs
in the reaction to prepare chlorine gas,4.35g of manganese dioxide (MnO2) reacted with concentrated hydrochloric acid (HCI) according to the following equation:
MnO2 + 4HCI = MnCL2 + 2H2O + Cl2
i) how many moles of manganese dioxide were there in the 4.35 g sample?
ii) how many moles of hydrochloric acid were required to reacy with 4.35g of manganese dioxide.
iii) Calculate the maximum number of water molecules that could be produced.
iv) how many atoms of hydrigen did this number of water molecules contain?
Answer:
mncL2 is the water molecule
Zn + 2HCI → ZnCl2 + Hz
3. How many moles of hydrogen, H2, will be produced if 0.95 moles of zinc, Zn, reacts
with 6.2 moles of HCI? (Hint: Must determine limiting reactant.)
Answer:
0.95 moles
Explanation:
I believe that this is the equation we are looking at since this is an acid- metal reaction, thus the products would be a salt and hydrogen gas (H₂):
Zn +2HCl → ZnCl₂ +H₂
The limiting reactant is the reactant that we do not have enough of for the reaction to continue. From the balanced equation, the mole ratio of Zn to HCl is 1: 2. This means that for every 1 mole of Zn, 2 moles of HCl is needed.
Let's calculate the number of moles of HCl needed to react with 0.95 moles of Zn.
Number of moles of HCl required
= 0.95 ×2
= 1.9 moles
Since we have 6.2 moles of HCl, HCl is in excess and thus Zn is the limiting reactant. For 6.2 moles of HCl, 3.1 moles of Zn would be needed but we only have 0.95 moles.
For every 1 mole of Zn, 1 mole of H₂ is produced.
Thus, since 0.95 moles of Zn has reacted,
number of moles of H₂ produced= 0.95 moles
Calculate the specific heat of an unknown metal if it took 58.1 J to increase the temperature of 89.4 g of the metal from 23.4°C to 25.5°C.
Answer:
[tex]c=0.309\ J/g^{\circ} C[/tex]
Explanation:
The increase in heat, Q = 58.1 J
Mass, m = 89.4 g
The temperature increases from 23.4°C to 25.5°C. We need to find the specific heat of an unknown metal.
We know that the increase in heat is given by :
[tex]Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{58.1}{89.4\times (25.5-23.4)}\\\\c=0.309\ J/g^{\circ} C[/tex]
So, the specific heat of an unknown metal is equal to [tex]0.309\ J/g^{\circ} C[/tex].
how many grams will be needed
At the same temperature and pressure, 15L of CO2 gas has the same amount of molecules as what volume of N2 gas?
Answer: 15 L of [tex]N_2[/tex] gas will have same numer of molecules as 15L of [tex]CO_2[/tex] gas at the same temperature and pressure,
Explanation:
According to avogadro's law, equal moles of gases occupy equal volume at same conditions of temperature and pressure.
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text{Molar volume}}[/tex]
[tex]\text{Number of moles of} CO_2=\frac{15L}{22.4L/mol}=0.67mol[/tex]
[tex]1 mole of CO_2[/tex] contains=[tex]6.022\times 10^{23}[/tex] molecules of [tex]CO_2[/tex]
Thus 0.67 moles of [tex]CO_2[/tex] contains=[tex]\frac{6.022\times 10^{23}}{1}\times 0.67=4.03\times 10^{23}[/tex] molecules
Now molecules of [tex]N_2[/tex] = molecules of [tex]CO_2[/tex] = [tex]4.03\times 10^{23}[/tex]
[tex]6.023\times 10^{23}[/tex] molecules of [tex]N_2[/tex] = 22.4 L
Now [tex]4.03\times 10^{23}[/tex] molecules of [tex]N_2[/tex] = [tex]\frac{22.4}{6.023\times 10^{23}}\times 4.03\times 10^{23}=15L[/tex]
A 25.0 ml sample of gas has a pressure of 760 torr. What is the volume of the gas if the pressure decreases to 380 torr ? Assume constant temperature.
Please help thanks.
Answer:
50mL
Explanation:
Using Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressure (torr.)
P2 = final pressure (torr.)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information provided in the question,
V1 = 25.0mL
V2 = ?
P1 = 760 torr.
P2 = 380 torr.
Using P1V1 = P2V2
V2 = P1V1//P2
V2 = (760 × 25) ÷ 380
V2 = 19000 ÷ 380
V2 = 50mL
Calculate the pH of a 0.09 M solution of HBr
calculate the PH of a solution 0.030 M HCl
Answer:
pH = 1.522
Explanation:
HCl + H20 -> Cl^(-) + H30^(+)
0.03M ____ ____
____ 0.03M 0.03M
[H30^(+)] = 0.03M
pH = - log([H30^(+)])
pH = - log( 0.03)
pH = 2 - log3
pH = 2- 0.47
pH = 1.522
The pH of the hydrogen chloride, HCl solution having a concentration of 0.03 M is 1.52
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
How to determine the concentration of H⁺Dissociation equation
HCl(aq) —> H⁺(aq) + Cl¯(aq)
From the balanced equation above,
1 mole of HCl contains 1 mole of H⁺.
Therefore,
0.03 M HCl will also contain 0.03 M H⁺
How to determine the pH Hydrogen ion concentration [H⁺] = 0.03 MpH =?pH = –Log H⁺
pH = –Log 0.03
pH = 1.52
Learn more about pH:
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some one please help me
Answer:
C.4
Explanation:
Can somebody plz help answer these true or false questions correctly (only the ones you know that are right)
Thanks :3
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST..promise! :DDDD
Explanation:
1.False
2.False
3.True
4.True
5.False
Heat _____________.
A. Is the Internal energy of matter
B. Is the same as temperature
C. Is a measure of energy
D. Cannot move through a vacuum
Answer:
A. Is the Internal energy of matter
Hope this helps!
What is the biggest grass in the world
Answer:
bamboo is the biggest/tallest grass in the world
Answer:
Giant Bamboo
Explanation:
Giant bamboo, which can grow up to 151 feet tall, is the largest variety of grass.
How a non-polar molecule can ve madre of polar bonds?
Answer:
Explanation:
i cant understand the complete question, can you reword it and ill answer
If I fill a balloon with 5.2 moles of gas and it creates a balloon with a volume of 32.5 liters, how many moles are in a balloon at the same temperature and pressure that has a volume of 15.9 liters?
Answer:
5.2 multiple by 32.5
Ur answer divide by 15.9
169 divided by 15.9
ANSWER is 10.6
2KCIO.
2KOI
30,
2
How many moles of potassium Chlorate are needed to produce 15.0 moles of oxygen
Answer:
10 moles of potassium Chlorate are required to produce 15 mole of oxygen
Explanation:
The balanced chemical equation is
2KClO3(s)→2KCl(s)+3O2(g)
2 moles of potassium Chlorate produce 3 moles of oxygen
Number of moles of potassium Chlorate required to produce 1 mole of oxygen [tex]= \frac{2}{3}[/tex]
Number of moles of potassium Chlorate required to produce 15 mole of oxygen
[tex]= \frac{2}{3} * 15\\= 10[/tex]
10 moles of potassium Chlorate are required to produce 15 mole of oxygen
Write word equation of carbon burns in oxygen
Answer:
Word equation carbon + oxygen → carbon dioxide
Chemical equation C + O2 → CO2
9. Which of these things is true about the Moon?
A
The Moon is always moving around Earth in a circle.
B
The Moon is always in the same position in Earth's sky.
С
The Moon is always moving in many changing patterns around Earth.
D
The Moon is always moving back and forth across Earth's sky.
The true statement about the Moon is: A. The Moon is always moving around Earth in a circle.
What is a Moon?A Moon can be defined as the natural satellite of planet Earth that shines due to the Sun's reflected light, as it revolves around the Earth from west to east in 29½ days.
The phases of the Moon.Generally, there are four (4) primary Moon phases and these are:
New MoonFirst QuarterFull MoonThird Quarter (Last Quarter)In conclusion, the true statement about the Moon is that it is always moving around Earth in a circle.
Read more on the Earth here: brainly.com/question/1286910
how many moles of aluminum are produced from 4.9 moles of lithium?
Answer:
2.95078 × 10^23
hope this helps you ☺️☺️
what the difference between a sodium atom (Na) and a sodium ion (Nal+)
Answer:
So a sodium atom has the electronic configuration 2,8,1 meaning it has 1 electron on its outer shell. It has a neutral charge since the number of electrons is equal to the number of protons.
A sodium ion is one that has lost the electron on its valence shell. The electronic configuration is 2,8 and it has a positive charge because it has more protons than electrons.
Answer:
[tex]\boxed {\boxed {\sf Number \ of \ electrons \ and \ net \ charge}}[/tex]
Explanation:
Remember that protons have a positive charge of +1 and electrons have a negative charge of -1. Atoms have protons and electrons.
A sodium atom has the electron configuration of 2-8-1. It has 11 electrons and its atomic number (number of protons) is also 11. This means it is a neutral atom because the charges of the electrons (-11) and protons (+11) balance each other out.
However, a sodium ion is different. It loses the 1 valence electron, so it only has 10 electrons. It still has the same atomic number of 11.
It is a not a neutral atom because the charges of the electrons (-10) and protons (+11) do not balance out. It has more protons and a net positive charge of +1. It is a cation or a positively charged ion.
Need this less than 4 minutes!! In which step do we see the chromosomes condense and meet up to form homologous pair?
Metaphase II Metaphase I Anaphase II Prophase I Prophase II
Answer:
Prophase I
Sorry if wrong I was rushing !!
If the reaction was reversed and we wanted to produce as much NaN3, in grams, as possible from 30.0 g of N2 and 20.0 g of Na, which reactant would be the limiting reactant? (4 points) How much NaN3 would actually be produced?
Answer:
N₂
Explanation:
Sodium is a larger molecule with a much higher molecular weight. However, 20g of N₂ would be a smaller amount of molecules than 20g of sodium due to how there are multiple nitrogen molecules.
2/3 * given mass of N₂ = mass of N₃
N₃ (Azide ion) given mass = 20g
Na = 20g
Masses of chemicals are equal
Na = 22.990g/mol
20g/22.990g/mol = 0.8699mol of Na
N₃ = 20g
N₃ = N g/mol x 3
N = 14.007 g/mol
14.007 x 3 = 42.021 g/mol
N₃ = 42.021g/mol
20g/42.021g/mol = 0.4759 mol of N₃
Notice how there are fewer moles of the Azide ion than the Sodium.
0.4759 moles of NaN₃ is produced
combine molecular weights:
42.021 + 22.990 = 65.011 g/mol
multiply by amount of moles of the limiting reactant:
0.4759 mol *65.011 = 30.942 g
Also, here is the balanced equation:
3N₂ + 2Na = 2NaN₃
The results are the same as the balanced equation.
What physical structure has spines that protect the plant from predators?
Flower
Pistil
Outer covering
Reproductive organs
Answer:
flower hope this helps and have a nice day too!
Explanation:
got a 100 percent on a test.
Answer:
flower
Explanation: