Are the forces on the parachutes balanced?
A. The parachutes fall at a constant speed, so the forces are balanced.
B. There is a change in motion, so the forces are balanced.
C. The parachutes fall at a constant speed, so the forces are unbalanced.
D. There is a change in motion, so the forces are unbalanced.
Answers
Answer:
When the parachute opens, air resistance becomes much greater than gravity. The forces are no longer balanced and this changes her speed.
Explanation:
Eventually the upward force of the air equals the downward force of gravity. When forces are balanced the speed remains constant.
Related Questions
An hcl solution has a ph = 5. if you dilute 10 ml of the solution to 1 l, the final ph will be:________
Answers
The final pH after diluting 10 mL of the HCl solution to 1 L will be 7.
To find the final pH after diluting the HCl solution, we need to use the equation for pH, which is given by pH = -log[H+].
Given that the initial pH of the HCl solution is 5, we can find the concentration of H+ ions using the formula [H+] = 10^(-pH). Substituting the value of pH into the equation, we have [H+] = 10^(-5).
When we dilute 10 mL of the solution to 1 L, we are diluting the HCl solution by a factor of 100. This means that the concentration of H+ ions will also decrease by the same factor.
To calculate the final pH, we need to find the new concentration of H+ ions after dilution. The new concentration can be calculated by dividing the initial concentration by the dilution factor. Therefore, the final concentration of H+ ions is [H+] = (10^(-5)) / 100.
Now, we can find the final pH using the equation pH = -log[H+]. Plugging in the value of the final concentration, the final pH is pH = -log[(10^(-5)) / 100].
Simplifying the expression, we get pH = -log(10^(-7)) = -(-7) = 7.
Therefore, the final pH after diluting 10 mL of the HCl solution to 1 L will be 7.
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What is the net ionic equations of Cu (s) + 2 AgC2H3O2 (aq) --> Cu(C2H3O2)2(aq) + 2 Ag(s) ?
Answers
Answer:
Explanation:
Cu(s) + 2Ag+ ======> Cu^(2+) + Ag(s)
Notice what happened. Silver started out as an ion. It took on 2 electrons that were donated by the copper.
The silver then became a solid ppte. This equation wil take on much more meaning when you take up oxidation and reduction. Until then, you need only know who gave up elections and who took them up.
Is the heat of neutralization the same for any strong acid reacting with any strong base.
Answers
Answer:
yes, enthalpy of neutralization is always constant for a strong acid and a strong base: this is because all strong acids and strong bases are completely ionized in dilute solution. Enthalpy changes in neutralization are always negative-when an acid and alkali react, heat is given out.
Explanation:
Leon is creating a model using the items in the picture below. How could he best improve his model?
O
Earth
Moon
Sun
Make the earth larger than the sun
Make the moon larger than the sun
Make the sun smaller than the earth
Make the moon smaller than the earth
Answers
Make the moon smaller than the Earth.
An insoluble solid that forms from a chemical reaction is called
Answers
Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.
What general trend does electronegativity follow on the periodic table?
Answers
Answer:
On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
Determine if the following reaction is spontaneous or not 25°C by determining the free energy value.
2 NO2(g) yields N2O4(g)
ΔH= -57.2 kJ/mol
ΔS = -175.9 J/ mol•
Answers
Since the Gibbs free energy value (ΔG) is negative (-4.7 kJ/mol), the reaction 2 \(NO_{2}\)(g) yields \(N_{2}O_{4}\)(g) is spontaneous at 25°C.
How to determine the Gibbs Free Energy of a Reaction?Gibbs free energy, denoted as G, is a thermodynamic potential that measures the maximum reversible work that can be done by a system at constant temperature and pressure during a chemical or physical process. The formula for Gibbs free energy is:
ΔG = ΔH - TΔS
where:
ΔG = Gibbs free energy
ΔH = Enthalpy change (-57.2 kJ/mol)
T = Temperature in Kelvin (25°C = 298.15 K)
ΔS = Entropy change (-175.9 J/mol·K)
First, convert ΔS from J/mol·K to kJ/mol·K:
ΔS = -175.9 J/mol·K × (1 kJ/1000 J) = -0.1759 kJ/mol·K
Now, substitute the values into the formula and calculate ΔG:
ΔG = (-57.2 kJ/mol) - (298.15 K × -0.1759 kJ/mol·K)
ΔG = -57.2 kJ/mol + 52.5 kJ/mol
ΔG = -4.7 kJ/mol
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At point R, rocks melt underground to form magma. Which is another process that contributes to the formation of rock at point R?
compacting of sediments on the mountain
cooling as the lava runs down the mountain
weathering of the mountain from the environment
eroding of different rocks at the base of the mountain
Answers
Another process that contributes to the formation of rock at point R is the:
B. Cooling as the lava runs down the mountainAccording to the given question, we need to find another process which can help with the rock formation at point R where the rock melts underground to form magma.
As a result of this, another process through which makes a significant contribution to the formation of rock at point R is the cooling of the lava as the magma which has been melted runs down the mountain.
Therefore, the correct answer is option B
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How many moles of gas are there in a 50. 0 l container at 22. 0 °c and 825 torr?
Answers
2.2311 moles of gas are there in a 50. 0 l container at 22. 0 °c and 825 torrs.
What is an ideal gas?An Ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.
Assuming the gas is ideal, we can solve this problem by using the following equation:
PV = nRT
Where:
P = 825 torr ⇒ 825 / 760 = 1.08 atm
V = 50 L
n = ?
R = 0.082 atm·L·mol⁻¹·K⁻¹
T = 22 °C ⇒ 22 + 273.16 = 295.16 K
We input the data:
1.08 atm x 50 L = n x 0.082 atm·L·mol⁻¹·K⁻¹ x 295.16 K
And solve for n:
24.20312
n = 2.2311 mol
Hence, 2.2311 moles of gas are there in a 50. 0 L container at 22. 0 °c and 825 torrs.
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Urgent!
which element do you think has a greater mass? cadmium or zinc?
Answers
Answer:
zinc
Explanation:
Answer:
cadmium has a greater mass.
explanation:
zincs mass: 65.38
cadmiums mass: 112.411
(ii) Describe another method for making ethanol.
Answers
Answer:
There are essentially three methods used to produce ethanol:
Manufacture from ethene using steam (the "synthetic" route)
Production from sugars and starches by fermentation, using yeasts.
Production from biomass waste, using bacteria.
Please give brainlist if this helped
Points !!!!!!!!!!!!
Answers
Answer:
Point A, Point B, and Point C
Explanation:
Collinear points means that they share the same line. Points A, B, and C all share the line m.
The Valence Electron shell is the first shell next to the nucleus. true or false
Answers
What is the concentration in ppm of chloride in a solution made with 0.808 grams of CaCl2 and 250.0 ml of water?
Answers
Answer:
0.808 g x 1000 = 808 mg.
250 ml/1000 = 0.25 L.
808 mg/0.25 L= 3232 mg/L = ppm.
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The pigment inside chloroplasts that allows photosynthesis to occur in plant cells what is it chlorine, mitochondria, chlorophyll or cytoplasm
Answers
Answer:
Chlorophyll
Explanation:
This is the green pigment that allows photosynthesis to occur
Mitochondria: cell energy
Cytoplasm: what fills the space between organelles in a cell
Chlorine: not sure but you they put it in pools
Why do people who exercise more produce more carbon dioxide ?
Answers
Answer:
When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.
Explanation:
Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
What is exercise?Exercise is characterized as a physiological movement that maintains or enhances total physical wellness. People who exercise are less likely to get diseases and to maintain a healthy weight. Type 2 diabetes, heart disease, high blood pressure, and weight gain can all be warded off with regular exercise. Leaping, jogging, or lifting weights are examples of exercises that can support bone health.
The lungs both provide the body with oxygen, which gives you energy, and remove carbon dioxide from the system, which is a byproduct of energy production. The heart pumps oxygen-rich blood to the working muscles. Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
Thus, because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
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Which of the following is true about tissues and organs?
A. When tissues are combined they make organs.
B. Tissues and organs are the same thing.
C. Organs combine to make tissues.
D. Different tissues can make up the same organ
Answers
Answer:
D
Explanation:
tissues are used to make organs and depending on the organ certain types of tissue can be used
As the amount of charge on two objects increases, the strength of the electrical force between the objects
increases.
decreases.
varies.
remains the same.
Answers
Answer:
Increase is the answer
Explanation:
Increase is the answer hopes this helps you
Given that the amount of charge increases, then, the electrical force between the two objects will also increase
Coulomb's law equationF = Kq₁q₂ / r²
Where
F is the force of attraction K is the electrical constant q₁ and q₂ are two point charges r is the distance apartFrom the Coulomb's equation,
F = Kq₁q₂ / r²
We can see that the force (F) is proportional to the charges (q₁ and q₂).
This simply implies that as q₁ and q₂ increase, F will also increase and as q₁ and q₂ decrease, F will also decrease.
With the above information in mind, we can conclude that the force will increase if the amount of charge on the two objects increases.
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the compound ax2 decomposes according to the equation, 2 ax2(g) → 2 ax(g) x2(g). in one experiment, ax2 was measured at various times, and these data recorded:
Answers
In this given question, the decomposition of the compound ax2 is given by the chemical equation:
2 ax2(g) → 2 ax(g) + x2(g)
This can be read as: Two molecules of AX2 will break down into two molecules of AX and one molecule of X2.
In one experiment, the compound AX2 was measured at various times, and these data were recorded. Since the decomposition reaction is a first-order reaction, the data can be used to determine the rate constant k. The first order reaction is a type of chemical reaction in which the reaction rate depends on the concentration of only one reactant. For a first-order reaction, the rate equation is:
Rate = k [A]
Here, A represents the reactant, and k is the rate constant. The rate constant for a first-order reaction is a constant that depends only on the temperature of the reaction. It has units of s−1.In the experiment, the concentration of AX2 was measured at various times. These data can be used to determine the rate constant k. If we plot the natural logarithm of the concentration of AX2 versus time, we get a straight line whose slope is equal to -k. The equation for this line is:
ln [AX2] = -kt + ln [AX2]0
Here, [AX2] is the concentration of AX2 at time t, [AX2]0 is the initial concentration of AX2, and k is the rate constant. The value of k can be calculated from the slope of the line. If we know the value of k, we can calculate the half-life of the reaction, which is the time it takes for the concentration of AX2 to be reduced to half its initial value. The half-life of a first-order reaction is given by:
t1/2 = ln 2/k
The decomposition of the compound AX2 can be used to calculate the rate constant of the reaction using the given chemical equation:
2 ax2(g) → 2 ax(g) + x2(g)
This can be read as: Two molecules of AX2 will break down into two molecules of AX and one molecule of X2.
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Please answer this two questions as fast as you can
Answers
Explanation:
new Mexico and Louisiana
Answer: two two
Explanation:
Problem #1 : Radioisotopes are used for a variety of medical purposes including as cancer treatments. Attaching an alpha emitter to an antibody allows for a targeted therapy which can be less damaging to healthy tissue than some other cancer treatments. One such alpha emitter is Astatine 211 (211At) which undergoes LaTeX: \alpha α decay (hence the name, alpha emitter).
1.) What isotope is created by the LaTeX: \alpha α decay of 211At? 2.) How many p+, n0, and e- does it have?
Problem #2 : The grand dream of the protoscience called Alchemy was the transmutation of Lead (Pb) into Gold (Au). Thousands of years later, surely we can do better... after all, Platinum (Pt) is what everyone wants these days. We'll start with an isotope of lead, 209Pb which undergoes LaTeX: \beta β - decay. In reality, that is the end of our tale. However, this is a thought exercise and we can do what we want. Using the different types of radioactive decay described above, but still starting with LaTeX: \beta β - decay, how could we get 209Pb to Pt?
1.) What isotope is created by the LaTeX: \beta β - decay of 209Pb?
2.) Come up with a sequence of radioactive decay steps that would then lead to an isotope of Pt.
3.) What isotope of Pt did you create? How many p+, n0, and e- does it have?
Answers
Answer and Explanation: Many nuclei are radioactive, which means they emit particles to become stable. In the process, they also become a different element. There are 3 types of decay:
Alpha decay: it emits a particle of Helium, i.e., emits a particle with 2 as atomic number (Z) and 4 as atomic mass (A);Beta decay: emits an electron: a particle with 0 mass and -1 as atomic number;Gamma decay: emits a high energy form of electromagnetic radiation and it is extremely dangerous and penetrating;Problem #1:
1.) Astatine: Z = 85 and A = 211
Alpha decay: \({{A=211} \atop {Z=85}} \right. At\) ⇒ \({{207} \atop {83}} \right. Bi + {{4} \atop {2}} \right. \alpha\)
The isotope created is Bismuth
Characteristics: Z = 83; e⁻ = 83; n = A - Z = 207 - 83 = 124
The isotope is Bismuth with 83 protons, 83 electrons and 124 neutrons.
Problem #2
1.) Lead: Z = 82 and A = 82
Beta decay: \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)
The isotope created is talium.
2.) \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)
\({{209} \atop {81}} \right. Tl\) ⇒ \({{205} \atop {79}} \right. Au+{{4} \atop {2}} \right. \alpha\)
\({{205} \atop {79}} \right. Au\) ⇒ \({{205} \atop {78}} \right. Pt+{{0} \atop {-1}} \right. \beta\)
3.) The isotope created is \({{205} \atop {78}} \right. Pt\).
p⁺ = 78; e⁻ = 78; n = 127
The isotope created ahs 78 protons, 78 electrons and 127 neutrons.
Petrol is the fuel used in many car engines
Research is being carried bout into the use of hydrogen instead of petrol
Evaluate the advantages and disadvantages of using hydrogen rather than petroleum as s fuel for cars
Answers
Pros: The only vehicle emissions are water vapor. equivalent to roughly twice the fuel economy of gasoline vehicles. Hydrogen is plentiful, and can be produced using environmentally friendly power.
Cons: It costs a lot to use this space-age technology.
What are the impediments of hydrogen vehicles?Since hydrogen is flammable, handling or storing it improperly poses a risk. For use on the road, hydrogen must be extremely compressed. This makes things even more complicated, and any network that distributes hydrogen needs to be able to handle this high-pressure gas. The industrial production of hydrogen necessitates a significant amount of fossil fuels.
Why is it not possible to fuel cars with hydrogen?Due to the high density of energy required for its production and the lack of funding and support from governments, the majority of automobile manufacturers have rejected hydrogen, preventing the hydrogen revolution from expanding further.
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Explain the process of how James Chadwick
found the neutron.
Answers
Answer:
In 1932, the physicist James Chadwick conducted an experiment in which he bombarded Beryllium with alpha particles from the natural radioactive decay of Polonium. The resulting radiation showed high penetration through a lead shield, which could not be explained via the particles known at that time.
Explanation:
a solution is prepared by adding 0.10 mol of lithium nitrate, lino3, to 1.00 l of water. which statement about the solution is correct? a) the solution is basic. b) the solution is neutral. c) the solution is strongly acidic. d) the solution is weakly acidic. e) the values for ka and kb for the species in solution must be known before a prediction can be made
Answers
The correct option is (b) the solution is neutral. The solution is prepared by adding 0.10 mol of \(LiNO_3\) to 1.00 L of water is a neutral solution.
Lithium nitrate (\(LiNO_3\)) is an ionic compound that dissociates into ions when dissolved in water:
\(LiNO_3\) → \(Li^+\) (aq) + \(NO_3^-\)(aq)
\(Li^+\) and \(NO_3^-\) are both spectator ions, which means they don't participate in acid-base reactions. Therefore, the acidity of the solution will be determined by the reaction between water and the remaining ions.
Since neither \(Li^+\) nor \(NO_3^-\) reacts with water, the solution will be neutral. It is important to note that the \(K_a\) and \(K_b\) values of the species in solution do not need to be known in order to predict the acidity of the solution, since \(Li^+\) and \(NO_3^-\) are both spectator ions and do not participate in acid-base reactions.
Therefore, the correct option is (b) the solution is neutral.
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You collected a sample of hydrogen gas in an inverted buret by displacement of water at 23.5 °C. The buret could not be submerged deep enough in the water bath to equalize pressure. The water level in the buret was 9.35 cm above the water level in the water bath. The volume of gas in the buret was determined to be 40.55 ml. a. If the current atmospheric pressure was 29.14 in of Hg, what is the pressure of dry hydrogen in the buret? Show work. b. How many moles of hydrogen are in this sample? Show work.
Answers
The pressure of dry hydrogen in the buret is 97763.1 Pa. There are approximately 162.77 moles of hydrogen in this sample.
The pressure difference between the water level in the buret and the atmospheric pressure can be determined using the equation P = ρgh, where P is the pressure difference, ρ is the density of water, g is the acceleration due to gravity, and h is the height difference in the water levels.
First, we converted the height difference from centimeters to meters:
h = 9.35 cm = 0.0935 m
The density of water (ρ) is approximately 1000 kg/m³, and the acceleration due to gravity (g) is approximately 9.8 m/s². Putting in these values, the pressure difference is:
P = (1000 kg/m³) (9.8 m/s²)(0.0935 m) = 916.3 Pa
We then converted the atmospheric pressure from inches of mercury to pascals. Since 1 inch of mercury (in Hg) is approximately 3386.39 pascals, the atmospheric pressure is:
29.14 inHg (3386.39 Pa/in Hg) = 98679.4 Pa
So, the pressure of dry hydrogen in the buret:
= Atmospheric pressure - Pressure difference
= 98621.7 Pa - 916.3 Pa = 97763.1 Pa
For the number of moles of hydrogen in the sample, we use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Volume of gas (V) = 40.55 ml = 0.04055 L
Pressure of dry hydrogen (P) = 97763.1 Pa
Temperature (T) = (23.5 °C = 23.5 + 273.15)K = 296.65 K
The ideal gas constant (R) is approximately 0.0821 L atm/(mol K).
Plugging in these values, we can solve for the number of moles (n):
PV = nRT
\(\implies (97763.1 Pa)(0.04055 L) = (n)(0.0821 L \cdot atm/(mol \cdot K))(296.65 K)\)
\(\implies \frac {(97763.1 Pa)(0.04055 L)}{(0.0821 L \cdot atm/(mol \cdot K))(296.65 K)}= n\)
So, n=162.77.
Therefore, there are approximately 162.77 moles of hydrogen in this sample.
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A 3. 8
g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10. 5
g. The two substances react, releasing carbon dioxide gas to the atmosphere. After the reaction, the contents of the reaction vessel weigh 11. 7
g. What is the mass of carbon dioxide released during the reaction?
Answers
The mass of carbon dioxide released during the reaction is 2.6 grams.
To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.
Before the reaction:
Mass of NaHCO3 = 3.8 g
Mass of acetic acid = 10.5 g
Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g
After the reaction:
Mass of the contents of the reaction vessel = 11.7 g
To find the mass of carbon dioxide released, we calculate the difference in mass:
Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel
= 14.3 g - 11.7 g
= 2.6 g
Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.
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Pressure conversions
145.53kPa to atm
Answers
Answer:
1.436atm
Explanation:
What does the atomic mass of an element represent?
Answers
Answer: the total number of protons and neutrons in an atom
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What does it mean to neutralize a chemical solution?
Answers
Answer:
A neutralized solution in chemistry refers to the reaction between an acid and base that results in a neutral balance, or a measure of 7 on the pH scale.
Explanation:
it is the minimum amount of solute that can be dissolved in the solvent
A. Salt Solution C. Saturated Solution
B. Sugar Solution D.
Answers
Answer:A
Explanation: