2) Which of the following statements are true about energy and matter?
The transfer of energy through empty space can be by radiation.
Conduction is heat transfer by direct contact of particles of matter.
Conduction is the transfer of heat by the movement of a heated fluid.
Density is a measure of how much mass there is in a volume of a substance.
The movement of energy from a warmer object to a cooler object is called heat
transfer.
Answers
Answer:
the transfer through empty space can be radiation
Explanation:
because when it transfers it turns into radiation
Related Questions
What will be volume of real gas changes if pressure is incresed 500 atm and temperature decreases to 0C
Answers
To determine the change in volume of a real gas when the pressure is increased to 500 atm and the temperature decreases to 0°C, we need additional information such as the initial conditions of the gas (pressure, temperature, and volume). Without these initial conditions, it is not possible to calculate the exact change in volume.
However, we can use the ideal gas law as an approximation to estimate the change in volume under these conditions. The ideal gas law equation is given as:
PV = nRT
Where:
P = Pressure
V = Volume
n = Number of moles
R = Ideal gas constant
T = Temperature
Assuming the gas behaves ideally, we can rearrange the equation to solve for volume:
V = (nRT) / P
To calculate the change in volume, we need the initial volume, initial pressure, initial temperature, and the number of moles of the gas. Once we have these values, we can plug them into the equation and calculate the initial volume.
Please provide the initial conditions of the gas (pressure, temperature, volume, and number of moles) for a more accurate calculation of the volume change.
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If a shell can hold a maximum of 32 electrons, what is the value of n?
2
3
4
5
Answers
Answer:4
Explanation:
Answer:
c.4 Just took the test!!!
Explanation:
How much heat, in joules, is required to raise the temperature of 8.2 g of
water by 3.32°C? (Specific heat of water is 4.18 J/gºC) Your answer should be
rounded to one number after the decimal and does not need units; Example
0.1*
Answers
Answer:
113.8 J.
Explanation:
The following data were obtained from the question:
Mass (M) = 8.2 g
Change in temperature (ΔT) = 3.32 °C
Specific heat capacity (C) = 4.18 J/gºC
Heat required (Q) =..?
The heat required to raise the temperature of the water by 3.32 °C
can be obtained as follow:
Q = MCΔT
Q = 8.2 × 4.18 × 3.32
Q = 113.8 J
Therefore, the amount of heat required to raise the temperature of the water is 113.8 J.
Match the following.
1.
an agreement to temporarily cease fighting
recession
2. an economic setback in commercial and industrial activity
reparations
3. indemnities paid by defeated countries for acts of war
armistice
Answers
Answer:
The answer is number 1
Explanation:
this is because cease means to stop,and recession also means to squeeze
A system releases 3.0 kJ of heat while 9.5 kJ of work is done on it. Calculate ΔE
Answers
Answer: A system that is giving off 65.0 kJ of heat and is performing 855 J of work on the surroundings has a change in the internal energy of -65.9 kJ.
Explanation: The system is giving off 65.0 kJ of heat (Q). By convention, when a system is releasing heat, Q < 0. Then, Q = -65.0 kJ.
The system is also performing 855 J of work (W) on the surroundings. By convention, when a system performs work on the surroundings, W < 0. Then, W = -855 J (-0.855 kJ)
According to the First Law of Thermodynamics, we can calculate the change in the internal energy (ΔE) of the system using the following expression.
A system that is giving off 65.0 kJ of heat and is performing 855 J of work on the surroundings has a change in the internal energy of -65.9 kJ.
Would a rollercoaster have the greatest kinetic energy at the top of the highest hill or at the bottom on the highest hill
Answers
Answer:
The rollercoaster has the lowest kinetic energy at the top of the hill.
The rollercaoster has the highest kinetic energy at the bottom of the hill.
Explanation:
The kinetic energy of any solid body in motion is usually computed using this formula:
K.E = \(\frac{1}{2}mv^2\)
From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.
We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.
This means that the variations in the K.E are mainly coming from its velocity.
At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.
However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.
Temperature and humidity levels need to be monitored and recorded
(A) weekly, preferably daily.
(B) for each shift.
(C) at least daily.
(D) at least monthly.
Answers
To maintain accurate and consistent data on temperature and humidity levels, they should be monitored and recorded (C) at least daily.
Monitoring temperature and humidity levels is crucial for various applications, such as ensuring optimal working conditions, preserving perishable goods, and maintaining proper indoor air quality. By recording these levels daily, you can quickly identify any fluctuations or issues that may arise and take appropriate action. While weekly or monthly checks may provide some information, daily monitoring is the most effective way to stay on top of environmental conditions.
To achieve the best results and maintain an optimal environment, temperature and humidity levels should be monitored and recorded at least daily.
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What is the percent yield of ferrous sulfide if the actual yield is 220.0 g and the theoretical yield is 275.6 g? Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100.. 12.5% 55.6% 79.8% 87.9%
Answers
Answer:
79.8%
Explanation:
Percentage yield = actual yield / theoretical yield x 100%
Percentage yield = 220.0 / 275.6 x 100%
=79.8%
The percent yield of of ferrous sulfide if the actual yield is 220.0 g and the theoretical yield is 275.6 g is 79.8%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
In the given example, percent yield can be found out by substituting values in mentioned formula. percent yield,=220/275.6×100=79.8%.
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why can't you see the salt in seawater
Answers
The simple awnser is that it dissolved.
Calculate the expected pH values of the buffer systems from the experiments (a, b, c, d) using the Henderson-HAsselbach equation, pH= pKa + log([A-]/[HA]). Use for pKa values carbonic acid = 6.37 and acetic acid=4.75
for A 5 ml 0.1 M CH3COOH + 5 mL 0.1 M CH3COO-NA+ pH 4.1 after addition of 0.5mL 0.1 M HCL pH is 4.2 after addition of 0.5 mL 0.1 M NaOH pH is 4.1
for B 1mL M CH3COOH + 10 mL 0.1 M CH3COO-Na+ pH is 5.2 after addition of 0.5 mL 0.1 M HCL pH is 5.1 after addition of 0.5 mL 0.1 NaOH pH is 6.0
for C 5mL 0.1 M H2CO3 + 5mL 0.1 M NaHCO3 pH is 9.2 after addition of 0.5 mL 0.1 M HCL pH is 8.9 after addition of 0.5 mL 0.1 M NaOH pH is 9.5
for D 1mL 0.1 M H2CO3 + 10mL 0.1 M NaHCO3 pH is 8.6 after addition of 0.5 mL o.1 M HCl pH is 7.5 after addition of 0.5 mL 0.1 M NaOH pH is 9.0
Answers
The expected pH values of the buffer systems from the experiments are: A: 4.75 ; B: 4.25 ; C: 6.37 ; D: 5.77.
To calculate the expected pH values of the buffer systems from the experiments (a, b, c, d) using the Henderson-Hasselbalch equation, pH= pKa + log([A⁻]/[HA]), we need to first determine the [A⁻]/[HA] ratio for each experiment.
For experiment A, we have:
[A⁻]/[HA] = [CH₃COO⁻]/[CH₃COOH] = (0.1 M)/(0.1 M) = 1
pH = pKa + log([A⁻]/[HA]) = 4.75 + log(1) = 4.75
The expected pH value for experiment A is 4.75.
For experiment B, we have:
[A⁻]/[HA] = [CH₃COO⁻]/[CH₃COOH] = (0.1 M)/(1.0 M) = 0.1
pH = pKa + log([A⁻]/[HA]) = 4.75 + log(0.1) = 4.25
The expected pH value for experiment B is 4.25.
For experiment C, we have:
[A⁻]/[HA] = [HCO₃⁻]/[H₂CO₃] = (0.1 M)/(0.1 M) = 1
pH = pKa + log([A⁻]/[HA]) = 6.37 + log(1) = 6.37
The expected pH value for experiment C is 6.37.
For experiment D, we have:
[A⁻]/[HA] = [HCO₃⁻]/[H₂CO₃] = (0.1 M)/(1.0 M) = 0.1
pH = pKa + log([A⁻]/[HA]) = 6.37 + log(0.1) = 5.77
The expected pH value for experiment D is 5.77.
In summary, the expected pH values of the buffer systems from the experiments are:
A: 4.75
B: 4.25
C: 6.37
D: 5.77
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How many grams of NaCl can be produced by
the reaction of 112cm³ of chlorine at STP wit
an excess of sodium?
Answers
Answer:
The reaction of 112 cm³ of chlorine at STP with an excess of sodium can produce 0.292 grams of NaCl.
Explanation:
The reaction of chlorine with sodium can produce sodium chloride (NaCl), which is also known as table salt. To determine how many grams of NaCl can be produced by this reaction, we need to know the molar mass of NaCl and the number of moles of chlorine that are reacted.
The molar mass of NaCl is 58.44 g/mol. This means that 1 mole of NaCl has a mass of 58.44 grams.
To find the number of moles of chlorine that are reacted, we need to convert the volume of chlorine from cubic centimeters (cm³) to liters, and then use the ideal gas law to calculate the number of moles. At standard temperature and pressure (STP), 1 mole of any gas occupies a volume of 22.4 liters. Therefore, the number of moles of chlorine can be calculated as follows:
moles = (volume of chlorine at STP) / (volume of 1 mole of any gas at STP)
In this case, the volume of chlorine is 112 cm³, which is equivalent to 0.112 liters at STP. Therefore, the number of moles of chlorine can be calculated as follows:
moles = 0.112 liters / 22.4 liters/mol
This gives a result of 0.005 moles of chlorine.
Since the reaction produces an excess of sodium, we can assume that all of the chlorine that is reacted is converted into NaCl. Therefore, the mass of NaCl that is produced can be calculated by multiplying the number of moles of chlorine by the molar mass of NaCl:
mass = (number of moles) * (molar mass of NaCl)
In this case, the mass of NaCl that is produced is 0.005 moles * 58.44 g/mol = 0.292 grams.
Therefore, the reaction of 112 cm³ of chlorine at STP with an excess of sodium can produce 0.292 grams of NaCl.
Use the References to access important values if needed for this question. Enter electrons as e-.
A voltaic cell is constructed from a standard Pb2+|Pb Half cell (E° red = -0.126V) and a standard F2|F- half cell (E° red = 2.870V). (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
The anode reaction is:___________
The cathode reaction is:__________
The spontaneous cell reaction is:__________
The cell voltage is ___________V
Answers
We know the standard reduction potentials of the half-cells involved, so we can find the cell voltage and the spontaneous reaction. Thus;
The anode reaction is:
Pb(s) → Pb2+(aq) + 2e-
This is the oxidation half-reaction that occurs in the Pb half-cell.
The cathode reaction is:F2(g) + 2e- → 2F-(aq).
This is the reduction half-reaction that occurs in the F2 half-cell.
The spontaneous cell reaction is
:Pb(s) + F2(g) → Pb2+(aq) + 2F-(aq).
This is the combination of the oxidation and reduction half-reactions, with the electrons canceled out from both sides.
The cell voltage is 2.996 V The standard cell potential is calculated as follows:
standard cell potential = E°(reduction) - E°(oxidation)standard cell potential = 2.870 V - (-0.126 V)standard cell potential = 2.996 V, The cell voltage is positive, indicating that the reaction is spontaneous.
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The overall reaction in a chemical cell is: Zn(s)+Cu2+(aq)→Zn2+(aq)+Cu(s)Zn(s)+Cu 2+(aq)→Zn 2+(aq)+Cu(s) As the reaction takes place the: (1) mass of the Zn(s) electrode decreases(2) mass of the Cu(s) electrode decreases, (3) Cu2+Cu 2+concentration stays the same, (4) Zn2+Zn 2+ concentration stays the same.
Answers
The correct options are (1) and (4). During the reaction, the mass of the Zn(s) electrode decreases as it is oxidized, and the mass of the Cu(s) electrode increases as it is reduced.
In a chemical cell, a redox reaction occurs, and the electrons are transferred from one electrode to another. In this case, the reaction is:
Zn(s) + Cu2+(a q) → Zn2+(a q) + Cu(s)
At the anode, which is the electrode where oxidation occurs, Zn atoms lose electrons and form Zn2+ ions in solution:
Zn(s) → Zn2+(a q) + 2e-
These electrons flow through an external wire to the cathode, where they are accepted by Cu2+ ions and copper metal is deposited:
Cu2+(a q) + 2e- → Cu(s)
Which means that during the reaction, the mass of the Zn(s) electrode decreases as it is oxidized, and the mass of the Cu(s) electrode increases as it is reduced. The concentration of Cu2+ ions in solution stays the same, as it is not involved in the electrode reactions. The concentration of Zn2+ ions in solution increases as Zn(s) is oxidized to form Zn2+ ions. The correct answers are (1) and (4).
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Thor pushes a car with a mass of 2500 kg. It accelerates 5 m/s2. How much force did Thor apply?
Answers
Answer:
The answer is 12500 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 2500 × 5
We have the final answer as
12500 NHope this helps you
Which of the following is the formula of a
compound?
(1) Fr
(2) Mn
(3) LiH
(4) 03
Answers
LiH is the formula of a compound while other options are elements
What is an element?
It is a pure substance which is made up of only one kind of atom and can't be broken into two or more simpler substances by physical or chemical meansexample- Carbon, hydrogen, gold, silver and iron Every element consists of only one atom form.What are compounds?
They are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.Example - Water is a compound. Water has chemical name H2O, because it contains two hydrogen atoms and one oxygen atom chemically bonded together.Elements are pure substances which are composed of only one type of atom while Compound are substances which are formed by two or more different types of elements which are united chemically in fixed proportions.
Here, Fr is an element Francium and Mn is the element Manganese, while LiH is Lithium Hydride. LiH is a compound
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the rotation of a double bond is restricted, so geometric or cis/trans isomers can be formed.
Answers
The statement “the rotation of a double bond is restricted, so geometric or cis/trans isomers can be formed” is true. In the organic chemistry field, geometric or cis/trans isomers refer to a type of stereoisomerism. The double bond is one of the most vital functional groups found in organic compounds.
Its presence often indicates chemical reactivity and it can significantly impact the physical properties of compounds with its restricted rotation around its axis. It restricts the rotation because of the presence of a double bond, which has a higher degree of electron density than the single bonds found in saturated hydrocarbons. This bond has been found to repel electron-rich groups or atoms on opposite sides of the double bond.
Due to these restrictions in the rotation of the double bond, geometric isomers can form. These isomers are also known as cis-trans isomers. These isomers arise from the restricted rotation of substituent groups surrounding a double bond, resulting in the molecule having two or more arrangements that are mirror images of each other. The isomers are named “cis” and “trans” to differentiate between them.
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what is the proper method to determine the mass number of an isotope
Answers
Answer:
Subtract the atomic number (the number of protons) from the rounded atomic weight. This gives you the number of neutrons in the most common isotope. Use the interactive periodic table at The Berkeley Laboratory Isotopes Project to find what other isotopes of that element exist.
Explanation:
Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.
Propane (C3H8) reacts with oxygen (O2) during a combustion reaction, producing carbon dioxide
(CO2) and water (H2O).
Which equation demonstrates the law of conservation of matter for this reaction?
Answers
Answer:
C3H8 + 5 O2 ------> 3 CO2 + 4 H2O
Explanation:
32.30 mL of 0.220 M H2SO4(aq) are titrated with 46.30 ml of a NaOH solution. What is the molarity of the NaOH(aq)? Show your work. 32,3004,220m) = (46.30 mL/CM). 46-30 m 46.30 mL
Answers
The molarity of the NaOH(aq) solution is 0.156 M.
The balanced equation for the reaction between sulfuric acid and sodium hydroxide is H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l). From the balanced equation, it can be deduced that the mole ratio of NaOH to H₂SO₄ is 2:1. Hence, the moles of H₂SO₄ reacted = Molarity of H₂SO₄ × Volume of H₂SO₄ used in liters = 0.220 M × 0.03230 L = 0.007106 moles.
Using mole ratio, the moles of NaOH reacted = 2 × 0.007106 = 0.01421 moles. Molarity of NaOH = Moles of NaOH / Volume of NaOH used in liters= 0.01421 moles / 0.04630 L = 0.306 M or 0.156 M (rounded off to three significant figures). Thus, the molarity of the NaOH(aq) is 0.156 M.
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What is considered the human body's largest organ?
Answers
Answer:
The skin
Explanation:
The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.
calculate [ oh− ] for a solution where [h3o ]=0.00409 m
Answers
The concentration of OH⁻ ions in the solution is approximately 2.44 x 10⁻¹² M.
To calculate the [OH⁻] for a solution where [H₃O⁺] = 0.00409 M, you can use the ion product of water (Kw). Here are the steps:
1. The product of the concentrations of H3O+ and OH- is always equal to 1.0 × 10^-14 at 25°C.
Using this relationship, we can calculate the concentration of OH- from the given concentration of H3O+:
[H3O+][OH-] = 1.0 × 10^-14
[OH-] = 1.0 × 10^-14 / [H3O+]
[OH-] = 1.0 × 10^-14 / 0.00409
[OH-] = 2.44 × 10^-12 M
Calculating the [OH⁻], we get:
[OH⁻] ≈ 2.44 x 10⁻¹² M.
So, the concentration of OH⁻ ions in the solution is approximately 2.44 x 10⁻¹² M.
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What are all of the ways can use the atomic number to find information about an atom?
Answers
Answer:
The symbol for an atom can be written to show its mass number at the top, and its atomic number at the bottom. To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number.
Calculate the ph of the solution upon the addition of 0. 015 mol of naoh to the original buffer.
Answers
The original buffer contains 0.025 moles of NH3 and 0.015 moles of NH4Cl per liter of solution. The equation for the dissociation of NH4Cl is NH4Cl ⇌ NH4+ + Cl- and for the dissociation of NH3 is NH3 + H2O ⇌ NH4+ + OH-. The pH of the solution upon the addition of 0.015 mol of NaOH to the original buffer can be calculated as follows:Step-by-step solution:
First, calculate the initial moles of NH4+ in the original buffer:Initial moles of NH4+ = 0.015 mol/L × 1.00 L = 0.015 mol/LInitial moles of NH4+ = 0.015 mol/L × 1.00 L = 0.015 mol/LNH4+ comes from NH4Cl. NH3 and NH4+ are in equilibrium as NH3 is a weak base, and NH4+ is its conjugate acid. So, [NH4+] = [NH4Cl] = 0.015 mol/L.Next, calculate the initial moles of NH3 in the original buffer:Initial moles of NH3 = 0.025 mol/L × 1.00 L = 0.025 mol/LNH3 + H2O ⇌ NH4+ + OH-The reaction is an equilibrium reaction. The equilibrium constant expression is:Ka = [NH4+][OH-]/[NH3]Now, let's create an ICE table:Before Reaction:NH3 + H2O ⇌ NH4+ + OH-Initial (mol/L) 0.025 0 0Change (mol/L) -x 0 +xEquilibrium (mol/L) 0.025 - x 0 xFrom the ICE table, [NH4+] = x and [OH-] = x. So, we can write the following:Ka = [NH4+][OH-]/[NH3]Ka = x2/(0.025 - x)
The pH is calculated by taking the negative logarithm of the concentration of H+. The concentration of H+ is determined by the concentration of OH-, which was produced from the reaction between NaOH and NH4+.OH- reacts with H+ to form water (H2O). NaOH is a strong base, and it completely dissociates in solution, as given below:NaOH → Na+ + OH-At the equilibrium, the moles of OH- added is equal to the moles of H+ used up from NH4+: moles of OH- added = 0.015 mol/L. Therefore, the concentration of OH- is:OH- = moles/L = 0.015 mol/LThe new moles of NH4+ and NH3 are calculated as follows:Moles of NH4+ = 0.015 mol/L + xMoles of NH3 = 0.025 mol/L - xKa = x2/(0.025 - x)0.0000174 = x2/(0.025 - x)x = 0.0028 mol/LMoles of NH4+ = 0.015 mol/L + x = 0.015 mol/L + 0.0028 mol/L = 0.0178 mol/LMoles of NH3 = 0.025 mol/L - x = 0.025 mol/L - 0.0028 mol/L = 0.0222 mol/LNow, the concentration of H+ is calculated using the following equation:Kw = [H+][OH-]Kw = 1.0 × 10-14 = [H+][0.015]0.015 × 10-14 = [H+]pH = -log[H+]pH = -log(0.015 × 10-14)pH = 13.82Therefore, the pH of the solution upon the addition of 0.015 mol of NaOH to the original buffer is 13.82.
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how long does it take to thaw a 16 lb frozen turkey?
Answers
Answer:
4-5 days
Explanation:
The charge of electron cloud of Atom x equals to - 4x10to the power-18 C, write the atomic representation knowing that it has 30 neutrons.
Answers
Answer:
the most common oxidation no.of manganese is + 2 + 3 + 4 + 6 + 7
Explanation:
1. Why is the box sitting on the table not moving?
a) No forces are acting on the box
b) The table pushes up the same force that gravity pushes down
c) Gravity is keeping the box down
d) Gravity is pulling down, but the table is in the way
Answers
Problem #1: Calculate the decrease in temperature (in Celsius) when 5.00 L at 33.0 °C is compressed to 1.00 L.
Answers
When the gas is compressed from 5.00 L to 1.00 L, the temperature decreases by approximately 244.92 °C. To calculate the decrease in temperature when a gas is compressed, we can use the combined gas law formula: P₁ * V₁ / T₁ = P₂ * V₂ / T₂
Assuming the pressure remains constant during the compression, we can cancel out P₁ and P₂:
V₁ / T₁ = V₂ / T₂
Given the initial volume (V₁) is 5.00 L and the initial temperature (T₁) is 33.0 °C, we must first convert the temperature to Kelvin:
T₁ = 33.0 °C + 273.15 = 306.15 K
The final volume (V₂) is given as 1.00 L. We need to find the final temperature (T₂):
V₁ / T₁ = V₂ / T₂
T₂ = V₂ * T₁ / V₁ = 1.00 L * 306.15 K / 5.00 L = 61.23 K
Now, convert T₂ back to Celsius:
T₂ = 61.23 K - 273.15 = -211.92 °C
The decrease in temperature is the difference between the initial and final temperatures:
Decrease in temperature = T₁ - T₂ = 33.0 °C - (-211.92 °C) = 244.92 °C
So, when the gas is compressed from 5.00 L to 1.00 L, the temperature decreases by approximately 244.92 °C.
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which is more reactive oxygen or hydrogen? explain why?
Answers
Answer:
Explanation:
Which is more reactive hydrogen or oxygen?
Hydrogen is not particularly reactive. For example, just mixing hydrogen and oxygen gas will not cause a reaction at room temperature, but many metal elements oxidize at least on the surface in air. ... It is combustible because oxygen wants electrons and takes them from hydrogen to form water.
The correct coefficients needed to balance the following reaction are:
___ PbI2 + ___ ZnS → ___ PbS + ___ZnI2
a) 1, 2, 2, 1
b) 1, 1, 1, 1
c) 1, 1, 2, 2
d) 2, 1, 1, 2
Answers
If a response is towards a stimulus it's described as _______; if a response is away from the stimulus it's described as _____.
Answers
Answer: Positive tropism, negative tropism
Explanation:
Stimulus can be define as external and internal agent which generate a response in an organism. If the growth and action is towards the stimulus it is called as positive tropism. If the growth and action is away from the stimulus it is called as negative tropism. Example, the growth of the stem towards the sunlight is called positive tropism whereas the growth of the root away from the sunlight is called negative tropism. Here, sunlight is the stimulus.