Answer
C
Explanation:
If the athlete can run 9 kilometers in one hour, and thirty minutes is half an hour, then you divided the distance the athlete can run(9 kilometers) by 2, getting 4.5 kilometers in 30 minutes. Hope this helped.
Logic Puzzle: Determine the concentration in the eye dropper. Write the steps below. What is the concentration of the solution in the Eyedropper?
To determine the concentration of a solution, you need to first measure the volume of the solution, then calculate the moles of solute present. After these measurements, divide the number of moles of solute by the volume of the solution in liters to get the molarity. For dilutions, use the formula M1V1 = M2V2.
Explanation:To determine the concentration of the solution in the eyedropper, we would use the concept of molarity and possibly dilution. As presented in the instructional guidelines:
The first step would be to measure the volume of the solution using a graduated cylinder, or in this case, the volume within the eyedropper. This process involves reading the measurement at the bottom of the meniscus. Following this, you should calculate the number of moles of the solute present in the solution. Here, two examples were given: moles of a generic solute (0.63 mol solute in a 1.00 kg solvent) and moles of hemoglobin. To determine this, you would need to know the mass of the solute that was dissolved and the molar mass of the solute to convert from grams to moles. To finally determine the molarity (concentration) of the solution, one would divide the number of moles of solute by the volume of the solution (in liters). If the problem involves a dilution, you would use the formula M1V1 = M2V2 where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume. With this, you would be able to calculate the molarity after dilution.Learn more about Molarity here:
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In Eyedropper the 1:10 solution is more concentrated than the 1:20 solution.
The concentration of the unknown solution in the eyedropper, follow these steps:
Perform a Serial Dilution: Take a known volume of the concentrated solution and dilute it step-by-step. For example, if you are preparing six different solutions, draw a diagram showing the volume withdrawn from the concentrated solution and the volume of water added at each step.Measure Observations: Record what happens in each test tube. Note any color changes or reactions.Calculate Final Concentration: Use the formula for dilution: C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume after dilution. For example, if you start with a concentration of 1.3 x [tex]10^-^4[/tex] M and dilute 2.0 mL to a final volume of 10.00 mL, the new concentration is calculated as follows:C2 = (C1 * V1) / V2 = (1.3 x [tex]10^-^4[/tex] M * 2.0 mL) / 10.0 mL = 2.6 x[tex]10^-^5[/tex] M
Ensure you rinse the beaker, funnel, and inside of the volumetric flask with water to avoid contamination. Finally, when adding the last few drops of water to the solution, make sure your eyes are level with the graduation mark to ensure accurate volume measurement.
Questions and Discussion
More Concentrated Solution: The 1:10 hydrochloric acid solution is more concentrated than the 1:20 solution.Standard Solution Concentration: Based on the example, the standard solution concentration can be calculated similarly to the above example.Describe how a cold front affects weather.
THIS IS A SCIENCE QUESTION NOT A CHEMISTRY QUESTION! Why does the same side of the moon always face Earth?
the rotational period of Earth is the same as that of the moon
the rotational period of Earth is equal to one revolution around Earth
the rotational period of the moon is equal to one revolution around Earth
the rotational period of the moon is different than one revolution around Earth
Answer:yes
Explanation:Because yes
Answer:
C.
Explanation:
Use the drop-down menus to identify whether each description represents a convex lens, a concave lens, or both.
Has a focal point:
Is thicker in the middle than near the edges:
Creates only a right-side-up image:
Causes light rays passing through it to refract:
Answer:
both
convex lens
concave lens
both
Explanation:
Answer:
A concave lens is
✔ thinner
in the middle than at the edges, and causes light rays to
✔ diverge
.
A convex lens is
✔ thicker
in the middle than at the edges, and causes light rays to
✔ converge
.
Explanation:
SUU
What explains the key difference between a bomb calorimeter and a coffee cup calorimeter?
A bomb calorimeter is 10 times larger but works the same way
A bomb calorimeter measures heat for liquid products only
A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that
do not occur in water.
A bomb calorimeter can measure heat gain or loss in gaseous reactions but is not useful for reactions that occur at high
pressures and temperatures.
Save and Exit
RE
Mark this and retum
Answer: The answer is C
Explanation:
A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.
The third option is correct.
The following information should be considered:
In the case of bomb calorimeters it have the distinct chamber for holding the substance. Also it determined the heat gain or loss with respect to the reactions that does not arise in the water.learn more: https://brainly.com/question/17429689?referrer=searchResults
41.6 mL of an HCIO2 solution were
titrated with 14.85 mL of a 0.146 M.
NaOH solution to reach the
equivalence point. What is the
molarity of the HClO2 solution?
Answer:
0.0521 M
Explanation:
HClO2 + NaOH ---> NaClO2 + H2O
M(HClO2)V(HClO2) = M(NaOH)V(NaOH)
M(HClO2)*41.6 mL = 0.146 M*14.85 mL
M(HClO2) = 0.146*14.85/41.6 M = 0.0521 M
when using a dichotomous key to identify organisms what do we look at
a. physical features
b. weather patterns
c. environment
d. diet
Answer: A. Physical features
Explanation:
A dichotomous key for identifying organisms primarily uses the physical features of the organisms. The user is required to accurately observe and describe these characteristics to correctly proceed in using the key.
Explanation:When using a dichotomous key to identify organisms, we primarily look at the physical features of the organisms. A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. The key presents a series of choices about the characteristics of the unknown organisms; these choices are based on the physical features. The user must accurately observe and describe the physical features in order to correctly proceed in using the key.
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A new island formed by volcanic action may eventually become populated with living organism as a result of?
After volcanic eruption the new land will be populated with a large number of organisms called pioneer species. The process is called Primary succession.
What is primary succession?The process in which a new land is created or exposed for the first time after volcanic eruption is defined as the primary succession. During this time the lava cools and produces new rocks.
After this first of all the lichens are found to attach themselves to rocks and the plant species which can grow without much soil can appear. Gradually the decomposition of all these plants helps in soil formation.
As a result more and more plants begin to colonize the area. So this land then becomes a fertile land with lot of nutrients and can lead to the formation of forest. Then after secondary succession occurs.
Thus in primary succession the newly formed land has been populated by many living organisms.
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An iron nail rusting is from a process called oxidation, this is an example of a
Answer:
Chemical change
Which of the following species cannot act as a Lewis base?
NH2-
NH4+
NH3
N3-
NH2-
Answer:
NH4+
Explanation:
A Lewis base is a substance with the ability to share or give pairs of electrons.
The NH4 + ammonium ion donates a proton, therefore the ammonium ion is a Lewis acid.
The species that cannot act as a Lewis base NH4+.
What is Lewis's base?
It refers to a substance like OH- ion where the pair should be donated of non-binding electrons. It should be treated as the electron-pair donor. Also, the one advantage is that it complements the reduction and oxidation of the reaction model. Moreover, it shows the capability for sharing or providing the pair of electrons. Also, NH4+ donated the portion so ammonium ion is a Lewis acid.
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In a compound, which type of bond is the sharing of electrons between adjacent atoms?
chemical bond
nuclear bond
hydrogen bond
electric bond bye the way can you help with more in the chat thing i need help
thanks to whoever answers
Answer:
Covalent bond
Explanation:
A microwave works by focusing microwave light on the food inside of it. Which type of energy transformation takes place in a microwave? A. Heat energy is transformed into light energy. B. Electrical energy is transformed into light energy. C. Heat energy is transformed into electrical energy. D. Light energy is transformed into electrical energy
Answer:
C is the answer
Explanation:
Heat energy is transformed into electrical energy.
Answer:
B. Electrical energy is transformed into light energy.
Given the equation representing a system at equilibrium in a sealed, rigid container:
2HI(g) <->H2(g) + I2(g) + energy
Increasing the temperature of the system causes the concentration of
1)HI to increase
2)H2 to increase
3) HI to Remain constant
4) HI to Remain constant
Answer: 1) HI to increase
Explanation:
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
[tex]2HI(g)\rightleftharpoons H_2(g)+I_2(g)+energy[/tex]
As the given reaction is exothermic , on increasing the tempearture, the equilibrium will shift in the direction where decrease in tempearture is taking place.So, the equilibrium will shift in the left direction. i.e. towards reactants. Thus amount of [tex]HI[/tex] will increase.
When the temperature of the system increased so it leads the concentration to option 1. HI to increase.
What is L-e-Ch-atelier's principle?It defines that if any change in the reaction variables so the equilibrium should be shifted in the direction so the impact should be minimized.
Since the given reaction is considered to be exothermic, so in the case when the temperature is increased so the equilibrium should be shifted in the direction that reduced the temperature.
Therefore, the equilibrium should be shifted in the left direction.
Hence the first option is correct.
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Vinegar, HCl, and H2SO4 are examples of
salt
acid
or base?
Answer:
Acid
Explanation:
Vinegar is a dilute form of acetic acid, while HCl is hydrochloric acid and H2SO4 is sulfuric acid. All of these are acids. Hope this helps!
Answer:
acids
Explanation:
Which observation indicates that the kinetic molecule theory has limited use for describing a certain gas
Answer:
Please Mark as Brainliest!!!!!!!!!!
Explanation:
Increasing pressure is causing a smaller change in gas volume. The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressured and temperature
Which type of muscle tissue aids in digestion
Answer: The muscularis (muscularis externa)
Explanation: please brainliest
the muscle that helps with digestion is a smooth muscle called the tract
At what temperature will 0.0705 mol of Cl2 exert a pressure of 900. torr at a volume of 0.750L? Round to 3 sig figs
Answer : The temperature [tex]Cl_2[/tex] gas is, 153 K
Explanation :
Using ideal gas equation:
[tex]PV=nRT[/tex]
where,
P = Pressure of [tex]Cl_2[/tex] gas = 900 torr = 1.18 atm (1 atm = 760 torr)
V = Volume of [tex]Cl_2[/tex] gas = 0.750 L
n = number of moles [tex]Cl_2[/tex] = 0.0705 mole
R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]
T = Temperature of [tex]Cl_2[/tex] gas = ?
Putting values in above equation, we get:
[tex]1.18atm\times 0.750L=0.0705mole\times (0.0821L.atm/mol.K)\times T[/tex]
[tex]T=152.9K\approx 153K[/tex]
Therefore, the temperature [tex]Cl_2[/tex] gas is, 153 K
How many grams are there in 4.50 moles of Ba(NO2)2?
To find the mass of 4.50 moles of Ba(NO2)2, you calculate its molar mass using atomic masses and multiply by the number of moles. The result is 1176.03 grams for 4.50 moles of Ba(NO2)2.
Explanation:To calculate the mass of 4.50 moles of Ba(NO2)2, you first need to find its molar mass by adding the atomic masses of barium (Ba), nitrogen (N), and oxygen (O) from the periodic table. The molar mass of Ba(NO2)2 is calculated as follows:
(1 mol Ba)(137.33 g/mol) + (2 mol N)(14.01 g/mol) + (4 mol O)(16.00 g/mol) = 261.34 g/mol
Then, you multiply the molar mass by the number of moles:
(4.50 moles) × (261.34 g/mol) = 1176.03 grams
Therefore, there are 1176.03 grams in 4.50 moles of Ba(NO2)2.
which of the following colors has the highest energy?
a. red
b. green
c. yellow
d. blue
Answer:
Blue
Explanation:
It is the closest color to violet.
The color which has the highest energy is the blue color because it have low wavelength value.
How do we calculate energy of wave?Energy of any waves of color will be calculated by using the below equation as:
E = hυ, where ............... (i)
h = plank's constant
υ = frequency of wave
Frequency is inversely proportional to wavelength (λ) as:
υ = c/λ, where ................. (ii)
c = speed of light
From (i) & (ii)
E = hc/λ
From this we conclude that wavelength is inversely proportional to energy and wavelength of blue color is smaller than other so that it will have higher energy.
Hence blue color has the highest energy.
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Why does a pan of warm water eventually become the same temperature as the room it is in
Final answer:
A pan of warm water will become the same temperature as the room because of heat transfer due to non-equilibrium. Heat will move from the warm pan to the cooler room air until they reach thermal equilibrium. This process is guided by the second law of thermodynamics and the principle of calorimetry.
Explanation:
A pan of warm water will eventually become the same temperature as the room it is in because the water and the pan will exchange heat with the room's air until thermal equilibrium is reached. Initially, the pan is at a higher temperature than the surrounding air. Over time, heat is transferred from the warmer object (the pan with water) to the cooler one (the surrounding air) until both reach the same temperature. This principle is based on the second law of thermodynamics, stating that the heat will always flow from a hotter object to a cooler one until the system reaches equilibrium.
When you pour 0.250 kg of 20.0°C water into a 0.500-kg aluminum pan with a temperature of 150°C and place it on an insulated pad, the pan and the water are initially not in thermal equilibrium. However, due to the rapid heat transfer, they will quickly exchange heat. The heat lost by the pan equals the heat gained by the water. The process continues until they are both at the same temperature, known as the thermal equilibrium.
A sample of hydrogen gas occupies 50.4 L at STP. This sample contains how many moles of hydrogen atoms
Answer: 4.5
Explanation:
Sustainability describes the actions humans can take to try and maintain some sort of balance with the Earth Air quality, water quality and availabilityreduced land erosion, replacing what is taken from the Earth (trees, crops, ) are just a few of the issues that sustainability deals withSelect one of the following scenarios that best describes an individual's actions that would help with sustainability.
A ) Reduced output in wind turbine blades would cut down on the carbon footprint of the factories that complete these tasks. This would help the Earth in the long run . Continually adding chemicals to sewage, after it is treated and before it is released back into the water supply, will help humans and the Earth into the foreseeable future . Adhering to scientifically backed guidelines on how to harvest and replant trees in a way that would not cause soil erosion or a loss in the biodiversity in that specific area would help the Earth in the long run D) Continued use of pesticides , herbicides , insecticides , and rodenticides will allow crops to grow and feed millions of people . The buildup of these chemicals in the environment is too small of a concern to try and change what is currently taking place
Answer:The answer is B
Explanation:
There is less water lost due to evaporation and therefore more available to plants. Mulch and minimum tillage results in twice as much available water as does deep tillage. This is an immediate benefit. We are looking for future benefits: less runoff and erosion, more soil stays in place, the soil is more fertile, and farmers use less fossil fuels.
Consider the chemical equation below.
Upper M g (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow upper M g (upper N upper O subscript 3) subscript 2 plus 2 upper H subscript 2 upper O.
Which is the net ionic equation?
The net ionic equation is:
[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]
To determine the net ionic equation, we first need to write the balanced chemical equation and then identify the spectator ions.
The given chemical equation is:
[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]
To balance the equation:
[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]
In the balanced equation, all species are dissolved in water, so we can split them into ions to identify spectator ions.
1. Mg(OH)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{OH}^- \)[/tex]
2. HNO₃ dissociates into [tex]\( \text{H}^+ \) and \( \text{NO}_3^- \)[/tex]
3. Mg(NO₃)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{NO}_3^- \)[/tex]
4. H₂O does not dissociate significantly.
So, the net ionic equation is:
[tex]\[ \text{Mg}^{2+} + 2\text{OH}^- + 2\text{H}^+ + 2\text{NO}_3^- \rightarrow \text{Mg}^{2+} + 2\text{NO}_3^- + 2\text{H}_2\text{O} \][/tex]
Cancelling out the spectator ions ([tex]\( \text{Mg}^{2+} \) and \( \text{NO}_3^- \)[/tex]), we get:
[tex]\[ 2\text{OH}^- + 2\text{H}^+ \rightarrow 2\text{H}_2\text{O} \][/tex]
Therefore, the net ionic equation is:
[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]
Which type of mixture is likely to separate if it is allowed to sit still?
A. Colloid
B. Solution
C. Alloy
D. Suspension
Answer:
D.
Explanation:
Suspension : for example sand and water. You can separate it when it sits still.
The type of mixture is likely to separate if it is allowed to sit still is suspension. Therefore, option D is correct.
What is suspension ?A heterogeneous mixture of a finely dispersed substance in a liquid is referred to as a suspension. Similar to how salt and water dissolve in one another, the solid is not dissolved in the liquid.
Examples of mixtures that are most frequently used are chalk and water, dirty water, flour and water, dust and air, fog, magnesium milk, etc.
Suspension parts can be divided into three categories: linkages, springs, and shock absorbers. The bars and brackets that support the wheels, springs, and shock absorbers are known as links. The car is padded by springs, which reduce shock loads caused by potholes and bumps in the road.
A fluid mixture that contains solid particles large enough for sedimentation is called a suspension.
Thus, option D is correct.
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What mass of aluminum at 144 Celsius will increase the temperature of 100 g of water by from 10 C to 15 C?
aluminum s = 0.900 water s = 4.184
Answer:
[tex]m_{Al} = 18.019\,g[/tex]
Explanation:
There is a heating process between an aluminium piece and water, which is described by the First Law of Thermodynamics:
[tex]Q_{Al} = - Q_{w}[/tex]
[tex]m_{Al}\cdot c_{Al}\cdot (T_{o,Al}-T) = m_{w}\cdot c_{w}\cdot (T-T_{o,w})[/tex]
The mass of the aluminium piece is therefore cleared and known variables are substituted:
[tex]m_{Al} = \frac{m_{w}\cdot c_{w}\cdot (T-T_{o,w})}{c_{Al}\cdot (T_{o,Al}-T)}[/tex]
[tex]m_{Al} = \frac{(100\,g)\cdot \left(4.184\,\frac{J}{g\cdot^{\circ}C} \right)\cdot (15^{\circ}C-10^{\circ}C)}{\left(0.900\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (144^{\circ}C-15^{\circ}C)}[/tex]
[tex]m_{Al} = 18.019\,g[/tex]
Based on the kinetic molecular theory, which of the following statements is correct about a sample of gas at a constant temperature and volume?
The net kinetic energy of its particles decreases due to collisions.
The net kinetic energy of its particles increases due to collisions.
It has a constant average kinetic energy.
Its average kinetic energy is always zero.
Answer:
C) It has a constant average kinetic energy
Explanation:
The average kinetic energy of the particles in a gas is directly proportional to the temperature of the gas, according to the equation.
k is the Boltzmann's constant
T is the absolute temperature of the gas
Therefore, temperature of a gas is a measure of the average kinetic energy of the particles.
In this problem, we are told that the gas is at constant temperature (and volume): therefore, according to the previous equation, this means that the average kinetic energy is also constant.
Answer:
C - It has a constant average kinetic energy
Explanation:
Got it right on the test
Which of the following statements about a base are TRUE?
1. Bases are used in the manufacturing of soap.
2. Bases have a sour taste.
3. Fertilizer manufacture and cotton processing use bases.
1 and 3 only
2and 3 only
All of 1, 2, and 3
1 and 2 only
Answer:
explanation:
1
100 points guys please help me
Answer:
I’m pretty sure its D. Sweating when you are hot
Blacksmiths use heavy use heavy clothes and gloves so that they do not get burned
by fire. The materials do not transfer heat quickly, and therefore we call these
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O conductors
semiconductors
insulators
O convectors
Answer:
insulators
Explanation:
Insulators are any substance which do not let any heat to pass through it. In other words we can say that insulators are bad conductors of heat.
Example of insulators are clothes, woods, plastic
Blacksmiths work with metals which are heated at very high temperature. If the body of blacksmiths comes in contacts of metal with high temperature, they may get severe burn. To avoid any accidents they use clothes and gloves so in case if by mistake they come in contact with high temperature, these clothes and gear do not let let pass through it and protect the body of blacksmith.
Since these clothes and gloves do not let heat flow through it they belong to the category of insulators.
An unknown mass of aluminum requires 6290 joules to raise
the temperature from 23.9°C to 80.0°C. What is the mass of the
aluminum?
Specific heat value of aluminium is 0.900 J/gK
Answer:
124.579 g
Explanation:
Amount of heat required to change the temperature of body is given by the equation given below
Q = m* c * ΔT ____________________equation A
where Q is the total heat energy required by the any object
c is the specific heat capacity of the body J/gK
ΔT is the difference of final temperature of the object and initial temperature of the object
______________________________________
Given Q = 6290 joules
c = 0.900 J/gK
To calculate the temperature in kelvin from Celsius
we can use the formula
K = C + 273
initial temperature = 23.9°C
initial temperature on kelvin scale = 23.9° + 273 = 296.9
Final temperature = 80°C
initial temperature on kelvin scale = 80° + 273 = 353
ΔT(temperature difference) = 353 - 296.9 = 56.1
___________________________________________
let the mass of of the aluminum be m g
substituting the value of Q , c, ΔT in equation A we have
Q = m* c * ΔT
=> 6290 = m * 0.900 * 56.1
=> m = 6290/(0.900 * 56.1 )
=> m = 6290/50.49
=> m = 124.579 g
The mass of the aluminum is 124.579 g
Taking into account the definition of calorimetry, the mass of the aluminum is 124.58 grams.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the heat energy that is supplied to a body or an object, causes its temperature to increase without affecting its molecular structure and therefore its phase. In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
The equation that allows calculating heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 6290 Jc= 0.9 [tex]\frac{J}{gK}[/tex]m=?ΔT= Tfinal - Tinitial= (80 - 23.9) C= 56.1 C= 56.1 K Being a temperature difference, the value is the same in ° C and in ° KReplacing:
6290 J= 0.9[tex]\frac{J}{gK}[/tex]× m× 56.1 K
Solving:
6290 J= 50.49 [tex]\frac{J}{g}[/tex]× m
6290 J÷ 50.49 [tex]\frac{J}{g}[/tex]= m
124.58 g= m
Finally, the mass of the aluminum is 124.58 grams.
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