Answer: A.True
Explanation:
all but one is a method of passve transport in cells
osmosis
sodium/potassium pump
facilitated transport
Answer:
The answer is Osmosis........
Answer:
osmosis
Explanation:
osmosis is a method of passive transport in cells. osmosis in passive transport cells is of water
Can anyone help need answer asap
Answer:
Rises, sinks
the correct answer is B
Answer:
rises, sinks
Explanation:
Hot magma rises because as the temperature increases, it expands and becomes less dense. As it reaches the top, it cools down and becomes more dense, which means it will sink. Therefore, hot magma rises and cool magma sinks in convection mantle mechanism.
Yasmins teacher tells her that the solubility of salt is 360g/L at room temperature (25C) . How can yasmin make an unsaturated salt solution?
1.46 g H2 is allowed to react with 10.5 g N2, producing 2.72 g NH3. What is the theoretical yield in grams for this reaction under the given conditions?
Express your answer to three significant figures and include the appropriate units.
Answer : The theoretical yield in grams for this reaction under the given conditions is, 8.28 grams.
Explanation : Given,
Mass of [tex]H_2[/tex] = 1.46 g
Mass of [tex]N_2[/tex] = 10.5 g
Molar mass of [tex]H_2[/tex] = 2 g/mol
Molar mass of [tex]N_2[/tex] = 28 g/mol
First we have to calculate the moles of [tex]H_2[/tex] and [tex]N_2[/tex].
[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]
[tex]\text{Moles of }H_2=\frac{1.46g}{2g/mol}=0.73mol[/tex]
and,
[tex]\text{Moles of }N_2=\frac{\text{Given mass }N_2}{\text{Molar mass }N_2}[/tex]
[tex]\text{Moles of }N_2=\frac{10.5g}{28g/mol}=0.375mol[/tex]
Now we have to calculate the limiting and excess reagent.
The balanced chemical equation is:
[tex]3H_2+N_2\rightarrow 2NH_3[/tex]
From the balanced reaction we conclude that
As, 3 mole of [tex]H_2[/tex] react with 1 mole of [tex]N_2[/tex]
So, 0.73 moles of [tex]H_2[/tex] react with [tex]\frac{0.73}{3}=0.243[/tex] moles of [tex]N_2[/tex]
From this we conclude that, [tex]N_2[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]H_2[/tex] is a limiting reagent and it limits the formation of product.
Now we have to calculate the moles of [tex]NH_3[/tex]
From the reaction, we conclude that
As, 3 mole of [tex]H_2[/tex] react to give 2 mole of [tex]NH_3[/tex]
So, 0.73 mole of [tex]H_2[/tex] react to give [tex]\frac{2}{3}\times 0.73=0.487[/tex] mole of [tex]NH_3[/tex]
Now we have to calculate the mass of [tex]NH_3[/tex]
[tex]\text{ Mass of }NH_3=\text{ Moles of }NH_3\times \text{ Molar mass of }NH_3[/tex]
Molar mass of [tex]NH_3[/tex] = 17 g/mole
[tex]\text{ Mass of }NH_3=(0.487moles)\times (17g/mole)=8.28g[/tex]
Therefore, the theoretical yield in grams for this reaction under the given conditions is, 8.28 grams.
How does a scientist answer a scientific question? A. By observing and measuring B. By asking others for their opinions C. By finding the answer in a book D. By guessing the right answer
Answer:
The answer is A
Explanation:
Because . . .
- A is correct because scientist make their statements by using their observations and tools to measure.
- B is incorrect people's opinions are not facts! Plus, opinions can be wrong.
- C is incorrect because that book can be outdated and not every answer is in a book.
- D is absolutely incorrect because guessing a "right" answer can be wrong. For example, if you were a scientist and you guessed a treatment for coronavirus, you will defiantly get fired because you don't have evidence or logic to back up your answer. In addition, if people used ur "treatment" the one you have guessed as the "right" answer, you can put people's lives in danger and they can possibly die. You will defiantly be responsible for it and be put into jail.
Answer:A
Explanation:
2
The ware function
of
the particle is normalized. why?
Answer:
The probability of finding the particle somewhere in the universe must be equal to 1.
Which tool is used to measure an object's mass
Answer:
A scale, or a weight. Both of which are more scientifically referred to as a balance.
The answer is a Balance
Why is water necessary for life
Answer:
Water is necessary for life because water carries nutrients to all of our cells. Water also carries oxygen to the brain and allows our body to absorb minerals and vitamins
Explanation:
hope this helps! good luck :)
Which of the following is NOT an example of a watershed?
Select one:
a. Santee River Basin
b. Edisto River Basin
c. Pee Dee Watershed
d. The Atlantic Ocean
Check
Which of the following Kb values represents the strongest base?
O A. Kb = 1.26 x 10-6
B. Kb = 3.8 x 10-10
O c. Kb = 1.26 x 10-7
OD. Kb = 1.8 x 10-5
Answer:
D. Kb = 1.8 × 10⁻⁵
Explanation:
The strongest base has the largest Kb value.
The largest Kb value has the smallest negative exponent.
So, the strongest base has Kb = 1.8 × 10⁻⁵.
The value of base dissociation constant (Kb) which represents the strongest base is 1.8×10⁻⁵.
What is strong base?Strong bases are those bases which completely dissociates into their ions and have high pH value in between 7 and 14.
pH value of any base is directly proportional to the value of base disssociation constant (Kb), means high value of Kb will indicates high value of pH i.e. hing basic strength. So, highest value of Kb is 1.8×10⁻⁵.
Hence 1.8×10⁻⁵ Kb value shows strong base.
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One of the primary benefits of a survey is that they
A. can generate cause-and-effect conclusions
B. allow efficient gathering of unobservable phenomena
C. allow for researchers to observe one's natural behavior
D. are able to provide a detailed look at a single subject
Answer:
B). Allow efficient gathering of unobservable phenomena.
Explanation:
Surveys are described as the method of gathering information from a specified group of respondents for purposes like research or assessment of the truth of thoughts or opinions associated with a process.
As per the question, one of the most considerable benefits of the survey is that 'it allows the efficient gathering of unobservable phenomena'. The data associated with phenomena like stated preferences, behaviors, beliefs, and factual information are unobservable and can not be collected through observation but surveys help in doing so as well as in the assessment of the validity or reliability of the existing propositions about such phenomena. Thus, option B is the correct answer.
Answer: b
Explanation:
Identify which element this particle is and write its symbol, including charge?
1) particles: x
neutrons: 4
Protons: 3
electrons:3
2) particles: Y
Neutrons:5
Protons:4
Electrons:4
3) particles: Z
Neutrons: 6
Protons: 6
Electrons: 6
4) particles: A
Neutrons: 6
Protons: 4
Electrons: 2
Answer:
Explanation:
1. lithium=Li
2.berilium=Be
3.carbon=C
4.Lithium= Li1+
The elements with their symbols and charge are:
1. Lithium, Li, charge is 1.
2. Beryllium, Be, charge is 2+
3. Carbon, C
4. Lithium, Li, charge is 1+
What are chemical elements?Chemical elements are the base of everything present on the Earth. These elements are present under the earth.
There are 118 elements traced and are present in either free or mixed form.
Thus, the correct options are 1. Lithium, Li, charge is 1.
2. Beryllium, Be, charge is 2+
3. Carbon, C
4. Lithium, Li, charge is 1+
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Determine the overall energy change for the reaction between hydrogen and oxygen shown in Question 13. Use Figure 2.
Answer:
–500KJ
Explanation:
Data obtained from the question include the following:
Heat of reactant (Hr) = 800KJ
Heat of product (Hp) = 300KJ
Enthalphy change (ΔH) =..?
The enthalphy change is simply defined as the difference between the heat of product and the heat of reactant i.e
Enthalphy change = Heat of product – Heat of reactant
ΔH = Hp – Hr
With the above formula, we can easily calculate the enthalphy change as follow
ΔH = Hp – Hr
ΔH = 300 – 800
ΔH = –500KJ.
Therefore, the overall energy change for the reaction between hydrogen and oxygen shown in the diagram above is –500KJ
Given:
N2 + 3H2 → 2NH3
In the chemical reaction, how many grams of nitrogen are needed to completely react with 24.3 grams of hydrogen? Use the periodic table to get the weights of the elements.
Drag each number to the correct location to complete the analysis.
Answer:
113.4g of N2
Explanation:
Step 1:
The balanced equation for the reaction.
N2 + 3H2 —> 2NH3
Step 2:
Determination of the mass of N2 and H2 that reacted from the balanced equation. This is illustrated below:
Molar mass of N2 = 2x14 = 28g/mol
Mass of N2 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 3 x 2 = 6g
From the balanced equation above, 28g of N2 reacted with 6g of H2.
Step 3:
Determination of the mass N2 required to react with 24.3g of H2.
The mass of N2 required to react with 24.3g of H2 can be obtained as follow:
From the balanced equation above, 28g of N2 reacted with 6g of H2.
Therefore, Xg of N2 will react 24.3g of H2 i.e
Xg of N2 = (28 x 24.3)/6
Xg of N2 = 113.4g
Therefore, 113.4g of N2 is required to react completely with 24.3g of H2.
24.3g H2 × 1 mol H2/2.016g H2 × 1 mol N2/3 mol H2 × 28.014 g N2/1 mol N2 = 113g N2
The picture shows a contractile vacuole of a unicellular freshwater organism. The contractile vacuole regulates the flow of water into and out of the cell in an aquatic environement. What condtions cause the contracile vacuole to fill with water? Your answer: A.The concentration of water is greater outside the cell than inside the cell. B.The concentration of water inside the cell is the same as the concentration outside the cell. C.The temperature of water in the vacuole is higher than the temperature of its environment.
Answer:
A.The concentration of water is greater outside the cell than inside the cell.
Explanation:
The contractile vacuole of certain organisms functions to regulate water flow in and out of the cell. It does this by storing excess water that comes into the cell. In the case of this organism with a filled up contractile vacuole, it means water is flowing into the cell.
Naturally, water will flow into a living cell when an osmotic gradient i.e. difference in concemtration, has been created between intracellular and extracellular solutions. Osmosis involves movement of substances from a region of high water concentration to a region of low water concentration. This means that if water is flowing into the cell, which is stored by the contractile vacuole, the concentration of water must be greater outside the cell than inside.
A-Its energy increased
B-it’s amplitude increases
C-it’s frequency decreases
D-it’s wavelength decreases
Which is evidence that a chemical reaction has occurred? A) a phase change occurs B) a new gas is observed in the form of bubbles C) red and yellow paint mixing to make orange paint D) the temperature of the substance remains constant
Answer:
I think A) a phase change occurs
Answer:
a new gas is observed in the form of bubbles
Explanation:
just did it!
WILL MARK BRAINLIEST AND 20 POINTS!!!!
Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with “basking lights” which act as an artificial sun. Describe how the three methods of thermal energy transfer may take place within the iguana’s enclosure.
Answer:
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. Conduction is the transfer of heat between substances that are in direct contact with each other. Thermal energy is transferred from hot places to cold places by convection. Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation.
The thermal energy transfer may take place within the iguana’s enclosure through Conduction, Convection, and Radiation.
What are Conduction, Convection, and Radiation?In conduction, heat transfer happens between objects by direct contact. If the heat transfer takes within the fluid then it is In convection. In radiation, heat transfers without involving particles through electromagnetic waves.
In conduction, Heat transfer occurs because of the difference in temperature. In convection, heat transfer occurs due to the difference in density. In radiation, heat transfer occurs with a temperature greater than 0 K in all objects.
In convection, heat transfer in conduction is slow while in convection, heat transfer, in convection is faster and in radiation, the heat transfer in radiation is the fastest.
Conduction and convection heat transfer does not follow the law of refraction and reflection. Radiation heat transfer follows the law of refraction and reflection.
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which of the following elements would you expect to behave most like magnesium?
a) sodium
b) calcium
c) aluminum
d) scandium
The element that would behave most likely magnesium is calcium. The correct option is b.
What is an element?An element is a material whose atoms all contain the same number of protons: that is, all atoms of each element have the same amount of protons.
Elements are the most basic chemical forms and thus cannot be broken down chemically.
A chemical element is something that cannot be broken down further through any chemical reaction. Every element's atom encompasses a distinct number of protons.
A pure element is defined in chemistry as a substance whose atoms all (or almost all) have the same atomic number, or number of protons.
Beryllium and Calcium exhibit chemical reactions similar to Magnesium.
Thus, the correct option is b.
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The reaction, C2H6) (l) + 3)2 (g) produces 2CO2 (g) + 3H2) (g), is the combustion of ethanol. What occurs as the reaction proceeds.
Answer:
So as the reaction proceeds we lose energy as the reaction is exothermic due to the delta H being negative, this shows that heat flows from the system to its surroundings.
Explanation:
2H6O (l) + 3O2 (g) = 2CO2 (g) + 3H2O (g)
2CH3CH2OH(l) + 3O2(g) = 2CO2(g) + 3H2O(g) ΔH = -1234.8kJ/mol
I'm pretty sure this is what your equation is supposed to be, seems to be an error where you've pasted it and it's replaced the O's with )
So as the reaction proceeds we lose energy as the reaction is exothermic due to the delta H being negative, this shows that heat flows from the system to its surroundings.
A 75.0 g sample of granite initially at 92.5oC is immersed into 60.0 g of water initially at 22.2oC. Determine the final temperature (in oC) when they reach thermal equilibrium. Assume no heat loss to the surroundings.
Specific heats: granite = 0.790 J/(goC), water = 4.184 J/goC
Answer:
[tex]\large \boxed{35.6 \,^{\circ}\text{C}}[/tex]
Explanation:
There are two heat transfers involved: the heat lost by the granite and the heat gained by the water.
According to the Law of Conservation of Energy, energy can neither be destroyed nor created, so the sum of these terms must be zero.
Let the granite be Component 1 and the water be Component 2.
Data:
For the granite:
[tex]m_{1} =\text{75.0 g; }T_{i} = 92.5 ^{\circ}\text{C; }\\C_{1} = 0.790 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$}[/tex]
For the water:
[tex]m_{2} =\text{60.0 g; }T_{i} = 22.2 ^{\circ}\text{C; }\\C_{2} = 4.184 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$}[/tex]
Calculations
(a) The relative temperature changes
[tex]\begin{array}{rcl}\text{Heat lost by granite + heat gained by water} & = & 0\\m_{1}C_{1}\Delta T_{1} + m_{2}C_{2}\Delta T_{2} & = & 0\\\text{75.0 g}\times 0.790 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$} \times\Delta T_{1} + \text{60.0 g} \times 4.184 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$}\Delta \times T_{2} & = & 0\\59.25\Delta T_{1} + 251.0\Delta T_{2} & = & 0\\\end{array}[/tex]
(b) Final temperature of water
[tex]\Delta T_{1} = T_{\text{f}} - 92.5 ^{\circ}\text{C}\\\Delta T_{2} = T_{\text{f}} - 22.2 ^{\circ}\text{C}[/tex]
[tex]\begin{array}{rcl}59.25(T_{\text{f}} - 92.5 \, ^{\circ}\text{C}) + 251.0(T_{\text{f}} - 22.2 \, ^{\circ}\text{C}) & = & 0\\59.25T_{\text{f}} - 5481 \, ^{\circ}\text{C} + 251.0T_{\text{f}} - 5572 \, ^{\circ}\text{C} & = & 0\\310.2T_{\text{f}} - 11052\, ^{\circ}\text{C} & = & 0\\310.2T_{\text{f}} & = & 11052 \, ^{\circ}\text{C}\\T_{\text{f}}& = & \mathbf{35.6 \, ^{\circ}}\textbf{C}\\\end{array}\\\text{The final temperature is $\large \boxed{\mathbf{35.6 \,^{\circ}}\textbf{C}}$}[/tex]
How does water's dissolving power support life on Earth?
For the acids, use the formula pH = -log[H+). (Because HCl has 1 H+ ion per formula unit, [H+] equals the
molarity.) For water, use what you know about the pH of neutral solutions. For the bases, examine and
extend the pattern. DONE
0.1 M
НСІ
0.001 M
НСІ
0.00001 M
НСІ
Distilled
Water
0.00001 M
NaOH
0.001 M
NaOH
0.1 M
NaOH
pH
pH:
pH:
pH: 7
pH:
pH:
pH:
Answer:
pH = 1
pH = 3
pH = 5
pH = 9
pH = 11
pH = 13
Explanation:
The pH is defined as log [H⁺]. HCl in solution produce H⁺. That means HCl concentration is equal to H⁺ concentration. Thus:
- 0.1M HCl. pH = -log 0.1 = 1
- 0.001M HCl. pH = -log 0.001 = 3
- 0.00001M HCl. pH = -log 0.00001 = 5
For a base that produce OH⁻ in solution you can define a pOH as pOH = -log [OH⁻] knowing (For water equilibrium) pH = 14 - pOH
Thus, for the NaOH solutions:
- 0.00001M NaOH: pOH = -log 0.00001M = 5. pH = 14 - 5 = 9
- 0.001M NaOH: pOH = -log 0.001M = 3. pH = 14 - 3 = 11
- 0.00001M NaOH: pOH = -log 0.1M = 1. pH = 14 - 1 = 13
Answer:
pH = 1
pH = 3
pH = 5
pH= 7
pH = 9
pH = 11
pH = 13
Explanation:
Just did the test :)
Which of the following BEST describes temperature? *
The total kinetic energy in a system
O The average kinetic energy of a system
O The amount of heat in a system
How hot or cold something is
Answer:
the average kinetic energy of a system
Explanation:
the more kinetic energy in something, the hotter it is, the less kinetic energy in something, the cooler it is. gases have the most kinetic energy. solids have the least, but everything has kinetic energy
The option which best describes temperature is: B. The average kinetic energy of a system.
Temperature is simply a measure of the degree of hotness or coldness of an object.
Basically, the temperature of an object is measured with a thermometer and its units are;
Celsius (°C).Kelvin (K).Fahrenheit (°F).Kinetic energy can be defined as an energy possessed by an object due to its motion from one point to another.
On a related note, temperature is the average amount of kinetic energy of motion in a system.
Hence, as the molecules move (motion) more quickly in a system, the temperature of the system increases due to the absorption of heat and an increase in the average kinetic energy of the system.
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