Answer:
Option D.
Explanation:
Some of the alpha particles Rutherford shot at the gold foil bounced back, some scattered; but the majority of them went right through. That meant there had to be some sort of positively charged subatomic particle in there that pulled them through, but it had to be at the center and couldn't take up a lot of room.
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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What is the molarity of a solution of HCI if 3 moles dissolved in 2.5 liters of water?
Answer:
1.2 mol/L
Explanation:
Molarity = mol solute/L solution
We can accept that
L solution = L water = 2.5 L.
Molarity = 3 mol/2.5 L = 1.2 mol/L
1.2 mol/L is the molarity of a solution of HCl if 3 moles dissolved in 2.5 liters of water.
MolarityMolarity (M) is defined as the number of moles of solute dissolved in 1 L of solution. Molarity is also known as Molar concentration. The S.I Unit of Molarity is molar (M) or mol/L.
How to find molarity of a solution ?Molarity (M) = [tex]\frac{\text{Mass of solute}}{\text{Volume in liters}}[/tex]
= [tex]\frac{3\ mol}{2.5\ L}[/tex]
= 1.2 mol/L
Thus, we can say that 1.2 mol/L is the molarity of a solution of HCl if 3 moles dissolved in 2.5 liters of water.
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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.
2012 Gynnin
Can you measure tenths of a gram with confidence using this balance?
yes
no
Yes
The accuracy to which we can measure a value using a given instrument is dependent on the instrument's least count. The least count of this instrument is 0.1 grams, or a tenth of a gram. Therefore, we may measure to the tenth of a gram with confidence. We cannot measure to the hundredth of a gram however.
Which of the following best describes biogeochemical cycles? A. They cycle elements through the biotic and abiotic components of an ecosystem. B. They cycle elements through the plants and trees of an ecosystem C. They cycle elements through the plants and soil of an ecosystem. D.all of the above
Answer:
A. They cycle elements through the biotic and abiotic components of an ecosystem.
Explanation:
Chemical elements such as nitrogen, carbon, phosphorus etc. moves between the living and non-living parts of an ecosystem in the biosphere. The cycle of these elements between these counterparts (abiotic and biotic) is referred to as the BIOGEOCHEMICAL CYCLE.
Firstly, the biotic components of an ecosystem refers to the living organisms such as plants, animals, microbes etc while the abiotic components are the non-living parts such as soil, water etc. Therefore, according to the description given in the options, option A describes what a BIOGEOCHEMICAL CYCLE best.
Plz help me it’s emergency
Increase temperature = particle move faster
increase Concentration =more crowded so more collisions
Explanation:
when temperature increase,the particle gain kinetic energy which make the particles move faster hence more collisions.
if concentration increase,there will be more frequent collisions between the particles due to crowded
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 much energy is required to raise the temperature of 2 kg of iron from
20°C to 23°C? (Refer to table of specific heat values.)
O A. 2.7 J
O B. 900 J
O c. 2700 j
O D. 1.35
Answer:
252000j
Explanation:
Heat lost= heat gained
4200×2×3=heat lost
Energy =25200j
Answer: 2700 j
Explanation:
Q (energy) = m (mass) * t (change in temp) * c (specific heat capacity)
Plug in the values...
Q = 2(3)(0.45) (specific heat capacity of iron)
Q = 2.7 Kj
convert kilo joules to joules and you get 2700 j
Hope this helps :)
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.
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
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
Yasmins teacher tells her that the solubility of salt is 360g/L at room temperature (25C) . How can yasmin make an unsaturated salt solution?
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:
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 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
If there is a disturbance to a chemical system at equilibrium, then the
ystem will
Explanation:
Basically
The concentration of reactants and the products becomes equal at equilibrium. The equilibrium position is changed if the concentration of the species in the mixture is changed.
the disturbance causes a change in Q; the reaction will shift to re-establish Q=K.hafnium: atomic number
atomic number 15
atomic number 45
osmium: atomic number
magnesium: atomic number
The question is incomplete. The complete question is as follows:
Use the periodic table to identify the name or atomic number for each element below. (Give the name, not the chemical symbol, for each element.)
hafnium: atomic number
atomic number 15
atomic number 45
osmium: atomic number
magnesium: atomic number
Answer:
hafnium: atomic number - 72
atomic number 15 - Phosphorus
atomic number 45 - Rhodium
osmium: atomic number - 76
magnesium: atomic number - 12
Explanation:
A Periodic table is a tabular representation of elements or atoms arranged on the basis of their atomic number and atomic mass.
So according to the periodic table:
Hafnium is metal and atomic number of hafnium is 72 that lies in group 4 (IVb) of the periodic table.Atomic number 15 in the periodic table represents Phosphorus with the symbol P.Atomic number 45 in the periodic table represents Rhodium with symbol Rh.Atomic number of osmium is 76 that lies in Group 8 (VIIIB) of the periodic table.Atomic number of magnesium is 12 that lies in group 2 (II) of the periodic table.Hence, the correct answer is:
hafnium: atomic number - 72
atomic number 15 - Phosphorus
atomic number 45 - Rhodium
osmium: atomic number - 76
magnesium: atomic number - 12
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!
The dust and gas found between stars is called quasars. t or f
Answer:
The statement is false.
Explanation:
Quasars are astronomical objects that are very luminous found in the centres of dome galaxies and powered by gas spiraling at high velocity into an extremely large black hole. However, Nebula/Nebulae is a giant cloud of dust, hydrogen, helium and other ionized gases found in space. It is sometimes called "star nurseries"
I hope this helps you :)
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]
What substance is the conjugate acid in the reaction: HNO3 + NH3 produces NH4+ + NO3-
Answer:
NH4+
Explanation:
HNO3 + NH3 = NH4+ + NO3-
HNO3 = H+
Conjugate means "to join together" when used in chemistry
Acids are solutions with a higher ratio of H+ ions to OH- ions.
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
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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HELP ASAP-what has an atomic number of 1
Answer:
google gotchu i promise
Answer:
hydrogen has the atomic number of 1
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:
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 :)
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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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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What defines an exothermic reaction?
O A. A reaction that needs heat added
O B. A reaction that possesses enthalpy
O c. A reaction that relies on collisions
O D. A reaction that produces heat
a reaction that produce heat
Answer:
A reaction that produces heat.
Explanation:
formula of an exothermic reaction
Reactants → Products + Energy
Mary is biking downhill. She notices that her shirt and hair begin to pull back
on her and blow in the "wind" that she is creating as she moves faster. This
"wind" is an example of which of the following forces that also acts on an
airplane?
O A. Wind-tunnel modeling
B. Sound waves
C. Drag
D. Gravity
Drag is a type of "wind" which is also an example of the forces which also acts on an airplane.
What is Drag?This is referred to a type of force which acts opposite to the relative motion in a fluid such as air or water.
This force acts on the airplane and the biker due to their interaction with air which is a fluid. This is therefore the reason why option C was chosen and the most appropriate choice.
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