the answer would be B an atom that has lost an electron
how many neutrons does the isotope lithium have
A.) 3
B.) 5
C.) 8
D.) 4
PLEASE HELP
which anode-carhoden combination would NOT produce a voltaic cell with high voltage?
Ca Ni
AI Cu
Au H
Li Fe
Answer:
The correct answer is Au, H
(Took the exam)
Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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How does engineering affect the amount of human labor needed to harvest rice?
Answer:
Yes
Explanation:
The first step of harvesting is draining the paddy. Next, farmers cut the plants -- with a scythe or sickle if by hand -- and transport them elsewhere to be laid out and dried for two or three days. Rice can be cut by hand or machine. In the developed world, harvesting by hand is still very common.
Please help!! Needed by today!!
Answer:
heres your answer 50gms
how much liquid is needed to prepare 629.5ml of a solution that has a new concentration of 14.3m if the stock solution is 25.2m?
Answer:
Right if you think it is.
16) a 110,52 g sample of mineral water is analyzed for its magnesium content. the mg2+ in the sample if first precipitated as mgnh4po4 and the precipitate is then converted to mg2p2o7 which is found to weigh 0,0549 g. express the quantity of magnesium in the sample in ppm (g of mg per million grams of h2o)
The amount of the magnesium in the sample in ppm is 497 ppm.
What is parts per million?The term parts per million refers to one of the manners in which concentration is expressed. It is common in oceanography and analytical chemistry.
Given that;
Mass of Mg= 0.0549 g
Mass of the sample = 110.52 g
Amount in PPM = 0.0549 g/110.52 g * 10^6
= 497 ppm
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4. How can extinct species be saved?
O by helping their numbers increase beyond "critical mass"
by increasing their population numbers
Oby encouraging mating in zoos
They cannot. Extinction is forever.
Extinct species be saved by increasing their population numbers and is denoted as option B.
What is Population?
This is defined as the total number of organisms in a particular area at a given period of time.
Extinct species can be saved by increasing their population through conservation and public awareness.
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What happens to the particles in hot water when it cools down
Answer:
its particles slow down and come closer together.
what is the specific heat capacity of propan-1-ol
Answer:
14
Explanation:
sun normal persentage is 14
A container contains three gasses, N2, O2 and Ar, with partial pressures of 23.3 kPa, 40.9 kPa and 13.7 kPa respectively. What is the total pressure inside the container
Convert molecules of vitamin d (molar mass 384.7 g/mol) to grams of vitamin d.
The 6.023 * 10²³ molecule means 384.7 grams of Vitamin D.
What is a mole ?A mole is a universal unit used to measure large number of atoms , molecules of an element.
one mole is equal to the Avogadro's Constant.
Mole is equal to the ratio of the mass of a compound to its molecular weight
It is given that Vitamin D is present
no. of molecule = 6.023 * 10²³
6.023 * 10²³ molecule constitutes of 1 mol
1 mole is equal to the molar mass of a compound/ element
Therefore 1 mole = 384.7grams of Vitamin D
and hence 6.023 * 10²³ molecule means 384.7 grams of Vitamin D.
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Which volume of ethane gas, in cm3 , will produce 40cm3 of carbon dioxide gas when mixed with 140cm3 of oxygen gas, assuming the reaction goes to completion
The volume of ethane gas, C₂H₆ in cm³ that will react to produce 40 cm³ of CO₂ is 20 cm³
Balanced equation2C₂H₆ + 7O₂ —> 4CO₂ + 6H₂O
From the balanced equation above,
4 cm³ of CO₂ were obtained from 2 cm³ of C₂H₆
How to determine the volume of C₂H₆ neededFrom the balanced equation above,
4 cm³ of CO₂ were obtained from 2 cm³ of C₂H₆
Therefore,
40 cm³ of CO₂ will be obtain from = (40 × 2) / 4 = 20 cm³ of C₂H₆
Thus, 20 cm³ of C₂H₆ are required for the reaction.
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If the pressure starts at 36 Kia what is the final pressure
answer:
is Well-Known Member. For a 35" you should be in the 28-32 range on road.
Explanation:
your welcome make brainlist
solve for x
[tex] \bold{x^{2} + 6x + 5 = 0}[/tex]
ty! ~
Answer:
x²+6x+5=0
On comparing with the equation
ax² + bx + c = 0
a=1, b = 6 and c = 5
Now
b²– 4ac = 6² – 4 x 1 x 5 = 36 - 20 = 16
[tex]x = \frac{ - b \:± \: \sqrt{b {}^{2} - 4ac } }{2a} \\ \\ x = \frac{ - 6\:± \: \sqrt{16 } }{2 \times 1} \\ \\ x = \frac{ - 6± {4} }{2} \\ \\ x = \frac{ - 6 + {4} }{2} \: \: or \: \: x = \frac{ - 6 - {4} }{2} \\ \\ \implies \: x = \frac{ \cancel-2 }{ \cancel2}^{-1 }\: \: or \: \: x = \frac{ \cancel-10 }{ \cancel2}^{-5}\\ \\ \implies \: { \blue{\fbox{ \: x = - 1 \: \: \: or \: \: \:x = - 5}}}[/tex]
[tex] {x}^{2} + 6x + 5 = 0 \\ \\ {x}^{2} + 5x + x + 5 = 0 \\ \\ x(x + 5) + 1(x + 5) = 0 \\ \\ (x + 1)(x + 5) = 0.[/tex]
[tex]x = - 1 \\ x = - 5.[/tex]
Besides water, which of the following compounds are found most in sea water?
sodium bromide
sodium chloride
hydrogen chloride
magnesium chloride
In the photo
Pls pls pls pls pls pls pls pls pls pls
The correct answers are Potential and Kinetic energy.
What are potential energy and examples?An object can store energy as a result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as a result of its position.
What is kinetic energy?Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
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Identify each described physical separation technique. a liquid is carefully poured out, leaving the solid behind in the container. choose... a solid is caught on paper or a membrane while the liquid passes through. choose... a solid mixture is heated. one component transitions directly between solid and gas. choose... a solvent is added to dissolve only one mixture component and then the liquids are separated.
Decanting, filtration, sublimation and distillation are the separation techniques.
Identify the physical separation technique?Decanting is a process in which a liquid is carefully poured out, leaving the solid behind in the container.
A solid is caught on paper or a membrane while the liquid passes through, this process is called Filtration.
Sublimation is a process in which a solid mixture is heated in which one component transitions directly between solid and gas.
A solvent is added to dissolve only one mixture component and then the liquids are separated, this process is known as distillation.
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The physical separation techniques used are :
Decanting FiltrationsublimationdistillationWhat are physical separation techniques ?
Physical Separation techniques are procedures applied for the separation of a mixture of two different states pf matter based on their physical properties. usually solid and liquid mixtures. When a mixture of liquid and solid is separated by carefully pouring out the liquid while leaving the solid behind that separation technique is known as decanting.
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Use the IUPAC rules to name the following structures.
The IUPAC nomenclature system is a set of logical rules devised and used by organic chemists to circumvent problems caused by arbitrary nomenclature.
The 1-ethyl-3-propylcyclopentane molecule contains a total of 30 bond(s) There are 10 non-H bond(s), 3 rotatable bond(s) and 1 five-membered ring(s).
The 1,2-dimethylcyclopentene molecule contains two methyl groups and one double bond in the ring.
The 1,3,5-Triethylbenzene molecule contains three ethyl groups and a benzene ring.
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The chart above shows the relationship between the first ionization energy and the increase in atomic number. The letter on the chart for the alkali family of elements is
A. W
B. X
C. Z
D. Y
help help help help help help
The exercise requires you to complete the sentences using the drop down. The complete sentences are given below.
Which step in the design process is represented by each of the following?The topic that was chosen because many students experienced cracked cell phone screens is: Protecting Cell Phones;Discussing ideas for possible cell phone cases: Phones that are durable;Writing down their list of requirements needed to make the phone case: Colorful and funky.Learn more about completing sentences at:
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The graph below shows how the temperature and volume of a gas vary when
the number of moles and the pressure of the gas are held constant. How can
the volume of the gas in a sealed container be decreased if the pressure is
constant?
T
A. By letting the gas diffuse over time
B. By lowering the temperature
C. By raising the temperature
D. By letting the gas effuse over time
The volume of the gas in a sealed container would be decreased at constant pressure: C. by raising the temperature.
What is Charles law?Charles law states that when the pressure of an ideal gas is kept constant, the volume of a gas is directly proportional to the absolute temperature of the gas.
This ultimately implies that, the volume of a gas decreases at constant pressure when its temperature is decreased and vice-versa.
In conclusion, we can infer and logically deduce that the volume of the gas in a sealed container would be decreased at constant pressure by raising the temperature in accordance with Charles law.
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What volume of nitrogen reacts with 33.6 litres of oxygen to produce nitrogen dioxide?
1 mol of every gas weighs 22.4L at STP
So
Moles of oxygen
33.6/22.4=1.5mol1 mol Nitrogen required for 2 mol O_2
0.5 mol N_2 required for 1 mol O_2
Moles of Nitrogen
0.5(1.5)0.75molVolume
22.4(0.75)16.8LConsider the reaction is taking place at standard temperature and pressure. Then 22.4 L reacts with 44.8 L of oxygen. Thus, 33.6 L of oxygen needs 16.8 L of nitrogen.
What is STP condition?The condition of STP is the standard temperature and pressure. The temperature of 298 K and pressure of 1 atm is called the standard condition.
At STP the volume of every substance is 22.4 L. The reaction of nitrogen and oxygen forming nitrogen dioxide is given below:
[tex]\rm N_{2} + 2O _{2} \rightarrow 2 NO_{2}[/tex]
As per this reaction, 22.4 L of nitrogen reacts with (2 × 22.4) = 44.8 L of oxygen. Hence, the volume of nitrogen required by 33.6 L of oxygen is calculated as follows:
(33.6 L × 22.4 L) / 44.8 L = 16.8 L
Therefore, the volume of nitrogen required to react with 33.6 L of oxygen is 16.8 L.
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help me pls thank u oh and worth a brainly
The next step in the engineering design process is to identify the criteria and constraints of the process.
What is engineering design?The process of engineering design has to do with the fabrication of new materials or the reworking of existing materials to fit into certain pre-specified objectives.
In this case, the next step in the engineering design process is to identify the criteria and constraints of the process.
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A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?
The number of molecules of oxygen in the cylinder is 6.02×1023 molecules
Data obtained from the question
Number of mole of oxygen = 1 mole
Number of molecule of oxygen =?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×1023 molecules. This implies that 1 mole of oxygen contains 6.02×1023 molecules.
Since the cylinder contains 1 mole of oxygen, then the number of molecules of oxygen present in the cylinder is 6.02×1023 molecules.
Express this number in scientific notation.
31,000,000,000
Answer:
3.1 x 10^10
Explanation:
there are 9 zeroes, so the quick way is too just add a one to the 9 and you get 10, so that is your power.
Hydrogen and iodine gas react to form hydrogen iodide, as shown in the equation H2(g) + I2(g) → 2HI(g). Suppose you are given a time interval from t1 = 10 seconds to t2 = 20 seconds and a change in H2 concentration from0.210 mol/L to 0.185 mol/L. Use the reaction rate equation to calculate the average reaction rate during that time period. Show your work.
The average reaction rate during that time period is 0.0025 mol/l.
What is concentration?The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
Given data:
[tex]t_1[/tex] = 10 seconds
[tex]t_2[/tex] = 20 seconds
[tex]C_1[/tex] = 0.210 mol/L
[tex]C_2[/tex] = 0.185 mol/L
∆C = |[tex]C_2[/tex]–[tex]C_1[/tex]| = |0.185-0.21| = 0.025 mol/l
∆t = [tex]t_2[/tex]– [tex]t_1[/tex] = 20 - 10 = 10 sec
∆C — is the concentration change
∆t — is the time change
V — reaction rate
V= [tex]\frac{\Delta C}{\Delta t}[/tex] = [tex]\frac {0.025}{10}[/tex]= 0.0025 mol/l•sec
Hence, 0.0025 mol/l is the average reaction rate during that time period.
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What is the molarity of a solution that is composed of 2.00 moles of potassium iodide dissolved in 4 l of water
Answer:
0.5 M
Explanation:
molarity = (moles of solute)/(liters of solution)
molarity = 2.00/4 = 0.5 M
what is the molarity of a nitric acid solution HNO3 if 20 ml of the solution is needed to exactly neutralize 10 ml of a 1.67 M NaOH solution?
Answer: 0.84 M
[tex]M_{A}V_{A}=M_{B}V_{B}\\(20)M_{B}=10(1.67)\\M_{B}=\frac{10(1.67)}{20} \approx \boxed{0.84 \text{ M}}[/tex]
If the empirical formula for a compound is NO2 and the molecular mass is 230.05 g/mol, what is the molecular formula for the compound? fast
Answer: [tex]\text{N}_{5}\text{O}_{10}[/tex]
Explanation:
The atomic mass of nitrogen is 14.0067 g/mol.The atomic mass of oxygen is 15.9994 g/mol.This means the molecular mass of nitrogen dioxide is [tex]14.0067+2(15.9994)=46.0055[/tex] g/mol.
Dividing this molecular mass of the compound we need to find, we get that
[tex]\frac{230.05}{46.0055} \approx 5[/tex].
So, the final answer is [tex]\boxed{\text{N}_{5}\text{O}_{10}}[/tex]