D
Make sure the results of the experiment are useful
Explanation:
In an experiment, certain variables (independent variables) are controlled to check how they affect other variables (dependent variables) and understand the relationship between them. Also, these experiments usually have a control experiment, of no change, to help compare results and increases their reliability.
How many grams of sodium sulfide are formed in 1.6 g of hydrogen sulfide is bubbled into a solution containing 2.13 g of sodium‘s hydroxide assuming that the sodium sulfite is made and 94% yield?
Answer:
Find the Molar mass of each, find the limiting reagent, if there is one, and then multiply by .94. This is the quick way.
Explanation:
Definition: For all real numbers a, b, and c: if a=b, then a + c = b + c. This is the ____ ____ of Equality.
Answer: Addition Property of Equality
Explanation:
The addition property of equality says that if we add same value or quantity on both sides of an equation, the values on both the sides remain equal. Consider an equality a = b. Addition property of equality is a + x = b + x. Add the same number to both the sides of an equation.
Find the mass of a 50.p ml quantity of liquid of liquid is 1.64 g/ml
Answer:
The mass of liquid comes out to be 82 g.
Explanation:
Given density of liquid = 1.64 g/mL
Given volume of liquid = 50 mL
The relation between density and volume is shown below
[tex]\textrm{ Density} = \frac{\textrm{Mass of liquid}}{\textrm{ Volume of liquid}}[/tex]
Mass of liquid = [tex]1.64 \textrm{ g/mL}\times 50 \textrm{ mL} = 82 \textrm{ g}[/tex]
Mass of 50 mL liquid = 82 g
To make a 6.50M solution, how many moles of solute will be needed if 12.0 liters of solution are required
Answer:
78 moles of the solute
Explanation:
From the question;
Molarity of the solution is 6.50 M Volume of the solution is 12.0 LWe want to determine the number of moles needed
We need to know that;
Molarity = Number of moles ÷ Volume
Therefore;
Number of moles = Molarity × Volume
Hence;
Number of moles = 6.50 M × 12.0 L
= 78 moles
Thus, the moles of the solute needed is 78 moles
1.00 mole of an ideal gas at STP is cooled to -41°C while the
pressure is increased to 805 mmHg. What is the new volume
of the gas in liters?
Answer:
V₂ = 18.13 L
Explanation:
Given data:
Mole of gas = 1 mol
Initial temperature = 273 K
Initial pressure = 1 atm
Final volume = ?
Final temperature = -41°C (-41+273 = 232 K)
Final pressure = 805 mmHg (805/760 = 1.05 atm)
Solution:
First of all we will calculate the initial volume of gas.
PV = nRT
V = nRT/P
V = 1 mol × 0.0821 mol.L/atm.K × 273 K / 1 atm
V = 22.4 L/atm / 1 atm
V = 22.4 L ( initial volume)
Now we will determine the final volume by using equation,
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Now we will put the values.
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1 atm × 22.4 L × 232 K / 273 K × 1.05 atm
V₂ = 5196.8 atm .L. K / 286.65 atm.K
V₂ = 18.13 L
Explain how thermal energy added to a sample of matter affects the motion of the particles?
Answer:
When heat is added to a substance the molecules and atoms vibrate faster. As atoms vibrate faster the space between atoms increases. The motion spacing of the particles determines the state of matter of the substance. The end result of increased molecule emotion is that the object expands and takes up more space.
Charge of an electron
Answer: The charge on one electron is –1.6 x 10–19 coulomb.
Hope this helps!
An electron has a negative charge.
The form of energy that is found in large moving objects is _________ ________ energy.
Answer: The first one would be "_______ mechanical energy" second one is "gravitational potential energy"
Sorry; I have no idea at all what word would be placed in front of mechanical the only word that comes to mind is Kinetic but I think it may be wrong
Final answer:
Kinetic energy is the form of energy found in large moving objects. It is the energy of motion, allowing objects to perform work when they are in motion, and is calculated based on the object's mass and velocity.
Explanation:
The form of energy that is found in large moving objects is kinetic energy. Kinetic energy is the energy of motion, allowing objects to perform work when they are in motion. A few everyday examples of kinetic energy include a speeding bullet, a person walking, and the molecules in the air that move rapidly to produce heat. Anything that moves has kinetic energy, and the amount of kinetic energy an object possesses depends on both its mass and its velocity, as expressed by the formula KE = 1/2mv², where m is mass and v is velocity.
While kinetic energy is associated with motion, potential energy is energy that is stored. For instance, a wrecking ball held at a height has potential energy due to its position but when it's moving, that potential energy is converted to kinetic energy, highlighting energy transformation between the two forms.
Need help with this chemistry stoichiometry worksheet any help is appreciated with work shown!
1) The mass of iron III oxide is 3.92 g and the mass of water is 1.32 g
2) The mass of the Mg is 19.44 g
3) The mass of calcium phosphate is 109 g
What is stoichiometry?
1) The equation is;
[tex]2Fe(OH)_3 - > Fe_2O_3 + 3H_2O[/tex]
Number of moles of iron III hydroxide
Moles = Mass/Molar mass
= 5.25 g/107 g/mol
= 0.049 moles
2 moles of iron III hydroxide produces 1 mole of iron III oxide
0.049 moles of iron III hydroxide produces 0.049 moles * 1 mole/2 moles
=0.0245 moles
Mass iron III oxide = 0.0245 moles * 160 g/mol
= 3.92 g
2 moles of of iron III hydroxide produces 3 moles of water
0.049 moles of iron III hydroxide produces 0.049 moles * 3 moles/ 2 moles
= 0.0735 moles
Mass of water = 0.0735 moles * 18 g/mol
= 1.32 g
2) Moles of magnesium fluoride = 50 g/62 g/mol
= 0.81 moles
[tex]Mg + F_2 -- > MgF_2[/tex]
1 mole of Mg produces 1 mole of magnesium fluoride
x moles of Mg produces 0.81 moles of magnesium fluoride
x = 1 * 0.81/1
= 0.81 moles of Mg
Mass of the Mg = 0.81 moles * 24 g/mol
= 19.44 g
3) [tex]3CaO + P_2O_5 --- > Ca_3(PO_4)_2[/tex]
Moles of calcium oxide = 100 g/56 g/mol
= 1.79 moles
Moles of phosphorus pentaoxide = 100 g/284 g/mol
= 0.35 moles
If 3 moles of calcium oxide reacts with 1 mole of phosphorus pentaoxide
1.79 moles of calcium oxide reacts with 1.79 * 1/3
= 0.596 moles
Thus phosphorus pentaoxide is the limiting reactant
1 mole of phosphorus pentaoxide produces 1 mole of calcium phosphate
0.35 moles of phosphorus pentaoxide produces 0.35 moles of calcium phosphate
Mass of calcium phosphate produced = 0.35 moles * 310 g/mol
= 109 g
Explain why groups 14 and 15 are better representatives of mixed groups than groups 13 and 16.
Answer:
Explanation:
Mixed groups are groups on the periodic table that contain more than one class (as in metals, non-metals or metalloids) of elements. Groups 13 to 16 form the mixed groups of the periodic table because they contain at least two different classes of elements.
However, groups 14 and 15 contain more classes (three classes) than groups 13 and 16 (two classes). Group-14 contains metals (examples include tin), non-metals (examples include carbon) and metalloids (examples include silicon) while group-15 also contains metals (such as bismuth), non-metals (such as nitrogen) and metalloids (such as arsenic). Whereas group 13 and 16 only contain two classes of elements; group-13 contains metalloid (boron) and metals (such as aluminium) while group-16 contains metalloids (such as tellurium) and non-metals (such as oxygen).
Final answer:
Groups 14 and 15 exemplify a broad range of chemical behaviors, including metal, nonmetal, and metalloid elements, making them more representative of mixed groups than Groups 13 and 16.
Explanation:
Groups 14 and 15 are better representatives of mixed groups than groups 13 and 16 because they include both metals and nonmetals, thus displaying a wider range of physical and chemical properties. Groups 14 and 15, which include the carbon group and the pnictogens, respectively, have elements that are essential to life and industry and exhibit diverse chemical behaviors. Lewis structures show that these groups can form neutral compounds with four and three bonded atoms, respectively, reflecting a trend where the number of bonds decreases across the period. In contrast, Group 13 elements are largely metals and Group 16 elements are largely nonmetals or metalloids, showing less diversity.
How many electrons can fit in the fourth energy level on an atom?
The fourth energy level of an atom can accommodate a maximum of 32 electrons, calculated with the formula 2n^2 for the fourth level (n=4), which results in 2 * 16 = 32.
Explanation:The fourth energy level of an atom can hold a maximum of 32 electrons. This is because the number of electrons that can fit in a given energy level is determined by the formula 2n2, where n is the principal quantum number corresponding to the energy level. For the fourth energy level (n=4), we calculate 2 * 42 = 2 * 16 = 32. Therefore, there are 32 positions for electrons in the fourth energy level, which means 32 electrons can be accommodated when this level is fully occupied.
It's important to note that energy levels are like concentric circles around the nucleus where electrons reside. The fourth energy level is the furthest out compared to the first three levels and therefore, electrons located here will have the most energy. Each orbital within these levels can hold a maximum of two electrons.
15. Sulfur hexafluoride is an example of a
It is an example of a binary compound.
A sample of gas has a volume of 3.75 L at a temperature of 25°C and a pressure of 1.15 atm. What will the volume be at a temperature of 35°C and a pressure of 620 torr?
Answer: V = 5.1 L
Explanation: To find the new volume, we will use the formula of Combined Gas Law and derive V2. We also need to convert first the temperature in Kelvin and convert torr to atm ( 1 atm = 760 torrs ).
Solution attached.
When matter and energy change forms within a closed system, A. the total amount of matter changes, but the total amount of energy does not. B. the total amount of energy changes, but the total amount of matter does not. C. the total amount of both matter and energy changes. D. the total amount of both matter and energy does not change.
Answer:
Option D. The total amount of both matter and energy does not change.
Explanation:
From Law of conservation of energy and Einstein's mass-energy relation, we know that, energy neither is formed not is destroyed. It converts from one form to another. Einstein's mass-energy relation: E = mc². It means, Matter is a form of energy i.e. matter holds energy equivalent to product of its mass and square of speed of light. Matter and energy can change forms but the total amount does not change in a closed system. Thus, correct option is D.
Answer:
D. energy cannot be created or destroyed, therefor, the total amount of matter and energy does not change.
Explanation:
study island
What is the advantage in using a simple machine?
Reduces the amount of work needed to move on object
Increase the mechanical advantage by increasing the effort force that is applied
Reduce the amount of energy required
Reduce the work needed to effort force applied rotion
The advantage in using a simple machine is to reduce the amount of work needed to move on object
Option A
Explanation:
A Simple machine is a device with less moving parts used to change motion and force to perform work. Some of the simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw which we all use in our daily life.
These simple machines make our work fast and accurate and also does not require much effort for the work to be done. In other words, we can tell simple machines make our work simpler. For eg: If we take the simple machine wheel and axle, in a bicycle, instead of moving the whole wheel, if we apply force on the pedals, the wheel starts moving. Thus, only less effort is required to move an object.
Answer:
The second one is the CORRECT answer.
Explanation:
Which sample of ocean water would be the most likely to have the highest salinity?
Ocean water taken from the surface of the ocean
The warmest sample of ocean water
The ocean water taken from an area near the polar ice caps
Ocean water taken from the bottom of the ocean
Answer:
Ocean water taken from the surface of the ocean
Explanation:
Attached is a plot of ocean salinity vs. depth. It shows the highest salinity ocean water is surface water. A world-wide map of ocean salinity shows the highest salinity to be in mid-latitude regions in the middle of the ocean. Water near the North Pole has lower salinity than that for lower latitudes.
Probably the main reason for higher salinity at the surface is the high evaporation rate of water there, leaving behind the salt.
During a 4 hour trip, a boat sailed 70 km in 2 h. Then the boat did not move for 1 hour and traveled 26 km in the last hour. What was the boat’s average speed ?
Answer:
32km/hr
Explanation:
The question asks to calculate the average speed for a boat.
Mathematically, the average speed is the total distance divided by the total time
Let’s get the total distance traveled:
That would be 70km + 26km = 96km
Now the total time taken would be 3 as the boat did not move at all for an hour.
The average speed is thus 96/3 = 32km/hr
Which sample of argon contains a total of 3.01 x 10^23 molecules at STP?
A)40.0g B)22.4L C)20.0g D)11.2L
Answer:option d
Explanation:
Final answer:
The correct answer is 22.4L. At Standard Temperature and Pressure (STP), 1 mole of gas occupies 22.4 liters, allowing for the calculation of the total number of molecules in a given sample volume.
Explanation:
The correct answer is B) 22.4L. At STP (standard temperature and pressure), 1 mole of gas occupies 22.4 liters. Given that the question asks for the total number of molecules and not mass, we should consider the volume to calculate the number of molecules of argon. So, to contain 3.01 x 10^23 molecules, the sample should have a volume of 22.4 liters.
Which is an ionic compound and which is a molecular compound? (picture #9)
Answer:OK. One of the properties of an ionic compound is that it conducts a current in aqueous (water) solution.
The ionic compound is held together by virtue of the opposing charges; plus and minus. In water, they may just crumble away into solution! But if you Heat a solid piece of a salt, an ionic compound, it takes a great deal of Energy! So look at Compound Y.
WOW! 455°C to melt. That is high. To boil it? 1550°C. That is very high! Especially compared to compound X!
It melts at -90°C, and boils at 82°C. So it is X that is your molecular compound, one of covalent bonding, or sharing electrons, VERY different than the ionic compound held together by opposing charges.
Explanation:
Ionic compounds consist of ions held together by electrostatic attraction, while molecular compounds are formed by the sharing of electrons between nonmetal atoms.
Explanation:An ionic compound consists of ions held together by electrostatic attraction, while a molecular compound consists of molecules held together by covalent bonds. Ionic compounds typically consist of a metal cation and a nonmetal anion, such as NaCl (sodium chloride). Molecular compounds, on the other hand, are formed by the sharing of electrons between two or more nonmetal atoms, such as H2O (water).
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which element has a crystalline lattice through which electrons flow freely
Final answer:
Metals have a crystalline lattice that allows free movement of delocalized electrons, making them conductive.
Explanation:
The element that has a crystalline lattice through which electrons flow freely is a metal. In a metallic crystal, metal cations are surrounded by a “sea” of mobile valence electrons, also known as delocalized electrons. These electrons can move through the entire crystal, conducting electricity effectively. This is because the metal ions (often visualized as positive ions due to their loss of valence electrons) are arranged in a lattice structure with enough space for the electrons to move. The free electrons are not tied to any single atom, which allows them to move freely among the atoms when an electrical field is applied. This property is what makes metals good conductors of electricity as opposed to ionic, covalent network, and molecular crystals, which have different electrical properties.
Which is an example of a chemical change?
ripping paper
chopping wood
baking a cake
stretching a rubber band
Answer:
Baking a cake is a chemical change
Explanation:
The method of changing one or more chemical compounds
Answer:
chemical process
Explanation:
Which of the following will result from increasing the temperature of a gas?
O
A. The number of gas molecules will increase.
O
B. The molecules will be forced into a smaller space together.
O
C. The molecules will slow down.
O
D. The volume of the gas will increase.
Answer:
The correct answer is D) The volume of the gas will increase.
Explanation:
According to Charles's Law, at constant pressure, as the temperature (T) of a gas increases, the volume (V) increases and vice versa. This is observed according to the formula:
V1 / T1 = V2 / T2
PLEASE ANSWERRRRRRRRR
Larry is looking through a lens at a grasshopper. He wants to get a better look at the grasshopper's back legs, but instead of looking larger the legs look smaller. What happened?
A. Larry must have grabbed a concave lens since the legs look smaller.
B. Larry must have grabbed a concave lens since the legs are upside down.
C. Larry must have grabbed a convex lens since the legs look smaller.
D. Larry must have grabbed a convex lens since the light rays are diverging (spreading out).
Answer: A. Larry must have grabbed a concave lens since the legs look smaller.
Explanation:
I'm not sure. I did some research and it seems that this is the correct one because, universe today.com said; "A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia)." and passmyexams.co.uk said; "Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. The distance between the principal focus and the centre of the lens is called the focal length." and so, this lead me to believe that the answer is; A. Larry must have grabbed a concave lens since the legs look smaller.
HELP ASAP PLEASE...According to the mantle plume theory, what causes hot spots?
A.Thin places in the seafloor crack.
b.An upwelling of magma from the mantle gathers close to the Earth’s surface.
C.Chimney-like hydrothermal vents form on the seafloor.
D.Oceanic plates are subducted and volcanoes form.
B. An upwelling of magma from the mantle gathers close to the Earth’s surface
Hot spots, according to the mantle plume theory, are triggered by an upwelling of magma from the mantle that builds up near the Earth's surface. The magma is the result of extreme interior heat melting mantle material, which ascends and pierces the crust to form a hotspot.
Explanation:According to the mantle plume theory, hot spots are caused by an upwelling of magma from the mantle that gathers near the Earth’s surface. This magma is generated by the intense heat in the Earth's interior (the core), which causes material in the mantle to melt. When this molten material rises upwards, it can punch a hole in the crust and form a hotspot. Thus, the correct answer to your question is B: an upwelling of magma from the mantle gathers close to the Earth’s surface.
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What is the molar mass for N5O9
Answer:
The molar mass of N5O9
is 214.0245g/mol
Explanation:
To solve this problem, we need to know each number of mole of each element present in the compound
N has 5 moles
O has 9 moles
Then, we multiple each number of mole by its number of mass of each element present
N - 14.0067
O - 15.999
Multiplying by mole
N - 5 * 14.0067 = 70.0335
O - 9 * 15.999 = 143.991
Therefore,
Molar mass of N5O9 = 70.0335 + 143.991
= 214.0245g/mol
What is the best way to describe how mutations relate to the concept of survival of the fittest? Choose the best answer from the choices below.
A. Only those mutations that are helpful will be passed-on.
B. A mutation that allows organisms to survive is more likely to be passed on.
C. Only those mutations that are harmful will be passed-on.
D. Mutations do not relate to survival of the fittest.
Answer:
B
Explanation:
Mutations that increase an organism's ability to survive and reproduce in its environment are more likely to be passed on to future generations. This core principle is known as survival of the fittest.
Explanation:The concept of survival of the fittest is closely related to the idea of mutations. Mutations are changes in an organism's DNA that can lead to new traits. The best way to describe how mutations relate to survival of the fittest is to say that a mutation that allows an organism to survive and reproduce more successfully in its environment is more likely to be passed on to future generations.
Thus, option B is the correct answer: 'A mutation that allows organisms to survive is more likely to be passed on'. Not all mutations are beneficial, some can be harmful or neutral, but only those mutations that increase an organism's fitness — its ability to survive and reproduce — are likely to be passed on.
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What does L represent? When did it form?
Answer:
All I can say is that it seems to go through the other layers. I would say this is an intrusive rock and probably the youngest
Explanation:
I suggest d i k e s. Put it together. somehow I cant post it when put together
Answer:
Layer L represents a fault line. It formed after layer E and all the layers beneath it. There is no displacement in layer G or layer A. Therefore, the fault line formed before these two layers.
Explanation:
this is the actual answer
What is Keg for the reaction N2 + 3H2 = 2NH2 if the equilibrium
concentrations are [NH3] = 2 M [N2] = 3 M, and [H2] = 1 M?
O A. Keq = 0.67
O B. Keq = 0.75
O C. Keq = 1.33
O D. Keq = 1.5
Answer: The equilibrium constant for the given reaction is 1.33
Explanation:
We are given:
Equilibrium concentration of ammonia = 2 M
Equilibrium concentration of nitrogen gas = 3 M
Equilibrium concentration of hydrogen gas = 1 M
For the given chemical equation:
[tex]N_2+3H_2\rightleftharpoons 2NH_3[/tex]
The expression of [tex]K_{eq}[/tex] for above equation follows:
[tex]K_{eq}=\frac{[NH_3]^2}{[N_2][H_3]^3}[/tex]
Putting values in above equation, we get:
[tex]K_{eq}=\frac{(2)^2}{3\times (1)^3}\\\\K_{eq}=1.33[/tex]
Hence, the equilibrium constant for the given reaction is 1.33
3.2 moles of H3PO4 to grams
Answer:
313, 6grams of H3PO4
Explanation:
We calculate the weight of 1 mol of H3PO4:
Weight 1 mol H3PO4= (Weight H)x3+ (Weight P)+(Weight 0)x4 =1gx3+31g+16gx4
Weight 1 mol H3PO4=98 g /mol
1 mol-----98 grams H3PO4
3,2mol----x= (3,2molx 98 grams H3PO4)/ 1mol=313,6 grams H3PO4