How can you use mass and volume to find density of a substance ?

Answer:

78 moles of the solute

Explanation:

From the question;

We 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

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.

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

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.

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

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.

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.

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

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

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.

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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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

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.

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

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.

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

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.

Answer: The charge on one electron is –1.6 x 10–19 coulomb.

Hope this helps!

An electron has a negative charge.

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.

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:

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

It is an example of a binary compound.

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.

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.

Answer:

Baking a cake is a chemical change

Explanation:

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:

The questions listed above relate to Earth systems and their interactions, especially in relation to climate change and global warming.

The questions listed above relate to the study of Earth systems and their interactions:

Scientists researching climate change and global warming focus on these aspects to understand the impact on the water cycle and life on Earth.

Scientists consider various research questions about how global warming affects the water cycle, investigating the effects on evaporation, precipitation, ocean currents, and ecosystems.

When considering how global warming may impact the water cycle, and thus life on Earth, scientists are likely to focus on a wide range of research questions. These could include questions such as:

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.

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.

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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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

Answer:

chemical process

Explanation:

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