A bucket gets filled faster at ground floor than at 2nd floor​

Answer:

Explanation:

1)

Given data:

Mass of Al₂O₃ = 18.3 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 18.3 g/ 101.96 g/mol

Number of moles =0.18 mol

2)

Given data:

Mass of CaO needed = 35 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 35 g/ 56 g/mol

Number of moles =0.625 mol

3)

Given data:

Mass of H₂SO₄  needed = 126 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 126 g/ 98.1 g/mol

Number of moles = 1.28 mol

4)

Given data:

Mass of vinegar = 100 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 100 g/ 60.1 g/mol

Number of moles = 1.66 mol

Answer:

17.94 g

Explanation:

Ones day my include eating, resting, exercising. Unfortunately mine included not eating, not sleeping, and not exercising. I lay wife awake on my bed wishing for deaths door to find me sooner than later. I do my chores because if I don’t then my parents may take away the few things I love most. In conclusion, my daily activities include thoughts of “ why am I still alive” and actions of crying, punching ext.

Answer:

2.7g/cm³

Aluminum

Explanation:

Given parameters:

Mass of the cube  = 72.9g

Unknown:

Density of the cube = ?

Solution:

To solve this problem, we need to find the density of the cube. The mass is given and the dimensions of the solid figure.

Now;

       Density is the mass per unit volume of a substance

     Density  = [tex]\frac{mass}{volume}[/tex]  

Volume of the cube  = L³  = 3³   = 27cm³

So;

     Density  = [tex]\frac{72.9}{27}[/tex]   = 2.7g/cm³

The body is aluminum because it has a density of  2.7g/cm³

Answer:

3.39 * 10^-41 m

Explanation:

Given that:

speed of airplane = 880 km/hr

Mass of airplane = 80000 kg

Debroglie wavelength (λ) = h / mv

h = planck's constant = 6.626 * 10^-34

; mass = 80000kg

Velocity = 880km/hr to convert to m/s

Velocity = (880 * 1000m) / 3600 =244.44 m / s

λ = (6.626 * 10^-34) /(80000*244.44)

λ = (6.626 * 10^-34) / 19555200

λ = 3.3889 *10^-41

λ = 3.39 * 10^-41 m

Answer:

The temperature is on the y-axis and the time is on the x-axis.

Explanation:

Which statement describes how phase changes can be diagrammed as a substance is heated? (D is the answer)

The phase is on the y-axis and the temperature is on the x-axis.

The temperature is on the y-axis and the phase is on the x-axis.

The time is on the y-axis and the temperature is on the x-axis.

The temperature is on the y-axis and the time is on the x-axis.

Which statement describes the appearance of a temperature-vs.-time graph? (C is the answer)

A horizontal line shows that the temperature increases at a constant rate over time.

A vertical line shows that the temperature decreases at a constant rate over time.

Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases.

Horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

Answer:

it let them know what lived before them besides their old, dead grandpas

Explanation:

aaaaaaaa

Answer:

It let us know what came before us, what the past was like, and gave them a little idea of what happened.

Explanation:

Answer:

The correct movement would be -

1. Water  - into solution A.

2. NaCl  - into solution A.

3. glucose  - into Solution B.

4. Albumin  - neither.

Explanation:

All the substances are separated by the semipermeable membrane and the semipermeable membrane allows the only small molecule to pass through it. So the movement of the given substance would be -

1. Water  - into solution A.

Water molecules are small and can easily pass through the semipermeable membrane as it is given that the solution b has low solute concentration and solution A has high solute concentration. It is known that the movement of the solvent always takes place from low solute concentration to high so the movement of water will be into solution A.

2. NaCl  - into solution A.

The movement of small ionic molecule NaCl is always from high to low concentration as it is given that solution B has high concentration than solution A so movement will take place into solution A.

3. glucose  - into Solution B.

It is also a small molecule and moves from the high glucose region to the low glucose concentration region, in solution A the concentration of glucose is high than solution B so movement would be into solution B.

4. Albumin  - neither.

Albumin is a protein which is macromolecule and large in size to pass through the semipermeable membrane so, albumin move neither solution A nor solution B.

Answer:

because plants have energy in them from the sun and

Answer:

Animals get energy from food through the digestion process :)

Answer:

I think vaccum

Explanation:

Answer:

It represents how light can go through something.

Explanation:

Answer:

C

Explanation:

The mass of insoluble lead iodide produced from 0.830 g of potassium iodide in a reaction with lead nitrate is 2.31 g. Thus option C is correct.

Lead iodide or PbI is an ionic compound formed from the ionic bonding between metal lead and iodine. It is industrially prepared from the reaction of aqueous lead nitrate with potassium iodide.

Potassium iodide easily reacts with lead iodide as per the reaction written below:

[tex]\rm KI + PbNO_{3} \rightarrow KNO_{3} + PbI[/tex]

As per this reaction one mole of potassium iodide produce one mole of lead iodide. The molar mass of potassium iodide is 166 g/mol and that of lead iodide is 461 g/mol.

Thus, 166 g of potassium iodide gives 461 g of lead iodide. The mass of lead iodide then produced from 0.830 g of potassium iodide is calculated as follows:

mass = (0.830 g × 461)/ 166

         = 2.31 g.

Hence, the mass of insoluble lead iodide produced from 0.830 g of potassium iodide in a reaction with lead nitrate is 2.31 g and option C is correct.

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The mass of 16.6 × 10²³ molecules of barium nitrate is 718.7g

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There are 674 mg of calcium carbonate in a Rolaids tablet

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ +H₂O

V HCl = 24.65 ml

M HCl = 0.547

mol HCl :

[tex]\tt 24.65\times 0.547=13.48~mlmol[/tex]

ratio mol CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :

[tex]\tt \dfrac{1}{2}\times 13.48=6.74~mlmol=6.74\times 10^{-3}~mol[/tex]

mass of CaCO₃ (MW=100~g/mol) :

[tex]\tt 6.74\times 10^{-3}\times 100=0.674~g=674~mg[/tex]

Answer:

Cell

Explanation:

I just passed this unit a month ago.

Answer:

It is 6. Cell

Explanation:

Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.

I really hope this helped. God bless you and have a great day! :-)

Answer:

Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides.

Explanation:

Metalloids are sometimes known as semimetals. Metalloids are yellow elements on the periodic table that often lie along the stair-step line.

Metals are at the bottom left of the periodic table, and non-metals are at the top right.

Semimetals are found at the diagonal dividing line between metals and non-metals.

If there is barely any overlap between the top and bottom of the valence band, a substance is classified as a semimetal.

According to the electronic band theory, solids can be classified as metals, semimetals, insulators, or semiconductors.

An element that resembles metal in some ways but is not a metal For instance, although arsenic is a metalloid and appears to be a metal, it really conducts electricity poorly.

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Answer:

fou maybe

Explanation:

it was my answer hehe

Answer:2

Explanation:

Because it is

Answer:

Seeds need oxygen so that they can produce energy for germination and growth. The embryo gets energy by breaking down its food stores. Like all organisms, this is done through a process known as aerobic respiration. —a series of reactions where energy is released from glucose, using oxygen.

Answer:

d combustion because iron and oxegen need eachother

Answer:

The Correct answer would be Oxidation.

Explanation:

ANSWER: Things like salt, sugar and coffee dissolve in water. They are soluble. They usually dissolve faster and better in warm or hot water.

Answer:

its DDDDDDDDDDDDDDDDDD

The structure that is least likely to exist is HS.

Sulfur is an element in group 16. Sulfur is a divalent element that has two lone pairs of electrons. This means that sulfur forms compounds in which it is bonded to two atoms or groups.

All the molecules listed can exist because they consists of structures in which sulfur is bonded to two atoms or groups. The only structure that can not exist is HS because it does not satisfy the valency of sulfur.

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Answer:

[tex]C_{zinc}=0.400\frac{J}{g\°C}[/tex]

Explanation:

Hello!

In this case, by considering thermodynamics and the temperature of zinc, we can infer it is hot while water is cold, it means that the heat lost by the zinc is gained by the water and we can write:

[tex]Q_{Zn}=-Q_{water}[/tex]

In terms of mass, specific heat and temperatures we can write:

[tex]m_{Zn}C_{Zn}(T_{eq}-T_{Zn})=-m_{water}C_{water}(T_{eq}-T_{water})[/tex]

In such a way, by solving for the specific heat capacity of the zinc we write:

[tex]C_{zinc}=\frac{-m_{water}C_{water}(T_{eq}-T_{water})}{m_{Zn}(T_{eq}-T_{Zn})}[/tex]

Thus, by plugging in the given values we obtain:

[tex]C_{zinc}=\frac{-45.0g*4.184\frac{J}{g\°C}* (27.1\°C-98.8\°C)}{13.8g*(27.1\°C-98.8\°C)}\\\\C_{zinc}=0.400\frac{J}{g\°C}[/tex]

Best regards!

Answer:

1.092

Explanation:

Density = 1.0192 g/mL

oecific gravity = ?

Specific gravity is the ratio of a material's density with that of water.

The density of water at 4 degrees Celsius =  1 g/mL

Specific gravity = 1.0192 / 1 = 1.0192

Because specific gravity is a ratio, it has no dimension.

Answer:

c = 0.38 j/g.°C

Explanation:

Given data:

Heat absorbed by copper = 10 j

Mass of copper = 30 g

Initial temperature = 18.20°C

Final temperature = 19.07°C

Specific heat capacity of copper = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 19.07°C -18.20°C

ΔT = 0.87 °C

10 J = 30 g×c×0.87 °C

10 J = 26.1 g.°C×c

c = 10 J /26.1 g.°C

c = 0.38 j/g.°C

Answer: Diamond is the name ^-^

A food chain only follows just one path as animals find food. eg: A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. A food web shows the many different paths plants and animals are connected. eg: A hawk might also eat a mouse, a squirrel, a frog or some other animal.

Hope this helps ^_^

Answer:

anor277

Nov 17, 2017

Well, by definition,

Molarity

≡

Moles of solute

Volume of solution

Explanation:

And thus...

moles of solute

=

molarity

×

volume

We use a molar quantity of

80.3

⋅

g

174.01

⋅

g

⋅

m

o

l

−

1

=

0.461

⋅

m

o

l

with respect to

potassium sulfate

And thus

volume

=

moles of solute

molarity

80.3

⋅

g

174.01

⋅

g

⋅

m

o

l

−

1

3.12

⋅

m

o

l

⋅

L

−

1

=

0.148

⋅

L

.

The buoyant force is one that acts against the weight of an object suspended in a fluid. The value of the buoyant force on each are:

i. Buoyant force on the cube of iron = 25.0 N

ii. Buoyant force on the cube of wood = 1.20 N

Upthrust is a force which acts against the direction of the weight of an object when suspended in a fluid. It acts majorly upwards against gravity, and it can be referred to as a buoyant force.

The amount of upthrust on object in a fluid sometimes depends on the density, volume and gravity acting on the object.

So that;

Upthrust = density x volume x gravity

Thus from the given question;

i. The buoyant force on the cube of iron can be determined by:

Upthrust = 7.86 x [tex]10^{3}[/tex] * 3.25 x [tex]10^{-4}[/tex] * 9.8

              =  25.034

Upthrust = 25.0 N

Therefore, the buoyant force on the cube of iron is 25.0 N.

ii. The buoyant force on the cube of wood can be determined by:

Upthrust = 3.73 x [tex]10^{2}[/tex] * 3.25 x [tex]10^{-4}[/tex] * 9.8

              = 1.1880

Upthrust = 1.20 N

Therefore, the buoyant force on the cube of wood is 1.20 N.

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Answer:

helium

Explanation:

helium has the highest ionization energy level

An element's ability to attract shared electron thus forming covalent bonds is a measure of it's electronegativity. Hence, in other indicate decreasing level of electronegativity, arrow must point to the left across groups and down along the column.

Therefore, the arrow should point from right to left across the group and top to bottom along the columns.

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Answer:

b) From the person to the ice, and from the air to the ice

Explanation:

The direction of heat flow in the room is from the person to the ice and from the air to the ice.

The ice is at the lowest temperature.

Answer:

He won 32 games.

Explanation:

Another way of expressing 75% is 75/100.

To calculate how many games the baseball pitcher won, we multiply the total of games played (43, in this case) by the percent won:

43 * 75/100 = 32.25 ≅ 32

So the baseball pitcher won 32 games.