50 POINTS

Gizmos Moles Activity - chemistry

can someone please help me out

Answer:

Heat is the flow of thermal energy between two objects of different temperature whereas the thermal energy tells about how much is the transfer of energy due to temperature difference between two bodies. Hence thermal energy in transit gives heat

Answer:

the first one

Explanation:

I take this subject

Answer:

Neon

(if you want a thorough explanaion, just ask for one)

It is C! <3

The reason it's C because pt3 is Sugar science name get it?

Answer: 7.81 mol HgO (How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2?)

Explanation:

Answer:

Pancreas.

Explanation:

Living systems are self-organized life forms and are known to be very much interactive with their surroundings or environment. Also, living systems are dependent on the flow of information, matter and energy at various levels.

Some examples of living systems in organisms are respiratory system, nervous system, digestive system, and circulatory system.

Additionally, living systems comprises of the following components; cells, organs, muscle, tissues, blood, etc.

An endocrine system refers to a series of ductless glands and organs responsible for the production and secretion of hormones that are used by the body for the performance of various functions such as metabolism, controlling growth, reproduction, mood, sleep, etc. These hormones are secreted directly into the circulatory system (blood) and then transported to the organs and tissues in the body.

Pancreas is one of the glands of the endocrine and digestive systems that produces insulin to help control the body's sugar levels and enzymes which aid in digestion.

Answer:

Explanation:

When we say anything is a wave, what exactly do we mean? The most intuitive and straightforward wave to envision is a water wave. A motion, more specifically, is a disturbance that propagates or travels away from its source. Water waves are caused by a disruption in the water's surface, such as a rock tossed into a pond or a swimmer splashing the surface continuously. The noise for sound waves is a rise of air pressure, which may be caused by the oscillating cone within a speaker. There are many kinds of disturbances in earthquakes, including surface disturbances and pressure disturbances under the surface. Even radio signals are best deciphered by using a comparison of sea waves Water waves are helpful to visualize since they are more than just a mental picture. The amplitude, period, frequency, and energy of water waves are all the same as they are for all waves. A small set of underlying principles can be used to describe all wave characteristics.

(hope this helps can i plz have brainlist :D hehe)

Answer:

Respiration

Explanation:

Respiration is the system of how an animal breathes

Answer:

223 g KCl

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[RxN - Balanced] Cl₂ + 2KBr → Br₂ + 2KCl

[Given] 356 gg KBr

[Solve] g KCl

Step 2: Identify Conversions

[RxN] 2 mol KBr → 2 mol KCl

[PT] Molar Mass of K - 39.10 g/mol

[PT] Molar Mass of Br - 79.90 g/mol

[PT] Molar Mass of Cl - 35.45 g/mol

Molar Mass of KBr - 39.10 + 79.90 = 119 g/mol

Molar Mass of KCl - 39.10 + 35.45 = 74.55 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

223.024 g KCl ≈ 223 g KCl

Answer: the answer is “C”

Explanation:

Took the T E S T

Answer:

20ppm

Explanation:

parts per million are defined as the mass of solute in mg (In this case, mass of DDT) per kg of sample.

To solve this question we must find the mass of DDT in mg and the mass of sample in kg:

Mass DDT:

0.10g * (1000mg / 1g) = 100mg

Mass sample:

5000g * (1kg / 1000g) = 5kg

Parts per Million:

100mg / 5kg =

Answer:

3.25 M

Explanation:

Number of moles = mass/ molar mass

mass of  NaOH = 65 g

Molar mass of NaOH = 40 g/mol

Number of moles of NaOH = 65g/40 g/mol = 1.625 moles

Let us recall that;

n = CV

n = number of moles of solute

C = concentration of solution

V = volume of solution

C = n/V

n = 1.625 moles

V = 500/1000 L = 0.5 L

C = 1.625 moles/0.5

C = 3.25 M

Answer:

the answer is wurkey churkey since the birdy is really really cute

Explanation:

if the birdy was not squishy then it would have died already?!?!?

Answer:

i think the answer would be C

Explanation:

no matter what you do to the jar the mass will stay the same. unless you add more nails

Answer:

3 KOH(aq) + H3PO4(aq) = K3PO4(aq) + 3 H2O

Explanation:

Answer:

hi

Explanation:

because

Answer:

5 L

Explanation:

Molarity = mol/L   ---->    L = mol/molarity

2.0 moles / 0.4 M HF = 5 L

Answer:

Carbon Dioxide

Explanation:

Carbon dioxide gets turned into oxygen

Answer:

64852.94 N/m²

Explanation:

From the question,

P = F/A.................... Equation 1

Where P = Pressure of the Elephant on the ground, F = Weight of the Elephant, A = Area of the sole of the four legs.

But,

F = mg.............. Equation 2

Where m = mass of the elephant, g = acceleration due to gravity

Substitute equation 2 into equation 1

P = mg/A............ Equation 3

Given: m = 4500 kg, A = (1700×4) cm² ( The elephant has four legs) = 6800 cm² = 0.68 m²

Constant; g = 9.8 m/s²

Substitute these values into equation 3

P = (4500×9.8)/0.68

P = 64852.94 N/m²

Answer:

Explanation:

The metal is classified as a transition metal or transition element. In particular, this atom is Copper it has an atomic number of 29 which we know by the number of protons. The number of protons in an atom is the same as the atomic number.

Answer:

Copper

Explanation:

Each atom in the metal contains 29 protons.

Answer:

When she adds lemon juice

Explanation:

I believe that it is when she adds lemon juice. Lemon juice is an acid, which causes a chemical reaction. It turns from purple to pink because of the acid. Lmk if it's right but I'm 99.9% percent certain it is correct.

Answer:

The theoretical yield of ammonia is 15 g.

Explanation:

The statements are:

2.8g of hydrogen are left over.

Hydrogen is the excess reactant.

Nitrogen is the limiting reactant.

The theoretical yield of ammonia is 15 g.

To solve this question we must find the moles of each reactant. Thus, we can find the limiting reactant. With limitinf reactant we can find the theoretical yield and the amount in excess of the reactant that is in excess:

Moles Nitrogen -28g/mol-

10.0g * (1mol / 28g) = 0.357 moles

Moles hydrogen -2g/mol-

5.0g * (1mol / 2g) = 2.5 moles

For a complete reaction of 0.357 moles of nitrogen are required:

0.357mol N2 * (3mol H2 / 1molN2) = 1.071 moles hydrogen.

As there are 2.5 moles of hydrogen, hydrogen is the excess reactant and nitrogen is the limiting reactant

The moles of hydrogen that are left over are:

2.5moles - 1.071moles = 1.429moles Hydrogen

The mass is:

1.429moles Hydrogen * (2g / mol) = 2.8g of hydrogen are left over

The moles of ammonia produced are:

0.357mol N2 * (2mol NH3 / 1molN2) = 0.714 moles of ammonia are produced (Theoretical moles)

The theoretical mass is (Molar mass NH3 = 17g/mol):

0.714 moles of ammonia * (17g / mol) =

12g of ammonia is the theoretical mass

The false statement is:

The false statement, when 10 g of nitrogen reacts with 5.0 g of hydrogen to produce ammonia is that the theoretical yield of ammonia is 15g.

Moles of any substance will be calculated as:

n = W/M, where

W = given mass

M = molar mass

Given chemical reaction is:
N₂(g) + 3 H₂(g) → 2 NH₃(g)

Moles of 10g of N₂ = 10/28 = 0.357 moles

Moles of 5g of H₂ = 5/2 = 2.5 moles

From the stoichiometry of the reaction:

1 mole of N₂ = react with 3 moles of H₂

0.357 moles of N₂ = react with 3×0.357=1.071 moles of H₂

Here nitrogen is the limiting reactant and hydrogen is excess reactant, and formation of ammonia depends on the limiting reactant.

1 mole of N₂ = react with 2 moles of NH₃

0.357 moles of N₂ = react with 2×0.357=0.714 moles of NH₃

Now we calculate the mass of ammonia from the given moles as:

M = (0.714) (17) = 12 g.

Hence, the false statement is that theoretical yield of ammonia is 15g.

To know more about moles, visit the below link:
https://brainly.com/question/15356425

Answer:

The candy coating is made up of coloring and sugar. The coloring and the sugar molecules both have positive and negative charges on them. The water molecule has positive and negative charges so it can attract and dissolve the color and sugar pretty well.

Explanation:

go to https://www.acs.org/content/acs/en/education/whatischemistry/adventures-in-chemistry/experiments/dissolving-m-ms.html#:~:text=The%20candy%20coating%20is%20made,color%20and%20sugar%20pretty%20well.

Answer:

(top to bottom)

0.50

0.63

0.83

1.0

1.3

2.5

Explanation:

Answer:  Answers are from top to bottom (Edmentum)

0.50

0.63

0.83

1.0

1.3

2.5

Explanation:

Answer:

12.3 kJ

Explanation:

For a given substance, the molar heat of fusion basically tells you one thing from two perspectives

how much heat is needed in order to melt one mole of that substance at its melting point

how much heat must be removed in order to freeze one mole of that substance at its freezing point

It is very important to realize that the molar enthalpy of fusion will carry a positive sign when you're dealing with melting and a negative sign when you're dealing with freezing.

Answer:

increase thickness of insulation

Explanation:

don't increase amount of heating because that's difficult and not efficient.

don't increase surface area of walls because that makes heat be lost quicker.

don't increase windows because windows lose heat worse than walls.

increase thickness of insulation because it's the most effiecient and effective method of keeping heat.

Answer: 4. We know that one mole of any chemical compound always contains 6.022 x 10^23 molecules. Therefore, we can calculate the number of molecules of 2.25 moles of sulfur dioxide SO2 by multiplying the number of moles by the Avogadro's constant 6.022 x 10^23:    

    2.25 moles SO2 (6.022x10^23 molecules/1mole) = 1.355 x 10^24 molecules of sulfur dioxide

5. The number of moles of sodium chloride are 0.40 moles

Explanation:

Answer:

Methane has one atom of carbon and four atoms of hydrogen.

Propane has three carbon atoms and eight atoms of hydrogen.

Answer:

I would say A but I'm not sure

When tin metal is placed into a solution of nickel (II) iodide then nothing will occur.

Reactivity series of the metals tells about the increasing or decreasing orders of the reactivity of the metals.

According to the reactivity series, reactivity of nickel metal is more than the tin metal. So, if we add tin metal in the solution of nickel (II) iodide then no reaction occurs. Because the reactivity of tin is less as compare to nickel metal so it is not possible for tin to replace the nickel metal and get dissolve.

Hence, option (C) is correct i.e. nothing.

To know more about reactivity series, visit the below link:
https://brainly.com/question/17469010

Answer:

Thomson--atoms cotain electron

Ernest Rutherford--atoms have a positive nucleus

R.A Millikan--electrons have Q=-1

Dalton--atoms are indivisible

Millikan---> Electrons have a charge of -1

Rutherford ---> Atoms have a positive nucleus

Thomson -----> Atoms contain electrons

Dalton --------> Atoms are indivisible

The atomic theory went through several modifications and different scientists proposed various models of the atom until our present conception of the atom was developed.

The atom was first defined as the smallest indivisible particle of a substance. This idea of "indivisibility" of the atom stems from Dalton's theory.

The fact that atoms were composed of negatively charged electrons was proven by the experiments of J.J Thompson using the cathode ray tube. Millikan's charge to mass experiment showed that the electron has a charge of -1.

Rutherford, in his famous gold foil experiment showed that atoms were composed of a positively charged nucleus.

Learn more: https://brainly.com/question/1596638

Answer:

Las cargas eléctricas de los objetos son ambas positivas o son ambas negativas.

Explanation:

Si dos objetos presentan fuerzas eléctricas repulsivas entre sí, quiere decir que ambos tienen el mismo tipo de carga.

Las cargas iguales (positivo con positivo, o negativo con negativo) se repelen, mientras que las cargas diferentes (positivo con negativo) se atraen.