My topic is cell phone radiation’s for my stem fair project, what should be my question and hypothesis?

The volume of the tin piece in cubic centimetres is 4.3 cm³

A graduated cylinder is a standard piece of laboratory glassware used to measure the volume of an object or amount of liquid. As its name indicates, it is a glass cylinder with marks along the side similar to those on a measuring cup.

When adding an object to a liquid, the displayed volume difference corresponds to the volume of the added object.

In this way, to find the value of the object's volume, subtract the initial volume from the final volume:

16.8ml - 12.5ml = 4.3ml

To convert to cubic centimetres, the conversion scale of volume and length measurements need to be used, finding that mL is equal to cubic centimetres. So, the final answer is:

4.3 cm³

Learn more about graduated cylinders:

https://brainly.com/question/26145096

#SPJ1

Answer:

A.Catalyst

Explanation:

the correct answer is A

Answer:

b

Explanation:

Answer:

D. the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure

Explanation:

Facilitated diffusion can be represented by drawing molecules passing through a membrane protein, and to represent active transport you can add an ATP to the same figure.

In facilitate diffusion particles move through the cell membrane due to open proteins, this can be represented by showing a membrane protein that is allowing particles to enter or exit.

Similarly, in active transport molecules move through the cell membrane through a membrane protein, but ATP is required. Therefore, to represent this make sure to add an ATP.

Learn more about transport in https://brainly.com/question/29851765

#SPJ1

The reaction is 2 C6H6 + 15 O2 -> 12 CO2 + 6 H2O.

What is combustion?

Combustion is the oldest technology known to mankind and one of our most significant discoveries or inventions. Combustion has been around for a very long time. Fire, along with earth, water, and air, was thought to be one of the four basic elements in the cosmos from antiquity through the mediaeval centuries. Combustion, explosion, and flame have all been observed and speculated since the dawn of time. Each culture has its own explanation. The Greeks explained combustion in terms of philosophical beliefs, one of which was that all fuel bodies included a "inflammable essence," which exited when the body was burned to react with air.

The reaction is:

C6H6 + O2 -> CO2 + H2O

Balance C:

C6H6 + O2 -> 6 CO2 + H2O

Balance H:

C6H6 + O2 -> 6 CO2 + 3 H2O

Balance O:

2 C6H6 + 15 O2 -> 12 CO2 + 6 H2O

The reaction is 2 C6H6 + 15 O2 -> 12 CO2 + 6 H2O.

Learn more about combustion from given link

https://brainly.com/question/13251946

#SPJ4

To predict which compound in each group is more soluble in water, we'll consider their molecular structures and their ability to form hydrogen bonds with water.

A more detailed explanation of the answer.
A) Butan-1-ol, pentan-1-ol, or propan-2-ol:
Propan-2-ol is more soluble in water due to its smaller size and the hydroxyl group (-OH) being attached to the central carbon. This allows it to form stronger hydrogen bonds with water, increasing its solubility.

B) Chlorocyclohexane, cyclohexanol, or cyclohexane-1,2-diol:
Cyclohexane-1,2-diol is more soluble in water due to the presence of two hydroxyl groups, which can form multiple hydrogen bonds with water molecules, increasing its solubility.

C) Phenol, cyclohexanol, or 4-methylcyclohexanol:
Cyclohexanol is more soluble in water among the three compounds. Phenol has a benzene ring that reduces its solubility, and 4-methylcyclohexanol has a methyl group that also reduces its solubility. Cyclohexanol, with only one hydroxyl group and no additional hindering groups, can form better hydrogen bonds with water, resulting in higher solubility.

Learn more about hydroxyl group (-OH).

brainly.com/question/4682253

#SPJ11

Answer:

In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles. With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion.

Explanation:

In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles. With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion.

Answer:2.3×10^11

Explanation:since scientific notation is as a×10^k with 0<a<=9

Answer:

D. Fetus

Explanation:

Answer:

p=5.0g/cm³

Explanation:

density formula

p=m/v

And if im not mistaken the stone weighs 200grams

The Volume of the tube increases by 40

So

p=200/40

p=5.0g/cm³

Answer:

To get the answer, you want to look at the balanced equation and note that 2 moles of aluminum (Al) can produce 1 mole of aluminum oxide (Al2O3). That's the critical relationship that exists.

Because the two ester groups that react are found in the same molecule, the reaction is intramolecular. As a result, one cyclic β-ketoester product is produced.

The Dieckmann reaction is the name for intramolecular Claisen condensation in dibasic acid esters. Cycle 13-ketone derivatives are always the end products. The condensing bases could be potassium t-butoxide, sodium, sodium ethoxide, sodium hydride, etc.

The reason only one product is formed from B is because the reaction conditions promote intramolecular cyclization via the Dieckmann condensation reaction. This reaction involves the formation of a cyclic β-ketoester by the condensation of two ester groups within the same molecule. In the case of B, the presence of three ester groups might suggest the formation of three different cyclic products. However, the reaction conditions used in this case, i.e., treatment with sodium methoxide in methanol followed by acid workup, promote selective formation of the most stable cyclic β-ketoester product, which is the only observed product.

The reaction occurs in the following steps:

1. Deprotonation of one of the ester groups by sodium methoxide to form an enolate intermediate.

2. Nucleophilic attack by the enolate on the adjacent ester group, resulting in cyclization and formation of a five-membered ring.

3. Protonation of the intermediate by water in the acidic workup step to form the final product.

The reaction is intramolecular because the two ester groups that react are present in the same molecule. This leads to the formation of a single cyclic β-ketoester product.

Learn more about Dieckmann Reaction on:

https://brainly.com/question/30217449

#SPJ11

Answer:

Two design criteria for the design of the ammonia making process are;

1) Sustainable hydrogen production by renewable energy

2)  Sustainable use of the ammonia-water thermal absorption cycle to retrieve the ammonia present in the waster water

Explanation:

Ammonia is produced from natural gas in the following process;

H₂ + RSH → RH + H₂S

H₂S + ZnO → ZnS + H₂O (Waste water)

CH₄ + H₂O → CO + 3H₂

CO + H₂O → CO₂ + H₂

Ammonia is then produced by reacting the produced hydrogen with nitrogen in the presence of a catalyst in a process known as the Haber-Bosch process as follows;

3H₂ + N₂ → 2NH₃

The

The design criteria for the design of the ammonia making process therefore as follows;

1) Sustainable use of renewable energy to produce hydrogen gas from the electrolysis of water

2)  Use of the ammonia-water thermal absorption cycle to retrieve the ammonia present in the waster water.

The branch of science which deals with chemicals and their bond is called chemistry.

The two ways by which we can design ammonia making process is as follows:-

Two design criteria for the design of the ammonia making process are:-

The usage of ammonia is important in these ways:-

Hence, these are the design for the ammonia-making process.

For more information, refer to the link:-

https://brainly.com/question/19524691

The property of the solid that contributes to an uncertainty in the number of moles used is the solubility of the solid in the solvent.

If the solubility of the solid is high in the solvent, it will dissolve easily and the number of moles used will be accurate. However, if the solid is not very soluble in the solvent, it may not dissolve completely and this will lead to an uncertainty in the number of moles used. This is because some of the solid may remain undissolved and not be included in the reaction, leading to an inaccurate measurement of the number of moles used.

To know more about solubility refer here:

https://brainly.in/question/30915083#

#SPJ11

Answer:

The correct answer is - B. Groups of the ancestral species became isolated and adapted to different environments.

Explanation:

Two finches Warbler Finch and Woodpecker Finch are two distinct finches are finches from the Galapagos Islands. Both of these finches have a common ancestor from South America.

The most likely explanation of developing two distinct species from an ancestral finch is by bein isolated and developed or adapted according to the challenges and environmental conditions and ultimately become different species after several generations.

Answer:

D

Explanation:

Most of the fluids have some resistance to their movement due to viscosity. The gases also exhibit viscosity. The molecules that make up olive oil are larger as compared to alcohol. So olive oil has high viscosity. The correct option is D.

The viscosity of a fluid can be defined as the measure of a fluid's resistance to flow. It can also be known as the measure of a fluid's thickness or its resistance to the objects passing through it.

A fluid with high viscosity resists motion because of its strong intermolecular forces which gives high internal friction. The fluids can flow easily if they have very little intermolecular force of attraction. The SI unit of viscosity is poiseiulle (PI).

Here the molecules which make up the olive oil are found to be shorter than those which make up alcohol. So the oilve oil molecules have more resistance to sliding past one another.

Thus the correct option is D.

To know more about viscosity, visit;

https://brainly.com/question/30759211

#SPJ3

Activation energy is the minimum amount of energy required for a chemical reaction to occur. Lowering the activation energy effectively speeds up the reaction by making it easier for reactant molecules to overcome the energy barrier and proceed to the product formation.

1) Ferric Ions:

When ferric ions (Fe3+) lower the activation energy from 18 to 13 kcal/mol, it means that the presence of these ions facilitates the reaction by providing an alternative pathway with a lower energy barrier. The reaction can proceed more readily in the presence of ferric ions because they interact with the reactants or intermediates in a way that stabilizes them or helps them adopt a more favorable configuration. By reducing the activation energy from 18 to 13 kcal/mol, the ferric ions effectively make it easier for the reactant molecules to reach the transition state and undergo the reaction, resulting in an overall faster rate of the chemical reaction.

2) Catalase:

Catalase is an enzyme that catalyzes the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). When catalase lowers the activation energy from 18 to 7 kcal/mol, it signifies that the enzyme significantly accelerates the reaction by providing an alternative reaction pathway that has an even lower energy barrier. Catalase achieves this by binding to the reactant molecules (H2O2) in a specific orientation, which facilitates the breaking of chemical bonds and the formation of product molecules (H2O and O2). The lower activation energy of 7 kcal/mol, compared to the original 18 kcal/mol, means that catalase provides a highly efficient pathway for the reaction, resulting in a substantially faster rate of hydrogen peroxide decomposition.

Learn more about Activation energy here : brainly.com/question/28384644
#SPJ11

Answer:

water is not a solid and a rock is a solid

To make a 1 M solution of NaCl with a volume of 100 mL, you will need to weigh out 5.844 grams of NaCl.What is molarity?Molarity is a measure of the concentration of a solution and is expressed as the number of moles of solute per liter of solution.

For such more question on Molarity

https://brainly.com/question/30404105

#SPJ11

Answer:

A liquid

Explanation:

Liquids has an indefinite shape, which means it could change from one shape to another. For example, if you pour water into a rectangular fish tank. The shape of the liquid changes into a rectangle. Definite volume means its volume is consistent and that it is unchangeable. If you fill the rectangular fish tank with water, the volume of the water stays the same even though it changes shape.

Hope this helps.

The ratio of buffer C₂H₃O₂ /HC₂H₃O₂  must you use are1:0.199 or 10:2

the ratio of buffer C₂H₃O₂ /HC₂H₃O₂  can be calculate using the Henderson-Hasselbalch Equation which relates the pH to the measure of acidity pKa. The equation is given as:

pH = pKa + log ([base]/[acid]

Where,

[base] = concentration of C₂H₃O₂in molarity or moles

[acid] = concentration of HC₂H₃O₂ in molarity or moles

For the sake of easy calculation, allow us to assume that:

[base] =1

[acid] = x

Therefore using equation 1,

5.44 = 4.74 + log (1 / x)

log [base / acid] = 0.7

1 / x = 5.0118

x = 0.199

The required ratio of buffer C₂H₃O₂ /HC₂H₃O₂ is 1:0.199 or 10:2

learn more about buffer ratio here https://brainly.com/question/4342532

#SPJ4

Answer:

its B

Explanation:

this is pretty obvious since I know about this and did it already.

I Hope this helps!

GOODLUCK!!!!!!!

Answer:

0.241 M

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

HBr + NaOH —> NaBr + H₂O

From the balanced equation above,

The mole ratio of acid, HBr (nₐ) = 1

The mole ratio of base, NaOH (n₆) = 1

Finally, we shall determine the concentration of the NaOH solution. This can be obtained as follow:

Volume of base, NaOH (V₆) = 20 mL

Volume of acid, HBr (Vₐ) = 24.1 mL

Concentration of acid, HBr (Cₐ) = 0.2 M

Concentration of base, NaOH (C₆) =?

CₐVₐ / C₆V₆ = nₐ/n₆

0.2 × 24.1 / C₆ × 20 = 1/1

4.82 / C₆ × 20 = 1

Cross multiply

C₆ × 20 = 4.82

Divide both side by 20

C₆ = 4.82 / 20

C₆ = 0.241 M

Therefore, the concentration of the NaOH solution is 0.241 M

Answer:

I'm assuming you need to label above the lines. So, above the line where the  Cretaceous period ends is mass extinction and where the bracket lies is adaptive radiation.

Explanation:

Mass extinctions are periods of time where the organisms are essentially wiped out in an extremely brief period of time. You can see how the species just drops off. Adaptive radiation occurs when there is a diversification of a group of organisms as evident by the rise in the number of marine animal groups shown by the bracketed area.

Cohesive properties of water makes it move upward from the roots of plants.

The cohesive properties of water which is caused due to hydrogen bonding between adjacent water molecules allow the column of water to be 'pulled' up through the plant as water molecules present at the surfaces of leaf cells are evaporating. This process of water uptake in plants due to cohesion has been termed as the Cohesion Theory of Sap Ascent in plants.

There are three properties of a water molecule which enables it to move from the root system to the leaves of the plant. The three properties are cohesion, adhesion, and high surface tension.

Hence, option C is correct.

Learn more about cohesion properties from the link given below.

https://brainly.com/question/29598400

#SPJ4

A solution with a pH of 3.47 has an [OH-] of 4.83 x 10^-11 M.

To find the [OH-] of a solution with a pH of 3.47, we can use the relationship between pH and [H+]. pH is defined as the negative logarithm of the hydrogen ion concentration [H+], and [OH-] and [H+] are related through the ion product constant of water, Kw = [H+][OH-] = 1.0 x 10^-14 at 25°C.
To start, we can use the equation for pH:
pH = -log[H+]
Rearranging this equation to solve for [H+], we get:
[H+] = 10^-pH
Substituting the given pH value of 3.47 into this equation, we get:
[H+] = 10^-3.47
[H+] = 2.07 x 10^-4 M
Now that we know the concentration of [H+] in the solution, we can use the ion product constant of water to find [OH-]:
Kw = [H+][OH-]
1.0 x 10^-14 = (2.07 x 10^-4)[OH-]
[OH-] = 4.83 x 10^-11 M
Therefore, a solution with a pH of 3.47 has an [OH-] of 4.83 x 10^-11 M.

for more such question on pH

https://brainly.com/question/12609985

#SPJ8

Answer:

CaBr2

Explanation:

There is one calcium atom and 2 Bromine atoms.

Hope this helps!

To solve this problem, we can use Charles's Law, which states that at constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin (K).

First, we need to convert the temperatures from Celsius to Kelvin using the equation:

T(K) = T(°C) + 273.15

Given:

Initial volume (V1) = 4.37 L

Initial temperature (T1) = 47.0°C = 47.0 + 273.15 K

Final temperature (T2) = 94.0°C = 94.0 + 273.15 K

Using the ratio of the temperatures, we can set up the following proportion:

V1 / T1 = V2 / T2

Solving for V2 (the volume at the final temperature):

V2 = (V1 / T1) * T2

Substituting the given values:

V2 = (4.37 L / (47.0 + 273.15 K)) * (94.0 + 273.15 K)

Calculating the value:

V2 ≈ (4.37 L / 320.15 K) * 367.15 K

V2 ≈ 5.038 L

Therefore, the volume of the balloon at 94.0°C will be approximately 5.038 L.

Learn more about  Charles's Law here:

https://brainly.com/question/14842720

#SPJ11

Liquid to gas - Boiling: The phase change from a liquid to a gas that occurs when the substance reaches its boiling point, resulting in the formation of vapor.

Solid to gas - Sublimation: The phase change from a solid directly to a gas without going through the liquid state.

Solid to liquid - Melting: The phase change from a solid to a liquid when heat is applied, causing the substance to transition from a rigid to a more fluid state.

Liquid to solid - Freezing: The phase change from a liquid to a solid when the substance loses heat, resulting in the formation of a solid crystal lattice.

Therefore, the correct match would be:

Liquid to gas - Boiling

Solid to gas - Sublimation

Solid to liquid - Melting

Liquid to solid - Freezing

To learn more about phase change of matter, visit:

https://brainly.com/question/30720253

#SPJ11