15 POINTS!!!!! NEED ASAP!!!
1. Describe the differences between scale and proportion in relation to a scientific model.

2. In your own words, describe why scientific models are useful, even though much of the time their scale or proportions are not accurate when compared to the real thing.

3. Describe how atoms can be mostly empty space, even though they are the building blocks of everything in the universe. (i.e. how can your desk be made of atoms which are mostly empty space if it is solid?)

4. We learned about three different types of graphs. Describe each type of graph briefly, including what data goes where, then input a picture example of each type of graph.

Line Graph

Bar Graph

Circle Graph

Answer:

i dont know but it is probily 4 and 6

Answer:

1.54 x 10⁻¹¹kg

Explanation:

The charge to mass ratio is given as:

               1.044 x 10⁻⁸kg/C

 Charge on the proton  = 1.602 x 10⁻¹⁹C

 So;

    \(\frac{e}{m}\)   is the charge to mass ration

e is the charge

m is the mass

  1.044 x 10⁻⁸kg/C  = \(\frac{1.602 x 10^{-19} }{m}\)    

    m = \(\frac{1.602 x 10^{-19} }{1.044 x 10^{-8} }\)   = 1.54 x 10⁻¹¹kg

Table salt does not melt on the stove, it dissolves in water and does not conduct electricity.

There are several substances listed in the table Epsom salt is another one of these substances. It does not melt on a stove, it dissolves in water and also conducts electricity.

Finally, potassium chloride does not melt on the stove, it dissolves in water and it does conduct electricity. These are the experiences one can have with these common substances.

Learn more about conductivity here:

https://brainly.com/question/28869256

#SPJ1

Answer:

To design a robot that propels itself across an ice rink using the same principles as rockets, I would start by considering the materials that would be suitable for use on ice. Some materials that might work well for this purpose include plastic, rubber, and certain types of metal, such as aluminum or stainless steel.

Explanation:

Answer:

Explanation:

Students learn about humankind’s search for life in outer space and how it connects to robotics and engineering. NASA is interested in sending exploratory missions to one of Jupiter’s moons, Europa, which requires a lot of preparatory research and development on Earth before it can happen. One robot currently being engineered as a proof of concept for a possible trip to explore Europa is the Icefin, which is an innovative robot that can explore under ice and in water, which are the believed conditions on Europa. This lesson provides students with intriguing information about far off (distance and time!) space missions and field robotics, and also sets up two associated robotics and arts integration activities to follow. The lesson can be used individually to provide new information to students, or as a precursor to the associated activities. A PowerPoint® presentation and worksheet are provided

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

the amount of water vapor in the air compared to the amount it can hold

Explanation:

By definition, relative humidity is equal to the partial pressure of water divided by the total amount of water that the air can hold at that temperature. The last one basically restates the definition. (Partial pressure is the number of particles of a substance divided by the total number of particles.)

(Have a nice day too! Don't hesitate to ask any questions)

There will be 0.39 moles

Take a look at the He gas in the tank:

P = 2.80 atm, or pressure

Volume = 5.00 liters.

T = (273 + 155) is the temperature. K = 428 K

R = 0.08206 L atm/L of gas (mol K)

Charle's law, Boyle's law, and Gay-Lussac law are the three gas laws that make up the combined gas law, commonly referred to as a general gas equation. For a certain amount of gas, the law illustrates the relationship between temperature, volume, and pressure.

Gas law PV = nRT

So, n = PV/. (RT)

He gasses number = 2.80 x 5.00 / (0.08206 x 428) mol equals 0.39 mol.

Learn more about Gas law here-

https://brainly.com/question/12667831

#SPJ9

Answer: See explanation

Explanation:

Vacuum filtration is referred to as a fast filtration technique that is used in the separation of solids from liquids. It is also used to collect a desired solid. It basically uses a side-arm flask and a Buchner funnel.

Based on the question, the techniques that should be used to ensure a quantitative separation goes thus:

• Wet the filter paper before the mixture is poured into the filter funnel.

• Then, carefully rinse the flask with a little amount of water into the filter funnel.

• After that, the solid on the filter paper should be washed the with a small amount of water.

• Finally, Dry the solid on the filter paper when the separation is done.

To find moles when given the molar mass, you can use the concept of molar mass as a conversion factor.Molar mass represents the mass of one mole of a substance, expressed in grams per mole (g/mol).

To calculate moles, divide the given mass of the substance by its molar mass. The equation is:

moles = mass / molar mass

For example, if you have 56 grams of carbon dioxide (CO2) and want to find the number of moles, you need to know the molar mass of CO2, which is approximately 44 g/mol. Using the equation above:

moles = 56 g / 44 g/mol

moles ≈ 1.27 mol

Therefore, there are approximately 1.27 moles of carbon dioxide in 56 grams.

For more such questions on molar mass

https://brainly.com/question/29424807

#SPJ8

Answer:

J/g°C=H

H×g°C=J

H×g°C/H×g=J/H×g

Answer:

C3H7O + O2 → CO2 + H2O

Explanation:

a) The full symbol equation for the oxidation reaction of an isomer of C3H7O can be represented as:

C3H7O + O2 → CO2 + H2O

b) The proper reagent for this oxidation reaction is O2 (oxygen gas). The catalyst required for this reaction depends on the specific conditions. Common catalysts used for oxidation reactions include transition metals such as platinum (Pt), palladium (Pd), or copper (Cu).

c) There is no need to remove the product (CO2 and H2O) from the reaction vessel because they are typically in the gas or liquid phase and do not significantly interfere with the reaction. The product gases can be easily vented out of the vessel, while the liquid water can be left in the reaction mixture. Additionally, the product CO2 is a stable and inert gas, which does not pose any hazards in most cases. Therefore, it is often not necessary to remove the products after the reaction is complete.

Answer:

177.3 meters per second

Explanation:

Assuming that both gases are at the same temperature, we can use Graham's law to calculate the ratio of the average speeds of N2 and He molecules:

(ratio of speeds) = sqrt(molar mass of He/molar mass of N2)

The molar mass of N2 is 28.02 g/mol, and the molar mass of He is 4.00 g/mol. Therefore:

(ratio of speeds) = sqrt(4.00/28.02) = 0.379

We know that the average speed of N2 molecules is 468 m/s. Therefore:

(average speed of He molecules) = (ratio of speeds) x (average speed of N2 molecules) = 0.379 x 468 m/s = 177.3 m/s

Therefore, the average speed of He molecules at the same temperature is approximately 177.3 meters per second.

ANS

64.066 g/mol

Formula : SO ²

Boiling point : - 10 °C

Answer:

$1246.90

Explanation:

Since the bike lost \(20%\)% of it's value and it now currently at $\($1039\), we have to do 20% * $1039 to find the amount of money lost. 20%*1039=207.8. We have to add it up to find the original value so 1039+207.8=$1246.8

The volume in liters of seawater that must be processed to recover 31.1 g of gold is 2.827 * 10⁶ Liters of seawater.

The concentration of gold found in the seawater sample is given as 1.1 × 10⁻² ppb.

1 ppb is equivalent to 1 μg/mL

Based on the above conversion, 1.1 × 10⁻² ppb =  1.1 × 10⁻² μg/mL

This means that 1 mL of the seawater sample contains 1.1 × 10⁻² μg of gold.

1.1 × 10⁻² μg = 1.1 × 10⁻² μg * 10⁻⁶ g/μg

1.1 × 10⁻² μg = 1.1 × 10⁻⁸ g of gold

The volume of seawater in liters that will produce 31.1 g of gold is calculated below as follows:

The volume of seawater required = 31.1 g * 1 mL/1.1 × 10⁻⁸ g * 1 L/1000 mL

The volume of seawater required = 2.827 * 10⁶ Liters of seawater.

Learn more about concentration in ppb at: https://brainly.com/question/28453203

#SPJ1

Some strategies which are used to improve the powerless language include the reduction of the use of the following below:

This is referred to as the type of language which suggests to listeners that you are uncertain, insufficient, and not entirely confident with oneself due ti various reasons.

Examples of the reasons are the use of hedges , intensifiers etc which have negative effects on how the speaker is perceived.  It is usually characterized by Hesitation like “Well” or “Um” etc and it should be avoided to improve it thereby making it he correct choice.

Read more about Powerless language here https://brainly.com/question/10670117

#SPJ1

They contain Carbon, Nitrogen, Hydrogen, Oxygen, and Sulfur

Using the prefix method for covalent compounds, the names of the given compounds are shown below:

LIF: Lithium fluoride

Cl2O7: Dichlorine heptoxide

N2O3: Dinitrogen trioxide

SF6: Sulfur hexafluoride

Na3PO4: Sodium phosphate

A covalent bond is  described as a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

The properties of covalent compounds includes:

Learn more about covalent compounds at:

https://brainly.com/question/3447218

#SPJ1

Zn (s) + 2 HCl (aq) --→ ZnCl2 (aq) + H2 (g) Zn being oxidized during the reaction: Correct answer is 1. oxidized. Zn's oxidation status is shifting from 0 to +2.

A chemical process called oxidation occurs. As a result of atoms or groups of atoms losing electrons, it is described as a process. The addition or loss of oxygen or hydrogen in a chemical species is another method to define oxidation. An oxidation reaction takes place when oxygen interacts with a substance or an element. Another way to think of oxidation is as the process of removing hydrogen from the species of reactants. Molecule, atom, or ion oxidation is the process of losing electrons. Initially, reactions where an element interacts with oxygen were referred to as oxidations. For instance, the chemical interaction between magnesium metal and oxygen to produce magnesium oxide is the oxidation of magnesium.

To learn more about oxidation here

https://brainly.com/question/27239694

#SPJ4

A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

For more such questions on renewable resources visit:

https://brainly.com/question/27734408

#SPJ8

The value of K is 4.4 represents the equilibrium position of the reaction under the given conditions.

The equilibrium constant (K) for a reaction is a constant value that relates the concentrations of the reactants and products at equilibrium. For the given reaction, the equilibrium concentrations of SO₂, O₂, and SO₃ are given as [SO₂] = 1.50 M, [O₂] = 1.25 M, and [SO₃] = 3.50 M, respectively.

The equilibrium constant (K) for the reaction can be calculated using the equilibrium concentrations of the reactants and products.

K = [SO₃]²/([SO₂]²[O₂])

K = (3.50)²/[(1.50)²(1.25)]

K = 4.48

Therefore, the equilibrium constant (K) for the reaction is 4.48.

To know more about the Balancing equations, here

https://brainly.com/question/7181548

#SPJ1

Answer

By adding water (H2O)

Explanation

In this reaction, water is a product, adding the product will favour the reverse reaction, which is the formation of more Co(H2O)6^2+.

Answer:

A precipitate will form when a freshly prepared aqueous carbonic acid solution is added to an aqueous solution of Calcium Hydroxide.

Explanation:

A precipitate will form when a freshly prepared aqueous carbonic acid

solution reacts with an aqueous solution of Calcium Hydroxide

Ca(OH)₂ + H₂CO₃ → CaCO₃ + 2 H₂O

This is an example of a neutralization reaction between the acid ( H₂CO₃)

and a base ( Ca(OH)₂ ) to form a precipitate known as Calcium

carbonate(CaCO₃).

The product which is Calcium carbonate(CaCO₃) is also referred to as calcite

or chalk.

Read more on https://brainly.com/question/20400540

Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

for more questions on polystyrene

https://brainly.com/question/15913091

#SPJ8

Answer:its saturated   or  unsaturaded

Explanation:

Answer:

White dwarf.

Explanation:

its the most furthest.

(2)(½^(15/3)) = 0.0625 (5 half-lives) 102.4 grams order

To learn more about half-life of an isotope refers to:

brainly.com/question/25917167

#SPJ1