Complete the structure of poly propane in the equation.

Answer: The density of the material is 2.66 g/mL and it is likely this  is made of Aluminum

Explanation:

The first step to know the material of the chunk of metal is to calculate its density. The general formula for density is P (density) = [tex]\frac{m (mass)}{ v (volume)}[/tex]. Moreover, in this case, it is known the mass is 37.28 g, but the volume is not directly provided. However, we know the water in the graduated cylinder had a volume of 20.0 mL and this increased to 34.0 mL when the chunk of metal is added, this means the volume of the metal is 14 mL (34.0 mL - 20.0 mL = 14 mL). Now let's calculate the density:

[tex]P =[/tex] [tex]\frac{37.28g}{14.0mL}[/tex]

[tex]P = 2.66 g/mL[/tex]

This means the density of this metal is 2.66 g/mL, which can be rounded as 2. 7 g/mL, and according to the chart, this is the density of aluminum. Therefore, this material of this chunk is aluminum.

Answer:

See explanation

Explanation:

Sr(s) + 2HCl(aq) -----> SrCl2(aq) + H2(g)

Ionically;

Sr(s) + 2Cl^-(aq) ----> SrCl2(aq)

If we look at the reaction above, strontium atom was dissolved in hydrochloric acid. The strontium atom is now oxidized by the acid to give Sr^2+ ion according to the equation shown above.

Answer: B

Explanation: to have a control, and many samples to investigate and cover the differences and anseretics.

In a survey that asked about alcohol use in high school students , the important measure for controlling bias is "Getting a random sample from all grade levels".

A chemical compound is found in alcoholic beverages like beer, wine, as well as liquor. Several medicines, mouthwashes, home items, as well as essential oils contain it.

In a survey that asked about alcohol use in high school students , the important measure for controlling bias is "Getting a random sample from all grade levels".

Therefore, the correct answer will be option (B).

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Answer:

its C

Explanation:

Cloud electron is a part of an atom is mostly empty space. Hence option D is correct.

It is the smallest unit of matter that possess the properties of the chemical element. It can’t be an independently, they form ions and molecules they both are combine and form large numbers of matters.

Every solid, liquid, gas, and plasma are composed of neutral or ionized atoms.

Atoms are basically three types: Neutrons, protons and electrons. In atoms there are two regions:

Electron clouds: Most of the volume of an atom.

The region where the electrons can be found (mostly empty space). Cloud electron is a part of an atom is mostly empty space. Hence option D is correct.

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Answer:

Ionization energy is a measure of the difficulty involved in  removing an electron from an atom or ion or the tendency of an atom or ion to surrender an electron.

Explanation:

Answer:

This is the energy required to remove a valence electron from an atom of the element to form an ion.Generally,there is a tendency for ionization energies to increase across a period and decrease down a group....

Answer:

I guess carbon

Explanation:

Answer:

A drug administered at a rate of 13.5 cL/hour has a rate in μL/s of 37.5 μL/s

Explanation:

The given rate at which the blood is administered  = 13.5 cL/hour

The rate at which the question asked to be administered = μL/s

The conversion factor between cL and μL is given as follows;

1 cL = 10,000 μL

Which gives;

13.5 cL/hour × 10,000 μL/cL × 1 hour/(60 × 60 seconds) = 37.5 μL/s

Therefore, a drug administered at a rate of 13.5 cL/hour has an administration rate of 37.5 μL/s.

Answer:

The cell potential is 0.0296V

Explanation:

Please see the attachment below

We sense "ghosts" that aren't there because of our heightened state of anxiety, our incapacity to discern nighttime stimuli effectively, our belief that bad entities should favor the dark, and our relative lack of nighttime experience.

The correct option is (B) This time of day produces more dramatic footage.

In ghost stories, ghosts frequently manifest at night for a variety of reasons:

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Answer:

removes the fertile B horizon of soil

Explanation:

Wind erosion has the capacity to remove the fertile B horizon of the soil.

The term wind erosion generally refers to the capacity of high-magnitude wind to cause damages to the terrestrial environment. Soils can get their topmost layers removed by a strong wind if there are no barriers such as vegetation to break the speed of the wind.

The topmost layers in most cases consist of humus and the fertile minerals from parent materials. When the topmost layer is lost, the soil becomes unproductive for agriculture.

Answer:

Mass of liquid ammonia is 0.035g.

Explanation:

I hope this will help u

Have a nice day

Answer:

The mass of iron shot is 28.3 grams.

Explanation:

Given that the initial volume of water is 47.5 mL and final volume of water containing iron shot is 51.1mL. First, you have to find the volume of iron shot by subtracting :

[tex]47.5 + iron \: shot = 51.1[/tex]

[tex]iron \: shot = 51.1 - 47.5[/tex]

[tex]iron \: shot = 3.6ml[/tex]

Next, we have to apply density formula, D = mass/volume :

[tex]d = \frac{m}{v} [/tex]

[tex]let \: d = 7.87,v = 3.6[/tex]

[tex]7.87 = \frac{m}{3.6} [/tex]

[tex]m = 7.87 \times 3.6[/tex]

[tex]m = 28.3g \: (3sf)[/tex]

Answer:0.2496m³/day

Explanation:

Answer:

Precise, but not accurate

Explanation:

First, let’s define accuracy and precision.

⇒Accuracy: how close you are to the actual value

⇒Precision: how close the measurements are to each other.

Let’s examine the data given:  

12.13 g, 12.12 g, 12.13 g, and 12.11 g

Each number is or is very close to 12.12 (within 0.1)

The actual mass of the object is 17.13 grams. Each measurement is about 5 grams away from the actual mass.

Since the measurements are very close to each other, but quite far from the true value, we can say the results are precise, but not accurate.

Answer: How The World Works

Explanation: Our world is made out of atoms, molecules and ions. Their behavior determines the properties of the substances we encounter in our daily lives: their structure, color, smell, and the way they interact with each other.

Answer:

Yes, bikes with larger tires help you go faster.

B: if a person rides a bike with larger tires ,then the person with move faster than on a bike with smaller tires

Explanation:

Bikes with larger wheels cover more distances in one revolution, when compared to bikes with a much smaller wheel, if the wheels are turning at the same revolution per minutes. Although more effort is put into turning a big wheel, when compared to that for a smaller wheel, but it will go faster if you can keep it spinning at the same rate as a small one.

Answer:

The correct answer is : 44 dollars.

Explanation:

A quarter is one fourth of a dollar that is the reason it is known as quarter. A quarter is 25 cents or 0.25 dollar in value. If Matthew has 176 quarters in his jar than the value of the total coins would be:

1 quarter = 0.25 dollar

1 quarter = 1/4 dollar.

4 quarter = 1 dollar

then, 176 / 4 = x dollar

 = 44 dollar

Thus, The correct answer is : 44 dollars.

Answer: kindly check explanation

Explanation:

Characteristics of scientific thinking and investivating:

1) Empiricism : Also called empirical evidence maybe classed as natural evidences used to butress or support a certain notion or fact usually attainable from experience or teaching.

11.) Rational : Rational thinking or attribute could simply be tagged as reasonable and do not negate laid down facts.

111.) Skepticism: This is very imperative in scientific research as it opens the way to further research enabling researchers to gather more evidences required to establish a strong argument.

2.) IMPORTANCE OF SCIENCE LITERACY

Science literacy simply empowers mankind. Nourishing researchers or literates with the knowledge of its natural environment and enabling them understand, explore and exploit resources in our environment.

3.) Skills and tools scientist need :

Skills :

1) Curiosity: The ability to frame and and ask questions is key to establishing a purpose for research. Asking the right questions is key in a scientific process.

11) Data gathering or collection: Obtaining the right data capable of proferring the essential solution to our research question is key to obtaining logical insight.

111) Communication: Once research is complete, it is essential that researchers possess the skills required in transmitting their conclusion in a way which is both simple, logical and sensible.

Tools include common laboratory equipments such as beaker, testube, measuring cylinders, microscope and so on.

4.) The scientific or inquiry method provides a stepwise, easy to understand and logical approach to problem solving, Hence, providing a lucid and evidence - based conclusion which is both practicable and reproducible.

5.) The main reason for the modification of scientific theories is that they are susceptible to further research or study. As a result of evolution and change in trend depending on various natural and environmental factors, modification may occur in the form of review without abrogating previously existing studies.

6.) Science and technology has enabled mankind to adjust and cope with the continuous evolutionary changes in our environment. Enabling us to use these findings to ease our everyday living standard.

Answer:

85.6 °C

Explanation:

Precision in scientific measurements refers to how close together the results of a repeated scientific measurement is. In this particular case where the melting point of fluorenone is being determined, precision refers to how close together the values from repeated measurements of the melting point of fluorenone is.

If we look at the values, the only one that is not close to others is 85.6 °C. Hence, if we remove this particular value, the data can be regarded as being precise.

Answer:

its C

Explanation:

how i know is did it on a piece of paper and got C for the answer. Have a nice day!

Answer:

1970

Explanation:

 1970, Canada gradually began to convert from an imperial to a metric system of measurement

Answer:

1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Explanation:

From the question given above, the following were obtained:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Volume of solution = 20.4 mL

Concentration of solution =?

Next, we shall determine the mass of sodium hydroxide, NaOH. This can be obtained as as illustrated below:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Mass of NaOH =?

Mass of NaOH = (Mass Cylinder + NaOH) – (Mass of empty cylinder)

Mass of NaOH = 31.92 – 9.5

Mass of NaOH = 22.42 g

Finally, we shall determine concentration of the solution as follow:

Mass of NaOH = 22.42 g

Volume of solution = 20.4 mL

Concentration of solution =?

Concentration = mass /volume

Concentration of solution = 22.42 / 20.4

Concentration of solution = 1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Therefore, the concentration of the solution is 1.1 gmL¯¹

Answer:

Water

Explanation:

Because it has a higher specific heat capacity.

Water is a better coolant than methanol due to its high specific heat capacity.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

Methanol effective in preventing the coolant from freezing, its low boiling point and low specific heat capacity led to considerably less cooling than water alone. Also, the concentration of methanol would tend to be reduced over time due to its greater tendency to evaporate than the water with which it was mixed.

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Answer:

1.73913043g/mL

Explanation:

Density is how much a substance would weigh per 1 mL of the substance. So it is measured by dividing weight (g) by volume (mL).

4.80g/2.76mL = 1.73913043g/mL

Answer:

Keq = 79365

Explanation:

Based on the reaction of sulphur dioxide, SO2, with O2, to produce SO3:

2SO2 + O2 ⇄ 2SO3

The equilibrium constant of reaction (Defined as the ratio of concentrations of products over reactants powered to the coefficient of each reactant). For the reaction:

Keq = [SO3]² / [SO2]² [O2]

Replacing with concentrations of the problem:

Keq = [5.0x10⁻²]² / [3.0x10⁻³]² [3.5x10⁻³]

Explanation:

Over 99.9% percent of an atom's mass resides in the nucleus. The protons and neutrons in the center of the atom are about 2000 times heavier than the electrons orbiting around it.

Because the electrons are so light by comparison,they represent only a tiny fraction of a percent of the atom's total weight.

Hope this answer helps you!

Answer:

The average yearly rate of change of carbon-14 during the first 5000 years = 0.0004538 grams per year

Explanation:

Given that the mass of the carbon 14 at the start = 5 gram

At the end of 5,000 years we will have;

[tex]A = A_0 \times e^{-\lambda \times t}[/tex]

Where

A = The amount of carbon 14 left

A₀ = The starting amount of carbon 14

e = Constant = 2.71828

[tex]T_{1/2}[/tex] = The half life

[tex]\lambda = 0.693/T_{1/2}[/tex]

t = The time elapsed = 5000 years

λ = 0.693/[tex]T_{1/2}[/tex] = 0.693/5730 = 0.0001209424

Therefore;

A = 5 × e^(-0.0001209424×5000) = 2.7312 grams

Therefore, the amount of carbon 14 decayed in the 5000 years is the difference in mass between the starting amount and the amount left

The amount of carbon 14 decayed = 5 - 2.7312 = 2.2688 grams

The average yearly rate of change of carbon-14 during the first 5000 years  is therefore;

2.2688 grams/(5000 years) = 0.0004538 grams per year

The average yearly rate of change of carbon-14 during the first 5000 years = 0.0004538 grams per year.

Answer:

The pendulum would accelerate to the left

Explanation:

hope this helps

Answer:

Explanation:

The significant figures are determined by 2.0. It only has 2 places, so the answer to the last question is 2.

The English unit is 67.6 oz

The metric unit is 2 L

So there are 67.6 fl oz / 2 L = 33.8 fl oz / L

In other words 1 liter has 33.8 fl oz

But you only have 2 sig digs so the answer is actually 34 fl oz/L

Answer:

option A is correct

Explanation:

argon belongs to noble gas which doesnt form any type of chemical bond

The number of bonds that will argon group will form is zero, as it already have octet configuration.

Nobles gases are the most stable gases present in the periodic table and electronic configuration of valence shell of these gases are always complete or stable i.e. 2 or 8.

Argon is a noble gas, whose atomic number is 18 and valence shell has 8 electrons. As we know that atoms will take participate in bond fomation to get the stable state and fulfilled valency, so argon will not form any bond as it is already in stable state.

Hence argon will form zero bonds.

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