Calculate the density of the football. Use the formula D = m/V where D is the density, m is the mass, and V is the volume. Record your calculations in Table B of your Student Guide. What is the density of the football while it is deflated? g/cm3

Answer:

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass = 17.2 g

volume = 5 cm³

We have

[tex]density = \frac{17.2}{5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Its A

Explanation:

Green, blue, indigo lists three parts of sunlight that make up some of the visible spectrum. Hence option with green, blue, indigo is correct.

Electromagnetic spectrum is nothing but the range of wavelengths or frequencies on which electromagnetic radiation extend. it is whole distribution of electromagnetic waves according to frequency or wavelength. Electromagnetic wave is nothing but a photon which carries energy. Photon has frequency, wavelength as well as amplitude.

Electromagnetic spectrum is show in figure.

Range from 4000 angstrom to 7000 angstrom from violet to red respectively shows the visible light

Infrared light is nothing but the heat we feel from the sun. and ultraviolet light is blacked by ozone layer. we can calculate exact value of temperature of the sun rom Stephan's forth power law.

Green, blue, indigo, red and oranges are the colors from visible light, therefore they are part of visible light.

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Answer:

electron geometry

Tetrahedral for N F 3

Arrangement of bonding and non-bonding electron domains

molecular geometry

Trigonal pyramidal for N F 3

Arrangement of only the atoms in a molecule

Explanation:

According to valence shell electron pair repulsion theory, the shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.

The electron pair geometry refers to the arrangement of bonding and non-bonding electron domains. For NF3, the electron geometry is tetrahedral.

The molecular geometry refers to the arrangement of only the atoms in a molecule. For NF3, the molecular geometry is trigonal pyramidal.

NF₃ has different geometry as per the arrangements of electrons. Tetrahedral and Trigonal bipryamidal are the two geometries.

The shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.

Electron geometry

Tetrahedral for NF₃

Arrangement of bonding and non-bonding electron domains

Molecular geometry

Trigonal pyramidal for NF₃

Arrangement of only the atoms in a molecule

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Answer:

The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.

Answer:

bubbled

Explanation:

its simple they bubbled

signs of chemical reactions are change of

odor

bubbles

solid turns liquid

liquid turns solid

change of color

Answer:

A.endoplamic reticulum

Explanation:

The endoplamic reticulum  is an important organelle in protein synthesis. The nucleus contains DNA, which is the template for transcription of mRNA. mRNA acts as a message, which leaves the nucleus to become translated into proteins.

The endoplasmic reticulum is important in the synthesis, folding, and modification of proteins.  

Answer:

0.000305 km

Explanation:

1 foot = 0.000305 kilometers

Answer:

[\tex]\huge\bold\red{brainiest answer}[/tex]1 km =3,280.8398950131foot

Answer:

Zinc weighs 65.38 grams per mole, so we’ve got 0.994 moles of zinc (I’ll worry about sig figs at the end). HCl weighs 36.46 grams per mile, so we’ve got 1.78 moles of HCl. However, two moles of HCl react with one mole of zinc. So only 1.78/2 = 0.890 moles of Zinc are going to react.

One mole of zinc produces one mole of hydrogen, which weigh 2.02 grams per mole. So 0.890 moles * 2.02 grams/mole means 1.90 grams of hydrogen will be produced.

Since we have 2 sig figs in the weights given, the answer should have 2 sig figs, thus 1.9 grams.

This is just an example

Answer:

46%

Explanation:

When solving this problem we have to note that the amount of salt (in grams) before isolation and after isolation are equal. If [tex]V_1[/tex] represents its volume before isolation and [tex]V_2[/tex] its volume after isolation then:

[tex]2.1 \frac{g}{L} *V_1=3.89\frac{g}{L} *V_2\\\\\frac{V_2}{V_1} =\frac{2.1}{3.89}\\\\\frac{V_2}{V_1} =0.54\\\\This\ means\ after \ isolation\ the\ volume\ of water\ is\ 54\%\ of\ its\ original\ value.\\\\The\ amount\ of\ evaporation=1-\frac{V_2}{V_1} =1-0.54=0.46=46\%\\\\The\ amount\ of\ evaporation=46\%[/tex]

Answer:

DE

Explanation:

BC has a constant speed of 0, and DE does not have a consistent slope, therefore the speed is changing

The speed is defined as the rate of change of distance with respect to time.

In interval DE , speed of the object is changing.

Since, speed is defined as the rate of change of distance with respect to time.

   [tex]v=\frac{dx}{dt}[/tex]  , where x represent distance.

Slope of given graph represent distance, In interval BC slope is constant.

In interval, DE slope is always changing at each point.

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Answer:

alkali metals- Group 1

Explanation:

they have less valence electrons and therefore are more reactive

Answer:

On a warm day, water absorbs from its warmer environment, lowering the air tempurature. On a cool night, heat is transferred from the water to its cooler environment, raising the air tempura

Explanation:

Answer:

batteries

Explanation:

bc they're powered by energy

195 g×

1 mol

Ni(OH)

2

92.71

g Ni(OH)

2

×

6.022×

10

23

formula units

mol

=1.27×

10

24

formula units of Ni(OH)

2

Since there are  

5

atoms—one  

Ni

atom, two atoms of  

O

and two atoms of  

H

—in each formula unit of  

Ni(OH)

2

,

we multiply the number of formula units calculated above by  

5

:

1.27×

10

24

formula units of Ni(OH)

2

×

5 atoms

formula unit of Ni(OH)

2

=6.33× 10^ 24  total atoms  

The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex]  is[tex]6.30\times 10^{24}[/tex] atoms

Explanation:

Given:

The 195 grams of nickel(II) hydroxide,[tex]Ni(OH)_2[/tex] .

To find:

The total number of atoms in 105 grams of nickel(II) hydroxide.

Solution:

The mass of nickel(II) hydroxide = 195 g

The molar mass of nickel(II) hydroxide = 92.708 g/mol

The moles of nickel(II) hydroxide:

[tex]=\frac{195 g}{92.708 g/mol}=2.10 mol[/tex]

According to the mole concept:

1 mole =[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex]

The number of molecules of nickel(II) hydroxide =

[tex]N=2.10 mol\times 6.022\times 10^{23} mol^{-1} =1.26\times 10^{24} molecules[/tex]

In 1 molecule of nickel(II) hydroxide there is 1 nickel atom, then in N molecules of nickel(II) hydroxide:

[tex]=1\times 1.26\times 10^{24} atom=1.26\times 10^{24} atoms[/tex]

In 1 molecule of nickel(II) hydroxide there are 2 oxygen atoms, then in N molecules of nickel(II) hydroxide:

[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]

In 1 molecule of nickel(II) hydroxide there are 2 hydrogen atoms, then in N molecules of nickel(II) hydroxide:

[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]

The total number of atoms:

[tex]=1.26\times 10^{24} atoms+2.52\times 10^{24} atoms+2.52\times 10^{24} atoms=6.30\times 10^{24} atoms[/tex]

The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex]  is[tex]6.30\times 10^{24}[/tex] atoms.

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Answer:

λ = 5.56 × 10⁻³ m

Explanation:

You have to use the formula c = λv to solve the problem.  Review what you are given.  You are given v and c, where v = 5.40 × 10¹⁰ Hz and c = 3.00 × 10⁸ m/s.  The value c is for the speed of light and is something you need to memorize.  You will use it often in physics and sometimes in chemistry.

Now that you figured out what you know, you can see that there is only one unknown, allowing you to solve.

c = λv

λ = c/v

λ = (3.00 × 10⁸ m/s)/(5.40 × 10¹⁰ Hz)

λ = 5.56 × 10⁻³ m

According to the electronic configuration of boron, there are three electrons in the Bohr model of a boron atom.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistence to disease, lowering growth rates, and affecting fish egg and larvae development.

Explanation:

Answer:

"Sediment increases the cost of treating drinking water and can result in odor and taste problems. Sediment can clog fish gills, reducing resistance to disease, lowering growth rates, and affecting fish egg and larvae development".

Explanation:

Answer:

268.3 m/sec

Explanation:

Answer:

[tex]Cl^-[/tex]

Explanation:

Hello.

In this case, when chlorine gets ionized by gaining one electron it goes:

[tex]Cl^-[/tex]

Whose electron configuration is the same as argon:

[tex]Cl^-=Ar:1s^2,2s^2,2p^2,3s^2,3p^6[/tex]

Since the both of them have 18 electrons, they become isoelectric with the same neutral charge.

Best regards.

Answer:

Magnesium loses it's two electrons and Oxygen gains two electrons. Magnesium is now a cation and Oxygen is now an anion. Both become stable.

Explanation:

The type of electron transfer which happens between the Mg and O atom is a complete transfer of electrons from the Mg atom to the O atom in an ionic bond.

The most electropositive electron usually is usually the donor while the most electronegative elements is the acceptor.

As evident in the case above;

Ultimately, an ionic bond is formed between the Mg and O atoms.

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Answer:

Pressures and temperatures

Explanation:

In deciding the new substances that develop in a metamorphic stone, pressures and temperatures are major factors. Under various conditions of pressure and temperature, various minerals form.

Metamorphic rocks are classified that, extreme heat and strain, have altered shape. Metamorphic derives from the terms meta and morph in german. Meta means alteration and morph means shape. So, to alter shape, we get metamorphosed significance.

Answer:

110.91 g of CaCl2

Explanation:

11.9 grams of CaCl₂ is required to make 1 Liter of 0.1M solution.

We first need to calculate the molecular weight of calcium chloride CaCl₂.

The atomic weight of Ca = 40.01

and the atomic weight of Cl₂ = 2×35.45 = 70.90

So, the molecular weight of CaCl₂ = 40.01 + 70.90 = 110.91

This means that 110.91 g of CaCl₂ mixed with enough water will produce 1Liter of 1M solution.

Now, to calculate the amount of CaCl₂ required to make 1 Liter of 0.1M solution we use:

grams of chemical = (molarity of solution in mole/liter) x (MW of chemical in g/mole) x (ml of solution) ÷ 1000 ml/liter

= 0.1 × 110.91 × 1000 ÷ 1000

= 11.09 grams

So, 11.09 grams of CaCl₂ will be used.

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Answer:

Control group

Answer:

Explanation:

Given that:

P₅₀ = 20 torr in muscle

The partial pressure of O2 in lungs Po₂ = 100 torr

The hill coefficient [tex]n_h[/tex] = 3

According to the Hill coefficient;

[tex]\dfrac{\Upsilon}{1-\Upsilon}= (\dfrac{PO_2}{P_{50}})^n[/tex]

here;

[tex]\Upsilon[/tex] = fraction of haemoglobin monomers

[tex]\dfrac{\Upsilon}{1-\Upsilon}= (\dfrac{100}{20})^3[/tex]

[tex]\dfrac{\Upsilon}{1-\Upsilon}[/tex] = 125 θ lungs

However for θ muscle :

[tex](\dfrac{PO_2}{P_{50}})^n=( \dfrac{20}{20})^3[/tex]

= 125 (θ lungs) - 1 (θ muscle)

= 124

B.

if nh =1

[tex]\mathtt {\theta \ lungs} = \dfrac{\Upsilon}{1-\Upsilon}= (\dfrac{100}{20})^1[/tex]

[tex]\mathtt {\theta \ lungs} =5[/tex]

[tex]\mathtt {\theta \ muscle} = \dfrac{20}{20}^1[/tex]

(θ muscle) = 1

(θ lungs) - (θ muscle) = 5 - 1

(θ lungs) - (θ muscle) = 4

A) The efficiency of hemoglobin at O₂ delivery = 124

B) Efficiency of O₂ delivery will change by : 4  

Given data:

Partial pressure of O₂ in lungs ( PO₂ )  = 100 torr

Partial pressure of O₂ in muscle  = ( P₅₀ ) = 20 torr

Hill coefficient nh = 3

r = fraction of hemoglobin monomers

A) Determine the efficiency of hemoglobin at O₂ delivery

Given that Hill coefficient = [tex]\frac{r}{1-r} = (\frac{PO_{2} }{P_{50} } )^{n}[/tex]  

                                          = [tex]\frac{r}{1-r} = (\frac{100}{20})^{3}[/tex]  = 125 ∅ Lungs

For Muscle :

[tex](\frac{20}{20} )^{3}[/tex] =  1 ∅ muscle

Therefore the efficiency of hemoglobin at 0₂ delivery

= ( ∅ lungs - ∅ muscle )

=  ( 125 - 1 )  = 124

B )  Determine the change in efficiency of O2 delivery

when hill coefficient ( nh ) = 1

for lungs :

[tex]\frac{r}{1-r} = (\frac{100}{20})^{1}[/tex]  = 5

for muscle :

[tex](\frac{20}{20} )^{1}[/tex]   = 1

Therefore change on efficiency =  ( 5 - 1 ) = 4

Hence we can conclude that The efficiency of hemoglobin at O₂ delivery = 124 and Efficiency of O₂ delivery will change by  4  

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Answer:

An increase in the concentration of the reactant in solution causes the reaction rate to increase exponentially - first order

The reaction rate increases in direct proportion to the concentration of the reactant in solution -second order

The reaction rate is constant regardless of the amount of reactant in solution - zero order

Explanation:

The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. The order of reaction is determined experimentally and not necessarily by inspection.

Typically, in a second order reaction, the rate of reaction increases in proportion to increase in concentration.

For a first order reaction, the rate of reaction increases exponentially as the increase in concentration.

For a zero order reaction, the rate of reaction is independent of the concentration of the reactant.

Answer:

Option C is correct = ₈₅At²²⁰

Explanation:

Given radioactive decay shows the beta emission.

²²⁰₈₄Po    ₈₅At²²⁰  +  ⁰₋₁e ⁻

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

Properties of beta radiations:

1) They can travel in air in few meter distance.

2) These radiations can penetrate into the human skin.

3) The mass of beta particle is smaller than the alpha particles.

4) The sheet of aluminium is used to block the beta radiation

¹⁴₆C → ¹⁴₇N + ⁰₋₁e ⁻

The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.

Explanation:

Label A: oceanic - oceanic

Label B: oceanic - continental

Label C: continental - continental

Answer:

Oceanic-continental convergence---- letter B.  

Oceanic-oceanic convergence ---- letter A.

Continental-continental convergence ---- letter C

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