Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and 20 tiles with the original wax brand. After one week he counts the number of scratches on the floor

The number of atoms per square centimeter in silicon

in the (100) = [tex]6.78[/tex] ×[tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]

in the (110) = [tex]9.59[/tex] ×[tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]

in the (111)  = [tex]7.83[/tex] × [tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]

With the symbol Si and atomic number 14, silicon is a chemical element. It is a tetravalent metalloid and semiconductor that is crystalline, rigid, and brittle with a blue-gray metallic sheen. With carbon above it and germanium, tin, lead, and flerovium below it on the periodic table, it belongs to group 14. It rarely reacts, if at all.

Jöns Jakob Berzelius was able to prepare and characterize it for the first time in 1823, but this was delayed due to its high chemical affinity for oxygen. Silicates are a class of anions made up of its oxides. The only metalloid and nonmetal with melting and boiling points higher than its respective values of 1414 °C and 3265 °C is boron.

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At medium temperatures, between 50 and 68 degrees Fahrenheit, or

10 and 20 degrees Celsius, the photosynthetic enzymes work at their

optimum levels, so photosynthesis rates gauge high.

The photosynthetic enzymes typically operate at their best levels between 50 and 68 degrees Fahrenheit, and any significant departure from this range would slow down photosynthesis.

Despite an increase in the rate of carbon dioxide absorption into leaves at temperatures above 68 degrees Fahrenheit (20 degrees Celsius), the rate of photosynthesis decreases at these temperatures because the enzymes are less effective.

The shape and functionality of the photosynthetic enzymes are lost at temperatures above 104 degrees Fahrenheit (40 degrees Celsius), and the photosynthetic rate rapidly decreases.

Due to the ineffectiveness of the photosynthetic enzymes at low temperatures, specifically between 32 and 50 degrees Fahrenheit (0 and 10 degrees Celsius), the rate of photosynthetic reaction decreases.

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When the temperature is moderate (between 50 and 68 degrees Fahrenheit), the photosynthetic enzymes function at their peak between 10 and 20 degrees and the photosynthesis rates measure at their highest points.

As a result of the cells having to work harder to maintain a greater temperature, the amount of oxygen the cells require to function is also higher.

The temperature has an impact on photosynthesis's rate.

Photosynthesis occurs more quickly at higher temperatures. This is because the majority of chemical reactions are sped up by temperature and photosynthesis is a chemical reaction.

At 25C, oxygen synthesis is greatest. When the temperature is excessively high or low, oxygen generation decreases.

The negative connection between dissolved oxygen and temperature results in lower concentrations of dissolved oxygen.

Reduced dissolved oxygen levels occur as water temperature rises.

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Answer:

It is true.

Explanation:

Its a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero

The correct order that depicts the process of photosynthesis would be carbon dioxide + water ---> glucose (chemical energy) + oxygen.

Photosynthesis is a biological process whereby green plants are able to make use of solar radiation to convert inorganic substances in the form of water and carbon dioxide to carbohydrates.

In addition to carbohydrates, oxygen gas is produced as a by-product of the process. The process happens through a series of chemical reactions. Some reactions require light while some do not.

The entire process is summarised by the following equation:

[tex]6CO_2 + 6H_2O --- > C_6H_1_2O_6 + 6O_2[/tex]

The equation can be rewritten in word form as:

carbon dioxide + water ---> glucose (chemical energy) + oxygen

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Using the density, the mass of sulfuric acid is 2292.82 grams.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

ρ = 1.31 g/mL

V = 1 gallon = 4546.09 mL

% sulfuric acid = 38.5%

By substituting the following parameters, we get total mass

ρ = m / V

m = ρ .V

m = 1.31 . 4546.09

m = 5955.38 grams

Find the sulfuric acid mass

ms = %sulfuric acid x m

ms = 38.5% x 5955.38

ms = 2292.82 grams

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As per given statement as follows:-

generally, independent variables are the one manipulated by investigators and study effects. Dependent variables are the measurements and observation by the data collected.

Experimental group are the participants exposed to the  independent variable and control group the participants treated same as experimental group but not  exposed to independent variables.

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The surface area of a square piece of paper has an edge measuring 7.06cm is 49.84 cm2

The surface area of an object is the total area of the object that it occupies. It can be measured by adding all the sides of the object.

The surface area of a square is

side x side

Given the sides of the square is 7.06 cm.

This is a square, so all squares have the same size sides. So by putting the values in the equation, we can occupy the surface area of the square.

7.06 x 7.06 = 49.84

Therefore, the surface area of a square piece of paper is 49.84 cm2

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Answer:

1g/

Explanation:

density=mass÷volume

5g÷5ml

1g/m

The total solids is 300 mg/L, volatile solids is 80 mg/L, total suspended solids is 224 mg/L, total dissolved solids is 76 mg/L and the volatile suspended solids is 26.66 mg/L

The data we have is

Mass of evaporating dish, Mtare = 24.1520 g

sample volume V = 150 ml

As per the question

a) Total solids = All the solids present whether suspended or dissolved

= [(Mtare+solids - Mtare) x 1000mg x 1000ml ] / V

= [24.1970 - 24.1520] x 10^(6) / 150

= 300 mg/L

b) Volatile solids = portion of solids which are volatized at 550 C

= [(Mtare+solids - Mtare+ash)] x 10^(6) / V

= 24.1970-24.1850 x 10^(6) / 150

= 80 mg/L

c) Total suspended solids = solids that are non-filterable with specified filters and are not volatilized at 105 C

= [Msus solids+ tare +filter - Mtare+filter x 10^(6)] / V

= 1.4939 - 1.4603 x 10^6 / 150

= 224 mg/L

d) Volatile suspended solids = portion of suspended solids which are volatilized at 550C

= Mss+Tare+filter - Mresidue+Tare+filter x 10^(6) / V

= [1.4939 - 1.4899 x 10^(6)] / 150

= 26.66 mg/L

e) Total dissolved solids = solids which are present in solution and filterable

=(Total solids - total suspended solids)

= (300 - 224)

= 76 mg/L

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The volume of the object is 8 cm³ and the density of the object is 3 g/cm³.

Archimedes' principle states when an object is partially or fully immersed in a fluid, it displaces the portion of the fluid equal to its own weight.

The volume of the object = volume of the water in the cylinder displaced

volume of the object = 30 cm³ - 22 cm³

volume of the object = 8 cm³

The density of the object is calculated from the ratio of the mass and volume of the object.

density = mass/volume

density of the object = 24 g / 8 cm³

density of the object = 3 g/cm³

Thus, the volume of the object is 8 cm³ and the density of the object is 3 g/cm³.

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Answer:

1 dollar

Explanation:

The components of substances that are ionically bonded separate when the substance is placed in water.

Water is an excellent solvent due to its polarity and its ability to for the hydrogen bonds. Because of this property, different substances dissolves and get separated in the water which are ionically bonded.

Ionically bonded compounds separates in the water because the molecules of water hydrate the ions. To separate an ionically bonded compound, the water molecules should be able to stabilize the ions. This stability results from breaking the ionic bonds. They do this by hydrating the ions.

Water is a polar molecule and has a permanent dipole moment. The oxygen atom has a partial negative charge and the hydrogen atoms have a partial positive charge. The water molecules attracts the positive and negative ions, when an ionic substance is placed in water.

The positive ions have several water molecules around them, and oxygen atoms are close to the positive ion. The negative ions have several water molecules around them, and hydrogen atoms are close to the negative ion.

The water molecules reduces attractions between the ions resulting in the weakening of ionic bond which results in the hydration of ions.

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The atomic radius of Magnesium (mg) that has an hcp crystal structure, a c/a ratio of 1. 624, and a density of 1. 74 g/cm3 is1.6×〖10〗^(-8) cm.

The number of atoms that are present in each unit cell of a specific hexagonally closed-packed crystal with six atoms is known as hexagonal closed packing, or HPC. It is written as

ρ=(n×A)/(V_c×N_A )

Where

ρ is the density

n is the number of atoms

N_A is Avogadro’s constant (6.023×〖10〗^23 atoms/mol)

A is the molar mass of magnesium (24,305g/mol)

V_c is the volume of the crystal

V_c   can be calculated using the expression below

V_c=(a^2 c×3√3)/2

a is the short crystal dimension (2R)

c is the long crystal dimension

1.624=c/a

c=1.624a

Putting the values in the above equation

V_c=(a^2×1.624a×3√3)/2

V_c=((2R)^2×1.624(2R)×3√3)/2

V_c=(4R^2×3.248R×3(1.73))/2

V_c=(67.428R^3)/2

V_c=33.71R^3  〖cm〗^3/(unit cell)

Substituting values into the density equation

ρ=(n×A)/(V_c×N_A )

1.74=(6×24.305)/(33.71R^3×6.023×〖10〗^23 )

Making R the subject of formula

R^3=145.83/(1.74×33.71×6.023×〖10〗^23 )

R^3=145.83/(3.53×〖10〗^25 )

R^3=4.127×〖10〗^(-24)

R=∛(4.127×〖10〗^(-24) )

R=1.6×〖10〗^(-8) cm

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Yes,  the pelvic bone support the intestines.

The pelvis, also known as the bony pelvis or the pelvic girdle, is a complex of bones that connects the trunk to the legs, supports and balances the trunk, and houses and supports the intestines, urinary bladder, and internal sex organs. It is also known as the "basin" or "bony pelvis" in human anatomy.

Major organs are located in the pelvic region, hidden by layers of muscles. The primary digestive organs, the intestines, are some of the most crucial. Bloating, constipation, or diarrhea, which are IBS symptoms, can cause pressure and pain in the pelvic area.

Therefore, yes the pelvic bone support the intestines.

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Answer:

This question is to vague. PS: what are you talking about?

Explanation:

This question is to vague. PS: what are you talking about?

a)Elements that form hydrides by electrovalent binding are Sodium(Na), and Magnesium (Mg).

b)None of the elements is used to catalyze a chemical reaction and the elements that catalyze the reaction are platinum, cobalt, and iron.

c)Elements used in are radioactive dating  [tex]C^{14}[/tex]

d)The element which forms acid anhydride is phosphorous (P).

e)The element that exhibits both metallic and non-metallic behavior is Metalloids.

The tabular display of chemical elements is the periodic table, Which contains 18 periods and 7 groups.

All the elements are configurable in the S, P, D, and F blocks.

S and D block elements mostly contain metals, and P- block contains non-metals and Metalloids.

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Answer: 3

Nucleon number is 31

Explanation:

Answer:

Ice: solid and rigid. Water: Liquid and sloshy Gas: light and not dense.

Explanation:

Up ^

The vapor pressure of the solution in question 3 at this temperature is

[tex]6.72[/tex] ×[tex]10^{-3}[/tex] torr.

The pressure that a vapor exerts on its condensed phases (solid or liquid) in a closed system at a specific temperature is referred to as the equilibrium vapor pressure (or vapour pressure in English-speaking nations other than the US; see spelling variations).

An indicator of a liquid's evaporation rate is the equilibrium vapor pressure. It has to do with how easily liquid-borne particles tend to elude detection (or a solid). Volatile is a term used to describe a chemical that, at room temperature, has a high vapor pressure.

Vapor pressure is the force that a vapor cloud exerts over a liquid surface. The kinetic energy of a liquid's molecules rises as its temperature climbs.

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Hi Steven!

So yet again, we find ourselves doing math when we thought the class was chemistry!  For this we're going to do a standard conversion that we do a lot in GenChem, converting from grams to moles.

In this case, we're starting with 0.171g N2O.  Let's go ahead and convert that to moles by using the molar mass, which is 44.013 g/mol.

.171 g N2O * (1 mol N2O / 44.013 g N2O) = 0.00389 mol N2O

So we got to moles of dinitrogen monoxide - now we need to know how many moles of nitrogen!  We see that there's a subscript of 2 after the N, meaning there are two moles of N for every mol of N2O.  You can think of it in terms of food -- for every 1 sandwich, there are two pieces of bread.

So let's multiply the number of moles of N2O by 2, to get moles of N!

.00389 mol N2O * ( 2 mol N / 1 mol N2O) = .00778 mol N!

Hope that helps :)

At 1 atmosphere and 20 degrees Celsius, all samples of H₂0(l) must have the same density.

The correct option is B.

The atmosphere of a globe or other celestial body refers to the layers of gases that surround it. Nitrogen makes up around 78% of the chemicals in the Earth's atmosphere, followed by oxygen at 21% and other gases at 1%.

It not only shields us from harmful UV solar radiation but also gives us the oxygen we need to survive. Without it, our planet could not sustain the pressure required for liquid water to exist on its surface. It also maintains the planet's temperature and the conditions necessary for life to exist.

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Models can show us specifically how atoms of a substance are arranged and connected on the atomic level.

Atomic models is defined as a graphic representation of the structure of an atom which shows that it contains a nucleus made up of proton and neutrons and has an electron revolving round around it.

The first scientist that proposed the description of the inner structures of an atom is William Thomson in 1900.

Other scientist that carries out works on the atomic structure to produce a model include the following:

Therefore, Models are important in makeup of substances on the atomic level because it can show us specifically how atoms of a substance are arranged and connected on the atomic level.

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Answer:

just be yourself , if they are a good person that you want to be your friend they would support you and care about what you have to say.

Explanation:

Explanation:

physical separation technique are based on physical properties of the substance

Answer:

Physical properties

Explanation:

Mixtures can be physically separated by using methods that use differences PHYSICAL PROPERTIES(boiling point, melting point, solubility in a given solvent,etc) to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

Answer:

Explanation:de

Melting (from solid to liquid), freezing (from liquid to solid), evaporation (from liquid to gas), and condensation are examples of matter transformations (changing from gas to a liquid).

Melting is the process by which a material transforms from its solid state into its liquid state. Freezing is the transition of a material from its liquid state into its solid state. Evaporation is the process by which a material transforms from its liquid state into its gaseous state. Melting is the process of converting a solid into a liquid. The melting point is the temperature at which a material transforms from a solid to a liquid. At 0 degrees Celsius, water melts.

Heat is applied in this pattern of solid to liquid to gas in order to cause the phase transition.

Condensation is the process by which a material transitions from its gaseous state into its liquid state. Sublimation is the process by which a solid transitions directly from its solid state to its gaseous state.

A physical transition from one state of matter to another, such as from solid to liquid or from liquid to gas, is referred to as a change of state, sometimes known as a phase change.

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