Jose is sweating after winning his 100-meter race.

Answer:

A liquid of unknown composition: Unknown liquid

A liquid of known composition: Known liquid

A solid-liquid mixture of unknown composition: Unknown solid-liquid mixture

A solid of known composition: Known solid

The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer:

3

Explanation:

If we want it to be rounded to one significant figure, it will be 3.

Answer:

C. 3.14

Explanation:

That's because pi is what mathematicians call an "infinite decimal" — after the decimal point, the digits go on forever and ever. When starting off in math, students are introduced to pi as a value of 3.14 or 3.14159. Though it is an irrational number, some use rational expressions to estimate pi, like 22/7 of 333/106

Answer:

12C and 16O

Explanation:

Here, we want to select which of the options are NMR inactive. For an isotope to be NMR inactive, then the net nuclear spin is zero.

What this means is that the number of proton present coupled with the number of neutrons are an even number pair.

What we are saying here is that the number of protons is an even number while the number of neutrons too is an even number. So the net nuclear spin in this case is zero.

in the case of oxygen, we have 8 protons and 8 neutrons. This makes the nuclear spin zero and consequently makes the isotope NMR inactive.

Same is in the case of carbon. There are 6 protons and 6 neutrons and this also makes nuclear spin zero .

In all the other isotopes in the question, we have odd number even number or even number odd number pairs of protons and neutrons.

Answer:

I can not see the file

Explanation:

The following balanced chemical equation may be used to describe the interaction between aluminum (Al) and calcium nitrate (Ca(NO₃)₂):

2 Al + 3 Ca(NO₃)₂ → 2 Al(NO₃)3 + 3 Ca

Reactants are the chemicals that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

The substances that initiate a chemical reaction. Products are the substances that are created during the reaction. Compounds or elements can act as reactants and products.

Aluminium and calcium nitrate interact in this reaction to form aluminium nitrate (Al(NO₃)₃) and calcium (Ca), which are the end products.

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Answer:

that's molecular

Molecular formula

The frictional force that acts on the body is shown as force D.

We know that the term friction has to do with the force that opposes the motion of a body along a surface. The magnitude of the frictional force is highly dependent on the nature of the surfaces that are in contact with each other.

In this case we have a free body diagram. The meaning of the Freebody diagram is a diagram that show all the forces that acts on a body. In this case, we can see that there are four forces that act on the body and they are the frictionl force, the moving force, the weight of the object and the normal reaction on the objject.

We can see that all the forces that are acting on the body have been labelled with a proper alphabet.

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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In order to calculate the amount of reactant needed to produce 500g of Li20, we will follow the following steps:

4Li(s) +O2(g)→2Li2O(s)

%yield = {actual yield /theoritical yield }* 100

∴Theoritical yiled ={actual yield / %yield}* 100

={500g 2Li20/86% }*100

∴Theoritical yiled =581 g 2Li2O

(3.1)Mass of Lithium,

• given that molecular mass of LiO2 is 38,94 g/mol and Molecular mass Li = 13.88g/mol

mass lithium =581 g Li2O x (1mol Li2O/38.94g)

*4molLi/2molLiO2*13.88g Li/1molLi

=414g of lithium

(3.2) Mass of oxygen

• given that molecular mass of LiO2 is 38,94 g/mol and Molecular mass of oxygen =32g/mol

Mass of Oxygen = 581 g Li2O x (1mol Li2O/38.94g) *

* 1mol O2 /2molLIO2 * 32gO2 /1mol O2

=238 g of Oxygen

• When we ,introduce heat to the atom,, the electrons within the atoms ,becomes excited, , thus elevating to ,their highest energy ,level.

• When the ,heat subsides,, electrons also ,return to lower energy ,level.

• When this happens , they ,discharge energy in the form of light,, as a results they ,produce different colours of light.,

• This is due to different energy between two levels.

Answer:

yes

Explanation:

molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance

Answer:

Density is defined as the mass of a substance per unit volume, so we can use the given mass and volume to calculate the density of osmium.

Density = mass / volume

Substituting the given values, we get:

Density = 2.72 g / 0.121 m^3

Simplifying, we get:

Density = 22.48 g/m^3

Therefore, the density of osmium is 22.48 g/m^3.

Explanation:

Answer:

22,426 g/m³.

Explanation:

Density is defined as mass per unit volume. To calculate the density of osmium, we need to divide its mass by its volume:

Density = Mass / Volume = 2.72 g / (0.121 cm³ * (1 m³ / 10^6 cm³))

= 2.72 g / 0.121 * 10^-6 m³ = 2.72 * 10^6 g / 0.121 m³ = 22,426 g/m³

So, the density of osmium is approximately 22,426 g/m³.

A. The IUPAC name of the compound is cis-2-pentene

B. The IUPAC name of the compound is trans-2-hexene

The IUPAC name of the using the cis and trans prefixes can be obtained as follow:

Thus, with the abbove information, the name of the compound is cis-2-pentene

The IUPAC name of the using the cis and trans prefixes can be obtained as follow:

Thus, with the abbove information, the name of the compound is trans-2-hexene

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The sand absorbed869,034.8 Joules of energy from the sun to raise its temperature from 14°C to 31°C.

To calculate the energy absorbed by the sand, we can use the formula:

Q = m * C * ΔT

where:

Given:

Mass of the sand (m) = 58.2 kg = 58,200 g (since 1 kg = 1000 g)

Specific heat capacity of the sand (C) = 0.742 J/g°C

Change in temperature of the sand (ΔT) = 31°C - 14°C = 17°C

Plugging in the values into the formula:

Q = 58,200 g * 0.742 J/g°C * 17°C

Q = 869,034.8 J

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Answer:

The sound playing from the first graph is louder, while the sound from the second graph is deeper, both of which have the same pitch.

Explanation:

First let's analyze the graphs,
Comparing the first graph to the second

Concluding from the above observations, the sound playing from the first graph is louder, while the sound from the second graph is deeper, both of which have the same pitch.

:Response: 2.21 atm The ideal gas law says that the pressure of a gas is equal to the quantity of the gas times the universal gas constant (R) times the temperature (T) times the volume (V) divided by the number of moles in the gas.

Consequently, we may apply the following equation to this issue: P = (n*R*T)/V. We may get the pressure of the gas in atmospheres by using the following formula, where n is the number of moles, V is the volume, T is the temperature, and R is the universal gas constant.

P is equal to 2.21 atm or (3.43 mol*0.0821 L*atm/mol*K*492.15 K)/27.17 L. As a result, choice A) 2.21 atm is the right one.

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Answer:

b. R decreases, V is constant, I increases

Explanation:

when we increase the diameter of wire increases ,resistance decreases and current increases.Therefore, the option is b.  

Resistance is an electrical quantity which opposes the electric current in the circuit. Resistance is directly proportional to the length of the wire and inversely proportional to the diameter of the wire. If length of wire increases resistance will increases and if the diameter of the wire increase resistance will decreases.

                                R = ρ L/A

Here ρ is the resistivity

        L is the length of the wire

        A  is the cross-sectional area of wire/diameter of the wire

Voltage is the potential difference between two terminals of voltage source. Current is the flow of electrons in the circuit. Voltage is the product of current and resistance.

                              V=IR

Rewrite the above equation interms of current

                              I=V/R

From the above equation we can say that current is inversly proportional to the resistance.Therefore,the correct option is b.

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Answer:

nebula

Explanation:

I am well informed

Hence,  If the concentration of Acetic acid in vinegar is more than 7%, the limiting reactant is baking soda. If the concentration of Acetic acid in vinegar is less than 7%, the limiting reactant is vinegar.

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

To solve this problem, it is necessary to know the exact concentration of acetic acid in vinegar, because manufacturers produce many types of vinegar the with different concentrations. Most often, concentration of acetic acid in vinegar ranges from 4% to 8%. In this case, it is possible

to calculate the concentration of vinegar making the assumption that 250 ml of vinegar reacts completely with 24 grams of baking soda.

Acetic acid \(CH_3CO_2H\)  reacts with baking soda \(NaHCO_3\) according to the equation:

\(CH_3CO_2H + NaHCO_3\) → \(CH_3CO_2Na + CO_2 + H_2O\)

1. Molar mass of \(NaHCO_3\) is 23+1+12+16×3 = 84 g/mol

= \(\frac{1 mol \;NaHCO_3}{84 g \;NaHCO_3}\)

= \(\frac{24 g \;NaHCO_3 X 1 mol \;NaHCO_3}{84 g \;NaHCO_3}\)

=0.29 mol \(NaHCO_3\)

2. From the balanced equation we see that 1 mole of \(NaHCO_3\) reacts with 1 mole of \(CH_3CO_2H\) , then 0.29 moles of \(NaHCO_3\) react with 0.29 moles of \(CH_3CO_2H\).

3. Mass of 1 mole of \(CH_3CO_2H\) is 12+ 1×3+12+16×2=60 g/mol

= \(\frac{0.29 mol \;CH_3CO_2H X \;60 g \;CH_3CO_2H }{1 mol \;CH_3CO_2H}\)

\(=17.4 g CH_3CO_2H\)

4. In this step density of vinegar is needed.

Making the assumption that concentration of acetic acid is 7%, we can calculate the mass of acetic acid in 250 ml of vinegar:

Mass of vinegar=Volume × density

= 250 ml ×1.0084 g/ml

=252 g

Mass of acetic acid = mass of vinegar × concentration ÷ 100%

= 252 g × 7% ÷ 100%

= 17.6 g.

17.6 g \(CH_3CO_2H\) is very close to 17.4 g \(CH_3CO_2H\). It means, that 250 ml of vinegar with a concentration of acetic acid equal to 7% reacts completely with 24 g of baking soda.

Hence,  If the concentration of Acetic acid in vinegar is more than 7%, the limiting reactant is baking soda. If the concentration of Acetic acid in vinegar is less than 7%, the limiting reactant is vinegar.

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Answer:

Components present of sodium bicarbonate

Sodium bicarbonate is formed by mixing carbon, sodium, hydrogen and oxygen molecules. This mixture, also known as baking soda, is actually a type of salt.

Explanation:

Answer:

False

Explanation:

Negatively charged particles repel other negatively charged particles. Typically a negatively charged particle is electropositive and wants a positive molecule and/or cation (positive ion) to form a bond with. Negative molecules want positive molecules and vise versa.

There are numerous ways to determine whether lead is present in an ore. Atomic absorption spectroscopy is a popular approach. With this method, an ore sample is dissolved in acid and then atomized in a flame or plasma.

The sample's atoms will absorb light at particular wavelengths that are peculiar to the element under investigation. The amount of light absorbed can be used to calculate how much lead is present in the sample. Inductively coupled plasma mass spectrometry and X-ray fluorescence spectroscopy are further techniques. It is crucial to remember that these procedures call for specialized tools and training, thus they ought to only be carried out in a lab by qualified experts.

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The original function f(x) = 1/x becomes g(x) = 1/(x+4) - 3 after the transformation.

The correct transformation function that reflects a shift of 4 units to the left and 3 units down is g(x) = f(x+4) - 3.

This is because, in function notation, adding to the input value inside the function (x+4) shifts the function to the left, while subtracting from the output of the function (-3) shifts it down.

So, the original function f(x) = 1/x becomes g(x) = 1/(x+4) - 3 after the transformation.

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The true statement  for the quantum mechanical atomic model is that Electrons give off electromagnetic radiation when they jump from a high to a low energy level.

Option c is correct.

The quantum mechanical atomic model, also known as the wave mechanical model, describes the behavior of electrons in atoms as waves.

This model described that only electrons can exist only in certain discrete energy levels around the nucleus. When an electron absorbs energy, it moves to a higher energy level.

In other words, when it loses energy, it moves to a lower energy level.

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Set up A will dissolve the 100g of sugar fastest in 1 L of water due to the inclusion of physical agitation in the form of stirring.

We have to note that energy and sometimes physical agitation are necessary in order to dissolve a solid in a liquid. In this case, we want to dissolve sugar in water.

Set up A in which the temperature is raised to 80 degrees with agitation will dissolve the 100g of sugar fastest in 1 L of water due to the inclusion of physical agitation in the form of stirring.

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