Answer:
The five steps involved in the process of natural selection are
Variation • Inheritance • Selection • Time • Adaptation
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What is the mass of the solute in 750 mL of 0. 132 mol/L potassium carbonate?
mol = 0.75 L(750 ml) x 0.132 mol/L =0.099 mol
potassium carbonate: K₂CO₃ ⇒ MM = 138,205 g/mol
mass = 0.099 x 138.205 = 13.68 g
Sodium hydroxide is soluble as shown by the following reaction: NaOH(s)-> Na +(aq) + OH-(aq). What is the pOH of a 3.0x10^-3 NaOH solution?
Sodium hydroxide is a soluble strong base. The pOH of a 3.0 × 10⁻³ M-sodium hydroxide solution is 2.5.
What is a base?According to Arrhenius, a base is a species that releases OH⁻ ions in an aqueous medium.
Let's consider the basic reaction of NaOH.
NaOH(s) ⇒ Na⁺(aq) + OH⁻(aq)
NaOH is a strong base. This means that the concentration of OH⁻ will be equal to the initial concentration of NaOH, i.e. 3.0 × 10⁻³ M.
Then, we can calculate the pOH of the NaOH solution using the following expression.
pOH = -log [OH⁻] = -log 3.0 × 10⁻³ = 2.5
Sodium hydroxide is a soluble strong base. The pOH of a 3.0 × 10⁻³ M-sodium hydroxide solution is 2.5.
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Answer:2.5
Explanation:
Using reliable internet resources, identify ways we use radio waves on Earth.
Answer:
Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.
Explanation:
Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.
What are radio waves?An electromagnetic wave of a frequency between about [tex]10^4[/tex] and [tex]10^{11}[/tex]or [tex]10^{12}[/tex] Hz, as used for long-distance communication.
AM and FM Radio Broadcasting which involves transmitting sound to a wide audience.
Radar is a detection system that uses radio waves to get information about objects.
Bluetooth and wireless communication use radio waves to create connections between devices.
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What is the best reason that fire is not considered a living organism?.
Answer:
all living organisms have cells fire does not
Reading Strategy (page 412)
Relating Text and Visuals As you read, look carefully at Pigures 1
and 2 and read their captions. Complete the table by describing the
work ohown in each figure for more information on this Reading
Strategy, see the Reading and Study Skills in the skills and
Reference Handbook at the end of your textbook
Figure
Direction
of Force
Oirection
of Motion
Is Work
Dono?
20
20
20
412 A101
Work is said to be done when force moves a distance and the direction of motion is in the direction of applied force.
What is work done?Work done is defined as the product of applied force and the distance which the applied force moves.
According to Newton's second law of motion the acceleration of a body is inversely to its mass ut directly proportional to the force and takes place in the direction of the applied force.
Therefore, work is done when force moves a distance and the direction of motion is in the direction of applied force.
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2) What amount of pressure is felt when your science teacher sits on a seat of nails
which measures 9 in by 9 in? Your science teacher weighs 280 pounds.
Answer:
23936.5 N/m² or 23936.5 Pa
Explanation:
Unit conversion
inches to meters ⇒ × 0.0254pounds to kilograms ⇒ × 0.45Our dimensions
9 inches ⇒ 0.229 m280 pounds ⇒ 127.01 kgSolving
P = F/AP = mg/AP = 127.01 x 9.8 / 0.229 x 0.229P = 1244.698 / 0.052P = 23936.5 N/m² or 23936.5 Pawhat volume of N2 is required to convert 5.0L of hydrogen gas to ammonia? assume that all gases are at the same temperature and pressure and that the reaction is complete
Answer:
Approximately [tex]1.7\; {\rm L}[/tex].
Explanation:
Nitrogen [tex]{\rm N_{2}}\, (g)[/tex] reacts with hydrogen [tex]{\rm H_{2}}\, (g)[/tex] at a [tex]1:3[/tex] ratio to produce ammonia [tex]{\rm NH_3}\, (g)[/tex]:
[tex]{\rm N_{2}}\, (g) + 3\; {\rm H_{2}}\, (g) \to 2\; {\rm NH_{3}}\, (g)[/tex].
The ratio between the coefficient of [tex]{\rm N_{2}}\, (g)[/tex] and the coefficient of [tex]{\rm H_{2}}\, (g)[/tex] is:
[tex]\begin{aligned}\frac{n({\rm N_{2}})}{n({\rm H_{2}})} = \frac{1}{3}\end{aligned}[/tex].
Under the ideal gas assumptions, the same ratio would apply to the volume of [tex]{\rm N_{2}}\, (g)[/tex] and [tex]{\rm H_{2}}\, (g)[/tex] in this reaction:
[tex]\begin{aligned}\frac{V({\rm N_{2}})}{V({\rm H_{2}})} = \frac{n({\rm N_{2}})}{n({\rm H_{2}})} = \frac{1}{3}\end{aligned}[/tex].
[tex]\begin{aligned}V({\rm N_{2}})= \frac{1}{3}\, V({\rm H_{2}})\end{aligned}[/tex].
Given that [tex]V({\rm H_{2}}) = 5.0\; {\rm L}[/tex]:
[tex]\begin{aligned}V({\rm N_{2}}) &= \frac{1}{3}\, V({\rm H_{2}}) \\ &= \frac{1}{3}\times 5.0\; {\rm L} \\ &\approx 1.7\; {\rm L}\end{aligned}[/tex].
(Rounded to [tex]2[/tex] significant figures.)
Identify whether each compound is a straight chain, branched chain, or cycloalkane.
Answer:
the first one is branched, the second one is also branched and the third one is cycloalkane
Answer:
A: straight chain, B: branched chain, and C: cycloalkane.
Explanation:
What makes a light wave different from all mechanical waves?
Answer:
Light is a transverse wave.
Explanation:
Light waves are not considered mechanical waves because they don't involve the motion of matter. Most of the mathematics and properties of mechanical waves apply to light waves. Light waves are different from mechanical waves, however, because they can travel through a vacuum.
A tempature of -30 c is equivalent to?
Answer:
-30°C = -22°F
-30°C = 243.15K
Explanation:
For converting Celsius to Fahrenheit, this is the equation-
(-30°C × 9/5) + 32 = -22°F
For converting Celsius to Kelvin, this is the equation-
-30°C + 273.15 = 243.15K
if you start out with 5.33 moles F2 and 2.22 moles NH3.
a. Identify the limiting reagent for the given combination of reactants.
b. Calculate how many grams of HF will be made.
Show work.
a. For the given combination of reactants, the limiting reagents is F₂
b. The mass of HF that would be made is 106.65 g
Stoichiometry
From the question, we are to identify the limiting reagent and calculate the mass of HF made
First, we will write the balanced chemical equation for the reaction
3F₂ + NH₃ → 3HF + NF₃
This means 3 moles of F₂ reacts with 1 mole of NH₃ to produce 3 moles of HF and 1 mole of NF₃
From the given information,
We have 5.33 moles of F₂ and 2.22 moles of NH₃
Since,
3 moles of F₂ reacts with 1 mole of NH₃
Then,
5.33 moles of F₂ will react with 1.78 moles of NH₃
Therefore, NH₃ is in excess and F₂ is the limiting reagent
Hence, for the given combination of reactants, the limiting reagents is F₂
b. For the mass of HF that would be made
From the balanced chemical equation,
3 moles of F₂ reacts with 1 mole of NH₃ to produce 3 moles of HF
Then,
5.33 moles of F₂ will react with 1.78 moles of NH₃ to produce 5.33 moles of HF
Number of moles of HF produced = 5.33 moles
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of HF = 20.01 g/mol
∴ Mass of HF produced = 5.33 × 20.01
Mass of HF produced = 106.65 g
Hence, the mass of HF that would be made is 106.65 g
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Explain the following a. the mole of a substance. b.a standard solution
a. the mole of substance
b.a standard solution
in analytical chemistry standard solution is a solution containing a precisely known concentration of an element or a substance.
A known mass of solute is dissolved to make a specific volume. it is prepared using a standard solution,such as a primary standard.
hope this helps you
Which foods are examples of complex carbohydrates? (Select all that apply.)
Answer:
Here all the given options are examples of complex carbohydrates.
Explanation:
As all these contains sugar, starch and fibre.
The partial pressure of carbon dioxide is greatest in:.
Answer:
Partial pressure of carbon dioxide is high in the pulmonary capillaries.
Explanation:
two ways a community can protect the water supply.
Answer:
Keep the tap closed when not using it, and to not use it every day, like washing a car, you can clean it with a sponge and a bucket of water.
Explanation:
I don't know if this helps though.
If the temperature of a 50mL sample of a gas is changed from 200K to 400K under constant pressure, what is the new volume of the gas?
[tex] \text{V}_1 = 50 \text{ml }\\ \text{T}_1 = 200 \text{K} \\ \text{V}_2 = ? \\ \text{T}_2 = 400 \text{K}[/tex]
To find:-[tex] \text{The Value of V}_2[/tex]
Solution[tex]\frac{ \text{V}_1}{ \text{T}_1} = \frac{ \text{V}_2}{ \text{T}_2}[/tex]
[tex] \frac{50}{200} =\frac{ \text{V}_2}{400} \\ \\ \fbox{cross multiplying} \\ \\ \implies 200 \times V_2 = 50 \times 400 \\ \\ \implies V_2 = \frac{50 \times 400}{200} \\ \\ \implies V_2 = \frac{50 \times \cancel{ 400} { \: \: \: }^{2} }{ \cancel{200}} \\ \\ \implies V_2 = 50 \times 2 \\ \\ \implies V_2 = 100[/tex]
[tex] \therefore \implies V_2 = 100 \text{ml}[/tex]
Hope This Helps!!differentiate between condensation polymerization and addition polymerization
Explanation:
The difference between addition polymerization and condensation polymerization is that in addition polymerization the polymers are formed by the addition of monomers without any by-products whereas in condensation polymerization, the polymers are formed due to the condensation of more than one different monomers resulting in the formation of small molecules such as HCl, water, etc., as by-products.
what is the pH of a solution with a pOH of 3.23
Answer:
10.77
Explanation:
The relationship between pH and pOH is
pH + pOH = 14
Plugging in the pOH makes
pH + 3.23 = 14
And solving for pH by subtracting 3.23 on both sides
pH = 10.77
What effect does sunlight have on CO2 molecules?
Answer:
CO2 molecules don't really interact with sunlight's wavelengths. Only after the Earth absorbs sunlight and reemits the energy as infrared waves can the CO2 and other greenhouse gases absorb the energy.
Explanation:
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Carbon dioxide molecules don't directly react with the sunlight but they can absorb the energy in the form of infrared waves when it is emitted after reflection through the Earth's surface.
What are infrared waves?Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).
[tex]CO_2[/tex] molecules don't really interact with sunlight's wavelengths. Only after the Earth absorbs sunlight and reemits the energy as infrared waves can the [tex]CO_2[/tex] and some other greenhouse gases absorb the energy.
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please help
If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
If the colored spheres are solutes, the overall direction of water would be out of the cell based on the principle of osmosis.
What is osmosisIt is the movement of water molecules from the region of high water potential (low solutes) to the region of low water potential (high solute) through a selectively permeable membrane.
In the illustration, there are more colored spheres outside of the cell than inside of it. This means that there are more solutes outside the cell (lower water potential) than inside of the cell (higher water potential).
Thus, water will move from the inside of the cell to the outside until an equilibrium is established.
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What best describes these three molecules? they are not isomers. they are structural isomers. they are geometric isomers. they are both structural and geometric isomers.
Answer:
B
Explanation:
Answer:
The correct answer is B.
They are structual isomers.
The equation below represents a chemical reaction. Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) A 5.00-g sample of zinc is added to hydrochloric acid. The amount of hydrochloric acid is sufficient to allow the zinc to react completely. What mass of hydrogen gas does this reaction produce? A. 0.0308 g B. 0.0771 g C. 0.121 g D. 0.154 g
Answer:
D
Explanation:
The solubility of solid substances generally ___________ as temperature increases. The solubility of gaseous substances generally ___________ as temperature increases.
How much water should be added to 85 mL of a 10.0 M stock solution to produce
a 1.0 M dilute solution
765
Explanation:
C1V1=C2V2
10×85=1×V2
V2=850
V'=V2-V2
V'=850-85
V'=765ml
All the following are examples of common materials EXCEPT?
The change in enthalpy that occurs in the process of converting reactants to products in a chemical reaction is called the _____ of reaction.
Answer:
Heat or Enthalpy of reaction
This is denoted as ∆H∆H is the enthalpy the of the reaction If ∆H is positive reaction is exothermic otherwise endothermicDefine the main temperature, precipitation, location and soil characterisitcs of the following Biomes.
1. Tundra
2. Temperate Grassland
3. Tropical Rainforest
Answer:
Tundra :a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen.
Temperate grasslands are characterized as having grasses as the dominant vegetation.
Tropical rainforests are rainforests that occur in areas of tropical rainforest climate in which there is no dry season – all months have an average precipitation of at least 60 mm – and may also be referred to as lowland equatorial evergreen rainforest.
If a zero order reaction has a rate constant k of 0.0416Mmin and an initial concentration of 2.29 M, what will be its concentration after 20.0 minutes
Answer:
1.46 M
Explanation:
[A]t=−(0.0416 M/min) x (20.0 min)+2.29 M
[A]t=1.46 M
b. Identify Table sugar has the chemical formula
C12H22O11 What is the ratio of carbon atoms
to oxygen atoms in this compound?
Answer:
great keep up the good work your teacher
."A ternary covalent compound consists of 3 types of nonmetallic elements in its chemical formula." Which is NOT an example of a ternary covalent compound ? A. Ozone (03)
B. Sucrose (C12H22011)
C. Carbonic acid (H2C03)
D. Ammonium sulfide (NH4)2s