The period of development from fertilized egg to birth is known as [tex]{ \bf{ \underbrace{prenatal\: development}}}[/tex].
[tex]\bold{ \green{ \star{ \orange{Mystique35}}}}⋆[/tex]
What dose the wave carry
Answer:
Waves carry energy from one place to another.
Because waves carry energy,some waves are used for communication,eg radio and television waves and mobile telephone signals.
Explanation:
i hope it helps
that's my answer
correct me if im wrong
#carryonlearningthe structure of butanoic acid
answer on here fjchcjfjdnc.com
Timed PLS help
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answer:
19.5g is the theoretical yield of alum
Explanation:
Based on the balanced reaction, 4 moles of sulfuric acid produce 2 moles of alum. To solve this question we need to find the moles of H2SO4. With these moles we can find the moles of alum and its mass assuming all sulfuric acid reacts producing alum.
Moles Sulfuric Acid:
8.3mL = 0.0083L * (9.9mol/L) = 0.08217 moles sulfuric acid
Moles Alum:
0.08217 moles sulfuric acid * (2mol KAl(SO4)2•12H2O / 4mol H2SO4) =
0.041085 moles KAl(SO4)2•12H2O
Mass Alum -Molar mass: 474.3884 g/mol-
0.041085 moles KAl(SO4)2•12H2O * (474.3884 g/mol) =
19.5g is the theoretical yield of alumIs lithium ionization energy high low or medium?
Which sentence about an ocean current is correct
Upwelling is caused by the winds that on the oceans surface is the correct answer.
What are Ocean Current ?Ocean currents are water flow patterns that have an impact on climate zones and weather patterns all around the globe.
When winds blow they push the water from an area and to replace the displaced water water rises from beneath the surface and this process is called Upwelling.
Therefore Option C , Upwelling is caused by the winds that on the oceans surface is the correct answer.
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(13)
QUESTION 5
5.1
Sulphur reacts with iron according to the equation:
Fe +S → FeS
The reaction requires large amount of heat
When 2,5g sulphur and 5 g iron were placed in a test tube and heated strongly, a
reaction took place to produce a greyish black solid. After the reaction was completed
the solid was found to be magnetic.
5.1.1 Why was this greyish black solid magnetic?
5.1.2 Calculate the mass of Fos produced
Answer:
The black solid is magnetic due to the special property of iron called ferromagnetism
6.9 g
Explanation:
The substance FeS is magnetic despite of the fact Fe^2+ is spin paired due to the special magnetic property of iron called ferromagnetism.
The equation of the reaction is;
Fe(s) + S(s) ----> FeS(s)
Number of moles of Fe = 5g/56g/mol = 0.089 moles
Since the reaction is 1:1, 0.089 moles of FeS is formed
For Sulphur;
Number of moles of sulphur = 2.5g/32 g/mol = 0.078 moles
Since the reaction is 1:1, 0.078 moles of FeS is formed
Hence sulphur is the limiting reactant.
So, mass of FeS produced = 0.078 × 87.91 g/mol = 6.9 g
In the diagram shown, what is occurring at the section marked 4 ?
Temperature
:: ا
4
2
Heat Energy
O Melting
Freezing
O Condensation
O Vaporization
Answer:
Vaporization
Since the question does not specify what molecule is being acted upon by the increment in temperature, I'll assume it's water.
When first taken out of the fridge, water is in the form of ice, and it has not been affected by a change in temperature yet, so it's at the origin.
(origin = ice)
As you raise the temperature, however, the ice starts to melt, and melting occur during phase 2. You have to keep the temperature constant for the process to properly occur.
(phase 2 = melting)
After it finishes melting, the ice is now in it's liquid state, which is water. The temperature continues to rise in order to proceed to the next phase.
(2nd slope = water)
Lastly, Water is being vaporized during phase 4. Notice, the temperature is kept constant in order to allow the process to properly occur.
(phase 4 = vaporization)
What happens to the electric force between two particles if the distance
between them is doubled?
Answer:
The size of the force varies inversely as the square of the distance between the two charges. Therefore, if the distance between the two charges is doubled, the attraction or repulsion become weaker, decreasing to one-fourth of the original value. ...The size of the force is proportional to the value of each charge.
The table below shows two types of electromagnetic waves and three random applications of electromagnetic waves.
Type of Wave Applications of Waves
Gamma rays 1. Used in spectrometers to measure elements on the surface of celestial bodies
Radio waves 2. Used to measure gravity fields
3. Detect the heat released by astronomical objects
Which of these best matches the waves with their applications?
Gamma rays—2 and radio waves—3
Gamma rays—3 and radio waves—2
Gamma rays—2 and radio waves—1
Gamma rays—1 and radio waves—2
Answer:
Gamma rays—3 and radio waves—2
Explanation:
hard time seeing question, but i believe it is Gamma rays—3 and radio waves—2
URGENT!!!
A solution has a [H3O+] of 1 × 10−5 M. What is the [OH−] of the solution? (5 points)
9 M
14 M
1 × 10−9 M
1 × 10−14 M
Answer:
[tex]{ \bf{from \: ionic \: product \: of \: water : }} \\ { \boxed{ \tt{k _{w} = [H _{3} O {}^{ + } ][OH {}^{ - } ]}}} \\ \\ { \tt{1 \times {10}^{ - 14} = (1 \times {10}^{ - 5} ) [OH {}^{ - } ]}} \\ \\ { \tt{[OH {}^{ - } ] = 1 \times {10}^{ - 9} }} \: M[/tex]
A solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
What is [OH−] of the solution?The water is made up of H2O only and when the pH of it is 7 then the concentration of all the ions would be the same while dissociation the water will get dissociate into H+ ions and OH- ions.
The concentration of OH- ions will be
OH- = Kw {H3O+}
{H3O+} = 1 × 10−5 M.
Kw = 14
substituting the value in the equation,
OH = 14 { 1 × 10−5 M.}
OH = 1 × 10−9 M
Therefore, the solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
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do the
math!
Wavelength Frequency
Speed
Medium
200 Hz
1500 m/s
The table shows measurements of
some properties of a sound wave in
water and in air.
Water
400 Hz
3.75 m
Water
343 m/s
Air (20°C)
10 m
Calculate Using what you know
about the relationship between
wavelength, frequency, and speed,
fill in the table.
17.15 Hz
343 m/s
Air (20°C)
1a
CHALLENGE What can this table
tell
you about the speed of a wave?
Answer:
everything can be found in the picture
In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. Which postulate of kinetic molecular theory best explains
how this is possible?
Attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly
O Collisions between gas particles are elastic, there is no net gain or loss of kinetic energy
Gases consist of a large number of small particles, with a lot of space between the particles
O Gas particles are in constant, random motion, and higher kinetic energy means faster movement
answer:Collisions between gas particlCollisions between gas particles or collisions with the vessel walls are perfectly elastic.
explanation:As long as an ideal gas is maintained at a constant temperature, the average kinetic energy of the molecules is said to be constant. In fact, what we call the temperature of a body at the macroscopic scale is just a representation of the kinetic energy carried by its atoms or molecules as they vibrate inside the body.
Now, if the kinetic energy of this oxygen gas is constant, it is because the collisions between the particles are assumed to be perfectly elastic. No energy is lost during the collisions. The rationale behind this assumption is that the particles are very tiny.
The answer which corresponds best to the explanation above is b. Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.
How many valence electrons does Chlorine need to GAIN to become stable?
Answer:
An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability. Group 16 elements with six valence electrons are almost as reactive for the same reason
Explanation:
Analyze the given diagram of the carbon cycle below. An image of carbon cycle is shown. The sun, a cloud, two trees, one towards left and the other towards right, an animal, lake, and a factory are included. Arrow A points from the sun to the left tree. Arrow B points from the air above the clouds to the left tree. Arrow C points from the factory towards the air above the clouds. Arrow D points from the air to the lake labeled Carbonates in Water. Arrow E points from the label Dead Organism under the animal to label Fossils and Fossil Fuels. Arrow F points from the right tree to the air. Part 1: Which process does arrow A represent? Part 2: Which type of energy transformation does arrow A represent? Part 3: Justify why this process is a recycling of carbon in the carbon cycle.
Answer:
Arrow a represents photosynthesis. 2 it transforms sunlight, water, and carbon dioxide into gluton, or food for the plants. 3 It recycles carbon because humans breath in oxygen and exhale carbon dioxide, plants then take in the carbon and exhale oxygen.
Explanation:
In which type of bond are electrons shared equally between two atoms?
Answer:
Nonpolar Covalent Bond
Explanation:
A nonpolar covalent bond is one in which the bonding electrons are evenly distributed between the two atoms.
Good Luck!
Hope this helps!
:)
A compound contains 46.67% Silicon and 53.33% oxygen. What is the
simplest formula for this compound?
Answer:
SiO2
Explanation:
Given the reaction at equilibrium:
H2(g) + Cl2(g) → 2HCl(g) + heat
The equilibrium will shift to the right when there is an
increase in
A temperature
B pressure
C concentration of H2(g)
O concentration of HCl(g)
Which of the following is an advantage of using an energy-efficient household
appliance instead of a traditional household appliance?
A. It works only during the daytime.
B. It uses no electricity
c. It conserves electricity.
D. It does not work as effectively
The number of protons plus the number of neutrons in an atom is equal to its
atomic number
mass number
nuclear model
energy level
Explanation:
mass number....................
type of intermolecular forces in paraffin
Answer:
The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.
Explanation:
Answer: The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.
Explanation:
The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent. 103 Paraffin wax is soluble in: a) water; b) hexane; c) acetone; d) ethanol Is shopping bag (polyethylene)
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What volume of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water?
Answer:
200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water.
Explanation:
The solution is the result of the mixture between the solute, which is the substance that dissolves, and the solvent, which is the substance in which a solute dissolves. That is, a solution (or solution) is a mixture of two or more components, perfectly homogeneous since each component is intimately mixed with the other.
The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. A unit of concentration is the percent weight to volume.
The percent weight to volume is the percentage ratio between the weight of the solute and the volume of the solution. It is calculated as:
[tex]Percent =\frac{mass of solute}{volume of solution} *100[/tex]
Mass is measured in grams, while volume is measured in mL.
In this case:
Percent weight to volume= 6%mass of solute= 12 gvolue of solution= ?Replacing:
[tex]6=\frac{12 g}{volume of solution} *100[/tex]
Solving:
volume of solution*6= 12 g*100
[tex]volume of solution=\frac{12 g}{6} *100[/tex]
volume of solution= 200 mL
200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water
Determine the number of protons, electrons, and neutrons present in an atom of patassium. Explain how you determined your answer using complete sentences.
Please make sure your right.
Thank you!!!
7th grade science help me plsssss
Answer:
They grow slowly over time, they are made up of multiple organisms.
Explanation:
One polyp is one individual. A Coral is made up of several polyps. Each polyp is less than 1 centimeters but a coral is made of many polyp so the coral itself cant be 1 centimeters across.
Dos moléculas de Clorato de Potasio en estado sólido, al aplicarle calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso ¿como se representan?
Answer:
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
Explanation:
Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.
Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.
Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.
Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple
Identify the atom oxidized, the atom reduced, the oxidizing agent, and the reducing agent. 2Fe + 3V2O3 -------> Fe2O3 + 6VO
Explanation:
Fe- reducing agent (since it is oxidized to fe203)
v203- oxidizing agent(since it is reduced)
In the given reaction, Fe is the reducing agent and V is the oxidizing agent.
What is a reducing agent?An atom or compound that loses its electrons to other substances in a reduction-oxidation reaction and gets oxidized to a higher valency state is called a reducing agent.
A reducing agent can be defined as one of the reactants of a redox reaction that reduces the other reactant by giving its electrons to the reactant. If the reducing agent can not give away its electrons to others in a reaction, then the reduction reaction cannot occur.
Given, the following chemical reaction:
2Fe + 3V₂O₃ → Fe₂O₃ + 6VO
The V₂O₃ oxidation state of V:
2 x + 3(-2) = 0
2x = 6
x = + 3
The Fe₂O₃ oxidation state of Fe:
2 y + 3 (-2) = 0
2y = 6
y = + 3
The V acts as an oxidizing agent because it accepts one electron to change the oxidation state from +3 to +2.
Fe acts as a reducing agent because it gives out its electrons to change the oxidation state from 0 to +3.
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An ionic substance is formed between a positively charged cation and a negatively charged anion. Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions. Which of the following substances are ionic? Check all that apply. Check all that apply. AlCl3 MgI2 C2H5OH NH3
Answer:
Which of the following substances are ionic?
Check all that apply.
AlCl3
MgI2
C2H5OH
NH3
Explanation:
An ionic substance is formed between a positively charged cation and a negatively charged anion.
Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.
Among the given substances,
MgI2 is an ionic substance.
Since Mg is the metal atom. It forms a cation.
I is a nonmetal atom. It forms anion.
Hence,
MgI2 is an ionic substance.
Though AlCl3 looks like an ionic substance it is a covalent compound.
This is due to the high polarizability of [tex]Al^3+[/tex] ion.
The remaining two compounds do not contain any metal atoms.
So, ethanol and NH3 are not ionic compounds.
Answer:
MgI2
A change in 1 degree Celsius is = a change in 1 Kelvin
True
False
Answer:
true
Explanation:
because I'm smart yes yes
Read the selection from the section "Molecules In Motion." The molecules in the hot soup are traveling faster overall than they did before the soup was heated. Conversely, the molecules in an ice cube are moving more slowly. Why did the author use the word "conversely"?
Answer: The author used the word "conversely" because the first statement he made is in CONTRAST to the second statement he made.
Explanation:
Matter is made up of atoms or molecules that are in constant motion. The motion of these tiny particles ( molecules) gives the object energy. The movement of these molecules depends on the state of matter which includes
--> GASEOUS STATE: Here, the particles are completely free to move and are always in motion.
--> LIQUID STATE: particles in this state slide by one another and are always in motion.
--> SOLID STATE: particles in this state are held tightly together but are always in motion.
Also, the molecules in motion are greatly affected by temperature changes. Increase in temperature will cause the particles in the liquid to move faster. Such is seen when soup is heated, the molecules travel faster than before. But the OPPOSITE is seen in an ice cube. This is because the ice cube is in solid state and of a lower temperature.
Which sublevel contains valance electrons in an atom of magnesium (mg)?
A. 2s
B. 2p
C. 3s
D. 3p
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
