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The control group is the group of mold spores that were not exposed to ultraviolet light, left in the darkness and as such were not altered. Control groups are not altered and serve as some form of measurement of the experimental group. The experimental group is the mold spores group exposed to ultraviolet light and observed to note the difference between it and the control group
Answer:
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Related Questions
Cho biết X, Y (ZX < ZY) là hai nguyên tố mà lớp vỏ nguyên tử có electron cuối cùng điền vào phân lớp 4s.
a/ Viết cấu hình electron của X, Y.
b/ Viết kí hiệu nguyên tử của X, Y.
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If you compare the mass of a
substance before and after a
change, what will you find?
A. The mass before is greater than after.
B. The mass before equals the mass after.
C. The mass after is greater than before.
Answers
Answer:
the answer is (B)
the mass before equals the mass after
what type of bonds exists between neighboring water molecules?
Answers
Answer:
covalent bonds
Explanation:
What statement most likely describes the effects of this movement at each location?
Location A creates a volcano; Location B uplifts and forms a mountain
Location A uplifts and forms a mountain; Location B creates a volcano
Location A creates a gap allowing molten material to seep through; Location B melts and recycles the crust
Location A melts and recycles the crust; Location B creates new ocean crust
Answers
Answer:
C hope it helps
Explanation:
Answer:
location A creates a volcano
Explanation:
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Lighting a match is an example of what kind of energy conversion?
A. Chemical potential energy being converted to heat energy
B. Chemical potential energy being converted to kinetic energy
C. Gravitational potential energy being converted to heat energy
D. Kinetic energy being converted to chemical potential energy
Answers
Answer:
Mechanical Energy to Thermal Energy
When you strike a match, it moves through the air until it rubs against a surface. The rubbing produces the heat required to light the match. This is a transformation from mechanical energy to thermal (heat) energy.
Explanation:
Answer:
A is the answer.
Explanation:
Pls help me with this chemistry work.
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This seems to be a Hess' Law problem. Hess' Law states that "states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes." (Libretext)
Compare the step reaction to the final reaction to see the similarity and differences. We may have to flip an equation or multiply it by a constant to obtain the number of moles of the species in the final equation. Just remember, whatever we do to the equation, we have to do to the ΔH as well.
3C + 4H₂ → C₃H₈ ΔH= +104 kJ [1]
C + O₂ → CO₂ ΔH= -394 kJ [2]
2H₂ + O₂ → 2H₂O ΔH= -572 kJ [3]
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O ΔH = ?
_____________________________________________
Compare the Equation
Equation [1]
In [1] the C₃H₈is on the product side. But the final equation has the C₃H₈ on the reactant side. Thus we have to flip the equation. This flips the sign of ΔH.
C₃H₈ → 3C + 4H₂ ΔH= - 104 kJ [1]
Equation [2]
The CO₂ in the final equation is on the product side but is 3 moles. Thus we have to multiply [2] by three. The ΔH is also multiplied by 3.
3C + 3O₂ → 3CO₂ ΔH= 3 (-394 kJ) [2]
Equation [3]
The H₂O in the final equation has a coefficient of 4. Thus we have to multiply [3] by 2.
4H₂ + 2O₂ → 4H₂O ΔH= 2(-572 kJ) [3]
Combine the Equations
Combine the newly sorted versions of the equation and simplify to see if it matches the final equation. We also add the ΔH.
⇒ C₃H₈ + 3C + 3O₂ + 4H₂ + 2O₂ → 3C + 4H₂ + 3CO₂ + 4H₂O
ΔH= - 104 kJ + 3 (-394 kJ) + 2(-572 kJ)
⇒ C₃H₈ + + 5 O₂ → 3CO₂ + 4H₂O
ΔH= - 104 kJ + 3 (-394 kJ) + 2(-572 kJ) = −2430 kJ
∴ the ΔH of the final equation is −2430 kJ.Use the reaction to answer the question.
Zn + 2HCI - ZnCl2 + H2
Which type of reaction is this?
(1 point)
o electronegative
O replacement
combustion
O ionic
Answers
Answer:
i think its replacement
Explanation:
By definition, the correct answer is the second option: the reaction is a replacement.
A simple substitution reaction or simple displacement reaction, called single-displacement reaction, is a reaction in which an element of a compound is substituted by another element involved in the reaction.
The starting materials are always pure elements and an aqueous compound. And a new pure aqueous compound and a different pure element are generated as products.
The general form of a simple substitution reaction is:
AB + C → A +BC
where C and A are pure elements; C replaces A within compound AB to form a new co, placed CB and elementary A.
A single-displacement reaction is characterized by a place of exchange of cations or anions with another to form a new product. A begins as an ion in the solution and appears elementally in the reaction products. In case of reagent C it starts in its elemental form and ends as an ion in an aqueous state forming compound BC.
In this case, it is a single replacement reaction where 1 atom of Zinc metal displaces 2 H⁺ ions from the hydrochloric acid to form hydrogen gas and zinc chloride, a salt.
Finally, the correct answer is the second option: the reaction is a replacement.
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https://brainly.com/question/11666844?referrer=searchResultshttps://brainly.com/question/21250889?referrer=searchResultshttps://brainly.com/question/7039713?referrer=searchResultsrusting of iron can be prevented by wrapping iron articles in newspaper true or false
Answers
false, the rusting of iron can be prevented by painting, oiling, greasing or varnishing its surface.
What is H2O (water) classified as? Question 4 options: a molecule an atom an element a diatomic molecule
Answers
Answer:
its classified as a molecule
Magnesium metal is placed in sulfuric acid. The solution begins to bubble. The remaining liquid is an ionic solution..... What is the equation for this reaction.
pls balance the equation
Answers
Answer:
M g ( s) + 2 H + ( a q) + 2 S O 4 2 − ( a q) -> M g 2 + ( a q) + 2 S O 4 2 − ( a q) + H 2 ( g) The reaction forms magnesium sulfate and hydrogen gas. As the sulfate is still aqueous on either side of the equation, we can leave it out of the ionic equation (it is a spectator ion).
Explanation:
The chemical equation of Magnesium and sulfuric acid:
Mg + H₂SO₄ → MgSO₄ + H₂
What is the chemical equation?A chemical equation can be described as the equation of a chemical reaction involving substances. An equation consists of reactants contributing, formed products, and an arrow to indicate a chemical reaction.
The balanced equation of a reaction involving an equal number of atoms of substances on either side of the equation is known as a balanced chemical equation.
The law of conservation of mass will be followed by such an equation. By obeying this law, the total mass of the reactants as well as products should be equal in a balanced chemical equation.
Given the reaction of Magnesium metal placed in sulfuric acid. The solution starts to bubble as there is the formation of hydrogen gas.
Mg + H₂SO₄ → MgSO₄ + H₂
Learn more about the chemical equation, here:
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I need help on this one too
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Answer:
The answer option which best describes nuclear fission is: C. A nucleus collides with a neutron and splits, releasing energy.
A nuclear reaction can be defined as a type of reaction in which the nucleus of an atom is transformed by either being joined (fusion) or split (fission) with the nucleus of another atom of a radioactive element and accompanied by a release of energy.
Explanation:
Assuming all other conditions remain the same, which of the following will cause an object's density to increase?
A) Its mass increases
B) its volume increases
C) its atoms move together
D) all of the above
Answers
Taking into account the definition of density, assuming all other conditions remain the same, increasing mass will cause an object's density to increase.
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. That is, density is a quantity referred to the amount of mass contained in a given volume.
Density is an intensive property since it does not vary with the amount of substance.
Since density is the relationship between the mass and the volume of a substance, its calculation is defined as the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In the previous expression it can be observed that the density is inversely proportional to the volume: the smaller the volume occupied by a certain mass, the greater the density.
On the other hand, density is directly proportional to mass: the greater the mass, the greater the density.
Finally, assuming all other conditions remain the same, increasing mass will cause an object's density to increase.
Learn more about density:
brainly.com/question/952755?referrer=searchResults brainly.com/question/1462554?referrer=searchResultsnucleolus what is a nucleolus
Answers
Answer:
Its a small dense spherical structure in the nucleus of a cell during interphase.
An electric current is passed through water and bubbles start forming. What is a logical conclusion for the bubbles?
A) water is evaporating
B) The water had impurities
C) A physical changes occurred
D) Hydrogen and oxygen are being formed
Answers
How is the molar mass of a molecule determined? What are its units?
Answers
Answer:
adding the standard atomic masses (in g/mol) of the constituent atoms.
What do light bulbs emit to produce light?
Group of answer choices
protons
electrons
neutrons
photons
Answers
Light bulbs emit photons to produce light. Photons are packets of electromagnetic energy, and when an electric current passes through the filament of a light bulb, it heats up and produces light. Option D is correct.
When an electric current passes through the filament of a light bulb, the filament gets heated up due to the resistance of the material. This heating process causes the filament to become incandescent, meaning it emits light as a result of being heated to a high temperature.
The emitted light consists of photons, which are particles of electromagnetic energy. These photons carry the energy released from the heated filament in the form of electromagnetic waves, resulting in the visible light that illuminates the surrounding area. Protons, electrons, and neutrons are subatomic particles and are not involved in the process of emitting light in a light bulb.
Hence, D. is the correct option.
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--The given question is incomplete, the complete question is
"What do light bulbs emit to produce light? Group of answer choices A) protons B) electrons C) neutrons D) photons."--
What type of bond exists when valence electrons are collectively attracted to positively-charged nuclei but are still mobile enough to travel among all of the nuclei?
a) ionic
b) metallic
c) covalent
d) London dispersion
Answers
Answer:
Ionic bond
Explanation:
The measure of the average kinetic energy of molecules is known as
Answers
Answer:
Temperature is a measure of the average kinetic energy of the particles in a substance.
Explanation:
What group is this Element in?
Group 3
Group 4
Group 7
O Group 1
Answers
Answer:
Explanation:
It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it belongs to the broader grouping of the transition metals.
what is Density?:
the mass of an object
the volume of 1 unit of mass. (e.g. the volume of 1 g)
the mass of 1 unit of volume. (e.g. the mass of 1 cm3)
the volume of an object
Answers
Answer:
Density is defined as how tightly or loosely packed a substance is, or to the number of things or people in a certain area.
2. Write the charge of each sub-atomic particle in the helium atom above.
Answers
Explanation:
The charge of a helium atom is zero
It is neutral because
The number of unit negative charges = number of unit positive charges
One unit negative charge = -1.6 x 10^(-19) which is basically the charge of an electron
One unit positive charge = +1.6 x 10^(-19) which is basically the charge of a proton
A helium atom has 2 protons and 2 electrons, so it is neutral
NOTE: an alpha-particle (He2+) is a charged helium atom it has 2 protons and 0 electrons. Charge of an alpha particle = +3.2 x 10^(-19).
explain the classification of elements into block
Answers
Answer:
Explanation:
The elements in the long form of periodic table are classified into four blocks. They are s, p, d and f-block elements. The classification is based on the name of orbitals which receive the last electron. The elements in which the valence shell electron enters the s-orbital are called s-block elements.
4) In the experiment, why do you think they started with water that was the same temp (118 °F) for each
cup?
5) For this experiment, do you think it would it matter if the cups were different sizes, thickness, or had
different amounts of water?
Answers
Answer:
4. I think that they started with water that was the same tsmpurature because if they didnt start with the same temp of water then it would be harder to tell which one was better. and could hold the most heat.
5. yes i think it would matter, because if you have more water in one cup it might stay warmer than it would with the cups with less water, and if it was thicker it would hold mor heat because it is not so thin that the heat is just gonna come out it has to come through more for the heat to get out.
Explanation:
sorry if these are to long but thats how i would answer them.
hope it helped
Which two elements in the d block do not transition and what are their changes when they make ions?
Answers
Answer:
scandium or zinc i think
Explanation:
which of the following is not a characteristic of solution?
A. it is a uniform mixture
B. it will scatter a beam of light
C. it is stable over time
D. the solute and solvent cannot be destinguished by the naked eye
Answers
Which of the following atoms will have the
most similar properties to the atom shown
below
Answers
Answer: IV
Explanation:
Atoms with the same number of valence electrons (in this case 2) will have similar chemical properties.
7) Muscles work to lift a bone in your arm by contracts and relaxes to
help please
Answers
Answer:
By contracting, muscles pull on bones and allow the body to move. When you want to bend your elbow, your biceps muscle contracts, and, at the same time, the triceps muscle relaxes. The biceps is the flexor, and the triceps is the extensor of your elbow joint.
Explanation:
yeah, hope it helps a little. :)
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When preparing a saturated solution of sodium nitrate in water, which of the following actions would speed up the rate of solution?
Select one:
a. Stirring the solution.
b. Evaporating the solvent.
c. Filtering the solution.
d. Cooling the solvent.
Answers
Answer:
a. Stirring the solution.
Which of the following makes its own food using energy from the sun? *
Green algae
Tress
Sunflowers
Answers
Answer: All of the above
Explanation:
All of the options are producers, meaning they make their own food from sunlight through the process of photosynthesis.
help me pwease it's due tomorrow
Answers
Answer:
1. 50 km/hr
2. 5 m/s
3. 180 km/hr 50 m/s
4. 30.56 m/s
5. 11.4 km/hr
Explanation:
#1 500 km/ 10 hours = 50 km/hr
#2 100 m/ 20 s = 5 m/s
#3 540 km/3 hrs = 180 km/hr
180 km/1 hr x (1000 m/ 1 km) x (1 hr/ 60 minutes) x (1 minute/ 60 seconds) = 50 m/s