Answer:
Summer.
Explanation:
Plants we see as ferns or horsetails are the sporophyte generation. The sporophyte generally releases spores in the summer. Spores must land on a suitable surface, such as a moist protected area to germinate and grow into gametophytes.
Answer:
they generally form during the summer.
Explanation:
hope I helped. :)
10 points
What is the molar mass of argon?
Answer:
39.948 u
Explanation:
True or False: Different substances, like shortening and soap, will melt at the same temperature. True False
Answer:
false
Explanation:
different things will have different melting points
HELP IS IT:
A.
Model 2 is an isotope; Model 3 is an ion
B.
Model 1 is an ion; Model 3 is an isotope
C.
Model 1 is an isotope; Model 2 is an ion
D.
Model 1 is an ion; Model 2 is an isotope
Answer:
i thjink its b
Explanation:
please help as soon as possible!
Answer:
1st one
Explanation:
Answer:
B
Explanation:
chlorine 2×3= 6 not sure
Write the information provided by a balanced equation.
Answer:
2 Fe 2O 3 + 3 C → 4 Fe + 3 CO 2
Explanation:
yeap
what is valency pls i need it now
What are examples of physical properties of substance? Select all that apply. A Solubility B Odor C Color D Flammability
Solubility, odor, and color are physical properties; they can all be discerned without having to subject a substance to a chemical change. Flammability, on the other hand, is a chemical property. Thus, choices A, B, and C would be correct examples of physical properties.
Are humans more similar to trees or bacteria? How do you know?(1 point)
A
Humans are more similar to bacteria because trees cannot move around their environment.
B
Humans are more similar to trees because bacteria are too small to see.
C
Humans are not similar to trees or bacteria. Humans are a special species that is not related to any other species on Earth.
D
Humans are more similar to trees because all plants and animals are part of the same domain.
Answer:
Humans and trees are interdependent - we breathe in oxygen and breathe out carbon dioxide, while trees take in carbon dioxide and release oxygen.
Humans have about a thousand genes similar to those of bacteria, presumably because the genes are so vital that their DNA structure has remained much the same over millions of years of descent from a common ancestor.
Explanation:
Why is balance important in organisms?
Consider the following representation of a reaction mechanism.
Step 1: A+A → C+E (slow)
Step 2: E + B → A+D (fast)
Overall reaction: A + B → C + D
What should appear in the rate law for the reaction above?
A) only A and B because they are reactants in the overall reaction
B) only C and C because they are products in the overall reaction
C) only A because it is the reactant in the rate-determining step
D) only E and B because they are the reactants in the rate-determining step
Answer:
The rate determining step is step 1
Explanation:
In the rate law for the given reaction,
only A appears because it is the reactant in the rate-determining step.So, option C is correct one.
Which step is rate determining steps?The slowest steps is rate determining step of the reaction.It is because in rate determining step the intermediate is formed.What is intermediate ?The short lived species formed in the mechanism of reaction is called intermediate.The intermediates is formed in slowest step because it is unstable species.What is rate law for the reaction?The rate law is also known as rate equationIt is the expression that provides relationship between rate and concentration of the reaction in a chemical reaction.The rate law is determined by the experimentally.If the reaction occurs in multi steps then the rate of the reaction is depends upon slowest step of the reaction.learn about rate law,
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Which type of molecule is shown below?
The type of molecule is to be considered as the option a. Alkyne. And, the same is to be considered.
What is alkyne?In terms of the chemical compound, Alkynes refer to Molecules which comprise of the triple bond that arise between 2 carbon atoms.
Also, the triple bond should be made up of one σ bond and two π bonds.
hence, The type of molecule is to be considered as the option a. Alkyne. And, the same is to be considered.
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Which is the mass of 0.13 moles of potassium chloride, KCl
Answer:
9.69 grams
Explanation:
e
Answer:
9.69g KCl
Explanation:
[tex]0.13 molesKCl\frac{74.55gKCl}{1moleKCl} =9.69gKCl[/tex]
2) Which of the following statements are true about energy and matter?
The transfer of energy through empty space can be by radiation.
Conduction is heat transfer by direct contact of particles of matter.
Conduction is the transfer of heat by the movement of a heated fluid.
Density is a measure of how much mass there is in a volume of a substance.
The movement of energy from a warmer object to a cooler object is called heat
transfer.
Answer:
the transfer through empty space can be radiation
Explanation:
because when it transfers it turns into radiation
Use the information in the table to calculate ASrxn
for each of these reactions. Round all answers to
nearest whole number.
Answer:
-198
-5
-148
Explanation:
The entropy of a system is usually denoted by the symbol 'S'. The change in entropy is given as ΔS. It is generally expressed in JK⁻¹mol⁻¹.
What is entropy?The entropy is defined as the property of a system which measures the disorder or randomness of the system. Like internal energy and enthalpy entropy is a state function and it is also an extensive property.
The change in entropy is given as:
ΔS reaction = S-Products - S -Reactants
1. ΔS = (2 × 192.5 - (3 × 130.58 + 191.50) = -198.24 J/K
2. ΔS = (213.6 + 2 × 188.83) - 186.3 + 2 × 205.0 = -5.04 J/K
3. ΔS = (2 × 220.0) - (2 × 191.50 + 205.0) = -148 J/K
For spontaneous process in isolated systems, the entropy change is positive. The greater the disorder in a system, the higher is the entropy. The solid state has lower entropy.
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6) What causes the stars to give off light when ignited?
Answer:
When fireworks explode in the sky, the gunpowder reactions create a lot of heat, causing the metallic substances pres- ent in the stars to absorb energy from the heat and emit light. ... These electrons absorb energy from the heat, which causes them to move from their original ground-energy state to an excited state.
Explanation:
:))
The process which generates energy in sun and other stars is nuclear fusion. The emission of light energy is thus the result of fusion reaction taking place in stars.
What is nuclear fusion?Nuclear fusion is a chemical process in which two light nuclei or isotopes of an atom fuse together to form a heavy nuclei with the release of million tons of energy.
The process in which a heavy atom breaks into lighter atoms is called nuclear fusion and it is also releasing massive energy but less than the from fusion because, the breaking of chemical bonds needs some energy to absorb.
Fusing two chemical bonds is needs no more energy and it is an energy releasing process. Millions of hydrogen atoms and its isotopes fuse together in several steps and form helium atoms.
This process of release million tons of heat energy and light energy. This will make the stars glow.
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What is the percent by mass (mv) of a solution with 1.56 g of benzene dissolved in gasoline to make 998.44 mL of solution? (density of gasoline = 0.7489 g/mL)
please I need help lol
Answer:
The percentage by mass of benzene in the solution is approximately 0.2%
Explanation:
The given parameters are;
The mass of the benzene solute dissolved in the gasoline solvent, m₁ = 1.56 g
The total volume of the benzene gasoline solution made, V = 998.44 mL
The density of gasoline, ρ = 0.7489 g/mL
Mass, m = Density, ρ × Volume, V
∴ The mass of gasoline in the 998.44 mL, solution = 0.7489 g/mL × 998.44 mL = 747.731716 g
The total mass of the solution = The mass of the benzene in the solution + The mass of the gasoline in the solution
∴ The total mass of the solution = 747.731716 g + 1.5 g = 749.231716 g
[tex]The \ percentage \ by \ mass = \dfrac{The \ mass \ of \ a \ fraction}{(The \ mass \ of \ the \ total \ solution)} \times 100[/tex]
The percentage by mass of benzene in the solution = (1.5 g/749.231716 g)×100 ≈ 0.2% by mass.
What are 2 facts about neon
If a 60 kg object is moving at a velocity of 10 m/s and it's 25 meters high off the ground what would if mechanical energy be?
Answer:
Like all questions in this sublevel, the work done by non-conservative forces must be related to the changes in energy of the object (see Physics Rules section above). In the case of the car skidding to a stop, the kinetic energy equation (see Formula Fix section below) can be used to determine the initial and final kinetic energy of the car. Since the car is on the ground, the height and potential energy can be regarded as zero.
Explanation:
Solve and show work. Li2S + 2 HNO3 --> 2 LiNO3 + H2S (a) Calculate the mass of lithium sulfide that will react with 250 mL of 0.65 M nitric acid (b) How many mL of 9.6 M HNO3 are needed to make 250 mL of 0.65 M HNO3 solution? (c) How many grams of nitric acid are needed to make 750 mL of 9.6 M HNO3.
Li2S + 2 HNO3 --> 2 LiNO3 + H2S
Li2 S + H2 N2 O2 --> Li2 N2 O5 + H2 S
Li S + H2 N2 O5 -> Li N2 O5 + H2 S
Li2 S2 + H4 N4 O10 --> Li2 N4 O10 + H4 S2
Li^2 S^2 + H^4 N^4 O^10 --> Li^2 N^4 O^10 + H^4 S^2
How many molecules are in 5.60 L of oxygen gas
Answer:
5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.
PLSSS HELP
How is a balanced chemical reaction, like N2 +
3H2 --> 2NH3, similar to a recipe?
Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.
Explanation:
4 Which pair of ions is isoelectronic?
A Ca2+ and 02-
B Na+ and 02-
OC Lit and Cl-
OD Mg2+ and CI-
Answer:
B. Na+ and O2-
Explanation:
Na+ plus has 10 electrons and O2- also has 10 electrons
366 Cal to kilowatt-hours, how to convert?
Answer:
0.000425 kilowatt hour
Identify the elements that make up water and ozone .Name the element common between the two molecules .
Answer: Water is made up of elements hydrogen and oxygen. Ozone is made up of element oxygen. The common element between them is oxygen.
Explanation:
Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions.Example: Hydrogen (H)
Water and ozone are compounds which are formed by the combination of elements in fixed ratio by mass.Water and ozone have molecular formulas of [tex]H_2O[/tex] and [tex]O_3[/tex] respectively.Water is made up of elements hydrogen (H) and oxygen (O). Ozone is made up of element oxygen (O).
Thus the common element between them is oxygen (O).
How many molecules of HCl would react with 2 moles of Al?
2Al + 6HCl → 2AlCl3 + 3H2
Answer:
3.612 × 10^24 molecules
Explanation:
The balanced chemical equation in this question is given as;
2Al + 6HCl → 2AlCl3 + 3H2
Based on the equation, 2 moles of Aluminum (Al) is needed to react with 6 moles of HCl
Since 1 mole of a substance is equal to 6.02 × 10^23 molecules;
This means that, according to the question, 6 moles of HCl needed to react with 2 moles of Al will contain;
6 × 6.02 × 10^23 molecules
= 36.12 × 10^23
= 3.612 × 10^24 molecules
In a nutshell, 3.612 × 10^24 molecules of HCl would react with 2 moles of Al.
Answer:
1.806 × 10^24
Explanation:
How many neutrons does calcium have?
.20. 60. 79. 40
Answer:
20
Explanation:
Atomic number/proton number = 20 (protons in nucleus)
Atomic mass number = 40 (protons + neutrons in nucleus)
40 - 20 = 20
Which of the following is the correct chemical equation and is properly balanced for:
Iron III oxide reacts with potassium iodide to produce iron III iodide and potassium oxide
Answer:are there any abc or do you have to make an answer?
Explanation:
HELP ASAP Will Give Brainlist
The correct answer is actually
D. requires a lot of energy to become hot.
As the definition of specific heat is "the heat required to raise the temperature of the unit mass of a given substance by a given amount."
Calculate the reaction rate given the following:
After 2 minutes (120 seconds), the concentration of a product was measured to
increase from 0.0012 M to 1.48 M.
1.48 M/s
0.0123 M/s
0.0012 M/s
-0.0123 M/s
Answer:
0.0123 M/s
Explanation:
The reaction rate is the rate at which the reaction takes place and results in an increased concentration of the products. The rate of the reaction is 0.0123 M/s.
What is the reaction rate?
The reaction rate is the increase of the concentration of the product with respect to time in seconds. The rate of reaction is given by,
[tex]\rm rate = \rm \dfrac {\Delta C}{\Delta t}[/tex]
Given,
Change in product concentration = 1.478
Time period = 120 seconds
Substituting values in the above equation:
[tex]\begin{aligned} \rm rate &= \rm \dfrac {\Delta C}{\Delta t}\\\\& = \dfrac{1.478}{120}\\\\&= 0.0123 \end{aligned}[/tex]
Therefore, option B. 0.0123 M/s is the reaction rate.
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Thanks in advance
Answer:
3.6 moles
Explanation:
The balanced equation for the reaction is given below:
N₂ + 3H₂ —> 2NH₃
From the balanced equation above,
1 mole of N₂ reacted with 3 moles of H₂ to produce 2 moles NH₃.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
1 mole of N₂ reacted with 3 moles of H₂.
Therefore, 3.2 moles of N₂ will react with = 3.2 × 3 = 9.6 moles of H₂.
From the calculation made above, we can see that it will take a higher amount (i.e 9.6 moles) of H₂ than what was given (i.e 5.4 moles) to react completely with 3.2 moles of N₂.
Therefore, H₂ is the limiting reactant and N₂ is the excess reactant.
Finally, we the greatest quantity of ammonia, NH₃ produced from the reaction.
In this case, the limiting reactant will be use because all of it is consumed in the reaction.
The limiting reactant is H₂ and greatest quantity of ammonia, NH₃ produced can be obtained as follow:
From the balanced equation above,
3 moles of H₂ reacted to produce 2 moles NH₃.
Therefore, 5.4 of H₂ will react to produce = (5.4 × 2)/3 = 3.6 moles of NH₃
Thus, the greatest quantity of ammonia, NH₃ produced from the reaction is 3.6 moles