CHEMISTRY HIGH SCHOOL

Which structural adaptation do some plants have to attract pollinators? A.small leaves
B.deep roots
C.hard bark
D.colorful flowers

Answers

Answer 1
Answer: d colorful flowers!!!!!!!!!!!!!!!
Answer 2
Answer: I know this is a late answer, but I was just here to look at my answer for a test, but i couldn't find it, so i guessed and it turns out i was right! The answer is D.Colorful flowers

Related Questions

 Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will conduct an electric current. When an electrolyte forms into a solution, it dissolves or dissociates into ions, a process called ionization. If a substance does not ionize, it will not conduct an electric current. Electrolytes include most acids, bases, and salts. Some conductors include hydrogen and sodium chloride, copper sulfate, and potassium nitrate. Substances that are not electrolytes include distilled water, sugar water, and most organic compounds. Which of the following is a non-electrolyte?  A) H 2 SO 4 (sulfuric acid)B) HCL (hydrochloric acid)C) C 3 H 8 (propane gas)D) NaCl (table salt)
Which atomic model was proposed as a result of J. J. Thomson’s work?
A physical property is one that cannot be observed can be observed by altering the identity can be changed without altering the identity of a substance must be observed through chemical means
Write the balanced equation for the reaction given below: C2H6 + O2 --> CO2 + H2O. If 16.4 L of C2H6 reacts with 0.980 mol of O2, how many liters of carbon dioxide gas will be produced? What is the limiting reagent? How many oxygen atoms will be in this sample of carbon dioxide? How many moles of the excess reactant will be left over? How many grams of the excess reactant will be left over?
How many grams are in 11.9 moles of chromium?

Which of the following ions has the smallest radius? (1) F– (3) K (2) Cl– (4) Ca2

Answers

(1) is the correct answer.

(2) Cl- is larger than F- due to having more electron shells
(3) Is not an ion
(4) Is not an ion either.

Starting with 100 grams of uranium-238, after one half life has gone by, how many grams of uranium-238 will remain?A._12.5 grams
B._25 grams
C._50 grams
D._100 grams

Answers

Answer : The correct option is, (C) 50 grams

Solution :

Formula used :

a=(a_o)/(2^n)

where,

a = amount of reactant left after n-half lives = ?

a_o = Initial amount of the reactant = 100 g

n = number of half lives  = 1

Putting values in above equation, we get:

a=(100)/(2^1)

a=50g

Therefore, the amount of uranium-238 remain will be, 50 g
Answer C, 50 grams.
This is because a half life is the time it takes for a sample of an unstable isotope to spontaneously so that half of the original sample remains

For any given reaction, which of the following will speed up the reaction rate? a)increase the temperature
b)add a catalyst
c)increase the surface area
d)All of the choices are correct.
e)None of the choices are correct.

Answers

All of the choices are correct.  Catalysts increase reaction rate by lowering the activation energy of a reaction.  When you increase both the temperature and surface area you are just increasing the number of collisions which also increases the reaction rate since the reaction happens when molecules or atoms collide in the correct orientation and with enough energy and you are increasing the number of times that happens in a given time period.

I hope this helps.  Let me know in the comments if anything is unclear.

Which of the following processes are exothermic and which are endothermic? a) frost forms on a car window in winter; b) water condenses on a glass of ice water on a humid summer afternoon; c) adding ammonium nitrate to water causes the temperature of the solution to decrease

Answers

Endothermic reactions are reactions that proceed by the absorption of heat (energy) while exothermic reactions involve a release of energy.

a) Formation of frost on a car window in winter is an exothermic process as heat is liberated when liquid water freezes to form crystals

b) Formation of water condensate on a glass of ice water is an endothermic reaction since heat is absorbed by the cold water from the glass container thereby cooling it.

c) A decrease in the temperature as ammonium nitrate is added to water is an endothermic reaction

a) and b) are exothermic processes because they release heat to the surroundings. c) is an endothermic process because it absorbs heat from the surroundings.

Which of the following processes are exothermic and which are endothermic?

Let's analyze each option:

a) Frost forms on a car window in winter: Exothermic

Frost forming is an exothermic process because it releases heat as water vapor in the air condenses and freezes on the cold car window, giving off energy in the form of heat to the surroundings.

b) Water condenses on a glass of ice water on a humid summer afternoon: Exothermic

Similar to the first scenario, water condensation is exothermic. As water vapor from the humid air comes into contact with the cold glass of ice water, it condenses into liquid water, releasing heat to the surroundings.

c) Adding ammonium nitrate to water causes the temperature of the solution to decrease: Endothermic

This process is endothermic because dissolving ammonium nitrate in water absorbs heat from the surroundings, causing the temperature of the solution to decrease.

Learn more about exothermic and endothermic processes:

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According to the cell theory, which of the following is NOT composed of cells?a- algae
b-iron
c- bacteria

Answers

Answer:

Iron

Explanation:

cause i am big brain

Using the half-reaction method, balance the following redox reaction occurring in acidic solution:Ag + NO3- -> Ag+ + NO

Answers

to solve this half-reaction method, we divide the reaction into two equations- reduction and oxidation side. The oxidation is simply Ag= Ag+ + e-. The reduction side is 4H+ + NO3-+e-=NO+2H20. H2O is used to balance O and H+ is used to balance H. Hence the final equation is Ag+4H+ + NO3-= NO+2H2O. 
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Which of the following is a measure of randomness in a system?A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.