What keeps the cell together and controls what goes into and out of the cell?
Answers
Related Questions
A liquid mixture in which particles can be seen and easily separated by settling or filtration is aa. solution. b. suspension. c. solvent. d. solute.
What type of fault usually occurs because of tension?a. folded c. strike-slip b. normal d. reverse
What form of energy provides power for a gas stove?A.nuclear energyB.electrical energyC.chemical energyD.sound energyCan you explain the answer for me ?
2H2 + O2 --> 2H2O can be classified as what type of reaction? A. Both synthesis and combustion. B. Only synthesis. C. Only combustion. D. It cannot be classified.
Answers
B) Any oxygen atom contains 8 electrons and 9 neutrons but these vary in the number of protons - 8 and 10 respectively.
C) The oxygen allotropes contain 8 electrons but each contains a different number of neutrons and protons - 8 and 10 respectively.
D) Both oxygen isotopes contain 8 electrons and 8 protons but each contains a different number of neutrons - 8 and 10 respectively.
Copper has been used in electrical wiring for two hundred years. Identify which molecular level property does not contribute to copper's usefulness a material for wiring. A) high ductility B) high malleability C) high conductivity D) high crystallinity
Describe how light is emitted from an atom.
A) As protons absorb energy they travel from the nucleus through the atom emitting light along the way.
B) The light is emitted when energy from sunlight is absorbed by the atom to excite a neutron into a higher level.
C) When the nucleus absorbs sunlight, photons are energized and move to a higher energy level and are then released.
D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.
During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless final solution as shown by the chemical equation.
Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)
What physical evidence indicates that there has been a chemical reaction?
A) The solution changes color.
B) Precipitate formation occurs.
C) The beaker changes temperature.
D) Gas bubbles form during the reaction.
Answers
Answers
Answer:
Explanation:
Hello,
In this case, chlorine's percent composition is given by the shown below formula:
Whereas accounts for the number of chlorine atoms into the NaCl,
for chlorine's atomic mass and
for sodium chloride's molar mass, therefore, the percent composition of chlorine turns out:
Best regards.
Answers
Answers
Answer:
54.2 g of Ca(OH)₂
Explanation:
Let's determine the moles of solute, we should need
Molarity . volume (L) = moles
Let's convert 600 mL to L
600 mL/ 1000 = 0.6L
1.22 mol/L . 0.6L = 0.732 moles
Finally we must convert the moles to mass ( moles . molar mass)
0.732 mol . 74.08 g/mol = 54.2 g
Answer: 54.2 g Ca(OH)2
Explanation: Molarity is moles of solute / L solution
First convert mL to L
600 mL x 1L / 1000 mL = 0.6 L
Find moles of Ca(OH)2
n= M x L
= 1.22 M x 0.6 L
= 0.732 moles Ca(OH)2
Convert moles to mass using its molar mass of Ca( OH)2 = 74 g
0.732 moles Ca(OH)2 X 74 g Ca(OH)2 / 1 mole Ca(OH)2
= 54.2 g Ca(OH)2
b. climax
c. details
d. explanation
Answers
Answer:
The climax is not a part of a story
Explanation:
The structure of a story consists of three parts:
1.-The lead or the entrance. Main data of the news is presented.
2.-The body. Where it is explained how the events occurred.
3.-The closure. Complementary ideas are presented.
The news is a text whose function is to report a topic or fact. It is characterized by being topical and of public interest. It consists of three parts: input or lead, body and closure. The lead is the core of the news, the most important of the information, where a small summary of what the news will deal with is presented. The body expands the information that was anticipated in the lead by providing new data. And finally the closing, where the information of the news is complemented with some final ideas.