What controls which substances can move into and out of a cell?

Answers

Answer 1

Answer: the cell wall and nucleus

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A physical change is __________ if energy is given off.Select one:a. exothermicb. endothermicc. a chemical changed. not possible
Which statement regarding significant figures is false? a. Zeros can be significant b. When multiplying, the answer is determined by the number of significant figures c. When adding, the answer is determined by the number of decimal places d. When dividing, the answer is determined by the number of decimal places e. The number 50,004 has five significant figures
Why do ionic bonds have strong intermolecular forces? (Imfs)&Why do covalent bonds have weak intermolecular forces? (Imfs)
Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85% ethanol and 15% gasoline.State the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane.Identify the functional group in a molecule of ethanol in the alternative fuel E-85.

A particle that orbits the nucleus in an atom is called an

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Good Morning

Answer : A particle that orbits the nucleus in an atom is called an Electron

Hint : Electron, negatively charged particle orbiting the nucleus. Same number as protons in neutral atoms

I hope that's help !

Happy Sunday :)

This would be a proton.It has a positive charge and is found in the nucleus. Don't get it confused with an electron this is not inside the nucleus but floats around the nucleus.

A 1170.-gram sample of NaCl() completely reacts, producing 460. grams of Na(). What is the total mass of Cl2(g) produced?

Answers

2 NaCl --------> 2 Na + Cl₂

2 mol * 23 g Na = 46 g

2*35,5 g Cl = 71

46 g Na --------- 71 g Cl₂
460 g Na -------- ?

mass ( Cl₂) = 460 . 71 / 46

Mass (Cl₂) = 32660 / 46

m= 710 g of Cl₂

hope thips helps

A gas Syringe contains 42.3 milliliters of a gas at 98.15°C. Determine the volume that the gas will occupy if the temperature is decreased to -18.50°C.

Answers

The volume that the gas will occupy is "29.00 mL".

According to the question,

Volume,

$V_1 = 42.3 \ mL$
$V_2 = ?$

Temperature,

$T_1 = 98.15^(\circ) C$

$= 371.15 \ K$

$T_2 = -18.50^(\circ) C$

$= 254.5 \ K$

As we know the relation,

→ $(V_1)/(T_1) = (V_2)/(T_2)$

or,

→ $V_2 = (V_1* T_2)/(T_1)$

By substituting the values, we get

→ $= (41.3* 254.5)/(371.15)$

→ $= (10765.35)/(371.15)$

→ $= 29.00 \ mL$

Thus the above answer is right.

Learn more:

brainly.com/question/22590663

V₁ = 42.3 mL

T₁ ( K ) = 98.15ºC + 273 = 371.15 K

V₂ = ?

T₂ ( K) = -18.50ºC + 273 = 254.5 K

V₁ / T₁ = V₂ / T₂

42.3 / 371.15 = V₂ / 254.5

371.15 x V₂ = 42.3 x 254.5

371.15 x V₂ = 10765.35

V₂ = 10765.35 / 371.15

V₂ = 29.00 mL

hope this helps!

When making a guess, you are forming a_______. Can you help me complete this sentence??!?!!?

Answers

When making a guess, you are forming a hypothesis.

A hypothesis is a statement you make based on your observations of a certain phenomenon, so it's an educated guess.

You will then carry out an experiment whose results will hopefully support your hypothesis.

Explanation:

Hypothesis is a supposition or projected clarification created on the premise of restricted proof as a place to begin for more investigation.A hypothesis may be a tentative, testable answer to a scientific question. Once a person encompasses a scientific question she is fascinated by, the person reads up to search out out what's already far-famed on the subject. Then she uses that data to make a tentative answer to her scientific question. Typically folks discuss with the tentative answer as "an educated guess."

When making a guess, you are forming a hypothesis. A hypothesis is a statement you make based on your observations of a certain phenomenon, so it's an educated guess. You will then carry out an experiment whose results will hopefully support your hypothesis.

When a bond is formed, energy is _________ the environment.A. released into
B. released from
C. kept stable in

Answers

When a bond is formed, energy is released into the environment. That is because it is an exothermic reaction, it releases energy.

Answer: can confirm that A: Released into. Is the correct answer

What produces hydrogen ions as The only positive ions in aqueous solution

Answers

Mostly acids produces H+ ions. Acids dissociates into ions when in aqueous form resulting to hydronium or hydrogen ions and the other ion which has a negative charge. For instance, hydrochloric acid, it dissociates into H+ and Cl-.

Other Questions

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Choose the letter of the choice that best completes the statement or answers the question. Elements in the same group have the same __________. A. atomic radius B. energy level of outer electrons C. nuclear charge D. number of valence electrons

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Which lists the elements in order from least conductive to most conductive?A. nitrogen (N), antimony (Sb), bismuth (Bi)B. nitrogen (N), bismuth (Bi), antimony (Sb)C. antimony (Sb), nitrogen (N), bismuth (Bi)D. bismuth (Bi), antimony (Sb), nitrogen (N)