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3 years ago

Is your prediction supported by the membrane potential chart? Explain your answer.

Chemistry

2 answers:

LekaFEV [45]3 years ago

7 0

Answer:

The membrane potential of a resting neuron is primarily determined by the movement of K + start text, K, end text, start superscript, plus, end superscript ions across the membrane.Zero voltage across the membrane, as measured by a voltmeter with one electrode inside and one electrode outside the cell.

Hope this answer correct :)

SashulF [63]3 years ago

3 0

Answer:

Yes, it is. The chart shows that the initial charge of the neuron is negative. When the neuron is stimulated, sodium ions enter the cell. So, the voltage inside the cell changes to positive. When potassium ions move outward, the voltage decreases until it reaches its previous state.

Explanation:

answer on edmentum

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The half-life of bismuth-210, 210bi, is 5 days. (a) if a sample has a mass of 184 mg, find the amount remaining after 15 days.

ASHA 777 [7]

Answer:- 23.0 mg

Solution:- Radioactive decay obeys first order kinetics and the first order kinetics equation is:

$lnN=-kt+lnN_0$

where, $N_0$ is the initial amount of radioactive substance and N is it's amount after time t. k is the decay constant.

From given information, Original amount, $N_0$ of the radioactive substance is 184 mg and we are asked to calculate the amount N after 15 days. It means, t = 15 days

Half life is given as 5 days. From the half life, we could calculate the decay constant k using the equation:

$k=\frac{0.693}{t_1_/_2}$

where, $t_1_/_2$ is the symbol for half life. let's plug in the value of half like to calculate k:

$k=\frac{0.693}{5days}$

$k=0.1386day^-^1$

Let's plug in the values in the first order kinetics equation and solve it for N:

$lnN=-0.1386day^-^1(15days)+ln184mg$

$lnN=-2.079+5.215$

lnN = 3.136

$N=e^3^.^1^3^6$

N = 23.0 mg

So, 23.0 mg of Bi-210 would be remaining after 15 days.

3 0

4 years ago

Platinum is used to catalyze the hydrogenation of ethylene: H2(g)+CH2CH2(g)−⟶Pt(s)CH3CH3(g)H2(g)+CH2CH2(g)−⟶Pt(s)CH3CH3(g) Chlor

Dafna1 [17]

Explanation:

Homogeneous catalysis refers to catalytic reactions where the catalyst is in the same phase as the reactants.

Heterogeneous catalysis is the type of catalysis where the phase of the catalyst differs from the phase of the reactants or products.

Platinum is used to catalyze the hydrogenation of ethylene:

H2(g)+CH2CH2(g)− ⟶ Pt(s) CH3CH3(g)

In this reaction, the platinum is in the solid state. While the other species (reactants and products) are in their gaseous state.

This reaction is Heterogenous catalysis.

Chlorofluorocarbons (CFCs) catalyze the conversion of ozone (O3O3) to oxygen gas (O2O2):

2O3(g)− ⟶ CFC(g) 3O2(g)

The catalyst is in the same gaseous state as the reactant and product.

This reaction is Homogenous catalysis.

Magnesium catalyzes the disproportionation of hydrogen peroxide to produce water and oxygen:

2H2O2(aq)− ⟶ Mg(s) 2H2O(l) + O2(g)

In this reaction, the Magnesium is in the solid state. While the other species (reactants and products) are in their gaseous state.

This reaction is Heterogenous catalysis.

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4 years ago

What is the atomic mass of Si in units of amu?

tekilochka [14]

The amu would be 28.0855

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3 years ago

What charge does 3protons 3neutrons 2electrons

cluponka [151]

The charge that 3 protons, 3 neutrons and 2 electrons have is that it will be a cation of Li with a charge of +1.

Li^+1.

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4 years ago

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salantis [7]

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3 years ago