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inysia [295]
3 years ago
12

The model shown in the diagram describes how the tongue works. When a red block is placed into a the correctly shaped hole, the

nearest bulb lights up. A lit bulb represents a signal being sent to the brain.******According to the model, how does the tongue function?
A) The tongue alerts the brain when food is absent.
B) The tongue changes the shapes of food molecules.
C) The tongue contains special cells for different types of food molecules.
D) The tongue receives information from the brain to determine how food tastes.

Which level of organization is the HIGHEST?
1 point
A) tissue
B) an organ
C) an organism
D) an organ system

Which represents the correct order of cell organization after cellular differentiation (simple to complex)?
1 point
A) organ system→organ→tissue→cell
B) cell→organ→organ system→tissue
C) tissue→cell→organ→organ system
D) cell→tissue→organ→organ system

Cells undergo differentiation during embyonic development. An individual skin cell develops differently from a muscle cell because
1 point
A) the cells have different DNA.
B) the cells have different genes.
C) the cells express different genes.
D) the cells have different chromosomes.
Chemistry
1 answer:
rosijanka [135]3 years ago
6 0

Answer:

d and d

Explanation:

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Calculate the EMF of the following cell at standard conditions (temperature = 25o C, pressure = 1 atmosphere): Ni | Ni2+ | | Cu2
kakasveta [241]

Answer:

a) +0.574 V

b) +0.573V

Explanation:

The EMF is the electromotive force, which is the property of a device that intends to generate electrical current. The EMF of a cell can be calculated by the Nernst equation:

Emf = E° - (0.0592/n)*logQ

Where E° is the standard reduction potential of the cell, n is the number of electrons involved in the reaction, and Q is the reaction quotient ([products]/[reactants]).

In the cell, a redox reaction happens. One substance oxides (lose electrons and become a cation), and the other one reduces (gains electrons and becomes an anion). Each reaction has a reduction potential (E), which indicates how easily is to the reduction happens (as higher E as easy).

For the overall reaction, E° = Ereduction - Eoxidation. To the cell given, Ni is oxidizing, and Cu⁺² is reducing, so, the half-reactions with its E (which can be found at tables), and the overall reaction are:

Ni(s) → Ni⁺² + 2e⁻ E = -0.24 V

Cu⁺² + 2e⁻ → Cu(s) E = +0.337 V

Ni(s) + Cu⁺² → Ni⁺² + Cu(s)

E° = +0.337 - (-0.24)

E° = +0.577 V

As we can see, there're 2 electrons involved in the reaction, so n =2.

The solids don't take place in the Q value, so:

Q = [Ni⁺²]/[Cu⁺²]

a) Q = 0.1/0.08 = 1.25

Emf = 0.577 - (0.0592/2)*log(1.25)

Emf = 0.577 - 0.003

Emf = +0.574 V

b) Q = 0.4/0.3 = 1.33

Emf = 0.577 - (0.0592/2)*log(1.33)

Emf = 0.577 - 0.004

Emf = +0.573 V

3 0
3 years ago
How many moles of iron does 50.0 g of iron (Fe) represents?
mixer [17]

0.9mole of Fe

Explanation:

Given parameters:

Mass of Fe = 50g

Unknown:

Number of moles of iron = ?

Solution:

The number of moles is the particle that contains the avogadro's number of particles.

It is a unit for reporting chemical measurement.

To find the number of moles of a substance;

 Number of moles = \frac{mass}{molar mass}

Molar mass of Fe= 56g/mol

 Number of moles = \frac{50}{56} = 0.9mole of Fe

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

7 0
2 years ago
Consider:
marta [7]

Answer:

The answer is B.

Explanation:

1 mole of AlCl3 = 27 + 3*35.5 grams = 133.5 grams

1 mole / 133.5 = x / 10         Cross multiply

133.5 x = 1 * 10

x = 10 / 133.5

x = 0.0749 moles

Delta H when written the way it is, is on the left side and since it is negative, the reaction must give away 1390.81 kj. The reaction is exothermic.

So now you get the answer between AB and C by setting up a ratio.

2/0.0749 = -1390.81 / x          Cross multiply

2x = 0.0749 * -1390.81

2x =- 104.18                             Divide both sides by 2

2x//2 = -104.18 / 2

x = -52.09

B

3 0
3 years ago
Explain why silver is used to make jewelry based on its properties brainily
myrzilka [38]

\huge \pink \star{ \green{ \boxed{ \boxed{ \boxed{ \purple{ \mathfrak{Answer:⋆ }}}}}}} \pink\star⋆

Silver is used to make jewellery because, It's high luster and reflectivity make it perfect for jewelry, silverware, and mirrors. Its malleability, which allows it to be flattened into sheets, and ductility, which allows it to be drawn into thin, flexible wire, make it the best choice for numerous industrial applications.

\mathfrak\purple {Hope\: this\: helps\: you...}

7 0
3 years ago
In a cooking context, which of the following materials is the best heat conductor?
kkurt [141]
The answer is B. Iron since it heats up the fastest
5 0
3 years ago
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