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liraira [26]
3 years ago
7

Object A at 40ºC and object B at 80ºC are placed in contact with each other. Which statement describes the heat flow between the

objects?
A)Heat flows from object A to object B.B)Heat flows from object B to object A.C)Heat flows in both directions between the objects.D)No heat flow occurs between the objects.
Chemistry
2 answers:
Arada [10]3 years ago
6 0
By the second law of thermodynamics:
Heat can not spontaneously flow from cold regions to hot regions without external work being performed on a system.
Heat transfer is the passage of thermal energy from a hot ( t B = 80° C ) to a colder body ( t A = 40° C ). 
Answer:  B ) Heat flows from object B to object A.
ozzi3 years ago
5 0
Option B is right that is Heat flows from object <span>B </span>to object because if 2 bodies have different temperature so heat always transfer from higher to lower ,from hot to cold .
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Which law states that the volume and absolute temperature of a fixed quantity of gas are directly proportional under
Radda [10]

Answer:

O Charles's law .

Explanation:

Hello!

In this case, since the use of gas laws leads to a good comprehension of how gases behave towards volume, pressure and temperature, we can review that the Boyle's law explains the pressure-volume variation, the Dalton's law the partial pressure effect, the Gay-Lussac's law that of pressure and temperature and the Charles' that of temperature and volume at constant pressure; thus, the answer for the asked question is:

O Charles's law

Best regards!

8 0
3 years ago
Place the steps of the action potential in order.
Ierofanga [76]

Answer:

-Reversal of the resting potential due to influx of sodium ions

-Mechanism that restores the resting membrane voltage and intracellular ionic concentrations

-Period during which potassium ions are diffusing out of the neuron because of a change in membrane permeability

-A brief reversal of membrane potential that travels along the axon

Explanation:

An action potential is a situation where the membrane potential is briefly reversed from -70mV to +30 mV

There are three steps of the moving action potential, including;

1) The depolarization step, where the membrane resting potential is reversed by the rush of sodium ions into a neuron

2) The repolarization, due to the closing of the voltage-gated sodium channels and the opening of the potassium channels, which is a mechanism that restores the membrane's resting voltage and the ionic concentration in the cell

3) Hyperpolarization, where due to some open potassium channels, there is an increased potassium permeability, and excessive efflux of potassium ions take place, which results in a dip in the membrane potential

4) The above three phases describe the phase of the action potential which is the brief reversal of membrane potential that travels along the axon

7 0
3 years ago
What mass of sulfur has to burn to produce 4.5l so2 at 300°c and 101kpa s(s) o2(<br> g. so2(<br> g.?
Mandarinka [93]
S + O2 --> So2. P = 101kPa = 1atm. R = 0.082 atm - L - (mol-K)^-1. Applying ideal gas equation PV = nRT. n = 1x4.5/0.082x573 = 0.096mole. According to stoichiometry, moles of S = moles of SO2 = 0.096mol. Mass of S = moles of So2 x molar Wt = 0.095x32 = 3.04moles. Hope it helps
8 0
3 years ago
A virulence study was performed using Staphylococcus aureus in mice. It was determined that the LD50 for the S. aureus alpha-tox
KATRIN_1 [288]

Answer:

S. aureus strain is less infectious, but its alpha-toxin is highly-toxic.

Explanation:

Given data:

LD50 for S. aureus alpha toxin 0.45 \mu g/kg

ID50 for same mouse density found to be 200,000

From the data information given above Staphylococcus aureus was done on mice. The result show that LD50 is found to be 0.45\mu g/kg and ID50 found to be 200,000 on same mouse population

the result taken together mean that S. aureus strain is less infectious, but its alpha-toxin is highly-toxic.

4 0
3 years ago
Differences in ocean water density are larger at low latitudes near the equator because the water temperature changes often thro
andriy [413]

The density is the mass of a substance per unit volume. The surface water density is higher at the poles, and lower at the equator. Thus, the statement is false.

<h3>What is the relation between density and latitude?</h3>

The latitude is the distance from the poles. As moving down from the equator, the temperature increases. The increase in temperature at the equator allows larger mass to accumulate in a unit volume of water.

The larger mass-to-volume ratio results in the increased density of the water.

Thus, the ocean water has a higher density at the equator than poles, due to temperature differences. Therefore, the given statement is false.

Learn more about surface water density, here:

brainly.com/question/2968053

8 0
2 years ago
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