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3 years ago

Which statement describes how stars are born? Check all that apply

Chemistry

2 answers:

Citrus2011 [14]3 years ago

6 0

Answer:

can you send the answer choices?

Explanation:

faust18 [17]3 years ago

4 0

Answer:

the answers are 1,2,4,5

Explanation:

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7. A cyclist starting from rest accelerates at a rate of 6 m/s until she reaches 30 m/s. How long

Hunter-Best [27]

Answer:

Explanation:

The given values are:

a= 6m/s²

u= 0 m/s

v = 30 m/s

t= ?

The formula is :

$a=\frac{v-u}{t}$

thus,

$t=\frac{v-u}{a}\\t=\frac{30-0}{6}\\t= 5 seconds$

4 0

3 years ago

Question 3 When the population size decreases over time, the total number of births the total number of deaths. O less than O eq

Neporo4naja [7]

The population decreases when the birth rate is less than the death rate.

4 0

3 years ago

How many molecules are there in 0.25 moles of oxygen

givi [52]

Answer:

There are 1.505×1023 molecules in 0.25 moles of oxygen.

5 0

3 years ago

A balloon is filled with 0.250 mole of air at 35°C. If the volume of the balloon is 6.23 liters, what is the absolute pressure o

ruslelena [56]

Answer:

102.807 kPa

Explanation:

There are some assumptions to be made in the answer. The air inside the balloon acts as an ideal gas at a given temperature conditions.

Using the combined ideal gas equation.

$PV = nRT\\$

P= absolute pressure of air inside the balloon.

V= volume of air inside the balloon (6.23 L= 6.23 * 10⁻³ m³)

n= moles of gas(air). (0.250 mol)

R= Universal gas constant ( 8.314 J / mol·K)

T= Temperature in Kelvin

T= 35 + 273.15 = 308.15 K

So, $P = \frac{nRT}{V}$

$P = \frac{0.250 * 8.314 * 308.15}{6.23 * 10^{-3} }$

P= 102.807 * 10³ Pa

P= 102.807 kPa

3 0

3 years ago

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The direction of the electrochemical gradient for Na+ is:

qaws [65]

Answer:

B. the same as the concentration gradient for Na+

Explanation:

The net electrochemical gradient movement of potassium is to move into the cytoplasm of the cell, and the net electrochemical gradient of sodium is to move into the extracellular fluid. There is an overall negative net charge inside the cell than compared to the outside because of this

5 0

3 years ago

Read 2 more answers