All categories

3 years ago

What is meant when it is said that stars have a life cycle?

Chemistry

2 answers:

vodomira [7]3 years ago

6 0

C) Stars get born, get older, then eventually die.

Hitman42 [59]3 years ago

6 0

C) Stars get born, get older, then eventually die. TFMOONING gets Brainliest!!

You might be interested in

Can someone help me? <br><br>-just check my latest question.. thanks...

Harman [31]

Explanation:

${\boxed{ \fbox{ \fbox{ \fbox{ \red{hello}}}}}}$

${\boxed{ \fbox{ \fbox{ \fbox{ \green{hello}}}}}}$

${\boxed{ \fbox{ \fbox{ \fbox{ \pink{hello}}}}}}$

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{green}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{blue}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{red}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{gray}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

$\mathscr \fcolorbox{blue}{pink}{BE \: BRAINLY}$

7 0

2 years ago

Assuming complete dissociation, what is the ph of a 3.24 mg/l ba(oh)2 solution?

weqwewe [10]

We need to first find the molarity of Ba(OH₂) solution.
A mass of 3.24 mg is dissolved in 1 L solution.
Ba(OH)₂ moles dissolved - 3.24 x 10⁻³ g/171.3 g/mol = 1.90 x 10⁻⁵ mol
dissociaton of Ba(OH)₂ is as follows;
Ba(OH)₂ --> Ba²⁺ + 2OH⁻
1 mol of Ba(OH)₂ dissociates to form 2OH⁻ ions.
Therefore [OH⁻] = (1.90 x 10⁻⁵)x2 = 3.8 x 10⁻⁵ M
pOH = -log[OH⁻]
pOH = -log (3.8 x 10⁻⁵)
pOH = 4.42
pH + pOH = 14
therefore pH = 14 - 4.42
pH = 9.58

6 0

3 years ago

Can someone help answer this? thanks!

Naya [18.7K]

Explanation:

Surface tension is the energy required to increase the surface area of a liquid by a given amount. The stronger the intermolecular interactions, the greater the surface tension. ... The viscosity of a liquid is its resistance to flow. Liquids that have strong intermolecular forces tend to have high viscosities.

The surface tension in plain water is just too strong for bubbles to last for any length of time. ... This separates the water molecules from each other. Since the surface tension forces become smaller as the distance between water molecules increases, the intervening soap molecules decrease the surface tension.

3 0

3 years ago

8. Based on the formula, predict whether each of the following compounds is primarily ionic or primarily covalent. a. sodium iod

Lina20 [59]

primarily ionic include = sodium iodide( NaI) , calcium chloride ( CaCl2)

primarily covalent include - Ammonia (NH3) , Methane ( CH4) and

Glucose (C6H12O6)

Explanation

ionic bond is formed when there is complete transfer of electron between atoms. It occur between metal which donate electrons and a non metal which accept electrons.

for example in formation of CaCl2, ca donate 2 electron to 2 Cl atom, while 2 Cl atom accept the 2 electrons to form ionic bond.

Covalent bond is formed when two or more non metal form bond by sharing electrons pairs.

For example in NH3 3 pairs of electron are shared. to form covalent bond.

8 0

3 years ago

A drum used to transport crude oil has a volume of 162 L. How many grams of water, as steam, are required to fill the drum at 1.

Paraphin [41]

Answer:

114.48g

Explanation:

Step 1:

Data obtained from the question:

Volume (V) = 162 L

Pressure (P) = 1.20 atm

Temperature = 100°C = 100°C+ 273 = 373K

Number of mole (n) of H2O =?

Recall:

Gas constant (R) = 0.082atm.L/Kmol

Step 2:

Determination of the number of mole of H2O i.e steam.

Using the ideal gas equation, the number of mole of H2O can be obtained as follow:

PV = nRT

1.2x 162 = n x 0.082 x 373

Divide both side by 0.082 x 373

n = (1.2x 162) /(0.082 x 373)

n = 6.36 moles

Step 3:

Determination of mass of H2O i.e steam:

This is illustrated below:

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Number of mole H2O = 6.36 moles

Mass of H2O =?

Mass = number of mole x molar Mass

Mass of H2O = 6.36 x 18

Mass of H2O = 114.48g

Therefore, the mass of H2O i.e steam required to fill the drum of crude oil is 114.48g

7 0

3 years ago