All categories

3 years ago

SCIENTISTS CAN USE SPECTRA ANALYSIS OF STARS TO DETERMINE WHICH OF THE FOLLOWING? SELECT ALL THAT APPLY

Chemistry

1 answer:

monitta3 years ago

4 0

All of the above

Explanation:

Scientists can use spectra analysis of stars to determine:

Surface temperature of the star
Core temperature of stars
Elements in the core of the star
Elements on the surface of the star

Spectra analysis is the analysis or interpretation of the electromagnetic emissions from a matter.

They are very useful in indirect and descriptive studies of astronomical bodies since it might be very difficult of come in close contact with them.

Emissions spectrum typifies every matter in nature since all bodies emits specific radiations.

Using spectra analysis, scientists can determine the temperature that typifies an emission and the elements that might might be producing such signatures.

learn more:

Spectral analysis brainly.com/question/1857156

#learnwithBrainly

You might be interested in

What is the molar mass for 5 mol Na

zimovet [89]

Answer:

22.98977 g/

Brainliest please

4 0

3 years ago

Read 2 more answers

Name the region of the atom where electrons are located.

Alchen [17]

Answer:

The electrons are found on the atomic nucleus.

Explanation:

5 0

3 years ago

Read 2 more answers

Determine the number of atoms in 5.88 moles sodium.

ozzi

1 mole ------------ 6.02x10²³ atoms
5.88 moles ---- ?

atoms = 5.88 * 6.02x10²³ / 1

= 3.539x10²⁴ atoms

hope this helps!

4 0

3 years ago

f 65mL of sulfuric acid and 25mL of sodium hydroxide were mixed and the solution had a density of 1.01g/mL, what is the heat of

user100 [1]

The question is incomplete, here is the complete question:

If 65 mL of sulfuric acid and 25 mL of sodium hydroxide were mixed and the solution had a density of 1.01 g/mL, What is the heat of the calorimeter in kJ given the temperature change of the above equation is -5.5 K. You may assume the solution has a heat capacity of 4.180 J/gK. Express your final answer in kJ and with 2 decimal places

Answer: The heat of the calorimeter is 2.09 kJ

Explanation:

To calculate the mass of solution, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of solution = 1.01 g/mL

Volume of solution = [65 + 25] mL = 90 mL

Putting values in above equation, we get:

$1.01g/mL=\frac{\text{Mass of solution}}{90mL}\\\\\text{Mass of solution}=(1.01g/mL\times 90mL)=90.9g$

To calculate the heat released by the reaction, we use the equation:

$q=mc\Delta T$

where,

q = heat released

m = mass of solution = 90.9 g

c = heat capacity of solution = 4.180 J/g.K

$\Delta T$ = change in temperature = -5.5 K

Putting values in above equation, we get:

$q=90.9g\times 4.180J/g.K\times (-5.5K)=-2089.8J=-2.09kJ$

Heat released by the solution will be equal to the heat absorbed by the calorimeter.

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

Heat absorbed by the calorimeter = -(-2.09) = 2.09 kJ

Hence, the heat of the calorimeter is 2.09 kJ

8 0

4 years ago

Consider the following chemical equilibrium: CaCO3 (s) Cao (s)+cO2 (g) Now write an equation below that shows how to calculate K

True [87]

Answer:

$Kc = Kp/(RT)$

Explanation:

Let's consider the following chemical equilibrium:

CaCO₃(s) ⇄ CaO(s) + CO₂(g)

Given the pressure equilibrium constant Kp = pCO₂

We can calculate the concentration equilibrium constant (Kc) using the following expression.

$Kc = Kp/(RT)^{\Delta n(g)}$

where,

R is the ideal gas constant

T is the absolute temperature

Δn(g) = moles of gaseous products - moles of gaseous reactants = 1 - 0 = 1

The expression for this reaction is:

$Kc = Kp/(RT)$

4 0

3 years ago