All categories

3 years ago

I need this all by today because I’m get 0 and my science teacher is being a

Chemistry

2 answers:

Shalnov [3]3 years ago

7 0

The cnidarias life cycle has 2 life cycles polyp and medusa

dmitriy555 [2]3 years ago

7 0

The correct answer is B their life cycle consists of two distinct phases - the polyp and medusa stage.

You might be interested in

several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear is white. What pr

LekaFEV [45]

Explanation:

they are white so they can camouflage, but actually the polar bears skin is black and it's hair is hollow

4 0

3 years ago

Read 2 more answers

Automotive air bags inflate when sodium azide, NaN3, decomposes explosively to its constituent elements. How many moles of nitro

attashe74 [19]

Answer:

2.29 g of N2

Explanation:

We have to start with the chemical reaction:

$NaN_3~->~Na~+~N_2$

The next step is to balance the reaction:

$2NaN_3~->~2Na~+~3N_2$

We can continue with the mol calculation using the molar mass of

$NaN_3$ (65 g/mol), so:

$3.55~g~NaN_3\frac{1~mol~NaN_3}{65~g~NaN_3}=0.054~mol~NaN_3$

Now, with the molar ratio between $NaN_3$ and $N_2$ we can calculate the moles of $N_2$ (2:3), so:

$0.054~mol~NaN_3\frac{3~mol~N_2}{2~mol~NaN_3}=0.0819~mol~N_2$

With the molar mass of $N_2$ we can calculate the grams:

$0.0819~mol~N_2=\frac{1~mol~N_2}{28~g~N_2}=2.29~g~N_2$

I hope it helps!

5 0

3 years ago

Fill in the following table.

Nostrana [21]

Answer:

i cant see the photo but i would love to help

Explanation:

6 0

2 years ago

Which of the following statements correctly describe a photon? Select all that apply.

svetlana [45]

Answer:

I believe it is 3 and 4. I really hope it is but i am positive :)

6 0

3 years ago

How much mass defect is required to release 5.5 x 1020 J of energy?

Montano1993 [528]

Answer : The mass defect required to release energy is 6111.111 kg

Explanation :

To calculate the mass defect for given energy released, we use Einstein's equation:

$E=\Delta mc^2$

E = Energy released = $5.5\times 10^{20}J$

$\Delta m$ = mass change = ?

c = speed of light = $3\times 10^8m/s$

Now put all the given values in above equation, we get:

$5.5\times 10^{20}Kgm^2/s^2=\Delta m\times (3\times 10^8m/s)^2$

$\Delta m=6111.111kg$

Therefore, the mass defect required to release energy is 6111.111 kg

5 0

3 years ago