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2 years ago

9

11.You run 100 m in 25 s. If you then run the same distance in less time, does your aver- age speed increase or decrease? Explai

n.

1 answer:

Sergeu [11.5K]2 years ago

5 0

Ur average speed increases bc ur moving faster

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Could you please help

Semenov [28]

I would say D, because you need to start with nothing to measure the different sizes as they start to grow. hope this helps!

8 0

3 years ago

Energy is released when the nucleus of an atom splits and two smaller atoms are formed. What is the name of this process?

Svetllana [295]

Explanation:

It's (D), nuclear fission................

5 0

2 years ago

Write a balanced equation formed when the following elements react with oxygen:a)Zinc

Ainat [17]

Explanation:

a) when zinc burnt in oxygen.

2Zn + O2 -----∆-----> 2ZnO(black residue)

b) when carbon burnt in oxygen.

C+O2----∆---> CO2.

c) when sulphur burnt in oxygen.

S+O2-----∆-----> SO2.

d) when Calcium burnt in oxygen.

2Ca+O2-----∆-----> 2CaO(black residue)

e) when Magnesium burnt in oxygen.

2Mg+O2-----∆----> 2MgO.

f) when sodium burnt in oxygen.

4Na+O2----∆-----> 2Na2O.

hope all these reactions help you.

4 0

2 years ago

Hydrogen sulfide decomposes according to the following reaction: 2H2S(g) ⇋ 2H2(g) + S2(g) Kc=9.30x10-8 at 700.°C.If 0.45 mol of

Natalija [7]

Answer:

[H₂] = 1.61x10⁻³ M

Explanation:

2H₂S(g) ⇋ 2H₂(g) + S₂(g)

Kc = 9.30x10⁻⁸ = $\frac{[H_{2}]^2[S_{2}]}{[H_{2}S]^2}$

First we <u>calculate the initial concentration</u>:

0.45 molH₂S / 3.0L = 0.15 M

The concentrations at equilibrium would be:

[H₂S] = 0.15 - 2x

[H₂] = 2x

[S₂] = x

We <u>put the data in the Kc expression and solve for x</u>:

$\frac{(2x^2) * x}{(0.15-2x)^2}=9.30x10^{-8}$

$\frac{4x^3}{0.0225-4x^2}=9.30*10^{-8}$

We make a simplification because x<<< 0.0225:

$\frac{4x^3}{0.0225} =9.30*10^{-8}$

x = 8.058x10⁻⁴

[H₂] = 2*x = 1.61x10⁻³ M

5 0

3 years ago

Read 2 more answers

Catalina received her bank statement showing a savings account balance of $1,056.33. Not shown on the statement were a deposit o

Dafna1 [17]

$724.73 this would be the answer because if you subtract 320.50 and 86.10 from the 1056.33 then add 75 you get 724.73

6 0

3 years ago