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3 years ago

10

What metirial is this

2 answers:

BaLLatris [955]3 years ago

7 0

The pic is very unclear sorry

aleksandrvk [35]3 years ago

3 0

I'm not sure based on the picture, but if this is chewing gum I think it would be the material of chicle. (Sorry if this didn't help)

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What does he want? change into passive

Marina CMI [18]

There’s no picture if you meant to add a picture

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3 years ago

liam uses a machine that counts waves on a metal cable. The machine counts 25 waves in 2 seconds. what is the frequency of the w

Softa [21]

Frequency is defined as the number of waves per second. In this machine 25 waves pass in one second.
We need to calculate the number of waves that pass a particular point during one second.
During 2 seconds -25 waves
Therefore in one second - 25/2 = 12.5 waves/s.
1 wave per second has the unit Hertz (Hz)
Therefore answer is 12.5 Hz

7 0

3 years ago

A fossil was analyzed and determined to have a carbon-14 level that is 70 % that of living organisms. The half-life of C-14 is 5

Citrus2011 [14]

Answer: 2948

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.69}{t_{\frac{1}{2}}}=\frac{0.693}{5730}=1.21\times 10^{-4}years^{-1}$

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}years^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{70}{100}\times 100=70$

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}$

$t=2948years$

Thus the fossil is 2948 years old.

5 0

3 years ago

What is the mass percent of barium in barium cyanide?

GaryK [48]

Answer:

72.521%

Explanation:

7 0

2 years ago

2) Using the following equation:

Ganezh [65]

the answer is 133

because thats how the water is

6 0

3 years ago