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3 years ago

Bacteria come in different shapes true or false

Chemistry

2 answers:

Serhud [2]3 years ago

8 0

Answer:

true

Explanation:

siniylev [52]3 years ago

6 0

Answer:

true

Explanation:

some of the commonly observed shapes are

cocci : round

bacilli : rod-shaped

cocco-bacilli : rod- and round-shaped at the same time

Spirillum: spiral

These shapes also have different arrangements that you can check up for more understanding.

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The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min for

Zigmanuir [339]

Answer:

Therefore it takes 8.0 mins for it to decrease to 0.085 M

Explanation:

First order reaction: The rate of reaction is proportional to the concentration of reactant of power one is called first order reaction.

A→ product

Let the concentration of A = [A]

$\textrm{rate of reaction}=-\frac{d[A]}{dt} =k[A]$

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

[A₀] = initial concentration

[A]= final concentration

t= time

k= rate constant

Half life: Half life is time to reduce the concentration of reactant of its half.

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

Here $t_{\frac{1}{2} }=0.13 min$

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

$\Rightarrow k=\frac{0.693}{13 }$

To find the time takes for it to decrease to 0.085 we use the below equation

$k=\frac{2.303}{t} log\frac{[A_0]}{[A]}$

$\Rightarrow t=\frac{2.303}{k} log\frac{[A_0]}{[A]}$

Here , $k=\frac{0.693}{13 }$ , [A₀] = 0.13 m and [ A] = 0.085 M

$t=\frac{2.303}{\frac{0.693}{13} } log(\frac{0.13}{0.085})$

$\Rightarrow t= 7.97\approx 8.0$

Therefore it takes 8.0 mins for it to decrease to 0.085 M

7 0

3 years ago

What volume would be needed to prepare 375 mL of a .45 M CaCl2 using only a solution of 1.0 M CaCl2 and water?

Neporo4naja [7]

Answer:

168.75 ml

Explanation:

M1V1=M2V2

375ml*.45M=1M*V2

8 0

3 years ago

Is cutting paper with scissors a non physical change

AleksAgata [21]

No, cutting paper is a physical change, as you are changing how the paper appears.

hope this helps

6 0

4 years ago

Read 2 more answers

Which of the following is true about technology and science

galben [10]

Answer:

car

Explanation:

4 0

4 years ago

A sample was collected and analyzed. If there are only three gasses present, the total pressure of the sample is 194.66 kPa, the

dmitriy555 [2]

I dont get the question

6 0

3 years ago