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just olya [345]
2 years ago
5

There are several differences between chemical and physical changes. Which process is a sign of a chemical change? A. Rotting po

tato gives all of bad smell
B. Melting block of ice leaves a large puddle
C. A cloud quickly changes shape when blown by wind
D. A plaster statue breaks when it falls into the floor. PLEASE HELP
Chemistry
1 answer:
Nataly [62]2 years ago
8 0

Answer:

A. a rotten potato gives all of bad smell

Explanation:

B,C,D are all physical changes because we can reverse them back.we can cool the water back to make ice. if the wind passes again we can randomly get the same cloud shape in c. and in d we can make that statue again. but in A can we reverse the rotting process ? ( the enzyme reaction) no we cant because it is a chemical reaction it gives a bad smell because of the chemical changes occuring in it.

hope this helps

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A plate moves 200 m in 10,000 years. What is its rate in cm/year?
Varvara68 [4.7K]

Answer:

The answer is

<h2>2 cm/year</h2>

Explanation:

To find the rate in cm/year we must first convert 200 m into cm

1 m = 100 cm

if 1 m = 100 cm

Then 200 m = 200 × 100 = 20 ,000 cm

So the rate is

<h2>\frac{20000}{10000}</h2>

<u>Reduce the fraction with 10,000</u>

We have the final answer as

<h3>2 cm/year</h3>

Hope this helps you

3 0
2 years ago
Rays used to take pictures of bones in the human body are:
Alexeev081 [22]

Answer:

B

Explanation:

Because when you go to the doctors they say, "You need to get your x-rays done" not microwave

5 0
3 years ago
The rate law for the decomposition of phosphine (PH3) is below. It takes 120. s for 1.00 M PH3 to decrease to 0.250 M. How much
Lubov Fominskaja [6]

Answer: 588.8 seconds

Explanation:

1.00 - 0.25 = 0.75M

4.00 - 0.320 = 3.68M

Therefore,

0.75M in 120 seconds

3.68M in x seconds

Cross multiply:

0.75*x = 120*3.68

x = 120*3.68/0.75

x = 588.8 seconds

8 0
3 years ago
If a sample of hydrochloric acid is neutralized with sodium hydroxide, what products are formed?
GenaCL600 [577]
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6 0
3 years ago
A 32.0-g sample of HF is dissolved in water to give 2.0 × 102 mL of solution. The concentration of the solution is:
guajiro [1.7K]

 The concentration of the  solution is  8 M


 <u><em>calculation</em></u>

<em>  </em>Concentrati<em>on   =  moles/volume  in liters</em>

<em>  </em><em>step 1: find moles of HF</em>

<em>moles  of HF  =mass/molar mass</em>

<em>molar mass of  HF =  1+  19 )= 20 g/mol</em>

<em> moles is  therefore = 32.0  g/ 20 g/mol= 1.6  moles</em>

<em>Step 2:  convert  ml to L</em>

<em>volume in liters = 2.0 x 10^2 / 1000 =0.2 l</em>

<em>step 3: find the concentration</em>

<em>concentration  =  1.6 mol  / 0.2 l = </em><em>8 M</em>

4 0
2 years ago
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