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2 years ago

What are three signs that a chemical change has taken place

1 answer:

vladimir1956 [14]2 years ago

8 0

Three signs that a chemical change has taken place is 1) color change 2) formation of gas bubbles 3) a change in temperature ( if you have ever bleached your hair the reason why it is warm to the touch is because of a chemical reaction)

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Is a Frisbee flying through the air mechanical energy

victus00 [196]

Yes because mechanical energy is the motion of an object. hope that helped!

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2 years ago

Milk is solid by the liter in many countries. What is the volume of exactly 1/2 gal of milk in liters?

Marizza181 [45]

Answer : The volume of milk in liters are, 1.8925 liters

Explanation :

The conversion used for volume from gallon to liter is:

(1 gallon = 3.785 liter)

As we are given the volume of milk in gallon is, $\frac{1}{2}$

Now we have to determine the volume of milk in liters.

As, 1 gallon of milk = 3.785 liter

So, $\frac{1}{2}$ gallon of milk = $\frac{\frac{1}{2}\text{ gallon}}{1\text{ gallon}}\times 3.785\text{ liter}=1.8925\text{ liter}$

Therefore, the volume of milk in liters are, 1.8925 liters

6 0

2 years ago

(BRAINLIEST)<br> compounds that are used to reduce acidity of soil

Crank

Answer:

Pulverized Limestone

Explanation:

Hope it helps!!

8 0

1 year ago

Read 2 more answers

In an exothermic reaction, the enthalpy change is negative. Which of the following is also true for an exothermic reaction?

Drupady [299]

A. The products have a lower potential energy than the reactants.

5 0

2 years ago

A gas is collected at 30 Celsius and has a pressure of 200 kPa. What pressure would it exert if the temperature changed to 40 Ce

garik1379 [7]

Answer:

$206.6\ \text{kPa}$

Explanation:

$P_1$ = Initial pressure = 200 kPa

$P_2$ = Final pressure

$T_1$ = Initial temperature = $30^{\circ}\text{C}$

$T_2$ = Final temperature = $40^{\circ}\text{C}$

We have the relation

$\dfrac{P_2}{P_1}=\dfrac{T_2}{T_1}\\\Rightarrow P_2=\dfrac{T_2}{T_1}P_1\\\Rightarrow P_2=\dfrac{40+273.15}{30+273.15}\times 200\\\Rightarrow P_2=206.6\ \text{kPa}$

The pressure that would be exerted after the temperature change is $206.6\ \text{kPa}$ .

6 0

2 years ago