Round 89 to 90 then divide by 4. so its 24.
<span>Earth's gravitational potential energy: GPE = mgh = Gravity (9.81m/s2) × Mass (kg) × Height (m)
it's k</span><span>inetic energy</span>
<h3>
Answer:</h3>
All the choices given are correct
- gas bubbles
- color change
- increase in temperature
- decrease in temperature
- release of light energy
<h3>
Explanation:</h3>
- Chemical reactions occurs when elements or compounds chemically join to form other compounds.
But, how do we know that indeed a chemical reaction has occurred?
- Chemical reactions involve changes of different parameters when they occur, thus various indications are used to show the occurrence of chemical reactions.
These indications include;
- Gas bubbles, also known as effervescence, for example when sodium metal is mixed with an acid, gas bubbles will be produced showing occurrence of a chemical reaction.
- Color change, which shows the formation of a new substance.
- Increase in temperature, which occurs in endothermic reactions where heat is absorbed from the surroundings.
- Decrease in temperature, which occurs in exothermic reaction where heat is lost to the surroundings.
- Other indicators include, formation of a precipitate, production of light, etc.
The formula for calculating the density (p)=m/v
m:mass
v:volume
<u>Explanation:</u>
In the question above,given that
<u>mass of water (m)</u> =100 g
<u>Volume of water in a beaker (v)</u>=100 mL
<u>The Density of the water(p</u>)=m/v=100 g/100 mL= 1 g/mL
The answer is (B) 1 g/mL