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mina [271]
3 years ago
12

Evidence of a chemical reaction includes all of the following EXCEPT: A. baking soda and vinegar release gas bubbles B. while ch

ewing a cookie, it becomes smaller pieces so you can swallow it C. heat is generated after mixing 2 chemicals
Chemistry
1 answer:
Bumek [7]3 years ago
3 0

Answer:

B.

Explanation:

Chemical reaction have to have either a temp change, formation of precipitate, formation of gas, or color change.

- Hope that helps! Please let me know if you need a further explanation.

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* Who can help with this lol *
Viktor [21]

Answer: subduction and sea floor spreading

Explanation:

He knew that the continents today were once joined together by fossil records of plants and animals that were found to be on continents far removed from each other. He knew this also by corresponding land forms that matches up as well. What he couldn’t prove is how the land masses would have moved so far away from each other. Subduction and sea floor spreading move the tectonic plates that the continents sit on. That’s what he was missing.

5 0
3 years ago
How does molarity and molality affect the concentration of a solution<br>explain.
kolbaska11 [484]

Concentration of a solution can be expressed in terms of molarity and molality

Molarity is the number of moles of solute in a liter of a solution.

Molarity (M) = Moles of solute/Volume(litres) of solution

Molality is the number of moles of solute in one kg of the solution

Molality (m) = Moles of solute/Mass (kg) of solution

Therefore if the volume or the mass of the solution is changed this would affect the concentration.

In addition, volume is a quantity which depends on temperature. However, mass is independent of temperature. Therefore any changes in temperature, can also bring about a change in the molarity of the solution.


5 0
3 years ago
The volume of a sphere is given by the equation =4/33, where is the radius. Calculate the volume of a sphere with a radius of 34
sineoko [7]

Answer:

its 45 because of 49 og the

5 0
3 years ago
Calculate the poh of this solution. round to the nearest hundredth. ph = 1.90 poh =
Viktor [21]

Answer:

The answer is 5.10

Explanation:

<h3><u>Given</u>;</h3>
  • pH = 1.9
<h3><u>To </u><u>Find</u>;</h3>
  • pOH = ?

We know that

pH + pOH = 7

pOH = 7 – pH

pOH = 7 – 1.90

pOH = 5.10

Thus, The pOH of the solution is 5.10

6 0
2 years ago
In a sample of oxygen gas at room temperature, the
valina [46]

Answer: The Kinetic Molecular Theory of  Matter

Explanation: The answer is: B. Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.

The Kinetic Molecular Theory of  Matter

7 0
2 years ago
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