CHEMISTRY MIDDLE SCHOOL

80.8g of calcium contain hot many atoms?

Answers

Answer 1
Answer:

Answer:

3.325×6.022×1023=2×1024 3.325 × 6.022 × 10 23 = 2 × 10 24 atoms.
Answer 2
Answer: 24 atoms! Good luck :)

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A substance that forms a vapor is generally in what physical state at room temperature? solid, gas, liquid or solid, liquid

Which requires the removal of heat, melting or freezing?Is it evaporation? What is it? Why?

Answers

Freezing. If you take away energy from something, (lower its temperature), it will freeze. If you add heat to something, it will melt if it is a solid and evaporate if it is a liquid.

When you add energy to something, the atoms which comprise the substance jiggle and vibrate, meaning that on a large scale, a solid will become a liquid, and a liquid will become a gas.
Freezing, just think about it, the colder it gets the more likely there is going to be snow/ hail/ ice

How do t cells differ from b cells

Answers

They are different because of the person or animal that has those cells and also because of blood loss and infections

Which type of fire is sometimes set as a way to protect a forest?

Answers

Answer;

Surface fire

Explanation;

  • Surface fires are type of forest fires that may burn primarily as a surface fire, spreading along the ground as the surface litter and undergrowth on the forest floor and is engulfed by the spreading flames.
  • They are the easiest fires to put out and cause the least damage to the forest. Surface fires create the least amount of destruction.
  • These fires protects the forest by releasing the nutrients that would otherwise decompose slowly, having little benefit to the ecosystem.
  • Additionally, these fires allow more open spaces for new and different kinds of vegetation to grow and receive sunlight.

imagine a drop of water hanging from your finger. how is this similar to the water staying together after the balloon is popped

Answers

I believe it has to do with something in the water like atoms that holds it together, I'm not sure I forgot

Final answer:

The concept of surface tension, enforced by cohesive forces between water molecules, explains why a water droplet hangs from your finger and why water stays together momentarily after a balloon is popped.

Explanation:

The similarity between a drop of water hanging from your finger and the water staying together after a balloon is popped is surface tension. Surface tension is a physical property of liquids which makes them act like they are covered with a stretched elastic sheet. This property is caused by the cohesive forces between liquid molecules.

When a water droplet hangs from your finger, the cohesive forces of the water molecules hold them together in a droplet shape due to surface tension. Similarly, when a water-filled balloon is popped, the water doesn't immediately disperse into a fine spray but rather holds together momentarily. This is also due to cohesive forces and surface tension. Each water molecule is pulled equally in every direction by its neighboring water molecules, resulting in a net force of zero and maintaining its shape momentarily even without the balloon.

Learn more about Surface Tension here:

brainly.com/question/33741057

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What method would you use to obtain pure water from a mixture of water and ink

Answers

Answer: Distillation

Explanation:

Distillation is the process of purifying a liquid by successive evaporation and condensation. Water vaporises at a lower temperature compared to the ink pigment, therefore, the mixture is heated to boiling so that the water evaporates leaving the ink pigments in the flask. The evaporated water can the be passed into a condenser which converts the water vapour into liquid.

Answer: Distillation

Explanation: Separate ink from water using a process called distillation. This is a process of separating two substances mixed together. Water vaporizes at a lower temperature than the ink pigment so if you heat them, the water evaporates, leaving the ink pigment in the flask.

Can y'all give me some examples of physical changes

Answers

Something that melts, something that changes shapes (for instance, play dough being squished), something that boils, something being mixed or dissolved (but only if it doesn't chemically react), etc. A physical change is a change of state of matter. 
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