Examples of solid mixtures in a classroom

Answers

Answer 1
Answer: chalk, the air, cement

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What technological development led to the discovery of the existence of subatomic particles?

Answers

Answer:

Thomson had discovered the first subatomic particle, the electron. Six years later Ernest Rutherford and Frederick Soddy, working at McGill University in Montreal, found that radioactivity occurs when atoms of one type transmute into those of another kind

Explanation:

What is the kinetic energy of the skier at a height of 60 meters above ground? (3 points)a.20,000 units, because total energy remains unchanged

b. 80,000 units, because total energy remains unchanged

c. 20,000 units, because total energy of the skier decreases

d. 80,000 units, because total energy of the skier decreases

Answers

Answer:

30,000 units, because total energy remains unchanged.

Step-by-step explanation:

The law of conservation of energy states that energy cannot be destroyed, it remains conserved but transforms from one form to the other form.

Hence, we can say that

Total energy = kinetic energy (KE) + potential energy (PE).

At 100 meters above

Total energy = 0 + 50000 = 50000 units.

Hence, 60 meters, total energy would be

20,000  + x = 50000 units

Finally,

x = 50,000 - 20,000

= 30,000

The energy will only transform from one form to the other but will not change.

30,000 units is the right answer

What is the relationship between accuracy and precision? Please use at least 2 complete content related sentences.

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Answer:

im wondering how you 45 and in middle school

Explanation:

but im also trying to find out this answer sooo

Why does table salt dissolve more rapidly than rock salt

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because in rock salt, the molecules are packed together and they take longer time to separate and dissolve. As for table salt the molecules are less packed together and take less time to dissolve. Think it like this. The more packed or tightly the substance/object is, the longer it will take for the object to dissolve. The less packed the object/substance is the faster it takes to dissolve. Hope this helped :)

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What is happening within the system when it is at equilibrium in terms of concentration, reactions that occur, and reaction rates? 2CH4(g) <--> C2H2(g) + 3H2(g)

Answers

Answer and Explanation:

It is worthy to be mentioned that the equilibrium in this reaction is dynamic equilibrium.

  1. In terms of concentration: the concentration of reactants (CH4) and products (C2H2 & H2) do not change and be constant at the equilibrium, that 2 moles of CH4 give one mole of C2H2 and 3 moles of H2.
  2. In terms of reactions that occur: the reactions that occur at the equilibrium are the forward and the reverse reaction. The forward reaction: 2CH4 → C2H2 + 3H2 and the reverse reaction: C2H2 + 3H2 → 2CH4.
  3. In terms of reaction rates: At equilibrium the rate of the forward reaction is equal to the rate of the reverse reaction.

Answer:

In a chemical reaction equilibrium is in the state which reacts with both products and reactants.  Both reverse and forward are happening and both reaction rates forward and reverse are equal.  

Explanation:

This is what i put and i got it right.

Is the following sentence true or false. very few minerals are compound

Answers


false very few minerals are a compound