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Alexeev081 [22]
3 years ago
8

Help please !!!

Chemistry
1 answer:
shepuryov [24]3 years ago
5 0

Answer: 3. Kinetic energy of the hands heats up the air.

Explanation: My explanation might be a little dumb. When you're cold you will put your hands together and rub really fast to create heat. When you clap your hands the same thing is happening. I hope this helps!

Let me know if I'm wrong, have a good day!

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3. A girl<br> ran 105 metres in 15 seconds. What was her speed
sweet [91]

Answer:

7 meters per second was her speed

5 0
2 years ago
6 How many moles are in a 321 g sample of magnesium?
Tatiana [17]

Answer:

13.4mol of Mg

Explanation:

Given parameters:

Mass of magnesium = 321g

Unknown:

Number of moles  = ?

Solution:

The number of moles of a substance is given as;

  Number of moles  = \frac{mass}{molar mass}  

 Molar mass of Mg = 24g/mol

 Insert the parameters and solve;

        Number of moles  = \frac{321}{24}   = 13.4mol of Mg

3 0
3 years ago
Which of the following is a chemical property?
TEA [102]
The answer to this question is A
6 0
3 years ago
Read 2 more answers
Adding O2 to the reaction 6CO2 + 6H2O C6H12O6 + 6O2. WHICH WAY WILL THE REACTION SHIFT?
Oxana [17]

Answer:

The reaction will shift to the left to produce more reactants.

Explanation:

According to the Le- Chatelier principle,

At equilibrium state when stress is applied to the system, the system will behave in such a way to nullify the stress.

The equilibrium can be disturb,

By changing the concentration

By changing the volume

By changing the pressure

By changing the temperature

Consider the following chemical reaction.

Chemical reaction:

6CO₂ +  6H₂O  ⇄  C₆H₁₂O₆ + 6O₂

In this reaction the equilibrium is disturb by increasing the concentration of Product.

When the concentration of product is increased the system will proceed in backward direction in order to regain the equilibrium. Because when product concentration is high it means reaction is not on equilibrium state. As the concentration of O₂  increased the reaction proceed in backward direction to regain the equilibrium state and more reactant is formed.

4 0
3 years ago
Which is the correct Lewis dot structure for BeH2 ?
kherson [118]
H• •Be• •H --> H:Be:H
Since there are 4 valence electrons in total, Beryllium has 2 and Hydrogen has 2. You would put the Be in the middle because there is only 1 of them.
7 0
3 years ago
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