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Nat2105 [25]
2 years ago
5

Label each statement with its corresponding type of scientific knowledge. law theory fact hypothesis The melting point of ice is

0¬[infinity]C. arrowRight Repeated observations have consistently shown that oppositely charged objects attract each other. arrowRight When the elements carbon and nitrogen are mixed at 1500¬[infinity]C, they will react with each other. arrowRight Atoms are made of protons, neutrons, and electrons. Although we can't directly see these particles, this structure explains many experimental observations. arrowRight
Chemistry
1 answer:
EleoNora [17]2 years ago
3 0

Answer:

Follows are the solution to this question:

Explanation:

  • Fact: In this, the ice is melted at 0 ° C.  
  • law: It is used to repeated experiments consistently showed which objects marked to both the contrary attract each law.  
  • Hypothesis: If carbohydrates and nitrogen are combined at 1500 ° C, they interact with one another.    
  • Theory: Protons, nuclei, or ions are made of Atoms. As these molecules could not be seen explicitly, such legal structure several experimental observations.
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jan is holding an ice cube. what causes the ice to melt? thermal energy from the ice is transferred to the air. thermal energy f
loris [4]

Answer: Ice is melting due to the transfer of thermal energy from Jan's hand to ice.

Explanation: The melting of ice is a physical change and is happening when the thermal energy from Jan's hand is transferred to ice. Due to this energy transfer, the particles of ice starts to move faster and hence, making the ice melt.

In this, the physical state of ice is changing from solid to liquid state.

H_2O(s)\rightleftharpoons H_2O(l)

8 0
2 years ago
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The combustion of propane is best described as an
GalinKa [24]
<h3><u>Answer;</u></h3>

Exothermic chemical reaction

<h3><u>Explanation;</u></h3>
  • Exothermic reactions are chemical reactions where the products have less energy that the reactants.
  • Exothermic reactions give off energy, usually in the form of heat, while endothermic reactions absorb energy.
  • The combustion of propane is definitely an exothermic reaction because it generates a lot of heat.

5 0
2 years ago
When balanced, which equation would have the coefficient 3 in front of any of the reactants? Zn + HCl ZnCl2 + H2 H2SO4 + B(OH)3
Gwar [14]

The correct answer is B. H2SO4 + B(OH)3  B2(SO4)3 + H2O

Hope this helps!

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2 years ago
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Suppose you wanted to make a buffer of exactly ph 7.00 using kh2po4 and na2hpo4. if the final solution was 0.10 m in kh2po4, wha
OleMash [197]

Answer:- 0.138 M

Solution:- The buffer pH is calculated using Handerson equation:

pH=pKa+log(\frac{base}{acid})

KH_2PO_4 acts as a weak acid and Na_2HPO_4 as a base which is pretty conjugate base of the weak acid we have.

The acid hase two protons(hydrogen) where as the base has only one proton. So, we could write the equation as:

H_2PO_4^-\rightleftharpoons H^++HPO_4^-^2

Phosphoric acid gives protons in three steps. So, the above equation is the second step as the acid has only two protons and the base has one proton.

So, we will use the second pKa value. The acid concentration is given as 0.10 M and we are asked to calculate the concentration of the base to make a buffer of exactly pH 7.00.

Let's plug in the values in the equation:

7.00=6.86+log(\frac{base}{0.10})

7.00-6.86=log(\frac{base}{0.10})

0.14=log(\frac{base}{0.10})

Taking antilog:

10^0^.^1^4=\frac{base}{0.10}

1.38=\frac{base}{0.10}

On cross multiply:

[base] = 1.38(0.10)

[base] = 0.138

So, the concentration of the base that is Na_2HPO_4 required to make the buffer is 0.138M.

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2 years ago
What are the answers to these questions
Virty [35]

Answer:

Explanation:

So basically it just asking you question about that surtain subject .

5 0
2 years ago
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