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Anni [7]
4 years ago
14

I’m really confused can someone help? It’s almost due. Also for 2 at the end it says variable.

Chemistry
1 answer:
Zinaida [17]4 years ago
4 0
1 An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
The dependent variable is 'dependent' on the independent variable. As the experimenter changes the independent variable, the effect on the dependent variable is observed and recorded

2 A variable within a scientific experiment is something that is changed ( it varies). There should be only one manipulated variable within a scientific experiment so that the experimenter can be certain it is this variable which causes a pattern in the resultant data, if any exists at all. If there were multiple variables, then the experimenter would not know what accounted for the results of the experiment.
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What are the component of black powder and why are they needed to cause an explosion
melisa1 [442]

Hi There!

Black powder is an explosive powder consisting of saltpeter, sulfur, and charcoal, used chiefly in old guns fired for sport, in fireworks, and for spotting charges in practice bombs; black gunpowder.

In addition to being easily ignited by friction and impact, black powder is also extremely sensitive to flame and spark. It ignites violently when unconstrained and explodes when lit in even the slightest amount of confinement.

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6 0
2 years ago
The table above shows the ionic charges of several elements. Which element listed below is most similar to oxygen (O) in that it
dybincka [34]

Answer:

Long range

Explanation:

A. But not too sure

3 0
3 years ago
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What are the 3 things that should be remembered while writing a chemical reaction?​
stich3 [128]

Answer:

They are as follows:

  • Complete information about reactants and products, e.g. number of molecules, mass, etc.
  • Physical states of substances.
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  • Equation also shows if the reaction is exothermic or endothermic.

Explanation:

I hope it'll help you...

4 0
3 years ago
A saline solution contains 0.770 gg of NaClNaCl (molar mass = 58.55 g/molg/mol) in 133 mLmL of solution. Calculate the concentra
lukranit [14]

Answer:

0.104 M

Explanation:

<em>A saline solution contains 0.770 g of NaCl (molar mass = 58.55 g/mol) in 133 mL.</em>

<em />

The molar mass of the solute (NaCl) is 58.55 g/mol. The moles corresponding to 0.770 g are:

0.770 g × (1 mol/55.85 g) = 0.0138 mol

The volume of solution is 133 mL. In liters,

133 mL × (1 L/1000 mL) = 0.133 L

The molarity of NaCl is:

M = moles of solute / liters of solution

M = 0.0138 mol / 0.133 L

M = 0.104 M

4 0
3 years ago
Which pair of atoms is most likely to be covalently bonded?
cricket20 [7]
1)Na and O - ion bond
2)K and F - ion bond
3)Ne and O - no bond (as Ne is a noble gas)
And by elimination, your answer is 4)
8 0
4 years ago
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