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4 years ago

In a controlled experiment the factor tested is called the

Chemistry

1 answer:

Lostsunrise [7]4 years ago

5 0

In a controlled experiment the factor tested is called the experimental group

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ella [17]

Answer:

The object is moving at a constant speed.

7 0

3 years ago

What metals having only 2 valence electrons

evablogger [386]

Alkaline earth metals

3 0

4 years ago

The average blood volume in the human body is about 4.9 L. Convert this volume to cubic centimeters (cm3).a. milliliters (mL)b.

CaHeK987 [17]

Answer:

a. 4900 mL; b. 4900 cm³ c. 4.9x10⁻³ m³

Explanation:

1 L = 1 dm³

4.9 L = 4.9 dm³

1 dm³ = 1000 cm³ → 4900 cm³

1 cm³ = 1 mL (4900 mL)

1 dm³ = 1x10⁻³ m³ → 4.9x10⁻³ m³

6 0

3 years ago

What are the measurements for standard temperature and pressure (stp)? kp?

Alex787 [66]

Standard Temperature and Pressure (STP) are 273.15 K (Kelvin) and 101.3 KPa (kilopascals).

You can substitute 1 ATM (atmosphere) for the kilopascal measurement. It is discouraged to use 0°C for the temp equivalent since negative temperature numbers can't be used in gas equations..

8 0

4 years ago

What is the % yield of the reaction making 1.6 g of acetyl salicylic acid from 5.7 g of salicylic acid, 9.9 mL of acetic anhydri

artcher [175]

Answer:

Yield of reaction is 76.7%

Explanation:

The reaction of salicylic acid with acetic anhydride to produce acetyl salicylic acid is 1:1. That means 1 mole of salicylic acid reacts with 1 mole of acetic anhydride (Acid is catalyst of reaction).

Moles of salicylic acid are:

$5.7g\frac{1mol}{138.121g} = 0.04127 moles$

And moles of acetic anhydride are:

$9.9mL\frac{1.082g}{mL} \frac{1mol}{102.09g} = 0.105 moles$

As salicylic acid is limiting reactant, theoretical moles of acetyl salicylic acid are 0.04127mol. That means theoretical mass of acetyl salicylic acid is:

$0.04127moles\frac{180.158g}{1mol} = 7.435g$

Thus, yield of reaction is:

$\frac{5.7g}{7.435} *100=$ <em>76.7%</em>

5 0

3 years ago