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pickupchik [31]
3 years ago
9

In a controlled scientific experiment, a scientist A. alters one test variable (independent variable) and observes the effects o

n other test variables (independent variables). B. alters one outcome variable (dependent variable) and observes the effects on other outcome variable (dependent variables). C. alters the test variable (independent variable) and observes the effects on the outcome variable (dependent variable).
Chemistry
1 answer:
Lubov Fominskaja [6]3 years ago
6 0

Answer:

C )

Explanation:

Controlled scientific experiment tests scientific assumption (hypothesis), under controlled conditions.

In controlled scientific experiment, alters the test variable (independent variable) and observes the effects on the outcome variable (dependent variable).

Eg : Studying impact of sunlight on plant's group, where former independent variable is altered & its effects on dependent outcome variable is observed.

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A sample containing 43.98g of metal pellets is poured into a graduated cylinder initially containing 13.8 mL of water, causing t
kumpel [21]

Answer:

5.9 g/cm³

Step-by-step explanation:

Data:

        Mass of metal = 43.98 g

Initial level of water = 13.8 mL

Final level of water = 21.3 mL

Calculations:

The picture below illustrates what's happening in this experiment.

The water level was originally at 13.8 mL.

Then you added the metal. It fell to the bottom and displaced its volume of water.

The water level rose to 21.3 mL, so

Volume of metal = volume of displaced water

                               = 21.3 mL – 13.8 mL

                               = 7.5 mL

                               = 7.5 cm³

               Density = mass/volume

                               = 43.98/7.5

                               = 5.9 g/cm³

3 0
4 years ago
The electronegativity is 2.1 for H and 3.0 for N. Based on these electronegativities, NH4 would be expected to The electronegati
amid [387]

Answer:

First statement is true:

  • <u><em>NH₄ would be expected to have polar covalent bonds with a partial positive charges on the H atoms.</em></u>

Explanation:

Nitrogen (N) and hydrogen (H) are two nonmetals; thus, it should be a hint to assert that they form a covalent bond.

The difference in <em>electronegativities</em> between<em> N</em> and <em>H </em>is <em>3.0</em> - <em>2.1</em> = 0.9.

That makes that the bonds be <em>polar</em>. Ions are not formed because to transfer the electrons from one atom to the other (to form ionic bonds) requires an electronegativity difference greater than about 1.7.

Since N is more electronegative than H, in the molecule <em>NH₄</em>, each N atom will pull the electron density toward itself acquiring a partial negative charge and leaving H atoms with a partial positive charge.

Thus, each NH bond is<em> polar covalent with a partial positive charge on the H atoms</em> (first statement from the choices).

3 0
3 years ago
Read 2 more answers
Can a "hot" ice cream mixture lose enough heat energy to ice to make ice cream freeze?
ahrayia [7]
YES I think it can that is a really good question I'm gonna rate you 5 stars for that question that was the best question ive ever had lol
6 0
4 years ago
Which feature does the model show accurately
Illusion [34]

We need a image to answer this sorry

3 0
3 years ago
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in food
Ksju [112]

Answer:

1.1 percent

Explanation:

C6H5COOH⇌C6H5COO+H

Ka = [C6H5COO-][H+]/[C6H5COOH]

From pKa of 4.2, Ka = 6.3x10^-5

6.3x10^-5 = (x)(x)/0.51-x and assuming x is small...

6.3x10^-5 = x^2/0.51

x^2 = 3.213x10^-5

x =5.67 x10^-3

(5.67x10^-3/0.51)x 100 =1.1 percent

3 0
3 years ago
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