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3 years ago

In a controlled scientific experiment,a scientist

Chemistry

2 answers:

zmey [24]3 years ago

8 0

Answer: D

Explanation:

In a controlled scientific experiment, there should be an independent variable, a dependent variable, and a control. The independent variable is the factor in the experiment that is manipulated by the scientist. The dependent variable is the factor in the experiment that changes in response to the independent variable. Controls in an experiment are used as comparison factors, and they can help determine the magnitude of the experiment's results.

Scientists carefully control their variables so they can understand how the variables affect the system as a whole. This makes the data collected from an experiment meaningful.

s344n2d4d5 [400]3 years ago

5 0

The answer is D, alters the test variable, and observes the effects on other outcome variables.

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The decomposition reaction of carbon disulfide to carbon monosulfide and sulfur is first order with k = 2.80 ✕ ✕ 10−7 sec-1 at 1

madam [21]

Answer: a) 1.97 grams of carbon disulfide will remain after 37.0 days.

b) 2.85 grams of carbon monosulfide will be formed after 37.0 days.

Explanation: The decomposition of carbon disulfide is given as:

$CS_2(g)\rightarrow CS(g)+S(g)$

at t=0 4.83g 0 0

at t=37 days 4.83 - x x x

here,

x = amount of $CS_2$ utilised in the reaction

This reaction follows first order kinetics so the rate law equation is:

$k=\frac{2.303}{t}log\frac{A_o}{A}$

where, k = rate constant

t = time

$A_o$ = Initial mass of reactant

A = Final mass of reactant

a) For this, the value of

$k=2.80\times10^{-7}sec^{-1}$

t = 370 days = 3196800 sec

$A_o$ = 4.83

A = 4.83-x

Putting values in the above equation, we get

$2.8\times 10^{-7}sec^{-1}=\frac{2.303}{3196800sec}log\left(\frac{4.83}{4.83-x}\right)$

x = 2.85g

Amount of $CS_2$ remained after 37 days = 4.83 - x

= 1.97g

b) Amount of carbon monosulfide formed will be equal to "x" only which we have calculated in the previous part.

Amount of carbon monosulfide formed = 2.85g

6 0

3 years ago

If you have a polyatomic anion of Ammonium (NH41+), how many valence electrons must your Lewis Structure have?

tigry1 [53]

Answer:

One can draw the 3-dimensional structure of an atom once they have the Lewis Structure of an atom. The 3-dimensional geometrical structure of ammonium, NH4+ is referred to as Tetrahedral. ... But the + sign decrees that NH4+ has 8 valence shell electrons, due to the positive ion.

Explanation:

6 0

3 years ago

I need help with these 4

storchak [24]

Rift Valley Examples

East African
Rhine Rift Valley (Germany)
Baikal Rift Valley (Russia)

Rift Valley Facts/Characteristics

Bordered by fault zones and separating land masses
A portion of land that drops, forming a valley.
Formed as tectonic plates move.

Fossils - Examples

Bones
Shells
Exoskeletons
Stone imprints of animals.

Non Examples of Fossils

Stones
rocks
Some bones (If they are fossils they will be a lot heavier than other bones.

Hope this helps.

5 0

3 years ago

Two parts that make up a solution are... what

hjlf

Answer: All solutions have two parts: the solute and the solvent. The solute is the substance that dissolves, and the solvent is the substance that dissolves the solute.
Hope that helps (:

5 0

3 years ago

Please help! 50 points and Brainliest!

olga2289 [7]

Answer:

exothermic reaction

Explanation:

I think this because this is an example of an exothermic reaction is the chemical reaction between sodium and chlorine, which results in the formation of sodium chloride (also known as common salt)

8 0

2 years ago

Read 2 more answers