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2 years ago

Which type of test helps forensic scientists to narrow down the possibilities of what drug a substance may be?

Chemistry

2 answers:

kobusy [5.1K]2 years ago

8 0

The right answer is screening test.

In medicine, screening consists of looking for one or more diseases or abnormalities known as "at risk" in individuals of a given population.

These investigations are followed or not by medical consultations, clinical examinations and treatments.

In addition, screening is a preliminary procedure (test or examination) to detect one or more characteristic signs or symptoms of a disease or syndrome and potentially leading to further investigation.

blagie [28]2 years ago

8 0

Answer:

Screening Test

Explanation:

gradpoint

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Question 2 of 50

wolverine [178]

The thermal decomposition of calcium carbonate will produce 14 g of calcium oxide. The stoichiometric ratio of calcium carbonate to calcium oxide is 1:1, therefore the number of moles of calcium carbonate decomposed is equal to the number of moles of calcium oxide formed.

Further Explanation:

To solve this problem, follow the steps below:

Write the balanced chemical equation for the given reaction.
Convert the mass of calcium carbonate into moles.
Determine the number of moles of calcium oxide formed by using the stoichiometric ratio for calcium oxide and calcium carbonate based on the coefficient of the chemical equation.
Convert the number of moles of calcium oxide into mass.

Solving the given problem using the steps above:

STEP 1: The balanced chemical equation for the given reaction is:

$CaCO_{3} \rightarrow \ CaO \ + \ CO_{2}$

STEP 2: Convert the mass of calcium carbonate into moles using the molar mass of calcium carbonate.

$mol \ CaCO_{3} \ = 25 \ g \ CaCO_{3} \ (\frac{1 \ mol \ CaCO_{3}}{100.0869 \ g \ CaCO_{3}})\\ \\\boxed {mol \ CaCO_{3} \ = 0.2498 \ mol}$

STEP 3: Use the stoichiometric ratio to determine the number of moles of CaO formed.

For every mole of calcium carbonate decomposed, one more of a calcium oxide is formed. Therefore,

$mol \ CaO \ = 0.2498 \ mol$

STEP 4: Convert the moles of CaO into mass of CaO using its molar mass.

$mass \ CaO \ = 0.2498 \ mol \ CaO \ (\frac{56.0774 \ g \ CaO}{1 \ mol \ CaO})\\ \\mass \ CaO \ = 14.008 \ g$

Since there are only 2 significant figures in the given, the final answer must have the same number of significant figures.

Therefore,

$\boxed {mass \ CaO \ = 14 \ g}$

Learn More

Learn more about stoichiometry brainly.com/question/12979299
Learn more about mole conversion brainly.com/question/12972204
Learn more about limiting reactants brainly.com/question/12979491

Keywords: thermal decomposition, stoichiometry

5 0

2 years ago

2. What major alkene product is produced by the dehydration of the following alcohols?

weeeeeb [17]

2-Dimethylcyclohexanol <span>major alkene product is produced by the dehydration of the alcohols.</span>

4 0

2 years ago

For which purpose do biochemist insert human genes into bacteria

Mumz [18]

Answer: to find a cure for the common cold to produce insulin for diabetics

Explanation: It has helped many people

5 0

2 years ago

Use reactivity series to predict the products of the following reactions. complete and balance the equation

Gre4nikov [31]

Answer:

products and reaction

Explanation:

Products

1. FeSO4 and Cu

2. ZnSO4 and Fe

3. CaCl2 and H2

Reactions

1. Fe + CuSO4 → FeSO4 + Cu

2. FeSO4 + Zn → ZnSO4 + Fe

3. 2HCl + Ca → CaCl2 + H2

4 0

2 years ago

Why does a yellow pencil look yellow?

Tpy6a [65]

Answer:

Regular, non-fluorescent colors appear to our eyes when objects absorb some wavelengths of light, and reflect others. For example, a yellow pencil looks yellow because its paint reflects the wavelength of yellow light, and absorbs the other wavelengths.Mar

3 0

2 years ago