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Marta_Voda [28]
3 years ago
12

Alice and Marge are studying the properties of matter. The girls cut some silver-colored magnesium sheets into 3-inch long strip

s and then put one strip each into test tubes: one containing water and one containing acid. Nothing happened when they added the magnesium to the water. In the acid, bubbles formed and the test tube felt much warmer. Based on the girls' experiment, what is a chemical property of magnesium? A) Magnesium is a metal. B) Magnesium reacts in acids. C) Magnesium is solid at room temperature. D) Magnesium is malleable and can be shaped into strips.
Chemistry
2 answers:
pochemuha3 years ago
6 0

Answer:

Explanation:

The correct answer is B

frosja888 [35]3 years ago
4 0
<span>B) Magnesium reacts in acids</span>
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The true absorbance for a 1.0 x 10 −5 M solution is 0.7526. If the percentage stray light for a spectrophotometer is 0.56%, calc
Korvikt [17]

Answer:

The percentage deviation is  \Delta M = 1.87%

Explanation:

From the question we are told that  

     The concentration is of the solution is C = 1.0*10^{-5} M

     The true absorbance A = 0.7526

      The percentage of transmittance due to stray light z = 0.56% =\frac{0.56}{100}  = 0.0056

Generally Absorbance is mathematically represented as

           A = -log T

Where T is  the percentage of true transmittance

    Substituting value  

          0.7526 = - log T

              T = 10^{-0.7526}

                  = 0.177

                  = 17.7%

The Apparent absorbance is mathematically represented

           A_p = -log (T +z)

Substituting values

           A_p = -log(0.177 + 0.0056)

                = -log(0.1826)

               = 0.7385

The percentage by which apparent absorbance deviates from known absorbance is mathematically evaluated as

       \Delta A = \frac{A -A_p}{A} * \frac{100}{1}

              = \frac{0.7526 - 0.7385}{0.7526} * \frac{100}{1}

             \Delta A = 1.87%  

Since Absorbance varies directly with concentration the percentage deviation of the apparent concentration from know concentration  is

              \Delta M = 1.87%

           

6 0
3 years ago
Scientists have been able to find a full record of Earth's fossil history, thus making the fossil record complete.
Arada [10]

Answer:

False

Explanation:

Few organisms were not preserved as well as others, and new fossils are found every day

5 0
3 years ago
Which Kelvin temperatures represent, respectively, the normal freezing point and the normal boiling point of water?
zhenek [66]

Answer:

4. 273 K and 373K.

Explanation:

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8 0
3 years ago
A 5-kg quantity of radioactive isotope decays to 2 kg after 10 years. Find the decay constant of the isotope.k = _____
Dvinal [7]

Answer:

k = -0.09165 years^(-1)

Explanation:

The exponential decay model of a radioactive isotope is generally given as;

A(t) = A_o(e^(kt))

Where;

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We are given;

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A(10) = 2kg

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Thus;

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Thus;

2 = 5(e^(10k))

2/5 = (e^(10k))

0.4 = (e^(10k))

In 0.4 = 10k

-0.9164 = 10k

k = -0.9164/10

k = -0.09165 years^(-1)

7 0
3 years ago
What other green plant which make they own food
kobusy [5.1K]

Answer and

Explanation:

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3 0
3 years ago
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