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2 years ago

10

Which element is classified as a metal?

2 answers:

PilotLPTM [1.2K]2 years ago

5 0

Answer:

A, B, C Are The answers.

Explanation:

asambeis [7]2 years ago

3 0

Which element is classified as a metal?

<em>D</em><em>.</em><em> </em><em>Cadmium</em><em> </em><em>(</em><em>Cd</em><em>)</em>

<em>Cadmium</em><em> </em><em>is</em><em> </em><em>a</em><em> </em><em>soft-silvery</em><em> </em><em>white</em><em> </em><em>metal</em><em>.</em>
<em>It's</em><em> </em><em>atomic</em><em> </em><em>number</em><em> </em><em>is</em><em> </em><em>48</em><em> </em><em>and</em><em> </em><em>Symbol</em><em> </em><em>is</em><em> </em><em>Cd</em>
<em>It</em><em> </em><em>is</em><em> </em><em>present</em><em> </em><em>in</em><em> </em><em>the</em><em> </em><em>period</em><em> </em><em>5</em><em> </em><em>of</em><em> </em><em>periodic</em><em> </em><em>table</em>
<em>It's</em><em> </em><em>atomic</em><em> </em><em>mass</em><em> </em><em>is</em><em> </em><em>112.411</em><em> </em><em>u</em>
<em><u>A</u></em><em><u> </u></em><em><u>pic</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>cadmium</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>also</u></em><em><u> </u></em><em><u>attached</u></em><em><u>!</u></em><em><u>!</u></em><em><u>~</u></em>

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Which explains how burning a magnesium ribbon highlights a toolmark?

Setler [38]

<h2>Answer:</h2>

The magnesium ribbon, <u>D. It forms a material to cast the tool mark</u>.

<h2>Explanation:</h2>

When a magnesium ribbon is burnt in the presence of oxygen it gives out strong light and heat is produced. Apart from it, it leads to the production of substance called as magnesium oxide which is formed as the product due to the reaction of magnesium with the oxygen present in the air.

Tool marks are the mark which is created by tools while using them. In order to identify or locate them castes made up of magnesium oxide is utilized. When this is pasted on the suspected area, the tool mark of the suspected tool gets pasted on it.

6 0

4 years ago

What is the energy released in this β − β − nuclear reaction 40 19 K → 40 20 C a + 0 − 1 e 19 40 K → 20 40 C a + − 1 0 e ? (The

Effectus [21]

<u>Answer:</u> The energy released in the given nuclear reaction is 1.3106 MeV.

<u>Explanation:</u>

For the given nuclear reaction:

$_{19}^{40}\textrm{K}\rightarrow _{20}^{40}\textrm{Ca}+_{-1}^{0}\textrm{e}$

We are given:

Mass of $_{19}^{40}\textrm{K}$ = 39.963998 u

Mass of $_{20}^{40}\textrm{Ca}$ = 39.962591 u

To calculate the mass defect, we use the equation:

$\Delta m=\text{Mass of reactants}-\text{Mass of products}$

Putting values in above equation, we get:

$\Delta m=(39.963998-39.962591)=0.001407u$

To calculate the energy released, we use the equation:

$E=\Delta mc^2\\E=(0.001407u)\times c^2$

$E=(0.001407u)\times (931.5MeV)$ (Conversion factor: $1u=931.5MeV/c^2$ )

$E=1.3106MeV$

Hence, the energy released in the given nuclear reaction is 1.3106 MeV.

6 0

3 years ago

Please help me with dis

topjm [15]

Answer:

c

Explanation:

4 0

3 years ago

Guillaume Amontons first took a stab at measuring absolute zero in 1702. What would be the most reasonable way it would have bee

Tema [17]

The most reasonable way to measure absolute zero would have been to extrapolate the ideal gas law.

<h3>What is Absolute zero?</h3>

This is referred to the temperature at which a thermodynamic system has the lowest form of energy.

Guillaume Amontons used gas equation to prove that absence of heat was theoretically possible which would have involved only extrapolating the ideal gas law.

Read more about Absolute zero here brainly.com/question/18560146

#SPJ1

3 0

2 years ago

The pH of a solution is 3.81. What is the OH concentration in the solution?

disa [49]

Answer:

6.46 × 10⁻¹¹ M

Explanation:

Step 1: Given data

pH of the solution: 3.81

Step 2: Calculate the pOH of the solution

We will use the following expression.

pH + pOH = 14.00

pOH = 14.00 - pH = 14.00 - 3.81 = 10.19

Step 3: Calculate the concentration of OH⁻ ions

We will use the definition of pOH.

pOH = -log [OH⁻]

[OH⁻] = antilog -pOH = antilog -10.19 = 6.46 × 10⁻¹¹ M

3 0

3 years ago