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Jet001 [13]
3 years ago
11

suggest two observations that you can make when Calcium reacts with water and write a balanced equation for the reaction of calc

ium with water
Chemistry
1 answer:
Kamila [148]3 years ago
8 0

• Bubbles of a colourless, odourless gas are evolved

• The solution turns red litmus blue

       Ca + 2H_2O→ Ca(OH)_2 + H_2

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Sound travels most quickly through solids because _____. solids have greater frequencies the molecules in solids are very close
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Sound travels most quickly through solids because _____.

answer is: because solids r the most sense.

The distance between molecules in solids r very small.Because they are so close, they can collide very quickly, i.e. it takes less time for a molecule of the solid to 'bump' into its neighbor. Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids.

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3 years ago
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Please help!!!!!!!!!!!!!!!!!!!
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Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs.

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3 years ago
How is a mole related to concentration?
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If three neutrons are produced when a neutron bombards a U- 235 atom, determine the second fission product isotope when the firs
alexira [117]

Explanation:

235 U92 + 1n0 --> A + B + 3 1n0

when A = ;

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Atomic number = 92 - 54 = 38

Element = Sr - Strontium

(b) barium-144

Mass number of B = 235 + 1 - 144 -3 = 89

Atomic number = 92 - 56 = 36

Element = Kr - Krypton

(c) cesium-143

Mass number of B = 235 + 1 - 143 -3 = 90

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Element = Rb - Rubidium

(d) tellurium-137

Mass number of B = 235 + 1 - 137 -3 = 96

Atomic number = 92 - 52 = 40

Element = Zr - Zirconium

(e) lanthanum-146

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4 years ago
The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abb
Nimfa-mama [501]

Answer:

\boxed{\text{254 g}}

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\begin{array}{rcl}\text{\% m/V} & = & \dfrac{\text{Mass of sucrose}}{\text{Volume of solution}}\\\\\text{Let m}& = &\text{mass of sucrose}\\\dfrac{\text{35.0 g}}{\text{100 mL}}& = & \dfrac{m}{\text{725 mL}}\\\\m & = &\dfrac{\text{35.0 g}\times 725}{100}\\\\ & = &\textbf{254 g}\\\end{array}\\\text{You need $\boxed{\textbf{254 g}}$ of sucrose}

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3 years ago
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