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WARRIOR [948]
3 years ago
14

(50 POINTS)THIS IS A TIMED TEST PLEASE ANSWER

Chemistry
1 answer:
aliina [53]3 years ago
5 0

Answer:

the second one down is your answer

Explanation:

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Properties of calcium​
MariettaO [177]

Hey there!

Your PHYSICAL properties of calcium is/are....

- COLOR which gives you a silvery whitish metallic color

- PHASE which is pretty much solid

- HARDNESS which is quite soft metal

- CRYSTALLINE STRUCTURES which is like a cubic symbol

- DUCTILITY which can be misused into millions of thin specs

- MALLEABILITY which forms the shape or vent

- MELTING POINT which is estimated to about 850 degree Celsius

- BOILING POINT which is estimated to 1,480 degree Celsius

The CHEMICAL properties of calcium is/are...

• CHEMICAL CODE

• OXIDATION which is used for the steel

• ISOTOPES calcium has about 6 of them

• COMPOUNDS includes marble and limestone (there’s more)

• FLAMMABILITY when it is burned into the air or in the oxygen it will most likely catch on fire

• REACTION TO WATER (H2O) it responds to the water fast in the beginning but slowly the reaction slows down due to the feeling of your calcium

• REACTION TO ACIDS it is exceedingly reactive

Good luck on your assignment and enjoy your day!

~LoveYourselfFirst:)

5 0
4 years ago
Read 2 more answers
What happens with valence electrons to form a chemical bond?
dybincka [34]

Answer:

A valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond. If the outer shell is not closed; in a single covalent bond. Both atoms in the bond contribute one valence electron in order to form a shared pair.

(Hope this helps) Sky

5 0
4 years ago
28 ml of 0.10 m hcl is added to 60 ml of 0.10 m sr(oh)2. determine the concentration of oh− in the resulting solution.
Blababa [14]
Here is an acid-base reaction. Hydrochloric acid (HCl) reacts with strontium hydroxide [ Sr(OH)2 ]

Ions H+ and OH- neutralize each other. If the amounts are not equal, one of them will be in excess. 
Follow the steps as

1. Find moles of ions: mole= Molarity * Volume (in liter) ; n= M * V OR millimole = Molarity * Volume (in ml) ;
2. Write the equation
3. Find out excess ion
4. Use final volume (V acid + V base ) to calculate concentration of excess ion.

n HCI = 28 ml * 0.10 M = 0.28 mmol, releases 0.28 mmol H+ ions
n Sr(OH)2= 60 ml * 0.10 M= 0.60 mmol, releases 2* 0.60=1.20 mmol OH- ions
since Sr(OH)2⇒ Sr2+ + 2OH-

Neutralization reaction is OH- + H+ ---> H2O. The ratio is 1:1. That means 1 mmol hydroxide ions will neutralize 1 mmol hydrogen ions. Since OH- ions are greater in amount, they will be in excess

n(OH-) - n(H+)= 1.20 - 0.28 = 0.92 mmol OH- ions UNREACTED.

Total volume= V acid + V base= 28 ml + 60 ml = 98 ml

Molarity of OH- ions= mole / Vtotal = 0.92/98= 0.009 M

The answer is 0.009 M.


5 0
3 years ago
Read 2 more answers
What element has 1 energy level and 2 valence electrons
Anvisha [2.4K]

Answer: Hydrogen and helium

Explanation:

3 0
3 years ago
What mass of potassium hydroxide is required to react completely with 2.70 grams of sulfuric acid to produce potassium sulfate a
Reptile [31]
1) first, write the balanced equation:

2KOH + H₂SO₄ ---> 2H₂O + K₂SO₄

2) convert grams of sulfuric acid to mole using it's molar mass. 

molar mass H₂SO₄= (2 x 1.01) + 32.0 + (4 x 16.0)= 98.0 g/mol

2.70 grams (1 mol/ 98.0 grams)= 0.0276 moles

3) use the mole to mole ratio from the balanced equation to change the moles of sulfuric acid to moles of potassium, hydroxide (KOH).

ration--->2 mol KOH = 1 mol H₂SO₄

0.0276 mol H₂SO4 (2 mol KOH/ 1 mol H₂SO₄)= 0.0551 mol KOH

4) convert moles to grams using the molar mass of KOH

molar mass of KOH= 39.1 + 16.0 + 1.01= 56.1 g/mol

0.0551 mol (56.1 grams/ 1 mol)= 3.09 grams

8 0
4 years ago
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