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alekssr [168]
3 years ago
13

Give the symbol for an element that is:__________

Chemistry
2 answers:
aleksandr82 [10.1K]3 years ago
5 0

Answer:

a. halogen : F ,Cl ,Br l ,At

b an alkali metal: Na,Li, Rb, Cs

c. a noble gas: He, Ne, Kr, Ar

d. an alkaline earth metal: Be,Mg,Ca, Sr

hope it helps

<h2>stay safe healthy and happy...</h2>
Anna [14]3 years ago
3 0

a. Br, Cl, F

b. Na, K, Ba

c. He, Ar, Ne

d. Ca, Ba, Mg

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Jane is on a merry-go-round that is moving at a constant speed. Her velocity is also constant.
tester [92]

the correct answer is False.

6 0
3 years ago
___1___Zn + __2___HCl → ___1___H2 + ____1__ZnCl2
strojnjashka [21]

Answer:

Mass = 2.8 g

Explanation:

Given data:

Mass of HCl = 102 g

Mass of Zn = 128 g

Mass of H₂ = ?

Solution:

Chemical equation:

2HCl + Zn      →     H₂ + ZnCl₂

Number of moles of Zn:

Number of moles = mass/molar mass

Number of moles = 128 g/ 65.38 g/mol

Number of moles = 2 mol

Number of moles of HCl:

Number of moles = mass/molar mass

Number of moles = 102 g/ 36.5 g/mol

Number of moles = 2.8  mol

Now we will compare the moles of hydrogen gas with HCl and Zn.

                   HCl          :        H₂

                     2            :        1

                     2.8         :       1/2×2.8 = 1.4 mol

                   Zn          :        H₂

                     1            :        1

                     2           :         2

Number of moles of hydrogen formed by HCl are less thus it will limiting reactant.

Mass of Hydrogen:

Mass = number of moles × molar mass

Mass = 1.4 mol ×  2 g/mol

Mass = 2.8 g

7 0
3 years ago
3. A 240 mL sample of argon gas at 270 K is cooled until the volume is 180 mL. What is the new temperature?
Alexeev081 [22]

Answer:

202.5 K

Explanation:

5 0
3 years ago
Does a precipitate form when a solution of sodium acetate and a solution of ammonium sulfate are mixed together?
e-lub [12.9K]
<h3><u>Answer</u>;</h3>

No, a precipitate does not form

<h3><u>Explanation</u>;</h3>
  • Precipitation involves mixing or combining solutions that contain soluble ionic compounds to form an insoluble ionic compound by a reaction.
  • Sodium acetate and ammonium sulfate are both soluble ionic compounds, which implies that they exist as ions in aqueous solution.
  • <em><u>When they combine they form NH4CH3COOH and sodium sulfate, Na2SO4, which are both soluble salts, as all salts of ammonium and sodium are soluble.</u></em>
  • <em><u>Both ammonium acetate and sodium sulfate are soluble because there are no anions that can form an insoluble solid with NH4+ and Na+ cations. </u></em>
5 0
3 years ago
Help for number 3 pls
AfilCa [17]

Answer:

a. name of element is copper it's proton is 29 neutron is 34 and electron is 29

b.name of element is sodium it's proton is 11 neutron is 12 and electron is 11

c.name of element is chlorine it's proton is 17 neutron is 18 and electron is 17

d.name of element is iron it's proton is 26 neutron is 30 and electron is 26

8 0
2 years ago
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