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maw [93]
2 years ago
8

a child runs 60m race with an average speed of 4 m/s.how long did the child take to complete the race? give the correct unit for

your answer plz
Chemistry
1 answer:
Elis [28]2 years ago
8 0

Answer:

option c. i took the quiz

Explanation:

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If I started with 42.00 L of oxygen (O2) gas, how many grams is that?
belka [17]

Answer:

42 liters of oxygen (liquid) weighs 47900 grams.

Explanation:

5 0
2 years ago
Match these items.
notka56 [123]
Litmus is an indicator
Charged particles are ions
Acids contain H+ ions
Bases contain OH - ions
Hydronium ions are H3O+

Now, I have to take issue with the last one
A base of pH 14 is not a strong base, it would be a highly concentrated base. A strong base is a base that completely deionizes in water.

But technically, for the purpose of your answer strong base = pH 14
6 0
2 years ago
A balloon contains 11.1 g of nitrogen monoxide gas (NO). how many molecules are in the balloon?
grandymaker [24]

The number of molecules that are in balloon are = 2.227 x10^23 molecules

<h3> calculation</h3>

calculate the number of moles of NO

moles = mass/molar mass

molar mass  of NO = 14+ 16 = 30 g/mol

moles is therefore=  11.1 g/30g/mol= 0.37 moles

by use of Avogadro's constant that is

                                     1 mole= 6.02 x10^23  molecules

                                          0.37 =? molecules

=(6.02 x10^23 x  0.37 moles)/ 1mole=2.227 x10^23 molecules

4 0
3 years ago
A wind turbine generating electricity involves
Debora [2.8K]

Answer:

A. electromagnetic energy.

B. thermal energy.

C. solar energy.

D. mechanical energy.

Explanation:

6 0
2 years ago
Compare the ph of 0.1 m na2co3 and 0.1 m nahco3. select the statements that explain the difference. na2co3 is a stronger base. n
tatiyna
Na₂CO₃ is a stronger base while
Na₂CO₃ puts more OH- ion into solution
The strongest base is [H₊]= 10 - 12
The strongest acid is PH = 0.5
If an acid is added to neutral water the H₊
will increase but when an acid added to neutral water 
the OH⁻ will decrease.
6 0
2 years ago
Read 2 more answers
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