PHYSICS HIGH SCHOOL

A lithium oxide compound is represented by which formula?

Answers

Answer 1
Answer: Li2O is the molecular formula for lithium oxide.
Answer 2
Answer:

the answer is Li2O

good luck

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I WILLL MARK YOUUUUUUU HELPPPPAcceleration due to gravity on the moon is 1.6 m/s2. If a person has a mass of 65 kg on Earth, what is their weight on the moon?

Answers

Answer:

weight of the moon = mass × gravity

= 65kg × 1•6

=104N/kg

Answer:

10.75 kg

Explanation:

moon = (weight on earth/9.81m/s^2)*1.622m/s^2

Which of these statements is true? A.
Some molecules may contain no atoms.


B.
Some elements found in nature exist as molecules.


C.
Some compounds include only one type of element.


D.
Some atoms are made of two or more different elements.

Answers

B). Some elements found in nature exist as molecules. 
That is, their atoms travel around in bound pairs. 
Examples are Hydrogen, Oxygen, and Nitrogen.

A). No.  Without atoms, you can't make a molecule.

C). No.  A compound is a chemical combination of two or more elements.

D). No.  An atom is the smallest unit of ONE single element.

Hello, your answer is, C. Some compounds include only one type of element.

I hope it helped!

Suppose you ride your bicycle to the library traveling at 0.5 km/min. It takes you 25 minutes to get to the library. How far did you travel?

Answers


If you cover 0.5 km every minute, and keep it up for 25 minutes,
then you will cover

0.5  +  0.5  +  0.5  +  0.5  +  0.5  +
0.5  +  0.5  +  0.5  +  0.5  +  0.5  +
0.5  +  0.5  +  0.5  +  0.5  +  0.5  +
0.5  +  0.5  +  0.5  +  0.5  +  0.5  +
0.5  +  0.5  +  0.5  +  0.5  +  0.5     =   12.5 km.

An easier way to write the same thing is

             (25) times (0.5 km)  =  12.5 km.

An explosion occurs 340 km away. Given that sound travels at 340 m/s, the time the sound takes to reach you is a. 1 s.
b. 10 s.
c. 100 s.
d. 200 s.
e. more than 200 s.

Answers


(340,000 meters) / (340 meters/sec)  =  1,000 seconds

That's more than 200 sec.
first convert 340km into 340,000m, and 340000/340=1000. So the answer is e.

pyrex graduated cylinder has a volume of exactly 200 ml at 0° celsius. if it's temperature increased to 100° celsius what's volume increase or decrease compute the change in volume ?

Answers

1. The volume will increase.

2. The change in the volume is 73 mL

1. Determination of the nature of the new volume.

From the question given above, the following data were obtained:

  • Initial volume (V₁) = 200 mL
  • Initial temperature (T₁) = 0 °C = 0 + 273 = 273 K
  • New temperature (T₂) = 100 °C = 100 + 273 = 373 K
  • New volume (V₂) =?

Using the Charles' law equation, the new volume of the cylinder can be obtained as follow:

V₁ / T₁ = V₂ / T₂

200 / 273 = V₂ / 373

Cross multiply

273 × V₂ = 200 × 373

273 × V₂ = 74600

Divide both side by 273

V₂ = 74600 / 273

V₂ ≈ 273 mL

From the above calculation, we can see that the new volume increased.

2. Determination of the change in the volume.

The change in the volume can be obtained as illustrated below:

  • Initial volume (V₁) = 200 mL
  • New volume (V₂) = 273 mL
  • Change in volume (ΔV) =?

ΔV = V₂ – V₁

ΔV = 273 – 200

ΔV = 73 mL

Learn more about Charles' law:

brainly.com/question/16927784

Steve and Carl are driving from Scranton to Bridgeport, a distance of 180 miles. If their speed averages60 miles an hour, how long will it take them to get there?
A. 3.5 hours
B. 3 hours
C. 2.5 hours
D. 4 hours

Answers

The answer is B
every hour, Steve and Carl cover 60 miles
if they need to cover 180 miles it will take them 3 hours
you can set up a proportion
60/1=180x where x is the amount of hours Steve and Carl will drive to cover 180 miles.
proportion simplifies to this:
60x=180
isolate the varible
60x/60=180/60
x=3
the answer is B 3 hours
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