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siniylev [52]
3 years ago
13

How many kilometers are there in 4.5 x 10^3 meters ?

Chemistry
1 answer:
Len [333]3 years ago
7 0
1 meter = .001 kilometers so 4.5 x 10^3 = 4500 so .001 x 4500 = 4.5 kilo
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Carbon is considered which of the following?
Zarrin [17]

Answer: atomic element

4 0
2 years ago
Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains CH4, flask B contain
erastovalidia [21]

Answer:

FLASK B WHICH CONTAINS CO2 HAS THE HIGHEST NUMBER OF MOLECULES AS IT CONTAINS THE HIGHEST MOLECULAR MASS OF 44 G/MOL.

Explanation:

Flask A contains CH4

Flask B contaims CO2

Flask C contains N2

To know the flask containing the largest number of molecules, we find the molar mass of the molecules in the flask and the largest is the one with the highest number of the relative molecular mass.

Molecular Mass of CH4 (C = 12, H =1) = ( 12 + 1*4) g/mol

= 16 g/mol

Molecular mass of CO2 (C= 12, 0= 16) = (12 + 16*2) g/mol

= 12 + 32 g/mol

= 44 g/mol

Molecular mass of N2 (N=14) = 14 * 2 g/mol

= 28 g/mol

Hence, the flask with the largest number of molecules is the flask with the highest relative molecular mass. The highest molecular mass is 44 g/mol and it is for the gas CO2 in Flask B.

So therefore, Flask B has the highest number of molecules in it.

4 0
2 years ago
Which of the following statements best describes the similarities between beryllium, magnesium,calcium, and strontium?
Schach [20]
I didn't see any statements, but here are some similarities of those elements:

They all have the same number of valence electrons, they will become cations, they all will lose 2 electrons, they will behave similarly in chemical reactions, they have similar chemical properties, they all are in the alkaline earth metal family. Hope this helps! :)
7 0
3 years ago
ONE ANSWER
Alexandra [31]

The correct answer is D. They may kick up dust and pollute Earth's atmosphere.

Explanation:

The impact of a large asteroid or comet is a major event that leads to major changes in ecosystems. One of the effects that can be expected is an important increase in dust because one of the components of asteroids and comets is dust, which would be released during the impact. Also, this dust might interact with components from the soil and the atmosphere creating a cloud, acting as a pollutant. According to this, the expected effect is "They may kick up dust and pollute Earth's atmosphere"

7 0
3 years ago
Read 2 more answers
When liquid water freezes into solid ice in the freezer,
AlexFokin [52]

Answer:

What about it? I don't get the question

4 0
3 years ago
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