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Vlada [557]
2 years ago
9

Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the

Chemistry
1 answer:
Ira Lisetskai [31]2 years ago
3 0

Answer: B aka #2

Explanation:

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How do you know something is there if you can't see it?
aliina [53]

Answer:

Explanation:

Use your other senses such as touch or smell, does it react in different temperatures, is it then visible under a microscope, does it react with different elements or gases?   Think outside the box.

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2 years ago
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If the human body were a car, glucose would be:
NeTakaya
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8 0
2 years ago
Compare the type of change that occurs when an iron bar rusts and when a substance freezes.
Ivanshal [37]

Explanation:

when an iron bar rust is an example of a chemical change in which a new substance is formed and the change is not easily reversible.for iron to rust moisture and air must be present.while when a substance freezes,it can be easily reversed through melting and no new substance is formed.this change is termed a physical change.

5 0
2 years ago
What force is necessary to accelerates a 1250kg car at a rate of 40 m/s
zalisa [80]

Answer:

F = 50000 N

Explanation:

The acceleration is rate of change of velocity of an object with respect to time.

Formula:

a = Δv/Δt

a = acceleration

Δv = change in velocity

Δt = change in time

Units:

The unit of acceleration is m.s⁻².

Acceleration can also be determine through following formula,

F = m × a

a = F/m

Given data:

Mass of car = 1250 Kg

Acceleration = 40 m/s².

Force = ?

Solution:

F = m × a

F = 1250 Kg ×  40 m/s²

Kg.m/s² = N

F = 50000 N

8 0
3 years ago
. Which type of energy is involved in the operation of simple machines?
quester [9]
Input an output  energy
4 0
3 years ago
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