This includes situations when the speed, the direction, or both change. For example, when a car accelerates, the driving force from the engine is greater than the resistive forces. The resultant force is not zero.

Explanation:

3 0

3 years ago

which is the correct order of ease of carbon dioxide production by heating the group II metal carbonates?

seraphim [82]

Which is the correct order of ease of carbon dioxide production by heating the group II metal carbonates?

A) $BaCO_{3} > SrCO_{3} > CaCO_{3} > MgCO_{3}$

B) $MgCO_{3} > CaCO_{3} > SrCO_{3} > BaCO_{3}$

C) $CaCO_{3} > MgCO_{3} > BaCO_{3} > SrCO_{3}$

D) $SrCO_{3} > BaCO_{3} > CaCO_{3} > MgCO_{3}$

Answer:

Explanation:

The correct option is A:

$BaCO_{3} > SrCO_{3} > CaCO_{3} > MgCO_{3}$

On the periodic table, carbonates required stronger heating as one does down the groupings in order for them to decompose. The implication is that the stability of compounds will increase from $MgCO_{3}$ to $BaCO_{3}$ .

So the carbonates will be stable according to the following order:

$BaCO_{3} > SrCO_{3} > CaCO_{3} > MgCO_{3}$ , thus making B the correct answer.

Cheers

3 0

3 years ago

Convert 85km/hr to cm/s(factor label conversion)

dezoksy [38]

Answer:

23.61m/s

Explanation:

Km/hr is a unit of expressing the speed of a body. Speed is the rate of change of distance with time. Also, the same unit is applicable for expressing the velocity of a body. But to find the velocity, we must emphasize the direction of motion of the body.

Given parameter:

85km/hr to cm/s

Note:

1000m =1km

3600s = 1hr

So;

85 x

Cancelling out km and hr;

= 85 x 0.278m/s

= 23.61m/s

5 0

3 years ago