Kim is a forensic scientist. She has been asked to identify a chemical compound that was found at the scene of a crime. Which of these pairs of properties would be most helpful in identifying the unknown compound?A) color, mass
B) boiling point, volume
C) flammability, volume
D) melting point, reactivity with water
Plz answer this question quickly, it’s really important
Answers
I believe the correct answer is D. melting point, reactivity with water.
Related Questions
How do the circulatory system and the respiratory system work together?
A laboratory technician was examing a blood sample from a patient.He found a rare parasite that would cause the nausea and vomiting that the patient was experience which career pathway is being describe ?
Why are adaptations important to organisms?
Explain why the gravitational acceleration of any object near earth is the same matter what was the mass of the object
3.4 x 10-N, how far did it fly?
Answers
Answer:
2.6 m
Explanation:
The work done by the bird is given by
where
F is the force exerted
d is the distance covered
In this problem, we know:
is the work
is the force
Solving the equation for d, we find the distance covered by the bird:
Final answer:
The Cuban bee hummingbird flew approximately 2.59 x 10^-2 meters.
Explanation:
To determine the distance the bird flew, we can use the equation: work = force x distance. Rearranging the equation, distance = work / force. Plugging in the values, we have distance = (8.8 x 10-4 J) / (3.4 x 10-2 N). Solving this equation gives us a distance of approximately 2.59 x 10-2 meters.
Learn more about Calculating distance using work and force here:
#SPJ3
Answers
with the same generator, so the only factor for producing
the slectric field is only the speed. The faster the rotational speed of the
generator the greater it produce electric field. So the sequence is 3000 rpm
< 3200 rpm < 3400 rpm < 3600 rpm
a butterfly has a wingspan of 66mm and a height of 6cm which i greater its wingspan or its height
Answers
Answers
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11) If Galileo had dropped a 5.0 kg cannon ball to the ground from a height of 12 m, the change in PE of the cannon ball would have been product of mass(m),acceleration(g)and height(h)
The change in PE =mgh=5*9.8*12=588 J
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12.) The 2000 Belmont Stakes winner, Commendable, ran the horse race at an average speed = v = 15.98 m/s.
Commendable and jockey Pat Day had a combined mass =M= 550.0 kg,
Their KE as they crossed the line=(1/2)Mv^2
Their KE as they crossed the line=0.5*550*(15.98)^2
Their KE as they crossed the line is 70224.11 J
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13)Brittany is changing the tire of her car on a steep hill of height =H= 20.0 m
She trips and drops the spare tire of mass = m = 10.0 kg,
The tire rolls down the hill with an intial speed = u = 2.00 m/s.
The height of top of the next hill = h = 5.00 m
Initial total mechanical energy =PE+KE=mgH+(1/2)mu^2
Initial total mechanical energy =mgH+(1/2)mu^2
Suppose the final speed at the top of second hill is v
Final total mechanical energy =PE+KE=mgh+(1/2)mv^2
As mechanical energy is conserved,
Final total mechanical energy =Initial total mechanical energy
mgh+(1/2)mv^2=mgH+(1/2)mu^2
v = sq rt [u^2+2g(H-h)]
v = sq rt [4+2*9.8(20-5)]
v = sq rt 298
v =17.2627 m/s
The speed of the tire at the top of the next hill is 17.2627 m/s
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14.) A Mexican jumping bean jumps with the aid of a small worm that lives inside the bean.
a.)The mass of bean = m = 2.0 g
Height up to which the been jumps = h = 1.0 cm from hand
Potential energy gained in reaching its highest point= mgh=1.96*10^-4 J or 1960 erg
b.) The speed as the bean lands back in the palm of your hand =v=sq rt2gh =sqrt 0.196 =0.4427 m/s or 44.27 cm/s
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15.) A 500.-kg horse is standing at the top of a muddy hill on a rainy day. The hill is 100.0 m long with a vertical drop of 30.0 m. The pig slips and begins to slide down the hill.
The pig's speed a the bottom of the hill = sq rt 2gh = sq rt 2*9.8*30 =sq rt 588 =24.249 m/s
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16.) While on the moon, the Apollo astronauts Neil Armstrong jumped up with an intitial speed 'u'of 1.51 m/s to a height 'h' of 0.700 m,
The gravitational acceleration he experienced = u^2/2h = 2.2801 /(2*0.7) = 1.629 m/s^2
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EDIT
1.) A train is accelerating at a rate = a = 2.0 km/hr/s.
Acceleration
Initial velocity = u = 20 km/hr,
Velocity after 30 seconds = v = u + at
Velocity after 30 seconds = v = 20 km/hr + 2 (km/hr/s)*30s =
Velocity after 30 seconds = v = 20 km/hr + 60 km/hr = 80 km/ hr
Velocity after 30 seconds = v = 80 km/hr=22.22 m/s
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2.) A runner achieves a velocity of 11.1 m/s 9 s after he begins.
His acceleration = a =11.1/9=1.233 m/s^2
Distance he covered = s = (1/2)at^2=49.95 m
Answers
Most famous Michelson-Morley (1887) demonstrated that light travels at the same speed regardless of whether it was measured in the direction of the Earth's motion or at right angles to it. When the light travels through a vacuum: It moves from medium to medium (example: air to glass) speed can change depending of the new medium's index of refraction and the "bending" of light is essentially how lenses work.
An example of a light medium wave is Speed of light.
B.mantle convection
C.subduction
D.trench formation
Answers
Answer:
The correct option is (B)mantle convection
Explanation:
Tectonic plates at the earth's surface move because of the intense heat in the Earth's core. this heat causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell and producing a movement called mantle convection which is the slow creeping motion of Earth's solid silicate.