Which of the following substances are NOT formed by chemical bonds?A. mixture
B. molecule
C. compound
D. pure substance
Answers
Answer:
The answer is D. pure substance.
Explanation:
A pure substance is a particular class of homogeneous matter whose composition is fixed and chemically defined, that is, it has a stable chemical composition since it is a matter that remains chemically unaltered in its different states of aggregation, endowed with properties singular and characteristic. A pure substance is composed of entities such as molecules, formular units and atoms.
Related Questions
When white light is incident on a prism, which one of the resulting color components will have the lowest index of refraction? A. Green B. Yellow C. Orange D. Blue
Momentum is distancemassforcetime times velocity.
Objects with greater mass have a weaker force of gravity between them. True False
Oil flows upward in the wick of a lantern because of the liquid property called A. density. B. meniscusity. C. viscosity. D. capillarity.
Answers
In a position vs time graph, the position is the y-axis, and the time is the x-axis.
So the slope would be position over time. Position is a distance. So the slope is distance/time, which is velocity.
And also looking at units, distance is in meters (m), and time is in seconds (s). The unit m/s is a unit for velocity.
Answers
Answers
Answer:
The change in momentum, p = -4.539 kg-m/s
Explanation:
It is given that,
Mass of the ball, m = 0.89 kg
Initial speed of the ball, u = 3.8 m/s
Final speed of the ball, v = -1.3 m/s (as it rebounds)
Let p is the change in linear momentum of the ball. We know that the linear momentum is equal to the product of mass and velocity. It is given by :
p = -4.539 kg-m/s
So, the change in linear momentum of the ball is 4.539 kg-m/s. Hence, this is the required solution.
). What's the force of gravity acting on the column of water?
A. 73,500 N
B. 102,900 N
C. 68,600 N
D. 110,700 N
Answers
Given:
liquid column is 7 meters and the area is 1.5 square meters (m2)
Required:
force of gravity
solution:
P = F/A where P is pressure, F is force and A is area
Since P = DgH where D is density, g is gravitational acceleration and H is height
DgH = F/A
F = ADgH
Let us assume D for water is 1000kg/m3
F = (1.5m2)(1000kg/m3)(9.8m/s2)(7m)
F = 102,900N
your answer is B. 102,900 N
i just took the test
a lithosphere
a biosphere
a cryosphere
Answers
the answer is bioshere
Answer:
A biosphere
Explanation:
Biosphere refers to the zone of life on a planet. It includes all living elements of a planet. It is also known as Eco-sphere and includes the interaction of all living being with their surrounding.
Of all the planets and exo-planets, Earth is the planet known to have life and thus biosphere.
Whereas atmosphere, lithosphere and cryosphere can be found on other planets as well.
Atmosphere: Layer of air and gases surrounding a planet or any celestial object. (Except Mercury, all the planets of solar system have atmosphere)
Lithosphere: it refers to the rigid outer part of the planet which includes crust and mantle. (All the rocky planets have lithosphere)
Cryosphere: portion of the planets where water is in ice form. (Many exoplanets have been discovered having cryosphere)
A trough with an amplitude of 1 will form.
A crest with an amplitude of 9 will form.
A trough with an amplitude of 9 will form.
Answers
Answer: A crest with an amplitude of 9 will form.
Explanation:
From super position principle, we know that when two waves move in same medium meet, then the net amplitude of the super imposed waves is sum of amplitudes of individual waves.
A constructive superposition takes place when crest meets crest and crest is formed of higher amplitude or trough meets trough and forms trough of higher amplitude. A destructive superposition takes place when crest of one meets trough of other -a crest or trough can form depending on the larger amplitude of either.
In the given situation, crest of wave X meets crest of wave Y. The amplitude of the super imposed wave would be = 5 + 4 = 9 and a crest would form.