During an investigation, a scientist heated 123.6 g of copper carbonate till it decomposed to form a black residue. The total mass of the black residue formed was 79.6 g. Does the law of conservation of mass hold true in this case? Use complete sentences to justify your answer based on numerical calculations.
When copper carbonate is heated, it decomposes to form a black residue. This black residue is actually copper(II) oxide. Along with this black residue, carbon-dioxide is released. The complete reaction is the following:
[tex]CuCO_3\to CuO(s)+CO_2(g)[/tex]
The law of conservation of mass holds true. 123.6 g of copper carbonate decomposes to 79.6 g of copper oxide and (123.6 g-79.6 g=44 g) 44 g of carbon-dioxide.
Answer:
The law of conservation of mass holds true.
Explanation:
123.6 g of copper carbonate decomposes to 79.6 g of copper oxide and 44 g of carbon-dioxide.
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The difference between a hypothesis and an inference
A mouse is moving in a straight line at a steady speed of 2 m/sec for 10 seconds. How far (in meters) did the mouse travel?
a brick dropped from 78m high scaffold. what is the velocity as the brick hits the pavement? show work.
Answer:
39.09987212m/s
This is the ans.
Which of the following happens when unbalanced forces act on an object? The object remains stationary. The object moves with the same velocity. The object moves in the direction of the stronger force. The object's speed and direction of motion remain unchanged
The object move in the direction of the stronger force is the answer.
What are balanced and unbalanced forces?balanced force when two individual forces are of the same magnitude and point in opposite directions. We talk about unbalanced forces on an object only if there is a single force of the same magnitude but not balanced by opposite forces.
If the resultant force of all the forces acting on an object is not zero, the forces will be imbalanced. Power. These forces change the stationary state or the uniform movement of the body. Example: Push a toy car lying on the ground and it will start moving with one side force.
The object move in the direction of the stronger force happens when unbalanced forces act on an object
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The New York Wheel is the world's largest Ferris wheel. It's 183 meters in diameter and rotates once every 37.3 min.
Find the magnitude of the average acceleration at the wheel's rim, over a 8.60-min interval.
What is the only truly liquid layer of the earth?
A) inner core
B) outer core
C) lower mantle
D) Upper Mantle
Which of the following is an example of changing the impulse of a collision?
Question 2 options:
A boxer turning his head while being punched.
A truck smashing into two-layered retaining wall.
Removing mass from a ship before it collides with an iceberg.
A sugar-glider slowing down mid-air before hitting the ground.
A paper clip is pushed horizontally off a table with speed 1.5m/s. If the table has a height of 1.1m how far from the table does the paper clip land?
A. 1.4m
B.1.1m
C. 0.47m
D.0.71m
improvements in which area would help reduce the possibility of change to the environment when using uranium as a fuel ?
IN THIS FORMULA FOR WATER WHAT DOES THE SUBSCRIPT 2 INDICATE
Read the given list of organisms.
deer, sheep, wolf, cattle, insects
What best describes the role of these five organisms in a food web?
Carnivores, as they all eat meat
Herbivores, as they all feed on plants
Consumers, as they all make their own food
Consumers, as they all obtain food from plants or animals
Answer:
the answer would be B
Explanation:
all the animals are plant eaters or herbivores
You have discovered a meteorite that seems to be metallic. Its mass is 370 g, and you calculate the volume to be 50 cm3. Based on the three values provided, which metal would most likely match the composition of the meteorite?aluminumironleadnone of these (density is less than 1.0)
Please Help
Scientists have observed earths tectonic plates move in predictable directions. What is the cause of this observation?
A. Uniform pressure inside earths forces the plates to move.
B. Uniform temperature inside earth forces the plates move.
C. Variations in temperatures inside earth forces plates to move.
D. Vibrations in the core forces the plates to move.
Answer:
C Variations in temperatures inside earth forces plates to move.
Explanation: its Approved 2021
Which question about the discovery of the earth revolving around the sun could be best answered using scientific inquiry
In order to scientifically demonstrate that Earth is spherical, one can measure the Earth's curvature, conduct gravity experiments, utilize satellite imagery, and observe the change in constellations at different latitudes.
Explanation:The question that could be best answered using scientific inquiry about the discovery of the Earth revolving around the sun would be: Give four ways to demonstrate that Earth is spherical.
Measure the Earth's curvature using a long-distance view, such as observing a ship disappearing over the horizon.Conduct experiments with gravity, such as observing the shape of water in a container or using a plumb line to measure verticality.Utilize satellite imagery or photos taken from space to show the Earth's spherical shape.Observe the change in constellations as you move away from the equator, which can only be explained by Earth's sphericity.Marisa's car accelerates at an average rate of 2.6m/s2. How long will it take her car to accelerate from 24.6m/s to 26.8m/s?
What helped provide support for the Plate Tectonic theory in the 1960s?
A) Detailed research of the ocean floor
B) Shape of the continental coastlines matching up together
C) Mountain ranges that seem to match up on different continents
D) Mineral and fossil matches from tests done on different continents
as the moon changes appearance during the month, it follows a pattern. describe the pattern.
Moon can go through phases from quarter to half to three-forth to a full moon.
What is Full moon?When the moon is in its full brightness and its whole disc is illuminated.
The Moon reflects its light from the Sun. Only the part of the Moon that faces the Sun is visible. As the Moon revolves around the Earth, its shadow covers part of its surface. The full moon occurs when the entire moon is visible. A quarter way through the cycle, half of the moon is visible, known as the first quarter. When the Moon seems to disappear, which is known as a new moon or no moon.
Thus, Moon can go through phases from quarter to half to three-forth to a full moon.
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A cat napping on a window sill demonstrates which scientific concept?
A) Force
B) Velocity
C) Inertia
D) Speed
Use the following terms in the same sentence:proton, neutron ,and isotope
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The many volcanoes located along the edge of the Pacific Ocean make up the Ring of Fire. How does subduction play a role in the volcanic activity in the Ring of Fire? Make a full paragraph!
Answer:
When two plates collides of varying densities, one tends to subduct introducing volcanic material to the earth surface.
Explanation:
The ring of fire is a geographical area where seismic and volcanic activities are prevalent. This region extend around the edge of the pacific plates and including smaller plates like the Juan de Faca plate, coccus plate and the Philippine plate . The ring of fire is a place known for earthquake and volcanism due to the active plate boundary.
The plate boundaries around the rings of fire are known for subduction activities.
Usually, in a convergence boundary where continental crust collides with oceanic crust the more dense oceanic crust tends to subduct. The continental crust is less dense and possess more buoyancy. The less dense and buoyant nature of the continental crust will cause it to override the oceanic crust.
Generally, when oceanic crust and continental crust collides the oceanic crust subduct reaching the aesthenosphere area, Aesthenosphere material like magma are introduced to the earth surface through the subduction zone. The magma may creep through cracks and fissures or erupt to the earth surface. The subduction zone form trenches which is a prerequisite for creating mountains, volcanisms and earthquakes.
melting wax
evaporating gasoline
freezing water
These changes are all examples of
A) nuclear changes.
B) physical changes.
C) chemical changes.
D) energy consumption.
18)
The process of deposition causes
A) rock and soil to slowly be lost.
B) rock and soil to quickly be lost.
C) rock and soil to slowly be gained.
D) rock and soil to quickly be gained.
19)
Roberto's family went to the coast of Georgia. While they were there, Roberto noticed that the rocks close to the water were smooth, and the rocks farther away from the water had more jagged edges. What MOST LIKELY caused the rocks to be smooth instead of rough?
A) birds pecking at the rocks
B) fish swimming over the rocks
C) the sun shining on the rocks
D) waves crashing down on the rocks
20)
Deposition is a process that involves wind carrying sediment and then depositing it in a particular place. One common beach sight formed by deposition is a
A) reef.
B) sand dune.
C) sand castle.
D) barrier island.
21)
batteries properties
Battery Brand average life cost
A 12 hours $0.50
B 18 hours $2.00
C 24 hours $3.50
If a battery is needed for a smoke detector where the biggest priority is for the device to last as long as possible, then which brand is the best choice?
A) Battery A
B) Battery B
C) Battery C
D) All 3 brands are equally good choices.
Eliminate
23)
About 21% of Earth's atmosphere is composed of oxygen. Oxygen can combine with other substances. The chemical reaction of oxygen with other substances is called oxidation and it is a source of chemical weathering. The building on the left has undergone oxidation. Compare the picture on the left with the picture on the right. The building has changed. The rock has changed much like the building.
Describe how the rock on the right has changed over time.
A) Chemical weathering has happened due to acid rain in the area.
B) Oxygen has chemically reacted with minerals in the rock; oxidation has occurred.
C) Water in the atmosphere has caused the rock to rust; it has physically weathered.
D) Physical weathering has taken place and the rock is broken down into smaller pieces.
Eliminate
What occurs when an object vibrates in response to sound waves of a certain frequency?
answer: resonance
Explanation: APHEX
Instrument that I used to open locks
By definition, we have to:
A key is an element commonly used to open locks where there are some objects that are intended to protect
Theodore of Samos in the seventh century BC invented the keys.
The largest number of keys used are metal (steel or aluminum), its use is to open the lock by entering it and turning.
Answer:
Instrument that I used to open locks is:
The keys.
What is a main reason why the scientific model of atoms is considered a theory rather than a law?
It has been proven as a fact.
It has been changed over time.
It predicts but does not explain.
It has stayed the same for a long time.
HELP ME PLEASE!!!!
B. It has changed over time.
Decrease in amount of time that you spent exercising is a form of overloading training true or false
What has to be true about mass if a small object (like a metal ball) has a high density? A: The mass has to be high compared to the volume. B: The mass has to be low compared to the volume. C: The mass is not related to the density. D: The mass would be determined by throwing the ball in water.
Answer:
the mass must be high compared to the volume
Explanation:
i just took a test and got 100%
How much force is needed to accelerate a 66 kg skier at 2 m/sec2? A) 132 kg B) 33 N C) 0.03 kg D) 132 N
How did the mechanical legs using to building robots reassemble the walking motions how are they different
why does trapped air in a vacuum flask reduce heat loss by conduction?
Answer:
Explanation:
The answers are:
1) D
2) B
3) D
4) C
5) A
6) A
7) D
8) D
9) A
10) B
11) C
12) C
13) C
14) B
15) B