Answer:
the answer solutions tests I think
Science
The theory of continental drift states that the land masses called continents were once closer together and have drifted apart over time. Which circumstance is the strongest evidence in support of this theory?
Select one:
the periodic climate changes of Earth
the migration patterns of birds
the large variety of animals on each continent
the similarity of fossils on different continents
Answer:
D or the fourth choice.
Explanation:
What is the largest contributor to the greenhouse effect?
Answer:
burning of fossil fuels
Explanation:
Which of the following reactions best illustrates the Law of Conservation of Matter?
A.) H2O2H2O + O2
B.) Na + CuS Na2S + 2Cu
C.) K + AgCl KCl + Ag
D.) NaOH + 2HCl NaCl + H2O
Answer:
answer A..) H2O2HO+O2
Help me guys plzlzlz
i think its d because 900+1200 is 2100, but im probably wrong for question 1
Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer
Answer:
i need a picture of ur question
Explanation:
Choose all the answers that apply.
The sun _____.
a. creates energy from fission reactions
b. creates energy through fusion reactions
c. transfers heat through radiation
d. is made of hydrogen and helium
e. uses its own mass to create energy
Help asap plz! Actual answers plz!
Describe an example of an action and reaction. Identify the forces and their directions.
Answer:
An example of action is there is a fire and reaction is you running
Explanation:
How do matter and energy move through an ecosystem?
My scientific explanation is:
Your answer should include at least 1-2 complete sentences to explain the claim, evidence and reasoning.
Be sure to check your grammar and spelling.
Use the Sentence Starter to help you:
Matter and energy move through an ecosystem by...
Answer:
Decomposers (organisms that break down dead producers and consumers and organic waste) obtain the energy they need to live from chemical bonds of the dead and waste-matter. The energy is transferred both to the decomposer (for growth and development) and to the ecosystem (as heat energy)
Explanation:
A student used a portable electric drill to remove screws from a broken wooden table. He noticed that the screws holding the table together were warm to the touch after being removed from the wood. Which statement best explains this phenomenon?
A:Electrical energy from the drill was converted into chemical energy due to conductivity.
B:The process of removing the screw concentrated the thermal energy that was already present in the wood
Answer:
A.
Electricity can travel through metal, such as the screws, creating a conductor.
jenny turned on the fan in her bedroom. what energy transformation took place when she turned on the fan
Answer:
Kinetic energy
Explanation:
Kinetic energy is energy when something is in motion
Uranium is a radioactive element that is highly unstable and it has a half-life of 4.5 billion years. Uranium comes in many different forms (shown below). Looking at the nuclear notations below, what is the neutron number of both of the elements below? What is the relationship of the two elements below?
A: U-235 has 235 neutrons, U-238 has 238 neutrons and they are isotopes of each other.
B: U-235 has 143 neutrons, U-238 has 146 neutrons and they are isotopes of each other.
C: U-235 has 235 neutrons, U-238 has 238 neutrons and they are ions of each other.
D: U-235 and U-238 have 92 neutrons and they are ions of each other.
Answer: c
Explanation:it just is
U-235 has 235 neutrons, U-238 has 238 neutrons and they are ions of each other. So the correct option is C.
What is uranium?Since more than 60 years ago, uranium, a heavy metal, has been employed as a plentiful source of concentrated energy. Uranium is as prevalent in the Earth's crust as tin, tungsten, and molybdenum, and it can be found in most rocks in quantities of 2 to 4 parts per million.
Seawater contains uranium, which may be extracted from the seas. German scientist Martin Klaproth made the discovery of uranium in the mineral pitchblende in 1789. Following the discovery of the planet Uranus eight years earlier, it was given that name.
In supernovae, uranium is thought to have been created around 6.6 billion years ago. Even though slow radioactive decay is uncommon in the solar system, it is the primary source of heat inside the Earth today, creating convection and continental drift.
Due to its great density, uranium is also used as radiation shielding, as counterweights for aviation control surfaces, and in boat keels. The melting point of uranium is 1132 °C. Uranium has the chemical symbol U.
Therefore the correct option is C.
Read more about uranium, here
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HELP PLS THIS IS DUE IN 15 MINUTES PLS PLS PLS!!! I WILL MARK BRAINLIEST IWTH THE BEST ANSWER!!!
List 2 Physical Changes & 2 Chemical Changes and explain why.
Answer:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
Explanation:
Answer:
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.
physical changes are boiling, melting, freezing, and shredding.
Explanation:
Which of the following statements is true?
a. An insulator speeds up the transfer of heat.
b. Radiation is the transfer of heat in solids.
c. All moving objects experience friction.
d. All work gains some energy as heat.
Answer:
C is correct
Explanation:
For example, you move your hands together you are creating friction.
Which biome has the greatest biodiversity, and why?
MY TEACHER ASKED ME THIS AND WE HAVEN'T EVEN LEARNED ABT THIS!!! PLS HELP I WON'T ACCEPT FAKE ANSWERS I WILL FLAG THEM AS FAKE :
Before you can solve a problem, the first thing you have to do is Question 2 options:
define the problem
build a prototype
design your solution
test your solution
What is an important characteristic for chemicals released into the environment used to seed clouds?
Answer:
the rain
Explanation:
WILL GIVE BRAINLIEST! What greenhouse gas most controls the temperature? And when is it released?
Answer:
1: carbon dioxide
2: As hydrocarbon fuels (i.e. wood, coal, natural gas, petrol and oil) are burnt, carbon dioxide is released. During combustion or burning, fossil fuel carbon mixes with oxygen in the air to create carbon dioxide and water vapor.
Explanation: hope it helps
1. reaction that releases heat
outer ear
2. flow of electrons through a material toward a positive charge
compression
3. build up of electrons in a material
static electricity
4. part of the ear is responsible for capturing sound waves
exothermic
5. part of the sound wave where the molecules are pressed closely together
current electricity
If all three metals were exposed to extremely high temperatures, which would be the last to melt? (copper, gold, mercury)
Answer:
mercury
Explanation:
From these three metals, mercury would melt the fastest. Its kinda like water, it changes states quickly unlike gold and copper
The starting temperature of the hot water was 70.1°C. The starting temperature of the ice sphere was 0.5°C. The final temperature of the dyed water is NOT half way between those numbers. In fact, it's much higher.
Why did this happen?
Answer:
because the temputare seemed to drop a lot.
Explanation:
so maybe there was a cold front that came in over time or over night and the rain was what caused it to drop down...