Prior to determining the experimental design, a scientist typically? A. makes observations. B. forms a hypothesis. C. performs an experiment. D. predicts the result of an experiment.

Answers

Answer 1

Answer:

Prior to determining the experimental design, a scientist typically forms a hypothesis. The answer is letter B. this is to prepare the scientist, the possible outcome of their research before the experimental design whether they are wrong or not.

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A170 g hockey puck sliding at 25 m/s slows to a speed of 10 m/s in a distance of 7.5 m. Determine the force of friction causing the puck to slow.
Gravity causes___ objects to accelerate

6 questions:What percentage of the earth is covered by water?

Did dinosaurs and humans ever exist at the same time?

What is Darwin's theory of the origin of species?

Why is the sky blue?

What causes a rainbow?

Why does a year consist of 365 days and a day of 24 hours?

Answers

For question 1: What percentage of the earth is covered by water?

Your answer for question 1: About 71 percent of the earth's surface is covered by water.

For Question 2: Did dinosaurs and humans ever exist at the same time?

Your answer for question 2: No. Dinosaurs went extinct at the end of theCretaceous period, 65 million years ago. Modern humans did not appearuntil around 200,000 years ago.

For question 3: What is Darwin's theory of the origin of species?

Your answer for question 3: Darwin's theory of species origination says thatnatural selection chooses organisms that possess variable and heritabletraits and that are best suited for their environments.

For question 4: Why is the sky blue?

Your answer for question 4:
Solar radiation sunlight is scattered across theatmosphere by a process called diffused sky radiation. The sky is bluebecause much more short-wave radiation, blue light, is scatteredacross the sky than long-wave radiation, red light.

For question 5: What causes a rainbow?

Your answer for question 5: Rainbows can be seen when there are water droplets in theair and the sun is shining. Sunlight, which contains all colors, isrefracted, or bent, off the droplets at different angles, splittinginto its different colors of red, orange, yellow, green, blue, indigoand violet.

For question 6: Why does a year consist of 365 days and a day of 24 hours?

Your answer for question 6: A year, 365 days, is the time it takes for the Earth totravel around the Sun. A day, 24 hours, is the time it takes for theEarth to spin around once on its axis.

Hope all of this helps you today

What type of reaction is shown below? Ba(OH)2 + 8H20 + 2NH4NO3 + heat ?10H2O + 2NH3 + Ba(NO3)2

Answers

Double Displacement Reaction

An element from each of two compounds switch places.
Example: compound + compound ⇒ compound + compound

Chemical reactions are processes in which substances change into other substances. A chemical reaction takes place if one or more of these occur:
Color changes - Different combinations of molecules reflect light differently. A color change indicates a change in molecules.
Heat content changes- In all chemical reactions, the heat content of the reactants and the heat content of the products is never the same. Sometimes the difference is great and can be easily detected. At other times, the difference is slight and more difficult to detect.
Gas produced - Whenever a gaseous product forms in a liquid solution, bubbles can be seen. A colorless gas produced in a reaction of solids is much harder to detect.
Precipitate forms- Precipitates are insoluble products formed by a reaction taking place in a liquid solution. This insoluble product will eventually settle to the bottom, but might immediately appear by turning the clear solution cloudy.

Answer:

Endothermic.

Explanation:

I took the same test and this was the correct answer.

I hope this helps you!

The number of electrons in the outer ring of the elements phosphorus,iodine,vanadium,cobalt,sodium,nitrogen,helium,gold,zinc

Answers

helium will have 2 electrons
sodium will have 1 electron.

m8, the outer shell is called the valence shell, and it can be be found by looking at which peirod the element lies in

Suppose you are looking at a scene that has mountains near the ocean. where do u think the crust should be the thickest?

Answers

the crust is thicker on land so mountains

A mirror with a flat surface is aA. plane mirror.
B. convex mirror.
C. concave mirror.
D. virtual mirror.

Answers

This kind of a mirror is called a Plane mirror.

Other types mentioned here are not flat surfaces.

Answer:

The correct answer is option A, Plane Mirror

Explanation:

A plane mirror has a flat surface while remaining concave and convex mirror have bulging surfaces. A concave mirror is a converging mirror while a convex mirror is a diverging mirror. Having a planar surface, the angle of incidence and reflection is equal in a plane mirror. There is nothing like a virtual mirror however the mirrors have the ability to form virtual image.

Thus among all the options, option A is correct

Which is most likely a molecule in a wall-filling material? C6H6 Na6Ba6 NeNa HC

Answers

Answer:

C6H6

Explanation:

I took the test a while ago I think I got it right

Answer:

C6H6

Explanation:

I tried it and it worked

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A flowerpot weighing 2 kilograms, what will be its speed at the end of 5 seconds?

Scientists think that a few hundred million years or so after the Big Bang, space cooled off enough for matter to form. This matter spread out around the universe with no structure. But each little bit of matter exerted the force of _____ on each other little bit.

A skater goes down a hill with a constant acceleration of 2.25 m/s2 for 50 meters. If the skater's final velocity was 20 m/s, calculate her initial velocity.

Imagine that you are sitting in a closed room (no windows, no doors) when, magically, it is lifted from Earth and sent accelerating through space with an acceleration of 1g (9.8 m/s2). According to Einstein's equivalence principle, which of the following is true?You won't feel any change and will have no way to know that you've left the earth.You'll feel a force that will cause your head to repeatedly bang into the ceiling.You'll know that you left the Earth because you'll be floating weightlessly in your room.You'll know that you left the Earth because when you drop a ball it will fall sideways.