What prediction did Mendeleev make that came true less than 20 years later?

A. He predicted the atomic numbers of unknown elements.

B. He said that three new elements would be discovered.

C, He predicted that a total of 112 elements would be discovered.

D. He said that the periodic table would be developed into 18 families.

Answer:

the answer is option B

Explanation:

Answer: He said that three new elements would be discovered.

i need helpppppp asap

Define motion in your own words.

Earths axis is never tilted in the same direction as it revolves around the sun.
True or false?

Pls help due in an hour

Valence Electrons: how they increase across the Periodic table (periodic trend), and how they relate to both ionic and covalent bonding?

A decathlon is a combined event in athletics consisting of 10 track and field events
True false

which of the following is a term for the process of rock being broken down into pieces by wind or moving water?

A: Deposition
B: Compaction
C: Weathering
D: Cementation

You are a light ray and have just struck a mirror.

Use what you have learned about light and explain what will happen to you as you strike the mirror.

(Volleyball) With the underhand serve, you should follow through in the direction of:

A. The intended flight of the ball

B. Straight up above your head

C. To the side of your body

D. No follow through needed

All of the following best explain why the Sun is not the only source of energy except?
1.Energy can be converted into different forms.
2.There are different sources of energy such as biological and mechanical energy.
3.There are different forms of energy other than light energy.
4.Energy can be created and destroyed.

I’m not insane. My mother had me tested
↑
copy this sentence first one to answer get brainiest

Anyone know the answer?

there are many reasons why it is important to know what type of soil surrounds you. which of the following is not one of the reasons?

A: It helps you know what to grow
B: It helps you know what you can build
C: It helps you know what will happen when it rains
D: It helps you know when a storm will come

Please please answer this! explain the kinetic molecular theory ( i don't understand how they explain it in my lesson so if someone could simpfly it for me) worth 30 points

In a hydroelectric dam the potential energy of lake water is transformed into _ energy as it begins to more.

1. The whole world is __________________ with rocks.
2. Rocks have / have never been melted or molten at some time.
3. Bubbles / Lines in some rock were formed by chemical reactions in the rock when cool.
4. Wind and ____________________ moving over the surface break rock down into sand.
5. Soil comes from ______________________ which comes from rocks.
6. Igneous rocks come from the word _____________________ meaning fire.
7. Sedimentary rock has layers because sand / boulders are washed downstream and settle on the bottom.
8. ____________________ rock is a combination of the other two and has changed into new rock.
9. Rock can change into sand and sand can then change into ________________ over many years.
10. ________________ in farmland has a lot of living things in the top layer or horizon.
11. A huge flood happened in Washington State when a(n) ___________________ broke.
12. Only water / several things can change the shape of the land.
13. Diamonds are the _________________ substance known to us.
14. Rocks are formed by wind, ________________ heat, and water and change from one type into another.
15. Sedimentary rocks are made from sand and _____________ compressed under heat and pressure.

Rotation of players should be done how?

A. Clockwise movement

B. Counter-Clockwise movement

C. You don't have to rotate positions

D. Zigzag movement

look at the picture below to answer if u answer correctly i will mark you as brainliest.

What is the female sex cells of a plant called?
Please help! Tysm!

Why would you be able to see the earth move if you were in space? (use the
term 'reference point in your answer)

Electric Charge (guided inquiry)
Purpose: To show how matter becomes charged by induction
Materials: comb, sink with working faucet

Predict: Predict what you think will happen to the charges of the comb and water if the comb comes in contact with the water. Record your hypothesis before following the directions below to carry out the lab experiment. The charges would attract. How and why is what I don’t know.
Directions:
1. Turn on a faucet just enough to allow a thin stream of water to flow.
2. Have a student volunteer-run a comb through his/ her hair a few times.
3. Observe. Tell the student to hold the comb near, but not touching, the stream of water.
4. Answer all questions below in complete sentences, using the R.A.C.E. strategy.
Ask and record your findings: What do you observe? Describe. I observed the stream of water bend toward the comb. I gave the comb electric charge by passing a comb through my sister’s hair and that allowed the comb to bend the stream of water.


Ask and record your findings: What does this indicate (show)? Explain. I

Written response please read all and answer in complete sentences will give BRAINLIEST
Observe:
1. To test students’ predictions, have the student volunteer pass the comb through the water.
2. Then have them move the comb so that it is near but not touching the water.
Ask and record your findings: What do you observe? Describe. WILL GIVE BRAINLIEST

What does a parallel circuit look like?

Please help me with my science work

Anyone know the answers?

Look at the picture below to answer. If u answer correctly i will mark you as brainliest! To answer the question use a PERIODIC TABLE OF THE ELEMENTS.

this is due in 45 minutes :,)

what you're supposed to do is put the name of the part each letter is on

what is the main difference between a theory and a law?

ASAP right now, look at the picture it 2 question the second question it a choice all the choice it the same you just need to put them where it need to be and I will give you a Brainliest if you answer the 2 questions. Plzzz helppp

1. How does the structure of a hard-boiled egg compare to the crust, mantle, and core structure of Earth? What do the egg's layers represent? What might the cracks represent?

2. How do Earth's layers compare in composition and properties with the egg's layers?

3. Can an egg be used as a satisfactory model for Earth's lithosphere (plates) and asthenosphere, plus the rest of the mantle, and the core? How? (Hint: Look very carefully under the shell could the membrane there represent the asthenosphere?)

4. Overall, is the cracked egg a useful model for Earth? Why or why not?

5. Unlike the eggshell sections, Earth's plates move relative to one another. A plate may move away from another plate, or it may move toward it. Earthquakes often result from interactions between plates. Predict what other consequences might result from plate motion.


6. Of the several possible non-egg models of Earth, which do you feel is most appropriate? Why?

7. Of the several possible nonegg models of Earth, which do you feel is least appropriate? Why?

Samuel throws a ball into the air 20 meters. It reaches the top of its flight at 2
seconds and hits the ground at 4 seconds. What was the ball's average speed on the
way down?

riddle of the day

What is so fragile that saying its name breaks it?