i need halp with this one

Pangea was formed in the Paleozoic Era

what voltage is required to move 2a through 20ω

When drawing the Lewis structure of a molecule, start by determining the total number of available valence based on each element's ____________ Then, use the total number of electrons needed for each element to be stable, generally based on __________ to determine the _____________ by finding the difference between the number of needed and available electrons divided by two. Next, identify the central atom, which is the element with the ______________ other than hydrogen. Finally, arrange the number of bonds around the central atom to fulfill the stable number of electrons for each element.

The following table lists the speed of sound in various materials. Use this table to answer the question.

Substance Speed (m/s)
Glass 5,200
Aluminum 5,100
Iron 4,500
Copper 3,500
Salt water 1,530
Fresh water 1,500
Mercury 1,400
Hydrogen at 0°C 1,284
Ethyl Alcohol 1,125
Helium at 0°C 965
Air at 100°C 387
Air at 0°C 331
Oxygen at 0°C 316
Sound travels fastest in _____.

solids
liquids
cold gases
warm gases

Karl went to the doctor complaining of a sore throat. The doctor performed
a throat culture and determined that antibiotics were not necessary. The
doctor told her to drink tea, take ibuprofen, and rest. Which type of microorganism most likely caused Karl's sore throat?
a) bacteria
b) virus
c) parasite
d) fungi

Will give brainliest!!!!

15. The equation which gives the
relationship between the cell potential
and the concentrations of the cell
components is called -- (a) Nernst
equation (b) likovicequation (c) Voltaic
equation (d) none of the above​

Which item is necessary to make an electromagnet?

The chemical equation, 2 Cr + 3 Fe(NO3)2 - 3 Fe + 2 Cr(NO3)3, is an
example of which type of reaction?*

How should this combustion reaction be balanced?

C5Hg + 02 → C02 + H2O

A. C5Hg + 502 → 5C02 + H2O

B. C5H9 +3.502 → 5CO2 + 8H20

C. C5Hg + 702 → 5CO2 + 4H20

D. C5Hg + 302 → CO2 + 4H20

Find the molarity of a 8.9M KOH solution if 76 ml of solution is diluted to 171 ml?



3.96m

20.03M

0.25m

3.96M
Heeeellllppppp meeee pls​

Hydrochloric acid is a ———— ?
A. Strong electrolyte
B. Weak electrolyte
C. Non-electrolyte
D.
E. Molecular compound

Science**
5) Which statement best states the relationship between mass and
gravitational attraction between two objects? *

Which rock type(s) could be transformed into sediment?
a: sedimentary rock
b. igneous rock
c. both rock types
d. neither rock types

Dose Anabolic Reaction helps cells multiply and stay good condition
DO NOT JUST USE UP THE POINTS I WILL REPORT YOU
tell me if your from connexus please with your answer

What is a homologous structure that humans share with other vertebrates when they are fully grown?
hair
gills
spine
tail

is it good to use alcl on the icy roads?

What type of reaction is shown below?
A. hydration reaction
B.addition reaction​

1. Goose
2.frog
3. Turkey
4.earthworm

The reaction 2Mg(s) + O2(g) --> 2MgO(s) is a
Group of answer choices
double-replacement reaction.
decomposition reaction.
synthesis reaction.
single-replacement reaction.

give the symbols of the ions formed when sodium reacts with chlorine

Aside from direct harm, what secondary issue do invasive species present?

They may be able to eat all kinds of native organisms.

They may not have any predators.

They might damage the habitat that other organisms rely on.

They might introduce other organisms like viruses and bacteria.

If 0.25 moles of H2O are produced, then how many moles of oxygen gas were consumed?

1.
In the periodic table, all the elements in the same column have similar
and
properties.

What is uranium classified as

Akali Metals, Akaline Metals, Metalloids, Halogen, Noble Gas, Transition Metal, Rare Earth Metal or Non-Metal?

SOMEONE PLEASE HELP I NEED THIS NOW PLEASE JUST THIS ONE QUESTION I DON’T KNOW

Consider the following diagram of a chemical reaction.

A series of four increasingly more complex chemical structures. The first diagram shows that when heat is applied to R single bond O single bond O single bond R, it creates 2 R single bond O with 1 electron dot. The next structure brings in more complex structures and other atoms, such as H and C. This process continues until the final molecule has a long chain of six starting with R O and ending with C with a single electron dot. There are four single side chains, 3 P h and 1 H.
What is the product that is formed in this reaction?

a polymer
a monomer
an alkyl halide
a carboxylic acid

can somebody please help me ! :(

A solution of zinc nitrate is added to a solution of sodium carbonate.

The reaction 2KClO3(s) --> 2KCl(s) + 3O2(g) is a(n)
Group of answer choices
combustion reaction.
ionic reaction.
synthesis reaction.
decomposition reaction.

A sound wave has a frequency of 3250 Hz and a
wavelength of 0.1 m. What is its velocity? SHOW
YOUR WORK
help please!!

Calculate P[NO]eq, if P [NOCI]eq = 0.33 atm, P [C12]eq = 0.50 atm, and Kp = 1.9 x 10-2.
2 NOCI(g) = 2 NO(g) + C12(g)