Help please?? I’m confused

Answers

Answer 1

It’s c. O stands for oxygen and h stands for hydrogen. They both do play in the roll

Related Questions

PLEASE HURRY

Animals respond to external stimuli, such as light, temperature, and danger. Explain what body system is utilized when animals go into fight or flight mode

Answers

Sympathetic nervous system is the fight or flight system which gets the body ready and aroused for action and the parasympathetic nervous system reverses that state

Which of the following is different in two isotopes of the same element?
the number of atoms
the number of electrons
the number of neutrons
the number of protons

Answers

Answer:

Different number of neutrons

Explanation:

Isotopes are different versions of an element, in which the only difference is that they have different numbers of neutrons in the nucleus, and therefore slightly different atomic masses.

B. Argue: Your classmate predicted the magnets are
going to repel because negative and positive charges
repel each other.
Explain why you agree or disagree. (I agree because
or I disagree because
I

Answers

Answer

they atract

Explanation:

help please , i’ll give u extra points

Answers

Answer:

I think c

Explanation:

cuz it says it's only friction to the left and actual force to the right

i’m pretty sure it’s c

Which element has 47 protons?silver

Answers

Answer:

The answer is Silver

Numbers of Protons in Silver: The element Silver (Symbol Ag) has the Atomic Number of 47. Any atom that contains exactly 47 protons in its nucleus is an atom of silver.

Hope this Helps!

_____ are the deepest parts of the ocean floor.
A. Seamounts
B. Trenches
C. Mid-ocean ridges
D. Abyssal plains

Answers

Answer:

Explanation:

im trying i dont actuly know

The ocean floors are the seafloor or the ocean bottoms are called seabeds. The deepest part of the ocean floor is called trenches. Thus, option B is correct.

What is the classification of ocean floors?

The ocean floors are said to be the seabeds that comprise of plains, mountains, and canyons, and are termed submarine relief. It ranges from the continental shelf, slope, rise, abyssal plain, ridges, and trenches.

The continental shelf is the first part and is at the least depth of the ocean floors, while the trenches are present at the greatest depth of the seabeds.

The trenches are the deepest part where the sunlight can not penetrate and ranges from 8000 meters and beyond. They are formed due to tectonic plate activity.

Therefore, option B. the trenches are the deepest part of the ocean beds.

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A compound that contains only carbon and hydrogen that produces carbon dioxide and water when burned is called?

Answers

a binary compound

Sorry that I dont have an explanation....its just something that needs memorized :)

Hope this helps! Please correct me if I'm wrong!

In which of the following scenarios is a chemical change taking place? *
3 points
Quartz crystal fractures when struck.
Sugar dissolves when poured into tea
Liquid water turns to a vapor at 100 degrees Celcius.
Sodium metal reacts with water to form sodium hydroxide and hydrogen gas.

Answers

Answer:

The answer to this would be D. Sodium metal reacts with water

The correct option is D. Sodium metal reacts with water to form sodium hydroxide and hydrogen gas.

What is a chemical reaction?

A chemical reaction leads to the transformation of a substance. The chemical bonds when bonds between reactants break and form a new chemical bond in products.

Quarts crystal fractures, when struck, is an example of physical change. Sugar dissolved when poured into tea is also a physical change. Liquid water turning to vapor at 100 degrees Celcius is an example of boiling.

When sodium metal reacts with water it will react with water and bonds between sodium and water reacts and will form sodium hydroxide and hydrogen gas.

Na(s) + H2O(aq) → NaOH(l)+ H2(g)

Therefore, The correct option is D. Sodium metal reacts with water to form sodium hydroxide and hydrogen gas.

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A carbon rod and a copper rod were hit alternately with a hammer. The carbon rod broke into pieces. Which property of carbon does this observation indicate?

Answers

Answer:

Brittleness

Explanation:

hope this helps u

Answer:

Carbon is a non metal

Explanation:

Non metals are brittle.

What is the overall net charge of an ionic compound?
O 1-
O 1+
O 2-
O 0

Answers

the charges should balance to 0

A student in class drops an element on the floor and it shatters quite easily. Which property does this best exemplify?

Answers

Answer:

Glass

Explanation:

Why do atoms with greater numbers of protons have greater electronegativity?

Answers

The positively charged protons in the nucleus attract the negatively charged electrons. As the number of protons in the nucleus increases, the electronegativity or attraction will increase. Therefore electronegativity increases from left to right in a row in the periodic table.

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carbohydrates are called bio fuels why ?

Answers

Answer:

There are so many carbohydrate which acts as bio fuel...Few of them glucose ,Cellulose ,starchtion:as bio fuel...Few of

Question 2 (1 point)
Given the following UNBALANCED equation,
Ca + HCl → CaCl2 + H2
what are the correct coefficients?
а
b
2,1,2,1
3,2,1,1
1,2,1,1
с
d
1,1,1,2
e
2,2,2,1

Answers

the correct coefficients are as follows (1,2,1,1)

List two adaptations the cave glow worm has for capturing prey in a cave

Answers

Answer:true

Explanation:

List two adaptations the cave glow worm has for capturing prey in a cave. droos a line of silk to trap palle - silk comes from glands in the mouth. a produces light to lure pret a insects are drawn towards light and get trapped in 3.

The bumpy pattern on the soles of shoes is called the tread. Melanie and Keisha are at the store looking at the treads on different basketball shoes. They want new shoes so that they do not slide on the basketball court. Which of these situations produces the most friction between the shoes and the floor?

Answers

A girl with greater mass wearing shoes with more tread?

Someone help me pls!

Answers

Answer:Warm ocean currents originate near the equator and move towards the poles or higher latitudes while cold currents originate near the poles or higher latitudes and move towards the tropics or lower latitude.

Explanation:

What phase change is the following substance undergoing?
First, the particles of this substance are closely packed and
are not easily compressed. After the change, the substance
can flow easily but cannot be easily compressed.
a freezing
b melting
Cevaporation
d deposition
e sublimation

Answers

Answer:

b melting

Explanation:

The phase change the substance is undergoing is from solid to liquid and this is called melting.

To understand this process, we need to know the the substance changing. A substance that contains particles that are not easily compressed and packed is a solid. Solids have fixed shapes and volumes. Liquids can easily flow although they cannot also be easily compressed.

The phase change from solid to liquid is facilitated by a melting process.

What property can be used to determine if a sample is a pure substance or a mixture?
Select one:

color

temperature

melting point

mass

Answers

Answer:

Melting point

Explanation:

Pure substances have sharp melting and boiling points while impurities lower the melting point and raise the boiling point

Bridget is in science class. Her teacher gives her two unknown substances and asks her to determine their relative pH. She places a piece of red litmus paper into both substances. The litmus paper turns purple when she places it into substance I. The litmus paper turns blue when she places it into substance II.

Which of the following is true about the relative pH of the two substances?
A.
Substance I is an acid and substance II is a base.
B.
Substance I is a neutral substance and substance II is a base.
C.
Substance I is a base and substance II is a neutral substance.
D.
Substance I is a neutral substance and substance II is an acid.

Answers

Answer:

Substance I is a neutral substance and substance II is a base.

whats the name of CaS?

Answers

Answer

Chemical formula or Chemical Abstracts Service

Explanation:

A CAS (Chemical Abstracts Service) Registry Number is a unique identifier that tells you, for example, that acetone and dimethyl ketone are actually the same substance.

If this is a chemical it is Calcium Sulfate

4 Al + 302 → 2Al2O3
If a chemist does the reaction and produces 3.5 moles of aluminum oxide, how many moles of O2 were used in the reaction?

Answers

The answer is 5.25 moles
The Stochiometric coefficient between o2 and Al2O3 is 3:2
You have 3.5 moles of aluminum oxide so you have a simple equation you can solve
3.5*3=2x

According to the stoichiometry and given chemical equation ,5.25 moles of oxygen are used in the reaction to produce 3.5 moles of aluminium oxide.

What is stoichiometry?

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given chemical equation, 3 mole of oxygen produces 2 moles of aluminium oxide.

Therefore for 3.5 moles of of aluminium oxide to be produced 3.5×3/2= 5.25 moles of oxygen are used.

Thus, 5.25 moles of oxygen were used in the reaction to produce 3.5 moles of aluminium oxide.

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List 2 reasons why metals are such great conductors.
PLEASE HELP THIS IS TIMED

Answers

Answer:

the atoms in the metals form a matrix through which outer electrons can move freely.

Explanation:

A flow of charged particles is an electric current. A metal has a built in supply of charged particles that can flow from one location to another- the pool of shared electrons.

what is the most abundant metal in the earth's crust ?

Answers

Answer:

aluminium

Explanation:

I think I'm not Rly sure

Answer:

Aluminium

Explanation:

Percent abundance of given elements in the earth's crust are :

Oxygen - 46.6%

Aluminium - 8.1%

calcium-3.63%

gold-0.0011%

But oxygen is a non-metal and aluminium, calcium and gold are metals.

Therefore, Aluminium is the most abundant metal in the earth's crust.

What do all cells requiere a constant supply of

Answers

To survive, every cell must have a constant supply of vital substances such as sugar, minerals, and oxygen, and dispose of waste products, all carried back and forth by the blood cells.

5 of 7 What percentage of a material will persist after 80 minutes if it's half life is 20 minutes?

Answers

Answer:

Explanation:

Which of these liquids are solutions? Check all that apply. water salt water soda orange juice coffee

Answers

Answer:

salt water, soda, orange juice, coffee

Explanation:

Answer: salt water, soda, orange juice, coffee

Explanation: On Edge!!!!!!!!

True or False, The crust is made up of different plates that can slowly move around?

Answers

Answer:

True

Explanation:

There is such thing called tectonic plated

Answer:

True

Explanation:

The crust is made of plates called tectonic plates that move as fast as your finger nails grow, the amount of movement can create both tall and deep earth wonders. Such as the Mariana Trench and Mount Everest. And it causes earthquakes when they slide together.

Pls mark brainliest

Have a nice day!

HELP I WILL GIVE BRAINLIEST

Answers

The atomic number is 13. The bottom number is your atomic mass

in the liquid state hydrogen is used as a fuel in

Answers

Answer:

Space Technology

Explanation:

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