Chemistry High School

I need help with the questions in the picture. Please show workings.​

I Need Help With The Questions In The Picture. Please Show Workings.

Answers

Answer 1

Explanation:

you need to review these formulas

I Need Help With The Questions In The Picture. Please Show Workings.

Related Questions

In your own words, describe the process of convection.

Answers

Answer:

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat

Explanation:

<3

Answer:

Convection when heat travels through metal or appliances.

Explanation:

The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for a mass of 62.93 amu and 30.8% for a mass of 64.93amu. Calculate the average atomic mass of copper.

Answers

Answer:

63.546

Explanation:

The Average atomic mass is calculated using the formula:

sum of the product of the atomic masses and their relative abundances all divided by 100 or total abundance

Bread is made with which fungus?

morel
yeast
mold
chytrid

Answers

Answer:

yeast

Explanation:

sorry if incorrect

The answer is Yeast!!

Why does everyone keep saying I should call Uraraka “red cheeks” instead of “pink cheeks” (=_=)

Answers

Make her cheeks red

i dont know man they're weird

what is 15 /2.343*233+2341















if you are reading this you like the person you are sitting beside or just beside or will sit beside next.

Answers

no one is sitting by me

Answer:

3832.67

Explanation:

Which statement correctly compares the sun and planets? A. Planets have an atmosphere; the sun does not. B. Planets gives off energy; the sun does not. C. Planets orbit the sun; the sun is at the center of the solar system. D. Planets are all made of solid materials; the sun is made of gases.

Answers

Answer:

c

Explanation:

because the sun is at the center of the universe the planet orbit the sun its basically a simple answer so if you need more help im right here

The sun and the planets are part of the solar system. The sun is in the center of the system, and the planets revolve around it. Thus, option C is correct.

What is the solar system?

A solar system is a part of the Milky Way galaxy that includes the planets, stars, sun, moon, asteroids, etc. The Sun is the star that is fixed at the center of the system.

The planets are not fixed and revolve in orbit around the sun and rotate on their axis. The sun and planets are made up of gases and have different atmospheres.

Therefore, option C. sun is at the center around which the planets revolve.

Learn more about the sun and planets here:

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Which of the following pairs of elements is most likely to form an ionic bond?
A.
nitrogen and oxygen
B.
lithium and chlorine
C.
phosphorus and chlorine
D.
selenium and bromine

Answers

Answer:

B.

lithium and chlorine

Explanation:

Ionic bonds are typically formed between a metal and nonmetal. Lithium is an alkali metal in group one and chlorine is a halogen from group seven. They will bond to form the salt, lithium chloride.

When a logger cuts down a
tree, what type of change is
happening to the tree?
A. Physical change
B. Chemical change
'C. Mixture change

Answers

Answer:

A

Explanation:

Answer:

A

Explanation:

The original chemical structure of the tree is not changing, therefore it is not a chemical change, and it is definetely not a mixture change, its a physical change.

Dylan puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

Answers

If the magnetic toy trains are opposite charges, they will attract each other and collide however if the trains are of the same charge, they will oppose each other. This is because electrostatic force (the opposite forces so + and -) attract opposite charges

Hope that helps :)

Which of these can be used as an inert electrode?
copper
platinum
silver
zinc

Answers

Answer:

I believe it is platinum

Explanation:

I think it is, haha

Answer:

zinc

Explanation:

kwkejnrkewnrkwe

(science)
hurry help!!

All commonly abused drugs are illegal.

true or false

Answers

Answer:

False

Explanation:

Many abused drugs are prescription drugs.

False a lot of abused drugs are prescription

Which of the following is a standardized and convenient unit to use for comparing distances across the Solar System?
A
the distance from the Sun to Earth
B. the distance light travels in one year
C the distance Mercury travels in one year
D. the distance Earth travels around the Sun

Answers

C - the distance Mercury travels in one year
C. i’m pretty sure
hope this helped

What is the volume of 55 grams of carbon dioxide at STP

A. 2.45 L
B. 28 L
C. 1.25 L
D. 12.5L

Answers

Answer:

A. 2.45 L - Answer my answers is right.

What is a endothermic reaction

Answers

Answer:

Basically, it's heat transfer!

Good luck!

Answer:

An endothermic process is any process with an increase in the enthalpy H of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.

Explanation:

1. Make a prediction - Do you think water molecules speed up or slow down
when they are heated? *

Answers

Answer:

disminuyne

Explanation:

Need help fast plzzz!!! Please help.

Answers

Answer:

1. 0.5333333m (Calculator Soup Work Calculator)

2.

9. 29.1666666667% efficient

10. 44.5% efficient

Explanation:

will do other answers later

What are the characteristics of the three states of matter?
Solid:
Liquid:
Gas:

Answers

Solids: Have a shape that is indefinite

Liquids: Don’t have a fixed shape so they take the shape of anything they are contained in

Gas: they are made/composed of loosely packed particles

I don’t think this helped but just some notes I hav e
Solid: shape or volume, it doesn’t take the shape of the container
Liquid: definite volume, indefinite shape
Gas: easy to compress, expand to fill containers, occupy more space than liquids or solids.

You’re welcome :)!

What is a function of the backbone in animals

Answers

Answer:

The major function of the vertebral column is protection of the spinal cord; it also provides stiffening for the body and attachment for the pectoral and pelvic girdles and many muscles. In humans an additional function is to transmit body weight in walking and standing.

Explanation:

MARK ME BRAINLIEST :)

What is a unwanted change in the environment caused by substances or from of energy??

Answers

Answer:

pollution I think

Explanation:

Vectors are arrows that tell us two things about force...WEIGHT and DIRECTION

True
False

Answers

false, from what i know vectors tell us about direction and magnitude. not weight and direction
It’s false because vectors doesn’t tell us two things about force weight and direction

Calculate the ratio of H+ ions to OH– ions at a pH = 6. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide. Then divide the H+ concentration by the OH– concentration. Record this calculated ratio in Table A of your Student Guide. Compare your approximated and calculated ratios of H+ ions to OH– ions at a pH = 6. Are they the same? Why or why not? Record your explanation in Table A. What is the concentration of H+ ions at a pH = 6? mol/L What is the concentration of OH– ions at a pH = 6? mol/L What is the ratio of H+ ions to OH– ions at a pH = 6?

Answers

Answer:

Answer:

You must know the concept of pH of a solution and its relation to the concentration of H+ and OH- ions. pH is a measure of the substance's acidity or basicity. From the definition of Arrhenius, an acid contains an H+ while a base contains a OH- ion. From this definition, we can say that an acidic substance has a higher concentration of H+ ions. Now, I'll introduce here that pH is the value of the negative logarithm of the concentration of H+. In equation,

pH = -log[H+]

The term pOH is therefore also, pOH = -log[OH-]. Therefore, the relationship that connects the two negative logarithms is:

pH + pOH = 14

The pH scale starts from 1 being the most acidic to 14 being the most basic. The neutral pH is 7. Thus, for a pH of 7, the H+ and the OH- concentrations are equal.

pH = 7 = -log[H+]

[H+] = 1×10⁻⁷ mol/L = [OH-]

Since the concentrations are equal, the ratio is equal to 1.

huryyyyyy plsssssssssssssssssss

Answers

Answer:

B.

Explanation:

bc it goes from having the potential to move to moving sorry if im wrong tho

The correct coefficients needed to balance the following reaction are:
___ PbI2 + ___ ZnS → ___ PbS + ___ZnI2
a) 1, 2, 2, 1
b) 1, 1, 1, 1
c) 1, 1, 2, 2
d) 2, 1, 1, 2

Answers

I think the correct answer is c if not it’s d

Isotopes are atoms of the same element that have different O principal chemical properties, masses. O numbers of protons, O numbers of electrons.​

Answers

Answer:

Different atomic mass, number of neutrons

Explanation:

Isotopes refer to atoms of the same element, with same atomic number, number of protons & electrons. However, they have different atomic mass, because of different number of neutrons.

A book that slides off a desk will fall to the floor. What is it the moves the book and all other objects, downward?

Group of answer choices

Friction with other objects

Air pressure pushing from above

The force of gravity

Earth's magnetic fields

Answers

Answer:

Answer down below!

Explanation:

It would be the force of gravity, because gravity pulls all things toward the center of the Earth. If the book would have fallen down, the force of gravity was put in place.

Answer: The force of gravity

Explanation:

gravity is a force the brings thins towards the core, aka the ground

Do you think this one experiment is enough to change the scientific theory regarding the speed of light?

Answers

No. The speed of light does change. You mean speed of light in a vacuum. Measuring that value is elementary, in a 2-way measurement, as you show.

Can you please help me !!

Answers

Answer:

Explanation:

A)  O2 (non polar covalent)

B)  HF  (polar covalent)

C) NaCl (because its ionic)

im not 100% sure hope it helps

Which of the following are examples of a physical property of matter? Select all that apply.

Answers

The matter is made up of various types of particles which have a physical state and have inertia.

What are the physical property of matter? Select all that apply.

1. Matter is colour less. (false)

2. Matter is hard in structure. (true)

3. Matter is soluble. (true)

4. Matter can not conduct electricity. (false)

5. Matter has boiling point but not melting point. (false)

6. Matter has both boiling and melting point. (true)

7. Matter has not the density. (false)

8. Matter has the malleability. (true)

Matter is made up of different kinds of particles which can occupy space and they have some mass. All the matters are made up of the elements. The elements contain specific physical and chemical properties. the matter can not be broken by any ordinary chemical reaction.

So we can conclude that the matter is made up of various types of particles which have a physical state and have inertia.

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Hydrogen is the first element on
the periodic table. How many
protons does it have?
A. one
B. 118
C. it varies

Answers

it has one proton hope this helps

True or False vacuoles direct cell activities by sending instructions to different parts of an animal cell

Answers

Answer:

False

Explanation:

The nucleus controls the cells activities

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