Chemistry High School

please help need 18-20 answer ​

Please Help Need 18-20 Answer

Answers

Answer 1

Answer:

800 ml

marbel

flow

Explanation:

Answer 2
18- So the equation for density is d=m/v. So if we take the volume of 500ml + 300ml we get a volume of 800ml and a mass of 400g. So we use the equation d=400g/800ml. This gives us a density of 1g/2ml.

19- if we have a ring with a mass of 107g and a volume of 5ml. We will use the following formula d=m/v so this ends up as 21.4=107g/5ml this gives us the material Platinum

Related Questions

Identify the reaction
In photo

Answers

Answer:

single displacement

Explanation:

6. Which change to a population would cause
increased competition among
its members?
SC.7.L.17.3
ES
an increase in population size
B a decrease in population size
© an increase in predation on the
population
D an increase of disease in the population

Answers

Answer:

B

Explanation:

Because I said so

Standard temperature and pressure are

A. 0°C and 1.00 kPa
B. 0°C and 101.3 kPa
C. 273°C and 1.00 kPa
D. 273°C and 101.3 kPa

Answers

Answer:

D

Explanation:

basic forces.
Gravity is one of

Answers

Answer:

Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay.

Fundamental force that’s the answer

Hey I'm Chloe, Can you Help me Thank you :)
Q: how can you tell if two objects are in thermal equilibrium?

Answers

Answer:

Two objects are in thermal equilibrium if they are in close contact that allows either to gain energy from the other, but nevertheless, no net energy is transferred between them. Even when not in contact, they are in thermal equilibrium if, when they are placed in contact, no net energy is transferred between them.

Explanation:

hope this helps chloe

If an atom of Oxygen (8 protons, 8 neutrons, and 8 electrons) gains two electrons, what is the charge of the ion formed?

Answers

Answer:

It becomes negative

Explanation:

protons carry a positive charge

neutrons carry a neutral charge

electrons carry a negative charge

if we add 2 more electrons, the charge of the ion becomes negative

thank you.

A new element, Thorsonium, has two isotopes. Thorsonium isotopes have a mass of 255 amu and 257 amu. Given the average atomic mass of Thorsonium is 255.65 amu, calculate the percent abundance for each Thorsonium isotope.

Answers

Answer:

255 amu has relative abundance 67.5% and 257 has relative abundance 32.5%

Explanation:

Average atomic mass =sum of product of atomic mass and relative abundance all divided by hundred or total abundance

When having an equal number of protons and electrons, what does that do to the overall charge of the element? Why do you think that?

Answers

It means it’s neutrally charged! Protons are positive while electrons are negative, so they balance each other out. Neutrons are neutral so they don’t weigh in.

What is the mass of an atom of krypton? explain

Answers

Answer:

Krypton. Atomic Mass. 83.80u. Electron Configuration. [Ar]4s23d104p6.

Atomic Mass: 83.80u

Electron Configuration: 4s23d104p6

Year Discovered: 1898

Describe how the calcium atom and the oxygen atop form calcium oxide

Answers

Explanation: Formula and structure: Calcium oxide chemical formula is CaO and its molar mass in 56.0774 g mol-1. The molecule is formed by the calcium cation Ca+2 and the oxygen anion O-2, which form a ionic bond. The calcium oxide ionic lattice is cubic and similar to NaCl lattice, with an ion surrounded by 6 opposite charge-ion.

Which oxide is used to make red colour glass?​

Answers

Answer:

Selenium

Explanation:

Select the correct answer.

What is the chemical formula of calcium chloride?

A.
CaCl
B.
Ca2Cl2
C.
Ca2Cl
D.
CaCl2

Answers

Answer:

D.CaCl2

Explanation:

Answer:

ans is D because the velency of calcium is 2 and clorine is 1 if we do cross multyply then it is option d

Which descriptions offer examples of Correction Services workers? Select all that apply.

Jadee guards a company’s office building to prevent crime.
Doug supervises Jailers and makes sure their work meets standards.
Cortez maintains order in courts of law.
Midori investigates crimes and arrests crime suspects.
Rudy monitors people who are on probation and parole.
Nancy guards inmates in a prison.

Answers

Answer:

its B, E, F

Explanation:

on edge 2021

Answer:

2. Doug supervises Jailers and makes sure their work meets standards.

5. Rudy monitors people who are on probation and parole.

6. Nancy guards inmates in a prison.

Select the correct answer.

Which products are formed during the decomposition of magnesium nitride (Mg3N2)?

A.
Mg + 3N2
B.
3Mg + 2N2
C.
Mg + 3N
D.
3Mg + N2
E.
2Mg + 3N

Answers

Answer:

D. 3Mg + N2

Explanation:

magnesium nitride will decompose to form elemental magnesium and nitrogen gas

Mg₃N₂  → Mg + N₂

The reaction now needs to be balanced So that the number of Mg and N atoms in the reactants is equal to that of the products

Help me which is it

Answers

You picked the correct answer. Its amorphous solid. Good luck on the rest!

Similes and metaphors are poetic devices. What does this
mean?

Answers

Answer:

Both similes and metaphors are a poetic device because authors can be seen using them while writing their poem to give the reader a deeper understanding of the character and the setting. Metaphor is a figure of speech that talks about one this but refers to another. On the other hand, a simile is a figure of speech that compares two things together. Usually using the work "like" or "as".

Hoped it helped! Have a great day!

Volcanic eruptions cannot be predicted by scientists.
true or false​

Answers

Answer:

false

Explanation:

Explain how Newton's idea about inertia has helped in astronomy?
o We can learn that objects in space like asteroid will keep its path unless a different force is applied to it
The Law of Inertia will help us discover distant galaxies
Inertia is used to help identify distance planets.
o We can figure out the size of far away planet through the Law of Inertia.
NEXT QUESTION
ASK FOR HELP

Answers

Answer:

the answer is  A  because  when something is going straight  it wont change unless its acted  upon by a force

Explanation:

Until the 1500s, doctors thought
diseases were caused spontaneously. Scientists
began proposing that diseases were caused by
seed-like entities that could be passed among
people. After the invention of the microscope,
doctors came to know that many diseases were
actually caused by microscopic living organisms
like bacteria. What does this suggest about the
nature of scientific knowledge?-

Answers

Answer:

D

Explanation:

The charge of a single proton is 1.60 × 10–19 C. What is the nuclear charge of an atom of boron (B)?

Answers

Answer:

[tex]q=8\times 10^{-19}\ C[/tex]

Explanation:

Given that,

The charge of a single proton is [tex]1.6\times 10^{-19}\ C[/tex]

There are 5 protons in the nucleus. The nuclear charge of an atom of boron is given by :

[tex]q=5\times 1.6\times 10^{-19}\\\\q=8\times 10^{-19}\ C[/tex]

So, the required charge is [tex]8\times 10^{-19}\ C[/tex].

type the correct answer in each box balance the equation

Answers

Answer:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

Explanation:

This question involves balancing the above equation. An equation is said to be BALANCED when all the atoms of each element in the reactant side equates that in the product side.

According to this question, a chemical reaction is given as follows: SiO2 + CaC2 = Si + CaO + CO2. Based on observation, the atoms of elements are Silicon, oxygen, calcium and carbon are not the same on the reactants and products side. Based on this, the balanced equation is:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

A molecule is

A a group of atoms bonded by ionic bonds.
B a group of atoms bonded by covalent bonds.
C a group of ions bonded by covalent bonds.
D a group of atoms bonded by metallic bonds.

Answers

Answer:

B.

Explanation:

Atoms make up molecules and ionic bonds cannot make up a molecule because they do not share electrons like in a covalent bond.

Explain the difference between ionic and covalent bonding using the following term(s)

A. Electronegativities

B. Types of atoms bonding

Answers

Answer:

R we gonna say what letter if were gonna say it its A

Explanation:

SBc Its Our Lesson Today In Science

how does neutralization reaction help in the remedy of our digestion disorder? clarify​

Answers

Answer:60

Explanation:

60 is 60 is 69 to the l the b i like eating j wek;gnl

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I NEED HELP PLZ HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEE I REALLY NEDDDDDDDDDDDDDDDDDDDDDDDDDD HELP PLZZZZZZZZZZZZZZZZZZZZZ HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ

Answers

Answer:

a

Explanation:

What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?

Answers

Answer:

The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.

How much total heat is required to bring 25.0g of ice at ~2.00 C to a liquid at 50.0 C? Please

Answers

Answer:

q=m*c*•

Explanation:

•=50-2

m=25

c=4.18

q=?

use this

Do the chemical formulas NO, NO2 and N2O provide the same information in all aspects? Explain.​

Answers

Answer:

yes they do because is it quite into te aspects of ciencia

Which of the following is one principle of the cell theory?
(1 Point)
A. Animals are the only living things made of cells.
B. Plants are the only living things made of cells.
C. All living things are made up of one or more cells.

Answers

Answer:

One principle of the cell theory is that living things are made up of one or more cells.

Explanation:

The answer you are looking for is C
Both plants and animals are made of cells
And all living things are made up of one or more cells. I hope that helped! :)

Can you please help me?

Answers

Answer:

ammonia 11

HCL. 2

sodium hydroxide 12

NAcl =7

ethanoic acid =3

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