Chemistry High School

Help pleasee I need help to write the formulas i’m so lost

Answers

Answer 1

Answer:

NH4

Explanation:

Related Questions

PLEASE HELPPP

A(n) _________is a
group of atom. joined by chemical bonds.

THIS IS SCIENCE NOT CHEMISTRY

Answers

Answer; molecule

Explanation:

Someone help me please i’ll give brainly

Answers

Answer:

Ionization

Melting

Vaporization

Explanation:

▶Ioniztion changes the charge of an electron, this usually happens between a chemical reaction. It takes a small amount of energy. Most of the time energy is absorbed instead of expelled!

▶ Melting changes the shape of the item and takes about 334 Joules/gram of energy.

▶ Vaporization changes the state of matter that the item is in and requires 2260 Joules/gram.

Brainliest is much appreciated! Hope I helped!

6. There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. What does this say about the relative abundances of the three isotopes?

Answers

Answer:

That means that the isotope that has a mass number of 28 is probably the most abundant. This is because your average atomic mass is 28.086 amu, which is closest to 28.

Formula used to calculate average atomic mass follows:

average atomic mass=(atomic mass of an isotope)*(fractional abundance)

we are given=

Three isotopes of Silicon, which are Si-28, Si-29 and Si-30.

Average atomic mass of silicon = 28.086 amu

As, the average atomic mass of silicon is closer to the mass of Si-28 isotope. This means that the relative abundance of this isotope is the highest as compared to the other two isotopes.

Percentage abundance of Si-28 isotope = 92.2%

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1%

Hence, the abundance of Si-28 isotope is the highest as compared to the other isotopes.

7
Select the correct answer.
Which quantity is a graduated cylinder designed for measuring?
O A. length
ОВ.
mass
O C. temperature
D.
time
O E. volume

Answers

Answer: Volume im pretty sure

E. Volume is the answer

What were some dangers associated with early ballon flights?

Answers

Explanation:

The dangers of ballooning were apparent to aeronauts and the general public. From the early 1800s, attempts to fly over water too often ended in disaster or a narrow escape. Some of the best known aeronauts on both sides of the Atlantic set off across a large body of water never to be seen again.

Which option is an Ionic Compound
A.LiCl
B.CO
C.No2
D.So3

Answers

Answer:

LiCI

Explanation:

CO and No2 are both covalent compounds and it was a 50 50 and I guessed the right answer.

The one that is an ionic compound is LiCl. The correct option is A.

What are ionic compounds?

Ionic compounds are those compounds that have one negative and one positive charge molecule. When this negative and positive charge joins together, the compound becomes neutral. Electrostatic force joins these elements.

LiCl is a salt that is formed by the joining of lithium with chloride. Lithium is positively charged and chlorine is negatively charged. One identity of this compound is that it is a neutral salt, so it can be identified as an ionic compound. When they disjoint, they form a crystal-like structure.

An example of an ionic compound is sodium chloride, in which sodium is positive and chloride is negative.

Therefore, the correct option is A. LiCl.

To learn more about ionic compounds, refer to the link:

https://brainly.com/question/9167977

#SPJ2

Question 4
Which best describes a chemical reaction that follows the law of conservation of matter?
А
The reactants have the same mass as the products.
B
The reactants have the same density as the products.
С
The products conserve all physical properties of the reactants.
D
The products conserve all chemical properties of the reactants.

Answers

It is going to be D hope this helps

How you find a unknown element (just with the atomic emission spectrum)

Answers

Each natural element has a characteristic light spectrum that helps identify it in samples of unknown substances. Spectroscopy is the practice of examining spectra and comparing them to those of known elements. Using spectroscopy methods, scientists can identify pure substances or compounds and the elements in them.

What kind of molecule can experience hydrogen bonding?
A. A nonpolar molecule containing a hydrogen atom
B. A molecule with hydrogen bonded to any nonmetal
C. A molecule with hydrogen bonded to O, N, or F
D. Any polar molecule containing a hydrogen atom

Answers

Answer:

Answer is C

Explanation:

C - A molecule with hydrogen bonded to O, N, or F

A molecule with hydrogen bonded to O, N, or F can experience hydrogen bonding. Therefore, the correct option is option C.

A hydrogen atom is attracted to another electronegative atom in a neighbouring molecule when it is connected to a strongly electronegative atom (O, N, or F). This attraction is more powerful than the usual dipole-dipole interactions between polar molecules.

The enormous electronegativity differential between hydrogen and the highly electronegative atom causes hydrogen bonding. The electronegative atom attracts the shared electrons in the covalent link, causing the hydrogen atom to gain a partial positive charge.

To know more about hydrogen bonding, here:

https://brainly.com/question/31139478

#SPJ4

Fill in the coefficients that will balance the following reaction:

PbI4 +
CrCl3 →
PbCl4 +
CrI3

Answers

the equation balanced is

3 PbI4 + 4 CrCl3 → 3 PbCl4 + 4 CrI3

Answer:

3,4,3,4

Thank me later!

Explanation:

_________feedback is a type of feedback in which a system is triggered to produce an output.

Answers

Answer:

positive

Explanation:

Answer:

Positive feedback is a type of feedback in which a system is triggered to produce an output.

Explanation:

Have a great rest of your day
#TheWizzer

What is the overall charge of the compound, NaF?

+2

-2

-1

0

Answers

Answer: -1

Explanation: It is neutral because the Na and F atoms are transferring their valence electrons in order to become stable. This results in an overall stable atom. If we were to identify the individual charges of verbalized atoms, Na would have a positive charge, and F a negative charge - both of 1.

It's not -1.

the answer is (0), hope this helped

can someone help me with this

Answers

Location A. 0.7g/mL will have a lesser density compared to the other ones, meaning the object will float instead of sink. If the density is higher, like 0.9, then the object will sink until it hit location B, then it would start to float again.

The theory of plate tectonics was, at first, rejected by most scientists. Now most geologists accept that tectonic plates exist and that these tectonic plates can and do move. What is responsible for the change in how scientists think about plate tectonics?

Answers

Answer:

The validation of seafloor spreading in the 1950s and 60s

Explanation:

The theory of seafloor spreading was supported by numerous evidence including thermal probes that showed that heat flow over the mid-ocean ridges measured up to four times those measured in general bottom sediments, which are taken as due to the presence of molten Earth material close to the ridge crest

The ridge crest also show signs unusually seismic wave velocities that are considered to be due to microfracturing and thermal expansion from upwelling magma

Hi can someone help me answer this!

Answers

the answer to this question is B.

how many moles of sulphur are in 53.7 grams of sulphur

Answers

Answer:

1.67 mol S

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic TableUsing Dimensional Analysis

Explanation:

Step 1: Define

53.7 g S

Step 2: Define Conversions

Molar Mass of S - 32.07 g/mol

Step 3: Convert

[tex]53.7 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S} )[/tex] = 1.67466 mol S

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

1.67466 mol S ≈ 1.67 mol S

Which of the following structures are found in eukaryotes, but not prokaryotes?
A) Cytosol

B) Cilia

C) Golgi body

Answers

Answer:

Explanation:

is silver tarnishing a physical change or a chemical change?

Answers

Answer:

chemical

Explanation:

Some bronze objects tarnish to a dark brown color. Chemical properties can be identified by the changes they produce. The change of one substance into another substance is called a A piece of wood burning, an iron fence rusting, and a silver spoon tarnishing are all examples of chemical changes.

Which of the following is an example of Newton’s 2nd Law? A. A bowling ball requires more force to roll than a tennis ball B. Sitting in a chair C. A rocket blasting off D. All of the above

Answers

Answer:

The answer is A.

Explanation:

A teacher showed this animal to students on a field trip which tool will allow the students to best see the animal up close

Answers

Answer:

Magnify glass

True or false. (Pls help)

Answers

I believe they’re both true.

Answer:

1.) False?

2.) true. sorry english not my first language

Calculate the gravitational force between two objects when they are 0.75m apart each object has a mass of 5.00kg

Answers

Answer:

0.000000000666863

Explanation:

F = GMm/R²

Compounds are combinations of elements. The combination of those elements is specific to the compound. Some compounds have the exact same elements but in different amounts. Look at C6H12O6, which you hopefully recognize as glucose (think cellular respiration and photosynthesis. But ribose is a 5 carbon sugar and its formula is C5H10O5, which you hopefully recognize (think RNA). They both have the same elements, but have different numbers of each element (sugars all have the 1:2:1 ratio). When you're looking at a formula, it's wise to look for the capital letters. That indicates when a different element is present. For glucose, there's a capital C - carbon, a capital H - hydrogen, and a capital O - oxygen. Behind elements, the subscripts help indicate the number of each element that's present. In glucose, there are 6 carbons, 12 hydrogens, and 6 oxygens. How many carbons, hydrogens, and oxygens does ribose have in its formula?

Question 4 options:

5, 12, 5

1, 2, 1

5, 10, 5

6, 12, 6

Answers

Explanation:

Omg How Am I supposed to get the answer tell me what to do

is this correct? and can you tell me yes or no for each one thanks

Answers

Answer: Yes it's correct.

Explanation: i hoped that helped!!

Answer:

yes this is correctly done

What types of elements- metals,
nonmetals, or metalloids require
the most energy to remove an
electron?
Why do these elements have a higher ionization energy?

Answers

Answer:

Noble gases

Explanation:

The noble gases are non-metals that requires the highest amount of energy to remove an electron from their shells.

The reason for this difficult is that their electronic configuration confers a stable configuration them.

The ionization energy is the energy required to remove the most loosely held electrons in an atom. Due to the special stability of noble gases, it is very difficult to remove electrons from an atom of noble gases.

why chemical reactions are important to society?

Answers

Chemical reactions are how new forms of matter are made. While nuclear reactions also may produce new matter, nearly all the substances you encounter in daily life are the result of chemical changes. Chemical reactions help us understand the properties of matter.

Got it from google lol

What type of reaction would NI3+ ->lead to?

Answers

Answer:

Reduction potential (Eo) is defined as a tendency of a chemical species to be reduced by gaining an electron and is defined with electrochemical reference of hydrogen, which is globally given the reduction potential of zero [24].

Explanation:

Which ion has smaller size and why?Mg++ or Na+.

Answers

Answer:

Explain your answer. mg2+ would be the smaller ion this is because each ion has the same number of electrons however mg2+ has a greater number of protons and therefore is more charge dense and the outer electrons feel a greater pull from the nucleus.

Hope this helps, have a great day/night, and stay safe!

What does it mean when a compound is 'soluble in water?
A. It does not dissolve in water.
OB. It dissolves in water.
O C. It forms a precipitate in water.
O D. It has water molecules attached to it.

Answers

B. It dissolves in water.

<33

Answer:

B it dissolves in water

Explanation:

Their molecules bond to water molecules

Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?

selective breeding
cloning
artificial selection
gene therapy

Answers

artificial selection

Answer:

Hi, the answer is C. Artificial Selection

I know this becasue I just finished my test

Explanation:

Other Questions

-Name the two neighbouring countries in the north east and two in the northwest of India Can someone help me please A scuba diver used the expression below to describe his position in relation to sea level.2 + (negative 20) + 8Which statement could describe the divers movements?Starting on a platform 2 feet above sea level, dive down to a location that is 18 feet below sea level, and then rise 8 feet.Starting on a platform 2 feet above sea level, dive down to a location that is 20 feet below sea level, and then rise 8 feet.Starting 2 feet below sea level, dive down 20 more feet, and then rise to a location that is 8 feet below sea level.Starting 2 feet below sea level, dive down 18 more feet, and then rise to a location that is 8 feet below sea level. Any help is needed!! only if you know ofc! Frank earns $8 per hour. Madison earns $7.50 per hour. Frank started working after Madison had already earned $300. If these rates continue, will Franks earnings ever equal Madisons earnings? If so, when? Image courtesy of NASA and the CIA World FactbookThe map above shows the countries of the Middle East. Which country is highlighted?A. TurkeyB. IsraelC. AfghanistanD. Iran Does anyone know this? Which fraction is less than 1/2?A. 3/8B. 5/8C. 5/7D. 9/16 Explain in your own words what Mercantilism is. how do you solve for x when you have this problem below please explain !! What was a result of Louisianas settlers becoming more confident in their ability to survive? The territory expanded. The settlers moved to other regions. France sent additional supplies. The colonies negotiated trade with Louisiana. Assume you have a 1-year investment horizon and are trying to choose among three bonds. All have the same degree of default risk and mature in 10 years. The first is a zero-coupon bond that pays $1,000 at maturity. The second has an 6.2% coupon rate and pays the $62 coupon once per year. The third has a 7.2% coupon rate and pays the $72 coupon once per year.a. If all three bonds are now priced to yield 7% to maturity, what are their prices?b. If you expect their yields to maturity to be 7% at the beginning of next year, what will their prices be then? What is your before-tax holding-period return on each bond? If your tax bracket is 30% on ordinary income and 20% on capital gains income, what will your aftertax rate of return be on each?c. If you expect their yields to maturity to be 6% at the beginning of next year, what will their prices be then? What is your before-tax holding-period return on each bond? If your tax bracket is 30% on ordinary income and 20% on capital gains income, what will your aftertax rate of return be on each? In a solution, what term is given to the liquid? Once, when a Lion was asleep, a little Mouse began running up and down upon him. This soon wakened the Lion, who placed his huge paw upon him, and opened his big jaws to swallow him. Pardon, O King, cried the little Mouse, forgive me this time, I shall never forget it! I may be able to return the favor one of these day? The Lionwas so tickled at the idea of the Mouse being able to help him that he lifted up his paw and let him go. Some time after, the Lion was caught in a trap, and the hunters, who desired to carry him alive to the King, tied him to a tree while they went in search of a wagon to carry him on. Just then the little Mouse happened to pass by, and seeing the sad plight of the Lion, went up to him and soon gnawed away the ropes that bound the King of the Beasts. Was I not right? said the little Mouse. how did the Spanish conquest is Hernan Cortes defeat the Aztec empire? plsss helpppp Health hazards and safety hazards from welding, cutting, and brazing operations include all of the following except:Exposure to metal fumesExposure to gamma radiationExposure to ultraviolet radiationExposure to extreme heat A number divided by 42 has a quotient of 28 with a remainder of 4. What is the number?O 1,064o 1,172O 1,176O 1,180 Read the excerpt from Chapter 28 of Moby-D l c k. Nor a word he spoke; nor did his officers say aught to him; though by all their minutest gestures and expressions, they plainly showed the uneasy, if not painful, the consciousness of being under a troubled master-eye. Which best describes the theme Melville develops in this excerpt? the effectiveness of a leader who sets himself apart from others the importance of obeying a leader under all circumstances the inherent danger of a leader who exhibits signs of madness the problems associated with inexperienced leaders Which of the following contains all the rock, soll, lava and magma found onEarthA) GeosphereB) AtmosphereC) Hydrosphere The crab cakes were not only delicious, but the crab cakes were also inexpensive.O delicious and not only inexpensiveO neither delicious nor were they expensiveO not only delicious but also inexpensiveo not only delicious, but neither were they inexpensiveO No improvement or correction is required.