Chemistry High School

I need help in this questions

Answers

Answer 1

Answer:

just use calculator mannn

Answer 2

The correct answer is H

Related Questions

Wind patterns are impacted by which of the following?

Choose ALL that apply

lesson 2.09

Question 7 options:

As a result, air near the equator heats up and rises because it is less dense.

The sun's energy heats air at the equator more than it does at the poles.

Radiant energy from the sun strikes Earth unevenly.

As it rises, it cools and begins to flow toward the poles. As this air leaves the equator, cooler and heavier air from the poles flows along the surface to take its place.

Answers

i’m pretty sure it all of them!

ALL options above described can impact the wind patterns.

Wind patterns are completely dependent on the amount of heat present in the environment, which is influenced by sun rays.

The sun rays are perpendicular near the Equator, thereby increasing the temperature of the air and changing win patterns.

As air rises, it cools and travels to higher latitudes (i.e. toward the poles).

In conclusion, ALL options above described can impact the wind patterns.

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10.Give an example of an adaptation in birds, where shape of beak is related to the eating habits of that bird.

Answers

Answer:

It isn't only for the eating habits but also for building nests, hunting small insects, birds, other creatures including defence. Birds have a narrow small throat so the beak helps ripping off small peices of a big animal l(small bird) and for insects they crush and swallow it, they se their beak for feeding their children by grinding food in their beak and transferring it to the youngsters mouth

Which organ system carries materials to human tissues?

Answers

Answer:

Cardiovascular they carry according to me

If 2.2 moles of calcium oxide are decomposed, how many moles of oxygen are produced?
2CaO --> 2Ca + O2

Answers

Answer: Since the reaction is 2Ca(NO3)2 = 2CaO + 4NO2 + O2

1) - given the stoichiometric coefficients, we know that 2 moles of Ca(NO3)2 will produce 4 moles of NO2, hence, 1 mole will produce 2 moles of NO2

2) - 328 g produces 22.4 L, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.

Hence, 65.6 g produces (65.6*22.4)/328 = 4.48 L

3) - 328 g produces 112 g CaO. Therefore, 65.6 g produces = (65.6*112)/328 = 22.4 g CaO.

4) - Given the stoichiometric coefficients, we know 5 moles of gaseous products are already being produces ( 4+1) by 2 moles of reactant.

5) - 44.8 L at STP = 2 moles of NO2, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.

Hence, to produce 2 moles of NO2, we need 1 mole of reactant = 164 g

Hope this helps :)

Explanation:

Why is it important to have the correct atomic number when identifying an atom/element?

Answers

Answer:

The number of protons in an atom is called its atomic number. This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.

Explanation:

Hope this helped!

Complete the calculation to find the mass of 1 mole of water (H2O). Use the atomic weights given in the periodic table. Select the correct option from each drop-down menu.

Answers

Answer:

2x( 1.008 g/mol) +1 x (15.999 g/mol) = 18.015 g/mol

Explanation:

The mass of 1 mole of water (H2O) is 2x( 1.008 g/mol) +1 x (15.999 g/mol) = 18.015 g/mol

What is the mole of one mole of water?

One mole of water is about 18 milliliters.

This is the volume of a few drops of water, 3.65 teaspoons, 1.2 tablespoons, or 0.018 liters. It's not a large volume, yet it contains 6.022 x 1023 water molecules! You can use the same steps to find the mass and volume of any other substance.

How many grams are there in 1 mole of water?

18.02 g

So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.

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I NEED THIS ASAP!! Select all that apply.

Air pollution particles may be removed by _____.

oceans
natural cycles
soil
rain
snow
wind

Answers

Answer:

Natural Cycles

Explanation:

Most sulfur oxides are produced by burning: coal

Air pollution particles may be removed by _____. rain snow wind natural cycles

The three primary sources of air pollution are _____. factories cars electric power plants

The two basic types of air pollutants are _____. gases particulates

May I get brainliest please?

I'm pretty sure it's natural cycles, rain, snow, and wind.
If I'm wrong sorry.

The mole fraction of NaCl in an
aqueous solution is 0.132. How
many moles of NaCl are present in
1 mole of this solution?

Answers

Answer: .132

Explanation:

how does lanthanide contraction influence the density of period 6 transition element

Answers

Answer:

For example, the atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 155 pm (empirical value) and that of hafnium, Hf, (the corresponding period-6 element) is 159 pm. ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3.

Explanation:

There are three bulbs powered by a battery. What will happen if the middle light burns out.

Answers

Answer:

nuclear war ;P

Explanation:

True or false. Microwaves heat food evenly.

Answers

False. It depends on how much time you put into it like 2 minutes or 30 seconds

Answer:

False

Explanation:

When you continuously feed waves into space, there are going to be some cold spots, or "dead spots."

5. How many grams of Al2O3 are dissolved in 852 g of water in a 0.329 m solution of Al2O3?

Answers

Answer:

Al2o3 grams to moles

Explanation:

You can view more details on each measurement unit: molecular weight of Al2O3 or grams This compound is also known as Aluminium Oxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Al2O3, or 101.961276 grams.

AL2o3 grams to moles

Human reproduction involves eggs, ovaries, sperm, and testes.
Which of these are gametes?
A eggs and sperm
B eggs and ovaries
C ovaries and testes
D sperm and testes

Answers

Answer:

A. Eggs and sperm

Explanation:

Genres are an organisms reproductive cells. Also referred to as sex cells. Females they are ova or egg cells, and males they are sperm.

Ahh, help me I don’t know what to pick

Answers

Answer:

for what? is there supposed to be a picture?

Explanation:

In what way have humans selectively bred chickens?

Answers

Depending on color/ mass weight/ egg production

1. Substances in which the bonding is best described as ionic include which of the following?
I. CCL
II. CO :
III. CaCl
(A) I only
(B) III only
(C) I and II only
(D)II and III only
(E) I, II, and III

Answers

Answer:

D.ll and lll only

Explanation:

that is the best ionic also this i s described the oinic

What reactants go into the process?
I

Answers

Answer:

The photosynthesis chemical equation states that the reactants (carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas

Explanation:

Answer:

triangle

Explanation:

dont take me serious

From the balanced reaction:
B2H6 + 3O2 ⇒ 2HBO2 + 2H2O

How many moles of O2 will be needed to burn 36.1 g of B2H6?

Answers

Answer:

The mass of O₂ that will be needed to burn 36.1 g B₂H₆ is 125.29 g.

Select the correct answer.

Which two particles can form an ionic bond with each other?

A.
a negative oxygen ion and a negative chlorine ion
B.
a positive sodium ion and a positive magnesium ion
C.
a positive calcium ion and a negative oxygen ion
D.
a neutral fluorine atom and a negative sulfur ion

Answers

Answer:

C. a positive calcium ion and a negative oxygen ion

Explanation:

Ionic bonds are generally positive and negative because one is gaining electrons while the other is losing.

The term chemical bond generally refers to the attractive force that holds the constituent atoms or ions of a molecular species together. Here an ionic bond is formed between a positive calcium ion and a negative oxygen ion. The correct option is C.

What is an ionic compound?

An ionic compound is formed by the transfer of one or more electrons between the atoms. An ionic bond or electrovalent bond refers to the strong electrostatic forces of attraction that hold together oppositely charged ions.

The number of electrons lost or gained by an atom of an element so as to acquire a stable octet configuration in its outermost shell is called the electrovalency of the element.

Here 'Ca' has 20 valence electrons and 'O' has 6 valence electrons. So in order to attain the stable octet configuration of 'Ar', 'Ca' loses two electrons whereas 'O' accepts two electrons to attain stable octet configuration of 'Ne'.

Thus the correct option is C.

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Answer the following questions.
Q1. How are solids, liquids and gases similar and different from each other?
________________________________________________________________________
________________________________________________________________________
9
Q2. Differentiate mass from volume.
________________________________________________________________________
________________________________________________________________________

Answers

Answer:

Q1: Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Q2: Mass is how much stuff something is made of. Volume is how much space an object takes up.

What is the solution to the following equation? Your answer
should use the correct number of significant figures.
(1.239 + 2.36 + 6.7800) -3.25 =

Answers

Answer:

7.129

Explanation:

1.239+2.36.6.7800

1.25 x 1025 molecules of glucose (C H202) is
how many moles of glucose?

Answers

Answer:

1281.25 Moles of glucose

Explanation:

Multiply 1.25x1025= 1281.25

what is the importance of knowing how to identify structural formula of a compound?

Answers

Answer:

Structural formulas are helpful because they explain the properties and structure of the compound which empirical and molecular formulas cannot always represent.

Explanation:

HOPE ITS HELPFUL FOR U

Look at the leaves on these plants which pair of sentences about the leaves is true

HELP

Answers

The answer is the third one down

You bought a balloon for a birthday party in January. It was so cold outside that you ran into the house and forgot the balloon in the car. You go out to the car a few hours later and get the balloon. You noticed that the balloon was a little deflated. Once you brought the balloon into the house, after about 20 minutes, the balloon was back to normal.

Part A: Explain what happened to cause the balloon to deflate and then inflate. Be sure to use unit vocabulary and specific details to support your answer.

Part B: Using the information you provided in Part A, explain what would happen if you left an inflated balloon in the car on a very hot summer day.

Answers

Answer:

Part A: When air is left in specific environments, it can either expand or contract depending in the given environment, so, if left in a cold car for a few hours, the air inside said balloon will contract.

Part B: If left in said car on a very hot summer day, the air in said balloon will expand, and if left in said car long enough, said balloon will explode due to the air inside expanding

Hope this helped!

which of the following is unbalanced

A. SnO2 + H2 → Sn + 2 H2O
B. 2Na + 2H2O → 2NaOH + H2
C. N2O5 + H2O → HNO3
D. 2Fe + 3Cl2 → 2FeCl3

Answers

Answer:

The unbalanced chemical equation is;

C. N₂O₅ + H₂O → HNO₃

Explanation:

In balancing a chemical reaction equation, only the coefficients of the terms of the reactants and/or the products are adjusted (and not the subscripts to the atoms in the compounds) to ensure that the total number of each element is the same on either side of the arrow for the chemical reaction

A coefficient term is the number multiplier of the compounds and elements in a chemical reaction

Therefore, the balanced chemical equation is obtained by changing the coefficient of the product from the implied '1' to a '2' as follows;

N₂O₅ + H₂O → 2HNO₃

If we add 150mL of ammonia to 150mL of water, what is the concentration by volume?

Answers

Answer:

buffer solution

Explanation:

a compound contain 8.57g of carbon and 1.43g of hydrogen. The relative formula mass is 70 calculate the empirical formula of the compound and the molecular formula of the compound

Answers

Answer:

Empirical formula: CH2

Molecular formula: C5H10

How many total atoms are in 12 NaBr?

Answers

the total atoms are equal to 1 atom.

Someone please answer this in like 40 minutes
Before it’s due. Explain the answer too

Answers

Answer:

kkkwkisa

Explanation:

wulaoaiq8qiIq8qiaik

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Her parents expect that she will go to Harvard University, starting school on her 18th birthday. She will only take four years to complete her degree. Currently, tuition and housing costs total $65,000 per year, which are paid at the beginning of each school year. These expenses are expected to increase at the rate of inflation which will run 4% annually for the next 25 years. In each year until Mary enters Harvard University, Marys parents will make a deposit into the college fund to exactly provide for all of the costs of her education when she enters college (the first deposit will be made one year from today). Since her parents expect their income to grow at the rate of 2% annually, they would like the amount that they put each year into the fund to increase in nominal terms at the rate of 2% annually. Marys parents can earn a rate of 10% annually on their investments and they face a 30% tax rate. A. 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