Chemistry High School

pls help question 2 ill attach a picture​

Pls Help Question 2 Ill Attach A Picture

Answers

Answer 1

Answer:

X 154

Check solution in explanation

Explanation:

Average atomic mass = ( mass 1× abudance) + ( mass 2× abudance)+ ( mass 3× abudance) / 100

(149×13.8)+(152×44.9) +(154×41.3)/100

2056.2 + 6824.8 + 6360.2/100

=152.412

Related Questions

b. How do metals and non-metals differ chemically?
1​

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Non metals can not give electrons to hydrogen in water to be released as H2 gas

Need help fast!!!!!!!!!!!

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I think it’s the second one!! Hope this helps! BRANLIEST plzzzz

How much silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate?

Answers

Answer:

Calculate the mass of silver phosphate produced if 30.0 grams of silver acetate completely reacts with sodium phosphate.

According to stoichiometry of the balanced chemical reaction between silver phosphate and silver acetate 8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.

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 reaction 500.73 g of silver acetate produces 418.58 g silver phosphate, thus 10 g  silver acetate is produced when 10×418.58/500.73 =8.359 g.

Thus,  8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.

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what is diatomic element?​

Answers

Answer:

it is molecular of an elements that consists two atoms

Which of these electron configurations is not possible?

Answers

Answer:

D

Explanation:

Electrons are being filled according to the increasing other of their sublevel energy

What are 1a 3b and 7a explains on the periodic cable

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Answer:

Explanation:

1a=group 1 elements(H,Li,Na,K....)

3b=group 3 elements (Sc,Y,La....)

7a=group 17 elements (F,Cl,Br,I....)

Subject: Chemistry


whoever does this right will give the brainliest <3)

Answers

Answer:

1 A

3 main types of bond are

Ionic bond ( formed due to complete transfer of electron between atoms(

Covalent bond ( formed by mutual sharing of electron)

Metalic bond ( present in the metals due to mobile electrons)

1 B bond in CaO is ionic bond formation in attached image

1 C hydrogen bond with nitrogen is covelent NH3 ammonia is formed because a bond between two non metals is expected to be covalent

More their electronegativity difference between hydrogen and nitrogen is less than 1.7 that makes it covalent

Explanation:

Answer: This looks tough

Explanation:

which is equal to a tempature of 20 c. 20 F. 68F. 36F. 32F

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Answer:

68F

Explanation:

Which of the following is an example of a chemical reaction?

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Answer:

where is the option I can't see plz give the option first the I try to give answer

Jane believe that plate tectonics is a theory, and Mario believes it is a law. Which of the following best support Jane's argument?

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Answer:

A

Explanation:

i did this and its right

As the sun sets, the temperature of the room decreases. Explain how this affects the particle motion of the gas particles in the room. Be sure to include collisions, kinetic energy, pressure, and thermal energy in your answer.​

Answers

Answer:

Heres a very LONG answer-

The real answer:

Its in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles.

What is an acid in Science​

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An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxide ions is shifted. Now there are more hydrogen ions than hydroxide ions in the solution.

Answer :An acid is any hydrogen containing substance

Explanation: i hope it helps i got a little help from a friend

in terms of their electron configurations, why is cesium more likely to lose its valence electron than potassium?
use the term “shielding” in your response if possible

Answers

Explanation:

use the term electron sheilding, the more electrons between the valence el3ctron and nucleus the easier to lose the valence electron (more sheilding = easier to lose)

Plants give off oxygen as part of photosynthesis. Explain the impact of this process on humans?

Answers

Answer:

i think it haven't impact because oxygen is very sensitive for our life and from plants there is so many kinds of food sources soo

Identify and describe the processes that change rock below Earth's surface.

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Answer:

crystallization, metamorphism, and erosion and sedimentation.

~+lil more info+~

The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.

If 4.2 g of water is actually produced, what is the percent yield?

Answers

Answer:

23.33%

Explanation:

from

percent yield=(mass÷total mass )×100%

PLEASE HELP ME!!

Which shows three human body parts in order from the simplest level of organization to the most complex?

A. red blood cell → nervous system → bone tissue
B. nervous system → bone tissue → red blood cell
C. red blood cell → heart tissue → circulatory system
D. bone tissue → red blood cell → nervous system

Answers

Answer:

C

Explanation:

C. red blood cell → heart tissue → circulatory system

the order of organisation is

cell --> tissue --> organ --> organ system --> organism

hope this hepls x

branilest plz?

Answer:

C is the answer

the red blood cell are a part of the heart tissue which makes up the circulatory system

Which of the following scenarios would not prompt the cell to start dividing

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Answer:

what r the options??????

Why water in considered as compound?​

Answers

Answer with Explanation:

Water is a compound because it consists of two types of atoms (Hydrogen and Oxygen) that are chemically bonded. An "element" only consists of one type of atom, therefore, water is not an element but a compound. Its chemical formula is: [tex]H_{2} O[/tex]. This means that water consists of 2 atoms of Hydrogen that are bonded to an atom of Oxygen. Take note that a compound is different compared to the elements that it is made of. For example, water is essentially liquid in its form but it is different from the atoms of Hydrogen and Oxygen, which are gas in form.

Answer:

Water is a compound. It contains more than one element: hydrogen and oxygen atoms are joined together; as illustrated in the video clip Elements and Compounds, above. ... Water is not simply a mixture of hydrogen and oxygen; it contains hydrogen and oxygen atoms linked together in an ordered way.

How many moles in 435 liters of Krypton gas at STP?

Answers

Answer:

19.4 mol Kr

General Formulas and Concepts:

Chemistry

Stoichiometry

Using Dimensional Analysis

Gas Laws

STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 K

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Explanation:

Step 1: Define

435 L Kr at STP

Step 2: Identify Conversions

[STP]   22.4 L = 1 mol

Step 3: Convert

[tex]435 \ L \ Kr(\frac{1 \ mol \ Kr}{22.4 \ L \ Kr} )[/tex] = 19.4196 mol Kr

Step 4: Check

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

19.4196 mol Kr ≈ 19.4 mol Kr

Living Things and Energy
1. Identify one reason why all plants need energy.
A. to produce new cells and structures
* B. to absorb sunlight
C. to absorb oxygen
D. to release carbon dioxide
Try Again

Answers

A. to produce new cells and structures
The answer is A. To produce new cells and structures

How do the force factors compare to the products of the masses?

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Answer:

The force factors are equal to the first numbers of the products of the masses in scientific notation.

Explanation:

Ex. 1.0 x 10^5 kg^2 then the force factor would be 1.

ex. 3.0 x 10^12 kg^2 then the force factor would be 3.

To solve this we must be knowing each and every concept related to  scientific notation and its calculations. Therefore, in scientific notation, the force factors seem to be equivalent to the first digits of the masses' products.

What is scientific notation?

Mathematics is a way of representing numbers using a decimal number ranging from one to 10, but not 10 multiplied by a factor of 10. The most common type of mathematical notation is All numbers in scientific notation are expressed in the generic form N 10m.

In scientific notation, the force factors seem to be equivalent to the first digits of the masses' products.

Example1 1.0 x 10⁵ kg² , force factor is 1.

Example2 3.0 x 10¹² kg² ,force factor is 3.

Therefore, in scientific notation, the force factors seem to be equivalent to the first digits of the masses' products.

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There is a mixture of three gases. We know the total pressure is 2.50 atmosphere and the pressure of the oxygen and the nitrogen in the mixture are 0.52 atmosphere and 0.84 atmosphere. The jar containing the gases has a volume of 25.0 liters and is at a temperature of 32 degrees Celsius. What are the pressure and the number of moles of carbon dioxide in the container?

Answers

Answer:

1.14 atm and 1.139 mol

Explanation:

The total pressure of the container is equal to the sum of the partial pressure of the three gasses:

P = Poxygen + Pnitrogen + Pcarbon dioxide2.50 atm = 0.52 + 0.84 + Pcarbon dioxide

Now we solve for the pressure of carbon dioxide:

Pcarbon dioxide = 1.14 atm

To calculate the number of CO₂ moles we use PV=nRT:

P = 1.14 atmV = 25.0 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 32 °C ⇒ 32 + 273.16 = 305.16 K

1.14 atm * 25.0 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 305.16 K

n = 1.139 mol

Which waves carries the most energy?


HURRY PLZZ!!!!

I NEED HELP FAST!!!

GOD BLESS!!!

THE SUBJECT IS SCIENCE I CAN´T FIND IT!!!!!!!!!!!

Answers

Answer: D Because it is moving at a fast pace

Explanation:

The higher the amplitude the more energy a wave has. So A should be your answer

Which covalent bond is the most polar?
a) S-O
b) C=0
c) Se-F
d) H-O
e) O=O

Answers

A I think let me know if it’s wrong

When calculating the amount of product formed during alcohol fermentation, one mole of ethanol is chemically equivalent to what volume of CO2 (g) measured at 1 atm and 273 K

Answers

Answer:

44.8 dm^3

Explanation:

The equation for the fermentation of glucose is;

C6H12O6 -----> 2C2H5OH + 2CO2

This means that two moles of ethanol carbon dioxide are produced.

If 1 mole of gas at STP occupies 22.4 dm^3, then two moles occupies; 22.4 dm^3 × 3 = 44.8 dm^3

chemical formula of magnesium
oxide using Criss cross method​

Answers

Answer:

Crisscross method is simply writing the charges crossly near each element. Since oxidation number of Mg (metal) is +2 and oxygen (nonmetal) is -2, if we cross them and write next to each; we get Mg2O2 .

Need help!!! Don’t understand

Answers

A) Neither carbon nor oxygen has satisfied the octet rule

To begin with...

The bond between carbon and oxygen is suppose to have 3 bonds in between

Second:

The lone pairs are not drawn. Since carbon monoxide has 3 bonds in between it should have a lone pair (2 dots) left over on each atom.

Reminder: in order to satisfy the octet rule EACH atom must have 8 electrons. Carbon has 4 valence shell electrons and oxygen has 6. In order to satisfy this rule, there should be 3 bonds in between which makes a total of 6 for each atom plus the lone pairs that make up the 8.

I hope that’s not too confusing, if you still have any questions please let me know in the comments (:

Is honors high school chemistry hard? Is it hard mathematically? please answer ASAP i have to put in my courses for next year.

Answers

Explanation:

yes its hard if you don't pay attention.

Yes, the math is harder but chemistry is not it's really fun the math does get harder tho.

how many atoms are in a compound

Answers

Answer:

Compounds are made of two or more atoms of different elements,

Explanation:

Answer:

6.022×1023 atoms —1.00 mol of atoms.

Explanation:

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