Determine the number of valence electrons for each of the following:
O
Cs
Ca
Se2-
Na+
C
N
Al
He

Answers

Answer 1
O has 6
Cs has 8
Ca has 2
Se2 has 18
Na+ has 1
C has 4
N has 5
AI has 3
He has 2
There those are the answers!!!

Related Questions

Predictions about the future based on the position of planets is an example of physics biology earth science pseudoscience

Answers

Answer:

Pseudoscience

Explanation:

Predicting the future based solely on the position of the planets is an example of pseudoscience.

Pseudoscience is a body of knowledge that is not based on the scientific method but on some unverifiable/unprovable claims.

Predictions about the future can only be valid if it is based on the scientific method, not just about the position of the planet. The scientific method involves observation, hypothesis formulation, testing of the hypothesis through repeatable experiments, and arriving at conclusion.

Any other statement or belief that is not based on these procedures is said to be pseudoscientific.

Answer:

The answer to your question is pseudoscience.

Explanation:

I took the module 1 exam and got it right, yesterday.

What salt would form when each of the following
strong acid/strong base reactions takes place?
a. HCl(aq) + KOH(aq)
b. RbOH(aq) + HNO3(aq) -
C. HCIO4(aq) + NaOH(aq) →
d. HBr(aq) + CsOH(aq) →

PLEASE HELP I NEED TO TURN IT IN !! IN 10 MINUTES

Answers

a.KCl
b.RbNO3
c.NaCl
d.CsBr

DESCRIBE the five types of chemical reactions
(Synthesis, Decomposition, Single displacement, Double displacement, Combustion)

Answers

Syntesis- is a reaction that occur when two different atoms interact to form a different compound.
Decomposition- is a reaction in which compound breaks down into two or more simple substances.
Single displacement- is a reaction in which one element is substituted for another element in a compound
Double displacement- is a reaction in which the reactant ions exchange places to form new products.
Combustion- is a reaction in which the substance reacts with oxygen from the air, simply said combustion is when something’s burininv.

The study of chemicals is called chemistry.

When two elements react together to form a new compound is called a reaction.

When two-element join together to form a new compound is called synthesis.

[tex]C + O_2 --> Co_2[/tex]

The breakdown of a compound into two different elements is called decomposition.

[tex]H_20 ----> H_2 + O_2[/tex]

The substitute of one element in the compound is called single displacement.

[tex]Fe + H_2So_4---> FeSo_4+ H_2[/tex]

The substitute of two-element in the compound is called double displacement.

[tex]BaCl + H_2So_4 + ---> BaSo_4 + HCl[/tex]

The burning of the element in the presence of oxygen is called a combustion reaction.

[tex]C + O_2 ---> CO_2[/tex]

Hence, the answer is mentioned above.

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The ability to pound metal into a flat sheet without breaking it is:

A. Luster
B. Malleability
C. Ductile

Answers

Answer: B

Explanation: Cuz .

Answer: The answer to your question is A

Explanation: Hey I miss you

What is the % of water in (MgSO4 . 2H2O)?

Answers

Answer: A hydrate is found to have the following percent composition: 48.8% MgSO4 and 51.2% water.

Explanation:

i dont know

What is the temperature change that 725 g of aluminum will undergo when 2.35 x 104
J of thermal energy are added to it?

Answers

Answer:

36°C

Explanation:

Given parameters:

Mass of aluminum = 725g

Quantity of heat  = 2.35 x 10⁴J

Unknown:

Temperature change  = ?

Solution:

To solve this problem, we simply use the expression below:

  The quantity of energy is given as:

          Q  = m C Δt

Q is the quantity of energy

m is the mass

C is the specific heat capacity of aluminum  = 0.9J/g°C

Δt is the change in temperature

  The unknown is Δt;

             Δt  = [tex]\frac{Q}{mc}[/tex]    = [tex]\frac{2.35 x 10^{4} }{725 x 0.9}[/tex]    = 36°C

A gas has a volume of 250.0 liters at 17.0 °C and 3.00 atm of pressure. what volume must the gas be increased for the gas to be at STP conditions?

Answers

Answer:

0.706 L (Liters)

Explanation:

P1V1 = P2 V2 3 atm 250.0 mL = 1 atm X

T1 T2 290 K 273 K

706 mL = X

The increased volume will be "706 L".

According to the question,

Pressure,

Initial, [tex]P_1 = 3 \ atm[/tex]Final, [tex]P_2 = 1 \ atm[/tex]

Temperature,

Initial, [tex]T_1 = 17^{\circ} C[/tex] or, [tex]290 \ K[/tex]Final, [tex]T_2 = 273 \ K[/tex]

Volume,

Initial, [tex]V_1 = 250 \ L[/tex]Final, [tex]V_2 = \ ?[/tex]

By using the Boyl's and Charl's combination law, we get

→ [tex]\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}[/tex]

or,

→ [tex]V_2 = \frac{P_1 V_1 T_2}{T_1 P_2}[/tex]

By putting the values, we get

→      [tex]= \frac{3\times 250\times 273}{290\times 1}[/tex]

→      [tex]= 706 \ L[/tex]

Thus the aforementioned answer is right.

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Are two atoms of the same element identical?

Answers

Answer:Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.

Explanation:This is not mine write it in your own words.

why do water bodies evaporate.

Plss I need help​

Answers

Answer:

the heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas.

Explanation:

please tell me if I'm wrong

Which of the following molecules is most likely an enzyme?
water
glucose
protease
monosaccharide

Answers

Answer:

protease is an enzyme

Explanation:

It hydrolyse peptide bonds of proteins and also called proteolytic enzymes.

protease! - it as an enzyme :)

If light and sound Travel from point a to point b And start at the same time, which is gonna reach point b first

Answers

Light would reach point b first

C₃ H8
What is the subscript for carbon in this molecule?

Answers

Answer:

3

Explanation:

Subscript basically tells you the number of element or ions present in a compound. In this case the subscript of carbon which is 3 denotes that only three carbon atoms is present in the compound.

TOMMY (persistently but a little intimidated by the crowd) It's always that way, in every story I ever read about a ship landing from outer space. —The Monsters Are Due on Maple Street, Rod Serling What scientific fact is Tommy’s theory based on? Meteors can do some crazy things. Spaceships often land on Earth. Technology makes space travel possible. Meteors can move people from planet to planet.

Answers

Answer:

Technology makes space travel possible.

Explanation:

bc the guy above me is wrong I had to guess and I got it right

Answer:

Technology makes space travel possible.

Explanation:

got it right on edge

Is a cell wall found in a plant cell?

Answers

Answer:

A plant cell has a cell wall but an animal cell dosnt have one

Explanation:

Brainliest plz

Explanation:

the cell wall surrounds the plasma membrane of the plant and provides tensile strength and protection against mechanical

Which statement best explains the net transfer of energy that is about to
happen in this photo?
A. The racket and the ball will both gain kinetic energy.
B. The ball will gain kinetic energy, and the racket will lose kinetic
energy
C. The racket will gain potential energy, and the ball will lose kinetic
energy
D. The racket and the ball will both lose potential energy

Answers

Answer:

Explanation:

B I got it right

Answer:

B. The ball will gain kinetic energy, and the racket will lose kinetic

energy

Explanation:

Substance X has a specific heat capacity that is twice as large as Substance Y. If both samples ended up at the same change in temperature from the same amount of energy added, what is the relationship between the masses of the two samples? Explain.

Answers

Answer:

Substance X has a smaller mass

Explanation:

The relationship between the mass of the two samples is that the mass of X is smaller compared to the mass of Y.

 The specific heat capacity is given as:

         C  = [tex]\frac{H}{m x change in temperature}[/tex]

We can see that the higher the specific heat capacity the lesser the mass or simply put, the specific heat capacity of a body is inversely related to its mass.

If the amount of heat is constant i.e the same and the specific heat capacity of X is twice that of Y, then substance X has a smaller mass


help plz and can you plz use terms

Answers

I’m not sure but I hope yu get the right answer sorry

What is the empirical formula for C10h22

Answers


The empirical formula is
C5H11


Explanation:
We have decane, the alkane with a chemical formula of
C10H22
.
The empirical formula of a substance has the smallest ratio between the elements its composed of.
Here, we got the carbon to hydrogen ratio as
10:22
. So, we need to find the greatest common factor between the two numbers.

10=2*5

22=2*11

As you can see here, the greatest common factor between the two numbers is
2
, and so we divide both numbers by
2
.
10/2=5

22/2=11


And so, the new formula becomes

C5H11

As the human population grows, the size of cities increases. As cities grow, more land must be cleared to make way for homes, businesses, and roads. Which two events would be likely effects of replacing a forested area with an urban area? A. More air pollution because there are fewer trees to take in carbon dioxide B. Less erosion of soil as plants covering the ground are added to gardens C. Fewer birds and other wildlife because they have fewer places to live D. More trees because of increased solar energy in the area​

Answers

Answer:1. Introduction

The main air pollutants are represented by gases forms, particles in suspension, different ionizing radiation and noise.

The gases forms are: oxidized and reduced forms of carbon (CO2, CO, CH4), of nitrogen (NO2, NO, N2O4, NH3, NH4+), SO2, O3, C6H6 vapours, Hg, volatile phenols, Cl2, etc.

The particulate forms are: PM10 and PM2.5 particulate matter, heavy metals with toxic effect (Pb, Ni, Cd, As), polycyclic aromatic hydrocarbons PAHs, etc.

Atmospheric pollutants have a negative effect on the plants; they can have direct toxic effects, or indirectly by changing soil pH followed by solubilization of toxic salts of metals like aluminum. The particulate matters have a negative mechanical effect. They cover the leaf blade reducing light penetration and blocking the opening of stomata. These impediments influence strongly the process of photosynthesis which rate declines sharply.

Explanation:

Answer:

A More air pollution because there are fewer trees to take in carbon dioxide

C Fewer birds and other wildlife because they have fewer places to live

Explanation:

I took the test on A P E X

What is 2+2 plzzzzz help I’m only 83

Answers

Answer: 4

Explanation: if you move to spaces in a number line from 2 you would be at 4

which organs are part of the respiratory system ​

Answers

It includes the lungs, airways, and blood vessels. The muscles that power your lungs are also a part of the respiratory system.

What colors are absorbed Best Buy the plant gizmo

Answers

Answer:

Yellow and Green

Explanation:

It is not blue the graph shows is isnt blue so the colors that absorbed the worse were green and yellow

Blue and red are the colors that plants can absorb the most. The pigments used for photosynthetic processes, such as chlorophyll in plant cells' chloroplasts, are what absorb particular visible-spectrum light wavelengths.

The energy of specific light wavelengths is absorbed by special pigments in chloroplasts of plant cells, resulting in a chemical chain reaction that is known as the light-dependent process of photosynthesis. The best visible light wavelengths for photosynthesis are in the blue (425–450 nm) and red (600–700 nm) ranges.

Chlorophylls do not absorb light at green and yellow wavelengths, as shown by the extremely low level of light absorption between 500 and 600 nm.

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Bill stands in a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface which process causes this difference in temperature?
1. convection
2. evaporation
3. radiation
4. conduction

Submit Answer​

Answers

Answer:

convection

Explanation:

I think answer should be convection please let me know if it’s correct or not okay thanks bye

In mass-volume and volume-mass calculations, all gases are
considered to be at standard
____
and pressure, also
referred to as
___


answer: temperature, stp
:P

Answers

Answer: temperature, Stp

Explanation:

The calculation for standard temperature and pressure has been referred to as STP.

The mass-volume and volume-mass, has been the measurement of the concentration of the solution.

The mass-volume has been the measurement of mass of sample in the volume of solution. The volume by mass has been the measurement of the volume of solute to mass of solution.

Standard conditions

The measurement has been performed with the standard conditions of temperature and pressure.

The standard temperature has been 273.5 K and standard pressure has been 1 atm. These temperatures and pressure has been referred to as STP.

Thus, the calculation for standard temperature and pressure has been referred to as STP.

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0.65743 In scientific notation

Answers

202827.0000 is the answer I think idrk

help Mepleaseeeee !!!

Answers

Answer:

The 500kg boulder

Explanation:

500kg Boulder, the answer u have rn is right

what is selection in science?

Answers

Answer:

Selection, in biology, the preferential survival and reproduction or preferential elimination of individuals with certain genotypes (genetic compositions), by means of natural or artificial controlling factors.

Explanation:

Hope it helps you


Natural selection, process that results in the adaptation of an organism to its environment by means of selectively reproducing changes in its genotype, or genetic constitution.

How many molecules of carbon dioxide are in 12.2 L of the gas at STP?

Answers

Answer:

Converting Between Moles and Liters of a Gas at STP. To convert between moles and the volume of a gas at STP, we will use the factor label method discussed in the first unit. This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L.

Explanation:

One molecule of carbon dioxide at STP has a volume of 22.4 liters . Thus number of molecules of carbon dioxide in 12.2 L is 3.27 × 10²³ molecules.

What is one molecule?

A molecule is formed by the combination of same or different kinds of atoms. A number molecules together form a compound. Water, carbon dioxide etc. are compounds.

One mole of a molecule contains 6.022 × 10²³ number of atoms. Similarly, one mole of a compound contains, 6.022 × 10²³ number of molecules.This number is called Avogadro number.

At standard temperature and pressure (STP) that is at 298 K and 1 atm pressure, one mole of any substance carry 22.4 L. Thus number moles of 12.2 L of carbon dioxide is 12.2 / 22.4 = 0.54 moles.

Number of molecules = 0.54 moles × 6.022 × 10²³

                                     =  3.27 × 10²³

Hence, number of molecules of carbon dioxide in 12.2 L is 3.27 × 10²³ molecules.

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What might the student have done that caused this
error? List all possible causes.

Answers

Answer:

The capillary tube was too close to the bottom of the beaker.

The ruler may have moved.

Water got into the capillary tube.

The temperature was not allowed to equilibrate in the 2-4 minutes.

Explanation:

what is a solution for deforestation



(full sentences please)

Answers

The best solution to deforestation is to curb the felling of trees by enforcing a series of rules and laws to govern it. Deforestation in the current scenario may have reduced; however, it would be too early to assume. The money-churner nature of forest resources can be tempting enough for deforestation to continue.

The best solution to deforestation is to curb the felling of trees by enforcing a series of rules and laws to govern it. Deforestation in the current scenario may have reduced; however, it would be too early to assume. The money-churner nature of forest resources can be tempting enough for deforestation to continue.

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