Please I have no idea my teacher didn’t teach this

Answer:

Ionic bond is the intermediate in strength.

Explanation:

Ionic bond is weaker than covalent bond and stronger than hydrogen bond in strength because in ionic bond, the atoms attract each other due to opposite in charge. Ionic bond is a type of bond in which one atom losses electron completely and become cation (positive charge) while the other atom receive the electron and become anion (negative charge). so they attract each other due to opposite charges.

Answer:Cost benefit analysis

Explanation:

Production, distribution, exchange, consumption, saving, and investment of economic resources are all a part of economic decisions. Public and private objectives. Economic choices are made in order to further the interests of both the general public and private persons and organizations (public goals).

The purchase of a device at a specific price is a straightforward illustration of an individual economic decision. This person will have to decide whether it is worthwhile to use his or her limited financial resources to purchase a device. A family's financial decision is virtually analogous, except that it involves more people this time.

The laws of supply and demand are used in the marketplace to guide economic decisions. The term describes the process of making an economic decision as a cost-benefit analysis.

To know more about economic decisions, visit;

https://brainly.com/question/30309563

#SPJ4

Answer:

The comparison of the damages generated by Hurricane Donna with respect to others. The empirical information that can support this may be the number of homes affected or the cost of repairs after the hurricane has passed until it stops.

Explanation:

Empirical knowledge is the knowledge that it generates from experience and observation, perception tells us how something works and its natural characteristics.

If a scientist assures that it was the most severe hurricane, it is because the scientist is comparing the disasters generated by Hurricane Donna with other ones.

Answer:

I'm not quite sure.....

Explanation:

Answer:

Hey there!

Density=Mass/Volume

Density=1.2/4555

Density=2.63e-4g/cm^3

Let me know if this helps :)

Answer:

Mass of CO2 WILL BE ~ 9.33 g

Explanation:

Moles of O2 = 14/18

Let the mass of CO2 be x

Then moles of CO2 will be = x/12

moles of CO2 = moles of O2

x/12 = 14/16

x = 9.33 grams

Answer:

in a laboratory

Explanation:

A controlled experiment refers to the one where everything is an experiment except a single variable is held constant. A collection of information is typically taken as a control group, which is generally the ordinary state, and another group is analyzed( such as chemical reaction as per the question) in which all conditions are similar to the control group except for the variable under examination. The main benefit of a controlled experiment is that confusion over the accuracy of the results can be eliminated more easily.

Answer  make sure yu read bk the answer is in the question

Explanation:

Answer:

4/8 for pepperoni and 3/8 for cheese

Explanation:

Try these!

Answer:

Fractional column is an essential item used in distillation of liquid mixtures so as to seperate the mixture into its component parts, or fractions based on the differences in volatilities.

Explanation:

Answer:

13.5

Explanation:

Potassium hydroxide fully ionizes when dissolved in water according to the following equation:

K

O

H

→

K

+

+

O

H

−

Now, let's find the relationship between

K

O

H

and

O

H

−

1

  :  

1

ratio

⇒

[

K

O

H

]

=

[

O

H

−

]

=

6.7

×

10

−

3

M

In any aqueous solution,

[

H

3

O

+

]

and

[

O

H

−

]

must satisfy the following condition:

[

H

3

O

+

]

[

O

H

−

]

=

K

w

[

H

3

O

+

]

=

K

w

[

O

H

−

]

[

H

3

O

+

]

=

1.0

×

10

−

14

6.7

×

10

−

3

[

H

3

O

+

]

=

1.5

×

10

−

12

M

Now, after finding the concentration of the hydronium ion, the pH of the solution is determined:

p

H

=

−

log

[

H

3

O

+

]

p

H

=

−

log

[

1.5

×

10

−

12

]

p

H

=

11.83

Other Method

Find the pOH using the concentration of the hydroxide ion, then use the formula

p

H

+

P

O

H

=

14

to find the pH.

The -Hasselbalch equation may be used to get the pH of 0.00035 M KOH.

According to this formula, the pH of a solution is determined by adding the pKa of the acid and the logarithm of the base to acid ratio. KOH has a pKa of 14.0.

Therefore, the following formula can be used to determine the pH of the 0.00035 M KOH solution: pH = 14.0 + log (0.00035/1) pH = 14.0 - 3.46 As a result, the pH of the KOH solution at 0.00035 M is 10.54. Since KOH is a strong base, it completely dissociates in water, forming a solution that is made up of K+ and OH- ions.

Water reacts with hydroxide ions to make hydronium ions (H3O+), which are created when a strong base is introduced. The amount of hydronium ions in the solution rises as a result of this reaction, which lowers the pH of the liquid.

A KOH solution with a pH of 0.00035 M has a value of 10.54, which is higher than the pH of pure water (7.0). This is because when KOH dissociates in water, hydronium ions are produced. A solution's acidity or alkalinity can be determined using the pH of a 0.00035 M KOH solution.

A solution's pH is measured between 0 and 7, with 7 being neutral or alkaline and 0 being acidic. Since 0.00035 M KOH has a pH of 10.54, which is higher than 7, the solution is either basic or alkaline.

Learn more about  pH  at:

https://brainly.com/question/15289741

#SPJ3

Answer:

it us false

Explanation:

air and gas don`t have definite shape

but solid have all definite

Answer:

Yes

Explanation:

Some environmental factors- chemical, physical (UV), and biological (poisonous plants)- have the capability to damage DNA. This can lead to mutation, cell death, and several ailments.

Chemicals such as pesticides and heavy metals can be found in the environment (air, water) or in some consumer products.

The presence of Lead and a reactive oxygen species can result in DNA damage. Arsenic is classified as a carcinogen (cancer-causing substance).

More details are found in scientific articles online, but here's a helpful snippet- "heavy metal exposure can contribute to genetic damage by inducing double strand breaks (DSBs) as well as inhibiting critical proteins from different DNA repair pathways"

Lead and arsenic are heavy metals that are considered carcinogens. These metals cause alteration and damage to the genetic material and protein synthesis.

Carcinogens are said to be a substance that can lead to cancer in an organism and are produced naturally from viruses and ultraviolet rays or mna made by cigarette smoking and chemicals.

Their high exposure causes the breaking of the double strand of the DNA molecule in the cells that inhibits and prevents protein formation leading to interference with the DNA repair pathways.

Cadmium, lead, arsenic, etc., are heavy metals that are released by human activities and alter the genetic mechanism and composition leading to mutation and disorders like skin cancers, lung cancer, etc.

Therefore, lead and arsenic is carcinogens that damage DNA.

Learn more about carcinogens here:

https://brainly.com/question/27692313

#SPJ2

Answer:

Explanation:

An atom is composed of a nucleus and electrons orbiting around it,and the nucleus itself contains protons and neutrons (with the exception of protium, an isotope of hydrogen with only a proton in the nucleus) because each element contains a specific and unique number of protons, but the number of neutrons can vary,an element, therefore, can have several variants, called isotopes, which differ slightly in the composition of the nucleus,the number of electrons can also change in an atom, giving us positive or negative ions.

=Br-79 has 79 nucleons. 79 protons and neutrons. We know that bromine has 35 protons, and 35 electrons, so all we need to do is subtract. 79 nucleons - 35 protons = 44 neutrons,

Subtract the atomic number from the mass number,the result gives you the number of neutrons in the isotope,look to see if the isotope has a charge, denoted by a superscript number and a plus or minus sign next to it,subtract the charge from the atomic number if the charge is positive,the result is the number of electrons in the isotope,add the absolute value of the charge to the atomic number if the charge is negative,the result is the number of electrons in the isotope.

= 35 from 79 and you will get 44. 44 is the number of neutrons in the Br-79 isotope.

79-Br+, that means:

It’s still a Br (bromine) atom, so it doesn’t change the number of protons //because changing the number of protons, it won’t be bromine anymore//

So bromine atom has 35 protons

So, isotope means many forms of atoms with the same element, which are different from atomic mass (or more clearly, the number of neutrons) → 79 (this number is shown for the atomic mass) - 35 = 44 neutrons

It has 35 protons, 34 electrons and 44 neutrons. The way to figure this out is - the protons of an element never change. So when you say bromine, you look it up on the Periodic table and you see its atomic number (aka # of protons) is 35. It will always be 35 for bromine. Then you take the charge into account. In this case, the charge is +1. Since protons can’t change, electrons must. One more proton equals one less electron. So 34 electrons. The atomic weight of a number (79 in this case) is = # of protons + # of neutrons. So neutrons = 79 - 35 = 44.

Hope this helps!

Answer:

Hope it helps you dude :)

Answer:

There are 17.64% students received B+ grades.

Explanation:

It is given that,

Total number of students in chemistry class is 17

We need to find the percentage received by B+.

Number of students having B+ grades are 3 (from graph)

Required percentage = [tex]P=\dfrac{3}{17}\times 100=17.64\%[/tex]

So, there are 17.64% students received B+ grades.

Answer:

2 protons, 1 electron, 7 neutrons, and 3 electrons

Explanation:

Make a He atom with a mass of 4. How many protons did you put in the nucleus?

2 protons

Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital  (ring)?

1 electron

Make a N atom with a mass number of 14. How many neutrons are in the nucleus?

7 neutrons

Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?

3 electrons

Answer:

2 protons, 1 electron, 7 neutrons, and 3 electrons

Explanation:

• Before the balloon was placed inside the hot water, the pressure was the same inside and outside the balloon. The hot water raised the kinetic energy of the air molecules inside the balloon, expanding the balloon, through thermal expansion.

• (1) the pressure of air inside the balloon increased, (2) the volume of the inside of the balloon increased as well, and (3) the temperature of the balloon increased. Note that pressure and volume are inversely proportional, and pressure and temperature are directly proportional. Therefore as the temperature increases, the pressure inside will increase, causing an increase in the volume. At a certain point though the volume will increase too much as to cause a significant decrease in pressure.

• The air molecules will gain kinetic energy, hence (1) increasing the molecules's speed, and (2) heating the air molecules.

Answer:

The mass of the forest comes from carbon and carbon is retrieved from carbon-dioxide that trees used during the process of photosynthesis. In the process of photosynthesis, carbon-dioxide is utilised from the atmosphere by trees and release oxygen and ATP.

When the forest burns the mass again releases to atmosphere in the form of carbon which causes air pollution and increases carbon content in the atmosphere.

Answer:

It is petroleum-derived product comprising a mixture of liquid aliphatic and aromatic hydrocarbons, ranging between C4 and C12 carbon atoms with the boiling range of 30–225°C

Explanation:

Gasoline is a mixture of paraffins, naphthenes, aromatics and olefins.

Answer:

I'm pretty sure is a mixture

Answer:

first conclusion was that the whole world is made up of only 4 elements but as the time passed more elements were discovered... if the world would not contain more elements... you wouldn't be alive.

Answ  Es la B .

Explanation

By raising the temperature of a liquid, it turns into a gas, therefore its particles will have more movement and its kinetic energy will increase. the more you raise the temperature, the more space they will have between the molecules.

Answer:

The percentage error is -2.4 %

Explanation:

The percentage error is calculated by the following formula;

[tex]Percentage \ error = \dfrac{Approximate - Exact }{Exact}[/tex]

The given parameters are;

The atomic mass of cobalt = 58.933 amu. =  The exact value

The mass of cobalt as measured by the scientist = 57.514 = The approximate value

Therefore, the percentage error is given plugging in the values into the above equation for percentage error as follows;

[tex]Percentage \ error = \dfrac{(57.514- 58.933 )}{58.933 } \times 100 = -2.41\%[/tex]

The percentage error = -2.4 %.

Answer:

1.  Chloro(methylchloranuidyl)methane

2.   1-Chloro-3,3-dimethylbutane

3.  2-bromobutane

Answer: Fl

Explanation:

If you go onto the periodic table, you find the element that has the atomic number 114. It is located in period 7 and Group 14.

Answer:

[tex]\huge \boxed{\mathrm{Fl}}[/tex]

Explanation:

In the periodic table, the element with an atomic number of [tex]\sf 114[/tex] is Flerovium.

The symbol for the element Flerovium is [tex]\sf Fl[/tex] .

Answer:

ch4 + 2o2 gives co2+2h2o +891kj

Explanation:

becoz 891kj heat energy is given out

exothermic process means heat energy is given out/ released

Among the given reactions the exothermic reaction is option a. The reaction between methane and oxygen giving out carbon dioxide and water with 891 KJ of heat energy.

An exothermic reaction is the reaction in which heat is evolved from the reaction system to the surroundings. The reaction container will be too hot to touch.

The enthalpy change for an exothermic reaction is negative. Whereas that for an endothermic reaction is positive where, heat is absorbed into the reaction system.

For the given reactions, all other reactions except option a are intaking some heat energy that's why written in the left side of arrow which are endothermic. Option a is the combustion of methane gas and it is exothermic.

To find more on exothermic reactions, refer here:

https://brainly.com/question/10373907

#SPJ5

Answer: True

Explanation:

Mendeleevs periodic classification is based on the atomic masses of the elements.