The model of a neutral element is shown below. Which particle determines the reactivity of the element?


A
B
C
D
​

Answer:

Identify the variables and constants in your experiment. In a controlled experi- ment, a is any factor that can change. Constants are all of the factors that are the same in both the experimental group and the control group.

Answer:

metal salts, and carbon dioxide

Explanation:

Answer: no

Explanation: they tell the organs what to sense.  

Answer:

22.8 mmHg

Explanation:

According to Dalton's law of partial pressures, the total pressure of a mixture of gases is obtained as the sum of the partial pressures if all the individual gases present in the mixture.

Since the total pressure of gases in the mixture is 0.998 atm, the partial pressure of carbon dioxide is;

PCO2 = [Ptotal - (PO2+ PN2)]

Hence;

PCO2 = [0.998 - (0.198 + 0.770)]

PCO2 = 0.03

Since

1 atm = 760 mmHg

0.03 atm = 0.03 × 760 /1

=22.8 mmHg

Answer:

0.067 ton/Litre.

Explanation:

645 Newtons per quart to tons per liter.

We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:

1 N/q = 100 g/q

Therefore,

645 N/q = 645 N/q × 100 g/q / 1 N/q

645 N/q = 64500 g/q

Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.

Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:

454 g/q = 1 pound/q

Therefore,

64500 g/q = 64500 g/q × 1 p/q / 454 g/p

64500 gram/quart = 142.07 pound/quart

Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.

Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:

2000 p/q = 1 ton/q

Therefore,

142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q

142.07 pound/quart = 0.071 ton/quart

Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.

Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:

1 ton/q = 1/1.06 ton/L

Therefore,

0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q

0.071 ton/quart = 0.067 ton/Litre

Therefore, 0.071 ton/quart is 0.067 ton/Litre.

From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.

Answer:

E = 45.08×10⁻¹⁹j

Explanation:

Given data:

Energy of photon  in joule = ?

Frequency of photon = 6.8×10¹⁵ Hz

Solution:

Formula:

E = h.f

f = frequency

h = planck's constant (6.63×10⁻³⁴Js)

E = energy

Value of planck's constant is 6.63×10⁻³⁴Js.

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵  Hz

Hz = s⁻¹

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵  s⁻¹

E = 45.08×10⁻¹⁹j

Energy is the quantitative unit, which is measured in joules. The energy of a photon of UV light having the frequency  6.8×10¹⁵ Hz is 45.08×10⁻¹⁹ Joules.

Given:

Frequency of photon = 6.8×10¹⁵ Hz

Energy of a photon in joule =?

Usingt the formula of energy:

E = h x v

where,

v = frequency

h = planck's constant (6.63×10⁻³⁴Js)

E = energy

Substituting the values in the equation, we get:

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹

E = 45.08×10⁻¹⁹ Joules

Therefore, the energy of a photon in the UV region is 45.08×10⁻¹⁹ Joules

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Answer:

that's so easy but if you still need the answer i am willing to help

Explanation:

Answer:

D is your Answer just did the  quiz

( date on bottom when I did the quiz)

Explanation:

3 - 24 - 2021

Answer:

It's the elements atomic mass and the number of neutrons and protons in an atom.

Explanation:

Answer:

They were formed right after the "Big Bang" when our known universe originated from pure energy some billions of years ago. The energy was converted to the elementary particles (quarks, gluons, leptons etc...) from which protons and neutrons were formed. From these, atoms of different elements were produced

Answer:

D hope this helps

Explanation:

Answer:

d. what will happen to the freezing point of the water if salt is added?

Answer:

Various compounds made of different forces between molecules

Explanation:

In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter in order to effect a measurable response.

According to this question, a student compares the boiling point of substances having different intermolecular forces. This means that the student uses different substances with different intermolecular forces and measures the boiling point of each, which depends on the intermolecular forced in them. Hence, the independent variable in this experiment is the VARIOUS COMPOUNDS MADE OF DIFFERENT FORCES BETWEEN MOLECULES.

Explanation:

Monaotomic:- the elements that have only one atom in molecule are called monaotomic elements. they are stable. Example:-Ne,Ar all are noble gases

Diatomic:-the elements that have two atoms are called diatomic molecules. Example:- Oxygen

Triatomic:-the elments that have three atoms are called tri-atomic elements they are unstable. Ex.ozone

Compounds are made of the various elemental atoms joined together. Water and salt are compounds that can be present in their pure form. Thus, option A is false.

A compound is a substance formed by the bond between the atoms of the elements that shares, transfers, donates, or gains electrons to join and interlink chemically.

The pure substance is characterized by the presence of only a single type atom of the element. They have invariability and can exist in various phases with constant composition.

Water and salt are compounds made of two or more atoms of different elements that have specific physical properties and distinct chemical properties.

Therefore, option A. the compounds cannot be pure substances is false.

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Explanation:

(1) heavier materials sink to the bottom of the mixture

(2)use a filter funnel and filter paper (filtration method)

(3) ferromagnetic materials (typically metals)

Answer:

b. share electrons

Explanation:

Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere

Answer:

- Failed internal wiring

- reaching a hard to get metal item

- keeping a item on a metal surface

Explanation:

Please give me BRAINLIEST :))

Answer:

12.02 g

Explanation:

From the question given above, the following data were obtained:

Half life (t½) = 2 days

Original amount (N₀) = 96 g

Time (t) = 6 days

Amount remaining (N) =..?

Next, we shall determine the rate of disintegration of the isotope. This can be obtained as follow:

Half life (t½) = 2 days

Decay constant (K) =?

K = 0.693 / t½

K = 0.693 / 2

K = 0.3465 /day

Therefore, the rate of disintegration of the isotope is 0.3465 /day.

Finally, we shall determine the amount of the isotope remaining after 6 days as follow:

Original amount (N₀) = 96 g

Time (t) = 6 days

Decay constant (K) = 0.3465 /day.

Amount remaining (N) =.?

Log (N₀/N) = kt / 2.303

Log (96/N) = (0.3465 × 6) / 2.303

Log (96/N) = 2.079/2.303

Log (96/N) = 0.9027

Take the anti log of 0.9027

96/N = anti log (0.9027)

96/N = 7.99

Cross multiply

96 = N × 7.99

Divide both side by 7.99

N = 96 /7.99

N = 12.02 g

Therefore, the amount of the isotope remaining after 6 days is 12.02 g

Answer:

Alkaline Earth Metals

Explanation:

:)

1st and 4th options are suitable answers, as these 2 changes are not exactly physical changes as it cant return back to original form and as well as its not cooling, so I feel its 1st and 4th options

Answer:

A and D

Explanation:

It might seem like B and D but I took the test and it's A and D.

Answer:

Whether the particles of the solute and solvent are charged

Temperatures of the solvent and solute

Explanation:

A. Whether the particles of the solute and solvent are charged

B. Pressure acting and solute

C. Length of time spent stirring

D. Temperatures of the solvent and solute

Answer:

Explanation:

Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. ... A property closely related to an atom's mass number is its atomic mass.

Answer:

320 ml

Explanation:

Answer:

frequency

Explanation:

The number of wavelengths that pass through a fixed point in a second is called the frequency of the wave. It has the unit of Hertz. Hence, option C is correct.

The term that refers to the number of wavelengths that pass a fixed point in a second is frequency.

Frequency is a fundamental concept in wave motion and is defined as the number of complete cycles of a wave that occur per unit time. For example, the frequency of a sound wave is measured in hertz (Hz) and is equal to the number of sound wave cycles that occur per second.

The higher the frequency of a wave, the more cycles occur in a given period of time. Wavelength, on the other hand, refers to the distance between two adjacent points on a wave that are in phase with each other, such as the distance between two crests or two troughs.

Wavelength and frequency are related, and the frequency of a wave is inversely proportional to its wavelength. As the frequency of a wave increases, its wavelength decreases.

Amplitude refers to the maximum displacement of a wave from its equilibrium position, while compression is a region in a longitudinal wave where the particles are close together. Hence, option C is correct.

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Answer:

c

Explanation:

metals are good conductors, while non metals are not good conductors