Compare these examples of matter. Which of these is a pure substance and why? A Milk, because every portion of the matter is the same, and its components can only be separated chemically. B Coffee, because every portion of the matter is the same, and its components can only be separated chemically. C Salt water, because every portion of the matter is the same, and its components can only be separated chemically. D Carbon dioxide, because every portion of the matter is the same, and its components can only be separated chemically.

Answer:

6. mass=1930g

7.64.10ml

Explanation:

6. mass=density time volume

7.volume=mass divide by density

Answer:

NaCI

Explanation:

Answer:

4 atoms of oxygen

Explanation:

Answer:

1) Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)

You would see the reaction forming bubbles vigorously. Hydrogen gas is produced in the process.

Explanation:

The molar mass of a substance is the mass in grams of one mole of the substance. In a compound, add the atomic masses of the components.

 HCl

 Atomic mass of H  = 1g/mol,  Cl = 35.5g/mol

   HCl  = (1 + 35.5) = 36.5g/mol

 ZnF₂

Atomic mass of Zn  = 65.4g/mol, F = 19g/mol

      ZnF₂  = 65.4 + 2(19) = 103.4g/mol

 K₂CO₃

   Atomic mass of K = 39, C  = 12, O = 16

    K₂CO₃  = 2(39) + 12 + 3(16)  = 138g/mol

 FePO₄

Atomic mass of Fe = 55.8, P = 31, 0 = 16

 FePO₄ = 55.8 + 31 + 4(16) = 150.8g/mol

Cu₂S

  Atomic mass of Cu = 63.5g/mol, S = 32

    Cu₂S = 2(63.5) + 32 = 159g/mol

Each term in the series represents a sinusoidal component with a frequency of (kπ/4) and an amplitude of 4.

To express the given periodic signal x(t) in the form x(t) = ∑[k=0 to infinity] A_k cos(w_kt + ϕ_k),\

we can use the formula for the Fourier series representation of a periodic signal.

1. First, let's find the values of A_k, w_k, and ϕ_k using the given Fourier series coefficients.

The given coefficients are:

a_1 = a_-1* = j

a_5 = a_-5 = 2

Since x(t) is real-valued, the coefficients for negative frequencies (a_-k) are the complex conjugates of the coefficients for positive frequencies (a_k).

From the given coefficients, we can determine the values of A_k:

A_1 = a_1 + a_-1 = j + conj(j) = j - j = 0

A_5 = a_5 + a_-5 = 2 + conj(2) = 2 + 2 = 4

Since the fundamental period T is 8, the fundamental frequency is ω_0 = 2π/T = 2π/8 = π/4.

The values of w_k can be determined as:

w_0 = 0

w_k = k * w_0 = k * (π/4) for k ≠ 0

The values of ϕ_k can be determined as:

ϕ_0 = 0

ϕ_k = arg(a_k) for k ≠ 0

2. Now, let's express x(t) in the desired form using the determined values.

x(t) = A_0 cos(w_0t + ϕ_0) + ∑[k=1 to infinity] A_k cos(w_kt + ϕ_k)

Substituting the values we found:

x(t) = 0 cos(0t + 0) + ∑[k=1 to infinity] 4 cos((kπ/4)t + arg(a_k))

Simplifying:

x(t) = ∑[k=1 to infinity] 4 cos((kπ/4)t + arg(a_k))

This is the expression of x(t) in the desired form.

Remember that the series is infinite, so it includes all integer values of k.

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Answer:

C. He

Explanation:

When lithium is ionized, its new electronic configuration is the same as that of a helium atom.

 Lithium is made up of 3 electrons with a configuration of:

                     2, 1

it has 1 electron in its outermost shell.

As a metal lithium will prefer to lose an electron due to its electropositivity.

    On losing an electron, it will have 2 electrons remaining

Now, Helium has 2 electrons and this makes it similar to Lithium that has lost one electron.

This makes Lithium isoelectronic with Helium.  

Answer: To your project!!

Experiment Half-Life

a. My hypothesis is that when we get through 6 half-life’s you will be left with no atoms, and each time the atom number will decrease. Half of my hypothesis was correct whilst the numbers did decrease we, after 6 trials were left with one undecayed atom.

b.what is a half life?

the time required for the decay of one-half of the atoms in a sample of radioactive material

c. When does a radioactive sample emit the largest number of decay particles? when it first starts to decay

Why is this information important? Half-Life and decay is important today because it helps us determine the date of death and birth of ancient mummies.

d. Do you think the shape of the curve on your graph would change if you increased the half-life to 20 seconds? Yes different data would arise and that would change the graph.

What does this reveal about radioactive decay? The longer a material or substance takes to decay the larger the amount of decayed material or substance will come from the substance

e. Do you think the shape of the curve on your graph would change if you started with a smaller sample, say 50 atoms (pennies)? Yes, again different data would arise and that would change the graph.

What does this reveal about radioactive decay? The smaller the sample the quicker it will decay. And the less product that comes from the sample.

Your project is done, it worked for me hope it does for you? DON'T USE THE EXACT SAME WORDS IT'S SUS

here is the graph too!

Answer:

Hey I dont know if you got the same project as me but I had to record pennies and make a graph so I recorded pennys here

Explanation:

first half-life =  tails 49 : heads 51

second half-life = tails 19 : heads 29

third half-life = tails 8 ; heads 11

fourth half-life = tails 2 ; heads 6

fifth half-life = tails 1 ; heads 1

sixth half-life = I didnt know what to say so I put 1

hope this helps someone

Answer:

There would be no energy for cellular activities

Explanation:

Cellular respiration is the process whereby living organisms breakdown ingested food in their cells in order to obtain energy in form of ATP. In other words, respiration converts the stores energy in food molecules into usable energy by the cell. The general equation of the process is as follows:

C6H12O6 + 6O2 → 6CO2 + 6H2O

The process of cellular respiration is carried out by every living organism in order to obtain energy to perform their various metabolic activities. Hence, without RESPIRATION, there would be no energy (ATP) for use by the cell, which utterly means no cellular activities will take place.

Answer:

Gold is an element even when it is in a solution

Answer:

For any given element, ionization energy increases as subsequent electrons are removed. For example, the energy required to remove an electron from neutral chlorine is 1251 kJ/mol. ... An even sharper increase in ionization energy is witnessed when inner-shell, or core, electrons are removed.

Hope it helps :)

Answer:

Thickness, length, and temperature

Explanation:

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional. A thicker wire simply has more 'lanes' on the go at once. A higher current for a given voltage means a lower resistance. The thicker wire has a lower resistance than the thinner wire does. The resistance of a wire decreases with increasing thickness. The resistance of a metal conductor is due to collisions between the free electrons of the electric current and the metal ions of the wire. If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously. The resistance of an NTC thermistor decreases with increasing temperature.

The resistance of a wire depends on the following three properties of a wire, thickness, length, temperature.

The resistance of a wire is the opposition to the flow of current offered by the wire.

The resistance of a wire depends on the flowing;

R = ρL/A

where;

Thus, the resistance of a wire depends on the following three properties of a wire, thickness, length, temperature.

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Answer:

uhhh well ig btw what plant

Explanation:

it would be more sunlight to

Answer:

Explanation:

Atom 1 and 4 because they have the same number of valence elctrons in its outermost shell

Answer:

Explanation:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D).  The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.  (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)

Answer:

The characteristic molar mass of an element is simply the atomic mass in g/mol. However, molar mass can also be calculated by multiplying the atomic mass in amu by the molar mass constant (1 g/mol). To calculate the molar mass of a compound with multiple atoms, sum all the atomic mass of the constituent atoms.

Explanation:

Answer:

B. increase the temperature

Explanation:

Answer:

N2H4

Explanation:

Answer:

yes i can anwser

Explanation:

Hey there!:

Density = 0.6 g/mL

Volume = 150 mL

Mass = ?

therefore:

D = m / V

0.6 = m / 150

m = 0.6 x 150

m = 90.0 g of sugar

Hope this helps!

Answer:

Mass = 25.2 g

Explanation:

Given data:

Number of formula units of NaHCO₃ = 1.8×10²³

Mass in gram = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ formula unit

1.8×10²³formula unit × 1mol  /  6.022 × 10²³ formula unit

0.3 mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.3 mol × 84 g/mol

Mass = 25.2 g

Answer:

D

Explanation:

Units and directions

Answer:

D

Explanation:

hope this helps

Answer:

False

Explanation:

There is a direct relationship between wave frequency and energy...

The higher the frequency, the higher the energy

alternatively, the lower the frequency, the lower the energy

Answer:

discupaeu não sei

um belo dia abençoado

Answer:

252

Explanation:

7(36) = 252

Answer:

21 is ionic aicid only one 1 know

Answer:

deposition

Explanation:

Answer:

B

Explanation: