Answer:
If you begin a reaction with 300 grams of reactants, how many grams of products should exist after the reaction?
Explanation:
When a lithium atom becomes ionized its new electron configuration is 4 points
the same as which element?
A. Ar
B. Mg
C. He
D. Fe
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.
HELP PLS , CHEMISTRY
Answer:
N2H4
Explanation:
Find the mass of the empirical formula, which is 16.03 Take the formula mass and divide it by the empirical mass. This should give you an answer of 2 (well, 1.99 but it is close enough to a whole number to where you can just use 2). Multiply the subscripts of NH2. N has a subscript of 1, so now it will have a subscript of 2. H has a subscript of 2, so it will now have a subscript of 4. Therefore, your answer is N2H4.Present Your Findings
1. Make a graph of the data collected.
a. Label the x-axis as time.
b. Label the y-axis as the number of undecayed atoms.
c. Be sure to title the graph.
d. Turn the graph into your teacher.
2. Write a summary paragraph discussing this experiment and the results. Use the following questions to help guide the
content of your paragraph.
a. What was your hypothesis? According to your data, do you think your hypothesis was correct?
b. What is a half-life?
c. When does a radioactive sample emit the largest number of decay particles? Why is this information important?
(How can it be applied in our world today?)
d. Do you think the shape of the curve on your graph would change if you increased the half-life to 20 seconds?
What does this reveal about radioactive decay?
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)? What does this reveal about radioactive decay?
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
What would happen if we couldn't carry respiration out?
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.
A photographic "stop bath" contains 160ml of pure acetic acid, HC2H302(1) in 650ml solution. what is the v/v concentration of acetic acid in the stop bath?
PLEASE EXPLAIN IT STEP BY STEP
Answer:
discupaeu não sei
um belo dia abençoado
Resistance depends on which three properties of a wire?
Color and texture are not directly related to a wire’s resistance.
color, thickness, texture
thickness, length, temperature
length, texture, temperature
temperature, color, texture
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.
What is resistance of a wire?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;
L is length of the wireA is area of the wire (thickness)ρ is resistivity of the wire (depends on temperature)Thus, the resistance of a wire depends on the following three properties of a wire, thickness, length, temperature.
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A snail takes 36 minutes to cross a highway. How many minutes would it take the snail to cross the same highway 7 times?
Answer:
252
Explanation:
7(36) = 252
How many grams of sodium bicarbonate are in 1.8 x 1023 formula units?NaHCO3
anyone faaaaast please:(((((((((
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
The plant on the left is growing more because it has been receiving more water
Answer:
uhhh well ig btw what plant
Explanation:
it would be more sunlight to
ANYONE PLEASE!!! MORE HELP ON THIS!!! all you have to do is say if it is ionic, binary, covalent or an acid. remember i give all my points to whoever is the most helpful!!!
11. N2S
12. SeF2
13. AsCl3
14. HClO
15. Be(OH)2
16. SO3
17. KMnO4
18. HClO4
19. Cu2S
20. BF3
21. H2SO4
22. CaI2
23. Pb3(PO4)2
24. HCH3COO
25. Ca(CH3COO)2
26. P2O5
27. BaCl2
28. K2SO4
29. Pb(ClO3)2
30. H3PO4
Answer:
21 is ionic aicid only one 1 know
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Which of the following is a substance?
A. air
B. alloy
C. soil
D. seawater
E. carbon
Answer:
D
Explanation:
hope this helps
Can someone answer???I’ll give brainlist and points?!??
Answer:
yes i can anwser
Explanation:
Scalar quantities include what 2 things?
A. Number and direction
B. Size and direction
C. Numbers and units
D. Units and directions
Answer:
D
Explanation:
Units and directions
Molar mass
Please give me the answers and explain
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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POSS
Explain when gold is considered an element and when it is considered a solution.
Answer:
Gold is an element even when it is in a solution
How many atoms of oxygen (O) are represented in the chemical formula shown below?
2 CO2
4 atoms of oxygen
O 2 atoms of oxygen
1 atom of oxygen
6 atoms of oxygen
Answer:
4 atoms of oxygen
Explanation:
Using just the valence electrons on each atom determine which 2 atoms should be in the same group?
atoms 1 and 2
atoms 3 and 4
atoms 2 and 3
O atoms 1 and 4
Answer:
Explanation:
Atom 1 and 4 because they have the same number of valence elctrons in its outermost shell
6. Calculate the mass of an object that has a density of 19.3 g/mL and a volume of 100. mL. (Show Your Work)
7. Calculate the volume of an object that has a density of 7.8 g/mL and a mass of 500. G. (Show Your Work)
Answer:
6. mass=1930g
7.64.10ml
Explanation:
6. mass=density time volume
7.volume=mass divide by density
A cylinder at left with balls evenly spaced throughout the cylinder with an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.
Which change of state is shown in the model?
condensation
deposition
boiling
freezing
Answer:
deposition
Explanation:
Answer:
B
Explanation:
How do core electrons relate to the ionization energy of the atom?
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 :)
Question 1 (2 points)
The higher the frequency of a wave, the lower the energy.
True
False
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
How many grams of sugar must be dissolved in 150 ML of water to make a solution that has a concern traction of .6 g/ml
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!
Which of the following molecules is not an exception of octet rule? *
(a) BF₃
(b) PF₅
(c) CO₂
(d) IF₇
What would you observe when zinc is added to a dilute hydrochloric acid? Write the chemical reaction that takes place?
NEED HELP PLZ FAST
.
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.
Which reason explains why gas bubbles are released when a carbonated beverage is opened?
What is characteristic of an ionic bond?
Solomon wants energy on a sound wave to be carried more quickly through a metal medium. Which could he do? A. Decrease the temperature. B. Increase the temperature. C. Use a gas medium instead. D. Use a liquid medium instead
Answer:
B. increase the temperature
Explanation:
increasing the temperature results in energy being carried more quicklyWhich compounds are organic?
Answer:
NaCI
Explanation:
50 Points! Will Mark Brainliest!
How do you find the mass in grams of one formula unit of a compound given all the atomic masses of every element in the compound?
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: