Can someone answer???I’ll give brainlist and points?!??
Answer:
yes i can anwser
Explanation:
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 quicklyHELP!!!! ASAP!!!!
Complete the following sentences. Energy is required to _______ bonds in a molecule and released when bonds are _______.
Answer:
create and destroyed
Explanation:
its just simple science
Answer:
Create bonds
Broken
Explanation:
Energy is required to created bonds in a molecule and released when bonds are broken.
Energy is needed in chemical reactions to do work.
During bond dissociation, energy is released as a by product.In some cases, they energy is very useful for other processes. Also, when bonds are being formed, the attraction between chemical species stored up chemical energy.A container of nitrogen gas contains 0.55 mol at 7.0 atm and 45°C, and it has a volume of 2.0 L. What volume
will 1.20 mol of nitrogen have at 7.0 atm and 45°C?
Answer:
4.4 L
Explanation:
Given data:
Initial number of mole = 0.55 mol
Initial volume = 2.0 L
Final volume = ?
Final number of moles = 1.20 mol
Temperature and pressure = constant
Solution:
Formula:
V₁/n₁ = V₂/n₂
V₂ = V₁×n₂/n₁
V₂ = 2.0 L ×1.20 mol/ 0.55 mol
V₂ = 2.4 L.mol / 0.55 mol
V₂ = 4.4 L
The volume of the gas is 31.3 L.
Using the formula;
PV = nRT
P = pressure of the gas
V = volume of the gas
n = Number of moles of the gas
R gas constant
T = temperature
To obtain the volume;
V = nRT/P
V = 1.20 mol * 0.082 atmLmol-1K-1 * 318 K/7.0 atm
V = 31.3 L
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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.
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.
how to fix an i phone
Can anyone help me ? Tell me if it is right
Answer:
yes
Explanation:
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
Which describes a chemical property of
copper
Answer:
Atomic number 29
Atomic mass 63.546 g.mol -1
Electronegativity according to Pauling 1.9
Density 8.9 g.cm-3 at 20°C
Melting point 1083 °C
Copper has a melting point of 1083.4 +/- 0.2°C, boiling point of 2567°C, specific gravity of 8.96 (20°C), with a valence of 1 or 2. Copper is reddish colored and takes a bright metallic luster. It is malleable, ductile, and a good conductor of electricity and heat.
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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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.
Explain how the densities of each layer of the Earth are different.
Answer:
The atmosphere and Earth's interior are layered by density. ... Earth's core, at its center, is denser than its crust. The lowest layer of the atmosphere is denser than the upper layer. Earth's liquid metal outer core has convection, which generates the magnetic field.
Explanation:
hope this helps!
Answer:
Gravity pulls denser materials to the center of the earth, so it is basically a sphere of wrapping paper that gets denser and denser the more you unwrap the layers. The core is the most dense, and the crust is the least dense.
Hope This Helps! :) Plz Give Brainliest!
An ionic compound is formed when:
A) an aluminum ion bonds to a calcium ion
B) a cation bonds to an
anion
C) a neutral compound gains an electron
D) at atom gains an electron
Answer:
b is the answer .............
Answer:
The asnswer is c
Explanation:
Gope it helps
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 electrons are in the outer shell of a Li +1 ion?
Answer:
3 electrons
Explanation:
That means there are 3 electrons in a lithium atom. Looking at the picture, you can see there are two electrons in shell one and only one in shell two.
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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Name the following compound: LiBr
Lithium Bromate
Lithum Bromide
Lithium Bromine
Lithium Bromite
Silver iodide powder has been used as an antiseptic and as an agent to seed clouds for rain. Silver iodide is 45.9% silver by mass. If you separate a 50.0-g sample of silver iodide into its elements, silver and iodine, how much silver would you have?
Answer:
22.95g
Explanation:
Given parameters:
Percentage by mass of silver in silver iodide = 45.9%
Mass of silver iodide given = 50g
Unknown:
Mass of silver in silver iodide = ?
Solution:
The formula of the compound is;
Silver iodide = AgI
Since the percentage by mass of silver in the compound is 45.9%;
Mass of silver = percentage by mass of silver x mass of AgI
Mass of silver = [tex]\frac{45.9}{100}[/tex] x 50 = 22.95g
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
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
20.0 grams of water decomposes into hydrogen gas and oxygen gas through electrolysis. If the percent yield is 80.0%, what mass of oxygen gas is produced?
Mass of oxygen gas produced : 14.08 g
Further explanationReaction
2H₂O(l)⇒2H₂(g)+O₂(g)
mol of H₂O (MW=18 g/mol) :
[tex]\tt \dfrac{20}{18}=1.1[/tex]
mol O₂ :
[tex]\tt \dfrac{1}{2}\times 1.1=0.55[/tex]
mass O₂ (theoretical) :
[tex]\tt 0.55\times 32=17.6~g[/tex]
mass O₂ (actual) :
[tex]\tt =\%yield\times theoretical\\\\=0.8\times 17.6=14.08[/tex]
Which compounds are organic?
Answer:
NaCI
Explanation:
What mass of sulfur would you need in order to have 2.5x1021 atoms of sulfur?
Answer:
6.19⋅109ng
Explanation:
The first thing to do here is to determine the mass in grams of 2.33⋅1020 atoms of oxygen.
To do that, use Avogadro's number to convert the number of atoms to moles, the molar mass of oxygen to convert the moles to grams.
So, Avogadro's number, which acts as the definition of a mole, tells you that in order to have one mole of oxygen, you need to have 6.022⋅1023 atoms of oxygen.
In your case, the sample will be equivalent to
2.33⋅1020 atoms of O ⋅1mole O
6.022⋅1023 atoms of O =3.869⋅10−4 moles O
Now, oxygen has a molar mass of 15.9994 g mol−1 as listed in the Periodic Table of Elements
This means that your sample will have a mass of
3.869⋅10−4 moles O ⋅15.9994 g
1 mole O =6.190⋅10−3g
Finally, you can convert the mass from grams to nanograms by using the conversion factor
1 g=109ng
You will end up with
6.190⋅10−3g ⋅109ng
1g=6.19⋅106ng
meaning The answer is rounded to three sig figs.
What is characteristic of an ionic bond?
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
What is the formula for this ionic crystal?
Answer: I'm willing to help you find the formula for that ionic crystal but, I can't see anything.
The ionic crystal contains a total of 6 Ba atoms and 6 oxygen atoms. Hence they are in 1 : 1 ratio and the formula of the ionic compound is BaO.
What are ionic compounds?Ionic compounds are formed between metals and non-metals. Ionic bond is formed by the lose of electrons from the metals to the nonmetals. The chemical formula of the ionic compounds are written with the cationic symbol first.
The given ionic crystal is formed with barium and oxygen atoms. Valency of barium is 2 and that of oxygen is also 2. Thus, barium loses two electrons to oxygen forming BaO.
The given crystal lattice consists of 3 barium atoms and 3 oxygen atoms in front face and 3 Ba and 3 o in back face also. Thus, both are 6. They are in the ratio of 1 : 1. Hence, the compound is named as BaO.
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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
Which of the following molecules is not an exception of octet rule? *
(a) BF₃
(b) PF₅
(c) CO₂
(d) IF₇
the left-right inversion one word answer
Answer:
Lateral Inversion
Explanation: