Which of the following is true about waves?
A.
They are always visible.
B.
They always move matter.
C.
They carry energy.
D.
They can only travel though outer space.
Answer:
c. they carry energy is the answer
Answer:
C. they carry energy
Explanation:
Energy can be carried from one place to another by waves, including water, light, and sound waves. Waves are oscillating disturbances that travel through but do not move matter.
Infrared radiation escaping from hot coals is an example of invisible waves carrying energy. This energy can be felt as heat.
3.) All matter has both physical and chemical properties. A physical property is one that does not change the chemical nature of matter. Which of these choices is a physical property?
A.) height
B.) flammability
C.) ability to rust
D.) reaction with water
Answer:
D
Explanation:
It would be D because you are observing the reaction and don’t change anything
A baseball player makes $15,000,000/year How much do they make in dollars per minute
Answer:
$28.5388
Explanation:
First you need to find the amount of money per day by doing 15,000,000/365
Then find the amount of money per hour by doing 41095.890411/24
Finally you find the amount per minute by doing 1712.32876713/60 to get 28.5388127855.
Round if necessary
When a hammer strikes a nail, the nail
Answer:
The nail will exert a force of equal strength in the opposite direction on the first object.
Explanation:
"According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail exerts a force of equal strength in the opposite direction on the first object."
Basically, if you push someone, they will fall over right?
Still, you will feel the force as you push them over, and you might stumble back while they are pinwheeling and falling into a pool.
That force is that torque when the person's weight is also pushing back at you while your force is pushing at them.
What do the rows of the periodic table indicate?
Answer:
The rows on the periodic table are called periods. All the elements in a period have valence electrons in the same shell. The number of valence electrons increases from left to right in the period. When the shell is full, a new row is started and the process repeats.
Explanation:
hope this helps..
Warm air and water both tend to rise while cooler air and water sink. When different parts of the oceans are heated unevenly, this causes the water to
a.move in convection currents
b.form a tsunami.
c.stay in the same place.
d.mix together in the water cycle.
Answer:
a
Explanation:
Warm air and water both tend to rise while cooler air and water sink different parts of the oceans are heated unevenly, this causes the water to move in convection currents.
What is current ?A stream of charged particles, such as electrons or ions, traveling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control container is how it is calculated.
Magnetic fields are produced by electric currents and are applied in motors, generators, inductors, and transformers. They result in Joule heating in conventional conductors, which lights up incandescent light bulbs.
Electromagnetic waves produced by time-varying currents are utilized in communications to transmit information.
Thus, option A is correct.
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what is the empirical formula of a compound that has a carbon to hydrogen ratio 2-6
CH3 is the empirical formula of a compound that has a carbon to hydrogen ratio 2-6.
What is empirical formula?
The empirical formula of a chemical compound is the simplest and most basic ratio of the constituent elements present in it. It is written as the smallest whole-number ratio of the constituent elements, and does not indicate the amount or concentration of each element.
The empirical formula of a compound is the simplest whole number ratio of atoms in a molecule. In this case, the given carbon to hydrogen ratio of the compound is 2:6, which can be simplified to 1:3. This means that for every one carbon atom, there are three hydrogen atoms in the compound.
6H / 2C × 1/2 / 1/2 → 3 H / 1C
Therefore, the empirical formula of this compound is CH3.
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The image shows particles of salt dissolved in water.
How will the arrangement of salt particles most likely change?
Salt particles will move toward the left through diffusion.
Salt particles will move toward the left through active transport.
Salt particles will move toward the right through diffusion.
Salt particles will move toward the right through active transport.
Answer: Hope it may help you
Explanation:
Diffusion can be defined as the movement of particles from a region where there a more concentration of solute to the region having less concentration of the solute.
Here, the salt particles will move from right side of the box to the left side of the box.
This is because the right side has more particle and the left side has less particles so they will move towards the left side.
Answer:
A
Explanation:
(02.05 LO
Which type of heat transfer takes place through electromagnetic waves? (3 points)
RADIATION ❤️
We know that radiation is defined as he transfer of heat energy by electromagnetic radiation.
why is 99 not a prime number
Explanation:
99 is not a prime number because it can be multiplied by itself and by other numbers
99*1
9*11
Answer:
A prime number is a number that can only be divisible by ±itself and ±1
but 99 can be divisible by ±3; ±11 => 99 isnt a prime number
Explanation:
What is the correct formula that would result from the combination of the two ionic species?
if you could, also tell me why so I dont have to do this every time lol. If not that's cool too
Answer:
I think its B
Explanation:
I don't know how to explain it bc I'm not really sure
Which of these is an example of chemical separation of a substance?
-Distillation
-Magnetism
-Paper Chromatography
-Bond breaking
Answer:
Bond broking
Explanation:
Bond broking.
What would happen to the sup- ply of ATP in your cells if you did not eat enough carbohydrates? How would this affect your cells?
Answer:
ATP supply will reduced or decrease drastically
Explanation:
ATP will reduced because carbohydrates are energy given food. Chemical energy are in carbohydrates, therefore when the undergo digestion i.e breakdown of larger pieces into smaller pieces, it is broken down into glucose i.e energy is released. Therefore, if there is now carbohydrates, ATP supply will reduced and there won't be energy needed for different cellular metabolic activities. The breakdown of carbohydrate supply energy.
1. What part of the human body has the same role as the power source in a computer?
2.What part of the human body has the same role as the keyboard or the mouse on a computer?
Answer:
1. The brain
2. MOUSE / KEYBOARD = HANDS
Explanation:
1.The CPU is like the brain of the body. The CPU controls the computer and is the most important part of a computer; similar to the way the brain controls the human body and is very important. Get it?
2.Both are input devices. They are used to send in instructions and information into and out of the computer.
Hope this helps!
What element is represented in this model if the atomic number is 3?
This is science
Answer:
Lithium (Li)
Explanation:
Lithium has an atomic number of 3
Explain why the ionization energy to remove a second electron from potassium is higher than the ionization energy to remove four electrons from silicon.
Explanation:
It is more difficult to remove electrons from the second shell or energy level because of the imbalance between the positive nuclear charge and the remaining electrons.
The amount of energy required to remove electrons in ground state of an atom is the ionization energy. The first ionization energy is the energy needed to remove the most loosely bound electron of an atom in the gas phase in ground state. The second energy has a greater nuclear pull as it is closer to the nucleus. Both potassium and silicon have the same number of energy levels.how many electrons are there in 2 g of H2
Answer:
6.02 x 10²³ electrons
Explanation:
Given parameters:
Mass of H₂ = 2g
Unknown:
Number of electrons = ?
Solution:
To find the number of electrons, we must determine the number of moles of H₂ first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles = [tex]\frac{2}{2}[/tex] = 1mol
1 mole of a substance contains 6.02 x 10²³ particles
the particles can be protons, neutrons, electrons
So,
2g of H₂ will contain 6.02 x 10²³ electrons.
How many moles of Cl2 are needed in order to produce 100.0 grams of FeCl3 given the following
equation: 2 Fe + 3 Cl2 → 2 FeCl3
B
T
Answer:
0.92moles
Explanation:
Given reaction:
2Fe + 3Cl₂ → 2FeCl₃
Mass of FeCl₃ = 100g
Unknown:
Number of moles of Cl₂ needed = ?
Solution:
To solve this problem, we work from the known specie to the unknown.
From the mass of the FeCl₃ given, we can solve for the number of moles of the unknown.
Number of moles of FeCl₃;Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of FeCl₃ = 56 + 3(35.5) = 162.5g/mol
Number of moles = [tex]\frac{100}{162.5}[/tex] = 0.62mole
From the reaction expression;
2 mole of FeCl₃ is produced from 3 moles of Cl₂
0.62 mole of FeCl₃ will be produced from [tex]\frac{0.62 x 3}{2}[/tex] = 0.92mole
The number of moles of Cl₂ = 0.92moles
When 2.5 moles of N2 react according to the reaction below, how many moles of NH3 will be produced?
N2 + 3 H2 --> 2 NH3
O 2.5 moles NH3
0 2.0 moles NH3
O 1.3 moles NH3
5.0 moles NH3
Answer:
5 mol
Explanation:
by stoichiometry
nN2/1=nNH3/2
2.5=nNH3/2
nNH3=2.5×2
nNH3= 5 mol
Answer: I got 5.0 moles
Explanation:
which groups have elements with more than one positive oxidation state?
Answer:
(Ar, Xe, Rn) is the answer
According to the electronic configuration groups three to twelve have elements with more than one positive oxidation state.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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What liquid is the most vicious ?
A) water
B) skim milk
C)salt water
D) pancake syrup
How many atoms are present in a sample of Potassium (K) weighing 33.49g?
Answer:
5.158 × 10²³ atoms K
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
33.49 g K
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of K - 39.10 g/mol
Step 3: Convert
[tex]33.49 \ g \ K(\frac{1 \ mol \ K}{39.10 \ g \ K} )(\frac{6.022 \cdot 10^{23} \ atoms \ K}{1 \ mol \ K} )[/tex] = 5.15797 × 10²³ atoms K
Step 4: Check
We are given 4 sig figs. Follow sig figs and round.
5.15797 × 10²³ atoms K ≈ 5.158 × 10²³ atoms K
The density of red wine is 1.01g/cm3 and the density of olive oil is 0.92g/cm3.A salad dressing that consisted of these two ingredients was left sitting too long.The ingredients separated in the bottle ,which ingredient is which layer? Explain.
Answer:
The olive oil will be on top of the vinegar, this is because the density is more
Explanation:
since vinegar has a higher density than oil it will sink to the bottom of the bottle. subsequently oil will raise up. thus oil higher layer vinegar lower layer! :) . concentration in g/L....what u are given is 5.4g and 50ml
so first change the ml into L
50ml = 0.050L
now... 5.4g/0.050L = 108g/L
resolve in significant figures is 1.1 x 10^2 g/L
b. molarity = mol/L
L = 0.050 (calculated from above)
now we only have to convert the grams (5.4g) into mols
there are three elements in sucrose ( C = carbon, H = hydrogen
and O = oxygen)
look at the periodic table and find their molar mass (atomic weight)
Carbon = 12.0g/mol
Hydrogen = 1.00g/mol
Oxygen = 16.0g/mol
Sucrose contains 12 carbons, 22 hydrogens, and 11 oxygens
So the total molar mass of sucrose =
Carbon - 12 x 12.0 = 144
Hydrogen - 22 x 1.00 = 22
Oxygen - 11 x 16.0 = 176
Total = 144 + 22 + 176 = 342g/mol
Now u have 5.4grams of sucrose to change to mols u:
5.4 grams x 1 mol/ 342grams
in other words 5.4 grams / 342 grams leaving u with mols
= 0.0158 mols
now your concentration in molarity will be:
0.0158 mols / 0.050L = 0.32M (two significant figures)
and the unit is M which stands for mol/L
c. you are given 7M (aka mol/L)
you are given 100ml which equals 0.1L
7 mol/L x 0.1L = 0.7mol
all u have left to do is change the 0.7 mol back into grams
to do that we do the opposite of what we did in part b
in part b u took grams and changed it into mols
here we are taking mols and changing it back into grams
from part b we calculated the total molar mass = 342g/mol
so:
0.7 mol x 342 g/mol = 239.4grams
resolve into significant figures = 2 x 10^2 grams
Part A
What volume (in mL ) of a 0.150 M HNO3 solution will completely react with 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation?
In the reaction in Part A, what mass (in grams) of carbon dioxide forms?
Volume HNO₃ : 51.4 ml
Mass CO₂ : 0.17 g
Further explanationReaction
Na₂CO₃ + 2 HNO₃ ⇒ 2 NaNO₃ + CO₂ + H₂O
V Na₂CO₃ = 35.7 ml
M Na₂CO₃ = 0.108
mol Na₂CO₃ :
[tex]\tt 35.7\times 0.108=3.8556~mlmol[/tex]
mol ratio Na₂CO₃ : HNO₃ = 1 : 2
mol HNO₃ :
[tex]\tt \dfrac{2}{1}\times 3.8556=7.71~mlmol[/tex]
Volume HNO₃ :
[tex]\tt mol=n=M\times V\\\\V=\dfrac{n}{M}=\dfrac{7.71}{0.15}=51.4~ml[/tex]
mol CO₂ = mol Na₂CO₃ = 3.8556 mlmol=0.00386 mol
mass CO₂(MW=44 g/mol) :
[tex]\tt 0.00386\times 44=0.17~g[/tex]
Calculate how much Carbon Dioxide IN GRAMS needs to be absorbed to
release 500g of oxygen during photosynthesis.
Answer:
687.5 g of CO2
Explanation:
We'll begin by writing the balanced equation for photosynthesis. This is illustrated below:
6CO2 + 6H2O —> C6H12O6 + 6O2
Next, we shall determine the mass of CO2 absorbed and the mass of O2 released from the balanced equation. This is illustrated below:
Mass of CO2 = 12 + (2 × 16) = 12 + 32
= 44 g/mol
Mass of CO2 from the balanced equation = 6 × 44 = 264 g
Molar mass of O2 = 2 × 16 = 32 g/mol
Mass of O2 from the balanced equation = 6 × 32 = 192 g
Summary:
From the balanced equation above,
264 g of CO2 were absorbed to release 192 g of O2.
Finally, we shall determine the mass of CO2 absorbed to release 500 g of O2. This can be obtained as follow:
From the balanced equation above,
264 g of CO2 were absorbed to release 192 g of O2.
Therefore, Xg of CO2 will be absorbed to release 500 g of O2 i.e
Xg of CO2 = (264 × 500)/192
Xg of CO2 = 687.5 g
Thus, 687.5 g of CO2 will be absorbed to release 500 g of O2.
what is hydrophobic
Answer:
water fearing particle can be termed as HYDROPHOBICAnswer:
Hydrophobic means "scared of water" or "the fear of water."
Hydro = water
phobic = fear
You'll use this at one point in Biology class.
Please help! It would be amazing if you can!!
Answer:
3) Warm Temperatures and High pressures
Explanation:
This is the typical characteristic of southern air masses moving north
Deshawn carefully mixes the substances together in an Erlenmeyer flask. When mixed together, the substances undergo a change. Afterward, Mimi measures the mass and finds it to be 10 grams. Mimi and Deshawn repeat this experiment twice more with the same results. What is the most likely explanation for this data?
I need help with it too
property of an acide
Answer:
hi
Explanation:
acids are corrosive, rective when combined with bases form salt and when combined with metal form h2o
Answer:
page no,165 ma xa. yo question KO ans
12.
Contrast and compare:
a) ionic and covalent bonding
Answer:
Ionic bonds - an intramolecular force exist in a nonmetal and metal compounds such as NaCl. The Na donate 1 electon to Cl to complete its octet rule.
Covalent bond - an intramolecular force exist in a nonmetal and nonmetal compounds such as bonds O2, Cl2, CO2, sugar, proteins and most of organic compounds and biomolecules by sharing electrons to bond.
There are two types of covalent bonds: polar and nonpolar. Polar bond is a bond between two different nonmetal atoms of different electronegativities. While nonpolar bond is a bond between the same atom or two differenct atoms of the same electronegativities (if there is). Their electronegativities pull will cancel so that their overall polarity is zero.