Which sentence is a scientific statement?
A. The sun is constantly emitting undetectable waves.
B. Instrumental music sounds better than choral music.
C. Studying science is more important than studying art.
D. Pure water is better than sugar water for plant growth.
Answer:d
Explanation:
obv
An Element X has been discovered. Element X forms an Xt ion and
G9 EOT3 2020-
has an atomic number of 11. The X* ion of Element X forms a bond
with CI.
1-3
5.00
11
Na
Mg
3
22.99
19
24.10
20
21
K
Ca
Sc
19.10
400
19
Rb
Sr
Y
NOT
R$ 47
53
N7
so
CS
Ba
3.71
112.91
117 11
Ra
malleable and co
malene bi
Answer: The chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
Explanation:
An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).
The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.
Element X has the atomic number 11 which is sodium. The electronic configuration of it is [tex]1s^22s^22p^63s^1[/tex]
This element will lose 1 electron to form [tex]X^+[/tex] ion of [tex]Na^+[/tex]
Chlorine has the atomic number 17. The electronic configuration of it is [tex]1s^22s^22p^63s^23p^5[/tex]
This element will gain 1 electron to form [tex]Cl^-[/tex] ion
When these two ions combine, they lead to the formation of an ionic compound having a chemical formula of [tex]XCl[/tex] or [tex]NaCl[/tex]
Hence, the chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
If [H3O^ + ]=1.7*10^ -3 M what is the pOH of the solution?
Answer:
The pOH of the solution is 11.23.
Explanation:
To solve this problem, we must remember the following formula for pH: pH = -log[H+].
If we plug in the value we are given, we can find the pH.
pH = -log[H+]
pH = -log(1.7*10^-3)
pH = 2.77
To find the pOH, we use the following formula:
pH + pOH = 14
To solve, we should plug in the value we found above for pH and solve for the pOH.
2.77 + pOH = 14
pOH = 11.23
Therefore, the correct answer is 11.23.
Hope this helps!
Which index fossil in sedimentary surface bedrock most likely indicates that a marine
environment once existed in the region where the sediments were deposited?
Answer:
Which index fossil in sedimentary surface bedrock most likely indicates that a marine environment once existed in the region where the sediments were deposited? The timeline below represents the entire geologic history of Earth. The lettered dots on the timeline represent events in Earth's history.
Explanation:
Plz mark me as a brainlist
Loud speaker A vibrates 200 times each second. Loud speaker B vibrates 400 times each second.a)What is the frequency of the sound produced by Loud speaker A ? Give the value and unit.
b)Which loudspeaker produces higher frequency of vibrations?
(Show calculations)
Answer:
For a: The frequency produced by loudspeaker A is 200 Hz
For b: Loudspeaker B produces a higher frequency of vibrations.
Explanation:
To calculate the frequency of a loudspeaker, we use the formula:
[tex]\nu=\frac{\text{Number of vibrations}}{\text{Time period}}[/tex] ......(1)
where,
[tex]\nu[/tex] = frequency
For loudspeaker A:Number of vibrations = 200
Time period = 1 second
Putting values in equation 1:
[tex]\nu_A=\frac{200}{1s}=200Hz[/tex]
For loudspeaker B:Number of vibrations = 400
Time period = 1 second
Putting values in equation 1:
[tex]\nu_B=\frac{400}{1s}=400Hz[/tex]
Hence, the frequency produced by loudspeaker A is 200 Hz and loudspeaker B produces a higher frequency of vibrations.
Please help with this question
What of Newton's three laws apply?
Answer:
when u press the brakes
Explanation:
the newton third law of motion is applied on tyres
Answer:
NEWTONS SECOND LAW,
both vehicles have the same speed, but the truck has a larger mass than the car,
so according to F=mass× acceleration
the truck driver has to apply much force than the car driver
The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house?
Answer:
c
Explanation:
Answer:
B: They must be cooler than the air inside the house.
Explanation:
I got it right on edge!
N is another unit for mass True or False
Your friend realized that they have no more money left to pay their debts (money owed). What would you say to your friend to console them and to give them advice. Write 2 things you would say.
Answer:
to get a job and why does she not have money
Explanation:
Have a nice day :)
How many grams of ammonia (NH3) can be produced by the synthesis of excess hydrogen gas (H2) and 253.8 grams of nitrogen gas (N2) in a synthesis reaction?
Answer:
308.2 g of NH₃.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
3H₂ + N₂ —> 2NH₃
Next, we shall determine the mass of N₂ that reacted and the mass of NH₃ produced from the balanced equation. This can be obtained as follow:
Molar mass of N₂ = 2 × 14 = 28 g/mol
Mass of N₂ from the balanced equation = 1 × 28 = 28 g
Molar mass of NH₃ = 14 + (3×1)
= 14 + 3 = 17 g/mol
Mass of NH₃ from the balanced equation = 2 × 17 = 34 g
Summary:
From the balanced equation above,
28 g of N₂ reacted to produce 34 g of NH₃.
Finally, we shall determine the mass of NH₃ produced by the reaction of 253.8 g of N₂. This can be obtained as illustrated below:
From the balanced equation above,
28 g of N₂ reacted to produce 34 g of NH₃.
Therefore, 253.8 g of N₂ will react to produce = (253.8 × 34)/28 = 308.2 g of NH₃.
Thus, 308.2 g of NH₃ were obtained from the reaction.
For an ideal gas, evaluate the volume occupied by 0.3 mole of gas.
Answer:
V=0.3×22.4=6.72 liters hope this helps
A student tests a solid sample of a compound and determines that it does not conduct electric
current. When the
compound is dissolved in water, the solution does conduct electric current
What type of bonding does the compound have?
a.non polar covalent
b.ionic
c.polar covalent
d.metallic
Answer:
A
Explanation:
because they are non polar so would not conduct electricity :)
The type of bonding does the compound have non polar covalent.
What is non polar covalent?A non-polar covalent bond is just a sort of chemical bond that occurs when two atoms share electrons evenly. As a result, the count of electrons shared by neighboring atoms in an atom would be identical.
What is compound?A compound would be a material made up of two or maybe more chemical elements that have been chemically bonded together.
They still wouldn't conduct electricity even though they can non-polar.
Therefore, the correct answer will be option (A).
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How do hydrogels retain water?
Answer:
The combination of the polymer opening up and the water molecules sticking to it make a solution of the hydrogel get thicker and more viscous (sticky). Disposable nappies make use of the ability of hydrogels to take up and retain water, even under pressure.
Explanation:
Fe2O3 (s) + CO (g) -> Fe(s) + CO2 (g) (unbalanced)
1.Calculate the number of grams of CO that can react with 0.150kg of Fe2O3
2. Calculate the number of grams of Fe and the number of grams of CO2 formed
when 0.150 kg of Fe2O3 reacts
Answer:
1. 78.9g of CO
2. 104.9g Fe and 124.0g CO2
Explanation:
Based on the balanced reaction:
Fe2O3 (s) + 3CO (g) -> 2Fe(s) + 3CO2 (g)
1 mole of Fe2O3 reacts with 3 moles of CO to produce 2 moles of Fe and 3 of CO2
1. The moles of 0.150kg = 150g of Fe2O3 -Molar mass: are:
150g * (1mol / 159.69g) = 0.9393 moles Fe2O3
Moles CO:
0.9393 moles Fe2O3 * (3mol CO / 1mol Fe2O3) = 2.818 moles CO
Mass CO -Molar mass: 28.01g/mol-:
2.818 moles CO * (28.01g/mol) = 78.9g of CO
2. The moles of Fe produced are:
0.9393 moles Fe2O3 * (2mol Fe / 1mol Fe2O3) = 1.8786 moles Fe
Mass Fe -Molar mass: 55.845g/mol-:
1.8786 moles Fe * (55.845g/mol) = 104.9g Fe
The moles of CO2 produced are:
0.9393 moles Fe2O3 * (3mol CO2 / 1mol Fe2O3) = 2.818moles CO2
Mass CO2 -Molar mass: 44.01g/mol-:
2.818moles CO2 * (44.01g/mol) = 124.0g CO2
describe how water molecules can hydrate various substances
Answer:
Water molecules forming hydration shells around Na+ and Cl- ions. The partially positive ends of the water molecules are attracted to the negative Cl- ion, while the partially negative ends of the water molecules are attracted to the positive Na+ ion.
Explanation:
I got this from another source, I hope this helps tho!
which structural formula represents an unsaturated hydrocarbon?
Answer:
4
Explanation:
your chosen answer is right as unsaturated mean contains double bond and 1st and 3rd is Wrong as Carbon only can have 4 bonds and 2nd is Wrong as it is saturated.
hope this helps :)
How many liters of water is needed to make .340 M using 6.4 moles of Cu(OH)2?
Answer:
here, i think this helps
https://www.crestwoodschools.org/userfiles/867/Classes/9260/Moles%20Worksheet.pdf
Does a reaction involving an acid and a base have to take place in a water environment? Justify your answer.
Answer:
Yes, because the water solvent is better
Explanation:
Hope this helps
Which of the following salts are soluble in water? I. ammonium carbonate II.
barium sulphate III. lead nitrate
O I, II and I
Il and Ill only
O I and III only
O I and II only
Answer:
I and III only
Explanation:
Ammonium carbonate is soluble in water
Barium sulphate is not soluble in water
Lead nitrate is soluble in water
pls check for me !! thank you.
Answer:
52 mL of H₂O.
Explanation:
The balanced equation for the reaction is given below:
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 mL of H₂ reacted with 1 mL of O₂ to produce 2 mL of H₂O.
Finally, we shall determine the volume of H₂O that will be produced by the reaction of 52 mL of H₂ at the same temperature and pressure.
This can be obtained as follow:
From the balanced equation above,
2 mL of H₂ reacted to produce 2 mL of H₂O.
Therefore, 52 mL of H₂ will also react to produce 52 mL of H₂O.
Thus, 52 mL of H₂O were obtained from the reaction.
What volume will 106.476 g N, gas at STP occupy?
O 85.1808L
O 170.362L
O 7.60543L
0 3.80271L
Answer:
170.362 L
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesGas Laws
STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify variables
[Given] 106.476 g N
[Solve] L N
Step 2: Identify Conversions
[STP] 1 mol = 22.4 L
[PT] Molar Mass of N: 14.01 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 106.476 \ g \ N(\frac{1 \ mol \ N}{14.01 \ g \ N})(\frac{22.4 \ L \ N}{1 \ mol \ N})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 170.24 \ L \ N[/tex]Elvis eats a peanut butter sandwich for lunch. Peanut butter contains a lot of protein, and bread is mostly starch. Elvis plans to go for a run later this afternoon. He is breathing normally. What does he need from the food he ate and the air he breathes so that he can go on his run? How do Elvis' body systems work together to get the molecules he needs into his cells? How do his cells use these molecules to release energy for his body to run?
Answer:
hi
Explanation:
Urgent: Suppose that 14.9 mL of HNO3 is neutralized by 53.1 mL of a 0.0048 M solution of KOH in a titration. Calculate the concentration of the HNO3 solution.
Answer:
0.017 M
Explanation:
The reaction that takes place is:
HNO₃ + KOH → KNO₃ + H₂OFirst we calculate how many KOH moles reacted, using the given volume and concentration:
53.1 mL * 0.0048 M = 0.255 mmolAs 1 mmol of KOH reacts completely with 1 mmol of HNO₃, in 14.9 mL of the HNO₃ solution there were 0.255 HNO₃ mmoles.
With that in mind we can calculate the concentration of the HNO₃ solution using the calculated number of moles and given volume:
0.255 mmol / 14.9 mL = 0.017 MWhat is the oxidation state of each element in the compound CaSO4?
⚠️⚠️Plz Help⚠️⚠️
What information does the half-life of a radioisotope give?
A. It tells what kind of radiation is being given off by the radioactive material.
B. It tells what fraction of radioisotope is present after each half-life has passed.
C. It tells how much energy the radioactive material is generating at a point in time
D. It tells how long it takes for a radioactive isotope to become a daughter element.
Answer:
D. It tells how long it takes for a radioactive isotope to become a daughter element
Explanation:
The other answer was wrong
Option B. It describes what fraction of radioisotope exists present after each half-life has passed is the information does the half-life of a radioisotope give.
What is radioisotope?Radioisotopes exist as radioactive isotopes of an element. They can also be described as atoms that contain an unstable assortment of neutrons and protons, or surplus energy in their nucleus.
A radionuclide exists as a nuclide that has surplus nuclear energy, creating it unstable. This excess energy can be utilized in one of three methods: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a transformation electron; or used to produce and emit a new particle from the nucleus.
Radioactive half-life exists the time needed for a quantity of a radioisotope to decay by half. If the half-life of an isotope exists relatively short, e.g. a few hours, most of the radioactivity will be gone in a rare day.
Hence, Option B. It describes what fraction of radioisotope exists present after each half-life has passed is the information does the half-life of a radioisotope give.
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A cup of coffee has 71 mL of coffee and 127 mL of water. What is the percent volume of the coffee solution?
Answer:
35.9%
Explanation:
The percent volume of the coffee solution can be calculated as follows:
% volume of coffee solution = volume of coffee/total volume of coffee solution × 100
According to this question, a cup of coffee has 71 mL of coffee and 127 mL of water. This means that, the total volume of coffee solution is;
71mL + 127mL = 198mL
% volume = 71/198 × 100
= 0.359 × 100
Percent volume of coffee solution = 35.9%
A reducing agent is a substance that brings about reduction by becoming oxidized and donating electrons to another species. In the following reduction reaction, what is the reducing agent?
Cu2+ + 2 Li → Cu + 2Li+
a.Cu2+
b.Li
c.Cu
d.e-
Answer:
b. Li
Explanation:
A reducing agent is a substance in a redox reaction that reduces another substance, but gets oxidized itself. It becomes oxidized by donating electrons to another substance, which accepts it and gets reduced.
According to the given equation in this question:
Cu2+ + 2 Li → Cu + 2Li+
In the above equation, lithium (Li) which was at an oxidation state of O in the reactant side has become oxidized in the product side i.e. Li → Li+. This means that lithium is the reducing agent.
Write a balanced equation state the reaction type, and perform the requested stoichiometry: Carbon and hydrogen combine to form
methane. How many grams of carbon would be needed to react with 30.2 grams of hydrogen?
Answer:
C + 2H2 = CH4
Given 30.2g of H2
Find the Moles
Mole =Mass/Molar Mass
Molar Mass of H2 = 1x2 = 2g/mol
Mole = 30.2/2
= 15.1moles of Hydrogen gas.
Now from the balanced equation of Reaction above...
1mole of Carbon reacts completely with 2moles of Hydrogen gas.
"x" moles of carbon with react with 15.1moles of Hydrogen
x = 15.1/2
=7.55moles of carbon.
We now have moles of carbon.
To find mass
Mole =Mass/Molar Mass
Mass = Mole x Molar Mass
Molar mass of carbon = 12g/mol
Mass = 7.55 x 12
Mass = 90.6g of carbon is needed.
Which element has their valence electron farthest from the nucleus?
K (Potassium)
Li (Lithium)
Na (Sodium)
Rb (Rubidium)
When a fuel is burned, any carbon that does not undergo combustion can be released as particles. What do we call this product?
Answer:
"soot" or "smoke" or "particulates" or "ash" or "carbon particulates"
Explanation:
The carbon that does not undergo combustion is released as particles. This particles are called soot or dust. Incomplete combustion also leads to the production carbon monoxide.
What is combustion ?Combustion is an exothermic process in which a gas reacts with the atmospheric oxygen producing carbon dioxide and water. This reaction involves heat to the surroundings.
Sometimes the combustion does not occurs completely. When there is insufficient oxygen for the fuel to completely react with the air to form carbon dioxide and water leads to incomplete combustion. It also occurs when a heat sink, such a solid surface or flame trap, extinguishes the combustion.
One of the byproducts of incomplete combustion is carbon monoxide. The typical incomplete combustion process releases carbon, which results in the formation of soot and dust.
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