Please help fast it's timed!
The subscripts in any molecular compound determine the ratio of atoms in a sample of the substance.
True
False
The energy level where an electron is located, is shown by the ______ on the periodic table
Answer:
the first energy level is closest to nuclear the second energy level is a little farther away than the first
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, The energy level where an electron is located, is shown by the period on the periodic table
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
The energy level where an electron is located, is shown by the period number on the periodic table. The number of the period represents the number of orbits or shells. Shells represents the energy levels of an element.
Therefore, the energy level where an electron is located, is shown by the period on the periodic table.
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Which of these represents an individual form of life such as an animal, plant, or single-celled life form?
a
Organ
b
Organism
c
Organ system
d
Tissue
Answer:
B: Oganism is gonna be the right answer for this one hope I helped
Answer:
i think is c,im not sure
Explanation:
What pressure will be exerted by 25 g of CO2 at temperature of 25°C and a volume of .50 L?
Please, i dont know what the brainliest thing is but ill give it.
Answer:
P = 27.9 atm
Explanation:
Given data:
Mass of CO₂ = 25 g
Temperature = 25°C (25+273.15 K = 298.15 K)
Volume of gas = 0.50 L
Pressure of gas = ?
Solution:
Firs of all we will calculate the number of moles of gas,
Number of moles = mass/molar mass
Number of moles = 25 g/ 44 g/mol
Number of moles = 0.57 mol
Pressure of gas :
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
P × 0.50 L = 0.57 mol × 0.0821 atm.L/ mol.K × 298.15 K
P = 13.95 atm.L/ 0.50 L
P = 27.9 atm
a base is defined as a compound that produces
answer the pic below
Answer: 18
Explanation:
i think so
How many molecules are there in 2.3 grams of NH4SO2
Answer:
Explanation:
First, calculate the molar mass of NH4SO2. The molar mass can determine the number of moles. Then use Avogadro's number to calculate the number of molecules.
Key Steps:
Step 1. Calculate the molar mass of your compound
Step 2. Divide 2.3 grams by the molar mass of NH4SO2, this gives us moles
Step 3. Multiply by Avogadro's number (6.02x10^23) this gives you molecules.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.68×10²²molecules are there in 2.3 grams of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole. we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
moles of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex]= 2.3 grams ÷82.10g/mol
=0.028moles
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of atoms/molecules of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex]=0.028 × 6.022×10²³
=1.68×10²²molecules
Therefore, 1.68×10²²molecules are there in 2.3 grams of (NH[tex]_4[/tex])[tex]_2[/tex]SO[tex]_4[/tex].
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Explain why the following statement is either true or false: The idea that all matter
consists of the elements was first introduced a few hundred years ago.
Answer: true
Explanation: For about 2000 years, people accepted Aristotle's idea that all matter is made up of just four elements: earth, air, water, and fire. Starting about 500 years ago, scientists began discovering all of the elements that are known today
In order for a cell to continue being efficient at exchanging materials, what must it do to maintain its surface-to-volume ratio as it grows larger
Explanation:
It will have to change its form in order for the cell to focus on developing and retaining a viable, in order to be large and narrow as in the situation of the nerve cells or to build a more 'contoured' surface, that is, to establish microvillus.
Which of the following will produce a 2 molar solution of copper (II) chloride?
Group of answer choices
1- Measure 1 mole of copper (II) chloride and add water until there are two liters of solution
2- Add 1 mole of copper (II) chloride to 2 liters of water
3- Measure 2 moles of copper (II) chloride and add water until there is one liter of solution
4- Measure 1 liter of water and then add to it 2 moles of copper (II) chloride
Answer:
do we have to answer all of them I'm new to this
Which of the following cooking materials does NOT conduct heat?
A. Silicone
B. Teflon
C. Metal
D. Wood
Can somebody who knows these for sure!! Answer the true or false questions plz thanks!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DD
Answer:
good luck
Explanation:
1. false 2. True 3.False
4.true
5.true
Answer:
1.False
2.False
3.True
4.True
5.True
Which of the following is the best definition of a physical property?
A. Something that can be observed or measured while changing the identity of the substance.
B. Tearing paper in half.
C. Something that can be observed or measured without changing the identity of the substance.
D. The ability of something to undergo a change or reaction.
Answer:
The answer is either A or C figure it out sorry
The answer is A) Something that can be observed or measured while changing the identity of the substance. C) Something that can be observed or measured without changing the identity of the substance.
What's a physical property and examples?A physical asset is a function of count that isn't associated with a change in its chemical composition. Familiar examples of bodily homes consist of density, coloration, hardness, melting and boiling factors, and electric conductivity.
Physical homes are those popular properties you word maximum readily approximately a substance, including its length, state of being counted (stable, liquid, or gas), color, mass, density, and power. Values for physical residences can be determined via tests that do not modify the substance being tested.
The definition of bodily is matters which are of nature or of the frame. An example of physical is plantlife developing in the ground. An example of physical is a person constrained to a wheelchair because of disabilities. A bodily exam.
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Read the summary below. Choose the answer that BEST fits into the blank to complete the summary.
Atoms are tiny particles, which are the building blocks of all matter. ________________
The number of protons of an atom has is called its atomic number, which decides what kind of atom it is. Changes in the number of neutrons in an atom make an isotope and changes in the number of electrons make a positive or negative ion.Immersive Reader
An atom has a nucleus, made up protons and neutrons, which is surrounded by a cloud of electrons.
An atom has quarks and leptons, which make up the nucleus and are positively and negatively charged.
An atom has an atomic mass, which measures the amount of electrons and an atomic weight, which measures protons.
An atom has mostly empty space except for the nucleus, which contains nucleons, neutrons, and electrons.
Answer:
An atom has a nucleus, made up protons and neutrons, which is surrounded by a cloud of electrons.
Explanation:
An atom is the smallest indivisible part of any element that takes place in a chemical reactions.
These are the fundamental building blocks of every element and even compounds.
There are three known subatomic particles found within an atom. Electrons are the negatively charged particles in an atomProtons are the positively charged particles of an atomNeutrons do not carry any charges.Both protons and neutrons are located within the tiny space called nucleus at the center of an atom.
Electrons moves round in orbitals at the spaces outside of the nucleus.
What is the bright band we call the Milky Way?
O A. the asteroid belt
B. some of our galaxy
Oc.
C. a group of galaxies
O D. a nebula dust cloud
O E. the nearest star cluster
Can somebody help me please??????
How many pairs of electrons are shared in a double bond?
A. 1
B. 2.
C. 3
D. 4
Answer:
B. 2
Explanation:
A double covalent bond is where two pairs of electrons are shared between the atoms rather than just one pair
B
A Double bond is when two atoms share two pairs of electrons with each other. It is depicted by two horizontal lines between two atoms in a molecule
When a substance changes from a solid to a liquid what is it called brainlest
A.Freezing
B.Boiling
C.Sublimating
D.Melting
How many moles are in 2.5 g of N2
O 0089 moles
0.18 moles
13 moles
11 moles
the gas mixture is at STP, what is the partial pressure of the argon?
(A) 152 torr (B) 228 torr (C) 380. torr (D) 760. torr
2.) Compared to the average kinetic energy of 1 mole of water at 0 oC, the average kinetic energy
of 1 mole of water at 298 K is
(A) the same, and the number of molecules is the same
(B) the same, but the number of molecules is greater
(C) greater, and the number of molecules is greater
(D) greater, but the number of molecules is the same
3.) If the pressure on a given mass of gas in a closed system is increased and the temperature
remains constant, the volume of the gas will
(A) decrease (B) increase (C) remain the same
4.) Which gas has approximately the same density as C2H6 at STP?
(A) NO (B) NH3 (C) H2S (D) SO2
5.) At a temperature of 273 K, a 400. milliliter gas sample has a pressure of 760. millimeters of
mercury. If the pressure is changed to 380. millimeters of mercury, at which temperature will
this gas sample have a volume of 551 milliliters?
(A) 100 K (B) 188 K (C) 273 K (D) 546 K
Get the answers to these questions
Back to the Unit 10 Old Tests Page
Back to the Unit 10 Pag
Answer:
A. 0.089
Explanation:
Hope this helps :)
A solenoid is a coil of wire that produces a magnetic field when carrying an electric current. The strength of the magnetic field
produced by a solenoid can be increased in two basic ways: increasing the number of loops in the solenoid or increasing the
amount of current running through the solenoid. A solenoid's magnetic field can be increased to an even greater degree by wrapping
the wire around a material that can be magnetized. Four solenoids are shown below.
000000000000000
Solenoid A
Copper Wire Only
Current: 6 amps
Solenoid B
Copper Wire Only
Current: 8 amps
que
ཤགས་
Solenoid C
Copper Wire + Iron Core
Current: 6 amps
Solenoid D
Copper Wire + Iron Core
Current: 8 amps
Based on the strength of the magnetic fields they produce, arrange the solenoids from strongest to weakest.
Solenoid A
Solenoid B
Solenoid C
Solenoid D
Answer: Motion, providing a burst of power that can move a specific part of the device.
Explanation: Hope this helps
Answer:
D > C > B> A
Explanation:
i solved this on study island
To describe a rock's texture, geologists determine
Answer:
the size, shape and orientation of mineral grains
Explanation:
To describe a rock's texture, geologists determine the size, shape and orientation of mineral grains.
Texture deals with the relationship between minerals within a fine mass.
Rocks are aggregate of minerals and they are fundamental building blocks of rocks. We can observe rock textures by merely looking at it with our naked eyes. Also, we can obtain thin slices and sections of rock to have a closer look into the rock.As charges saved
6. A metal, "M", forms an oxide compound with a general formula of 2 M's to every 10. From this ratio, what group on the Periodic Table must element "M"
belong to?
Group 1
Group
Group 17
Group 16
200 feet in 30 seconds is what speed?
Answer:
6.6666666667 feet per second I believe
Answer:
4.5 miles per hour.
Explanation:
30* 2= 400 feet in 1 min
24,000 per hour
5280 feet is 1 mile.
15 points !! What is the underlying cause of atmospheric movement near Earth's surface?
O solar radiation
O rotation of Earth
O gravitational pull
O convection currents
15 points !!!!
Answer:
The movement of air through Earth's -- or any planet's -- atmosphere is called wind, and the main cause of Earth's winds is uneven heating by the sun. This uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.
Explanation:
What is the molarity of 350 mL solution that has had 32.0 g of NaCl dissolved in it?
Answer:
Molarity = 1.57 M
Explanation:
Given data:
Volume of solution = 350 mL (350 mL × 1L /1000 ml = 0.35 L)
Mass of NaCl = 32.0 g
Molarity of solution = ?
Solution:
Number of moles of solute:
Number of moles = mass/molar mas
Number of moles = 32.0 g/ 58.44 g/mol
Number of moles = 0.55 mol
Molarity:
Molarity = number of moles / volume in L
Molarity = 0.55 mol / 0.35 mL
Molarity = 1.57 mol/L
Molarity = 1.57 M
How can rocks be distinguished from each other?
Their shape can distinguish rocks.
All types of rocks have different density.
Different types of rocks have different chemical composition.
Each type of rocks is different in color.
Answer:
Different types of rocks have different chemical composition.
Explanation:
Rock can be distinguished from each other by their chemical composition which is a product of the minerals they contain.
A rock is an aggregate of minerals. Different suites of rocks have their inherent mineralogical composition and facie. This is because, these rocks form under different types of conditions from time to time. Igneous rocks form from molten rocks, sedimentary rocks form from pre-existing rocks and metamorphic rocks for under elevated temperature and pressure conditions. All these conditions plays important roles in the differentiation of minerals in the rock.If a wave has a frequency of 2.5 Hz and a wavelength of 3m, what is the speed of the wave?
Answer:
The speed should be 7.5
Explanation:
wavespeed (c) = frequency (ƒ) x wavelength (λ)
solve this question please
Answer:
Check explanation for answer
Explanation:
Let's analyze each reaction per separate and explain the reason of the type of reaction:
a) CH₃CH₂CH₃ + 5O₂ -------> 3CO₂ + 4H₂O
Type of reaction: Combustion
In this case, the combustion is a reaction where a compound reacts with a molecule of oxygen to produce, in almost every case, CO₂ and H₂O. Therefore, this reaction can only be a combustion. It cannot be combination because combination requires two compounds to be combined and formed, in most of the cases, one product. In this case we have two. It can be similar to a double displacement but not combination.
b) KOH + HClO₄ --------> KClO₄ + H₂O
Type of reaction: Acid base reaction, double displacement.
This is clearly an acid base reaction cause we have an acid (HClO₄) reacting with a base (KOH) to produce a salt and water. It's also a double displacement reaction, because as you can see, the atom of Potassium (K) is displacing the H, and the H displaces the K simultaneously, and form two new products.
c) CH₃CH₂OH + 3O₂ -------> 2CO₂ + 3H₂O
Type of reaction: Combustion
The reason, the same for case a).
d) CuSO₄ + ZnCrO₄ ---------> CuCrO₄ + ZnSO₄
Type of reaction: Double displacement and precipitation
In this case, it's pretty similar to case b), The Cu replaces the Zn in the CrO₄, while the Zn replaces the Cu with the SO₄. But it's also a precipitation because the CuCrO₄ that was formed is in solid state, and if the reactants were in aqueous state and a solid was formed, this means that this solid is precipitating from the reaction. Therefore, it's a precipitation reaction too.
Hope this helps
Newtons first law second law and third law
help
Answer:
In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
Explanation:
hope this helps
Explain how you would change a solution with an original pH of 8.0 to have a pH of
12.0?
Answer: Acidity and basicity, proton concentration, the pH scale. You may have noticed that acidic things tend to taste sour, or that some basic. Since the scale is based on pH values, it is logarithmic, meaning that a change of 1 pH unit .
Explanation: PLEASE MARK ME AS BRAINLIEST