Why is the Milky Way considered a galaxy
Answer:
Explanation:
All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.
Answer: it is
Explanation: A galaxy is a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction, plus there are 100 billion planet in it.
What is the molar concentration of a solution prepared by dissolving 3.05 grams of sodium acetate in enough water to prepare 3.43 x 102 mL of the solution
Answer:
0.296 M
Explanation:
What is the molar concentration of a solution prepared by dissolving 3.05 grams of sodium acetate in enough water to prepare 3.43 x 102 mL of the solution
sodium acetate NaCH3COO has molar mas of
23 + 12 +24 + 1 +32 = 92 g/mol
3.05 g is 3.05 g/ 92 g/mol = 0.0328 moles
it is distributed over 102 mL = 0.102 L
its concentration is 0.0328/ 0.102 =0.296 M Mhttps://brainly.com/question/25586315?answering=true&answeringSource=feedPublic%2FhomePage%2F3#
A strip of zinc metal was placed in a beaker that contained 120 mL of a solution of copper (II) nitrate, Cu(NO3)2(aq). The mass of the copper produced was 0.813 g. Find the initial concentration of the solution of copper (II) nitrate.
Answer:
molarity 0.1
Explanation:
mass of copper nitrate =2.4
no of moles exist in 120ml= 2.4/187.5=0.0128mole
molarity =.0.0128/.12=0.1m
a
A sample of gas has a volume of 3.50 L and a pressure of
125 mm Hg. What will the new pressure be when the volume
is decreased to 2.75 L? The temperature stays the same.
Answer:
159.09 mmHgExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
From the question we have
[tex]P_2 = \frac{125\times3.50 }{2.75} = \frac{437.5}{2.75} \\ = 159.090909...[/tex]
We have the final answer as
159.09 mmHgHope this helps you
_ is the process in which an element spontaneously transforms into another isotope of the same element, or into a different element.
Answer:
Nuclear transmutation
Explanation:
The process in which an element spontaneously transforms into another isotope of the same element, or into a different element is called nuclear transumutation. It occurs when the number of protons or neutrons in the nucleus of an atom is changed.
26 Milkweed contains a poison known as cardenolides. Monarch butterflies eat the milkweed plant and hold on to this toxic compound. The
chemical formula for cardenolides is shown below.
CH18C20H15CHCO2
Problem
How many atoms of each element are in one molecule of cardenolides?
A
42 carbon atoms, 23 hydrogen atoms, and 2 oxygen atoms
B
20 carbon atoms, 33 hydrogen atoms, and 2 oxygen atoms
с
34 carbon atoms, 43 hydrogen atoms, and 2 oxygen atoms
D
23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms
please help ASAP !!
Cardenolides, with the chemical formula CH₁₈C₂₀H₁₅CHCO₂ have (D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms.
Milkweed contains a poison known as cardenolides. The chemical formula for cardenolides CH₁₈C₂₀H₁₅CHCO₂.
The subscripts in the formula represent the atomicities, that is the number of atoms of each element in each part of the formula.
We can calculate the total number of atoms of each element by adding its atomicities.
Carbon atoms[tex]C = 1 + 20 + 1 + 1 = 23[/tex]
Hydrogen atoms[tex]H = 18 + 15 + 1 = 34[/tex]
Oxygen atoms[tex]O = 2[/tex]
Cardenolides, with the chemical formula CH₁₈C₂₀H₁₅CHCO₂ have (D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms
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For a constant force, when the surface area is tripled the
.
— Pressure =
force
surface area
pressure is
(a) doubled.
(b) a third as much.
(c) tripled.
(d) unchanged.
I think it is c
because it say tripled
Part 1. After learning about the different parts and functions of a meroscope you will now reflect on the importance of ench part citeit significance of each parts by naming it and answering the guide question
Explanation:
after learning more about the position and would
If 100.0 g of carbon-14 decays after 2 half lifes, how much of the sample would remain?
Answer:
25 percent
Explanation:
have a good day/ night
Answer:
25%
Explanation:
hope it helps
what is the formula for cadmium (ii) chlorate?
Answer:
a chemical compound
Explanation:
copper(ii) chlorate is a chemical compound of the transition metal copper and the chlorate anion with basic formula cu(cio)3 and 2
A copper sulphate solution contained 0.100 moles of copper sulphate dissolved in 0.500 dm cubed of water. Calculate the mass of copper sulphate in 30.0cm cubed of this solution. Relative formula mass (mr): CuSO4= 159.5
Answer:
cm^3 —> dm^3
divide by 1000
159.5 — Mr of CuSO4
n (moles in mol) = c (concentration in mol/dm^3) * v (volume in dm^3)
0.100 mol of CuSO4 dissolved in 0.5dm^3 of water
calculate for mass of CuSO4 dissolved in 0.03dm^3 (30cm^3) of the solution
n = m/Mr
m = n*Mr
if 0.1 mol is dissolved in 0.5 dm^3 of water
0.5/0.03 ≈ 16.66666667
0.1 = 0.05
0.1 / 16.66666667 = 0.006
0.5 / 16.66666667 = 0.03
0.006 (mol of CuSO4) = 0.03 (dm^3 solution)
0.006 * 159.5 = 0.957 g
I think this is the answer
The mass copper sulphate CuSO₄ in 30ml solution is 957.6g.
How to determine the mass of copper sulphate in the given solution?To determine the mass of copper sulphate in the given solution, compare both the molarity given
M₁V₁=M₂V₂
n₁/V1=n₂/V2
0.1/0.5=n₂/30 cm³=ml
n₂=6 moles
6×159.5=957.6g
Multiply the calculated moles with the relative mass/molecular mass to get the mass of CuSO₄.
hence, the mass of CuSO₄ is 957.6g
Learn more about dilution equation.
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Which of the following is NOT a conductor of heat?
A. a plastic pot handle
B. a copper pan
C. a metal spoon
A) A plastic pot handle.
Explanation:Metals are very good conductors of heat because they contain delocalised electrons that can flow through the metal, transferring heat.
Both a copper pan and a metal spoon are made of metals, so are very good conductors of heat.
Plastic is an insulator, the opposite of a conductor. This makes it very bad at conducting heat, which is why it is used as the handle (it stops you burning yourself when you hold the pot). The answer is therefore A.
Calculate the molecular mass of the element
They give:H=1,AI=27,S=32,0=16,Cu=64,P=31,Mg=24,N=14,Na=23
Answer:
Na2SO4
2×23 + 32 + 4×16
46 + 32 +64
=142g
Which statement did Kepler’s investigations of the movement of the planets explain?
Gravity acts on all objects in the universe.
Jupiter has more moons than earth.
Earth is not the center of the universe.
The sun is more massive than earth.
Calculate the molecular mass of the element
They give:H=1,AI=27,S=32,0=16,Cu=64,P=31,Mg=24,N=14,Na=23
Answer:
Mg (NO3)2
24 + 2×(14+ 3×16)
24+2×(14+48)
24+2×(62)
24+ 124
=148g
how many moles of hydrogen are there in one mole of h2o?
18. Consider the information about carbon provided in Model 4.
a. Are diamonds and graphite made from the same element?
Answer:
yes
Explanation:
What are the word equations for the following? Please help
Calcium oxide + water
Magnesium + hydrochloric acid
Sodium hydrogen carbonate + citric acid
Iron + salt water
Calcium oxide + water = calcium hydroxide.
Magnesium + hydrochloric acid = magnesium chloride + hydrogen.
Sodium hydrogen carbonate + citric acid = Na3C6H5O7(aq)+3H2O(l)+3CO2(g)
Iron + salt water = 4Fe(OH)3 (rust)
Answer:
1. CaO + H2O _____ Ca(OH)2
Calcium oxide + Water _____ Calcium hydroxide
2. 2 HCI + MG _____ MgCl2 + H2
Magnesium + hydrochloric acid _____ Magnesium Chloride + hydrogen gas
What is a substrate.
Answer:
A substrate is a molecule acted upon by an enzyme. A substrate is placed into the active site of the enzyme, or the area that permits weak bonds to be formed between the two molecules
Explanation:
Hope it helps:)
Explain why photosynthesis is essential for living plants and animals.
what is atomic mass in Chemistry
Answer:
the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D)
Explanation:
Refer to the following balanced equation in which ammonia
reacts with nitrogen monoxide to produce nitrogen and
water.
4NH3(g) + 6NO(g) → 5N2(8) + 6H2O(l)
How many moles of NO are required to completely react with
2.45 mol NH3 ?
4NH₃(g) + 6NO(g) → 5N₂(8) + 6H₂O(l)
The mole ratio of NO to NH₃ based on the balanced equation is 6 to 4 (or 3 to 2 in the simplest form)
Therefore in the reaction, there are ³/₂ more moles of NO than NH₃.
⇒ since moles of NH₃ = 2.45 mol
then moles of NO = 2.45 mol × ³/₂
= 3.675 mol
i need help on this plsss
Answer:
Ionic Compound
Explanation:
1) NaBr
2) CaCl2
3) MgS
4) AlO
5) Li3P
6) Cs3N
7) KI
8) BaF2
9) RbNO2
10) BaO
11) Potassium oxide
12) Magnesium iodide
13) Aluminum chloride
14) Calcium bromide
15) Sodium nitride
16) Lithium fluoride
17) Barium phosphide
18) Dicesium sulfide
19) Strontium fluoride
20) Sodium chloride
Hope this helps!!
what does a large positive standard cell potential imply about the spontenty of the redox reaction occuring in teh cell
Answer : E cell standard is the potential difference between the two electrodes under standard conditions. Overall tendency for the redox reaction to occur spontaneously. A large positive E cell means the reaction is more spontaneous, and a negative E cell indicates a non spontaneous reaction.
Explanation: hope this answers your question
How could investigating what happens to the air getting warmed up near the ground help us explain some of the mechanisms that lead to hailstorms?
Answer:
Hailstones are formed when raindrops are carried upward by thunderstorm updrafts into extremely cold areas of the atmosphere and freeze.
so i'm gonna guess and say that it does not matter because the rain drops freeze in the atmosphere in a cold place.
Explanation:
BRAINLIEST?Hailstones are formed when raindrops are carried upward by thunderstorm updrafts into extremely cold areas of the atmosphere and freeze.
what is atmosphere ?An atmosphere is defined as a blanket of gases that surrounds Earth which held near the surface of the planet by Earth’s gravitational force of attraction.
Argon, oxygen and nitrogen from the three main constituents of the atmosphere, it Helps to retain the sun’s heat and prevents it from escaping back into space, Protects life from harmful radiation, Plays a major role in Earth’s water cycle.
The atmosphere has five distinct layers which are determined by the changes in temperature and it happen with increasing altitude. Layers of Earth’s atmosphere are divided into five different layers as Exosphere
Thermosphere, Mesosphere, Stratosphere, Troposphere
For more details regarding atmosphere , visit
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I just need help. Help help help
Answer:
my bro what is the question first ?
Explanation:
Escribe la relacion entre las actividades humanas y el cambio climatológico
ayudaaaaaaaaaaa plisssssssssssss
English:
"Human activities contribute to climate change by causing changes in Earth's atmosphere in the amounts of greenhouse gas- es, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere." (ei.lehigh.edu)
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
/
Español:
"Las actividades humanas contribuyen al cambio climático al provocar cambios en la atmósfera de la Tierra en las cantidades de gases de efecto invernadero, aerosoles (partículas pequeñas) y nubosidad. La mayor contribución conocida proviene de la quema de combustibles fósiles, que libera dióxido de carbono a la atmósfera." (ei.lehigh.edu)
¡Que tenga un lindo día!
Espero que esto sea lo que estás buscando, pero si no, ¡comenta! Editaré y actualizaré mi respuesta en consecuencia. (ノ^∇^)
- Heather
Which ingredients are needed to transform nadp to nadph?.
Answer:
according to online:
"Hydrogen ions are transported with the electrons along the chain of reactions. In photosystem I, the electrons are energized, and the energy is stored in molecules of NADP+. During these reactions, the NADP+ molecules are reduced by the addition of electrons. A hydrogen ion is added to NADP+ to form NADPH."
Explanation:
hope this helps!! :)
HELP !!
Given the balanced chemical equation:
4 Fe + 3 O2 ----> 2 Fe2O3
How many moles of iron(III) oxide, Fe2O3 , will be produced if 12 moles of oxygen gas, O2 , are consumed
Answer:
8 moles of Fe2O3
Explanation:
You can use the mole ratio give. For every 3 O2 you produce 2 Fe2O3. With this you can find the number of moles. 12 O2 multiplied by the ratio 2/3 gives you 8 moles
why does reducing solute particle size increase the speed at which the solute dissolves in water .
Because it has less surface area. This can be applied to something like cooking potatoes. Cooking a larger potato will take longer than a small potato.
