This diagram shows the shift in the spectrum for hydrogen light from several different sources in the universe compared to a laboratory reference. What is the best argument you can make from this data?
A) More distant galaxies are hotter than nearby stars
B) More distant galaxies are moving toward us faster than a nearby star
C) More distant galaxies are moving at the same rate as nearby stars
D) More distant galaxies are moving away faster than nearby stars
Answer:
Many stars and distant galaxies move at varying speeds compared to each other.
Explanation:
All statements are contradictory, so play it safe and declare different energy levels.
Answer:
I think the answer is A) More distant galaxies are hotter than nearby stars
Explanation:
Hope this helps :)
Solve 8 = 2x + 4.
x = −4
x = −1
x = 0
x = 7
Answer:
value of x is -4 to solve 8=2×+4
Answer:
x=-4
Explanation:
just took test
a solid sample of oil is warmed until it turns into a liquid. which property of the oil will decrease?
I think the answer is it turnes into a gas. Hope it helps! :) Asnwer is density.
A solid sample of oil is warmed until it turns into a liquid. Density is the property of the oil will decrease.
What do you mean by density ?Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
As temperatures rose, the density of all oils decreased. The temperature coefficients of density change differed slightly between oils. The density differentials between oil and water, as well as their temperature coefficients, varied significantly between oils.
Oil is denser than alcohol but denser than water. Because the molecules that make up oil are larger than those that make up water, they cannot pack as tightly as water molecules can. They occupy more space per unit area and have a lower density.
Thus, Density is the property of the oil will decrease.
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If 0.600 moles of Nitrogen gas is collected at a pressure of 234 kPa in a
container which has a volume of 12.0 L, what is the temperature of the
nitrogen gas in the container? Express the temperature in Kelvin. (use the R
value for kPa)
563.18 K
O 4680 K
O 52 atm
O 337.91K
Answer:
563.18 K
General Formulas and Concepts:
Gas Laws
Ideal Gas Law: PV = nRT
P is pressure (in kPa)L is volume (in L)n is molesR is gas constantT is temperature (in K)Explanation:
Step 1: Define
[Given] n = 0.600 mol N₂
[Given] P = 234 kPa
[Given] L = 12.0 L
[Given] R = 8.314 L · kPa · mol⁻¹ · K⁻¹
[Solve] T
Step 2: Solve for T
Substitute in variables [Ideal Gas Law]: (234 kPa)(12.0 L) = (0.600 mol)(8.314 L · kPa · mol⁻¹ · K⁻¹)TMultiply: 2808 kPa · L = (4.9884 L · kPa · K⁻¹)T[Division Property of Equality] Isolate temp: T = 562.906 KTopic: AP Chemistry
Unit: Gas Laws
How many moles is 3.52 x 10^24 molecules of water?
A. 6.34 x 10^25 mol H2O
B. 2.12 x 10^4 mol H2O
C. 5.85 mol H2O
Answer:
[tex]\large \boxed{\text{5.40 mol}}[/tex]
Explanation:
[tex]\text{Moles of water} = 3.25 \times 10^{24}\text{ molecules} \times \dfrac{\text{1 mol }}{6.022 \times\ 10^{23} \text{molecules}} = \textbf{5.40 mol}[/tex]
PLS HELP IF YOU WANT A BRAINLIEST Amelia makes a Venn diagram to compare the advantages and disadvantages of asexual reproduction and sexual reproduction.
Which label belongs in the region marked X?
A. Less competition for resources
B. Faster
C. No variation in DNA
D. Less energy required
Answer:
d. less energy required
Explanation:
it said it in my book and i took the edg quiz
Write the balanced COMPLETE ionic equation for the reaction when Na₂CO₃ and AgNO₃ are mixed in aqueous solution. If no reaction occurs, write only NR.
Final answer:
The balanced complete ionic equation for the reaction between Na₂CO₃ and AgNO₃ in aqueous solution is 2Na+ + 2NO₃- + CO₃²- + 2Ag+ → 2Na+ + 2NO₃- + Ag₂CO₃. The sodium and nitrate ions can be eliminated from the equation since they appear unchanged on both sides. The net ionic equation is CO₃²- + 2Ag+ → Ag₂CO₃.
Explanation:
Balanced Complete Ionic Equation:
2Na+(aq) + 2NO3-(aq) + CO32-(aq) + 2Ag+(aq) → 2Na+(aq) + 2NO3-(aq) + Ag2CO3(s)
In this reaction, the sodium ion (Na+) and the nitrate ion (NO3-) appear unchanged on both sides of the equation, so they can be eliminated from the reaction.
Net ionic equation:
CO32-(aq) + 2Ag+(aq) → Ag2CO3(s)
Magnesium hydroxide + hydrogen sulfate
Answer:
Below.
Explanation:
Magnesium hydroxide + Hydrogen Sulphate --> Magnesium Sulphate + Water
The balanced equation:
Mg(OH)2 + H2SO4 ---> MgSO4 + 2H2O
Elements with an oxidation number of one include which of the following
The answer is C. Potassium and D. Lithium.
The correct answers to which elements have an oxidation number of 1 are C. Potassium and D. Lithium, as both are group 1 alkali metals that typically form ions with a +1 charge.
Both potassium and lithium belong to the group 1 elements of the periodic table, also known as the alkali metals. These metals typically have a +1 oxidation state when forming compounds. Potassium (K) for example, readily loses one electron to form a K+ ion, also known as a monovalent cation. Similarly, lithium (Li) will also lose one electron to form an oxidation state of +1.
Magnesium (Mg) and Calcium (Ca), on the other hand, form ions with a 2+ charge, indicating an oxidation state of +2. For instance, in [tex]MgCl_2[/tex], magnesium has an oxidation number of +2. Therefore, options A. Magnesium and B. Calcium do not have an oxidation number of 1 and are not correct answers to the question.
How many moles are needed to make 2.5 L of a 3.8 M solution?
9.5 mol
0.66 mol
1.5 mol
15 mol
Answer: 9.5
Explanation:
The moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.
What is the definition of Molarity ?It is defined as moles of solute in certain volume of Solvent.
The units of Molarity is mol/L or Molar(M)
Molarity = moles of solute / Volume of Solvent
It is given that a 2.5 L , 3.8 M solution
Let n be the number of moles needed
M = n/V
Substituting the values in the equation
3.8 = n /2.5
n = 3.8 * 2.5
n = 9.5 moles
Therefore the moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.
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Complete and balance the following redox reaction in acidic solution As(s) -> H 2 AsO 4 (aq)+ASH 3 (s)
Answer:
12H2O + 8As = 3H2AsO4- + 5AsH3 + 3H+
Explanation:
- This is balanced in an acidic solution and should be correct.
Consider again the reaction for photosynthesis: 6CO2 + 6H2O → C6H12O6 + 602
Select the correct mole ratio to complete the calculation shown below.
1 mol O2 ? 180. 18 g C6H1206
1.00 g 0, x 20 00 2x5x-
02 32.00 g 0,*;* 1 mol CH,,O =xg C6H1206
1 mol C6H1206
6 mol O2
6 mol O2
1 mol C6H12O6
6 mol C6H1206
1 moln
1) Intro
Answer:
6 CO2 + 6H2O produces 1 C6H12O6 + 6O2
Explanation:
Question 9
1 pts
A gas of 3.4 moles occupies a volume of 0.046 Lat 298 K. What is the pressure
in kPa?
O 4.40 x 100 kPa
O 9.45 x 103 kPa
O 6.1 x 102 kPa
O2.1x 105 kPa
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Answer:
2.1 x 105 kPa
Explanation:
Answer:
2.1 x 105 kPa
Explanation:
just took a quiz got it right so good luck!! :)
What kind of force does not allow movement to occur?
What volume of nitrogen gas (N2) is equal to 3.42x1022 molecules of this substance?
Answer : The volume of nitrogen gas equal to [tex]3.42\times 10^{22}[/tex] molecules of this substance is, 1.27 liters.
Explanation :
First we have to calculate the moles of nitrogen gas.
As, [tex]6.022\times 10^{23}[/tex] molecules present in 1 mole of nitrogen gas
So, [tex]3.42\times 10^{22}[/tex] molecules present in [tex]\frac{3.42\times 10^{22}}{6.022\times 10^{23}}=0.0568[/tex]mole of nitrogen gas
Now we have to calculate the volume of nitrogen gas.
As we know that, 1 mole of substance occupies 22.4 L volume of gas at STP.
As, 1 mole of nitrogen gas occupies 22.4 L volume of nitrogen gas
So, 0.0568 mole of nitrogen gas occupies [tex]0.0568\times 22.4=1.27L[/tex] volume of nitrogen gas
Therefore, the volume of nitrogen gas equal to [tex]3.42\times 10^{22}[/tex] molecules of this substance is, 1.27 liters.
Answer:
1.27
Explanation:
* If you found a fossil like the one pictured above in an open grassy field, what could you infer about this particular part of Earth
during much earlier times?
Earth's earlier environment in this particular area was covered with water.
Earth's earlier environment in this particular area was most likely a deep
canyon
Earth's earlier environment in this particular area was frozen like the
ground coverings of a tundra.
Earth's earlier environment in this particular area was also similar to the
open, grassy field you see today.
Answer:
A
it on the explanation for ms yoder
Humans first appeared in the _____ period.
A) Mesozoic
B) Paleozoic
C) Jurassic
D) Cenozoic
Answer:
They first appeared in the fossil record around 66 million years ago, soon after the Cretaceous–Paleogene extinction event that eliminated about three-quarters of plant and animal species on Earth, including most dinosaurs.
Explanation:
Answer:
A or b I learned this in history
Which of these did your answer include?
Each hydrogen atom is bonded to the oxygen atom with a single bond.
The oxygen atom has two lone pairs.
The molecule is bent.
Oxygen is more electronegative than hydrogen.
Each O-H bond is polar.
The molecule is asymmetrical.
The asymmetry and the polar bonds produce an overall molecular dipole.
The oxygen atom has a partial negative charge, and the hydrogen atoms have a partial positive
charge.
The oxygen atom has a partial negative charge and the Hydrogen atoms have a partial positive charge
The O2 atoms have a covalent bonding and are attracted to the electrons more strongly.
The sharing of the electrons gives them water molecules a slightly negative change near the O2 atom. A slight positive change near the H2. Hence the option D is correct.Learn more about the did your answer includes.
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If 27.9 grams of calcium carbonate reacts with excess HCl, how many moles of calcium chloride are produced
Answer:
[tex]\large \boxed{\text{0.2797 mol}}[/tex]
Explanation:
We must do the conversions:
mass of CaCO₃ ⟶ moles of CaCO₃ ⟶ moles of CaCl₂
We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.
Mᵣ: 100.09 110.98
CaCO₃ + 2HCl ⟶ CaCl₂ + CO₂ + 2HCl
m/g: 27.9
(a) Moles of CaCO₃[tex]\text{Moles of CaCO}_{3} = \text{27.9 g CaCO}_{3}\times \dfrac{\text{1 mol CaCO}_{3}}{\text{100.09 g CaCO}_{3}}= \text{0.2787 mol CaCO}_{3}[/tex]
(b) Moles of CaCl₂[tex]\text{Moles of CaCl}_{2} =\text{0.2787 mol CaCO}_{3} \times \dfrac{\text{1mol CaCl}_{2}}{\text{1 mol CaCO}_{3}} = \text{0.279 mol CaCl}_{2}[/tex][tex]\text{The reaction produces $\large \boxed{\textbf{0.279 mol}}$ of CaCl}_{2}[/tex]
The number of moles in 4.5 x 1024 atoms of oxygen is
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically, the formula for the number of moles can be given as
number of mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
number of atoms of oxygen=4.5 x 10²⁴atoms
Substituting all the given values in the above equation, we get
number of atoms of oxygen=(4.5 x 10²⁴)/(6.02 x 10²³)
number of atoms of oxygen= 7.475 mole
Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.
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Why do you think it is
important for cattle ranchers to understand the basics of chemistry?
Answer:
Because chemistry is the science that studies the properties of the substances and the reactions they undergo, which is the basis of metabolism (chemical reactions inside the body) and the health science.Explanation:
it is important for cattle ranchers to understand the basics of chemistry because feeding and health of their valuable animals rely in the principles of chemical science.
Understanding what elements or compounds animal food must contain for the animals grow better is an esential part of animal husbandry.
The same can be said about the vitamins, drugs, antibiotics, and medicines in general, needed by the livestock to be healthy and cure diseases.
Chemistry involves the study of the substances, their propeties, and how to combine them (chemical reactions) which is the basis of the nutritrion and medicine; two essential parts of cattle breeding.
Which process takes the
longest to occur?
freezing
melting
boiling
heating the solid
What atom has 26 protons and 24 electrons
Answer:
iron (Fe)
Explanation:
Since an atom is electrically neutral, so the atom has 26 electrons also. Ion has 24 electrons, so it has experienced loss of 2 electrons. So, charge on ion is +2. Also, the element with 26 protons (26 atomic number) is iron (Fe).
Which one is a balanced equation?
Answer:
Explanation:
but what is it.
How does solar reduces global warming.
Answer: By going solar, you can reduce demand for fossil fuels, limit greenhouse gas emissions, and shrink your carbon footprint
Explanation:
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
A.strongly acidic
B.strongly basic
C. slightly basic
D.slightly acidic
Answer:
C. slightly basic
Explanation:
0-7 = acidic
7 = neutral
7-14 = basic
- Since the pH is just over 7, the answer would be slightly basic.
- Hope this helps! Please let me know if you need a further explanation.
The human blood having a pH between 7.35 and 7.45 simply means the blood is slightly basic.
The correct answer to the question is Option C. slightly basic.
The pH of a solution is simply a measure of the acidicity or alkalinity of the solution.
The pH scale ranging from 0 to 14 gives a discription of the acidicity or alkalinity of a solution as follow:
0 to 6 => acidic
7 => Neutral
8 to 14 => Basic
From the question given above,
The pH of the blood reads between 7.35 and 7.45.
This simply implies that the human blood is slightly basic as the pH reading of the blood is a little above the neutral mark (i.e 7) of the pH scale.
Therefore, Option C. slightly basic. gives the correct answer to the question.
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Which substance would be able to pass through filter paper when added to water?
Answer:
The salt and water will pass through the filter paper while the large, undissolved pieces of sand will be trapped by the filter paper. The liquid that passes through the filter paper and is collected in the beaker is called the filtrate.
Explanation:
If you look on google it will give you the answer: Salt.
What is a solute?
A) what you have the most of
B) usually water
C) the stuff doing the dissolving when making a solution
D) the stuff being dissolved when making a solution
Answer:
D
Explanation:
the stuff being dissolved when making a solution
it is dissolved in the solvent
is this reaction balanced.
Answer:
What reaction is balanced
True of false: The land absorbs more energy from the sun than the water does.
Answer: True
Explanation:
Land surfaces absorb much more solar radiation than water. This is due to the fact that most land surfaces are darker than water which of course means more absorption of solar radiation and heat.