Answer:
Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.
Explanation:
Hope this helps
Use the reaction below for the decomposition of sodium azide
to sodium metal and nitrogen gas.
2NaNg(s) + 2Na(s) + 3N2(g)
What volume of nitrogen at STP is generated by the decomposition of 130.0 g NaNz?
Answer: The volume of nitrogen gas at STP is 44.8 L.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation for it follows:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ...(1)
We are given:
Given mass of [tex]NaN_3[/tex] = 130.0 g
Molar mass of [tex]NaN_3[/tex] = 65.01 g/mol
Using equation 1:
[tex]Moles of NaN_3=\frac{130.0 g}{65.01g/mol}=2mol[/tex]
For the given chemical equation:
[tex]2NaN_3(s) \rightarrow 2Na(s) + 3N_2(g)[/tex]
By the stoichiometry of the reaction:
2 moles of [tex]NaN_3[/tex] produces 3 moles of nitrogen gas
At STP:
1 mole of a gas occupies 22.4 L of volume
So, 2 moles of nitrogen gas will occupy [tex]=\frac{22.4L}{1mol}\times 2mol=44.8L[/tex] of volume
Hence, the volume of nitrogen gas at STP is 44.8 L.
How many mL of a 2.0 M CuCl2 solution are needed to make 500 mL of a 0.5 M solution?
Answer: There is 125 mL of a 2.0 M CuCl2 solution are needed to make 500 mL of a 0.5 M solution
Explanation:
Given: [tex]M_{1}[/tex] = 2.0 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 0.5 M, [tex]V_{2}[/tex] = 500 mL
Formula used to calculate the volume is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\2.0 M \times V_{1} = 0.5 M \times 500 mL\\V_{1} = 125 mL[/tex]
Thus, we can conclude that there is 125 mL of a 2.0 M [tex]CuCl_{2}[/tex] solution are needed to make 500 mL of a 0.5 M solution.
Which of the following do not contribute to weathering?
A. Rain
2.earthquakes
3. ice
4. wind
Answer:
Earthquakes
Explanation:
why methane and silicon dioxide have different melting point
Answer:
Methane is made up discrete molecules hence it adopts a simple molecular structure with weak vanderwaals forces of attraction while Silicon dioxide adopts a giant covalent structure with strong silicon to oxygen bonds.
Hence Silicon dioxide has a high melting point than methane.
what is the chemical formula for zinc?
Chemical properties of matter depend mostly on what?
Answer:
the types of atoms and bonds that a substance contains
Explanation:
Answer:
the types of atoms and bonds that a substance contains
Explanation:
Consider the statement, “In a chemical reaction, atoms are neither created nor destroyed, only rearranged.” Why is this a statement of the law of conservation of mass?
Answer: The law of conservation of mass is reffering to the fact that energy cannot be created or destroyed. So when you speak about atoms not being created or destroyed it is the same thing. Unless you're talking about an atomic bomb where the atoms are split.
In a chemical reaction, the total mass present is equal to the mass of all the atoms undergoing the reaction.
According to the law of conservation of mass, mass is neither created nor destroyed but can be converted from one form to another. In a chemical reaction, atoms are rearranged. However, the total number of atoms in the system remains constant.
So, the total mass present in the system is equal to the mass of all the atoms undergoing the reaction. Since atoms are only rearranged, no new atom is formed and no atom disappears in the reaction, the total mass of the system remains constant.
For this reason, the statement; “In a chemical reaction, atoms are neither created nor destroyed, only rearranged" is a statement of the law of conservation of mass.
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3
Please select the word from the list that best fits the definition
a narrow body of water with land on both sides
Athens
Answer:
Strait.
Explanation:
After a fast online search, I've found that the list of words are:
Athens
Age of Pericles
satraps
tyrant
Cyrus the Great
hoplites
Parthenon
peninsula
upper-class Athenian women
strait
Well, the definition is:
"A narrow body of water with land on both sides"
This is something like a river, so we need to find which one of these words means something like river.
To do it, let's look at short definitions of each word:
Athens: This is the capital city of Grece. (Isn't the correct option)
Age of Pericles: This refers to a historical period (isn't the correct option)
Satraps: Were governors in the Persian empire (Isn't the correct option)
Tyrant: Refers to a cruel leader (Isn't the correct option)
Cyrus the Great: Was the founder of the Achaemenid Empire (isn't the correct option)
Hoplites: A citizen-soldier (isn't the correct option)
Parthenon: A construction in Grece (isn't the correct option)
Peninsula: A small body of land surrounded mostly by water, but connected to land (isn't the correct option)
upper-class Athenian women: It is self-explained, this isn't the correct option.
Strait: This refers to a narrow passage of water that connects two larger areas of water (like two seas, for example)
Then this one is the correct option.
what is the molerity of 4grams of sodium chloride in 3.800ml solution
a) 0.018 M
b) 0.018 Mol
c) 1.052 M
d) 1.052 Mol
Answer: 0.018 M
Explanation:
If the temperature and amount of gas stays constant, what will happen to the pressure of a gas if the volume of the container decreases?
what are binory compounds
Answer:
You meant binary compounds ryt?
Then,
Binary compounds are chemical compounds comprising of two distinct elements
If the chemist mistakenly makes 250 mL of solution instead of the 200 mL, what molar concentration of sodium nitrate will the chemist have actually prepared? Answer in units of M.
Answer:
0.120M is the concentration of the solution
Explanation:
Assuming the mass of sodium nitrate dissolved was 2.552g
Molar concentration is an unit of concentration widely used in chemsitry defined as the moles of solute (In this case NaNO3) in 1L of solution.
To find this question we must find the moles of NaNO3 in 2.552g. With this mass and the volume (250mL = 0.250L) we can find molar concentration as follows:
Moles NaNO3 -Molar mass: 84.99g/mol-
2.552g * (1mol / 84.99g) = 0.0300 moles NaNO3
Molar concentration:
0.0300 moles NaNO3 / 0.250L =
0.120M is the concentration of the solutionEnergy 1:Question 3
Maria walked on a beach made mostly of sand. She walked
barefoot on the beach early in the morning, and the sand was
cool. When she walked in the same area in the afternoon, the
sand was hot. Which statement best describes why the
temperature of the sand increased?
Select one:
The atoms in the sand were moving more quickly.
Answer: The statement, atoms in the sand were moving more quickly best describes why the temperature of the sand increased.
Explanation:
As Sun rises in the morning everyday and the heat energy radiations given by the Sun falls on a number of objects on our surroundings. As a result, the objects absorb this heat energy till afternoon due to which they become hot.
Hence, atoms of the objects gain kinetic energy due to which they move quickly. This shows that the temperature of the object (sand here) increases.
When Maria walked in the same area in the afternoon, the sand was hot as its particles have gained kinetic energy due to which they move rapidly from one place to another. Hence, sand feels more hot in the afternoon in the same area where she walked.
Thus, we can conclude that the statement the atoms in the sand were moving more quickly best describes why the temperature of the sand increased.
A compound contains 1.2 g of carbon, 3.2 g of oxygen and 0.2g of hydrogen. Find the formula of the compound
Answer:
The empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
Explanation:
We need to determine the empirical formula in its simplest form, where hydrogen ([tex]H[/tex]) is scaled up to a mole, since it has the molar mass, and both carbon ([tex]C[/tex]) and oxygen ([tex]O[/tex]) are also scaled up in the same magnitude. The empirical formula is of the form:
[tex]C_{x}HO_{y}[/tex]
Where [tex]x[/tex], [tex]y[/tex] are the number of moles of the carbon and oxygen, respectively.
The scale factor ([tex]r[/tex]), no unit, is calculated by the following formula:
[tex]r = \frac{M_{H}}{m_{H}}[/tex] (1)
Where:
[tex]m_{H}[/tex] - Mass of hydrogen, in grams.
[tex]M_{H}[/tex] - Molar mass of hydrogen, in grams per mole.
If we know that [tex]M_{H} = 1.008\,\frac{g}{mol}[/tex] and [tex]m_{H} = 0.2\,g[/tex], then the scale factor is:
[tex]r = \frac{1.008}{0.2}[/tex]
[tex]r = 5.04[/tex]
The molar masses of carbon ([tex]M_{C}[/tex]) and oxygen ([tex]M_{O}[/tex]) are [tex]12.011\,\frac{g}{mol}[/tex] and [tex]15.999\,\frac{g}{mol}[/tex], then, the respective numbers of moles are: ([tex]r = 5.04[/tex], [tex]m_{C} = 1.2\,g[/tex], [tex]m_{O} = 3.2\,g[/tex])
Carbon
[tex]n_{C} = \frac{r\cdot m_{C}}{M_{C}}[/tex] (2)
[tex]n_{C} = \frac{(5.04)\cdot (1.2\,g)}{12.011\,\frac{g}{mol} }[/tex]
[tex]n_{C} = 0.504\,moles[/tex]
Oxygen
[tex]n_{O} = \frac{r\cdot m_{O}}{M_{O}}[/tex] (3)
[tex]n_{O} = \frac{(5.04)\cdot (3.2\,g)}{15.999\,\frac{g}{mol} }[/tex]
[tex]n_{O} = 1.008\,moles[/tex]
Hence, the empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
What is the name of P2O in Chemistry?
P2O : Summary
Code P2O
Molecule name 3-PROP-2-YN-1-YL-1,3-OXAZOLIDIN-2-ONE
Synonyms 1-(PROP-2-YNYL)-OXAZOLIDINE-2-ONE
Systematic names Program Version Name ACDLabs 10.04 3-prop-2-yn-1-yl-1,3-oxazolidin-2-one OpenEye OEToolkits 1.5.0 3-prop-2-ynyl-1,3-oxazolidin-2-one
How does increased exhalation of CO2 at the lungs (pulmonary regulation) restore the correct pH range?
Answer:
When CO2 levels become excessive, a condition known as acidosis occurs. This is defined as the pH of the
blood becoming less than 7.35. The body maintains the balance mainly by using bicarbonate ions in the
blood. As the body responds to neutralize this condition, an electrolyte imbalance – an increase of plasma
chloride, potassium, calcium and sodium, can occur.
If the Earth is at a perpendicular angle or right angle to the sun we will be experiencing...??
plz hurry!!
Answer:
angle
Explanation:
let us see the sun moves an a angle
What is concentration if pOH is 8?
A) 1 x 10-8 M
B) 1 x 102 M
C) 1 x 10-2M
D) 1 x 108 M
The answer is A) 1 x 10-8 M.
What is the balanced equation for combustion of copper (I)?
Answer:
Cu + O2 = CuO - Chemical Equation Balancer.The table shows the speed of sound in four substances.
Substance. Speed (meters/second)
air. 330
water. 1,498
steel. 5,000
copper. 6,420
Based on this information, which substance has the lowest density?
O A water
O B. steel
C. copper
O D. air
Based on this information, air has the lowest density. Therefore, the correct option is option D.
What is density?The substance's mass every unit of volume is known as its density. Although the Roman letter D may also be used, the sign most frequently used for density. Density is calculated mathematically by dividing mass by volume.
Where m is the mass, V is the volume, and is the density. Density is sometimes roughly characterized as weight every unit volume, while this is incorrect technically; this quantity is much more precisely known as specific weight. Air has the lowest density.
Therefore, the correct option is option D.
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which organism ( grass, prairie, dog, ferret, or fox) do you think is a producer (does not depend on another organism for its food)?
Answer:
grass
Explanation:
Grass is at the very bottom of the food chain and relies solely on sunlight and water, which aren't organisms. I'm going to assume you meant prairie dog because a prairie isn't an organism, but prairie dogs rely on grass for food. Ferrets rely on meat for food (which they get from other animals) and foxes rely on other animals for food as well. Therefore, grass is the only organism that is a producer (gives other organisms food) and doesn't rely on other organisms for food.
Answer:
Grass
Explanation:
A producer or autotroph is an organism that produces its own food. These include plants, algae, and some bacteria. They convert carbon dioxide, water, and light energy from the sun into glucose, a type of sugar that provides energy, in the process of photosynthesis.
The organisms we are given are grass, prairie dog, ferret, and fox. The only plant is grass. Prairie dogs, ferrets, and foxes are all consumers, and depend on other organisms (plants, grass, leaves, or other animals for meat) for food.
Therefore, the producer in this list is grass.What can be different between the products and reactants in a balanced chemical equation ? A)Total mass
B)Total moles of individual elements
C)Number of molecules D)Types of atoms
In a chemical reaction, the very same atoms were present both in the reactants and products, but they are reorganised as a result of the reaction.
How do reactions take place?Opposition against an influence, force, or movement. preference for an antiquated political, social, and policy system, in particular. a response to a certain process, situation, or stimulus. She was shocked by the information. Substances are made up of chemical compounds and chemical constituents.
What does the word "force" mean?Due to forces, an item will either be in rest or moving. Consider a football that is motionless and resting just on ground as an example.
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Which of these is a polar molecule?
1. SH2
2. CO2
3. F2
Are elements always the product of a decomposition reaction?
The pure form of an atom present in a sample is called the element. No, elements are not always the product of the decomposition reaction.
What is decomposition reaction?Decomposition is a chemical reaction in which the compound or the molecule breaks to produce two or more products. The general reaction can be given as,
[tex]\rm XY \rightarrow X+ Y[/tex]
And,
[tex]\rm compound \rightarrow element + element[/tex]
The splitting of metal hydroxide into the water and metal oxide is an example of a decomposition reaction. Elements can be found in the free state.
Therefore, the statement is incorrect.
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Consider the following physical properties and fill in the missing information.
Answer:
I'm going to assume by "tool", you mean the tool best used to measure each factor:
Mass-Tool: scale, Unit: kilogram (kg)
Length-Tool: ruler, Unit: meter (m)
Volume of a regular solid-Tool: equations (there really isn't a physical tool to measure volume of a solid), Unit: cubic meters (m^3)
Volume of a liquid or irregular solid-Tool: beaker, Unit: Milliliters (mL)
Melting and boiling point-Tool: thermometer, Unit: Celsius (C)
Hope this managed to help!
the 3 factors that affect the process of Natural Selection
Answer:
Overproduction of Offspring. The first of these factors that must be present in order for Natural Selection to occur is the ability of a population to overproduce offspring.
Variation.
Selection.
Reproduction of Adaptations.
Explanation:
What is caffeine atomic number?
No links
Answer:
Caffeine has no atomic number
Explanation:
Caffeine is a compound, not an element. Therefore it cannot have an atomic number.
What part of the stem transports water and nutrients to the rest of the plant?
A) root cells
B) bark
C) xylem
D) phloem
Answer:
C) xylem
Explanation:
which group/family of elements will most likely form ions with a charge of - or 1-?
Answer:
Re: Most likely charge for ions. Group 1 elements generally have a charge of +1 when they form ions, Group 2 has a charge of +2, Group 13 has a charge of +3. Group 17 has a charge of -1, Group 16 has a charge of -2, Group 15 has a charge of -3. So Rb would be +1, Ga would be +3, and S would be -2.
Explanation:
The table below shows the speed of sound waves from musical sound sources at 20°C.
Which conclusion can be made based on the information in the table?
Wave speed and wave lengths can vary inversely to produce the same frequency.
Frequency and wave speed can vary directly to produce the same wavelength.
Wavelengths and frequency can vary inversely to produce the same wave speed.
Frequency and wave speed can vary directly to produce the same wave speed.
Answer:
C
Explanation:
Wavelengths and frequency can vary inversely to produce the same wave speed
Answer:
C) Wavelengths and frequency can vary inversely to produce the same wave speed.
Explanation:
edge