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Answer: C
Explanation:
I would look it up on safari just to be safe tho
Read the sentence.
The same amount of matter exists before and after the change — none is created or destroyed.
How does this sentence contribute to the article's main idea?
A
It defines what is meant by the phrase "chemically the same."
B
It defines the concept of conservation of matter.
C
It explains why changing matter is important.
D
It explains that atoms have been around for a long time.
Answer:
B
It defines the concept of conservation of matter.
Explanation:
calculate the number of oxygen atoms in a 90.0g sample of vanadium(v) oxide v2o5. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits
90.0 g of vanadium (V) oxygen sample has 1.50 x 10 24 oxygen atoms.
To determine the number of oxygen atoms in a vanadium oxide sample, the following steps must be made.
Step 1: Convert the mass of vanadium(V) oxide to mol of vanadium(V) oxide
mol vanadium(V) oxide = mass / molar mass
mol vanadium (V) oxide = 90.0 g / 181.88 g/mol
mol vanadium (V) oxide = 0.49483 mol
Step 2: Convert mol of vanadium (V) oxide to moles of oxygen using mole ratio
mol oxygen = mol vanadium (V) oxide * mole ratio O / mol V2O5
mol oxygen = 0.49483 mol * 5 mol O / mol V2O5
mol oxygen = 2.47416 mol O
Step 3: Convert to oxygen atoms using Avogadro's number
atoms oxygen = mol oxygen * 6.02214 x 10 23 atoms O /mol O
atoms oxygen = 2.47416 mol O * 6.02214 x 10 23 atoms O/mol O
atoms oxygen = 1.48997 x 10 24 atoms or 1.50 x 10 24 atoms O
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_Fe +_02 → _Fe2O3
Answer:4,3,2
Answer:
4Fe+3O2------>2fe2O3
Explanation:
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What gas is this?
Formula: CO
Molar mass: 28.01 g/mol
Boiling point: -312.7°F (-191.5°C)
Density: 1.14 kg/m³
Answer:
Carbon Monoxide
Explanation:
Everything you listen matches everything of Carbon Monoxide
If the relative rate of diffusion of ozone as compared to chlorine is 6:3 and further if the density of chlorine is 36 Find out the density of ozone.
Answer:
The density of ozone is 4.24.
Explanation:
The relation between the relative rate of diffusion and density is given by :
[tex]r\propto \dfrac{1}{\sqrt d}[/tex]
The given ratio of the relative rate of diffusion of ozone as compared to chlorine is 6:3.
Let the density of ozone is d₂.
[tex]\dfrac{r_1}{r_2}=\sqrt{\dfrac{d_2}{d_1}} \\\\\dfrac{6}{3}=\sqrt{\dfrac{d_2}{36}} \\\\3=\dfrac{\sqrt{d_2}}{6}\\\\d_2=\sqrt{18} \\\\d_2=4.24[/tex]
So, the density of ozone is 4.24.
Q.2. How does the valency of elements vary in going down a group of the periodic table?
Answer:
The valency does not change going down a group since the bonding behavior is not affected by the core electrons.
What determines the effect of a limiting reagent on the mass of a product? A. The amount of the limiting reagent B. The reactivity of the limiting reagent C. The coefficient of the limiting reagent D. The molar mass of the limiting reagent
Answer: A. The amount of the limiting reagent
Explanation:
Alex
Answer:
A. A p E x Approved
Explanation:
Trust
Why are some amino acids described as essential amino acids?
a.They are the ones most used in the body.
b.They can be stored in the body.
c.They are the only ones needed by the body.
d.They cannot be made by the body.
Answer:
I would say A and D if you can pick two answers. if not then pick D
Answer:
D- They Cannot be made in the body
Explanation:
Just took the test on edge
GUYS PLEASE HELP MEEEE!!! On a hike up a mountain Delilah sees small pieces of rock along the trail, the small pieces look like the rock that the mountain is made from. how did these small pieces of rock break off from the mountain?
1. Wind and rain interacted with the rock breaking it into small pieces
2. The small pieces of rock were formed by earthquakes, tsunamis, and other natural disasters. These disasters were strong enough to break the rock into small pieces
3. Rays from the sun shone down on the rock, and it broke into pieces
4. if anything were left out for a long time, it would break into small pieces
Answer:
2?
Explanation:
Well the rocks can be thrown around or just start breaking down. Sorry if I'm not correct
Answer:
A
Explanation:
Wind and rain interacted with the rock, breaking it into small pieces.
What does the formula ΔH − TΔS determine?
entropy
Le Châtelier’s principle
enthalpy
Gibbs free energy
Why is density a property but mass and volume is not a property?
Answer:
Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.
Explanation:
PLZ help can you find a picture of the IODINE PLANITERY model please help
Answer:
yes I can find a pic of the iodine planetary model
Explanation:
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Density can be described as:
a. how heavy a material is.
b. the amount of matter in a given volume of that
material.
c. the same thing as weight
Answer:
B..........................
How many moles of O2 are required
if 12 moles of CuFeS are consumed?
Answer:
24 moles of oxygen are required.
Explanation:
Given data:
Number of moles of CuFeS = 12 mol
Number of moles of O₂ react = ?
Solution:
Chemical equation:
2CuFeS + 4O₂ → Cu₂S + 3SO₂ + 2FeO
now we will compare the moles of O₂ and CuFeS.
CuFeS : O₂
2 : 4
12 : 4/2×12 = 24 mol
PLEASE just help me!!! Its my last question!!!!
If you add a light bulb to the circuit, the filament in the bulb will resist the flow of electrons and convert energy into_____ and ______.
Question 2 options:
light and heat
energy and matter
electrons and neutrons
electrons and protons
Answer:
Light and heat
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Answer:
Light and Heat
Give the other guy brainiest
Explanation:
Thx for the point though
What does the 2 mean in the formula 5Mg3(PO4)2? There are two elements in magnesium phosphate. There are two molecules of magnesium phosphate. There are two magnesium ions in a molecule of magnesium phosphate. There are two phosphate ions in a molecule of magnesium phosphate.
Answer: In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.
Explanation:
there are two different compounds of sulfur and fluorine. in sf6 , the mass of fluorine per gram of sulfur is 3.55 g f/g s . in the other compound, sfx , the mass of fluorine per gram of sulfur is 1.18 g f/g s .
The value of x is 2 and the formula of compound SFₓ is SF₂.
The Law Of Multiple Proportions was given by Dalton in 1803.
According to this law, when two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.
This law is illustrated by the following example:
Hydrogen combines with oxygen to form two compounds, water, and hydrogen peroxide.
Hydrogen + Oxygen ⇒ Water
2g 16g 18g
Hydrogen + Oxygen ⇒ Hydrogen Peroxide
2g 32g 34g
Here, the masses of oxygen (i.e., 16 g and 32 g), which combine with a fixed mass of hydrogen, bear a simple ratio, i.e., 16:32 or 1: 2.
Similarly, the ratio of the mass of fluorine per gram of sulfur in the two compounds is 1.18/3.55 ≈ 1/3
As the ratio of fluorine in the two compounds is 1:3, then according to the law of multiple proportions, the number of fluorine atoms in SFₓ should be 1/3rd of the number of fluorine atoms present in SF₆ which is 6/3=2.
Thus, the formula of compound SFₓ is SF₂.
Therefore, the value of x is 2 and the formula of compound SFₓ is SF₂.
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HELP NEEDED, ASAP
A sample of a gas occupies 1600 milliliters at 20.0°C and 600 torr. What volume will it occupy at the same temperature and 800 torr? (Use Boyle’s equation)
Select one:
a. 2.02 ×10^3 ml
b. 1.00 ×10^3 mL
c. 1.45 ×10^3 mL
d. 1.20 ×10^3 mL
Answer:
d. 1.20 ×10^3 mL
Explanation:
That is the answer have a wonderful day!!
Answer:
im ocean nice to meet u mariam
Explanation:
Fill in the blank with the correct vocabulary word: H20 (1) --> H2 (g) + O2 (g) Water is the and hydrogen gas is the
Answer:
Water is reactant and hydrogen gas is product
Explanation:
Information from a Material Safety Data Sheet (MSDS) for hydrochloric
acid is provided below. Which section shown on the MSDS lists a physical
property of hydrochloric acid?
HCI: HYDROCHLORIC ACID
Description: Light yellow clear solution mixed with water. This acid
has a very low pH. It has a melting point of -46°C and a boiling point
of 85°C.
Hazards: Corrosive to skin and eyes. May be harmful when vapors
are inhaled, or when acid is ingested.
Reactivity: Highly reactive with metals to produce hydrogen gas.
Flammability: Not flammable
___________________________
•A. Description
* 5 points
OB. Hazards
OC. Reactivity
D. Flammability
Answer:
a give physical properties of hcl because there is no chemical reaction ph , colour , melting &boiling point are physical properties
The description section shows a physical property of hydrochloric acid on the MSDS lists. The correct answer is option A.
A physical property is a characteristic of matter that can be observed or measured without changing the substance itself. Examples include color, shape, density, and melting point.
MSDS stands for Material Safety Data Sheet. It is a document that provides information about the potential hazards of a chemical substance, as well as instructions for:
handling, storage, and disposal.Therefore, on MSDS list, description section shows a physical property of hydrochloric acid. Option A is the correct answer.
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How much volume in liters would 223.5 grams c6h6 has occupy?
Answer:
166.4
Explanation:
This is due to the act 1 mol of gas takes up 22.4 liters of space. so 223.5/30.5
(30.5 is molecular weight of the gas) =7.4mols x 22.4 L = 166.4
Scenario: (This is for questions 7-12)
One January day when it was 10 degrees F outside, an Uncle went to Safeway to collect a bouquet of balloons for his nieces birthday. He ordered a mix of latex balloons in various colors. He appreciated the warmth of the store. He watched the balloons get inflated and noticed they were full and taut with Helium. He took the balloons home. When he got to his nieces' house he noticed the balloons were sunk in and wrinkled and floating ½ way down to the floor of his car. He was so disappointed. He placed them in the back room until the party. The house was 74 degrees. The party began an hour later and when he went back into the room to retrieve the deflated balloons, much to his relief, they were full and taut as before. He wondered what could have caused this reversal?
Question:
What is your hypothesis as to why the Uncle saw these changes in the balloons?
A car travels 300 miles in 5 hours. How long does it take for the car to travel 82 miles?
Answer:
5 hours is 300 minutes so it goes 1 mile per minute. So 82 minutes = 1 hour and 22 minutes.
Explanation:
So if the car goes 1 mile every minute to reach 82 miles you have to
1 x 82 = 82 minutes converted into hourse = 1 hour and 22 minutes :)
You are given 52 grams of water. What volume container do you need to hold all the water? (Density of water = 1.0 g/mL)
Answer:
52 ml water is present so we need any container more than 52 ml
Explanation:
Density = mass / volume
Volume= mass/ density
52/1= 52 ml
Write a ""lifeline"" of a robin over the first year of its life. Include important events.
Explanation:
Robins are born in the spring or summer and are mature birds and ready to breed in the following spring or summer. They do not mate for life. Pairs usually remain together during an entire breeding season, which can involve two or three nestings.
Since leaving the nest (fledging), it takes another 10-15 days for babies to become good fliers and individual birds. The parents continue to feed their young throughout this time.
What is a molecular geometry
Answer:
Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.
Hope this helps :)
SCIENCE Match Term Definition Chromosphere A) The central and hottest section of the sun Convective zone B) Layer of the sun where energy is transferred by convection Core C) Layer of the sun that is known for its red color and can only be seen during eclipses Radiative zon D) Layer of the sun where energy is transferred by thermal conduction
The correct match of each term with its definition is as follows:
Core: The central and hottest section of the sunConvection zone: The layer of the sun where energy is transferred by convectionChromosphere: The layer of the sun that is known for its red color and can only be seen during eclipses Radiative zone: The layer of the sun where energy is transferred by thermal conductionWhat are the parts of the sun?The sun is a star that the Earth revolves around and from which it receives light and warmth. The parts in the sun are as follows:
The core is the center and the hottest region where the nuclear fusion reactions that power the Sun occur.The convection zone is the layer of the sun which energy travels by convection from the radiative zone to the photosphereThe radiative zone is the layer of the sun which energy is transferred away from the core by radiation.Chromosphere is the reddish extension of the sun's atmospheric envelope between the corona and the photosphere.Learn more about sun at: https://brainly.com/question/17376727
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Answer:
Chromosphere = C) Layer of the sun that is known for its red color and can only be seen during eclipses.
Convective zone = B) Layer of the sun where energy is transferred by convection.
Core = A) The central and hottest section of the sun.
Radiative zon = D) Layer of the sun where energy is transferred by thermal conduction.
Explanation:
I got right on test!
Trust me!
The number of grams in 2.56 x 1025 molecules of HCl are
Answer:
1569.5g
Explanation:
Given parameters:
Number of molecules = 2.56 x 10²⁵
Unknown:
Mass of HCl = ?
Solution:
To solve this problem, let us find the number of moles first;
Number of moles = [tex]\frac{number of particles}{2.56 x 10^{25} }[/tex]
So,
Number of moles = [tex]\frac{2.56 x 10^{25} }{6.02 x 10^{23} }[/tex] = 0.43 x 10² = 43mol
Now;
Mass of HCl = number of moles x molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Mass of HCl = 43 x 36.5 = 1569.5g
How many moles are there in 3.04 X 10^23 molecules of hydrogen, H2, gas?
Answer:
1 mole=6.023×10^23 molecules
3.04×10^23 molecules× value of 1 mole
Explanation:
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According to the concept of Avogadro's number, there are 0.504 moles in 3.04×10²³ molecules of hydrogen.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole has 6.023×10²³ molecules , thus, 3.04×10²³ molecules of hydrogen will have 3.04×10²³ /6.023×10²³=0.504 moles.
Thus, there are 0.504 moles in 3.04×10²³ molecules of hydrogen.
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