Answer:
q 3 c q 2 d
Explanation:
how many moles is ( 1 x 10^9 ) molecules O2
Answer:
The answer is
[tex]1.66 \times {10}^{ - 15} \: \: moles[/tex]
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1 \times {10}^{9} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
[tex]1.66 \times {10}^{ - 15} \: \: moles[/tex]
Hope this helps you
Scientists use patterns in the periodic table to what?
how is sonoluminescence similar to what we see in fireworks?
Answer:
Explanation:
Sonoluminescence is a phenomenon in which small gas bubbles burst to produce light when intense sound wave is introduced. Thus, it can be said that sound energy is converted to light energy here. This is similar to the process of how fire crackers work except that sonoluminescence occurs in a liquid medium while firecrackers work in solid media. In firecrackers, when the tip is lit with fire, the initial explosion is caused by the expansion of some nitrogen and carbon present in some constituent compounds, this explosion produces heat which causes some other constituent chemicals in the firecracker to quickly react and produce light. Thus, this can also be said to convert sound energy to light energy and are thus similar to what occurs in sonoluminescence.
A 25-N net force is applied to a rolling cart and produces an acceleration of 5 m/s2 . What is the cart’s mass?
Answer:
5kg
Explanation:
Given parameters:
Force = 25N
Acceleration = 5m/s²
Unknown:
Mass of cart = ?
Solution:
Based on newton's second law of motion;
Force = mass x acceleration
Now to find the mass;
Mass = [tex]\frac{force}{acceleration}[/tex]
Now insert the parameters and solve;
Mass = [tex]\frac{25}{5}[/tex] = 5kg
Suppose that green spheres represent chlorine atoms, yellow-green spheres represent fluorine atoms, white spheres represent hydrogen atoms, and all the molecules are gases
Answer:
a. Reactants: F₂ and HCl molecules
Products: Cl₂ and HF
b. 4HCl + 2F₂ ----> 4HF + 2Cl₂
c. Single replacement reaction
Note: The question is not complete. The complete question is found below as well as in the attachment.
Suppose that green spheres represent chlorine atoms, yellow-green spheres represent fluorine atoms, white spheres represent hydrogen atoms, and all the molecules are gases:
a. write a formula for each of the reactants
b. write a balanced equation for the reaction
c. indicate the type of reaction as combination,decomposition, single replacement, double replacement, or combustion
Explanation:
a. From the models shown in the diagram, The reactants are F₂, HCl while the products are Cl₂ and HF respectively
b. Equation for the reaction is given below;
4HCl + 2F₂ ----> 4HF + 2Cl₂
c. The reaction is single replacement reaction such that fluorine gas molecules replace the chlorine atoms in hydrogen chloride to form hydrogen fluoride with the liberation of chlorine atoms as gaseous molecules.
Which of the following is a subsurface event that takes place during the rock cycle?
Group of answer choices
Cementing
Erosion
Melting
Weathering
Answer:
Melting
Explanation:
Could not have been erosion because erosion happens on the surface.
Could not have been weathering because weathering happens on the surface.
So we only have Cementing and Melting left....
The answer is melting, I got 100% on my test.
Hope this helps!!!! :D
Please give brainliest!!!
Answer:
D
Explanation:
In the rock cycle, surface events takes place at the surface of earth. Thus,
weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.
7th grade help me plzzzzzzzzzz
Activity 7: Crossword Puzzle
Directions Complete the crossword by filling in the word that describes each clue.
Answer:
Across
2. Conduction.
3. Plates
4. Convection
5. Subduction
7. Earthquake
Down
1. Radioactive
6. Radiation
8. Sink
9. Slabpull
The clues are;
Across:
2. air molecules come in contact with warmer molecules
3. crust are made up of puzzle - like landmass called_____
4. rising and falling movement of material in the mantle
5. when tectonic plates push with each other
7. it is the result of movement of earth's plate
Down:
1. elements that play a vital role in Earth's internal heat
6. least important mode of heat transport
8. warm material rise; cool material______
9. heats build up underneath the crust
a glass of water with a mass of 0.35 kg rests on the edge of a desk 0.85 m above the floor given that the acceleration due to gravity is 9.8 m / s² what is the elastic potential energy
Answer:
2.92
Explanation:
just took the test
In a chemical reaction 300 grams of reactant A combined with 100 grams of reactant B both A and B react to completion what is the mass of the product?
1. 200
2. 300
3. 400
4. It cannot be determined given the information
Answer: 1.2
Explanation:
What is one measurement needed to calculate the speed of an object?
Answer:Speed is the rate at which an object's position changes, measured in meters per second. The equation for speed is simple: distance divided by time. You take the distance traveled (for example 3 meters), and divide it by the time (three seconds) to get the speed (one meter per second).
Explanation:
Answer:
What is one measurement needed to calculate the speed of an object
Explanation:
Glycerol has a density of 1.26g/mL. What is the mass of 3000.mL of glycerol?
Copernicus challenged the way in which people of his time thought about the solar system. How did Copernicus describe the motion of the sun?
A.The sun is stationary.
B.The sun revolves around Earth.
C.The sun moves in an elliptical orbit.
D.The sun moves in a straight line through space.
Answer:
A. The sun is stationary and we rotate around it.
Hope This Helps!
Answer:
A
Explanation:
the sun is stationary
Question 6 (1 point)
Sound, earthquakes, and waves in water are rechanical waves because they require
a physical to transport energy. (Lesson 4.02)
O electromagnetic field
O disturbance
O medium
location
Answer: The answer is MEDUIM
Explanation:
How do tectonic plates move at convergent subduction boundaries? Insert a drawing with the arrows that show the movement
Answer:
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. ... As the sinking plate moves deeper into the mantle, fluids are released from the rock causing the overlying mantle to partially melt.
When the dry ingredients of a cake are combined, what is the result? A.Element B.Mixture C.Compound D.Atom
A combination of dry ingredients of a cake results in a mixture.
A mixture is a combination of substances that are only physically but not chemically combined.
Mixtures are different from elements, compounds, and atoms because:
elements are pure substances consisting of a single type of atomcompounds are a mixture of different elements that are chemically combinedatoms are the smallest particle of an element.More on mixtures can be found here: https://brainly.com/question/24898889?referrer=searchResults
Answer:
Its mixture
Explanation:
Pls give me brainly ...
I need help please （o´・ェ・｀o）
Tantalum: 2
Niobium: 3
Dubnium: 1
Please make brainliest ?
A student builds an electrical circuit. In the circuit, a
battery is connected to a siren.
Which series of energy transformations takes place in the circuit when the
siren turns on?
A. Chemical energy - Sound energy - Electrical energy
O B. Electrical energy - Chemical energy - Sound energy
C. Chemical energy - Electrical energy - Sound energy
O D. Sound energy - Electrical energy - Chemical energy
Answer:
C. Chemical energy - Electrical energy - Sound energy
Explanation:
According to the law of conservation of energy, energy can be transformed i.e changed from one form to another. According to this question, a student builds an electrical circuit, which connects a battery to a siren. Based on this description, the electrical circuit uses ELECTRICAL ENERGY supplied by the CHEMICAL ENERGY in the battery cell.
The electrical energy in the circuit connects the CHEMICAL ENERGY in the battery to the siren, which makes the sound using SOUND ENERGY. In other words, the CHEMICAL ENERGY of the battery powers the ELECTRICAL ENERGY of the circuit to make SOUND ENERGY in the siren. Hence, the order of energy transformation is: Chemical energy - Electrical energy - Sound energy
Answer:
C. Chemical energy - Electrical energy - Sound energy
Explanation: I took the test:)
A car engine creates a 2940 N
force on a 1520 kg car. If there
are no other forces, what is the
acceleration of the car?
Answer:
The answer is 1.93 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a= \frac{2940}{1520} = \frac{147}{76} \\ = 1.934210...[/tex]
We have the final answer as
1.93 m/s²Hope this helps you
What is true about atoms when they bond? There may be more than one answer.
1. Bonded atoms can never be taken apart
2. Electrons can be transferred
3. They form compounds
4. Compounds have the same characteristics are the atoms that make it up
5. Electrons can be shared
Answer:
3. 5. and i think thats it
Answer:
3. 5. and i know it is right
Explanation:
14. Which of the following groups is most at risk for developing this disease?
a) children born to mothers with dark skin, living far from the equator
b) adults with dark skin who live close to the equator
c) children born to mothers with light skin who live close to the equator
Answer: c
Explanation: built different
What are the coefficients that would correctly balance this equation? __Zn+__K2CrO4 > __K + __ZnCrO4
A. 2,1,2,1
B. 1,2,3,1
C. 1,2,1,2
D. 1,1,2,1
Can someone please help
D. 1,1,2,1
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction(unbalanced)
Zn+K₂CrO₄ ⇒ K + ZnCrO₄
Give coefficient
aZn+K₂CrO₄ ⇒ bK + cZnCrO₄
Zn, left=a, right=c⇒a=c
K, left=2, right=b⇒b=2
Cr, left=1, right=c⇒c=1⇒a=1
O,left=4,right=4c⇒4c=4⇒c=1
Reaction(balanced0
Zn+K₂CrO₄ ⇒ 2K + ZnCrO₄
Are ionic compounds not carrying a charge?
Answer:
yes they carry charges
How long does it take for new fossil fuels to be created?
A.millions of years
B.billions of years
C. thousands of years
D. hundreds of years
Answer:
millions of years sometimes even hundred of millions of years
Answer:
How long does it take for new fossil fuels to be created?
Explanation: so it takes 65 million years to creat new fossil fuels so i think it may be A.millions of years i am sorry if i am wrong but i do beleave i am right
What term is used for the electrons in the outermost shell or energy level
Answer:
Valence Electrons
Explanation:
Answer:
Valence
Explanation:
The outermost shell are the valence electrons
As the number of protons increases but the distance between the protons and electron REMAINS THE SAME...
O the electronegativity stays the same.
O the electronegativity decreases.
O the electronegativity increases.
Answer:
The correct option is;
The electronegativity increases
Explanation:
The electronegativity is the measure of an atom's ability to attract a shared electron pair. The electronegativity of an atom is dependent on the atom's atomic number and the separation distance between the electrons in the valence shell and the positively charged nucleus such that an increase in the atomic number results in an increase in electronegativity and an increase in the distance between the valence electrons and the nucleus, leads to a decrease in electronegativity.
methanol on reaction with acetyl chloride gives
Answer:
Explanation:
Ethanoyl chloride reacts instantly with cold ethanol. There is a very exothermic reaction in which a steamy acidic gas is given off (hydrogen chloride). Ethyl ethanoate (an ester) is formed.
Will give extra points and brainliest if you go in the comments and answer a few other questions
Answer:
5,293 km, A
Explanation:
B has no coma.
C is too overly touchy
Answer:
b
Explanation:
Methanol, propan-1-ol and ethanol has boiling point of 65 degree celsius, 97 degree celsuis, 87 degree celsuis respectively. A student uses fractional distillation to separate a mixture of these compound. State which liquid will be collected in the second fraction and explain why
Answer:
ethanol
Explanation:
Methanol has a boiling point of 65°C, propan-1-ol has a boiling point of 97°C and ethanol has a boiling point of 87°C
Fractional distillation is used for separating miscible liquids through the use of the different vapor pressure properties of the liquids. As the mixture is heated up, components start to vaporize according to their boiling points. The component with the least boiling point vaporizes first while the component with the highest boiling point vaporizes last.
This means that methanol would vaporize at the first fraction because it has the lowest boiling point followed by ethanol at the second fraction and then propan-1-ol at the last fraction.
Convert 2.5 x 102km to mm.
Convert 188 dL to L