Which is the best explanation of why heat is released when
wood burns?
Select one:
A. Burning releases energy stored in chemical bonds.
B. Burning creates energy by increasing particle motion.
C. Burning destroys matter and creates energy from it.
D. Burning causes convection currents which create heat energy.
Using the empirical formula, calculate the formula weight of the compound. Use the periodic table to help you.
Type the correct answer in the box. Round your answer to three decimal places.
Answer:
The formula weight of the compound is
46.069 g/mol.
Explanation:
Determine the molar mass from the empirical formula (C2H6O) by multiplying the molar mass of each element in the compound by the number of atoms of it and adding the resulting masses of the elements:
molar mass of C2H6O = (2 × 12.011 g/mol) + (6 × 1.008 g/mol) + (1 × 15.999 g/mol) = 46.069 g/mol.
Light travel in __________ lines until reflected or refracted .
Answer:
Light travel in _____straight_____ lines until reflected or refracted
How many molecules are in 0.25 mole of CO?
1.5 x 10 to 23rd power
Heeeeeellllppp, Iiiimmm sssooo stttuuuccckkk!
Answer:
I think it would be D. None of the above
Explanation:
why I think this is because none of the answers really adds up to it
The transfer of pollen grains from another of a male to the stigma of female flower
Answer:
pollination is the proces called
What is known as the downhill movements of masses of rock and soil?
A. Mass wasting
B. weathering
c. giant erosions
Answer:
b
Explanation:
Answer:
Gravity drives all mass wasting.
Explanation:
hi please help, i will give 100 points
Explanation:
Boiling water:water heats up and bubbles physical change
Baking a cake: starts to cook into bread chemical change
Burning wood: turns into ash and burned wood chemical change
Painting a door: door changes color physical change
Answer:
water is yummy
Explanation:
What are the elements in group 1 of the
periodic table called?
Answer:
there called alkali metals
Answer:
alkali metals.
Explanation:
Group 1A (or IA) of the periodic table are the alkali metals: hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
What can describe the form of precipitation
Do you have a picture/answer choices?
Some forms of precipitation are rain, sleet, snow, and hail, if that's what you were asking for.
How can you measure the volume of an irregular shaped solid?
Answer:
If the object has an irregular shape, the volume can be measured using a displacement can. The displacement can is filled with water above a narrow spout and allowed to drain until the water is level with the tap. As the irregular object is lowered into the displacement can, the water level rises.
Explanation:
how do i word a formal letter to a teacher saying i didn't pay attention during the science lessons and i now have no idea what to do? by the way, this is on edge so i haven't been on a call, or met my teacher in person.
Explanation:
Hello mr/mrs (name) I unfortunately couldn't pay attention to the class due to some issues I had therefore I don't know what we are doing in class
OR
Hello mr/mrs (name) I could understand what we were doing in class I would like it if you could break it down more or explain better to me
OR just say something it had something to do with your internet such as
Hello mr/mrs (name) I didn't understand what you were saying during our class due to some of my internet issues I was have throughout the day. I hope you can explain what we did during the class.
Those may be some of my excuses I've used before
they have worked for me:)
I don't know if that helped?:/
1. Find the mass of 0.89 mol of CaCl2.
Answer:
97.9
Explanation:
m= n*M
M CaCl2= 40+ 35.5*2= 110
m= 0.89*110= 97.9
The mass of the given mole of [tex]CaCl_2[/tex] is required.
The mass of the given compound is 98.78 g.
Molar mass of [tex]CaCl_2[/tex]
[tex]M=40.078+35.453\times 2=110.984\ \text{g/mol}[/tex]
n = Number of moles = 0.89 mol
Mass is given by
[tex]m=Mn\\\Rightarrow m=110.984\times 0.89\\\Rightarrow m=98.78\ \text{g}[/tex]
The mass of the given compound is 98.78 g.
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Can someone pls help me?
Answer:
17
Explanation:
what is the independent variable
Skill and
Serina is a ballet dancer. During her dance, she dances in a "Z" pattern on the stage. It takes her about 30 seconds to
complete the ®Z." The top and bottom of the "Z" are equal distances of about 3 meters each. The middle part of the "Z"
is about 6 meters long. How quickly (in meters per second) is she traveling during this part of the dance?
Answer:
2.5 m/s
Explanation:
total of 12 meters in 30 seconds
12x2.5=30
How does ocean currents affect climate i need it in 8 sentences.
Solid iron pellets are heated, melted and drawn into wires. This is an example of a chemical reaction
True
False
Answer:
false
Explanation:
It is a physical reaction because it is being heated.
Answer:
False
Explanation:
Just because the iron was melted into wires does not mean that it isn't iron. It is still iron just in a different form.
About how old is the Sun?
1.2 billion years
4.6 billion years
6.4 billion years
8.2 billion years
Answer:
B : 4.6 billion years
Credits go to the person above me.
;)
Explanation:
EDGE 2021
The sun is about 4.6 billion years old. Therefore, option (B) is correct.
What is the sun made of?The Sun is made primarily of the elements hydrogen and helium. They account for 74.9% and 23.8% mass of the Sun in the photosphere. All heavier elements, called metals account for less than 2% of the mass, with oxygen (<1%), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant.
The hydrogen and helium in the Sun would have been produced by Big Bang nucleosynthesis and the heavier elements were produced by former generations of stars before the Sun was formed.
The amount of helium and its location within the Sun has gradually changed over the past 4.6 billion years. The proportion of helium has raised from about 24% to 60% due to fusion, and some of the He and heavy elements have settled from the photosphere toward the center due to gravity.
Therefore, the age of the sun is about 4.6 billion years.
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Aluminum has metallic bonds between its atoms. Which statement BEST describes the
valence electrons in aluminum?
are exchanged with nonmetal atoms
are exchanged with other metal atoms
are localized and stay between metal atoms
are delocalized and move between metal atoms
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
are delocalized and move between metal atoms
Explanation:
As the problem says, aluminum has metallic bonds. The main characteristic of metallic bonds is that the electrons are free to move between the metal ions (they are delocalized), thus being responsible for the good electrical conductivity of metals.
i need help asap :( i’ll give you brainliest
Answer:
a.0.837 moles of silver phosphate
b. 14.55
c. 2.61
Explanation: it is all about the molar ratio so the numbers of front of the molecular formulas there is a 3 in front of the silver nitrate and the other 2 we are asked abuoit have no number so that is a 1 so you are multiplying or dividing by that ratio whichever way you go
A sample of xenon gas occupying 10.0 mL is collected in a laboratory at 27°C and 1.25 atm. What is the volume of the gas at standard conditions?
what is an example of a combustion reaction
if possible, can it come with an explanation pls
Answer:
An example of a combustion reaction is the burning wood in a fire.
Explanation:
In the combustion reaction, the carbohydrates in wood combine with oxygen to create water and carbon dioxide. This reaction is very energetic, and it generates heat and light as it releases said energy.
Hope this helps! Have a nice day! (And please mark me brainliest)
Glycerine is viscous than water?why
Answer:
Yes
Explanation:
Why is glycerol more viscous than water?
The glycerine is more viscous than water because due to presence of hydrogen atoms , we all know that glycerine has more hydrogen bonding than water molecule , which makes an aggregation which means that glycerine is more viscous than water , in simple words glycerine can't flow as that of water molecule.
Boyles Law-
Variables that change:
Variables that remain constant:
Charles Law-
Variables that change:
Variables that remain constant:
Answer:
Boyles Law-
Variables that change: volume and pressure
Variables that remain constant: Temperature
Charles Law-
Variables that change: volume and temperature
Variables that remain constant: pressure
Explanation:
The moon stays in orbit around the Earth because of the Earth's
Answer:
Gravity
Explanation:
what word means to bend light rays toward each other
what is a rule for determining the mass number of an atom or ion
Answer:
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.
sorry if im wrong
Explanation:
4. Which chemical formula below contains 2
different elements?
A. CO
B. Fe2O3
C. C2H4
D. All of the above
The chemical formula of CO, Fe₂O₃, and C₂H₄ contain atoms of two different elements. Therefore, option (D) is correct.
What is the chemical formula?A chemical formula provides information about the chemical proportions of atoms of each element that are present in a molecule or chemical compound. The chemical formula can be represented by using chemical symbols of elements, numbers (subscripts), and other symbols, such as commas, dashes, brackets, and plus (+) and minus (−) signs.
A chemical formula of a compound has no words but can be written in certain simple chemical structures. Chemical formulae can be more limited in power than chemical names and structural formulae. There are two kinds of chemical formulas in which one empirical formula and another molecular formula.
In the chemical formula of carbon monoxide (CO) has carbon and oxygen two different elements. In the chemical formula of iron oxide (Fe₂O₃) iron and oxygen are two different elements. In the chemical formula of ethane (C₂H₄ ) has carbon and hydrogen two different elements.
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What ion does sodium (Na) form
A soccer player applies a force of 56.6 N to a soccer ball while kicking it. If the ball has a mass of 0.46 kg, what is the acceleration of the soccer ball?
Answer:
[tex]a=123.04\ m/s^2[/tex]
Explanation:
Given that,
Force applied to a soccer player, F = 56.6 N
The mass of the ball, m = 0.46 kg
We need to find the acceleration of the soccer ball. The force acting on the ball is given by :
F = ma
Where
a is the acceleration
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{56.6 }{0.46 }\\\\a=123.04\ m/s^2[/tex]
So, the required solution is [tex]123.04\ m/s^2[/tex].