Answer:
CH4 + 2O2 = 2H2O + CO2
Light travel in __________ lines until reflected or refracted .
Answer:
Light travel in _____straight_____ lines until reflected or refracted
Identify the element that can be found in the 5th period and 4th group on the Periodic Table.
As
Zr
Sn
V
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
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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5) A change in the chemical properties of a substance results in _________. *
a change of state
the same substance
a new substance
Answer:
a new substance
Explanation:
because it is chemival
How many moles are in 80.00 g of magnesium hydroxide?
1.37moles
0.73moles
46.64moles
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:
Can someone help me with this
Answer:
i believe the correct answer is "Complete metamorphosis"
Explanation:
(e)
Calculate the mass of one atom of sodium.
Use the equation:
relative atomic mass
mass of one atom of sodium =
Avogadro constant
Avogadro constant = 6.02 x 1023
Give your answer to 2 significant figures
Answer:
3.82 × 10 ^-23 g
Explanation:
6.02 x 10^23atoms = 1 mole of sodium
1 atom = 1/(6.02 x 10^23) mole
mass = mole × molar mass
= 1/(6.02 x 10^23) × 23
= 3.82 × 10 ^-23 g
Thermal energy is added to water to raise the temperature to 250F.
Which of the following models BEST describes the movement of the particles after the thermal energy is added?
Answer:A
Explanation:the water will start to boil representing the yellow particles.
Answer:
A
Explanation:
Lol I'm doing the test right now and I have notes
There are 12 inches in 1 foot and 2.54cm in 1 inch. How many feet are in 325 cm?
Answer:
27.0833 feet
Explanation:
why aren't granite, copper, or petroleum found everywhere on earths surface
Answer: The distribution of natural resources depends upon many physical factors like land, climate and altitude. The distribution of resources is unequal because these factors differ from place to place on this earth.
Many physical factors, such as land, climate, and altitude, influence the distribution of natural resources. Because these factors differ from place to place on this planet, the distribution of resources is unequal.
What is earth surface ?The Earth's surface is defined as the part of the water or land that comes into contact with the air above it. The surface is the part of the Earth with which we interact. The crust is the rock layer that surrounds the Earth's mantle. The crust encircles the entire planet, including the ocean floor.
The crust is the planet's surface, where we live; it's actually a very thin layer, only 70 kilometers thick at its thickest point.
Petroleum is formed by the same geological process that creates sedimentary rock. The geological processes that create rocks and natural resources such as granite and copper do not occur everywhere on Earth and take a long time to form. This explains why granite and copper aren't found everywhere on the planet.
Thus, Because these factors differ from place to place on this planet, the distribution of resources is unequal.
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describe the behavior of the molecules in a liquid. Explain this behavior in terms of intermolecular forces.
The term “INTERmolecular forces” is used to describe the forces of attraction between atoms, molecules, and ions when they are placed close to each other.
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
In a liquid, intermolecular attractive forces hold the molecules in contact, although they still have sufficient KE to move past each other. Intermolecular attractive forces, collectively referred to as van der Waals forces, are responsible for the behaviour of liquids and solids and are electrostatic in nature.
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What ion does sodium (Na) form
WILL MARK BRAINLIEST WConsider two elements. Element A has a low ionization
energy of 500 kJ/mol and element B has a high ionization
energy of 1050 kJ/mol. Which element is most likely to form
a positive ion? [Select ]
In which block would you most likely find Element A?
Select)
In which block would you most likely find Element B?
[Select]
Answer:
the one with the lower ionization energy is more likely to be positive as it is easier to remove the valence electron that causes the positive charge
element a is likely in the s block as that is a low ionization energy and they get larger as you move up and to the R in the table
and element b is likely in the p block for the same reason
Explanation:
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.
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?:/
Should the organism be considered a life-form?
Answer:
It is a synonym for "life form". Organisms are classified by taxonomy into groups such as multicellular animals, plants, and fungi; or unicellular microorganisms such as protists, bacteria, and archaea. ... Fungi, animals and plants are examples of kingdoms of organisms within the eukaryotes.
So yes, it should
Explanation:
Your friend is describing an element that is commonly
found in household materials, malleable, and a good
conductor of heat and electricity. They say it is not very
reactive and is very similar to the other elements in its
group. Your friend's element is most likely which of these?
A. A transition metal
B. A noble gas
C. A halogen
D. An alkali metal
An element that is commonly found in household materials, malleable, and a good conductor of heat and electricity. They say it is not very reactive and is very similar to the other elements in its group as an alkali metal.
What is an alkali metal ?All the elements listed in column 1A of the periodic table—hydrogen, lithium, sodium, potassium, rubidium, cesium, and francium—are classified as alkali metals. The fact that all of these metals contain one electron in their outermost layer of electrons binds them together.
The production of paper, detergents, and soap all need sodium hydroxide. In addition to being used as the electrolyte in alkaline, Ni-Cd, and Ni-MH batteries, potassium hydroxide is also used by farmers to make acidic soil more alkaline so that plants would grow better in it.
Vinegar, hydrochloric acid, and sulfuric acid are a few examples of the H = ion-containing compounds referred to as acids. Alkalis are a class of substances that feel soapy and contain the OH = ion.
Thus, option D is correct.
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6. In photosynthesis, plants use carbon dioxide and water to
produce oxygen and glucose. How many grams of water are
needed to produce 75 grams of glucose?
6 CO2 + 6 H2O → C6H12O6 + 6 O2
a. 45grams
b. 90grams
c. 108 grams
d. 180grams
Think of the different types of reactions you have learned about. How can you tell if they absorb energy or release energy, and at the molecular level, how are they different?
Answer:
Absorbed will be harder to spot than releasing because take this as it's like a tire. A tire will go smaller when it has no air compared to when it has air. But absorbed it the opposite. It gets bigger with more air and etc.
Explanation:
My answer don't copy and paste change it a little.
A popsicle melts on a table. Select ALL statements that are true. A The particles gained thermal energy and changed from a solid to a liquid B The particles lost thermal energy and changed from a solid to a liquid C A physical change occurred D A new chemical substance was made when it melted
Answer:
its "a" nd "C" Big Dawg if im wrong im sorry dawg been a min since i took a test like dis
Explanation:
Order these atoms from the highest to lowest amount of protons.
1. gallium
2. tin
3. potassium
4. barium
5. aluminum
Which of the following represents a polar covalent compound?
O2
CI2
NaCI
H2O
(C.NaCl
it is the correct answer because this compound likes colder weather.
How does ocean currents affect climate i need it in 8 sentences.
Which of the following is the mass in grams of 4.25 × 10³ mol of N2?
Answer:
119,059.5 g/mol
Explanation:
First, find the mass of N2
On the periodic table, nitrogen is 14.007
Because there are two nitrogens, multiply it by 2
14.007*2 = 28.014 g
Now convert... (also don't let that exponent intimidate you! You can change it to 4250 if that makes it easier)
4.25 × 10³ mol * 28.014 g/1 mol = 119059.5 g/mol
PLEASE HELP ASAP IT URGENT!!!!!!!!
Answer: IT IS D
Explanation:
1. Why do scientists study fossils? *
(25 Points)
O a to learn how the planet was formed
O b. to study how organisms changed over time
O c. to observe how drought affected the landscape
O d. to understand how weathering affect rock layers
Write the skeletal formula equation for: solid potassium, K, reacts with
chlorine gas, Cl2, to produce solid potassium chloride, KCI.
Swinging a golf club toward a golf
ball and hitting it off the tee.