Answer:
D
Explanation:
ahh i think,
AHH JUST LET ME SEND ITTT
Answer:
its one type of matter becomes another type of matter
Explanation:
it was that for a p e x
Teresa creates an experiment Washington states to read colored substances together in a container in observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after 8 minutes. What does this represent about the type of change happening in the container
The question is incomplete, the complete question is;
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container? A chemical change started immediately and finished at eight minutes. A non-chemical change started immediately and finished at eight minutes. A chemical change occurred at four minutes. A non-chemical change occurred at four minutes.
Answer:
A chemical change started immediately and finished at eight minutes.
Explanation:
A chemical change is one in which a new substance is formed. One of the indicators that a chemical change has occurred is the change in the color of the system from red to blue.
The question clearly stated that the change occurred gradually. This means that the reaction must have started immediately the substances were mixed and went on to conclusion after eight minutes when the complete blue color appears.
A beaker contains 318 mL
m
L
of a 5.75 M
M
HCl(aq)
H
C
l
(
a
q
)
solution. Determine the new concentration of the solution after it is diluted by adding 143 mL
m
L
of water to the beaker.
Answer:
3.97 M
Explanation:
Given data:
Initial volume V₁ = 318 mL
Initial molarity M₁ = 5.75 M
New volume V₂= 461 mL
New concentration M₂= ?
Solution:
New volume V₂= 143 mL+ 318 mL
New volume V₂= 461 mL
Formula:
M₁V₁ = M₂V₂
M₂ = M₁V₁ / V₂
M₂ = 5.75 M × 318 mL / 461 mL
M₂ = 1828.5 M. mL/ 461 mL
M₂ = 3.97 M
2.
What did five different witnesses see in the area where Mary Lou Arruda
disappeared?
A. Mary Lou talking to an unknown man.
B. A green car driven by an unknown man.
C. Mary Lou's bicycle in the trunk of a green car.
D. An unknown man on foot following Mary Lou .
Answer:
c
Explanation:
I believe its c but i could be wrong sorry if I am
Four substances are tested for different properties. The results of the tests are in the table below.
Substance
Combustible
Reactivity
Solubility in water
Solubility in ether
Boiling point (ºC)
W
Yes
Yes
Soluble
Insoluble
883
X
Yes
No
Insoluble
Insoluble
2,750
Y
Yes
No
Insoluble
Soluble
196
Z
No
Yes
Soluble
Soluble
98
Which substance is most likely an alkane?
W
X
Y
Z
Answer:
Element Y, or the third option
Explanation:
Alkanes are insoluble in water, but soluble in ether. Their boiling points are pretty low, barely reaching 200 degrees, so element Y is an alkane.
Answer:
c.
Explanation:
What is the mass of oxygen in 230 g of sulfurous acid, H2SO3? (With solving pleaseee)
Answer:
Hi. U should do like this
HELP AN ILL PUT U IN BRAINLIEST - THANKYOU
Answer:
D
Explanation:
The amount increased to a certain point then decreased
Answer:
it is D
Explanation:
Find the mass (in grams) of 1.5 moles of BaSO4
Answer:
350 g BaSO₄
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
1.5 mol BaSO₄
Step 2: Identify Conversions
Molar Mass of Ba - 137.33 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of BaSO₄ - 137.33 + 32.07 + 4(16.00) = 233.4 g/mol
Step 3: Convert
[tex]1.5 \ mol \ BaSO_4(\frac{233.4 \ g \ BaSO_4}{1 \ mol \ BaSO_4} )[/tex] = 350.1 g BaSO₄
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
350.1 g BaSO₄ ≈ 350 g BaSO₄
Ice packs are used to make things cold or to add cold to an injury. Some people use insulated cups to keep things like coffee warm. How are these cups different from an ice pack? How might the molecules inside an ice pack be different from the liquid inside of an insulated cup?
wow isn't this interesting, I never would've thought to find u on here
Populations in the deep-sea vent ecosystem can get energy storage molecules without sunlight. Do you agree or disagree with this claim? Explain your answer.
Answer:
Agree
Explanation:
The deep-sea vent ecosystem gets energy storage molecules without sunlight. Life in the vent ecosystem relies on alternate energy through the use of hydrogen sulfide present in the water emanating from the vent.
The producers that form the basis of the food chain are bacteria that use the hydrogen sulfide to create energy-rich molecule in a process known as chemosynthesis.
The equation of the chemosynthesis is as below:
[tex]CO_2 + 4H_2S + O_2 --> CH_20 + 4S + 3H_2O[/tex]
Which of the following best defines an acidic solution?
Answer:
D is the correct answer
Explanation:
A is incorrect because anything above 7 on the PH scale is a base
B is incorrect because anything equal to 7 is neutral
C is incorrect because there is no substance less than 0 on the PH scale.
Hopefully this helps.
When is the potential energy transformed into kinetic energy?
When it is in motion, i.e no longer stopped
Explanation:
If a ball is lifted to a certain height, it gains potential energy. If it is then dropped, the potential energy is converted into kinetic energy as it looses height but gains speed.
CHEM ASSIGNMENT!!
PLEASE HELP
Answer:
Explanation:
q=mcat
q= 50g(4.184)(100-100)
q = 0
Cookware companies have been using a chemical called C-8, which helps to create a nonstick coating to pans. However, the Environmental Protection Agency (EPA) recently claimed that the use of C-8 in the manufacturing of nonstick cookware should be discontinued because studies show it causes cancer.
Who might benefit financially the most from the EPA’s claim?
OwO ^ ^ its A guys knowing cause i took the test
Answer:
C
Explanation:
cookware manufacturers who make pans out of steel only
Mitochondria are found within: A) All prokaryotic cells B) A cell's plasma membrane C) A cell's nucleus D) Eukaryotic cells E) None of these answers are correct
Answer:
The correct answer is - D) Eukaryotic cells.
Explanation:
The mitochondrion is found in all eukaryotic organisms with the exception of a few. It is a double-membrane-bound organelle within the cytoplasm of the cell that takes in nutrients, breaks them down, and creates energy that makes it the powerhouse of the cell.
It turns the chemical energy from nutrients in the cell to generate energy in a form usable to the host cell which is ATP. Prokaryotic cells lack mitochondria and other double membrane-bound organelles and it s found outside of the nucleus in the eukaryotic cells.
Chemical and physical element properties are determined by their valence electrons. How do you describe metals with only one valence
electron?
A .highly reactive
B. poor conductors of electricity
C. reactive with other metals
D. likely to gain more electrons
Answer:
B
Explanation:
Chemical and physical element properties are determined by their valence electrons metals with only one valence electron are poor conductors of electricity. Option B is correct.
What are valance electrons?Valence electrons are the electrons present at the valance shell or orbit of the atom and always take part in the chemical reaction or reaction with other metals and can conduct electricity.
If the atom contains only one valance electron in the outermost shell or valance shell then it cannot conduct the electricity properly due to the fewer number of electrons.
Therefore, Option B is correct. Chemical and physical element properties are determined by their valence electrons metals with only one valence electron are poor conductors of electricity.
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if u want to sign a form and u meet your subject teacher to sign his subject and he tells you to write an undertaking what will you write . You will have to write your address and his address, you have to write heading, body of the letter and salutation.
you would have to kn
what does light emission(color) tell us about elements?
Answer:
The color of the light emitted depends on the energies of the photons emitted, which are in turn are determined by the energies required to move electrons from one orbital to another. Those colors are as distinctive to each element as fingerprints are to people. Hope this helps
Answer:
The color of the light emitted depends on the energies of the photons emitted, which are in turn are determined by the energies required to move electrons from one orbital to another. Depending on the element you put in the flame, various different energies of photons (colors) will appear. Those colors are as distinctive to each element as fingerprints are to people.
Explanation:
Which alignment of the Sun, Moon, and Earth causes a lunar eclipse?
A.
B.
C.
D.
Answer:
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly with the Earth in the middle. Hence, a lunar eclipse can only occur the full moon phase
Explanation:
please mark me brainlist
Answer:
A sun
Explanation:
because sun has heat and gives light
Which of these could create static electricity?
A.Plugging in a vacuum
B.Running a blender
C.Combing one's hair
D.Turning on a car
c well actually I remember being tought this but I cant remember it 100
Find the kinetic energy of a 5kg bowling ball that is traveling 2 meters per second
Explanation:
KE = ½ mv²
= ½ x 5 x 2² joule
= 10 joule
what is the electical charge on the nucleus of the boron atom ?
Which option is an example of a chemical property?
boiling point
density
color
ability to react with oxygen
Answer:
Boiling point is one of the answers
Anita was using steel to make rusted sculptures. After building each sculpture, she caused the steel in the sculpture to rust by placing it into a tub filled
with salt water for eight hours. Anita wondered if steel would rust faster submerged in vinegar instead of salt water. To find out, Anita cut ten squares of
steel sheet metal and split them into two equal groups. She put one group of squares into a tub filled with salt water and the other group of squares
into a tub filled with vinegar. Once an hour for eight hours, Anita counted the number of rusted steel squares in each group.
What is the manipulated independent variable in Anita's experiment?
Answer:
The type of liquid in the tub (salt water or vinegar)
Explanation:
The manipulated independent variable in Anita's experiment is the type of liquid in the tub.
The independent variable is the controlled or manipulated variable in the course of an experiment. It can also be referred to as the 'cause' variable which has the capacity to produce 'effects' on another variable - the dependent variable.
In this case, the type of liquid the tub is filled (salt water or vinegar) will hypothetically affect the rusting period of the steel. Hence, the dependent variable is the type of liquid the tub is filled while the dependent variable would be the time it takes for the steel to get rusted.
A mixture contains 20% iron ions by mass. What mass of iron chloride (FeCl) would
you need to provide the iron ions in 50 g of the mixture? A of Fe = 56, A of Cl = 35.5.
.
Mass of iron chloride (FeCl₂) : 22.68 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
[tex]\tt mass~Fe=\dfrac{Ar~Fe}{MW~FeCl_2}\times mass~FeCl_2[/tex]
The iron ions in 50 g mixture :
[tex]\tt 20\%\times 50~g=10~g[/tex]
[tex]\tt 10=\dfrac{56}{127}\times mass~FeCl_2\\\\mass~FeCl_2=22.68~g[/tex]
Please help me
What will oxygen likely do to complete its outermost shell, based on the Lewis dot diagram shown?
accept electrons
accept some electrons and give up other electrons
move electrons from the inner shell to the outer shell
give up electrons
Answer:
A. Accept electrons
Explanation:
The octet rule states that 8 electrons stabilizes a molecule. This means that oxygen will try to fill the two empty spots with electrons from other molecules. The Lewis Dot diagram shows these two empty spots with the empty circles at the bottom.
Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule. Here 'O' accepts electrons. The correct option is A.
The electrical structures of the elements, especially the electron pairings, are reflected in the Lewis dot structures. Lewis structures can be viewed as "electron bookkeeping" and are a helpful approach to condensing some bonding-related information. Each dot in a Lewis dot structure corresponds to 1 electron.
Group 6 member oxygen still requires two additional electrons to complete its outer shell and remain stable. According to the octet rule, an object needs 8 valence electrons in the outer shell to be stable.
Thus the correct option is A.
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Explore the Build an Atom simulation. Identify one interesting function, quality, or graphic in the simulation.
Answer:
- Adding protons changes the identity of the atom, adding one moves from the right to left on the Periodic Table.
Help please. ASAP.
1. Explain how you think changing in the thickness or length of the nail will affect the strength of the electromagnet
Answer:
I believe- If there is more metal for the magnet to reach for, then the strength will grow but it may be harder to pick up off of a surface depending on the weight of the nail. If it is a light nail, it would be more efficient for a quick result in having the magnet to pick it up
Explanation:
Answer:
Ferromagnetic materials make the magnet stronger than non-ferromagnetic materials like paper, wood, or air. A wider nail will make the magnet stronger. Making the nail longer will not make the magnet stronger, unless you also add more turns to the coil.
Explanation:
I hope this helps!!
how many atoms are in hydrogen
Answer:6.02
Explanation:
Answer:
there are about 6 atoms in hydrogen
7.
A 27.8 L balloon is filled with 7.52g of gas X and placed next to a 27.8 L balloon filled with helium.
Given that Helium has a density of 0.179g/L, which statement correctly explains the movement of the balloons
with valid justification?
a) The balloon filled with helium will float higher because helium is less dense than gas X
b) The balloon filled with gas X will float higher because gas X is less dense than helium
c) Both balloons will float to the same level because their densities are the same
d) Both balloons will float to the same level because their volumes are the same
e) There is not enough information to determine the movement of the balloons
Answer:
a) The balloon filled with helium will float higher because helium is less dense than gas X
Explanation:
Since gases are known to not have fixed density, they take up the density of their containers, let us find the density of the gas in first balloon.
Density is the mass per unit volume;
Density = [tex]\frac{mass}{volume}[/tex]
Insert the parameters and solve;
mass of gas = 7.52g
volume of the gas = 27.8L
Density = [tex]\frac{7.52}{27.8}[/tex] = 0.271g/L
Let us compare the two densities;
Density of gas = 0.271g/L
Density of helium = 0.179g/L
We see that the density of the gas is higher than that of helium, so, it not float as high as the balloon with helium. The balloon with helium is lighter.
Maggie has 4 binders with 30 stamps in each binder. She has 3 binders with 36 baseball cards in each binder. If she gives away 45 stamps to a friend, how many stamps and cards does she have left? Maggie has stamps and cards left.
Answer:
The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183
Explanation:
If Maggie gives 45 stamps to a friend, you must calculate the number of stamps and cards she has left.
You know Maggie has 4 folders with 30 stamps in each folder. So the number of stamps she owns is calculated as:
4 folders*30 stamps in each folder= 120 stamps
If Maggie gives 45 stamps to a friend, then the number of stamps she has left will be calculated as the difference (the subtraction) between the stamps she owned and the ones she gives away:
120 stamps - 45 stamps= 75 stamps
On the other hand, she has 3 binders with 36 baseball cards in each binder. So the number of cards she owns is calculated as:
3 binders * 36 baseball cards in each binders= 108 baseball cards
The number of stamps and cards you have left is calculated as:
75 stamps + 108 baseball cards= 183
The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183