the answer is D because can be tested the others ones is opinion
please mark me as brainliest
Some Reactions are endothermic
How does the temperature and energy change in an endo thermic reaction?
temperature change
energy change
А
decreases
energy taken in
B
decreases
energy given out
С
increases
energy taken in
increases
energy given out
D
increases
energy given out
Answer:
endothermic means energy is taken in and temperature increases.
Which statement best describes balancing equations and the law of conservation of mass?
O There are more atoms in the reactants than in the products, and the total mass is the same in the
reactants and in
the products
O The number of atoms is the same in the reactants and in the products, and the total mass is the same in the
reactants and in the products
O There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the
products
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in
Toms
the products
Answer:
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
The statement best describes balancing equations and the law of conservation of mass is the number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products. Therefore, option B is correct.
What is the law of conservation of mass ?According to the law of conservation of mass or principle of mass conservation, any system that is closed to all transfers of matter and energy must maintain a constant mass over time since the system's mass cannot vary and neither more nor less amount can be added or subtracted.
This law states that no matter what physical or chemical change occurs, the overall mass of the products and reactants remain identical.
Understanding and producing different chemical reactions depend heavily on this law. Researchers might anticipate how much the result would be if they knew the identities and quantities of the reactants for each reaction.
Thus, option B is correct.
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Solid sodium is reacted with chlorine gas and a crystalline solid was formed. The crystalline solid is evidence that
A. The sodium was broken down into tiny pieces by the chlorine.
B. The reaction caused impurities to fall out.
C. Elements bond in a multitude of ways to make compounds.
D. The chlorine solidified.
Answer:
C. Elements bond in a multitude of ways to make compounds.
what is the value of youth participating in volunteering
Answer:
Volunteering helps the teens gain new skills necessary for the job market such as leadership, communication skills, dependability, time management, and decision making.
Explanation:
The Hidden Values of Volunteering
Learn New Skills. One fantastic thing that volunteering can offer you is a new understanding of your own abilities. ...
Test for Your Future. An added side effect of volunteering is that it gives you an opportunity to try out possible careers, majors, and opportunities. ...
Meet New People. ...
Accomplish Something Important.
HOPE THIS HELPED ❤✨
KEEP GETTING THIS WRONG PLZ HELP
Answer:
1 224.24242 kg/ m to the 3rd power
If the reaction yield is 88.2%,what mass in grams of hydrogen is produced by the reaction of 7.73 g of magnesium with 1.31 g of water
Mg + 2h2o >>mg(oh)2+h2
Answer:
Mass of hydrogen produced is 0.07g.
Explanation:
Given data:
Mass of magnesium = 7.73 g
Mass of water = 1.31 g
Reaction yield = 88.2%
Mass of hydrogen produced = ?
Solution:
Chemical equation:
Mg + 2H₂O → Mg(OH)₂ + H₂
Number of moles of water:
Number of moles = mass/ molar mass
Number of moles = 1.31 g / 18 g/mol
Number of moles = 0.07 mol
Number of moles of magnesium:
Number of moles = mass/ molar mass
Number of moles = 7.73 g / 18 g/mol
Number of moles = 0.43 mol
Now we will compare the moles of water and magnesium with hydrogen.
Mg : H₂
1 : 1
0.43 : 0.43
H₂O : H₂
2 : 1
0.07 : 1/2×0.07 = 0.035
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 0.035 mol × 2 g/mol
Mass = 0.07 g
Answer: 0.064 grams is the answer
Explanation:
at the end you must multiply 88.2/100*0.073=0.064
Given that one mole occupies 22.4 L at STP, show that R = .082 (atm * L)/(mol*K)
Please answer 3 and 2
Answer:
3 is c but im unable to see the 2nd questions picture
Explanation:
please help
Air masses that form over large bodies of water are moist. What process determines the amount of moisture in an air mass?
Answer:
I don't know if this is right but try it. The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. This amount of space in air that can hold water changes depending on the temperature and pressure.
The purpose for witch something is designed or exists
Answer:
to help
Explanation:
to help
9) Which must be a mixture of substances?
A) solid
B) liquid
C) gas
D) solution
Answer:
D
Explanation:
what always forms between two large air masses of different moisture and air temperature?
Answer:
"What always forms between two large air masses of different moisture and air temperature?"
Explanation:
When a cold air mass replaces a warm air mass the boundary between the two air masses is called a cold front. ... Fronts form at the boundary between air masses of different temperatures and moisture. Warm air always slopes upward over colder air.
The boundary between two air masses of different density such when it can not move called “stationary” “warm” when warmer air replaces cooler air.
What is density ?The density can be defined as the mass per unit volume which means that it is the ratio between mass and volume, that means the object has the stuff in a unit volume.
Density is determined by the matter where it shows how the matter is tightly crammed together and it was put forwarded by the Greek scientist Archimedes
To calculate the density of an object, the mass (m) can be divided by the volume (v)
Density = Mass/Volume
The different units include SI unit of density which is kilogram per cubic meter (kg/m3) or in cgs unit of grams per cubic centimeter (g/cm3).
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When two or more different elements unite chemically, they form a
A) compound
B) mixture
C) metalloid
D) solution
Answer:
compound ahhhhhhhhhhhhhgh
Which is the larger atom S or K
Answer:
I'm pretty sure k
Explanation:
I'm not for sure I'm trying to help
Answer:
Potassium
Explanation:
Atomic size decreases across a Period, from left to right as we face the Table, and INCREASES down a Group, a column of the Periodic Table.
Im confused please help :(
1.) When kinetic energy is high, velocity is high.
true or false
2.) When potential energy is high, velocity is at its highest.
true or false
Answer: #1: true
#2: false
Explanation: I’m not 100% sure though!
Instructions
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1. This experiment was to find how mass and speed effect KE. This is important because if you were in a situation where you needed something to go higher, you would know to add more or less of mass/speed.
To test mass, we filled the bean bag with a certain amount of water, then dropped it. After, you recorded how high it made the bean bag go. The same with speed, but same amount in the bottle, just dropped from different heights.
My hypothesis is when you have more mass, the KE will be greater. This is also the same with speed, if it is dropped from a higher place, the bean bag will launch farther than the last time.
2. Data I collected from the lab was like my hypothesis explained. When the height of the bottle increased, it made the bean bag go higher than the last. And I tested 4 different masses, 0.125 kg, 0.250kg, 0.375kg and 0.500kg. Each time the bean bag went higher on a larger mass.
A lot of times on the speed test, the bean bag would go higher than the bottle drop point, but not every time. Also, when it was dropped from the same height each time, some results varied quite a bit, like when it was dropped from 1.28 the results were 1.14 then 1.30 1.30. Mass on the other hand was all in the same number range, only once the numbers were a bit off from each other.
3. Some formulas I used were KE= ½ mv^2 and Ht v^2/2g. The first was to calculate the kinetic energy of an object, m=mass v=speed. Second was for finding out what height I needed to drop something to reach a certain speed, Ht=Height and g= Gravitational Acceleration of 9.8 m/s^2.
I used these to figure out tables that showed relationships between different things like mass and KE or speed and height. The whole time I was doing the lab, my data was going up, when there was more mass/speed there were higher values in the table.
This means that my hypothesis at the beginning was correct, more of m/s means KE will increase proportionally because they are all linear. I found it surprising when the bean bag height went over the water bottle drop mark.
4. To conclude, my hypothesis matched my data. The data values went up when more mass or speed was added. This means if I were in a situation where I needed more kinetic energy for something, I would know to increase mass or the speed of the object giving it energy.
The reason that this hypothesis is correct is when you have more mass, you have more energy. So, when you drop let's say a baseball, it isn’t that heavy so it would only launch the bean bag so far. But a bowling ball is very heavy and has lots of energy when falling because of that, it would make the bean bag go very high.
To make this experiment better, I would use a smoother material for the lever so energy wouldn’t be lost by friction from wood rubbing together. Also, maybe a scanner or video camera to more accurately record how far the bean bag went. All of these would help the lab get more precise results, maybe they could be used in a future lab.
Explanation:
Answer:
ima give my whole doc if anyone need it in future like i did Edge 2023
Explanation:
What is the first step when using a microscope?
A. Place the microscope slide on the stage
B. Plug the microscope in and turn it on
C. Switch to the low power objective lens
D. Secure the slide to the stage clips
Answer:
I think the answer is B :)
Answer:
the first step is B
Explanation: I'm on this lesson
18. Which two particle diagrams each represent a sample of one substance? Key O = atom of oxygen = atom of hydrogen 0 = atom of chlorine 8 OO 1 நம் மும் 20 2000 (1) I and III (3) II and IV (2) II and III (4) I and II
Answer:
1 and 11
Explanation:
Answer:1 and 11
Explanation:
will mark brainliest, please hurry! :>
When a hydroxyl group is substituted for a hydrogen atom in a hydrocarbon, what type of molecule results?
a.
an alcohol
c.
a carboxylic acid
b.
an amine
d.
a polymer
Answer:
ans. will be a. an alcohol
C2H6O
Percent Composition with work shown
Answer:
50 percent
Explanation:
percentage
Which pair of elements are most likely to form a molecular compound?
Nitrogen and Hydrogen
Calcium and Copper
Chlorine and Neon
Please help! I will mark brainliest if correct!
Answer: Two nonmetals.
Explanation:
Answer:The only pair of nonmetals is sulfur and fluorine.
Explanation:The pair of elements most likely to form a molecular compound with each other are two nonmetals.
Which of the following representations shows the correct placement of trophic levels?
Secondary Consumers
Primary Consumers
Producers
What is the difference in drawing Lewis Dot
Structures for ionic and covalent bonds?
The Lewis Dot Structure for ionic compounds must demonstrate how the electrons are transported to create the ions in the compound. The Lewis Dot Structures of covalent compounds must demonstrate how the electrons are being shared to finish the octets of each atom in the molecule.
What is an ionic compound ?A chemical compound known as an ionic compound is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the molecule is generally neutral.
The term "ionic bonding" refers to a bond in which the ionic character is greater than the covalent character, i.e., when there is a significant difference in the electronegativity of the two atoms, which makes the bond more polar (ionic) than in a covalent bond, where the electrons are distributed more evenly.
The Lewis structures are not frequently drawn for ionic compounds due to the electrical motion of electrons.
Thus, The Lewis Dot Structure for ionic compounds must demonstrate how the electrons are transported to create the ions in the compound.
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How does the nucleus control cellular activity?
What is the toto number of neutrons in an atom of 73 li
7. The image shows the effects of exposing the plants to different color of
lights. The size of the plant was measured and the number of leaves were
counted if they are alive or dead. Size of plants and number of leaves are
Size of Plant
Number of Leaves
Living or Dead?
science or
What’s the answer?
Answer:
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Explanation:
What is the process that occurs when repeated freezing and thawing breaks apart rocks?
Erosion
Deposition
Physical weathering
Chemical weathering
Answer:
C. Physical weathering.
Answer: C. Physical weathering.
Explanation:
Is it true or false that the Temperature is a direct measurement of the energy stored in a substance?
Which statement best describes how to predict the formula of a stable ionic compound? Use the same number of cations as anions so that the compound is neutral. Use more cations than anions so that the compound is positively charged. Use enough cations and anions so that the total charge is zero. Use fewer cations than anions so that the compound is negatively charged.
IT's C
Answer:
Option C: Use enough cations and anions so that the total charge is zero
Explanation:
In a stable ionic compound, to get a predict the formula, the positive and negative ions on one side need to cancel out so that the compound becomes neutral.
For example, let's take consider an ionic compound known as Potassium Chloride. It has a formula KCl. Now , breaking it down, the charges will be; K+ and Cl-. This means Potassium (K) has +1 charges and Chloride has -1 charges. Thus, they will cancel out to give a total neutral charge of 0.
Thus, the correct answer is to use enough a ions and cations so that the total charge is zero.
Answer:
C
Explanation:
edge 2020 unit rev
What gets heavier in an electrochemical cell?
O A. The cathode
B. Negative ions
O C. The salt bridge
O D. The anode
Answer:
A. the cathode
Explanation:
Answer:
A. The cathode
Explanation:
a p e x