Answer:Option D
Explanation:i took the test
Please answer correctly..
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A chemical reaction takes place to allow instant cold packs to absorb energy. This is an example of a(n) __________.
A. physical change
B. exothermic reaction
C. endothermic reaction
D. precipitate
Answer:
c. Endothermic
Explanation:
endothermic reactions absorb heat, exothermic reactions release heat.
Compared to gases liquids can be easily compressed. True or false?
Answer:
true
Explanation:
Answer: false, gases can be more easily compressed than liquids.
Explanation: They're easier to compress because there's much more empty space between the gas particles.
When liquid water boils the distance between the particles increases
Answer:
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid.
The distance between the particles increases tremendously the attraction doesn't change.
What occurs to the water particles whilst water boils?
Whilst water is boiled, the heat energy is transferred to the molecules of water, which begin to pass extra quickly. ultimately, the molecules have an excessive amount of power to stay connected as a liquid. while this takes place, they shape gaseous molecules of water vapor, which go with the flow to the floor as bubbles and tour into the air.
Does the space among particles increase when heated?On heating, their kinetic electricity pushes neighboring atoms or molecules other than each different. This pushing of atoms or molecules outcomes in a slightly accelerated distance among molecules and the volume of stable additionally increases.
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when one gram of gasoline burns in a cars engine, the amount of energy given off is approximately 1.03x10^4 cal. express this quantity in joules. use 1 cal= 4.184 j
The amount of energy in joules : 4.31 x 10⁴ J
Further explanationEnergy can be interpreted as the ability to do work
There are several examples of energy , including heat energy
The amount of heat is influenced by the mass of the object and the difference in temperature
Can be formulated
Q = m.c.ΔT
Q: heat received or removed by an object (J)
m: object mass (kg)
c: heat type substance (J / kg⁰C)
ΔT: temperature change (⁰C)
The amount of energy given off is 1.03x10⁴ cal.
Because 1 cal= 4.184 J, then
[tex]\tt =1.03\times 10^4\times 4.184\\\\=\boxed{\bold{4.31\times 10^4~J}}[/tex]
What should you wear during lab investigations to protect your eyes?
Answer:
goggles
Explanation:
The people on this website are the only reason I'm passing!
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A sample of oxygen gas at STP is depicted in the diagram in the picture (4) of the image attached.
What is an oxygen molecule?An oxygen molecule is a diatomic molecule, which is a molecule made up of just two atoms of the same element. The oxygen molecule in this instance is made up of two oxygen atoms.
If you have a lot of oxygen atoms at STP, they will spontaneously combine to produce O₂ because double bonds between oxygen atoms make their structure more stable.
If we carefully examine the figure in the attached image, we will see that it depicts a molecule made up of two atoms of the same element, which perfectly matches the definition of the oxygen molecule.
Therefore, this is shown in diagram (4), spontaneously combine to produce O₂ because double bonds between oxygen atoms make their structure more stable.
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a man is 72 inches tall, what is his height in meters? round to three significant figures.
Answer:
1.829 meters is the answer
Explanation:
What changes in trade did Europeans hope to bring about by finding sea routes to Asian markets?
PLEASE ANSWER THIS WUICK PLEASEEEE
Answer:
controlled by the Arabs, who brought frankincense and myrrh by camel caravan from South Arabia.
A student accidentally left a bottle of ammonia unclosed in the corner of a laboratory
After a few minutes the entire laboratory smelled of ammonia.
Which process has occurred?
A
Brownian motion
B
Diffusion
с
Evaporation
D
Distillation
Answer:
Evaporation
Explanation:
because the ammonia is left unclosed
The smell of ammonia has been spread from a corner to entire room by the process of diffusion. Thus, option B is correct.
Ammonia has been the liquid compound with the formula [tex]\rm NH_4[/tex]. It has a pungent smell. Ammonia has been used in several synthesis reactions, and in various industrial processes.
The diffusion has been the process of transfer of molecules from higher concentration to lower concentration. The smell of ammonia has been spread in the entire laboratory from a corner.
The ammonia molecules in the bottle are at higher concentration while there has been lower concentration of ammonia in the environment. With the process of diffusion there has been the transfer of ammonia molecules in the environment.
Thus, diffusion has been responsible for spreading the smell of ammonia in the laboratory from a corner. Thus, option B is correct.
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Make a funny sentence of alloys for Magnesium
Here is an example for Mercury, it HAS to for Magnesium
“I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answer:
Sometimes the whole alloy in a uniform is a solid solution
In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together). Based on ion sizes, arrange these compounds by their expected lattice energy. Note that many sources define lattice energies as negative values. Please arrange by magnitude and ignore the sign. ∣∣lattice energy∣∣=absolute value of the lattice energy Na2S, K2S Cs2S Li2S
Answer:
Li2S> Na2S> K2S> CsS
Explanation:
The lattice energy of ionic species depends on the relative sizes of ions in the ionic compounds. As the size of ions increases, the lattice energy decreases and vice versa.
When the size of the anions are the same, the lattice energy now depends on the relative sizes of the cations. Therefore, since all the compounds are sulphides and the order of magnitude of ionic sizes is: Li^+ < Na^+ < K^+ < Cs^+.
Therefore, the order of decrease in lattice energy is; Li2S> Na2S> K2S> CsS
This is a very long thing, Answer any of the questions that you can please anything helps just make sure you put the numbers for the questions you answer:
Question 1: Laws of Conservation of Matter and Energy (2 points)
a. Law of conservation of matter (1 point)
i. What does the law say about matter?
ii. What about matter can change and what does not change, according to the law?
b. Law of conservation of energy (1 point)
i. What does the law say about energy?
ii. What about energy can change and what does not change, according to the law?
Question 2: Phases of Matter (2 points)
a. What are the four states, or phases, of matter? Describe the shape and volume properties of each phase. Can they change, or are they fixed? (1 point)
i. _______________________
Shape:
Volume:
ii. _______________________
Shape:
Volume:
iii. _______________________
Shape:
Volume:
iv. _______________________
Shape:
Volume:
b. When heat energy is absorbed by matter, the matter's temperature increases. When heat energy is released by matter, the matter's temperature decreases. The matter can also change from one phase to another when heat energy is absorbed or released. Identify whether matter absorbs heat or releases heat as each of the following phase changes occur. (1 point)
i. From solid to liquid (melting)
ii. From liquid to solid (freezing or hardening)
iii. From liquid to gas (evaporation)
iv. From gas to liquid (condensation)
Question 3: Types of Energy (4 points)
a. List four kinds of energy. Give a brief definition of each. (1 point)
i. ______________________________________________________________
ii. ______________________________________________________________
iii. ______________________________________________________________
iv. ______________________________________________________________
b. Energy can change from one form to another. Describe the energy conversions in the following scenes. (1 point)
i. A kid falling out of a tree
ii. A scout rubbing sticks together to start a fire
iii. A man running a kerosene heater
c. What is the equation for calculating gravitational potential energy on the Earth? (1 point)
d. What is the equation for calculating kinetic energy (1 point)
Matter cannot be created or destroyed.
Further explanationConservation of mass applies to a closed system, where the masses before and after the reaction are the same
Or
Conservation of mass means:
In a closed/isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.
So what changes is the form, into a liquid, gas or solid
while what does not change is the mass
How many moles of zinc are in 12.044 X 10^26 zinc atoms
Explanation:
Explanation:
The problem basically wants you to find a way to convert between the number of atoms present in the sample and the number of moles they are equivalent to.
To convert between atoms and moles we use something called Avogadro's constant, which basically acts as the definition of a mole.
More specifically, in order to have one mole of an element you need 6.022⋅1023 atoms of that element. You can thus use this number as a conversion factor to take you from atoms to moles or vice versa.
In your case, you will have
6) What types of atomic orbitals are in the third principal energy
level?
C A sand p only
B. p and d only
CC. s, p, and d only
CD. s.p. d, and f
Answer:
Types of atomic orbitals present in the third principal energy are s, p and d only .
Explanation:
OPTION A-: s and p atomic orbitals - these two orbitals are present in second principal energy level. Therefore , the option is incorrect. OPTION B-: p and d only - This option is wrong as there is no such principal level energy where , s atomic orbital is absent .OPTION C-: s , p and d only -these orbitals are present in third principal energy level. The third major level of energy has one orbital, three orbitals of p, and five orbitals of d, each of which can contain up to 10 electrons. The third stage thus holds a maximum of 18 electrons. This option is correct .OPTION D-: s , p, d and f only -There is also a f sublevel at the fourth and higher stages, containing seven f orbitals, which can accommodate up to 14 electrons at most. Therefore, up to 32 electrons will hold the fourth level: 2 in the s orbital, 6 in the three p orbitals, 10 in the five d orbitals, and 14 in the seven f orbitals. This option is incorrect .Thus , the correct option is C (s , p and d only .)
Answer:
s, p, and d
Explanation:
In my closet, I have 5 black shirts, 6 brown shirts, 3 light blue shirts, 5 white shirts, 2 green
shirts, 4 navy blue shirts. What is the total number of shirts?
Explanation:
i think if you add them all the total is 26
Answer:
25 shirts
Explanation:
5+6=11+3=14+5=19+2=21+4=25 (if u dont understand how I wrote that then) 5+6=11, 3+5=8, 2+4=6
11+8=19, 19+6=25
How is heat transferred when a person steps on hot sand?
O A. From the sand to the feet
O B. In both directions between the sand and the feet
C. From the feet to the sand
O D. Heat is not transferred.
Answer:
Explanation:
Heat moves from hot sand to the bottoms of your feet by conduction. Conduction is the transfer of heat between objects that touch each other.
Heat moves from hot sand to the bottoms of your feet by conduction.Hence Option (A) is correct.
What is Conduction ?Heat conduction is a phenomenon that occurs through the interaction of neighbouring atoms and molecules, transferring their energy/heat (partially) to their neighbours.
This is the most significant means of heat transfer within a solid and between solid objects in thermal contact.
Conduction is the transfer of heat between objects that touch each other.
Therefore, Heat moves from hot sand to the bottoms of your feet by conduction.Hence Option (A) is correct.
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1. John travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Why?
Answer:
In Australia, it's warmer than most of the United States during winter.
Explanation:
Could someone please tell show me steps to solve this, I am so confused.
9.80 grams of magnesium metal react with excess hydrochloric acid, and 29.8 grams of magnesium chloride are produced
by the reaction. What is the percent yield of this reaction?
Mg + HCI –> MgCl2 + H2
And this is y I should of paid attention in that one science class in middle school that taught this...
(￣▽￣;)
Sodium easily combines with chorine is reactivity
answer
yes
Explanation:
The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate,
Answer:the atoms of a solid aluminium can are close together vibrating in a rigid structure if the can is warmed up on a hot plate
Explanation:
3. Two or more substances that are not
chemically combined...
Element
Mixture
Compound
Answer:
Its a mixture.
Which describes any compound that has at least one element from group 17?
how many atoms are in SH2O4 ?
Answer:
≈0.56 moles or ≈3.37⋅ 10 23 atoms
Explanation:
What directions do periods go on a periodic table
Answer:
left to right
The periods go on a periodic table, left to right. The periodic table is the systematic arrangement of elements in row and column.
What is a periodic table ?The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements. It is often used in physics, chemistry, and other disciplines, and is frequently regarded as a symbol of chemistry.
Because of the orderly arrangement of the elements, it is known as the periodic table. Periods refers to the horizontal rows, and Groups to the vertical columns.
The most significant role of hydrogen in the human body is to maintain your level of hydration, making it the most significant element on the periodic table.
All known elements are grouped together in the periodic table of elements into groups with related characteristics. It becomes a crucial tool for chemists, nanotechnologies, and other scientists as a result. You can forecast how chemicals will behave if you learn to utilize and comprehend the periodic table.
Thus, The periods go on a periodic table, left to right.
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how many significant figures in 368.1371 ?
How many protons, neutrons, and electrons does the atom above have?
-12 protons, 7 neutrons, 1 electron
-7 protons, 12 neutrons, 1 electron
-12 protons, 5 neutrons, 7 electrons
-7 protons, 5 neutrons, 8 electrons
-7 protons, 5 neutrons, 1 electron
-7 protons, 12 neutrons, 8 electrons
-5 protons, 7 neutrons, 8 electrons
Answer:
Nitrogen has 7 protons, 7 neutrons, and 7 electrons.
So, I'm not entirely sure about the choices you provided :)
period 6, group 12 (2B)
Answer:
mercury or Hg
Explanation:
i looked at the periodic table haha
hope this helps and is right <3
How many electrons do carbon and oxygen share?
I-0-I
:0:
Intro
Done
oxygen has 6 valence electrons and 2 electrons and carbon has 4 electron
Answer:
4!!!!!!!!!!
Explanation:
i got it right
What is the BEST scientific definition of the term “force”?
Answer:
Any unapposed interaction that will change the motion of an object.
Explanation:
My physics teacher had us write this down last week.