Answer:
Explanation:
Exothermic: the surrounds feel warmer. A wood fire stove is a good example of an exothermic reaction. You can feel the heat on your hands. It's exothermic.
Endothermic is exactly the opposite. The reaction takes place, but the heat comes from the surroundings. When you touch something that goes through an endothermic reaction, it feels much cooler.
This reaction, just by definition is endothermic.
What is a Chemical Properties and Physical Properties? Please tell me the deffinition of them both.
Answer:
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.
Explanation:
Which elements are the most reactive and why?
Answer:
Fluorine is identified as the most reactive nonmetal and the most electro-negative element in the periodic table, making it the strongest oxidizing agent. Caesium is the most reactive metal in the periodic table, so much that working with this metal often ends in explosions!
Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.
Hope that helps.
Almost 99% of the Earth's atmosphere is made up of two gases. What ere the two gases and the percents of each?
Answer:
21% oxygen and 78%nitrogen
Explanation:
Answer:
Nitrogen and Oxygen
Explanation:
nitrogen - 78 %
oxygen - 21%
11. The ease with which water can pass
through a rock or sediment is called
a. permeability c. porosity.
b. carbonation. d. velocity
Answer:
It's option a) Permeability.
How can you tell the difference between two clear liquids
Answer:
To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.
Explanation:
Make a super hero with the property of Science neutrons
Answer:
The poster should include:
TITLE: Creative name of superhero.
DESCRIPTION OF ELEMENT SUPERHERO (2 PARAGRAPHS):
This section should include a brief description of how your superhero acquired, used, or lived
with their element power. You may want to describe where does your superhero element lives
(where in nature can it be found). What are his/her superpowers? Does your superhero
element have a hideout? What are his/her strengths? What is his/her weakness? Who is
his/her arch nemesis (evil super villain)? What kind of super suit does your superhero have?
5 FACTS:
This section should include at least 5 fun facts about your element. You can choose to
describe facts that illustrate where your element is found in nature. You may also wish to
describe what is your element used for. You may address what are characteristics of your
element or what are important uses of your element. For example, can your element be made
into something useful or can your element combine with other elements to make something
totally different.)
ATOMIC DRAWING
Include the atomic structure of your element with correct labeling of its protons neutrons,
electrons. Make sure your drawing has the correct number of protons, neutrons, electrons.
DRAWING OF YOUR ELEMENT SUPERHERO
This section should include a drawing (in color) of your Element Superhero on a clean sheet of
WHITE paper. You may want to draw your Element Superhero fighting his nemesis (super
villain). Or you may want to draw your Element Superhero using his special powers.Explanation:
What percentage of the Periodic Table of Elements is Metals?
80 percent
About 80 percent of the elements are metals (shiny elements that conduct heat and electricity well), and 15 percent of the elements are nonmetals (poor conductors of heat and electricity). The remaining elements are metalloids, which share properties of both metals and nonmetals.
Answer:
80% of the Periodic Table consists of metals and 15% non-metals and 5% other elements.
Explanation:
how many moles of oxygen would you need to produce 4 moles of aluminum oxide? 4 Al + 3 O2 ----> 2 Al2O3
Answer:
6 moles
Explanation:
3 moles of O2 produce 2 moles of Al2O3 so in order to produce 4 moles pf AL2O3 you need 4 x 3 /2 moles of O.
which reaction is an oxidation-reduction reaction?
Answer:
pl
saponification palmitate
Exhaling CO2 (Carbon Dioxide) is an example of what?
A-Excretion
B-movement
C- Nutrition
D- Reproduction
Q2. Fill in the blank with correct words.
A: Chemical B: Horizontal C: Shells D: Columns E: Group VII
1) The vertical ___________are called groups and the_____________rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer_______________ for example, all the elements in ___________ have 7
electrons on their outer shells.
3) Elements in the same group have similar ___________ and physical properties
Answer:
Explanation:
1) The vertical Columns are called groups and the Horizontal rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer Shells for example, all the elements in Group VII have 7
electrons on their outer shells.
3) Elements in the same group have similar Chemical and physical properties
Explanation:
1) Columns
Horizontal
2)Shell
Group VII
3)Chemical
Nitrogen and oxygen can be separated from liquid air.State the name of this process.
Explanation:
Because of the earth and climate change the point of incidence mean that you mean by engineers to social evils activities.
Complete the given equation and mention whether heat is absorbed or evolved during the chemical reaction.
NaOH + HCl ……………. + …………….
need help !! :)
no unwanted ans ...
Answer:
NaCI + H2O
this is answer
A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?
A. The sodium ion is positive, and the hydroxide ion is negative.
B. The sodium ion is neutral, and the hydroxide ion is neutral
C. The sodium ion is positive, and the hydroxide ion is positive.
D. The sodium ion is negative, and the hydroxide ion is positive.
Answer:
A. Na+ OH-
Explanation:
positive and negative ions form bonds because positive and negative attract
Write a balanced equation and name the products of the reaction CaCl2+Na3(PO4)
Answer:
3CaCl2 + 2Na3(PO4) → Ca3(PO4)2 + 6NaCl
Explanation:
DOUBLE REPLACEMENT REACTION
CaCl2 + Na3(PO4) → Ca3(PO4)2 + NaCl
3CaCl2 + 2Na3(PO4) → Ca3(PO4)2 + 6NaCl
calcium chloride + sodium phosphate → calcium phosphate + sodium chloride
Hope that helps
a ___ wave is a disturbance in matter that transfers energy through the matter.
Answer:
Mechanical Waves
what is the mechanical hound in the book fahrenheit 451
Explanation:
The Mechanical Hound is a robotic animal that firemen can deploy to hunt and catch fugitives. It can be trained and programmed to hunt its prey very quickly by smell. Once it catches its prey, the Hound injects the person with a sedative; unable to run, the drugged fugitive is easily captured.
what is the ph of a peach with a [ –oh] = 3.2 × 10 –11 m?
Answer:
Amerigo Vespucci, was the first European to reach the Caribbean Islands.
Please select the best answer from the choices provided
T
F
Explanation:
Do you think it is still possible for the Church today to imitate the ways of the early Christians? Give reason for your answer.
Answer:
Explanation:
d president of the conventional signs of doing better Jim and I will be required to pay for the the best regards the team at eight in Hindi homework and always will be I am writing in response.
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like and follow.
Summarize: Complete the following statements:
A. 1 mole of any element contains 6.0221 x 1023 _____
B. 1 mole of any compound contains 6.0221 x 1023 ______
Answer:
Explanation:
Taking into account the definition of Avogadro's Number, the correct answers are:
1 mole of any element contains 6.023×10²³ atoms
1 mole of any compound contains 6.023×10²³ molecules
You have to know that Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression.
Avogadro's number applies to any substance, because the number of elementary units in a mole of a substance is, by definition, a constant that does not depend on the material or the type of particle considered.
So, in this case, the correct answers are:
1 mole of any element contains 6.023×10²³ atoms
1 mole of any compound contains 6.023×10²³ molecules
hope that help you mark me as brinilylist pls
5. Scientists always develop a plan when they try to learn something about our natural world. Which
sequence correctly shows the steps scientists follow in their plan?
A. make observations, develop an idea, obtain evidence, suggest an explanation
B. obtain evidence, suggest an explanation, develop an idea, make observations
C. suggest an explanation, obtain evidence, make observations, develop an idea
D. develop an idea, suggest an explanation, obtain evidence, make observations
It accounts for the differences in the behavior of particles in different states. *
Answer:
Matter
Explanation:
Solids, liquids, and gases are the three types of matter that can be found in the world around us today. In solids, all of the particles are close together. They move more in liquids, but they are spread out in gas.
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Jason completed an experiment and found the materials that conduct electricity and the materials that do not conduct electricity well. He made a table of his findings, but he made one mistake. Review his table, and choose the best answer that will correct the error in his table.
Conducts Electricity Does Not Conduct Electricity Well
Silver necklace
Rubber boot
Cast iron frying pan
Plastic cell phone case
Ceramic coffee cup
Glass cup
A. A rubber boot does not conduct electricity well, so it is in the wrong group.
B. A glass coffee cup conducts electricity well, so it is in the wrong group.
C. A plastic cell phone case conducts electricity well, so it is in the wrong group.
D. A cast iron frying pan does not conduct electricity well, so it is in the wrong group.
Answer:
A.) A rubber boot does not conduct electricity well, so it is in the wrong group.
Explanation:
A glass coffee cup conducts electricity well when it is heated
Answer:
i think the answer is a rubber boot if i am correct
Explanation:
HELP ME PZLMSMS
E
D
D
F
F
Answer:
10.C
11.B
15.A
Explanation:
how did Alexander dye ?
Answer:
After surviving battle after fierce battle, Alexander the Great died in June 323 B.C. at age 32. Some historians say Alexander died of malaria or other natural causes; others believe he was poisoned. Either way, he never named a successor.
Answer:
After surviving battle after fierce battle, Alexander the Great died in June 323 B.C. at age 32. Some historians say Alexander died of malaria or other natural causes; others believe he was poisoned. Either way, he never named a successor
Explanation:
hope it helps
what is the difference between hydrophilic and hydrophobic?
Oxygen-Carbon Dioxide Exchange
Place the statements in the correct
order.
1. heart pumps oxygen-
rich blood to the body
2. carbon dioxide moves
from bronchioles to bronchi
3. air moves through the
bronchi into the bronchioles
4. blood picks up carbon
dioxide from the body
5. INHALE
6. alveoli receive oxygen
to pass to blood
7. heart pumps carbon
dioxide rich blood to the
lungs
8. nose traps germs in air
9. oxygen passes into the
blood
10. air moves down the
trachea
11. alveoli receives carbon
dioxide from the blood
12. oxygen-rich blood flows to
the heart
13. carbon dioxide flows up
the trachea
14. EXHALE
15. carbon dioxide flows out
the nose and mouth
Answer:
Answer is below with the steps in order
Explanation:
4) Blood picks up carbon dioxide from the body
7) Heart pumps carbon dioxide rich blood to the lungs
8) Inhale
9) Nose traps germs in air
10) Air moves down the trachea
3) Air moves through bronchi into the bronchioles
6) Alveoli receive oxygen pass to blood
9) Oxygen passes into the blood
11) Alveoli receives carbon dioxide from the blood
12) Oxygen-rcih blood flows to the heart
3) Carbon Dioxide moves from bonchioles to bronchi
13)Carbon dioxide flows up
1) Heart pumps oxygen-rich blood to the body
The last four of five steps could be switched up a little bit since it all happens synchronously, but this is the most accurate interpretation.
The statements in the correct order are:
4) Blood picks up carbon dioxide from the body7) Heart pumps carbon dioxide-rich blood to the lungs8) Inhale9) Nose traps germs in the air10) Air moves down the trachea3) Air moves through bronchi into the bronchioles6) Alveoli receive oxygen pass to blood9) Oxygen passes into the blood11) Alveoli receives carbon dioxide from the blood12) Oxygen-rcih blood flows to the heart3) Carbon Dioxide moves from bonchioles to bronchi13)Carbon dioxide flows up1) Heart pumps oxygen-rich blood to the body.Oxygen-Carbon Dioxide ExchangeThe lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.
Learn more about Oxygen-Carbon Dioxide Exchange here: brainly.com/question/18521401
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2. The two naturally occurring isotopes of hydrogen are hydrogen-1 ( 1.00783 amu; 99.9885 percent) and hydrogen-2 (2.01410 amu; 0.0115 percent). What is the average atomic mass of hydrogen?
A. 1.0079 amu
b. 1.0097 amu
c. 1.0309 amu
D. 1.5110 amu
Answer:
1.0079 g/mol
Explanation:
99.989% / 100% = 0.99989 hydrigen-1 , 0.0115% / 100% = 0.000115 hydrogen-2
0.99989 x 1.0078 = 1.0077 , 0.000115 x 2.0141= 0.000232
1.0077 + 0.00023
Answer: 1.0079
Which of the following giant covalent structures is a good conductor of electricity?
a) polythene
b) diamond
c) graphite
d) silicon dioixide
What is the mass number (A) of an atom that has an atomic number (Z=26) with 29 neutrons and 26 electrons?
Answer:
A = 55
Explanation:
The atomic number is the number of protons also = the number of electrons, so basically we have 29 neutrons, 26 electrons and 26 protons. Anyway, it's asking the mass number which is the neutrons + the protons, so you just take 29+26 = 55
Atomic number=26
Neutrons=29
Electrons=26
Mass number=Proton+neutron
Protons=26
Mass number=26+29
=55