Answer:
ajansnnddndjsjjenrndndndndndndndnd
pls help ill mark as brainliest :)
Q7. Pb + O2 PbO2
Is this combustion, single replacement, double replacement, synthesis, or decomposition
Answer:
This is a synthesis reaction.
Explanation:
Two elements are bonded together to form (synthesize) a new compound.
3. Which phase change requires the removal of energy? *
(1 Point)
condensation
evaporation
melting
sublimation
answer quick pls
Answer:
I'm pretty sure its condensation The energy absorbed causes the molecules to change patterns. hope i helped
at what temperature does a solid turn into a liquid
Answer:
0°C
Hope this helps Do mark as brainliestAnswer:
a little over 0 degrease cel
Explanation:
Calculate 6890/1230000 and conclude using the correct scientific figure.
Answer:
5.60162×10^−3
what is the original name for gold
Answer:
It's Anglo Saxon.
Explanation:
From the Latin aurum, which stands for Aurora, the dawn goddess, comes the symbol Au. Early humans were aware of and highly valued gold. Gold is a beautiful and valuable metal that has been used for at least 5500 years. The original name for gold is Anglo-Saxon.
The element number 79 for gold is Au. Gold's Latin name, Aurum, or shining morning, and its earlier Greek origins predate the Anglo-Saxon term for it. It is one of the more abundant elements with a higher atomic number and exhibits very little reactivity towards the majority of atmospheric conditions, such as water and air.
Although gold is typically inert, it can react with a substance called aqua-regia. A substance called aqua regia is used to dissolve gold. Nitric and hydrochloric acids are combined to make them. The oxidizing agent will be nitric acid, which will result in the creation of gold ions.
To know more about gold, visit;
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What physical property of the metal rods was being tested during step 4 of the procudure?
4. Measure and record how long it takes heat from the hot plate set on "high" to melt the wax ball.
A.
magnetism
B.
thermal conductivity
C.
electrical conductivity
D.
density
Answer:
B. thermal conductivity
Explanation:
They physical property being tested during the fourth step is the thermal conductivity of the materials.
Thermal conductivity is the ability of a body to transmit heat energy from one place to another.
Since we are measuring how long it takes for heat from the hot plate to reach the wax ball, this is a typical experiment for measuring thermal conductivity. Most metals are good conductors and heat energy moves fast in them.Non-metals are poor conductors with low thermal conductivity.True or False: The isotope with the greatest
abundance contributes to the atomic mass
reported on the periodic table more than
the isotope of lower abundance.
Answer:
True
Explanation:
Greater abundance means there is more of those isotopes, so they contribute to the average number more. The average number is the atomic mass.
An atom can have 2.5 protons, as long as it also has 2.5
electrons.
TRUE. Or
FALSE
A neutral atom has 37 electrons. How many protons does the
atom have?
Answer:
37
Explanation:
because when an element is neutral it contains thesame amount of protons and electrons.
The number of protons in the given neutral atom is 37.
Explanation:
Atom is made up of three subatomic particles: protons, electrons, and neutrons.Protons are positively charged, electrons are negatively charged and neutron has no charge.Atom is electrically neutral as it contains an equal number of electrons and protons.The atomic number of an atom is equal to the number of protons in an atom.The mass of the atom is equal to the sum of the number of protons and the number of neutrons.Given:
A neutral atom with 37 electrons
To find:
The number of protons.
Solution:
Number of electrons = 37
The given atom is neutral, which means that an equal number of protons and electrons are present.
Number of protons = 37
The number of protons in the given neutral atom is 37.
Learn more about subatomic particles here:
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40 POINTS!! Choose all the answers that apply.
Light _____.
travels in longitudinal waves
does not require a medium to travel through
slows down when traveling through more dense substances
speeds up when traveling through less dense substances
can be absorbed and transformed into heat
is refracted when it changes direction and speed
Answer:
The correct answers are:
does not require a medium to travel through
can be absorbed and transformed into heat
is refracted when it changes direction and speed
Hope this helps, have a great day and stay safe! :) :D :3
Answer:
B,E, and F
Explanation:
does not require a medium to travel through
can be absorbed and transformed into heat
is refracted when it changes direction and speed
TRUST : )
what is a limitation of using a chemical formula, such as C6H12O6, to represent a compound?
A.The chemical formula does not show the types of elements that make up the compound.
B.The chemical formula does not show how the atoms are connected to one another.
C.The chemical formula does not show the number of atoms of each element in a molecule.
D.The chemical formula does not show the chemical symbols of the elements in the compound.
Answer:
B
The chemical formula does not show how the atoms are connected to one another
Answer:
b
Explanation:
edge 2020
Differences in states of matter are determined by
particle type
particle arrangement
particle color
distance between particles
Answer:
particle distance
solids are tightly packed
liquids are a little farther apart
and gases are very far
ASAP PLEASE HELP!!
Which substances will make a salt when combined?
A: Vinegar and Tea
B: soda and wine
C: soda and ammonia
D: fertilizer and detergent
Xx thank you! :)
Answer:
c
Explanation:
What is the mass of 1.2 mol IrI3?
Answer:
690 g IrI₃
Explanation:
To convert from moles to grams, you have to use the molar mass of the compound. The molar mass of IrI₃ is 572.92 g/mol. You use this as the unit converter in this equation:
[tex]1.2molIrI3 * \frac{572.92g}{1mol} = 687.504 g IrI3[/tex]
Round to the lowest number of significant figures which is 2 to get 690 g IrI₃.
Question 8 (3 points)
Cindy dropped a test tube during a lab in science class, spilling its contents on the
floor. She immediately picked up the broken glass and used paper towels to clean up
the spill before redoing her lab.
How should she have handled the clean up?
Answer: she should‘ve called the teacher over to deal with it because she could have gotten cut and the chemical could’ve been dangerous
Explanation:
Classify the following chemical reaction
3 C + 4H2→ C3 H8
Answer:
Synthesis Reaction
General Formulas and Concepts:
Synthesis Reactions: A + B → AB
Decomposition Reactions: AB → A + B
Single-Replacement Reactions: A + BC → AB + C
Double-Replacement Reactions: AB + CD → AD + BC
Explanation:
Step 1: RxN
3C (s) + 4H₂ (g) → C₃H₈ (s)
We see here that we are combining 2 elements to form a compound.A would be C, B would be H₂, and C₃H₈ would be ABTherefore, we have a Synthesis ReactionHow many moles are there in 7.4 X 1023 molecules of AgNO3?
Can an Atom be broken down into a smaller substance? Yes or No Explain.
Answer:
Yes
Explanation:
A atom is made out of 3 elements, protons which are positive charges, electrons which are negative charges that swirl around the atom, and a neutron with a neutral charge. The nucleus of the atom is basically the center of the atom.
a piece of metal has a mass of 1.3 g/cm and a has a volume of 24.9 cm3 what is its mass
Answer:
34.611g
Explanation:
mass of metal = ?
density of metal = 1.39/cm³
volume = 24.9 cm³
density = mass/volume
mass = density × volume
= 1.39g/cm³ × 24.9 cm³
= 34.611g
An air-filled balloon shrank when moved from a warm room to a refrigerator. Which statement BEST explains why the balloon shrank?
A. The mass of the air decreased as the balloon cooled.
B. Internal pressure of the balloon decreased due to lower kinetic energy.
C. The volume of air decreased as the number of particles decreased.
D. External pressure on the balloon increased due to lower temperature.
Answer:
B. Internal pressure of the balloon decreased due to lower kinetic energy.
Explanation:
The balloon shrank when moved from the warm room to the cold refrigerator because the internal pressures of the balloon decreased due to lower kinetic energy.
As the balloon approaches the refrigerator, the particles begins to lose their heat energy. The kinetic energy of the particles in a body is directly proportional to the amount of heat. Since we move from a warm to a cold place, the kinetic energy drops too.Calculate the number of moles of neon gas in 8.15 x 10^24 atoms of neon gas.
1.35 moles Ne
0.135 moles Ne
135 moles Ne
13.5 moles Ne
Answer:
13.5 moles of Ne
Explanation:
1 mole of any gas contains 6.02 x 10²³ atoms of gas
6.02 x 10²³ atoms of neon is equal to 1 mole of neon .
8.15 x 10²⁴ atoms of neon is equal to 1 x 8.15 x 10²⁴ / 6.02 x 10²³ moles
= 8.15 x 10²⁴ / 6.02 x 10²³ mole o neon
= 13.5 moles of Ne .
Define a force.......
Answer:
Gravitational Force.
Gravitation is the agent that gives weight to objects with mass and causes them to fall on the ground when dropped.
Answer:
A force is the strength or energy as an attribute of physical action or movement.
Explanation:
In smaller words, a force is a form of energy caused from a push or a pull on an object. A force happens when two objects interact with each other. For example, when you throw a ball you are using force.
Hopefully this helps im sorry if i got it wrong im kinda dumb... XD
HELPPP MEE I NEED HELPP PLEASE
Which person participates mostly in the quaternary level of an economy?
A. A coal miner
3. A car mechanie
C. A college professor
D. A car factory worker
SUBMIT
Answer:
B.Michanine
Explanation:
Answer: The answer is a college professor since people in the fourth level of industry create, share, and store information. They do research, give advice, report on events, and keep records. Furthermore, workers in the quaternary include teachers, librarians, accountants, scientists, and reporters, nor do the traits describe coal miners, car machines, and a car factory worker as these are the secondary level since their work involves manufacturing, make sure to study! You got this have a g’day. Again, the answer is C: A college professor.
Explanation:
You are performing an experiment and produce an unidentified compound. You know it is composed of carbon, hydrogen, and oxygen but you do not know how many of each are present. You determine its relative formula mass is 59 g/mol. What is its molecular formula?
A. C2H3O2
B. C4H3O4
C. CH12O2
D. C3H4O
Answer:
C₂H₃O₂
Explanation:
Given the relative formula mass = 59g/mol
Unknown:
Molecular formula of the compound
Solution:
To identify this compound, let us find the molecular mass of the choices given.
The one that tallies with the number 59 is the solution:
For;
C₂H₃O₂;
Atomic mass of C = 12
Atomic mass of H = 1
Atomic mass of O = 16
Insert the parameters and solve;
Relative molecular formula = 2(12) + 3(1) + 2(16) = 59g/mol
So, the first choice is the compound.
I NEED THESE ANSWERED!!! PLEASEEE!!!!!
Which element am I? Give my symbol ONLY! What a robber says as he's running away!
Answer:
ummmmmmmmmmmmmmmm..mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Explanation:
ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm.................... candyunicorns1999 has left the chat
Answer:
Bi
Explanation:
How could measuring the melting point of a solid help decide whether it was a mixture or a compound?
Answer: It can't.
Explanation:
In most cases, the melting point alone will not enable you to identify a compound. Millions of solid organic compounds, and their melting points, are known. Perhaps 10,000 of these will have the same melting point as your unknown compound.
Hope this helps!
What is the percent composition of sulfur in H2SO4?
2.1%
B)
65.2%
C)
98.1%
D)
32.7%
Answer:
D (32.7%)
Explanation:
Answer:D (32.7%)
Explanation:
A team of geologist learn from GPS data that too continents can I have an ocean between them are moving toward each other Diego‘s little brother hears this and cannot believe that continents can move and is worried that those two continents are going to run into each other how can you explain to him what's happening
Answer:
Kindly check explanation section.
[tectonic activity].
Explanation:
What the team of geologists were talking about is known as the continental drift. The term continental drift which was introduced in the 1500s by people like Abraham Ortelius was mot accepted because the reasons backing it were not sufficient enough. The work on Continental drift was also worked on by people like Charles Lyell, Alfred Russel and Wegener. The term continental shift is used by geologists and other scientists to explain the movement of continents over time. The movement of continents is actually the movement on tectonic plates.
Although the movement of continents has not been accepted generally in those times, there has been modern evidence to back it up such as the record on fossils found in in several continents which are similar.
Diego‘s little brother should be told that different continents move at different rate and the movement is on the tectonic plates.
NEEEDDDD HELP ASAP PLZ PLZ PLZ PLZ PLZ HELP ME
Answer:
[tex]ns^2[/tex]
Explanation: