Answers
Answer:
1.An initial observation is the measurement that you take before you start any process that might cause a change. When you compare your subsequent observations with the initial one, you will see whether any change has taken place, and you will be able to measure the change.
Explanation:
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Related Questions
( BRAINLIEST)
Which Salt is formed when Ammonia reacts with Nitric acid ?
Answers
Answer:
When nitric acid reacts with ammonia, ammonium nitrate is formed.
The accuracy of a measurement
??
Answers
Answer:
-indicates that the measurement is also precise.
Explanation:
Pretty sure it's option 2.
Which state of matter has a definite volume but can change its shape?
A.) Solid
B.)gas
C.)liquid
Answers
Answer:
solid
Explanation:
because solid has a definite shape and volume
Answer:
Liquid
Explanation:
This is because the intermolecular forces of attraction are strong enough to hold the molecules together but not so strong as to fix them into definite positions (as in solids). Instead, they possess fluidity and hence no definite shape.
What system was put into place in 1965 to help people be prepared for future tornados? WILL GIVE BRAINLIEST AND THANKS
Question 2 options:
NOAA
SKYWARN
SKYWATCH
Answers
Answer:
Eas and NOAA is that system
calculate the number of moles of Cu in 2.4x10^21 atoms of Cu
Answers
Answer:
0.004 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.4 \times {10}^{21} }{6.02 \times {10}^{23} } \\ = 0.003986[/tex]
We have the final answer as
0.004 molesHope this helps you
In which state(s) of matter are the
particles free to move at Gut relative to
one another?
Answers
hope this helps!
how many sodium ions designated as dissolved?
Answers
One of the ions has a positive charge (called a cation) and the other has a negative charge (termed anion). Salt is an ionic compound, consisting of a crystal, lattice structure of the two ions Na+ and Cl-.
Why do you sound weird when you hold your your nose and talk?
Answers
Answer:
People with a nasal voice can sound as though they're speaking through a clogged-up or runny nose, which are both possible causes. Your speaking voice is created when air leaves your lungs and flows upward through your vocal cords and throat into your mouth. The resulting sound quality is called resonance. (i hope i helped ya )
Explanation:
The charge of electron cloud of Atom x equals to - 4x10to the power-18 C, write the atomic representation knowing that it has 30 neutrons.
Answers
Answer:
the most common oxidation no.of manganese is + 2 + 3 + 4 + 6 + 7
Explanation:
For a substance to change from a gas to a liquid the particles must _____
Answers
Answer:
The gas particles must touch a cold surface to start to slow down and get closer to form a liquid.
Write an isotope notation for the
most common isotope of nitrogen
and two other isotopes of nitrogen.
Answers
Answer:
Natural nitrogen (7N) consists of two stable isotopes: the vast majority (99.6%) of naturally occurring nitrogen is nitrogen-14, with the remainder being nitrogen-15.
A 50g block of aluminum at -100°C is submerged in 30g of water at 20°C.
Cwater = 4.184 J/gºC
AH tus water = 334 J/g
Cu = 0.89 J/gºC
What is the final temperature of both substances?
Answers
The following is an example of a renewable source of energy:
coal
pretroleum
nuclear energy
hydroelectric
Answers
Answer:
hydroelectric
Explanation:
The word "continental" means that the air mass formed over ____________.
A. land
B. an ocean
C. mountains only
D. a pond
Answers
Answer:
over land is the correct ☑ answer plz mark me as brainliest
have a great day ahead
How many electrons does helium have on the periodic table?
Answers
Answer:
Two Electrons.
Explanation:
Helium is the second element of the periodic table and thus is an atom with two protons in the nucleus. Most Helium atoms have two neutrons in addition to the protons. In its neutral state, Helium has two electrons in orbit about the nucleus. Model of a helium atom's nucleus with two protons and two neutrons.
Hope This Helps!
Answer:
The answer to your question is two electrons.
Explanation:
In its neutral state, Helium has two electrons in orbit about the nucleus.
A sample of Element X is found to contain 82.15% of isotope type 1 (84.9118 amu)
and 17.85% of isotope type 2 (86.9092 amu). Calculate the average atomic
mass.
Answers
Answer:
Have you gotten your answer yet?
The average atomic mass of element X is 85.26 amu.
To calculate the average atomic mass of Element X, we need to take into account the abundance of each isotope and its respective atomic mass.
First, let's assign variables to the abundance and atomic mass of each isotope:
- Isotope 1: abundance = 82.15%, atomic mass = 84.9118 amu
- Isotope 2: abundance = 17.85%, atomic mass = 86.9092 amu
To calculate the average atomic mass, we can use the following formula:
average atomic mass = (abundance₁ ×atomic mass₁) + (abundance₂ ×atomic mass₂)
Substituting the values:
average atomic mass =
[tex]\dfrac{82.15\times84.9118}{100}+\dfrac{17.85\times86.9092}{100}\\=85.26 \ \rm{amu}[/tex]
Thus, average atomic mass of element X is 85.26 amu.
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Define the terms: i proton neutron iii electron. b An atom X has a proton number of 19 and relative atomic mass of 39. i How many electrons, protons and neutrons are there in atom X? ii How many electrons will there be in the outer electron shell of atom X? iii What is the electronic configuration of atom X?
Answers
Answer:
i.Electron should be 19,Proton should also be 19,Neutron should be 20
ii.The outer electron shell should have 9 electrons
iii.Electron Configuration [Ar] 4s¹
1) According to the table, what was the temperature change from start to finish of each material? Styrofoam- metal- paper- plastic-
Answers
styrofoam: 14 degrees
metal: 55 degrees
paper: 25 degrees
plastic: 28 degrees
if they are asking for temperature change, just subtract the last number from the first number to get the difference :)
Answer:
styrofoam would be 14°
metal would be 55°
paper would be 25°
plastic would be 28°
Explanation:
im pretty sure you just take the biggest number and subtract the smallest number. to get how much it has changed.
What is caused by the suns and mom gravitational pull on the earth
Answers
Answer:
earth quakes, tornados, hurricans
How many years are in 500 days?
Round answer to the hundreths place.
Answers
Answer:
1 year
Explanation:
There are 356 days in a year, round to nearest 100 would equal 400.
It's really 1yr and about 4.5 months
Assume a reaction takes place in a basic solution to form the given products:
MnO4–(aq) + Cl–(aq) MnO2(s) + Cl2(g) (unbalanced)
Balance the given half-reactions for atoms and charge:
MnO4– + H2O MnO2 + OH–
Cl– Cl2
Help Please T-T
Answers
Answer:
There is no hydrogen in the first half reaction
What is the unit of measure for the volume of an irregular solid?
Answers
The volume of these objects can be found by water displacement. A volume of water sufficient to cover the object is placed in a graduated cylinder and the volume read. The object is added to the cylinder and the volume read again.
Answer:
Displacement is a method used for measuring the volume of an irregular solid and it is in cubic units.
Someone pls help me with this I will make you brain
Answers
Answer:
g(x) has the greater slope
Determine the element, given the number of protons in an atom
Answers
Atomic number is the number of protons in an atom and you can locate it on your periodic table as the number above the letter. Each element has a different number of protons and because of that you can find the element on the periodic table based on its atomic number.
5HCl what are the number of elements that 5HCl has ?
Answers
Answer:
Penta hydrogen chlorine
Explanation:
they are ploy atomic elements
Explain why it was important for scientists to have a standard system of naming compounds and other chemical procedures.
Answers
It is important for scientists to have a standard system of naming compounds and other chemical procedures to avoid ambiguity in the nomenclature of chemical compounds and procedures.
Chemicals may be referred to by various names among various scientists in different places. These different names creates confusion when scientists present their discoveries to other scientists outside their locality.
Therefore, it is imperative that a unified and standard system of nomenclature should be devised so that all scientists can have the same name for compounds. This reduces ambiguity associated with the nomenclature of chemical substances and procedure.
Learn more: https://brainly.com/question/1157188
Plz help Explain how the fire spreading from tree to tree provides a model for
conduction
B 1
x
X Ω
IC
The Great Fire of 1910 burned through parts of North Idaho,
western Montana, eastern Washington, and southeastern
British Columbia. Many small fires and several large fires that
were started by an electric storm coalesced into one "Big
Blowup" of unprecedented size that lasted two days.
Hurricane-force winds spread the firestorm; trees became
blowtorches, sucking fire from the ground and hurling it in
several directions, spreading the fire on contact. Witnesses
described fireballs being flung like cannons. Trees exploded
like fireworks. The fire killed 87 people, destroyed several
towns in its path, and burned more than three million acres of
forest
f
D
Answers
The Great Fire of 1910 that burned through parts of North Idaho, western Montana, eastern Washington, and southeastern British Columbia serves as a model of conduction as the fire spread from tree to tree without actual movement of the trees away from their position but as a result of contact between the burning flames in the trees.
What are the processes of heat transfer?Heat transfer processes refers to the process by which heat energy is transferred from one point to another within a medium of between two points.
There are three processes of heat transfer, namely:
ConductionConvection, and RadiationConduction is a process of heat transfer in which is transferred from one point to another in a medium without the actual movement of the particles of that medium.
During conduction, the particles of the medium vibrate about a mean position as they acquire heat. This heat energy is then transferred from that particle to the neighboring particle as they particles are in close contact. Hence the heat is transferred from one particle to the next.
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Calculate the mass of scheelite that contains a million oxygen atoms
Answers
Answer:The mass of scheelite having one million oxygen atoms is. Explanation: We are given: Number of oxygen atoms = (million atoms). According to mole .
Explanation:
How many moles of HCl can be produced from 0.207 g of SOC12 SOC12(1) + H2O(1) = SO2(g)+ 2HCl(g)
Answers
Answer:
.80*10⁻³ moles of HCl can be produced from 0.226 g of SOCl₂
Explanation:
The balanced reaction is:
SOCl₂ + H₂O ----> SO₂ + 2 HCl
By stoichiometry of the reaction they react and produce:
SOCl₂: 1 mole
H₂O: 1 mole
SO₂: 1 mole
HCl: 2 mole
Being:
S: 32 g/mole
O: 16 g/mole
Cl: 35.45 g/mole
H: 1 g/mole
the molar mass of the compounds participating in the reaction is:
SOCl₂: 32 g/mole + 16 g/mole + 2*35.45 g/mole= 118.9 g/mole
H₂O: 2*1 g/mole + 16 g/mole= 18 g/mole
SO₂: 32 g/mole + 2*16 g/mole= 64 g/mole
HCl: 1 g/mole + 35.45 g/mole= 36.45 g/mole
Then, by stoichiometry of the reaction, the following amounts of mass react and are produced:
SOCl₂: 1 mole* 118.9 g/mole= 118.9 g
H₂O: 1 mole* 18 g/mole= 18 g
SO₂: 1 mole* 64 g/mole= 64 g
HCl: 2 mole* 36.45 g/mole= 72.9 g
Then the following rule of three can be applied: if by stoichiometry of the reaction 118.9 grams of SOCl₂ produce 2 moles of HCl, 0.226 grams of SOCl₂ how many moles of HCl do they produce?
moles of HCl= 3.80*10⁻³
3.80*10⁻³ moles of HCl can be produced from 0.226 g of SOCl₂
One day, Snoopy bought gas at $2.02 per gallon. How many minutes could Snoopy travel at 55.1 mi/hr if he bought $22.50 of gas and his fuel economy is 22.1 mi/gal?
Answers
Answer:
34
Explanation: