Answer:
44.01
Explanation:
12.01 + 16.00 + 16.00 = 44.01
Which of the following would increase the intensity of the tornado?
a. decrease in wind speed
b. decrease in condensation
c. increased rate of evaporation
d. increase of cold air
What physical property can be used to distinguish between a 1 cm cube of copper
and a 1 cm cube of sugar?
Select one:
a size
b. lustre
C. cost
d state
State physical property can be used to distinguish between a 1 cm cube of copper and a 1 cm cube of sugar. Hence, option D is correct.
What is physical property?A property (such as colour, hardness, boiling point) of the matter is not involved in its manifestation of a chemical change.
Physical properties are those general properties you notice most readily about a substance, such as its size, state of matter (solid, liquid, or gas), colour, mass, density and strength.
Values for physical properties can be determined by tests that don't alter the substance being tested.
Hence, state physical property can be used to distinguish between a 1 cm cube of copper and a 1 cm cube of sugar.
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Why is elemental zinc considered a pure substance?
Select one:
It is a metal.
It is a mixture of different atoms.
All elements are considered pure substances.
It must be created in a lab.
Answer: C... Because Zinc is made of only one type of atoms.
Explanation: All elements are made of one type of atom. Pure gold is made out of only gold atoms, silver out of only silver atoms, etc.
How did humans create cow breeds that survive well in cold weather?
Select one:
O
They identified cows that did well in cold weather and mated them.
O
They mated cows with sheep that had very thick wool.
O
They mated cows with caribou that tolerated the cold well.
O
They identified cows that did well in hot weather and mated them
Answer: They identified cows that did well in cold weather and mated them. This is known as selective breeding. All the other answers either cannot work as cross-species breeds generally don't work, or they target cows that survive well in hot weather.
What is the molar mass of phosphorus pentachloride and uranium hexafluoride?
Answer:
PCl₅ = 208.22g/mol. UF₆ = 352.03g/mol.
Explanation:
Find the atomic mass of each element–and if there's a subscript (you multiply the atomic mass by that much). P= 30.97g, Cl= 35.45g; 30.97+35.45(5) = 208.22g [same idea with UF₆]
what is the formula for this bond?
Which of these are an atom's valence electrons?
Answer:
The Outer-most Electron shell contains the valence electrons.
Bonus Info:
Valence Electrons are used by atoms to make ionic bonds.
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.
Explanation:
ur welcome
i was doing this in school and i watched a video
Describe each of the 3 main
domains used to classify living
things.
Answer:
Organisms can be classified into one of three domains based on differences in the sequences of nucleotides in the cell's ribosomal RNAs (rRNA), the cell's membrane lipid structure, and its sensitivity to antibiotics. 3. The three domains are the Archaea, the Bacteria, and the Eukarya.
Explanation:
What occurs during replication?
O A protein is formed from information in messenger RNA.
A messenger RNA strand is made from DNA.
O A copy of DNA is made from existing DNA.
A copy of DNA is transferred from one organism to another.
Answer:
A
Explanation:
Hopefully this helps
Answer:
A copy of DNA is made from existing DNA.
Explanation:
Just did the quiz
What are the states of matter in precipitation?
Thank you! Have a nice day!
There can be two, solid (Hail) and liquid (Water).
Answer:
liquid and solid
liquid- rain
solid- hail and snow
I don't know about gas; probably not.
what method would you use for your hypothesis.
Worth 50 points. Please answer correctly
Answer:
question 2 is false
Explanation:
6 is D
What is the molecular formula of the molecule that has an empirical formula of CH2O and a molar mass of 120.12 g/mol
Answer:
C4H8O4
Explanation:
Let (CH20)x
C=1*12.01=12.01 (12.01, 1.01, 16.00 Avg mass of elements)
H=2*1.01=2.01
O=1*16.00=16.00
12.01 + 2.01 + 16.00 = 30.03
120.12/30,03=4
==> (CH2O)4 = C4H8O4
The molecular formula of the molecule that has an empirical formula of [tex]CH_2O[/tex] is equal to [tex]C_4H_8O_4[/tex].
Given the following data:
Empirical formula = [tex]CH_2O[/tex]Molar mass = 120.12 g/mol.Scientific data:
Molar mass of oxygen = 16 g/mol.Molar mass of hydrogen = 1 g/mol.Molar mass of carbon = 12 g/mol.To determine the molecular formula of the molecule that has an empirical formula of [tex]CH_2O[/tex]:
First of all, we would find the molar mass of [tex]CH_2O[/tex]:
[tex]CH_2O =12 +(1\times2)+16\\\\CH_2O =30\;g/mol[/tex]
For molecular formula:
[tex](CH_2O)n = 120.12\\\\30n = 120.12\\\\n=\frac{120.12}{30}[/tex]
n = 4.0
[tex](CH_2O)_4 = C_4H_8O_4[/tex]
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How many moles of O, will occupy 1.00 L at a temper-
ature of -118°C and a pressure of 49.77 atm?
Moles of O₂ = 3.92
Further explanationGiven
V=1 L
T=-118 °C + 273 = 155 K
P = 49.77 atm
Required
moles of O₂
Solution
the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
Input the value :
n= PV/RT
[tex]\tt n=\dfrac{49.77~atm\times 1~L}{0.082\times 155}=3.92~moles[/tex]
. How do metals and non-metals
Which two properties of metal enable us to use metal as electric wire
Answer:
it's ductility and it's conductivity
Explanation:
Please I need help I really don’t get this lol
Answer:
The pointer pointing to the grey and white balls are either proton or nuetron i van't really tell cause their grey and white.
The whole clster of balls is the Nucleus
The black balls on the lines are electrons
And the lines are the energy level
Explanation:
define a warm front in your own words
Answer:
type of front formed when a warm air mass pushes a cold air mass, forcing the warm air to slide over the cold air.
How many atoms are in HCOOH₂?
Answer:
11 atoms I think
Explanation:
Answer: 3
Explanation:
I took the test!!
Please select the word from the list that best fits the definition
Measured in grams of solute per gram of solution
concentration
solubility
Answer:
Solubility
Explanation:
Solubility units that incorporate units of solution include grams of solute per 100 grams of solution or grams of solute per liter of solution. Another way to express solubility is in moles of solute per liter of solution; this ratio is called "molarity."
I’ll marmark you brainlist
what is a caterpillar
Answer:
ca ater pillar
Explanation:
there cute little fuzzy guys and they're amazing and beautiful
Elements in group 17 want to lose seven valence electrons and elements in group 1 want to gain seven valence electrons to become stable ions.
PLS HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Neptune
What is the orbit of the Neptune?
Is the Sun at the center of the Nepturn’s orbit?
Describe the motion of Neptune throughout its orbit? Does it move at constant speed?
Answer: with what
Explanation:???
Answer:
165 years.
Neptune completes one orbit around the Sun for every 164.79 orbits of Earth.
Explanation:
Someone help with this ions and isotopes worksheet?
Isotopes are atoms of the same element that have different numbers of neutrons. Protons are positively-charged particles found in the nucleus of an atom.
Electrons are negatively-charged particles found in the outer shell of an atom. The charge on an element is determined by the number of protons and electrons present in the atom.
a.) Li+: number of protons = 3
Number of electrons = 2
charge of Li+ = +1
b.) Be2+: number of protons = 4
Number of electrons = 2
charge of Be2+ = 2+
c.) C4+: number of protons = 8
Number of electrons = 4
charge of C4+ = 4+
d.) O2-: number of protons = 8
Number of electrons = 10
charge of O2- = -2
e.) N3-: number of protons = 7
Number of electrons = 10
charge of N3- = -3
f.) C4- : number of protons = 4
Number of electrons = 4
charge of C4- = -4
g.) 14C6: The mass number = 14
Atomic number = 6
Number of neutrons = 8
h.) 18O8: The mass number = 18
Atomic number = 8
Number of neutrons = 10
i.) 19F9: The mass number = 19
Atomic number = 9
Number of neutrons = 10
j.) 40Ca20: The mass number =40
Atomic number = 20
Number of neutrons = 20
k.) 37Cl17: The mass number = 37
Atomic number = 17
Number of neutrons = 20
l.) 238U92: The mass number = 238
Atomic number = 92
Number of neutrons = 146
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The number placed in front of a compound to balance a chemical reaction is called?
Answer:
coefficients
Explanation:
good luck
which is a greater threat to a mountain ecosystem: a beetle that kills coniferous trees or a wolf thats hunts and eats deer?
Answer:
Explanation:
The mountain ecosystems are characterized by coniferous tree species such as pinus, firs, and spruces and species such as deers, bears, and wolves.
A beetle that kills coniferous trees would be a greater threat to the ecosystem than a wolf that hunts and eat deer because the dominant trees in the ecosystem are conifers. Hence, a beetle that kills coniferous trees might end up killing the dominant tree species in the ecosystem and this will gravely affect other plant and animal species within the ecosystem.
Wolves and deers have their niche in the mountain ecosystem already and hence, their populations are naturally limited by limiting factors of the environment. Hence, a wolf that hunts and eats deers would be of a lesser threat to the mountain ecosystem.
Is zinc radioactive
Answer:
nu
Explanation:
It has five naturally occurring stable isotopes. The most common stable isotope of zinc is Zn-64. Zn-64 has such a long half-life that it radioactive properties are virtually non-existant. ... Zinc is a hard metal, but becomes very malleable above 100 degrees Celsius.
What would happen if a neutron was added to Lithium (7)
Answer:
if you add a neutron to lithium-7 it becomes a compound nucleus of lithium-8
15. An increase in atomic number is related to an increase in atomic mass because
a. more electrons are present in the atomic nucleus
b. more electrons are orbiting the atomic nucleus
c. more protons are present in the atomic nucleus
d. more protons are orbiting the atomic nucleus
Answer:
[tex]\boxed {\boxed {\sf C. \ More \ protons \ are \ present \ in \ the \ atomic \ nucleus}}[/tex]
Explanation:
First, let's define atomic number.
⇒ The number of protons in an atom.
⇒ This number determines the identity and properties of the atom
So, atomic number relates to protons. There is an increase in atomic number, so there must be more protons in the atom. We can eliminate choices A and B, because they pertain to electrons.
We are left with choices C and D. The difference between them is the location of the protons.
Protons are part of the nucleus of the atom: the dense, central region of the atom comprised of nucleons: protons and neutrons.
Electrons, not protons, orbit the nucleus, so D is not correct.
We are left with choice C: more protons are present in the atomic nucleus
when it is cold in your house
Answer:
yep.
Explanation:
I love to wear oversized hoodies and I get soft comfy blankets and watch movies. Have a nice night! :)