Answer:
2
Explanation:
because it same volume
this happens in massive star which convert hydrogen into helium?
Answer:
nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle).
Which compound forms a powerful acid and contains a halogen
Answer:
B I already know this
Explanation:
What is the difference between a mixture and a compound ??
Answer:
Explanation:
Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.
Which of the following elements would be most
likely to be both conductive AND magnetic in nature?
A. F
B. Ni
C. Na
D. Xe
Answer:
Ni ➡️Nickel
Explanation:
The element that is most
likely to be both conductive AND magnetic in nature is "Nickel".
Nickel is a popular magnetic metal and it is known to be ferromagnetic. It's valuable in alloys and used in the production of stainless steel. The element belongs to the transition metals - hard, malleable and ductile. It has high electrical and thermal conductivity.
The element finds usefulness in batteries, phones, kitchen tools, jewellery, etc.
What is the formula weight (amu) of the molecule H2O? Use atomic masses of H and O as 1.008 amu and 16.00 amu respectively. Report answer to 4 sig figs.
Answer:
Formula weight of H₂O molecule is 18.02 amu.
Explanation:
Given data:
Formula weight of H₂O = ?
Atomic mass of H = 1.008 amu
Atomic mass of O = 16.00 amu
Solution:
Formula weight:
"It is the sum of all the atomic weight of atoms present in given formula"
Formula weight of H₂O = 2×1.008 amu + 1×16.00 amu
Formula weight of H₂O = 18.02 amu
Thus, formula weight of H₂O molecule is 18.02 amu.
Why are some elements no longer found on earth
Answer:
They go extinct
Explanation: When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct (Take dinosaurs for example besides there death)
The elements no longer found on earth are extincted.When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct.
What is element?An element is a atom's species that consist of proton in a proper number embeded in their nuclei, as well as pure substance a species consist of pure substance.
Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6.The atomic structure of carbon is designed in such way that it contain 6 electron, 6 protons, and 6 neutrons.
The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .The main function of carbon compounds to maintain earth's atmosphere and temperature and to supply energy that works as fuel for our economy.
The atomic structure of carbon is designed in such way that it contain 6 electron, 6 protons, and 6 neutrons.The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .
Therefore,The elements no longer found on earth are extincted.When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct.
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Round 9.9100881 × 101 to 6 significant digits in decimal form.
Answer:
Round to six significant = 1000.92
Explanation:
Given data:
Given value = 9.9100881×101
Round given value to six significant figures
Solution:
Significant figures:
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
How to round the digits:
First we will look at the six digit of given values.
we will draw a line after six digit then we will look the digit after line.
It the digit after line which is 7th digit is 5 or more than 5 then one will be added to the six digit.
If it it is less than five then six digit remain same.
After this we will add zeros to the right till decimal point.
In given measurement:
9.9100881×101 = 1000.9188981
1000.9188981
Six digit is 1 and 7th is 8 thus 1 is converted into 2.
Round to six significant = 1000.92
What is a material that you cannot see through called?
Answer:
metal
Explanation:
PLEASE HELP!!
The scientific method is a process that scientists use to investigate something in the natural world. Which of these best describes the difference between a scientist collecting data and analyzing data?
A -When a scientist collects data the hypothesis is compared to the data. When a scientist analyzes data, data are analyzed, scientists predict future experiments.
B - When a scientist collects data, the scientist develops new ideas for experiments. When a scientist analyzes the data, he or she looks at what could be improved in the investigation.
C - When a scientist collects data, the data include the observations made during the experiment. When a scientist analyzes the data, the scientist communicates his observations to other scientists.
D - When a scientist collects data, he or she record the data from an experiment. When a scientist analyzes the data, he or she decides whether or not the data support the hypothesis.
Answer:
I believe D is the best answer choice.
Explanation:
C is also a good answer but I feel like D most accurately describes the scientific method.
Answer:
C
Explanation:
its true and contains more academic words and i got it right
Item 3
Which part of the cell contains the genetic instructions and information?
pores
nucleus
cell wall
plasma membrane
Answer: B.
Explanation:
The nucleus is a membrane-enclosed organelle found in most eukaryotic cells. The nucleus is the largest organelle in the cell and contains most of the cell's genetic information (mitochondria also contain DNA, called mitochondrial DNA, but it makes up just a small percentage of the cell's overall DNA content).
Hope this helps!
Answer:
nuke-leus
Explanation:
This is how manganese appears in the periodic table.
What is the arrow is pointing to?
period symbol of manganese
isotope symbol of manganese
group symbol of manganese
atomic symbol of manganese
Answer:d
Explanation:took the test
The arrow in the statement is likely pointing to the atomic symbol of manganese, which is the letter "Mn." Therefore, option (D) is correct.
In the periodic table, elements are organized based on their atomic number, which corresponds to the number of protons in the nucleus of an atom. Manganese has an atomic number of 25, indicating that it has 25 protons. The atomic symbol is a shorthand representation of the element's name, allowing for easy identification and reference.
Therefore, the arrow is pointing to the atomic symbol of manganese, "Mn," indicating its position in the periodic table and distinguishing it from other elements. The atomic symbol is a fundamental component of the periodic table, enabling scientists to communicate and study elements and their properties more efficiently.
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24 of 30
19
20
21
22
23
24
25
26
27
28
Which feature can distinguish between an elemental molecule and a compound molecule?
whether the molecule is formed from at least two atoms
O whether the molecule is formed by the sharing of electrons
O whether the molecule is a gas or a liquid
O whether the molecule is made from different types of atoms
Answer:
whether the molecule is formed from at least two atoms
Explanation:
A feature that distinguishes an elemental molecule and a compound molecule is whether the molecules are formed from at least two atoms.
An elemental molecule is a molecule that contains two or more of the same kind of elements.
A compound molecule contains two or more different kinds of molecules.
An example of elemental molecule is oxygen gas, O₂. An example of a compound molecule is water H₂O.A molecule is a unit of a compound that can represent such a compound.
Therefore, what distinguishes an elemental molecule from a compound molecule is whether a molecule forms from at least two atoms.
What is the atomic number of an atom?
Answer:
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
Explanation:
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
Explanation:
The atomic number is number on the right side
A material will float on the surface of a liquid if the material has a density less than that of the liquid . Given that the density of water is 1.0g/mL will a block of material with a volume of 27.3mL and a mass of 380g sink or float in water .
Answer:
the mass will sink.
Explanation:
because the block of material is still more dense.
how are heavy elements such as carbon, oxygen,and neon formed during star formation?
Answer:
Neutron star collisions
What do any two samples of the element mercury (Hg) have in common?
A.the same mass
B.the same volume
C.the same type of atoms
D.the same number of electrons
Answer:
C
Explanation:
The same types of atoms
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option C.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus of an atom, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The two samples of the element mercury (Hg) will have same type of atoms.
Therefore, the correct option is option C.
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What is the volume mL of 2 degree celsius?
Answer:
Question not very specific, but here is an answer you might be looking for. Density of object at 2 degrees C, 0.99997 g/mL. Hope it IS the answer you are looking for!
Explanation:
E. Give evidence to support or dispute: "In nature, the chance of finding one isotope
of an element is the same for all elements." (this objective is completed by
responding to question 2 below)
Answer:
This question appears incomplete
Explanation:
However, the chance of finding one isotope of an element is not the same for all elements because some elements/isotopes are more in abundance than some other elements/isotopes; for example the most abundant element on earth is nitrogen-14, hence the chances of finding nitrogen-14 in nature is higher the chances of finding any isotope of Xenon.
Also, while isotopes occur naturally, some do not. Hence, the chances of finding a naturally occurring isotopes (no matter how rare like Xenon-126) is higher than the chances of finding artificial radioisotopes like technetium-95 and promethium-146 (whose chances are zero because they cannot be found naturally occurring).
Help out ? Will mark brainliest!!!!!!!
Answer:
32000 pounds
14741.752 kilograms
14741752 grams
16.25 tons
In this lesson, you learned about the properties that distinguish one element from another.
In this assignment, you will describe elements, isotopes, and ions.
What changes a liquid to a gas?
Answer:
evaporation
Explanation:
Answer:
boiling (or vaporization)
Explanation:
At a certain temperature, the particles in a liquid have enough energy to become a gas. This process of a liquid becoming a gas is called boiling (or vaporization.)
Into which layer of the Earth do plate boundaries extend?
outer core
lithosphere
lower mantle
asthenosphere
Answer:
lithosphere
Explanation:
I am big Brain
What is the molar mass of an unknown gas with a density of 2.00g/L at 1.00 atm and 25.0C
Answer:
Explanation:1. A 2.650-g sample of a gas occupies a volume of 428 mL at 0.9767 atm and 297.3 K. What is its molar mass?
2.
a. A sample of nitrogen gas has a volume of 10.0 L at 2.50atm and 50.0℃. If the pressure is increased to 5.00 atm and the temperature decreases to 25.0℃, what volume does the gas occupy?
(a). 5.00L, (b).4.61L, (c).2.50L, (d).5.42L
b. Using the average bond energy, calculate the enthalpy of the above reaction. draw Lewis structures of the reactants and products first to determine the exact bond order. N2(g)+3H2(g)→2NH3(g)
Elements are identified by their atomic number because
A.the mass of an element changes over time.
B.the number of protons remains constant.
C.atoms of the same element have different numbers of neutrons.
D.elements in a group react in a similar way.
Answer:
The atomic number stands for the number of protons in an atom of the element.
The number of protons determines the identity of the element,
So the atomic number identifies the element. GOOD LESSONS ♡
What causes hurricanes in the northern hemisphere to roster counterclockwise ?
-ocean temperatures
-the saffir-Simpson scale
-the strength of the eyewall
-the coriolis effect
Answer: The answer is D.
Explanation:
As the air rushes toward the center, it winds up moving in a curved path thanks to the Coriolis effect. This creates a circular spinning pattern as air travels from areas of high pressure to low pressure. That's why hurricanes originating in the northern hemisphere rotate counterclockwise.
Hope this helps!
Calculate the number of moles in 144 g of P. Please show your work to receive credit.
Answer:
144 g of phosphorus contain 4.65 moles.
Explanation:
Given data:
Mass of phosphorus (P) = 144 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of phosphorus is 31 g/mol
Now we will put the values in formula.
Number of moles = 144 g/ 31 g/mol
Number of moles = 4.65 mol
Thus, 144 g of phosphorus contain 4.65 moles.
CHEMISTRY! 50 POINTS! What is the original pressure of 20.0L of compressed gas if the pressure changes to 560.0mmHg when the volume is decreased to 15700mL?
Answer:
The answer is 439.60 mmHgExplanation:
To find the original pressure we use the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the original pressure
[tex]P_1 = \frac{P_2V_2}{V_1} \\[/tex]
From the question
V1 = 20 L = 20,000 mL
P2 = 560.0mmHg
V2 = 15700mL
We have
[tex]P_1 = \frac{560 \times 15700}{20000} = \frac{8792000}{20000} = \frac{2198}{5 } \\ [/tex]
We have the final answer as
439.60 mmHgHope this helps you
List the official SI units
Answer:
The seven SI base units, which are comprised of:
Length - meter (m)
Time - second (s)
Amount of substance - mole (mole)
Electric current - ampere (A)
Temperature - kelvin (K)
Luminous intensity - candela (cd)
Mass - kilogram (kg)
Explanation:
Answer:
The seven SI base units, which are comprised of:
* Length - meter (m)
* Time - second (s)
* Amount of substance - mole (mole)
* Electric current - ampere (A)
* Temperature - kelvin (K)
* Luminous intensity - candela (cd)
* Mass - kilogram (kg)
Explanation:
Hope this helps :)
Plz, give me brainliest if u can... if I'm right, idrc if u do or not, just askin.
For a reaction Y → X with a very high equilibrium constant, K, which of the following is true? You can refer to the following two equations in formulating your answer.$$$$Choose one:A. The standard free-energy change is large and positive.B. The amount of product and substrate are equal at equilibrium.C. The forward reaction rate greatly exceeds the reverse reaction rate at equilibrium.D. The amount of product will be higher than the amount of substrate at equilibrium.
Answer:The amount of product will be higher than the amount of substrate at equilibrium
Explanation:
Recall that the equilibrium constant K depends on the amounts of reactants and products present in the system at equilibrium.
Considering the equation; K = [X]/[Y], as the concentration of X increases above that of Y, the equilibrium constant K becomes very high, hence the answer above.
35 POINTS PLZ HELP FAST
Suppose a new island is discovered with previously unknown species. What lines of evidence would you look at to determine how they are related to known species.
Answer: DNA, developmental similarity, and similarities in body structure.
Answer:
the answer is
-DNA
-Development
-Similarity
-Similarities in body structure
Explanation:
I hope this helped have a good day❤