Answer:
A pure substance composed of the same type of atom throughout. Compound: A substance made of two or more elements that are chemically combined in fixed amounts.
Oceanography does not include the study of which of the following topics?
A.the relationship between the Sun, Moon, and Earth
B.the relationship between the atmosphere, Earth, and the oceans
C.the Earth's oceans
D.the plants and animals that live in the oceans
Answer:
A. The relationship between the Sun,Moon,and Earth
Explanation:
Which list only includes terms that describe oxygen gas, O2?
A. element, molecule, pure substance
B. atom, compound, molecule
C. atom, element, molecule
D. compound, molecule, pure substance
Answer:
d
Explanation:
it just makes alot of sense and you got this
Oxygen is a gas that belongs to the chalcogen family and is a reactive non-metal. It is an element, molecule, or pure substance. Thus, option A is correct.
What is a pure substance?A pure substance is defined as a substance that cannot be physically separated into its constituent particles. They are known to have a definite and constant chemical composition. It can be a molecule, element, or compound.
An element is atomic species that cannot be broken into simple sub-particles by chemical processes. On the other hand, if an atomic element bonds to the same or different atom it forms a molecule.
Oxygen gas is an element composed of two atoms of oxygen and is a molecule as the two atoms are linked chemically. It is also a pure substance as it contains the same element.
Therefore, option A. oxygen gas is a pure substance, an element, and a molecule.
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The study of Environmental Science includes which of the following?
A.)human biology
B.)the relationship between the Earth and the moon
C.)interactions between humans and living and non-living things in the environment
D.)the study of organisms living in the ocean
Answer:
Hi, There! the Correct Answer is below!
C.)interactions between humans and living and non-living things in the environment
Explanation:
Environmental scientists study subjects like the understanding of earth processes, evaluating alternative energy systems, pollution control and mitigation, natural resource management, and the effects of global climate change. ... Environmental scientists bring a systems approach to the analysis of environmental problems.
____________________________________________________________
Have a wonderful Day :)
~Darkspirit~
Answer:
interactions between human and living and non living things in the environment
solve it and get 50 points
Answer:
Not sure but I think it is C!
Explanation:
A cation of 2 indicates that an element has Group of answer choices lost two neutrons. lost two protons. gained two electrons. lost two electrons. gained two protons.
Answer:
lost 2 electrons
Explanation:
A cation by definition is a positively charged ion. They are formed when a metal loses its electrons. A cation has more protons than electrons, giving it a net positive charge. So, it had to have lost 2 electrons to give it a positive charge of 2⁺.
What is the specific heat of a metal with a mass of 14.0 g, heat of 3.45 kJ and a change in temperature of 6.2 ?
Answer:
Explanation:
0.0
draw the atomic structure of 10 elements and show Electronic configuration.......
Answer:
ज
Explanation:
ूअूिkzkzkksksosawwhsusisisisisisiisisisisisisiisisisis
Which of the following is the correct net ionic equation for the formation of barium sulfate?
O B2+(aq) + SO42- (aq) → BaSO4 (s)
Ba2+(aq) + S2(aq) → Bas(s)
Be2+ (aq) + S042(aq) → BeSO4 (5)
Ba2+(aq) + SO42 (aq) → BaSO4 (5)
Answer:
Ba²+ (aq) + SO4²- (aq) --> BaSO4(s)
The net ionic equation for the formation of barium sulphate is Ba²⁺₍aq₎ + SO₄² ₍aq₎ → BaSO₄₍s₎. Therefore, option D is correct.
What is barium sulphate ?The inorganic substance having the chemical formula BaSO₄ is called barium sulfate. It is a tasteless, crystalline white substance that is insoluble in water. The main commercial source of barium and the materials made from it is the mineral barite, which is where it naturally occurs.
The use of barium sulfate aids in the diagnosis or discovery of issues with the esophagus, stomach, and bowels. It is a contrast material for radiography. To make the various bodily components clearly visible, contrast chemicals are used.
A barite-derived metallic compound with a silvery white color. In barium swallows and barium enemas, it is diluted with water to aid visualize the digestive tract on an x-ray.
Thus, option D is correct.
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What is Displacement reaction . Explain with an example.
Explanation:
A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For instance, when iron is added to a copper sulphate solution, it displaces the copper metal. A + B-C → A-C + B.
How many grams of H2O are produced when 35.0 g of NaOH reacts with 17.5 g of CO,?
2NaOH + CO2 -> Na2CO3 + H2O
Answer:
2NaOH + CO2 -> Na2CO3 + H2O
1) Find the moles of each substance
[tex]\eq n(NaOH)=\frac{35.0}{22.99+16.00+1.008\\}\ =\frac{35.0}{39.998} \ = 0.8750437522 moles\\n(CO_{2} ) = \frac{17.5}{12.01+32.00} = \frac{17.5}{44.01} = 0.3976369007 moles\\[/tex]
2) Determine the limitting reagent
[tex]\\NaOH = \frac{0.8750437522}{2} = 0.4375218761\\\\[/tex]
∴ Carbon dioxide is limitting as it has a smaller value.
3) multiply the limiting reagent by the mole ratio of unknown over known
n(H2O ) = 0.3976369007 × 1/2
= 0.1988184504 moles
4) Multiply the number of moles by the molar mass of the substance.
m = 0.1988184504 × (1.008 × 2 + 16.00)
= 0.1988184504 × 18.016
= 3.581913202 g
Explanation:
The correct answer is = 3.581913202 g.
n(H2O ) = 0.3976369007 × 1/2
= 0.1988184504 moles
m = 0.1988184504 × (1.008 × 2 + 16.00)
= 0.1988184504 × 18.016
= 3.581913202 g.
What does H2O stand for?H2O is the molecular formula of water, also called Dihydrogen monoxide. H2O symbolises two hydrogen atoms and one oxygen atom.
What is 1 mol H2O?
Water (H2O) is made from 2 atoms of hydrogen and 1 atom of oxygen. A mole of water molecules would be 2 moles of hydrogen atoms plus 1 mole of oxygen atoms. From the periodic table, we see the atomic weight of hydrogen is 1.0079 and the atomic weight of oxygen is 15.9994.
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I want the solve of this problem
Answer:
the answer of this question is B
What is the correct clases for this drugs
Promethazine
heelp me please
Answer:
MedlinePlus Drugs Information
Explanation:
Promethazine is in a class of medication called phenothiazines
An organized method scientists use to solve problems and test
hypotheses
hypothesis
scientific process
conclusion
experiment
Explanation:
Hypothesis is answer.
Have a great day
* The 'emf generated by
a copper-constantan thermometer is 15 mv. If the cold junction is at a temperature of 20 degrees celcius.Calculate the temperature of the hot junction when sensitivity
of the thermocouple is 0.03mv/degree celcius
Thermometers are used to measure temperatures. The temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]
Given that:
[tex]EMF = 15mv[/tex]
[tex]T_1 =20^oC[/tex] --- Temperature at cold junction
[tex]s = 0.03mv/^oC[/tex] ---- Sensitivity
The temperature [tex]T_2[/tex] at the hot junction is calculated as follows:
[tex]T_2 = \frac{EMF}{s} + T_1[/tex]
So, we have:
[tex]T_2 = \frac{15mv}{0.03mv/^oC} + 20^oC[/tex]
[tex]T_2 = \frac{15}{0.03/^oC} + 20^oC[/tex]
[tex]T_2 = \frac{15}{0.03}^oC + 20^oC[/tex]
[tex]T_2 = 500^oC + 20^oC[/tex]
[tex]T_2 = 520^oC[/tex]
Hence, the temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]
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Is NaClO4/HClO4 a buffer system
Answer:
In this type of solution, perchloric acid is a strong acid which means that its conjugate base is extremely weak. As such, the solution of HClO4 H C l O 4 and NaClO4 N a C l O 4 is not a buffer solution.
7. Which of the following is not part of the proper protocol for using acids and bases?
A. Wearing protective clothing while handling
B. Storing acids and bases below 10°C
O C. Storing acids and bases in separate areas
D. Add acid to water, not water to acid
Answer:
D. Add acid to water, not water to acid
A student wants to do a scientific research on how a nuclear fusion can be used as a power source on earth. What type of scientist does the student want to become?
A nuclear scientist because they are more focused on extracting the nuclear energy of atoms.
What is the systematic name of the following compound?
Li2S
Choose 1 answer:
А
Lithium sulfate
B В
Lithium sulfide
Dilithium sulfate
Dilithium sulfide
Explanation:
Lithium sulfide
if my answer helps you than mark me as brainliest.
Ammonia is produced by the reaction of nitrogen and hydrogen according to the equation
N2(g) + 3H2(g) → 2NH3(g)
Calculate the mass of ammonia produced when 27.0 g of nitrogen react with 12.0 g of hydrogen.
g NH3
Which is the excess reactant and how much of it will be left over when the reaction is complete?
Explanation:
Ammonia is produced by the reaction of nitrogen and hydrogen according to the equation
N2(g) + 3H2(g) → 2NH3(g)
Calculate the mass of ammonia produced when 27.0 g of nitrogen react with 12.0 g of hydrogen.
g NH3
Which is the excess reactant and how much of it will be left over when the reaction is complete?
PLEASE ANSWER!!!!!!! 80 POINTS
Which statement describes the properties of lanthanoids and actinoids?(1 point)
A. They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
B. They are brittle and dull, and they tend to conduct both electricity and thermal energy.
C. They are brittle and dull, and they tend to be poor conductors of both electricity and thermal energy.
D. They are malleable and lustrous, and they tend to be poor conductors of both electricity and thermal energy.
Lanthanoids and actinoids are transition elements of the periodic table. These elements are lustrous and malleable and can conduct thermal energy and electricity. Thus, option A is correct.
What are lanthanoids and actinoids?Lanthanoids and actinoids are the terms used to refer to the elements of the f-block of the periodic table that are placed separately due to the difference in their electronic structures.
These elements show the property somewhat similar to that of the metals and hence are lustrous and malleable. Due to the transition electron phase, they are used in optical devices and cardiac pacemakers.
The lanthanoids and actinoids are good conductors of heat and electricity as their electrons can be transferred and carry charges like metals.
Therefore, option A. the lanthanoids and actinoids are conductors and are malleable.
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Some groups have names. Enter the number-letter version of the group number for each of these named groups. Be sure to include the number and letter.
a) Alkali metals:
b) Alkaline earth metals
c) Halogens
d) Noble gases 8.
The groups are alkali metals (I), alkaline earth metal (II) , Halogen (VII), and noble gases (VIII).
What is group?The representative elements, also known as the primary group elements, are found in Group A. As a result, the columns beginning with A (IA through VIIIA) are referred to as the primary group elements. The periodic table's columns were referred to as groups.
Alkali metals belongs to group (I).Alkaline earth metals belongs to group (II).Halogens belongs to group (VII).Noble gases belongs to group (VIII)To know more about group.
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please help me with this question i put 100 points on it and i will give brainlyest no links or files or i will report
The Earth’s tilt changes its position relative to the stars and constellations as the Earth rotates around its axis.
What are the products of combining iron (II) and Copper (II) oxide in a Chemical reaction?
oxide in a chemical reaction
CuFe2O4 are the products of combining iron (II) and Copper (II) oxide in a Chemical reaction.
What is chemical reaction?The conversion of one or more chemicals into new one or more chemicals is called chemical reaction.
Example: iron reacts with oxygen to form rust.
What is product?The final substance of chemical reaction is called product.
Example: CuFe2O4 is the final substance called product when iron (II) and Copper (II) oxide react with each other.
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In nature, Chlorine-35 isotopes (35 amu) make up 75
% of all chlorine. Chlorine-37 (37 amu) isotopes make
up 25 % of all chlorine,
Show your calculation for the AVG. Atomic Mass of
chlorine:
What is the Ka expression for HCO3 ?
Water
(liquid)
Pressure (atm)
1
05-
025-
Ice
( (solid)
Water vapor
(gas)
10
101
100
Temperature (°C)
What do the sections between the lines on a phase diagram represent?
A. The regions in which temperature and pressure change a
substance's phase
B. The conditions in which a substance exists in a certain phase
C. The ranges where temperature and pressure are constant in a
substance
D. The areas in which the kinetic energy of a substance is constant
Answer:A
Explanation:
Convert 50 kilograms into grams.show your work
Answer:
50000 g
Explanation:
1 kilogram (kg) is equal to 1000 grams (g).
1 kg = 1000 g
The mass m in grams (g) is equal to the mass m in kilograms (kg) times 1000:
m(g) = m(kg) × 1000
Things around you. All around you there is matter. The chair you are sitting on, air and
water are all matter. Almost everything that you see is matter. Anything that has mass
and takes up space is called matter.
What do we call something that has mass and takes up space?
Answer:
Hi Lovelys!!
Answers down below!!
Explanation:
There are two answer my me: Matter and Volume
Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia (resistance to change in the motion of an object).
Volume simply refers to the space an object takes up. Depending on the physical state of an object, there are a couple ways to measure volume. If we are trying to measure the volume of a box, for instance, we would multiply the length of the box by its height and by its width.
Hope this helps!! =3
Have a wonderful day, evening, or night!! <3
If the PH is 5.85.how do I calculate for an acid ?[H^+]
Answer:
if its under 7 then it's an acid you neek over 7 is alkaline
If you wanted to increase the speed of
vaporization, you could
A. put the substance in the freezer.
B. place a lid on the substance.
C. heat the substance to the boiling point.
D. cool the substance to the freezing point.
>
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Answer:
C. heat the substance to the boiling point.
Answer:
heat the substance
Explanation: