Answer:
Ecosystem
Explanation:
The levels of organization from lowest complexity to highest are:
species, population, community, ecosystem
What is the percent water in the compound CaCl2 2H2O ?
Answer:
147.1g
Explanation:
Which of the following items are factors that influence reaction rates? Select all that apply.
Question 2 options:
Surface Area
Concentration
Temperature
Catalyst
Light
Answer:
temperature
catalyst
surface area
In an ionic bond, which
category of elements are giving away
electrons?
Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion
Answer:
Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion.
hope it is helpful u in understandingplz mrk it as brainliest.4.How element gold is different from oxygen?
Answer:
Gold is a metal, more specifically a transition metal, whereas Oxygen is a nonmetal, more specifically a reactive nonmetal. Using this information, you can compare and contrast metals, nonmetals, and metalloids.
Metals are:
Shiny
High melting point
Mostly silver or gray in color
Mostly solids at room temperature – Mercury (Hg) is a liquid at room temperature
Malleable – able to be hammered into a thin sheet
Ductile – able to be drawn/pulled into a wire
Good conductors of heat and electricity
Nonmetals are:
Dull
Low melting point
Brittle – break easily
Not malleable
Not ductile
Poor conductors of heat and electricity
Metalloids are:
Found on the “zig-zag” line on the Periodic Table of Elements
Have properties of both metals and nonmetals
Can be shiny or dull
Semiconductors – able to conduct electricity under certain conditions
Explanation:
Reccomend this site for questions llike these: https://ptable.com/#Properties
Does a animal cell have cytolysis?
Answer:
The presence of a cell wall prevents the membrane from bursting,so cytolysis only occurs in animal and protozoa cells which do not have cell walls.
Explanation:
12.0 g NaHSO4 (MM: 120.1 g/mol) is dissolved in water to make a 2.00 L solution. What is the molarity of the resulting NaHSO4 solution?
Answer:
0.05 M
Explanation:
First we convert 12 g of NaHSO₄ into moles, using the given molar mass:
12 g NaHSO₄ ÷ 120.1 g/mol = 0.10 mol NaHSO₄We can now calculate the molarity of the resulting solution, using the calculated number of moles and the given volume:
Molarity = moles / litersMolarity = 0.10 mol / 2.00 L = 0.05 MAnswer:
The molarity of the resulting NaHSO₄ solution is 0.05 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molar mass is the amount of mass that a substance contains in one mole. Being the molar mass of the compound NaHSO₄ equal to 120.1 g/mole, then the number of moles that 12 grams contain is calculated by:
[tex]12 g*\frac{1 mole}{120.1 g} = 0.1 moles[/tex]
And being 2 L the volume of the solution, then replacing in the definition of molarity you get:
[tex]Molarity=\frac{0.1 moles}{2 L}[/tex]
Molarity= 0.05 [tex]\frac{moles}{liter}[/tex]
The molarity of the resulting NaHSO₄ solution is 0.05 [tex]\frac{moles}{liter}[/tex]
1.25 x 10^25 atoms of magnesium = ? moles of magnesium
Describe the relationship between the potential difference across the resistor and
the current through the resistor.
Ohm's Law states that for a linear circuit the current flowing through it is proportional to the potential difference across it so the greater the potential difference across any two points the bigger will be the current flowing through it.
(I'm happy)
Which substances in the list can be used to write a complete combustion reaction? (4 points)
O 1, 2, and 3
O 2, 3, and 6
O 1, 4, and 5
O 1, 2, and 5
Answer:
B. 2, 3 and 6
Explanation:
The primary materials for a chemic combustion reaction are Fuel + O2 → CO2 + H2O!
Hope this could help! （*＾ワ＾*）
Answer:the answer is B
Explanation:
How many moles of AgNO3 must react to form 0.854 mol Ag?
mol AgNO3
Answer:
0.854
Explanation:
The equation of its dissolution in water is: AgNO3 → Ag + (aq) + NO3- (aq)
and AgNO3 → Ag + (aq) + NO3- (aq)
1 mol 1mol 1mol
? -------- 0.854mo
so for finding the value, it is sufficients to complute 1 x 0.854 mol =0.854 mol
so, 0.854 mol is required for the reaction to form 0.854 mol of Ag
Some elements exhibit high electrical
conductivity. How would you expect
them to be characterized?
Answer:
Metal
Explanation:
Joy mixes one cup of sugar and one cup of lemon juice into three cups of water. The solvent in this recipe is the?
Answer: Water is the solvent in this recipe.
Explanation: A solvent is " a molecule that has the ability to dissolve other molecules". Lemon juice and sugar are solutes.
See photo! Calculating mass and percentage yields.
Answer:
see above
Explanation:
check for cfe's
A mixture of helium, nitrogen and oxygen has a total pressure of 781 mmHg. The partial pressure of helium is 331 mmHg, and the partial pressure of nitrogen is 222 mmHg. What is the partial pressure (in mmHg) of oxygen in the mixture?
Answer:
Partial pressure of O₂ = 228 mmHg
Explanation:
The mixture is made of three gases, He, N₂ and O₂.
Total pressure of it, is 781 mmHg.
There is a law from gases, that indicates the sum of partial pressures of each gas in a mixture will be the total pressure of the system. In conclussion:
Partial pressure of He + Partial pressure of N₂ + Partial pressure of O₂ = Total pressure.
331 mmHg + 222 mmHg + Partial pressure of O₂ = 781 mmHg.
Partial pressure of O₂ = 781 mmHg - 331 mmHg - 222 mmHg
Partial pressure of O₂ = 228 mmHg
I need help with the balancing one
Answer:
2Na2S + Cd(NO3)2 ---> CdS + 2NaNO3
The coefficients therefore are 1,1,1&2
An alpha particle is composed of He2+ ions?
true or false
Answer: The given statement is False.
Explanation:
Alpha particle is a helium nuclei.
Alpha particles are produced when a larger nuclei decays into smaller nuclei in radioactive decay. Alpha particles have mass number and atomic number as 4 and 2 respectively.
General representation of alpha decay :
[tex]^A_Z\textrm{X}\rightarrow ^{A-4}_{Z-2}\textrm{Y}+^4_2\textrm{He}[/tex]
Thus the given statement that alpha particle is composed of [tex]He^{2+}[/tex] ions is False.
The statement of [tex]\rm He^2^+[/tex] ions has formed the alpha particles is true.
Alpha particles are particles that have been similar to the He-4, with the presence of two protons and two neutrons. The alpha particles have the absence of electrons and have been formed during the alpha decay.
[tex]\rm He^2^+[/tex] has been the ion of He with the positive charge indicating the loss of 2 electrons. Thus, in [tex]\rm He^2^+[/tex], there has been 2 protons, 2 neutrons, and 0 electrons.
The atomic configuration of [tex]\rm He^2^+[/tex]has been similar to the alpha particles. Thus, the statement stating, "the alpha particles to be composed of [tex]\rm He^2^+[/tex]ions " is True.
For more information about the alpha particles, refer to the link:
https://brainly.com/question/1685421
Which of the following is a potential disadvantage of using wind energy? (2 answers)
A)It has potential to kill fish caught in the turbines
B)The source of energy can sometimes be inconsistent
C)It alters migratory bird routes
D)It is influenced by the amount of cloud cover
E)It releases high amounts of carbon dioxide when used
Answer:
It's probably b
Explanation:
(I'm wrong aren't I)
Dalton's contribution was different from thatof the ancient Greek who postulated the existence of atoms. Point out the differences between the two ideas
Answer: Democritus atomic theory is the ancient theory that describes the nature of matter in terms of atoms whereas Dalton atomic theory is a modern scientific theory that describes the nature of matter in terms of atoms. According to Dalton's theory, atoms are identically same, but Democritus had no idea about it. Atoms are never created nor destroyed, they just rearrange.
Explanation:
What does a hygrometer measure?
Answer:
humidityExplanation:
Hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.
Can someone tell me if these are right? I am supposed to be decoding this for my escape room but it seems to be wrong.
Answer:
Q1 is A.
Q2 is right
Q3 is D.....I dont
really know about this one
Q4 is right
if 13 moles of Fe react, what is the mass of FeS produced?
Answer:
1144 g of FeS
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Fe + S —> FeS
From the balanced equation above,
1 mole of Fe reacted to produce 1 mole of FeS.
Therefore, 13 moles of Fe will also react to produce 13 moles of FeS.
Finally, we shall determine mass of 13 moles of FeS. This can be obtained as follow:
Mole of FeS = 13 moles
Molar mass of FeS = 56 + 32
= 88 g/mol
Mass of FeS =?
Mass = mole × molar mass
Mass of FeS = 13 × 88
Mass of FeS = 1144 g
Therefore, 1144 g of FeS were obtained from the reaction.
2. This chart describes several characteristics of human civilizations.
(6.04)
Characteristics of Human Civilizations
Stable Food Supply
?
Developed Systems of Writing
Which phrase best completes this list?
A. Created militaries
B. Complex social structures
C. Use of fire for protection
D. Declining population
classify the following elements under metals, non metals and metalloids, boron, zinc Mercury, silicon, oxygen, nitrogen, sodium
Answer:
Zinc mercury transition metal
Silicon boron metalloid
Oxygen nitrogen non metal
Sodium alkali metal
Explanation:
Calculate the concentration of a 220 g solution of calcium chloride (CaCl2) that has a volume of 11 L
Answer: The concentration of the solution is 0.18 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in L
moles of [tex]CaCl_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{220g}{111g/mol}=1.98mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{1.98mol}{11L}=0.18M[/tex]
Therefore, the concentration of the solution is 0.18 M
what are the difference between hemogeneous mixture and heterogeneous mixture ??
Answer:
Refer to attached file below
Hope it helps..
Have a great day :P
A physical change to a substance
can never be reversed
increase or decrease the mass of a substance
changes to type of matter the substance is made of
changes one or more of the physical properties of a substance
Answer:
4th one
Explanation:
a physical change is something u can see, so if the substance changes its properties then thats a physical change.
"pure water does not conduct electricity. But some tap water probably can. Which best explains this?" a . Tap water is H20 b . Pure water is H20 c . Some tap water has minerals, such as iron in it.
Explanation:
"pure water does not conduct electricity. But some tap water probably can."
The reason why pure water does not conduct electricity is due to the absence of mineral and metal containing salts. Pure water is made up of only Hydrogen and oxygen atom as represented by the formula; H2O
Tap water on the other hand are most likely able to conduct electricity due to the presence of these ions. They may arise from impurities or during treatment processes.
The correct options are;
b . Pure water is H2O
c . Some tap water has minerals, such as iron in it.
True or False: Ionic bonding means atoms COMPLETELY GIVE AWAY OR TAKE their electrons from each other. *
Answer: The given statement is True.
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
Thus the given statement is True.
two types of subatomic particles in the nucleas of an atom
Explanation:
protons and neutrons.....
...
Answer:
The subatomic particles are Protons and Neutrons.
Living organisms need energy to carry on their life processes. Photosynthesis is a process that allows for photosynthesizing organisms, such as algae and green plants, to produce their own materials for energy production and survival. This process can be outlined as a simplified chemical equation containing reactants (goes into the process) and products (made/comes out of the process).Using your knowledge of science and figures above, select the choice that accurately expresses photosynthesis.
the correct combo is C
We know sunlight is key factor in photosynthesis so A and D are out.
we also know plants get their bulk by breaking up co2 and using the carbon which releases oxygen as a byproduct so B is also out of the question.