Answer:
reproduction
Explanation:
can be asexual or sexual
2. The most useful property of metalloids is their
a. Varying ability to conduct electric current.
b. Softness and malleability.
c. Tendency to be unreactive.
d. Ability to be pulled out into long wires.
Answer:
it is D
Explanation:
An element that is brittle but is a moderate conductor of electricity is classified as a.... non-metal, metal or metalloid, metalloid, metal
Answer:
non metal
Explanation:
HOPE THIS HELPS!!!
How much heat is released when the temperature of 60g water decreases from 75 Celsius to 27 Celsius?
Answer:
The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state or phase change. Sensible heat is measured by the expression:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
Q= ?c= 4.184 [tex]\frac{J}{g*C}[/tex]m= 60 gΔT= Tfinal - Tinitial= 27 C - 75 C= - 48 CReplacing:
Q= 4.184 [tex]\frac{J}{g*C}[/tex] *60 g* (-48 C)
Q= -12,049.92 J
The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.
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If a sample of 2 moles of nitric oxide gas was reacted with excess oxygen, how many moles of nitrogen dioxide would be produced?
Answer:
If a sample of 2 moles of nitric oxide gas was reacted with excess oxygen, 2 moles of nitrogen dioxide would be produced.
Explanation:
The balanced reaction is:
2 NO + O₂ → 2 NO₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
NO: 2 molesO₂: 1 moleNO₂: 2 molesThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop. By reaction stoichiometry, if a sample of 2 moles of nitric oxide gas was reacted with excess oxygen, 2 moles of nitrogen dioxide would be produced.
Excess reagents are reactants that do not completely vanish after the reaction is complete. Moles of nitrogen dioxide produced is 2 moles.
What is limiting and excess reagents?In a chemical reaction when the reactant is left and is not completely consumed after the formation of the product is called excess reagents.
The reactants or the reagents that get consumed first in the reaction and limit the product formation is called limiting reagent.
The balanced chemical reaction can be shown as,
[tex]\rm 2NO + O_{2} \rightarrow 2NO_{2}[/tex]
The stoichiometry coefficient gives the moles of the reactant and the products as,
Moles of nitric oxide = 2 molesMoles of oxygen = 1 moleMoles of nitrogen dioxide = 2 molesAccording to the reaction if the 2 moles of nitric oxide reacts with an excess of the oxygen gas then 2 moles of [tex]\rm NO_{2}[/tex] is produced.
Therefore, moles of nitrogen dioxide produced is 2 moles.
Learn more about limiting and excess reagent here:
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Which step of the engineering process would involve monitoring a new drug
as it is released to the public?
A. Testing
B. Looking for improvements
C. Screening
D. Evaluating test results
Answer: B. Looking for improvements
Explanation:
Answer:
B. Looking for improvements.
Explanation:
A student uses a magnet to move a 0.0 25 KG metal ball the magnet exerts a force of five in which causes the body to begin moving what is the acceleration of the ball when it begins to move
Answer:
The acceleration of the ball when it begins to move is 200 m/s²
Explanation:
The given parameters are;
The mass of the metal ball, m = 0.025 kg
The force exerted by the magnet on the ball, F = 5 N
From Newton's second law, F = m × a
Where;
a = The acceleration of the ball
Therefore, by substitution, we have;
5 = 0.025 × a
a = 5/0.025 = 200 m/s²
The acceleration of the ball when it begins to move = 200 m/s²
This type of bonding can be described as a "cooperation" A. lonic B. metallic C. covalent
Answer:
Covalent
Explanation:
C. Covalent
The type of bonding which can be described as a "cooperation" is covalent bonding as there is sharing of electrons.
What is covalent bonding?
Covalent bonding is defined as a type of bonding which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
Learn more about covalent bonding,here:
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Please help!!!! Thank you
How many molecules of N₂O₄ are in 7.016 kg N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol. [Hint: kg] *
4 points
7.26 × 10²³ N₂O₄ molecules
1.38 × 10²⁴ N₂O₄ molecules
5.54 × 10²⁵ N₂O₄ molecules
4.59 × 10²⁵ N₂O₄ molecules
4.99 × 10²³ N₂O₄ molecules
Answer:
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Explanation:
Elements Atomic Mass (u)
Hydrogen 1
Carbon 12
Nitrogen 14
Oxygen 16
Sodium 23
Magnesium 24
Sulfur 32
Chlorine 35.5
Calcium 40
actor Atoms Molecules
Definition Most fundamental and smallest part that can exist of an element. Two or more atoms chemically bonded together.
Example Oxygen – O
Phosphorus – P
Sulphur – S
Hydrogen – H Oxygen – O2
Phosphorus – P4
Sulphur – S8
Water – H2O
Structure The smallest particle with properties of an element. Combination of two or more atoms.
Stability An atom may not always be stable in nature due to the presence of electrons in the outer shells. Molecules are formed to attain stability.
Constituent Elements Protons, Electrons & Neutrons Two or more atoms of the same or different elements
Reactivity Except for the noble elements, atoms of all elements showcase a certain level of reactivity. Compared to a molecule, the level of reactivity is less than some valence points are filled by electrons of combined elements.
which one of these elements is a liquid at room temperature.
B
Sr
Hg
Sb
??????????? help please
Answer:
B. Cl₂ + NaBr → NaCl + Br₂
Explanation:
The single replacement chemical equation that is unbalanced is Cl₂ + NaBr → NaCl + Br₂.
A look at the equation and you will discover that the chlorine on the reactant side is not balanced with the one on the product side. The chlorine at the reactant side has 2 atoms of chlorine but just 1 atom of chlorine in the product side. Therefore, it is unbalanced. Also, you will discover that the bromine on the reactant side is not balanced with the one at the product side. The bromine on the reactant side has 1 atom of bromine while at the product side, it has 2 atoms. Therefore, it is unbalanced.
For a chemical equation to be balanced, the number of atoms and molecules at the reactant side must be equal to the number of atoms and molecules at the product side. A single replacement reaction takes place whenever there is a replacement of one element by another element in a compound during a chemical reaction.
Which statement BEST is plains the function of the mitochondria in the cell?
A: The Mitochondria sort and Package proteins for use to in the cell or export
B: The Mitochondria transform energy from organic molecules into energy for the cell
C: The Mitochondria break down and absorb material taken in by the cell
D: The Mitochondria manufacture all the proteins required by the cell or exported by it
Answer:
B
Explanation:
The mitochondria is the power house of the cell, making sure it meets the cell's energy needs.
Answer:
B. The Mitochondria transform energy from organic molecules into energy for the cell
I hope this helps!
Name the following compound: RbI
RbI means Rubidium Iodide
ASAP. Which pair of elements will form an ionic bond.
1. carbon and oxygen
2.carbon and chlorine
3.nitrogen and oxygen
4.barium and chlorine
PLEASE HELP!!!!!!!
Many repeating, simple subunits are joined together. What is the most likely
O a halogen
O a polymer
O a monomer
an amino acid
Answer:
O a polymer
Explanation:
When many repeating simple subunits are joined together, this results into a polymer.
The simplest unit or smallest unit of any substance is called a monomer. When many units of a monomer joins together, a polymer results.
For proteins, the monomeric unit is amino-acid. When they combine they form longer chain molecules called proteins. For carbohydrates, the monomeric unit is called glucose. When they are combined they give us a wide range of carbohydrate molecules.Answer:
B: a polymer
Explanation:
Another structure that most cells have in common is a _____________________ in the center of the cell, which contains the blueprints for the cell's growth and reproduction.
Answer:
NUCLEUS
Explanation:
Firstly, the BLUEPRINT of life in living cells is the DNA, which stores the information that encodes the synthesis of products (proteins) that are needed by the cell for growth and reproduction. This DNA is located in a structure in eukaryotic cells called NUCLEUS.
The NUCLEUS is the organelle present in the center of eukaryotic cells, which which contains DNA, which is regarded as the blueprints for the cell's growth and reproduction. Note that, the most cells being referred to in this question are EUKARYOTIC CELLS as prokaryotic cells do not contain a NUCLEUS.
An astronomer is studying two stars that are the same distance from the earth. Star X appears brighter than Star Y. Which statement best explains this observation
Explanation:
The brightness of star depends upon two factors
1. Luminosity
2. Distance from the earth.
Luminosity is the amount of energy emitted by the star in unit, greater the luminosity greater will be the brightness. However, Stars that are closer to Earth, but fainter, could appear brighter than far more luminous ones that are far away.
Therefore, star can either be closer to earth or more luminous than star Y or both.
What are OBSERVABLE PROPERTIES
Answer:Observable properties are characteristics or things about materials or objects that we can describe using our five senses. Color, texture, hardness, and flexibility are all things we can determine with our senses.
Explanation:
this layer may reach temps. of of 9000 degrees F & pressures of 45 mill. lbs per square inch.
Answer:
Asthenosphere.
Explanation:
The layer of Asthenosphere of the earth has the temperature of 9000 degrees Fahrenheit and pressures of 45 mill. lbs per square inch. In this layer of earth, iron and nickel are present in the form of liquid due to very high temperature of the layer and also has a great influence on the earth's magnetic field. Asthenosphere refers to the region present at the upper mantle of Earth which highly viscous and ductile.
Which metal gets coated during electroplating? A. The metal with electrons flowing from it
B. The metal that is the cathode
C. The metal that is the anode
D. The metal with ions coming off it
Answer: The metal that is the cathode (B)
Explanation:
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how many molecules are 4.3 x 10^27 molecules of N2O5
Answer:
7142.86 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{4.3 \times {10}^{27} }{6.02 \times {10}^{23} } \\ = 7142.857...[/tex]
We have the final answer as
7142.86 molesHope this helps you
How does the electric force between two charged particles change if the
distance between them is decreased by a factor of 3?
A. It is increased by a factor of 3.
B. It is increased by a factor of 9.
O C. It is decreased by a factor of 3.
O D. It is decreased by a factor of 9.
When will single, double, or even triple bonds form in a compound?
Answer:
Double and triple covalent bonds are stronger than single covalent bonds ... Double and triple bonds offer added stability to compounds, and restrict any rotation around the bond axis.
Which of the following is NOT part of the Kinetic Molecular Theory of
gases?
1 poi
particles are in constant motion
particles move in a random way
particles are attracted to or repulsed by each other
O particles are separated by mostly empty space
Explanation: particles are not attracted or repulsed by each other because they are so far apart that the force of attraction or repulsion is highly negligible
What is one main difference between nuclear fission, nuclear fusion, and nuclear decay? A. Nuclear decay occurs spontaneously as a random event. B. Nuclear decay is initiated by adding a large amount of energy. C. Neutrons are only present in nuclear fission reactions. D. Smaller nuclei are produced following nuclear fusion.
Answer:
A.
Explanation:
I think, I hope it helps
Balance the equation. CaCl2 + K2(CO3)
Answer:
ca double 2
Explanation:
because chemistry is hard enough with all this
Pls help ASAP will give brianlist
Answer:
I'm not 100% sure but I believe it is the first or last
there should be three y's and one x but I can't remember the order. my gut goes with the top one
If the pressure on the surface of water in the liquid stato
is 47 kPa, the water will boil at
A) 0.0°C
B) 40°C
C) 80°C
D) 101.3°C
The water will boil at C) 80°C
Further explanationGiven
Vapour pressure of water = 47 kPa
Required
Boiling point of water
Solution
We can use the Clausius-Clapeyron equation :
[tex]\tt ln(\dfrac{P_1}{P_2})=\dfrac{-\Delta H_{vap}}{R}(\dfrac{1}{T_1}-\dfrac{1}{T_2})[/tex]
Vapour pressure of water at boiling point 100°C=101.325 kPa
ΔH vap for water at 100°C=40657 J/mol
R = 8.314 J/mol K
T₁=boiling point of water at 101.325 kPa = 100+273=373 K
Input given values :
[tex]\tt ln\dfrac{101.325}{47}=\dfrac{-40657}{8.314}(\dfrac{1}{373}-\dfrac{1}{T_2})\\\\0.7682=4890.1852(\dfrac{1}{373}-\dfrac{1}{T_2})\\\\0.0001571=(\dfrac{1}{373}-\dfrac{1}{T_2})\\\\\dfrac{1}{T_2}=0.00283\rightarrow T_2=353~K=80^oC[/tex]
