Answer:
a. Calcium
Explanation:
Strontium and Calcium are both in the same group, Group 2.
Answer:
Calcium and strontium are in the same group.
Group 2a of the perodic table are the alkaline earth metals
How much explosive ammo to get through a sheet metal door.
Answer:
Sheet Metal Door:63
Explanation:
An indicator is_____ Select all that apply.
an inorganic compound used to determine if a solution is acidic or basic
an organic compound that does use color.
an organic compound that is used to indicate whether a solution is an acid or a base
an organic compound that does NOT use color.
Answer: C
Explanation:
Indicators are organic weak acids or bases with complicated structures.
An indicator is an an organic compound that is used to indicate whether a solution is an acid or a base.
What is an indicator?
Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.Examples of indicators are phenolphthalein ,methyl red, EBT,eosin,etc.
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Which molecule contains bonds with a greater polarity.
What mass of zinc will completely react with 125.0 mL of a solution of nitric acid (HNO3) which has concentration of 0.850M?
The mass of zinc required to react with HNO3 is 3.45 g
What is moles of HNO3 reacting?The moles of HNO3 reacting is calculated using the formula below:
moles = concentration × volumevolume = 0.850
volume = 125.0 mL = 0.125 L
Moles of HNO3 = 0.850 × 0.125 = 0.10625 moles
Equation of reaction:
Zn + 2 HNO3 --> Zn(NO3)2 + H2
2 moles of HNO3 reacts with 1 mole of Zn.
moles of zinc reacting = 0.10625/2 = 0.053125
Mass of zinc = moles × molar mass
molar mass of Zn = 65
Mass of zinc = 0.053125 × 65
mass of Zn = 3.45 g
Therefore, the mass of zinc will completely react with 125.0 mL of a solution of nitric acid (HNO3) which has concentration of 0.850M is 3.45 g
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when 57.0 g copper are reacted with silver nitrate solution, 138g of silver are obtained. what is the percent yield of silver obtained
Answer:
86.96
Explanation:
For each of the following choose the variable that will be more favorable in solution formation. A) Weak or Strong Solvent intermolecular forces B) Weak or Strong Solute intermolecular forces C) Weak or Strong Solvent-Solute intermolecular force D) Increase or Decrease in Entropy E) Increase or Decrease in Enthalpy
Based on factors affecting solution formation;
Strong solvent-solute intermolecular forces favors solution formation.Increase in entropy favours solution formationDecrease in enthalpy favours solution formationWhat is a solution?A solution is a substance formed when a substance known as solute dissolves in another substance know as solvent.
Factors that affect solution formation include:
strength of intermolecular forces between solute and solvententropyenthalpyStrong solvent-solute intermolecular forces favors solution formation.
Increase in entropy favours solution formation
Decrease in enthalpy favours solution formation.
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What is the purpose of determining the formula mass of a compound?.
Section 1 - Question 2
You have set up a lab investigation to illustrate the stages of the water cycle. You are using a heat lamp with three different heat settings to represent the sun and the ener
Which stage of the water cycle is affected MOST by the highest setting on the heat lamp?
A
collection
B
condensation
С
evaporation
D
precipitation
have set up a lab investigation to illustrate the stages of the water cycle. You are using a heat lamp with three different heat settings to represent the sun and the ener
Which stage of the water cycle is affected MOST by the highest setting on the heat lamp?
A
collection
B
condensation
С
evaporation
D
precipitation
How does changing the initial temperature of the copper affect how much heat energy it has?
Answer:
the rock has a greater amount of heat energy which transfers to water causing vaporization.
What is 3.44555555 rounded to 3dp
Mrs. Vikram's science class notices that a high
pressure system bringing cold air is set to move
into their city. Currently, the weather is warm. As
the cold air enters their region, what will most
likely occur?
Storm clouds being formed will most likely occur in this scenario.
What are Storm clouds?These are formed during the process of convection in which heat and moisture is transported upward into the atmosphere.
We were told that the weather is warm and cold air will enter the region which means that it will replace the heat and moisture as they move upwards thereby resulting in the formation of storm clouds.
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Devise a 2‑step synthesis of 1‑(3‑nitrophenyl)propan‑1‑one from benzene.
Benzene is produced by the distillation of crude oil, being one of the by-products formed in this process, or even by synthesis, based on smaller hydrocarbons.
The 2‑step synthesis of 1‑(3‑nitrophenyl)propan‑1‑one from benzene.Reaction 1 - Electrophilic Addition of Halide (HX) to Alkenes
Reaction 2 - Radical addition of hydrogen bromide (HBr) to alkenes
Benzene is a compound compound as an aromatic hydrocarbon. It is widely used as a raw material in raw materials, in materials, in airlines and in petrochemical processes used for petrochemical raw materials side for petroleum.
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How does the life cycle of an average-sized star differ from the life cy-
cle of a high-mass star?
Stars with higher mass have much shorter life cycles because stars expand as they get older that is why the larger the star the older it is smaller stars are more dense with more energy
Would it be possible to completely remove all lead ions from a solution by precipitating them with chloride why or why not.
No. It will not be possible to precipitate all lead ions from a solution by precipitating them with chloride.
Precipitation reactionsWhen a chloride salt is used to precipitate lead ions from a solution, an insoluble lead chloride salt would be formed
Pb2+ + Cl- ---> PbCl2
However, the formation of PbCl2 in an aqueous medium leads to the establishment of equilibrium between dissolved ions and undissolved solids.
PbCl2 (aq) <------> Pb2+ + Cl-
Thus, it will not be possible to completely remove all the lead ions from the solution.
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Radiation on the _________________ is measured in wavelengths and frequencies.
Answer:
The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays
Explanation:
Answer:
Scale
Explanation:
You have a 0.200mol piece of aluminum. How many atoms are present in
the aluminum?
0.2 × 6.022 × 10²³ = 12.044 × 10²² = 1.2044 × 10²³
Name a compound that made from a covalent bond and name it’s use please!!!
What are the reasons to determine the melting point of a sample in a melting point apparatus?.
Answer:
The determination of a melting point of a sample is a standard laboratory procedure and is relatively straight forward. It is used to identify a sample, establish its purity and determine the thermal stability of the sample.
Compare and contrast the sense of smell and the sense of touch.
what are the factors affecting concentrations of solution
Answer:
Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...
Physical state of the reactants and surface area. ...
Temperature. ...
Presence of a catalyst.
Which element is a liquid at 305 K and 1.0 atmosphere?
And why
Answer:
Gallium is the correct answer. Gallium melts at a few degrees higher than room temperature, which is 298K.
A student reads the statement shown.
"The force of gravity exerted on an object decreases as the distance between the objects increases."
Using this statement, what inference can the student make regarding the movement of the planets around the Sun?
A. The orbital speeds of larger planets will be faster than smaller planets.
B. The orbital speeds of gaseous planets will be faster than rocky planets.
C. The orbital speeds of planets closer to the Sun will be faster than planets farther away.
D. The orbital speeds of planets with smoother surfaces will be faster than planets with rougher surfaces.
Answer: C. The orbital speeds of planets closer to the Sun will be faster than planets farther away.
Explanation:
Centripetal force = gravitational force
[tex]\tt m\dfrac{v^2}{r}=Fg[/tex]
[tex]\tt Fg=G\dfrac{M.m}{r^2}[/tex]
Fg inversely proportional to distances (r)
[tex]\tt v^2=\dfrac{Fg.r}{m}[/tex]
because the value of the gravitational force is getting smaller as the distance is getting further from the sun, the orbital speed of the planet will be getting smaller
Cation____ electrons causing the ion to have a ______ charge and anion ______ electrons to have a ________ charge
Answer:
are electrons causing the ion to have a positive charge and anions are electrons that have a negative charge
Explanation:
draw arrows to show the path of the electricity in this series circuit
pls answer quickly as possible
Explanation:
from positive to negative terminal
There will be a flow of current from the battery through the wires to the bulbs.
What is a circuit?The term circuit speaks of a path that is designed for the flow of current. We know that current often flows from the battery to other circuit components.
It then follows that in the circuit as shown, there will be a flow of current from the battery through the wires to the bulbs.
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What are the two entry points for electrons in the electron transport chain.
Answer:
How do electrons enter the electron transport chain?
All of the electrons that enter the transport chain come from NADH and FADH 2start subscript, 2, end subscript molecules produced during earlier stages of cellular respiration: glycolysis, pyruvate oxidation, and the citric acid cycle.
Explanation:
i hope it helped u :)
What kind of rocks might you expect to find on the Moon? Why do you think that?
Answer:
The Moon's surface is dominated by igneous rocks. The lunar highlands are formed of anorthosite, an igneous rock predominantly of calcium-rich plagioclase feldspar
Explanation:
Who is the editor in chief of The Washington Post?.
Considering the highly colored nature of the copper-containing reactant and product observed in part b, select an instrument that might have been useful in characterizing the equilibrium?.
The instrument that might be useful in characterising the equilibrium is spectrophotometer.
The use of spectrophotometerSpectrophotometer is an instrument that is used to determine the reflectance of solutions which is affected by the amount of photons absorbed by the solution.
In a solution where by both the reactant and the product contain highly coloured nature of copper, the spectrophotometer can be used to characterise the equilibrium of copper.
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Amy is looking for a model of the relationship between limiting factors and carrying capacity.
Which would be the best model?
A. a seesaw because when limiting factors go down, the carrying capacity goes up
B. two helium balloons because when limiting factors go up, the carrying capacity goes up
Answer:
a seesaw because when limiting factors go down, the carrying capacity goes up
Explanation:
A limiting factor is the scarcest resource that limits the growth of a population, so, when limiting factors go down, that growth is no longer limited.
how many particles of sodium sulfate will be produced when you use 4.523 x 10^26 particles of sodium hydroxide?
2NaOH + H2SO4 --> 2H2O + NA2SO4
*round to 4 sig figs please !
im thinking 266.25g round up to 266.3 i hope i got it right :)
