Answer:
1+
Explanation:
Sodium has one valence electron. When it bonds with a nonmetal like sulfur, it gives up that electron to become a positively charged ion (cation) with a charge of 1+.
There are three factors in which natural selection occurs. Select one statement from the list below that is a true statement about natural selection.
Answer: There is no list in your question. But the three factors in which natural selection occurs are:
1. A struggle for existence,
2. Variation and
3. Inheritance
Explanation:
Darwin’s theory of natural selection is the way in which organisms change overtime.
These changes allow organisms to become better adapted to their environment and increase their chances for survival.
The three major factors through which natural selection occurs are:
1. A struggle for existence,
2. Variation and
3. Inheritance
Darwin’s theory of natural selection will occur if the three conditions above are met and unless these factors are in place, natural selection will not occur.
50g of potassium chloride is dissolved in 500 cm3 of water. Calculate the concentration of the solution. Give your answer in g/dm3
Generally, when food is cooked:
choose all that apply
The food absorbs energy.
An exothermic reaction takes place in the food.
An endothermic reaction takes place in the food.
Answer:
An exothermic reaction takes place in the food
electrons are transferred in forms of what
Answer:
ionic bonds
Explanation:
bromine water can be used to distinguish between these two molecules?? true or false
Answer:i dkd
Explanation:
jsach
Which statement is about weather and not climate?
A. The high temperature yesterday in Dallas was 24°C.
B. Dallas has hot summers and generally mild winters.
C. The coolest month of the year in Dallas is usually January.
D. In Dallas, it often reaches 40°C in the summer.
Answer:
B
Explanation:
I hope that's right I think it is though
What three sedimentary rocks form from chemical precipitates and evaporites?
Answer: Rocks formed in this way include halite, gypsum, anhydrite, and some limestones. Layers of precipitated rocks are called evaporite deposits because they typically form where evaporation is high in arid regions like the desert southwest and in the eastern Mediterranean.
Explanation:
The three sedimentary rocks form from chemical precipitates and evaporites are halite, gypsum and anhydrite.
What are sedimentary rocks?Pre-existing rocks or bits of once-living animals constitute sedimentary rocks. They are formed by the accumulation of sediments on the Earth's surface.
Halite, gypsum, anhydrite, and various limestones are examples of such rocks. Evaporite deposits are layers of precipitated rocks that occur in arid locations like the desert southwest and the eastern Mediterranean where evaporation is considerable.
Hence three sedimentary rocks are Halite, gypsum and anhydrite.
To know more about sedimentary rocks, visit the below link:
https://brainly.com/question/195844
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PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!! THIS IS DUE IN 10 MINUTES!!!!!
Forensic chemists are analyzing blood samples taken from a murder victim. They run tests for any trace of substances that do not naturally occur in the bloodstream. Nothing odd registers but they do find extremely high levels of caffeine. What does this most likely indicate about the murder victim?
A) They drank a lot of coffee.
B) They worked on a coffee bean plantation.
C) They were poisoned with powdered caffeine.
D) Someone put arsenic in their coffee.
Answer:
c
Explanation:
Answer:they were poisoned with powdered caffeine (C)
Explanation:
I just took the test! And got all the points for this question :) hoped I could help
give an example of how an organism can use surface tension?
Answer: Examples of surface tension
Explanation:
Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water. Water striders use this surface tension to their advantage through their highly adapted legs and distributed weight.
What number is pointing to the area where magma is less dense due to
heat?
Answer:
I think it's 2
Explanation:
The magma gets so hot, it floats up before cooling and sinking again
Which of the following setups will correctly convert 36.45 grams of sodium to moles of sodium?
Answer:
D.
Explanation:
To convert from grams of a substance to moles of a substance, you use molar mass as a conversion factor. Sodium's molar mass is 22.99 grams per mole. To cancel out grams, you need to place grams on the bottom and moles on the top.
which of the following represents the atoms of 2 different elements?
Answer:
B
Explanation:
Mm 2mCOO 19. Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x (3 points) 10-11 mol/L. Is this solution acididc, basic, or neutral? Show your work.
Answer: The hydrogen-ion concentration for the aqueous solution is [tex]10^{-3}mol/L[/tex] and solution is acidic.
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxyl ion concentration.
[tex]pOH=-\log [OH^-][/tex]
Putting in the values:
[tex]pOH=-\log[1\times 10^{-11}][/tex]
[tex]pOH=11[/tex]
[tex]pH+pOH=14[/tex]
\[tex]pH=14-11=3[/tex]
[tex]pH=-log[H^+][/tex]
[tex]3=-log[H^+][/tex]
[tex][H^+]=10^{-3}M[/tex]
As pH is less than 7, the solution is acidic.
1 pts
Which of the following gases would you predict to be least ideal?
Cu
Explanation:
The gas that would behave least ideally is CO
Eye Color
Genetic
O Environmental
O Both
Answer:
the first cause eye color is genetic
When converting from grams to the must be used as a conversion factor
If the sun output of solar radiation increased by 20% how would this impact the temperature of earth's mantle
Answer:
The temperature will not be affected directly
Explanation:
The solar radiation has a direct effect on the outer surface and inner part of the earth but an increase by 20% of the solar radiation will not cause the temperature of the Earth's mantle to increase because the factors that heat up the Earth's mantle are : Friction between core materials that sink into the center of the planet and Heat from decay of radioactive materials
What is the molarity of a solution containing 12.0 g of NaOH in 250.0 mL of solution?
Answer:
1.196 M NaOH
Explanation:
Molarity = moles/Volume (L)
moles NaOH = mass NaOH/MM NaOH = 12/40.01 = 0.299 moles NaOH
Volume solution = 250 mL = 0.250L
M = 0.299/0.250=1.196 M NaOH
during the ___________ (anaphase, metaphase) step of mitosis, the centromere of each pair of chromatids becomes attached to two spindle fibers
True or false: chewing your food is the first step of digestion. o True O False
Answer:
True
Explanation:
I searched it up lol
how many valence electrons does C6H14O6 have?
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How can we prepare a weak acid from
carbondioxide ? Write with chemical equation
SAP
Answer:
H2O+CO2--------> H2CO3
Answer:
Carbonic acid- H2CO3
Explanation:
Water+co2 gives H2CO3
H2CO3 is an acid, which Carbonic acid that is H2CO3 is a weak acid
It decomposes into CO2 and H2O
A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon ?
Answer:
A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon? A It would cause the wagon to move faster.
Explanation:
Hoped this helped you guys!
It is more logical to believe that the complex life sustaining processes of the sun-Earth system were created because they Choose... on one another.
A. rely
B. orbit
C. breathe
D. spin
I need help ASAP please
Calculating pH
See chart below
Answer:
12, basic, 9, basic
Explanation:
pH = -log[H+]
Using the data in the table, you can calculate the pH:
-log[1e-12] = 12
-log[1e-9] = 9
To find out whether it is acidic, basic, or neutral, use a pH scale. Anything less than 7 is acidic, anything over is basic. Knowing this, both will be basic.
Just help please
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2) Why do some earthquakes cause more damage than others?
Answer:
Earthquakes are more intense the faster the planet's crust slams together, which explains why the shaking causes so much damage in some of the most populated areas around mountain chains. ... One reason for this connection is that when two plates come together quickly, the area over which an earthquake occurs is larger.Explanation:
How many grams of AgCl are produced from 10.0 g AgNO3?
Answer:
Equation of Reaction = AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq)
Steps:
1. Find the moles of AgNO3 with formula n= Mass/Mr (molecular mass)
so you will get moles= 10.0/ 169.87 = 0.05886854654
2. Using stoichiometry you know the equation has 1 mole so the moles of AgCl are gonna be the same; therefore, you will use again the same formula.
3. moles= mass/molecular mass
0.05886854654 = x/ 143.32
You rearrange the formula to find the mass
so mass = moles x molecular mass
mass = 0.05886854654 x 143.32
mass= 8.44 grams
Explanation:
pls help, what is this compound called?
Answer:
Ammonium
Explanation:
ammonium is a compound because it has 2 elements
A water solution containing an unknown quantity of a
nonelectrolyte solute is found to have a freezing point of
–0.23°C. What is the molal concentration of the solution?
Answer:
The molal concentration of the solution is approximately 0.124 molal
Explanation:
The given parameters are;
The reduced freezing point of the water = -0.23°C
For freezing point depression of a solution, we have;
[tex]\Delta T_f[/tex] = [tex]K_f[/tex]· b·i
Where;
[tex]\Delta T_f[/tex] = The freezing point depression
[tex]K_f[/tex] = Cyroscopic constant (The freezing-point depression constant) = 1.86° Cm⁻¹ for water
b = The molality of the solution
i = van't Hoff factor = 1
Therefore;
[tex]\Delta T_f[/tex] = [tex]T^{\circ}_f - T_f[/tex]
Where;
[tex]T^{\circ}_f[/tex] = The freezing point of pure water = 0°C
[tex]T_f[/tex] = The freezing point of the solution = -0.23°C
∴ [tex]\Delta T_f[/tex] = [tex]T^{\circ}_f - T_f[/tex] = 0°C - (-0.23°C) = 0.23 °C
From, [tex]\Delta T_f[/tex] = [tex]K_f[/tex]· b·i, we have;
0.23°C = 1.86°C/m × b × 1
∴ b = (0.23°C/1.86°C/m) ≈ 0.124 molal
Therefore, the molal concentration of the solution, b ≈ 0.124 molal.