Answer:
[OH-] = 2 x 10^-6 M
Explanation:
Calculate pOH first: 14 - pH = pOH --> pH = 14 - 8.3 = 5.7
[OH-] = 10^-pOH = 10^-5.7 = 2 x 10^-6 M
Only one sig fig in the concentration, because the pH only had one decimal place.
Plants are able to grow toward the light due to the process known as phototropism. This process takes place inside the plant. Is i Behavioral,structural,or Physiological
Answer:
Physiological
Explanation:
The process whereby plants respond and grow towards light is a physiological process.
Physiological processes are life-sustaining processes that require the combined efforts of cells, tissues, organs, and or systems along with that of biomolecules in the body.
The response of plants to light requires the efforts of a hormone that triggers the rapid mitotic division of cells of tissues/organs that are directly opposite the light source. Thus, the faster rate of division of these cells as compared to the cells of tissues/organs that are directly in contact with light leads to the plant's tissues/organs bending towards the light.
Oday, you will observe drops of liquid water and compare them to drops of liquid isopropanol, noting whether either liquid evaporates. Given that the energy transferred in from the air will be the same for both liquids, make a prediction about whether both drops or only one drop will evaporate within five minutes. Explain your prediction below.
Answer:
Liquid isopropanol.
Explanation:
Liquid isopropanol will evaporate earlier than water because the boiling point of isopropanol is less than water. That liquid which have high boiling point require more heat energy for change into vapor state as compared to those liquids that has low boiling point. The isopropanol has boiling point i.e. 82.5 °C while on the other hand, water has boiling point i.e. 100 °C so we can say that isopropanol will evaporate first.
The liquid that will be the first to evaporate within 5 minutes is; Liquid Isopropanol
We have the 2 liquids as;
Liquid Isopropanol
Liquid water
Now, since we are dealing with the one that will evaporate within five minutes, we need to know their boiling points.
From online research;
Boiling point of liquid isopropanol is 82.5°C
Boiling point of liquid water is 100°C
Now, we are told that the same energy is transferred for both liquids. However, boiling point of the liquid with the lower boiling point will be achieved first and as a result will evaporate first since the next stage after boiling point is evaporation of steam.
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The atom has 2 different types of subatomic particles.
True or False
Answer:
False
Explanation:
There is three
At a certain grocery store a 0.500 pound container of ground cinnamon cost $6.98 (excluding tax). Cinnamon has a density of 0.560 g/Ml. How much would 500.0 mL of cinnamon cost?
Answer:
The cinnamon cost would be "$8.62". A further explanation is given below.
Explanation:
Cinnamon's density,
= 0.560 g/ml
On converting it into g, we get
= [tex]0.560\times 500[/tex]
= [tex]280 \ g[/tex]
Cinnamon's volume,
= 500 ml
As we know,
1 pound = 435.592 g
Now,
The cost pf cinnamon per pound will be:
= [tex]\frac{6.98}{0.5 \ pound}[/tex]
= [tex]13.96[/tex] ($) per pound
So,
Cinnamon's cost will be:
= [tex]250 \ g\times \frac{1 \ pound}{435.592 \ g}\times \frac{13.96}{1 \ pound}[/tex]
= [tex]8.62[/tex] ($)
The last question i need help on and can you explain please? On D
Answer:
speed
Explanation:
Acceleration means an increase in the rate or speed of something.
Answer:
d) 25 m/s²
Explanation:
[tex]\boxed{F = ma}[/tex]
where F= force (N), m= mass (kg), a= acceleration (m/s²)
Net force
= 125 -75
= 50 N
(This is found in part a)
Given that the mass is 2kg, m=2.
F= ma
50= 2a
a= 50 ÷2
a= 25 m/s²
500.0 mL of a gas is collected at 745.0 mmHg. What will the
volume be at 760 mmHg?
Answer:
490 ml
Explanation:
When the equation H2 + Fe3O4 = Fe + H2O is completely balanced using the smallest whole numbers, the coefficient oH2 would be A.) 1 B.)2 C.) 3 D.) 4
Answer:
H2 would have a coefficient of 2.
Explanation:
According to the balanced chemical equation, the coefficient of hydrogen is 4.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?
a. 0.23 mL
b. 4.34 mL
c. 479 mL
can someone help me with this? thanks
Answer:
1 mole of lithium is 7 grams. we know this from it's relative molecular mass.
if 1 mole is 7 grams then x moles is 0.56 grams
we can equate them by saying (1/x)=(7/0.56)
after cross multiplying, we get 7x=0.56, x will be equals to 0.56/7
x=0.08 grams
0.08 mole is your answer
Answer:
we have
1 mole of li =7g
now
5.6×10^-1g of li =1mole/7g×5.6×10^-1 g=0.08mole
[20 Points!] The solubility product constant of calcium hydroxide is 6.5 x 10^-6. If 0.10 mol of sodium hydroxide is added to 1 L of 0.0010M Ca(OH)2, what is the final concentration of the calcium ion? Show your work.
Which of the following is NOT an example of circular motion?
(A) car turning a corner
(B) car accelerating onto highway
(C) yo-yo on a string going in a circle
(D) the Moon’s path around Earth
Answer:
B
Explanation:
A body moving with a constant speed and constantly changing direction and changing velocity is said to be in circular motion.
List as many things as you can see in the picture below
Abiotic (Non-Living)___________Biotic (Living)
__________________ ................ ___________________ __________________ ................ ___________________
___________________ ___________________
Calculate the number of Oxygen atoms in Imole of 02
Answer:
two oxygen atoms
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
Explanation:
A sample of carbon dioxide gas (CO2) contains 8.551 x 1025 molecules. How many moles of carbon dioxide does this represent?
Answer:
142.0 moles CO₂
Explanation:
To answer this question, we first need to know what a mole is. A mole represents [tex]6.022 \cdot 10^{23}[/tex] of something, and in this case, that something is molecules.
So, to convert [tex]8.551 \cdot 10^{25}[/tex] molecules into moles, we need to use the conversion factor [tex]1=\frac{6.022\cdot 10^{23} \text{molecules} }{ \text{1 mole}}[/tex].
Doing so (using dimensional analysis) gives us:
[tex]8.551 \cdot 10^{25} \text{ molecules } \cdot \frac{\text{1 mole}}{ 6.022\cdot 10^{23} \text{ molecules} } = \frac{8.551 \cdot 10^{25}}{ 6.022\cdot 10^{23}} \text{ moles CO}_2 = \\ \\ 141.996 \text{ moles CO}_2 = \boxed{142.0 \text{ moles CO}_2 }[/tex]
25 grams of methane (CH4) is placed inside a constant volume colorimeter. After the fuel is burned, the temperature rises by 45 degrees Celsius. If the heat capacity of the calorimeter is 5.57 kJ/C, what is the heat released?
An s w e r:
Explanation:
An organism's _______ describes its genetic composition. An organism's _______ describes its appearance or observable characteristics.
a) phenotype; genotype
b)heredity; species
c)species; heredity
d) genotype; phenotype
What happened during the fusion reaction shown?
Answer:
the answer to this question B. Two H nuclei that fused into one He necleus
Explanation:
Two hydrogen atoms fused to one helium molecule, hence option B is correct.
What is fusion?Fusion is defined as a process in which two or more atomic nuclei unite to create new atomic and subatomic particles. Heat, which is produced when two atoms fuse, is the key to generating energy. Similar to how nuclear fission produces energy, this heat can be utilized to warm water, produce steam, and turn turbines to produce electricity.
In the core of the Sun, hydrogen is being converted to helium. This phenomenon is known as nuclear fusion. Fusion is what powers both the sun and the stars. One example of this kind of reaction is when two hydrogen atoms combine to form a helium atom. During the process, a portion of the hydrogen's mass is converted into energy.
Thus, two hydrogen atoms fused to one helium molecule, hence option B is correct.
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Which of the following aqueous solutions would boil at the highest temperature?
A) 100 g of NaCl in 125 g of water
B) 100 g of NaCl in 250 g of water
C) 100 g of NaCl in 500 g of water
D) 100 g of NaCl in 1000 g of water
Need help with this (Chemistry)
Answer:
State is shown inside the parenthesis.
s is for solid
aq is for aqueous solutions
l for liquid
Scientists use___to grow new plants from cuttings of other plants.
{your options}
Cytokinis
Gibberellins
Auxins
Answer:
Cytokinesis
Explanation:
The scientists use the method of cytokinesis to grow new plants, and they represent a method of plant growth substance and that promotes the division of cells through the cutting of plant roots and stem. They involve in cell growth and differentiation. This method leads to cell growth man farmers use it for increasing their crop yields. As an application of this method to cotton plants can lead to a 5 to 10% increase during the drought conditions.How much heat must absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s)?
Answer:
about 4.8kJ
Explanation:
There is some missing information in the question given.
For use to determine the amount of heat that must be reacted in the system to convert 100g of NaNO₃ into NaHSO₄(s);
Then, we need to consider the following reaction between sodium nitrate (NaNO₃) and sulfuric acid (H₂SO₄):
[tex]\mathbf{NaNO_{3(s)}+ H_2SO_{4(l)}\to NaHSO_{4(s)}+HNO_{3(g)} \ \ \ \ \ \Delta H = 21.2 \ kJ}[/tex]
From the above reaction, 84.99 gm of NaNO₃ reacted with H₂SO₄ which is converted into NaHSO₄ thereby absorbing 21.2 kJ amount of heat.
This implies that; if 84.99 gm of NaNO₃ absorbs 21.2 kJ amount of heat.
1 gm of NaNO₃ will absorb = [tex]\mathsf{\dfrac{21.2}{84.99} \ kJ \ heat}[/tex]
= 0.2494 kJ amount of heat.
∴
100 g of NaNO₃ will absorb [tex]= \mathsf{\dfrac{21.2}{84.99} \times 100 \ kJ \ heat}[/tex]
= 24.94 kJ amount of heat.
Therefore, we can conclude that the amount of heat that must be absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s) is 24.94 kJ.
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What is the pH of 0.12M HNO3
Answer:
pH= 0.92
Explanation:
HNO3-> H^+ +NO3^-
HNO3 is a strong acid, so it fully dissociates
[HNO3] = 0.12M [H^+] = 0.12M
pH= -log[H^+]
pH=-log[.12] = 0.92
pH = 0.92
Suppose you have 6 miles of ethanol(C2H6O)to combust.How many moles of oxygen will the combustion use?
Answer: 18 moles of oxygen will be used.
Explanation:
Combustion is a chemical reaction in which a hydrocarbon is oxidized in the presence of oxygen to give carbon dioxide and water.
The balanced chemical reaction for combustion of ethanol is:
[tex]C_2H_6O+3O_2\rightarrow 2CO_2+3H_2O[/tex]
According to stoichiometry :
1 mole of ethanol require = 3 moles of [tex]O_2[/tex]
Thus 6 moles of ethanol will require=[tex]\frac{3}{1}\times 6=18moles[/tex] of [tex]O_2[/tex]
Thus 18 moles of oxygen will be used.
The satellite photograph shows an area in Alaska after a fire occurred. Which statement best describes the most likely effect the fire had on the river in the 12 months after it occurred
Answer:
bad stuff such as ashes and chemicals in the air from that fire could bring bad stuff to the water
Explanation:
This satellite image depicts an area in Alaska after a fire. Because the fire disrupted animal habitats and caused animals to flee, more sediment entered the river.
What is satellite ?A satellite, also known as an artificial satellite, is an object that is purposefully placed in orbit in outer space. Satellites are used for a variety of purposes such as communication relay, weather forecasting, navigation, broadcasting, scientific research, and Earth observation.
A satellite is any object that orbits another object, such as the Earth orbiting the sun. Hundreds of satellites are in operation. They serve a variety of functions, including weather forecasting, television signal transmission, amateur radio and internet communications, and the Global Positioning System.
GEO (Geostationary Earth Orbit) at approximately 36,000 kilometers above the earth's surface. LEO (Low Earth Orbit) is 500–1500 kilometers above the earth's surface. MEO (Medium Earth Orbit) or ICO (Intermediate Circular Orbit) at approximately 6000-20,000 kilometers above the earth's surface.
Thus, This satellite image depicts an area in Alaska after a fire.
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Which of the following would cause entropy to decrease?
A. CO2(g) → C02()
B. CO2(s) + CO2()
C. CO2() + CO2(9)
D. CO2(s) → C02(9)
The change that would cause entropy to decrease is CO2 gas changing to solid:
CO2(g) → C02(s)What is entropy?Entropy refers to the degree of randomness of a substance.
The higher the degree of randomness the higher the entropy value of that substance.
Entropy increases with increase in temperature as particles of substances gain more kinetic energy.
However, lowering temperature decreases entropy values.
The change from gas to liquid or solid involves lowering of temperature.
Therefore, the change that would cause entropy to decrease is CO2 gas changing to solid.
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WILL GIVE BRANLIEST
1)how many liters of HCl are produced when 47.2 L of chlorine are reacted with excess hydrogen at STP
2)if you need to make 24.0 g LiOH , how many grams of Li3N must you react with excess water?
3)How many moles of hydrogen gas can be produced from 13.2 moles of hydrochloric acid (HCl)
4)if 34.9g of copper (ll) chloride reacts with 42.1g of sodium nitrate what is the limiting reactant?
PLEASE HELP!
1) What type of reaction is this?
CaCO3 --------> CaO + CO2
2) Balance the equation (Hint, you need to balance the left side with the right side)
1) Decomposition
2) CaCO3 → CaO + CO2
equation is already balanced
A student is shown a simple model of particles that make up a liquid, as shown.How should the model be changed to show the particles of a liquid at a higher temperature?
Answer:
Change occur due to change in the state.
Explanation:
The model must be changed from the previous one because the liquid is exposed to high temperature which change the liquid into gaseous state. Due to change in the state from liquid into gas, the particles are present at more distance from each other because the gas molecules has more distance due to weak intermolecular forces so we can say that change must occur in the model.
Can someone help me? It needs to have a diagram that has arrows.
Answer: The enthalpy change for formation of butane is -125 kJ/mol
Explanation:
The balanced chemical reaction is,
[tex]C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(l)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}][/tex]
Putting the values we get :
[tex]\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}][/tex]
[tex]-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0][/tex]
[tex]H_f_{C_4H_{10}=-125kJ/mol[/tex]
Thus enthalpy change for formation of butane is -125 kJ/mol
When frictional forces do work on an object or mechanical system, what form of energy is always produced?
