Answer:
Why has my town experienced record-breaking cold and snowfall if the climate is warming? Is there scientific consensus that people are causing today's climate change? Do natural variations in climate contribute to today's climate change?
Explanation:
Yan po ang answer tama po yan
What is the mass of 11.5 moles of lithium
Answer:
1 moles =6.9g
11.5moles= x
then we have x=79.35g
Which products are formed when propane (C3Hg) undergoes combustion?
O A. Water and carbon
OB. Water and carbon dioxide
OC. Hydrogen and carbon dioxide
OD. Water, carbon dioxide, and oxygen
Answer:
Water and carbon dioxide
Explanation:
The product of combustion for all hydrocarbons are carbon dioxide and water
S + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O
In the above equation, how many grams of water can be made when 19.5 moles of HNO3 are consumed?
Answer:
117 grams H₂O
Explanation:
To find the amount, you need to (1) convert from moles HNO₃ to moles H₂O (via mole-to-mole ratio from equation) and then (2) convert from moles H₂O to grams (via molar mass from periodic table). The final answer should have 3 sig figs according the the given value (19.5).
S + 6 HNO₃ --> H₂SO₄ + 6 NO₂ + 2 H₂O
Molar Mass (H₂O): 15.999 g/mol + 2(1.008 g/mol)
Molar Mass (H₂O): 18.015 g/mol
19.5 moles HNO₃ 2 moles H₂O 18.015 grams
-------------------------- x ---------------------- x ---------------------- = 117 grams H₂O
6 moles HNO₃ 1 mole H₂O
What is the name of the functional group that is attached to this hydrocarbon? a carbon atom is single bonded to o h to the right, and h below, left, and above. alkyl halide alcohol carbonyl ketone
The name of the functional group of the hydrocarbon that has a chemical formula of CH3OH is alcohol (OH). Details about alcohol can be found below.
What is a functional group?In chemistry, a functional group is a specific class of a group of compounds that determines the chemical properties of the group.
The hydrocarbon given in this question has the chemical formula of CH3OH is methanol. Methanol as the name implies has a functional group called alcohol.
Therefore, the name of the functional group of the hydrocarbon that has a chemical formula of CH3OH is alcohol (OH).
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(1) it takes 40 ml of a 0.25 m naoh solution to neutralize 100 ml of an hcl solution. what is the concentration of the hcl solution?
Answer:
0.1M
Explanation:
Using Neutralisation formula,
MaVa=MbVb
>>(0.25)(40)=Mb(100)
Mb=0.1M
Suppose a particular electron has only two allowed energy levels. How many different wavelength photons (spectral lines) would result from all electron 3 transitions between these levels
Energy levels are the fixed places from the nucleus to the electrons of the atoms. Three possible wavelength photons are possible from the transitional levels.
What are spectral lines?Spectral lines are the dark or light uniform spectrum caused by the surplus or insufficient photons in the atom. They absorb and emit light in a certain frequency range.
Photons are transmitted from one energy level to another level of lower energy, three transitions from levels 1 - 2, 1 - 3, and 2 - 3 are possible.
Therefore, 3 spectral lines are possible.
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Find the final temperature when 10 grams of aluminum at 130 c mixes with 200 grams of water at 25 c. assume no water is lost as water vapor. specific heat values (c) for aluminum= 0.901 j/g c and water 4.18 j/g c
Answer:
About 26.12 C°
Explanation:
Following q = mc∆t, assuming q is the same
(10g)(130 - T)(0.901j/g*c) = (200.0g)(T - 25)(4.18j/g*c)
T = 26.12
In an experiment, the same mass of magnesium metal reacted with the same amount of two different acids. the acid used in reaction 1 was ethanoic acid and in reaction 2 it was hydrochloric acid. which reaction produced the most gas?
The mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
What is the mole ratio of a reaction?The mole ratio of a reaction is the ratio in which the reactants and products of a given reaction occur for the reaction to proceed to completion.
The mole ratio of a reaction is also known as the stoichiometry of the reaction.
The equation of the two reactions are given below:
[tex]Mg + 2HCl \rightarrow MgCl_2 + H_2[/tex]
[tex]Mg + 2CH_3COOH \rightarrow (CH_3COO)_2Mg + H_2 \\ [/tex]
From the equation of the reaction reaction, an equal volume of hydrogen gas will be produced by the two reactions.
Therefore, the mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
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What is the half-life of an isotope if after 14 days you have 31.25 g remaining from a
250.0 g sample?
Answer:
4 2/3 days
Explanation:
31.25 = 250 ( 1/2)^n solve for n
31.25/250 = 1/2 ^n log both sides to find n = 3 half lives
14 days = 3 half lives
14/3 = 4 2/3 day half life
short paragraph about volcano and its features.
How do you think the light would travel if the laser pointer was 1000 meters away?
It is entirely dependent on the laser power (mW). The light's divergence is affected by it.
What exactly is a laser?A laser is a device that produces a powerful beam of coherent monochromatic light by stimulating the emission of photons from excited atoms or molecules.
A laser is generated when electrons in optical materials such as glass, crystal, or gas absorb energy from an electrical current or light.
We can see a 5mW 650 nm laser glowing on a white surface in full darkness from 500 to 1 kilometer away.
As a result of the divergence, the predicted dot 1 km away will be a massive dot with a diameter of 20–30 m30 m and will be exceedingly dark.
As a result, it is entirely dependent on the laser.
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Classify: Heat that is transferred in a circular motion with warm particles rising and cool
particles sinking in a gas and liquid is called____
Convection
Conduction
Radiation
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Which of the following reactions shows a chemical change producing a solid?
2CH₂OH()+30₂(g) → 200₂(g) + 4H₂O(1) 2AgNO3(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO3)2(aq) H₂(g) + O₂(g) → H₂O(l) NaCl(s) → NaCl(aq)
The chemical change producing a solid would be [tex]2AgNO_3(aq) + CaBr_2(aq) --- > 2AgBr(s) + Ca(NO_3)_2(aq)[/tex]
What are precipitation reactions?They are reactions involving two soluble salts with one of the products being an insoluble salt.
In the reaction below: [tex]2AgNO_3(aq) + CaBr_2(aq) --- > 2AgBr(s) + Ca(NO_3)_2(aq)[/tex]
[tex]AgNO_3[/tex] and [tex]CaBr_2[/tex] are soluble salts while [tex]AgBr[/tex] produced is an insoluble salt. The insoluble salt is a solid.
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Answer: 2AgNO3(aq)+CaBr2(aq)—>2AgBr(s)+Ca(NO3)2(aq)
Explanation:
just did on apex; 2AgNO3(aq)+CaBr2(aq)>2AgBr(s)+Ca(NO3)2(aq)
What are some differences between pure substances and mixtures?
Answer:
. a pure substance consists only of one element or one compound.
. a mixture consists of two or more different substances, not chemically joined together
What are some reasonable safety precautions for conducting field investigations
in polar climates?
Answer:
warm clothing hiking sticks safter gear. food water. the basics
ICE
OC
TINITIAL
37°C
MWATER
231g
Heat will flow from the warm water into the 0° C ice.
Energy will flow until all of the ice has become water
and has the same temperature as the original warm
water, Tfinal. The amount of energy the warm water lost
(which is equal to the amount of energy the ice gained
in order to melt) can be calculated by the equation we
learned last week.
MICE +
MWATER
2.65 4
-22.5°C
TFINAL
AELost = MWATER * SH WATER (TINITIAL -TFINAL)
Х
Once you make this calculation you will have the
amount of energy that is needed to melt your total
mass of ice, so just divide it by the mass of ice you
melted and you will have the heat of fusion of ice
(Hfus for H,O) in Joules per gram of ice. Remember to
repeat the experiment at least one more time using a
different amount of water, a different amount of ice, and
.
Answer:
Suppose that several objects composed of different materials are heated in the same manner. Will the objects warm up at equal rates? The answer: most likely not. Different materials would warm up at different rates because each material has its own specific heat capacity. The specific heat capacity refers to the amount of heat required to cause a unit of mass (say a gram or a kilogram) to change its temperature by 1°C. Specific heat capacities of various materials are often listed in textbooks. Standard metric units are Joules/kilogram/Kelvin (J/kg/K). More commonly used units are J/g/°C. Use the widget below to view specific heat capacities of various materials. Simply type in the name of a substance (aluminum, iron, copper, water, methanol, wood, etc.) and click on the Submit button; results will be displayed in a separate window.
Explanation:
What reactant concentrations, pressure and temperature conditions would favor the production of the substance that is underlined in each of the following equations. Make sure you address all three of the factors listed above for each equilibrium.
a) 2CO(g) + O2(g) <--> 2CO2 (g) + 167 kJ
b) Cu2+(aq) + 4NH3(aq) <--> Cu(NH3)42+(aq) + 42 kJ
c) 2HI(g) + 12.6 kJ <--> H2(g) + I2(g)
d) 4HCl(g) + O2(g) <--> 2H2O(g) + 2Cl2(g) + 113 kJ
e) PCl5(g) + 88 kJ <--> PCl3(g) + Cl2(g)
Answer:
a) Increase the pressure, Increase the reactants, Decrease the temperature
b) No effect on pressure, Increase the reactants, Decrease the temperature
c) No effect on pressure, Increase the reactants, Increase the temperature
d) No effect on pressure, Increase the reactants, Decrease the temperature
e) Decrease the pressure, Increase the reactants, Increase the temperature
I had to look up the questions online because you did not underline them properly, but yeah these should be the respective conditions for each equation
Increasing pressure shifts equilibrium to the side with the least amount of gas moles, decreasing pressure does the opposite
Increasing Reactants will cause more products to be made
Increasing temperature in an endothermic reaction will shift equilibrium to the right, and in the opposite direction if the reaction is exothermic (left)
Decreasing temperature in an endothermic reaction will shift equilibrium to the left, and in the opposite direction if the reaction is exothermic (right)
What is a chemical equation? What does it tell you?
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulas.
3. related to the amount of energy a wave carries and is
measured from the top or bottom of the wave to the middle
a. frequency
b. wavelength
c. amplitude
Answer:
c
Explanation:
because is the measurement of amplitude
If I have 340 mL of a 1.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?
Answer:
0.5667 M ≅ 0.57 M.
Explanation:
It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.
It can be expressed as:
(MV) before dilution = (MV) after dilution.
M before dilution = 1.5 M, V before dilution = 340 mL.
M after dilution = ??? M, V after dilution = 340 mL + 560 mL = 900 mL.
∴ M after dilution = (MV) before dilution/(V) after dilution = (1.5 M)(340 mL)/(900 mL) = 0.5667 M ≅ 0.57 M.
The diagram shows that the potential energy of the products is lower
than the potential energy of the reactants. Which type of reaction is
shown?
(Once it hits the top of the hill it says activation energy
Once it hits the bottom to the word products it says heat of reaction)
A: this is an exothermic reaction because the reactants have less energy than the products
B: this is an endothermic reaction because the reactants have more energy than the products
C: this is an endothermic reaction because the reactants have less energy than the products
D: this is an exothermic reaction because the reactants have more energy than the products
Answer: D
Explanation:
If 321.5 grams of phosphorus chloride are made, how many grams of phosphorus were consumed?
If 321.5 grams of phosphorus chloride are made, then 168.235 grams of phosphorus were consumed.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of phosphorous chloride = 321.5g / 74.55g/mol = 4.315 mole
Given chemical reaction is:
2K + Cl₂ → 2KCl
From the stoichiometry of the reaction:
2 moles of KCl = produced by 2 moles of K
4.315 moles of KCl = produced by 4.315 moles of K
Mass of potassium = (4.315mol)(39g/mol) = 168.235 g
Hence required mass of phosphorous is 168.235 g.
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find the iupac name for this question
Answer:
3 - Methylpent-2-yn-1-ol
One form of energy can transform into another form of energy.
17 Energy in a flashlight's battery changes from ________ energy to electrical energy.
Answer:
Chemical
Explanation:
Chemical energy is stored in the batteries of a flash light. When the flashlight is used, the Chemical energy that was stored, is then used to make Electrical energy for the flashlight. Then electrical energy is converted to heat in the filament of the flashlight bulb. Some of the heat is lost to the surroundings, and some is converted into light energy.
Mechanism of cell destruction of Poison oak
Short Essay!
Explain how scientists have used the concept of metallic bonding to account for many of the physical properties of metalssuch as electrical conductivity and malleability .
PLS HELP!!
Answer:
Explanation:
Because electrons are delocalized around positively charged nuclei, metallic bonding explains many properties of metals. Electrical conductivity: Most metals are excellent electrical conductors because the electrons in the electron sea are free to move and carry charge.
What is the "modern" definition of atomic theory?
Answer: The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. Each element has its own characteristic atomic number. Atoms of the same element can have different numbers of neutrons, however.
Explanation: N/A
Why do some cells make food molecules?
Answer:
All living cells release energy from food molecules through cellular breathing and/or fermentation. Some cells make food molecules using light energy through the process of (making food from light).
Making food from light- Photosynthesis
Breathing- Respiration
All living units give out power for a given time from food small complex units through formed of small units breathing and or fermentation. Some units make food small complex units using light power for a given time through the process of (making food from light).
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What is the frequency of a wave that has a wavelength of 28m? Remember that c = 2.998 x 10^8 m/s
A.) 10 Hz
B.) 1.07 x 10^7 Hz
C.) 10.7 Hz
D.) 2.3 x 10^7 Hz
Answer:
Frequency = Speed/wavelength
Frequency = 2.998 x 10^8 m/s ÷ 28m
Frequency = 1.07 x 10^7 Hz
Which of these statements is false? The least reactive elements are in the far right column. Elements at the bottom of a column have more protons than elements at the top of a column. Elements on the left side of a row always have higher atomic mass than elements on the right side of that row. Elements along the steplike line have some properties of metals and some properties of nonmetals.
Answer:
Elements on the left side of a row always have higher atomic mass than elements on the right side of that row.
Explanation:
the answer I have above should be correct because it’s false so it’s the right answer.