Answers
Answer:
Global Warming
Explanation:
The biggest concern for environmental scientists is Global Warming. Our Earth is getting warmer which is having drastic effects on our planet. Such effects include increased natural fires, decreased water supply, decreased farm yields, increased floodings, etc. Global Warming poses a huge threat to humanity and it is because of humanity's constant and ever growing usage of fossil fuels that Global Warming is becoming such a threat. This is what environmental scientists are mainly focused on.
Related Questions
Propane gas plus oxygen gas produces
Answers
Answer:
Explanation:
As a result, the reaction of propane (C H) 3 8 and oxygen should produce carbon dioxide, water, and heat as products, and the balanced chemical equation will be: C H3 8 + 5O2 3CO2 + 4H O2 + heat. Reactants have the next highest potential power level when compared to materials.
Answer:
water and carbon dioxide
Explanation:
Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.
I hope this helps!
in which beakers are the particles moving the most slowly
Answers
In which of the following, are all the elements non-metals?
A. Na, Mg, O, N
B. C, Si, Ge, As
C. Fe, Ni, Cr, O
D. He, Ne, Ar, Kr
E. Ca, Ba, Sr, S
Answers
Answer:
The answer is D
Explanation:
Non metals are:
Hydrogen (H)
Sulphur (S)
Phosphorus (P)
Carbon (C)
Fluorine (F)
Oxygen (O)
Nitrogen (N)
Chlorine (Cl)
Bromine (Br)
Helium (He)
Argon (Ar)
Iodine (I)
Neon (Ne)
Krypton (Kr)
Radon (Rn)
Selenium (Se)
Xenon (Xe)
Is anyone good at chemistry if so can someone please help me NO LINKS PLEASE
Answers
Answer:
I think it's (a) all of the materials will reach the same temperature and heat flow will stop.
Suppose you heat a metal object with a mass of 34.5 g to 95.5 °C and transfer it to a calorimeter containing 100.0 g of water at 17.5 °C. The water and metal reach a final temperature of 24.9 °C.
Metal in a covered cup with a thermometer and heat indicated as leaving the metal.
What is the specific heat of the metal in J/g⋅∘C
Answers
q = m × c × ΔT
where q is the heat transferred, m is the mass of the metal, c is the specific heat of the metal, and ΔT is the change in temperature.
First, we need to calculate the heat transferred from the metal to the water:
q = m × c × ΔT
q = (34.5 g) × c × (95.5 °C - 24.9 °C)
q = 224,085 J
Next, we can calculate the heat absorbed by the water:
q = m × c × ΔT
q = (100.0 g) × (4.184 J/g⋅∘C) × (24.9 °C - 17.5 °C)
q = 3,073 J
Since the heat transferred from the metal to the water is equal to the heat absorbed by the water, we can set the two equations equal to each other and solve for c:
m × c × ΔT = m × c × ΔT
(34.5 g) × c × (95.5 °C - 24.9 °C) = (100.0 g) × (4.184 J/g⋅∘C) × (24.9 °C - 17.5 °C)
c = 0.385 J/g⋅∘C
Therefore, the specific heat of the metal is 0.385 J/g⋅∘C.
Can someone helppp please I will mark u brilliant
Answers
Answer:
all of the above
Explanation:
How does condensation occur?
Water vapor rises from Earth's surface into the sky.
Water vapor cools and forms water droplets in clouds.
Water droplets fall to the ground from the sky.
Water runs across Earth's surface.
Answers
Most of the export products of Papua New Guinea are from extractive industries which are non-renewable. What steps has the government initiated so that revenue will not be diminished after all the natural resources have been exploited ?
Answers
Managing a Precarious Recovery examines significant recent economic changes in PNG and places them in a longer-term, global context.
Economic Update for Papua New Guinea: Managing a Precarious Recovery examines significant recent economic changes in PNG and places them in a longer-term, global context. According to the research, the economy recovered to an increase of 1% in 2021 after shrinking by 3.5% in 2020.
The Porgera gold mine's anticipated reopening is anticipated to be the primary driver of the extractive sector's four percent contribution to GDP growth in 2022. The analysis does predict that increased global uncertainty will have an influence on PNG's overall medium-term growth.
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A solution of KC2H3O2 is diluted from its original concentration of 2.3 M to a new concentration 2.1 M. If it’s new volume is 191.8 mL, what was the original volume of the concentration solution?
Answers
The original volume of the concentrated solution was 182.7 mL.
To solve this problem, we can use the formula for dilution:
C1V1 = C2V2
Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.
We are given that the initial concentration (C1) is 2.3 M, the final concentration (C2) is 2.1 M, and the final volume (V2) is 191.8 mL. We want to find the initial volume (V1).
Plugging in the values we know into the dilution formula, we get:
(2.3 M) V1 = (2.1 M) (191.8 mL)
Simplifying this expression, we can solve for V1:
V1 = (2.1 M) (191.8 mL) / (2.3 M)
V1 = 182.7 mL
It's important to note that the units of concentration and volume must be consistent in this formula. In this case, the concentrations are given in units of M (moles per liter), and the volumes are given in units of mL (milliliters).
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Plz answer the first two questions and maybe the third. I will give brainliest.
Answers
Answer:
1. 24.45 moles
2. 437.90 grams
Bonus :
0.75 grams
Explanation:
Hope it was helpful ;)
In distillation,separation is achieved by difference in---
Answers
Answer:
relative volatility.
mark me brainliestt :))
Answer: in temperature
a student mixed 20 grams of salt into a beaker with 200 milliliters of warm water. then, the student set the cup of saltwater on a windowsill undisturbed for one week. what changes did the student observe? include what happened when salt was mixed with warm water and what most likely happened to the saltwater after one week.
Answers
Answer:
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Explanation:
Mn(OH)3 what is it called
Answers
Answer:
Lets start by looking at the elements We had Mn= manganese OH= Hydroxide We have a subscript of 3 Hence Manganese III HydroxideWhich statement describes how the binary ionic compound KBr is named?
Answers
Which statement describes how the binary ionic compound KBr is named? The metal is named first, and the name is unchanged. Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?
B. The metal is named first and the name is unchanged.
2. Which of these people would be more affected by air pollution that others?
O a person with lung disease
O an elderly person
all of these
a child with allergies
Answers
Cars are the leading cause of____
1. carbon dioxide
2. nitrogen oxide
3.carbon monoxide
pollution
Answers
Answer:
nitrogen oxide
Explanation:
not 100% sure
On the graph, which shows the potential energy curve of two N atoms, carefully sketch a curve that corresponds to the potential energy of two O atoms versus the distance between their nuclei.
Answers
Answer:
Explanation:
We are to carefully sketch a curve that relates to the potential energy of two O atoms versus the distance between their nuclei.
From the diagram, O2 have higher potential energy than the N2 molecule. Because on the periodic table, the atomic size increases from left to right on across the period, thus O2 posses a larger atomic size than N2 atom.
Therefore, the bond length formation between the two O atoms will be larger compared to that of the two N atoms.
When two oppositely charged particles are closer together, they have a ___________ attraction toward one another than if they are farther apart.
Answers
When two oppositely charged particles are closer together, they have a stronger attraction toward one another than if they are farther apart.
The electrostatic force, which is the force of attraction or repulsion between two charged particles, is the cause of this attraction. The magnitude of the electrostatic force between two charged particles is inversely proportional to the square of the distance between them and directly proportional to the product of their charges.
The inverse square law states that as the distance between two charged particles moves closer together, the electrostatic force between them grows as a result of a smaller denominator. Therefore, the stronger the attraction between two oppositely charged particles will be the closer they are.
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What is the function of the magnet in NMR spectroscopy?
Answers
The function of the magnet in Nuclear Magnetic Resonance (NMR) spectroscopy is to generate a strong, uniform magnetic field that aligns the nuclear spins of the sample being analyzed. This alignment allows for the detection and measurement of the interaction between the nuclear spins and an applied radiofrequency pulse.
In NMR spectroscopy, the magnet creates a static magnetic field (B0), which causes the nuclear spins of atoms with a magnetic moment, such as 1H and 13C, to align either parallel or anti-parallel to the field. The energy difference between these two alignments is proportional to the strength of the magnetic field, and results in distinct resonance frequencies for each nucleus.
When a radiofrequency (RF) pulse is applied at the appropriate frequency, it excites the nuclear spins, causing them to flip between the two energy states. After the pulse, the spins return to their equilibrium state, and the process of relaxation emits a detectable signal. This signal, called Free Induction Decay (FID), contains information about the chemical environment of the nuclei, which can be analyzed to provide insights into molecular structure and dynamics.
The quality and resolution of NMR spectra depend on the uniformity and stability of the magnetic field, which is why high-quality magnets, such as superconducting magnets, are essential in NMR spectroscopy. These magnets provide strong, stable magnetic fields that enable the accurate analysis of complex molecular systems.
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A balloon held at 273 K has an initial volume of 2.0 L at 1.0 atm of pressure. If the pressure is increased to 3.5 atm, what is the new volume of the balloon?
Answers
Answer: 5.5 atm
Explanation:
1)Grignard reagent when reacted with methanol will yield A) ethanol (B) secondary alcohols (C) tertiary alcohols (D ropanol (E) primary alcohol
Answers
When the reaction of Grignard reagent reacted with methanol will yield a tertiary alcohol. Therefore, Option C tertiary alcohol is correct.
Contains a carbon-metal link, Grignard reagents are chemicals used in catalysis. They generally result from the anhydrous reaction of magnesium metal with an alkyl or aryl halide. Because of their high reactivity, Grignard reagents frequently act as nucleophiles in organic reactions.
An alkyl group from a Grignard reagent binds to the oxygen atom of methanol (CH3OH) when it interacts with the methanol, breaking the carbon-metal connection. A precursor alkoxide is created as a result. The equivalent alcohol is then produced by protonating the intermediate alkoxide.
The reaction of a Grignard reagent with methanol leads to the formation of a tertiary alcohol.
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after 65 minutes, the amount of a particular radioisotope remaining is 3.13% of the initial amount. what is the half life of the radioisotope?
Answers
Answer:
13 mins
Explanation:
We need to find how many half lives are required to reach .0313
.0313 = 1/2^n log both sides and solve for n
log.0313 / log (1/2 ) = n where n= NUMBER of halflives
n = ~ 5 half lives
these 5 half lives took up 65 minutes
so EACH half life is 65/5 = 13 mins
Which formula represents a nonpolar molecule containing polar covalent bonds?
Answers
Answer:
Figure 2 represents a nonpolar molecule containing polar covalent bonds
Explanation:
The CO2 molecule is linear, formed by 3 atoms and the electronegativity variations are equal, so its dipolar moment will be null, and this molecule will be nonpolar, however, it has polar covalent bonds.
A 1.00 liter solution contains 0.31 M sodium acetate and 0.40 M acetic acid. If 0.100 moles of barium hydroxide are added to this system, indicate whether the following statements are TRUE or FALSE . (Assume that the volume does not change upon the addition of barium hydroxide.)
a. The number of moles of CH3COOH will remain the same.
b. The number of moles of CH3COO- will increase.
c. The equilibrium concentration of H3O+ will decrease.
d. The pH will decrease.
e. The ratio of [CH3COOH] / [CH3COO-] will remain the same.
Answers
Answer and Explanation:
The buffer solution is composed by sodium acetate (CH₃COONa) and acetic acid (CH₃COOH). Thus, CH₃COOH is the weak acid and CH₃COO⁻ is the conjugate base, derived from the salt CH₃COONa.
If we add a strong base, such as barium hydroxide, Ba(OH)₂, the base will dissociate completely to give OH⁻ ions, as follows:
Ba(OH)₂ ⇒ Ba²⁺ + 2 OH⁻
The OH⁻ ions will react with the acid (CH₃COOH) to form the conjugate base CH₃COO⁻.
Initial number of moles of CH₃COOH = 0.40 mol/L x 1 L = 0.40 mol
Initial number of moles of CHCOO⁻= 0.31 mol/L x 1 L = 0.31 mol
moles of OH- added: 2 OH-/mol x 0.100 mol/L x 1 L = 0.200 OH-
According to this, the following are the answers to the sentences:
a. The number of moles of CH₃COOH will remain the same ⇒ FALSE
The number of moles of CH₃COOH will decrease, because they will react with OH⁻ ions
b. The number of moles of CH₃COO⁻ will increase ⇒ TRUE
Moles of CH₃COO⁻ will be formed from the reaction of the acid (CH₃COOH) with the base (OH⁻ ions)
c. The equilibrium concentration of H₃O⁺ will decrease ⇒ FALSE
The equilibrium concentration of OH⁻ is increased
d. The pH will decrease⇒ FALSE
pKa for acetic acid is 4.75. We add the moles of base to the acid concentration and we remove the same number of moles from the conjugate base in the Henderson-Hasselbach equation to calculate pH:
\(pH= pKa + log \frac{[conjugate base + base]}{[acid - base]}\)
pH = 4.75 + log (0.31 mol + 0.20 mol)/(0.40 mol - 0.20 mol) = 5.15
Thus, the pH will increase.
Colligative properties of solutions include all of the following except: a. an increase in the osmotic pressure of a solution upon the addition of more solute b. elevation of the boiling point of a solution upon addition of a solute to a solvent c. an increase of reaction rate with increase in temperature d. depression of the freezing pont of a solution upon addition of a solute to a solvent e. depression of vapor pressure upon addition of a solute to a solvent
Answers
Answer:
Option C, an increase of reaction rate with increase in temperature
Explanation:
Colligative properties are as follows
a) Decrease of vapor pressure
b) Increase of boiling point
c) Reduction of freezing point
d) Increase of osmotic pressure
There is no impact on reaction rate and hence it is not a colligative property.
Thus, option c is the right choice
An increase of reaction rate with increase in temperature isn't an example
of colligative properties of solutions
Colligative properties of solutions depend on the ratio of the number of
solutes to that of the solvent(concentration) and not on the nature of the
substances involved.
Examples of colligative properties include vapor pressure lowering, boiling
point elevation, freezing point depression, and osmotic pressure. Increase of
reaction rate with increase in temperature is therefore not an example of
colligative properties of solutions.
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Let's do this!
Balance each equation so there are the same number of each type of atom on both sides of the
equation There is a chart above each problem to help you count the atoms
First-Count up the
number of atoms you
currently have Write
that number in the
chart for both sides of
the equation
Second-If the
numbers don't match,
try adjusting the
coefficients one at at
time Make sure to
change the number in
the chart
Remember- you can't
change the formulas!
2
Reactants
Mg
M
Mg
LI
Reactants
H
LO +
Products
Mg
N
L
O
H
но →
_Math
Products
LIOH
You should
do this in
pencil
Answers
The balanced chemical equations of the reactions are given below:
1. Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)
2. 2 Li (s) + 2 H₂O (l) ----> LiOH (aq) + H₂ (g)
What is a balanced equation?A balanced chemical equation is an equation in which the number of moles of atoms of elements in a given reaction is equal to the sum of the number of moles of atoms of each element that is produced.
A balanced chemical equation is in accordance with the law of conservation of mass which states that matter can neither be created nor destroyed.
When balancing chemical equations, numerical coefficients are added in front of moles of atoms of an element or moles of a given compound taking part in the reaction.
The balanced chemical equation of the reaction of magnesium and water as well as the reaction of lithium and water is given below:
Magnesium and water:
Mg (s) + 2 H₂O (l) ----> Mg(OH)₂ (s) + H₂ (g)
Lithium and water:
2 Li (s) + 2 H₂O (l) ----> LiOH (aq) + H₂ (g)
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A metal carbonate, XCO3 of mass 2.012 g was heated resulting in the formation of XO, a metal oxide and carbon dioxide with a mass of 0.855 g according to the reaction shown below: XCO3 (s) → XO (s) + CO2 (g) (Atomic mass of O-15.999 g/mol; H-1.008 g/mol; C-12.011 g/mol).
Answers
The metal X has an approximate molar mass of 42.36 g/mol and the metal is most likely calcium.
What is the molar mass of XCO₃?The molar mass of the metal carbonate XCO₃ and identify the metal X, we need to calculate the number of moles of XCO₃ and CO₂ using the given masses and molar masses.
The molar mass of CO₂ (carbon dioxide) is 12.011 g/mol (for carbon) + 2 * 15.999 g/mol (for oxygen) = 44.01 g/mol.
The number of moles of CO₂ can be calculated using the formula:
moles of CO₂ = mass of CO₂ / molar mass of CO₂
moles of CO₂ = 0.855 g / 44.01 g/mol
moles of CO₂ ≈ 0.01944 mol
Since the reaction stoichiometry is 1:1 between XCO₃ and CO₂, the number of moles of XCO₃ is also approximately 0.01944 mol.
molar mass of XCO₃ = mass of XCO₃ / moles of XCO₃
molar mass of XCO₃ = 2.012 g / 0.01944 mol
molar mass of XCO₃ ≈ 103.38 g/mol
The molar mass of XCO₃ is approximately 103.38 g/mol.
To determine the metal X:
molar mass of X = molar mass of XCO3 - molar mass of CO3
molar mass of X = 103.38 g/mol - (12.011 g/mol + 3 * 15.999 g/mol)
molar mass of X ≈ 42.36 g/mol
Metal X is most likely Calcium that has a molar mass of 40 g/mol
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what is the molar mass of potassium
permanganate in amu?
Answers
Answer:
158.033944 g/mol
Explanation:
What volume, in liters, is occupied by 1.5 x 1023 atoms of argon gas (Ar) at STP?
Answers
ANSWER
The volume of Argon gas is 5.60L
STEP-BY-STEP EXPLANATION:
Given information:
The number of atoms of argon = 1.5 x 10^23 atoms
To find the volume of Argon, we need to find the number of moles of argon, then, we assume the number of moles of argon to be x
To find the number of moles, we will need to apply the below formula
\(\text{Number of atoms = mole x Avogadro's number}\)Recall that, Avogadro's number = 6.022 x 10^23
\(\begin{gathered} 1.5\cdot10^{23}\text{ = x }\cdot\text{ 6.022 }\cdot10^{23} \\ \text{Isolate x by dividing through by 6.022 }\cdot10^{23} \\ x\text{ = }\frac{1.5\cdot10^{23}}{6.022\cdot10^{23}} \\ x\text{ = 0.2498 mole} \end{gathered}\)Since x represents the number of moles of argon gas, then, the mole of argon gas is 0.2498 mole.
The next step is to find the volume of Argon in liters
Recall that, at S.T.P, 1 mole is equivalent to 22.4L
Let x represent the volume in liters of argon
Then, this can be solved mathematically below
\(\begin{gathered} 1\text{ mole }\rightarrow\text{ 22.4 L} \\ 0.2498\text{ mole }\rightarrow\text{ xL} \\ \text{Mathematically,} \\ 1\text{ = 22.4} \\ 0.2498\text{ = x} \\ \text{Cross multiply} \\ 1\cdot\text{ x = 0.2498 }\cdot\text{ 22.4} \\ x\text{ = }5.60L \end{gathered}\)Therefore, the volume of Argon gas is 5.60L
Write the net ionic equation for the acid-base reaction
PH3(aq) + HCl(aq) - PH4Cl(aq)
Answers
Explanation:
i dont understand dont you already have the equation?
The net ionic equation for the acid-base reaction PH\(_3\)(aq) + HCl(aq) \(\rightarrow\) PH\(_4\)Cl(aq) is PH\(_3\)(aq) + H⁺ (aq) \(\rightarrow\) PH\(_4\)⁺ .
What is net ionic equation?Chemical reaction equations can be written in a variety of ways. Unbalanced chemical equations, which identify the species involved, balanced chemical equations, which identify the number and type of species, molecular equations, that also express compounds as molecules rather than component ions, and net ionic equations, which only address the species which contribute to a reaction, are some of the most popular.
A chemical equation for just a process known as the net ionic equation only includes the species that are really involved in the reaction.
PH\(_3\)(aq) + HCl(aq) \(\rightarrow\) PH\(_4\)Cl(aq)
PH\(_3\)(aq) + H⁺ (aq) + Cl⁻ (aq) \(\rightarrow\) PH\(_4\)⁺ (aq) + Cl⁻ (aq)
PH\(_3\)(aq) + H⁺ (aq) \(\rightarrow\) PH\(_4\)⁺
Therefore, the net ionic equation for the acid-base reaction is PH\(_3\)(aq) + H⁺ (aq) \(\rightarrow\) PH\(_4\)⁺ .
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