Answer:
The atoms are affected by light.Please give me Brainliest it would mean a lot
Why is it important to conserve or save our energy resources?
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answer:
reducing energy use limits the number of carbon emissions in the environmentconserving energy produces a higher quality of life. Reduced emissions result in cleaner air qualityit helps create a healthier planet, or at least helps sustain the resources we already haveexplanation:
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Which component of weather describes the weight of the atmosphere pressing down on Earth? (2 points)
Air pressure
Air temperature
Precipitation
Wind direction
Answer:
Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.
Explanation:
How do we know if molecules have kinetic energy?
At which position on the diagram would an apple have the greatest potential energy?
Answer:
Position 1 because it is the highest from the ground.
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Describe the bonding process when two hydrogen atoms combine to
form a diatomic molecule of hydrogen.
Answer:
The electrons located between the two nuclei are bonding electrons. A hydrogen molecule forms from two hydrogen atoms, each with one electron in a 1 s orbital. The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond. The bond is represented either as a pair of dots or as a solid line.
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Answer:
c
Explanation:
what does energy mean?
Answer:
strength and vitality required for sustained physical or mental activity
Explanation:
Answer:
energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.
what are the affects of increasing thermal energy B
Answer:
The molecules tend to speed up and move faster throughout the substance once thermal energy increases. This is evident whenever we heat up water as its molecules tend to move faster throughout the water as thermal energy tends to increase
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What statements are true about mutations to DNA?
Answer:
Is this a general question or is there supposed to be a picture
Explanation:
Help me please!
Main-block transition metals, such as iron, make good building materials for all of the following reasons EXCEPT____.
A. Resistance to corrosion
B. Insulation
C. Strength
D. High density
calculate the mass of 0.5mols of CH3COOH
Answer:
30 g
Explanation:
In order to convert from moles of CH₃COOH to grams, we need to use its molar mass:
Molar mass of CH₃COOH= (Molar Mass of C)*2 + (Molar Mass of H)*4 + (Molar Mass of O)*2 = 60 g/molNow we convert moles into grams:
0.5 mol * 60 g/mol = 30 gSo 0.5 moles of CH₃COOH have a mass of 30 grams.
moles are in 4.3 * 10^22 molecules of H3PO4
Answer:
The answer is 0.073
Explanation:
Final step: 0.73 x 10^-1
What do you understand by a chemical reaction
Answer:
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
What is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?
1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
q = mCpΔT
Solve for Cp —> Cp = q/mΔT
q = -6700 J (negative because it released heat)
m = 70 g
ΔT = Final temp - initial temp = 25 - 90 = -65°C
Cp = (-6700 J) ÷ (70 g)(-65°C)
= 1.47 J/g°C
Hence, 1.47 J/g°C is the specific heat capacity of a 70 g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C.
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What is the relationship between radioactive decay and radiometric dating?
Answer:
Radiometric dating, is called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
Explanation:
:)
How many moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas?
Answer:
2.5 mole O2 should react (2 * 2.5) = 5.0 mole H2 but there is 6.0 mole H2. H2 remain in excess. O2 is the limiting reactant. mole of H2O formed = 2 * 2.5 = 5.0 mole.
Moles of water are produced when 6.0 moles of hydrogen gas react with 2.5 moles of oxygen gas
Balanced equation: 2H2 + O2 → 2H2O
2.5 mole O2 should react (2 × 2.5) = 5.0 mole
H2 but there is 6.0 mole H2.
H2 remain in excess. O2 is the limiting reactant.
mole of H2O formed = 2 × 2.5 = 5.0 mole.
= 5.0 mole
If less than 6 moles of oxygen are available per mole of glucose, oxygen is the limiting reactant. The ratio is 6 mole oxygen per 1 mole glucose, OR 1 mole oxygen per 1/6 mole glucose.
Limiting reactant-Limiting reactant- the reactant that determines the amount of product that can be produced because of the amount of that reactant present. Whichever reactant yields the LEAST amount of product is the limiting reactant. This will be completely used up in the reaction. After the reaction is complete, there will be product, and unused excess reactant.Learn more about oxygen gas, refer
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When electrons lost a blank ion is formed
When electrons are gained a blank ion is formed
Answer:
I love it
Explanation:
☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
When electrons are lost, a positively charged ion is formed. When electrons are gained, a negatively charged ion is formed. (I like the car)
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Have a nice day noona/hyung!~ ￣▽￣❤️
2Na + 2H2O → 2NaOH+ H2
How many grams of sodium would be needed to produce 1.00kg of sodium hydroxide?
Answer:
575 g
Explanation:
1 kg of sodium hydroxide is 1000/40=25 mol.
So 25 mol of sodium will be needed.
25 mol of sodium is 575 g.
According to the stoichiometry of the given chemical equation, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.
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.
46 g sodium gives 80 g sodium hydroxide, thus 1000 g sodium hydroxide requires 46×1000/80=575 g sodium.
Thus, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.
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What is the correct illustration of the bonding that occurs in H2O?
Answer:
covalent is the bonding that occurs in H2O
Explanation:
What can the period number of an element tell us about that element?
Answer:
All of the elements in a period have the same number of atomic orbitals.
Explanation:
Which is an example of a homoozygous genotype? (There can be more than one answer)
Hh
HH
hh
Answer:
HH and hh
Explanation:
they are the same
46:56
A piece of carpet is 8 feet wide and 12 feet long. The carpet needs to be reduced by a scale factor so that the reduced carpet is 2 feet wide. What is the area of the reduced carpet?
6 square feet
12 square feet
24 square feet
48 square feet
Answer:
12 square feet i jope.please be right
A gas has a volume of 240.0mL at 25.0 oC and 0.79 atm. Calculate its volume at STP (1 atm and 0 oC).
Answer:
189.6 mL
Explanation:
As per Boyles law when a gas is kept at a constant temperature and mass in a closed container, the volume and pressure vary inversely.
P1V1= P2V2
Here, P1 = 0.79 atm, V1 = 240 ml, P2= 1 atm
therefore, substituting values in above equation we get
0.79×240 = 1×V2
⇒V2 = 189.6 ml
therefore, its volume at STP (1 atm and 0 oC) = 189.6 ml
1. Calculate the molarity of a solution containing 49.3g of dissolved naphthalene (C10H8) in 217g benzene (C6H6).
2. A solution is prepared by mixing 94.2g of H2O, and 58.7g of ethanol, C2H5OH. Determine the mole fractions of each substance.
3. If you use 2.17mol of sucrose (C12H22O12) and dissolve this into 0.500kg of H2O, what will be the change in the freezing point of your solution? The freezing point depression of water (Kf) is 1.86 degrees Celsius/m.
Answer:
1. 1.56 M
2. Water → 0.803
Ethanol → 0.197
3. - 8.07°C
Explanation:
1. To solve this problem, we need benzene's density in order to determine the volume.
We assume the volume of solvent, as the volume of solution
Density for benzene is 0.8786 g/mL.
Density = m/V → V = m/density
Volume = 217 g /0.8786 g/mL = 247 mL
We convert the mass to moles and then, to mmoles
49.3 g . 1mol / 128g . 1000mmol / mol = 385.1 mmol
M = 385.1 mmol / 247mL = 1.56 M
2. We determine moles of each, solute and solvent
94.2 g. 1mol /18g = 5.23 moles of water
58.7 g . 1mol /46g = 1.28 moles of ethanol.
Total moles = 5.23 + 1.28 = 6.51
Mole fraction of water = Moles of water / Total moles
Mole fraction of ethanol = Moles of ethanol / Total moles
Water → 5.23 / 6.51 = 0.803
Ethanol → 1.28 / 6.51 = 0.197
3. Freezing point depression → ΔT = Kf . m . i
i = Van't Hoff factor, ions that are present in the solution.
As the solute is organic, i = 1.
Kf = 1.86 °C/m
m = molality (moles of solute in 1kg of solvent)
2.17 mol / 0.5kg = 4.34 m
ΔT = Freezing T° of pure solvent - Freezing T° of solution.
We replace data → 0° - Freezing T° of solution = 4.34m . 1.86°c/m . 1
Freezing T° of solution = - 8.07°C
How many moles of solute should be dissolved into 3.0 L of solvent to make a concentration of 2.0 M?
6.0 mol
1.5 mol
0.67 mol
1.0 mol
Answer:
There are 0.1 moles of solute in 250 mL of 0.4 M solution.
Students were asked to select methods to increase the rate of dissolving a solid. Which methods would increase the rate?
Increasing the surface area, stirring or agitating the mixture, raising the solvent's temperature, and employing a solvent with a stronger polarity or one that is more similar to the solid's chemical makeup are all ways to speed up the dissolving process.
The methods to increase the rate of dissolving a solid.There are several methods that can increase the rate of dissolving a solid, including:
Increasing the surface area of the solid by crushing, grinding or pulverizing it into smaller pieces.
- Stirring or agitating the mixture, which helps to distribute the solvent and increase contact between the solvent and the solid.
- Increasing the temperature of the solvent, which increases the kinetic energy of the solvent molecules, making them more likely to collide with and dissolve the solid.
- Using a solvent that has a higher polarity or is more similar in composition to the solid, which can increase the attraction between the solvent and the solid and promote faster dissolving.
Therefore, the methods that would increase the rate of dissolving a solid are increasing surface area, stirring or agitating the mixture, increasing the temperature of the solvent, and using a solvent that has a higher polarity or is more similar in composition to the solid.
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is.
O2(g) + 2H2O(l) + 4e- -----------------> 4OH−(aq)
oxidation or reduction?
Answer:
Reduction
Explanation:
Oxidation is a process that involves loss of electrons.
Reduction is a process that involves gain of electrons.
In this equation, the electrons (4e-) are in the reactant side. This means that it is gain of electrons.
The reaction is a reduction reaction.
Which organism is an example of a producer?
a. Wheat
b. Pigeon
c. cheetah
d. mushroom
Answer: wheat
Explanation: a pigeon does not produce food nor a cheetah or mushroom because a mushroom breaks down subsistence.
UGRENT! Please help showing all work
Answer:
a. The limiting reactant is Ca(OH)₂
b. The theoretical yield of CaCl₂ is approximately 621.488 grams
c. The percentage yield of CaCl₂ is approximately 47.06%
Explanation:
a. The given chemical reaction is presented as follows;
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Therefore;
One mole of Ca(OH)₂ reacts with two moles of HCl to produce one mole of CaCl₂ and two moles of water H₂O
The mass of HCl in an experiment, m₁ = 229.70 g
The mass of Ca(OH)₂ in an experiment, m₂ = 207.48 g
The molar mass of HCl, MM₁ = 36.458 g/mol
The molar mass of Ca(OH)₂, MM₂ =74.093 g/mol
The number of moles of HCl, present, n₁ = m₁/MM₁
∴ n₁ = m₁/MM₁ = 229.70 g/(36.458 g/mol) ≈ 6.3 moles
The number of moles of Ca(OH)₂, present, n₂ = m₂/MM₂
∴ n₂ = m₂/MM₂ = 207.48 g/(74.093 g/mol) ≈ 2.8 moles
The number of moles of Ca(OH)₂, present, n₂ = 2.8 moles
According the chemical reaction equation the number of moles of HCl the 2.8 moles of Ca(OH)₂ will react with, = 2.8 × 2 moles = 5.6 moles of HCl
Therefore, there is an excess HCl in the reaction and Ca(OH)₂ is the limiting reactant
b. According the chemical reaction equation the number of moles of CaCl₂ produced in he reaction by the 2.8 moles of Ca(OH)₂ = 2.8 × 2 moles = 5.6 moles of CaCl₂
The molar mass of CaCl₂ = 110.98 g/mol
The mass of the 5.6 moles of CaCl₂ = 5.6 moles × 110.98 g/mol ≈ 621.488 grams
The theoretical yield of CaCl₂ ≈ 621.488 grams
c. Given that the actual mass of CaCl₂ produced = 292.5 grams, we have;
The percentage yield of CaCl₂ = The actual yield/(The theoretical yield) × 100
∴ The percentage yield of CaCl₂ = (292.5 g)/(621.488 g) × 100 ≈ 47.0644646397%
The percentage yield of CaCl₂ ≈ 47.06%.
Give reasons :
Concentrated H2SO4 cannot be used instead of dilute H2SO4 in laboratory preparation of hydrogen gas why ?