Answers
Answer:
Quarter and half moons
Explanation:
Related Questions
In your own words what is Substance. In your own words what is Mixture
Answers
Answer:
Subtance is a matter such as gold,copper, and oxygen.
Mixture is when you combine two different substances.
Is the correlation between time spent studying each day positive or negative?
Answers
Answer:
Positive.
Explanation:
The slope is positive and increasing, thus meaning there is a positive correlation between time spent studying each day and performance.
Which of the following options correctly describe the different types of UV radiation ? 1. radiaiton has the shortest wavelength 2. the least damaging to the Earths surface 3.radiation with a wavelength of 300 nm is classified as
Answers
Option 1 is correct. There are three types of UV radiation: UVA, UVB, and UVC. UVC has the shortest wavelength, around 100-280 nm, but is mostly absorbed by the Earth's atmosphere and doesn't reach the surface. UVB has a wavelength of 280-320 nm and is responsible for sunburns and skin damage. UVA has the longest wavelength, around 320-400 nm, and can penetrate deeper into the skin, causing aging and wrinkling.
Option 2 is incorrect because UV radiation, in general, can be damaging to the Earth's surface, causing skin cancer, harming plant life, and contributing to climate change.
Option 3 is partially correct because UV radiation with a wavelength of 300 nm falls within the UVC range, but it's important to note that this type of radiation is mostly absorbed by the ozone layer before reaching the Earth's surface.
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Explain how the heat and phase changes affects the environment? Give examples.
(5-7 sentences)
Answers
During a phase change energy my be added or subtracted from a system, but the temperature will not change. The temperature will change only when the phase change has completed. No temperature change occurs from heat transfer if ice melts and becomes liquid water (i.e., during a phase change). For example, consider water dripping from icicles melting on a roof warmed by the Sun. Conversely, water freezes in an ice tray cooled by lower-temperature surroundings. Energy is required to melt a solid because the cohesive bonds between the molecules in the solid must be broken apart so that the molecules can move around at comparable kinetic energies; thus, there is no rise in temperature.
Under identical current and concentration conditions, which of these metal ion solutions would deposit reduced metal mass onto the cathode the fastest?
A. Ba2+
B. Sn2+
C. Ni2+
D. Cd2+
E. Pb2+
Answers
Option E is the correct answer
The rate of deposition of metal ions onto the cathode during electrolysis is dependent on several factors, including the concentration of the metal ion in solution, the current applied, and the reduction potential of the metal ion.
Of the given options, the metal ion with the most negative reduction potential is expected to deposit onto the cathode the fastest. This is because the more negative the reduction potential, the easier it is for the metal ion to gain electrons and be reduced at the cathode.
From the options given, the order of decreasing reduction potential is as follows:
Pb2+ > Cd2+ > Sn2+ > Ni2+ > Ba2+
Therefore, Pb2+ is expected to deposit reduced metal mass onto the cathode the fastest under identical current and concentration conditions. Option E is the correct answer.
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A piece of solid tin is submerged in silver nitrate solution. A reaction occurs producing tin (iv) nitrate solution and solid silver. Write the word equation, write the skeletal equation and balanced chemical equation for the reaction.
Answers
Answer: For the given reaction-
The word equation is Tin + silver nitrate = tin (IV) nitrate + silverThe skeletal equation is \(Sn + AgNO_{3} \rightarrow N_{4}O_{12}Sn + Ag\)The balanced chemical equation is \(Sn(s) + 4AgNO_{3}(aq) \rightarrow N_{4}O_{12}Sn(aq) + 4Ag(s)\)Explanation:
When names of chemicals or species involved in a chemical reaction are represented in the form of an equation then it is known as a word equation.For example, Tin + silver nitrate = tin (IV) nitrate + silver
The 'equal to' symbol denotes a forward arrow.
A skeletal equation contains only the chemical formula of species involved in a chemical reaction.For example, \(Sn + AgNO_{3} \rightarrow N_{4}O_{12}Sn + Ag\)
A chemical equation which contains same number of atoms on both reactant and product side along with states of species is called a balanced chemical equation.\(Sn(s) + 4AgNO_{3}(aq) \rightarrow N_{4}O_{12}Sn(aq) + 4Ag(s)\)
Can someone please help!!??! I will mark the
brainliest to the best answer!
(25 points!)
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A candle burning is an example of _____.
Answers
Answer:
The burning of a candle is both a physical and a chemical change.
Explanation:
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plese hurrry Which of the following best describes a predator/prey relationship in the forest? 100 points.
Question 8 options:
mistletoe growing on a Mesquite tree
a deer eating the green leaves and berries on a holly bush
bacteria and mold break down fallen leaves on the forest floor
a spotted owl swoops down and captures a mouse
Answers
Answer: A spotted owl swoops down and captures a mouse
Explanation: The owl is the predator and the prey is the mouse. :)
Answer:
A spotted owl swoops down and captures a mouse best describes a predator/prey relationship in the forest.at a temperature of 250k, the molecules of an unknown gas, z, have an average velocity equal to that of hi at 500k. what is the identity of the gas?
Answers
The identity of the gas is hydrogen (H2).The average kinetic energy of gas molecules is directly proportional to the temperature. Using the formula for kinetic energy (KE = (1/2)mv^2), we can equate the kinetic energy of the unknown gas (Z) at 250K to that of hydrogen (H2) at 500K.
Since the average velocity is proportional to the square root of the kinetic energy, we can set up the following equation:
(1/2)mz(vz^2) = (1/2)mh(vh^2)
Given that mz is the molar mass of gas Z and mh is the molar mass of hydrogen (2 g/mol), and vz is the velocity of gas Z at 250K, and vh is the velocity of hydrogen at 500K.We can simplify the equation by canceling out the common factors:
mz(vz^2) = mh(vh^2)
The gas with an average velocity equal to hydrogen at twice the temperature is hydrogen gas itself (H2).
Since the average velocity of gas Z is equal to the average velocity of hydrogen at twice the temperature, the molar mass of gas Z must be half of the molar mass of hydrogen.
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What is the name of the molecule below?A. 1-butyneOB. 1-ethyneC. 2-butyneOD. 2-ethyneH-C=C–CH, CH3SUBMIT
Answers
In order to find a name of a Hydrocarbon molecule, we need to look for the main carbon chain first, this will be the chain with the highest number of carbon atoms, and in this molecule, we have 4 carbon atoms, therefore we have a 4 carbon molecule, the prefix for this type of molecule is But.
We also have a triple bond in the first carbon, the suffix for triple bonds is "yne"
Therefore, if we add all these informations, we will have 1-butyne, letter A
Barium-131 is used in the detection of bone tumors. The half-life of barium-131 is approximately 12 days. How long will it take for the radiation level of barium-131 to drop to 1/4 of its original level?.
Answers
The amount of barium-131 radiation will be reduced to 1/4 of its initial level after 24 days.
How long is a half-life in terms of time?The period of time needed for the reactant concentration to drop to half its initial value is known as the half-life of a reaction. t 1/2 = 0.693/k is a constant that relates to the reaction's rate constant and represents the half-life of a first-order reaction.
How does a first order reaction's half-life equation work?t1/2 = 0.693/k is a constant that relates to the reaction's rate constant and represents the half-life of a first-order reaction.
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for 511 nm visible light, calculate its frequency (, hz), wavenumber (˜, cm−1), and photon energy (j).
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a. The frequency for visible light of 511 nm is 5.87 x 10¹⁴ Hz.
b. The wave number is 1.957 x 10³ cm⁻¹.
c. the photon energy is 3.89 x 10⁻¹⁹ J.
To determine the frequency the wavelength of visible light, we know that the speed of light (c) is given:
byc = λν
where λ is the wavelength and ν is the frequency of the light.
So, frequency,
ν = c/λ
= (3.0 x 10⁸ m/s) / (511 x 10⁻⁹ m)
ν = 5.87 x 10¹⁴ Hz
Wave number (˜) is the reciprocal of the wavelength (λ). Therefore, ˜ is given by;
˜ = 1/λ
= 1 / 511 x 10⁻⁹ m
= 1.957 x 10³ cm⁻¹
Photon energy (E) of a photon of light is given by;
E = hν
where h is the Planck's constant = 6.63 x 10⁻³⁴ J⋅s
E = hν
= 6.63 x 10⁻³⁴ J⋅s × 5.87 x 10¹⁴ Hz
E = 3.89 x 10⁻¹⁹ J
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The frequency for 511 nm visible light is 5.87 × 10¹⁴ Hz, the wave number is 1.957 × 10³ cm⁻¹, and the photon energy is 3.89 × 10⁻¹⁹ J.
To find the frequency of the wavelength of visible light, it is required that the speed of light (c) is given by:
c = λν
In which
λ = wavelength
ν = the frequency of the light
So, the frequency is,
\(v = \frac{c}{\lambda}\)
= \(\rm (3.0 \times 10^8 \ m/s) / (511 \times 10^-^9 m)\)
\(v = 5.87 \times 10^1^4 \ Hz\)
The reciprocal of wavelength is the wave number. Consequently, is provided by;
= \(\frac{1}{\lambda}\)
= \(\frac{1}{511 \times 10^-^9\ m}\)
= 1.957 × 10³ cm⁻¹
Photon energy (E) of a photon of light is given by;
E = hν
In which h is the Planck's constant:
= 6.63 × 10⁻³⁴ J⋅s
E = hν
= 6.63 x 10⁻³⁴ J⋅s × 5.87 × 10¹⁴ Hz
E = 3.89 x 10⁻¹⁹ J
Thus, the frequency for 511 nm visible light is 5.87 × 10¹⁴ Hz, the wave number is 1.957 × 10³ cm⁻¹, and the photon energy is 3.89 × 10⁻¹⁹ J.
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diene and dienophile would you need to prepare 1-methyl-4-propylcyclohexene?
Answers
Yes, you would need diene and dienophile to prepare 1-methyl-4-propylcyclohexane.
Here's how it can be done:
A diene is an organic molecule that contains two carbon-carbon double bonds that are separated by one single bond, while a dienophile is an organic molecule that reacts with a diene to form a cycloaddition reaction.
A Diels-Alder reaction is a cycloaddition reaction that involves a diene and a dienophile. The reaction occurs in a concerted fashion, meaning that it takes place in one step.
To prepare 1-methyl-4-propylcyclohexane, the following steps should be taken:
Step 1 : First, prepare the diene 1-methylcyclohex-1,3-diene is the diene used in this reaction. It can be synthesized from 1-methylcyclohexene via a bromination and dehydrobromination process.
Step 2: Synthesize the dienophile
The dienophile is typically synthesized from an unsaturated ketone or aldehyde. The dienophile used in this reaction is 2-methylbut-2-enal. This dienophile can be synthesized from the reaction of 2-methyl-2-butene with ozone followed by oxidative work-up.
Step 3: The Diels-Alder reaction 1-methylcyclohex-1,3-diene and 2-methylbut-2-enal can be combined to form the desired product, 1-methyl-4-propylcyclohexane, through the Diels-Alder reaction.
This is accomplished by heating the diene and dienophile in an appropriate solvent, such as dichloromethane or cyclohexane, in the presence of a Lewis acid catalyst, such as aluminium chloride.
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Balance the following reaction, which occurs in acidic aqueous solution, using the smallest possible integer coefficients and adding H+ and H2O as necessary:
Cu(s) + MnO4-(aq) ---> Cu2+(aq) + Mn2+(aq)
Answers
The balanced redox equation for \(Cu(s)\) and \(MnO_4-(aq)\) in acidic solution is \(5Cu(s) + 2MnO_4-(aq) + 16H+(aq) \rightarrow 5Cu_2+(aq) + 2Mn_2+(aq) + 8H_2O(l)\).
Redox equationFirst, let's write out the half-reactions:
Oxidation: \(Cu(s) \rightarrow Cu_2+(aq) + 2e-\)Reduction: \(MnO_4-(aq) + 8H+(aq) + 5e- \rightarrow Mn_2+(aq) + 4H_2O(l)\)Next, we need to balance the number of electrons transferred in each half-reaction. We can do this by multiplying the oxidation half-reaction by 5 and the reduction half-reaction by 2:
Oxidation: \(5Cu(s) \rightarrow 5Cu_2+(aq) + 10e-\)Reduction: \(2MnO_4-(aq) + 16H+(aq) + 10e- \rightarrow 2Mn_2+(aq) + 8H_2O(l)\)Now, we can add the two half-reactions together and cancel out any species that appear on both sides of the equation:
\(5Cu(s) + 2MnO_4-(aq) + 16H+(aq) \rightarrow 5Cu_2+(aq) + 2Mn_2+(aq) + 8H_2O(l)\)
Finally, we can simplify the coefficients by dividing each one by the greatest common factor, which is 2 in this case:
\(5Cu(s) + 2MnO_4-(aq) + 16H+(aq) \rightarrow 5Cu_2+(aq) + 2Mn_2+(aq) + 8H_2O(l)\)
So, the balanced equation is:
\(5Cu(s) + 2MnO_4-(aq) + 16H+(aq) \rightarrow 5Cu_2+(aq) + 2Mn_2+(aq) + 8H_2O(l)\)
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I need help with this question
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Answer:
there is no question posted
An 80. 0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2. 5 g of this isotope is now left. What is its half-life? days.
Answers
Half life period for the reaction where deduction of mass takes places is 8 days.
What is half life?Half life period of any reaction is that time where half concentration of reactant get converted into product.
Here we can calculate the half life through the below equation:
\($m = {m^'} \times {\left( {\frac{1}{2}} \right)^{\frac{t}{T}}}$\)
where, m' = initial mass of iodine = 80g
m = remaining mass = 2.5g
t = taken time = 40 days
T = half life
By putting this all value in above equation, we get
\(.$\begin{array}{l}2.5 = 80 \times {\left( {\frac{1}{2}} \right)^{\frac{{40}}{T}}}\\\frac{{2.5}}{{80}} = {\left( {\frac{1}{2}} \right)^{\frac{{40}}{T}}}\\{\left( {\frac{1}{2}} \right)^5} = {\left( {\frac{1}{2}} \right)^{\frac{{40}}{T}}}\\5 = \frac{{40}}{T}\\T = 8\end{array}$\)
Hence, half life period of this reaction is 8 days.
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A scientist grew bacteria on gel in her lab.
She wanted to find out if bacteria would grow faster on gel A or gel B.
she placed a few bacteria on gel A and a few on gel B.
After 24 hours, she observed how many bacteria were present.
Identify the independent and dependent variables.
Answers
Answer:
The independent variable is type of gel and the dependent variable is the number of bacteria.
Explanation:
An experiment generally tests how one variable is affected by another. The affected variable is called the dependent variable. In the plant experiment shown above, the dependent variable is plant growth. The variable that affects the dependent variable is called the independent variable. In the plant experiment, the independent variable could be fertilizer—some plants will get fertilizer, others will not. The scientists change the amount of the independent variable (the fertilizer) to observe the effects on the dependent variable (plant growth). An experiment needs to be run simultaneously in which no fertilizer is given to the plant. This would be known as a control experiment. In any experiment, other factors that might affect the dependent variable must be controlled. In the plant experiment, what factors do you think should be controlled? (Hint: What other factors might affect plant growth?)
is it possible for cells to overcome the effects of alkylating agents? how?
Answers
1. Lithium, water, edible salt, chalk, Carbon, Lime, Nitrogen, Potassium, Oxygen,
Iodides, Iron, Chlorine, etc are some matters.
(a) Expressing the matters of the stem by symbol and formula separate the elements
and compounds. ---3 marks
Answers
Answer:
Explanation:
An atom is the smallest unit of an element that can take part in a chemical reaction. Atoms (and there corresponding symbols) mentioned in the question are
Lithium ⇒ Li
Carbon ⇒ C
Nitrogen ⇒ N
Potassium ⇒ K
Oxygen ⇒ O
Iron ⇒ Fe
Chlorine ⇒ Cl
A compound is substance that contains two or more atoms that are chemically combined and can be represented with a chemical formula. The compounds (and there corresponding formula) mentioned in the question are
Water ⇒ H₂O
Edible salt (sodium chloride) ⇒ NaCl
Chalk (calcium carbonate) ⇒ CaCO₃
Lime (calcium oxide) ⇒ CaO
Iodides (such as sodium iodide and potassium iodide) ⇒ NaI and KI respectively
why was it so important that the electron was smaller than the atom?
Answers
Answer:
because electron is a negetively charge particle that orbits the outer part of atom and despite being small it is a strong proton.
Explanation:
an object is moving to the right at a constant veloxity. what will happen if a force of 20 N starts acting on it in the opposite direction
Answers
Answer:
Explanation:
The objects velocity will decrease because the force is opposing its motion
7. What is one of the BEST actions the US government can take to slow global warming?
-provide tax credits to those who carpool
-encourage people to buy electronic books versus paperbacks or hardbacks
-produce commercials that urge people to recycle
-invest in clean technologies such as wind and solar power
Answers
one of the BEST actions the US government can take to slow global warming is invest in clean technologies such as wind and solar power
What is the US government doing about global warming?EPA works with industry and others to reduce greenhouse gas emissions through regulatory initiatives and partnership programs. Within the Agency, EPA implements a range of strategies to reduce its own greenhouse gas emissions, increase energy efficiency, and take other steps to reduce its carbon footprintReaching 100% carbon pollution-free electricity by 2035. Achieving a net-zero emissions economy by 2050. Delivering 40% of the benefits from federal investments in climate and clean energy to disadvantaged communitiesMobilizing a whole-of-government approach, the United States is scaling up action at home and abroad to put the world on a path to reach net-zero emissions by 2050 and to achieve the global goal on adaptation. Learn more about the United States at COP27 and the U.S. Center
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A sample of solid tin is heated with an electrical coil. If 39.6 J of energy are added to a 14.3g sample initially at 24.2oC, what is the final temperature of the tin? cSn = 0.21J/g.oCa. 35.2oC b. 37.4oC c. 43.1oC d. 67.4oC e. 94.7oC
Answers
A sample of solid tin is heated with an electrical coil. If 39.6 J of energy are added to a 14.3g sample initially at 24.2oC, what is the final temperature of the tin - 37.4oC.
The heat energy required to raise the temperature of the solid tin can be calculated using the formula:
q = mcΔT
where q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
Rearranging the formula, we get:
ΔT = q/(m*c)
Substituting the given values, we get:
ΔT = 39.6 J / (14.3 g * 0.21 J/g.oC) = 12.64 oC
Therefore, the final temperature of the tin is:
24.2 oC + 12.64 oC = 36.84 oC
Rounding off to one decimal place, the final temperature is approximately 37.4 oC. Therefore, the correct answer is (b) 37.4oC.
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PLZ HELP I NEED IT ASAP
Answers
A solid metal sphere has a volume of 0.0041 m² and a mass of 0.859 kg. Determine the
density in g/cm³
Answers
The density in g/cm³ is 0.2095 g/cm³.
The mass of a material substance per unit volume is known as density. The equation for density is d = M/V, where d represents density, M is mass, and V is volume. Density is often measured in grams per cubic centimeter. The weight of an object can be calculated by dividing its mass by the acceleration of gravity; this value is often more significant practically than the mass.
Other tables include information on the weight of various materials per unit volume; this quantity is also known as weight density, specific weight, and unit weight. also take a look at specific gravity. The most popular way to indicate particle density is as n, which instead of referring to the number of particles per unit volume
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What are the potential benefits from storing cord blood? What are the risks or costs?
Answers
Answer:
Cord blood contains cells called hematopoietic stem cells. These cells can turn into any kind of blood cell and can be used for transplants that can cure diseases such as blood disorders, immune deficiencies, metabolic diseases, and some kinds of cancers.
Explanation:
When 496. 5 grams of Pb(NO3)2 reacts completely with KBr, how much will the
total mass of the products be? Explain your answer.
Mass mass problem - mass of reactant to mass of product
Answers
The total mass of the products is 853.8 g.
What is the total mass of the products?We know that we have to apply the principles of stoichiometry so as to be able to obtain the mass of the mass of the products and then the total mass of the products that is obtained in the reaction.
We have that in the question; 496. 5 grams of lead II nitrate reacts with potassium bromide is such a way that the lead II nitrate would be completely consumed in the reaction. This means that the lead II nitrate is the limiting reactant in the reaction.
Number of moles of the lead II nitrate = 496. 5 grams /331 g/mol
= 1.5 moles
If 1 mole of lead II nitrate produces 1 mole of lead II bromide
Mass of lead II bromide produced = 1.5 moles * 367 g/mol
= 550.5 g
If 1 mole of lead II nitrate produces 2 moles of potassium nitrate
1.5 moles of lead II nitrate produces 1.5 * 2 /1
= 3 moles of potassium nitrate
Mass of potassium nitrate = 3 moles * 101.1
= 303.3 g
Total mass produced = 550.5 g + 303.3 g
= 853.8 g
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What neutral element has the electron configuration described by the Aufbau diagram above.
Answers
Answer:
Aluminium.
Explanation:
The above electronic configuration can be written in a simplified form as shown below:
1s² 2s²2p⁶ 3s²3p¹
Next, we shall determine the number of electrons in the atom of the element as follow:
Number electron = 2 + 2 + 6 + 2 + 1
Number of electron = 13
Next, we shall determine the number of protons.
Since the element is in its neutral state,
The number of electrons and protons are equal i.e
Proton = Electron
Number of electron = 13
Proton = Electron = 13
Proton = 13
Next, we shall determine the atomic number of the element.
The atomic number of an element is simply the number of protons in the atom of the element i.e
Atomic number = proton number
Proton = 13
Atomic number = 13
Comparing the atomic number of the element with those in the periodic table, the element with the above electronic configuration is aluminium since no two elements have the same atomic number.
How much potassium nitrate could be dissolved into 2 L of water
Answers
Answer:
640 grams
Explanation:
look up Solubility table in wikipedia for potassium nitrate (KNO3)
32 grams of potassium nitrate (KNO3) water solubility at 20 degrees celsius (room temperature) can be dissolved in 100 milliliters (0.1 L) of water.
2 liters = 2000 milliliters
32 grams / 100 milliliters = x grams / 2000 milliliters
cross-multiply
100 * x = 32 * 2000
x = (32 * 2000) / 100
x ≈ 640 grams
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