Answer:
YESBSJSKSSKEKEJRJRJER
By which method is heat transferred in a microwave oven?
Conduction
Convection
Evaporation
Radiation
Answer:
the answer is radiation.
because the microwave is a form of radiation.
give me brainlyest if this was helpful to you otherwise dont.
Answer: D
Explanation:
Question 4 of 8
What can cause an object to move?
A. Balanced forces
B. Unbalanced forces
C. Inertia
D. A reference point
SUER
Answer:
unbalanced forces can cause an object to move.
Answer:
Unbalanced Forces
Explanation:
An aerosol can contains gas under a pressure of 2.0 atm at 20°C. Directions on
the can say that the can should be kept at less than 65°C. What would the
pressure in the can be at 65 °C?
Answer:
Explanation:
The volume is the same in both cases so the formula is
P1/T1 = P2/T2
T1 = 20 + 273 = 293 You have to convert Celcius to degrees Kelvin.
T2 = 65 + 273 = 338 degrees Kelvin
P1 = 2.0 atmospheres.
2.0 / 293 = P2/ 338
2*338 / 293 = P2
P2 = 676 / 293
P2 = 2.31 atmospheres
Calculate the nuclear binding energy per nucleon for cobalt-59, the only stable isotope of cobalt. The mass of cobalt-59 is 58.933198 amu. (The mass of 11H is 1.00783 amu, and the mass of a neutron is 1.00866 amu.)
Answer:
8.54 * 10^15 J
Explanation:
For Co-59
Protons- 27
Neutrons- 32
total calculated mass of protons = 27 * 1.00783 amu = 27.211 amu
total calculated mass of neutrons = 32 * 1.00866 amu =37.320 amu
Total calculated mass of nucleons = 27.211 amu + 37.320 amu = 64.531 amu
Mass defect = 64.531 amu - 58.933198 amu = 5.5978 amu
Binding energy = E=(Δm)c^2
Δm= mass defect
c= speed of light
E= 5.5978 amu (3.0 *10^8)^2
E= 5.03 * 10^17 J
Binding energy per nucleon = Binding energy/ total number of nucleons
= 5.03 * 10^17 J/ 59 = 8.54 * 10^15 J
what are the two components present in the colloid
Answer:
the two components in colloid are dispersed phase and dispersing medium
I hope this helps
Where is ionization energy highest on the periodic table?
What type of gases would be in the top right?
Ionization levels are most highest on the top right side of the Periodic Table. The type of gases that would be in the top right are noble gases, like helium, and other common noble gases.
Hope this answer helps you!
A sample of the igneous intrusion within the outcrop has 1682 Potassium-40 atoms, and 318 Argon-40 atoms. How old is the igneous intrusion
Answer: the igneous intrusion is 325 million years old
Explanation:
In the sample of the igneous intrusion
Number of Potassium-40 atoms (parent atom) = 1682
Number of Argon-40 atoms (daughter atom) = 318
Half-life of the Potassium40- Argon40 radioactive pair = 1.3 billion years = 1.3 × 10⁹ years
We now want to know the absolute age of the igneous intrusion.
At t = 0
i.e. when the igneous intrusion took place there will be no daughter atom (Ar-40).
So the number of parent (K-40) will be 1682 + 318 = 2000 atoms
Total number of atoms = parent + daughter = 2000 + 0 = 2000
Now after a given time
Number of Parent atom (K-40) = 1682
Number of Daughter atom (Ar-40) = 318
percent of parent atom (K-40)
= (Number of parent atom / total number of atoms) × 100
= (1682/2000) × 100
= 84.1 %
percentage of daughter atom (Ar-40) = 100 - % of K-40 atoms
= 100 – 84.1
= 15.9 %
Now from the table of “decay parameters for all radioactive decay pairs” which is uploaded along this answer
When Parent atom = 84.1 % and daughter atom = 15.9 %
then Age is given as 0.250T_1/2
THEREFORE age of the igneous intrusion
= 0.250 × 1.3 × 10⁹ years
= 0.325 × 10⁹ years
= 325 million years.
SO the igneous intrusion is 325 million years old
"the tamil naducoast recives winter rainfall "why?
Answer:
GDSSHCVJDJD
Explanation:
Which element is most likely to form a negative 2 ion? a Oxygen b Magnesium c Beryllium d Nitrogen
Answer:
a
Explanation:
Jack was playing with a toy car and a track that records velocity over time using sensors and it generated the graph below:
At which points on the graph is the car showing acceleration?
Group of answer choices
Sections a, c, and d
Sections a, b, c, and d
Sections a and d
Section a only
Answer:
a,c, and d
Explanation:
if velocity is not a flat line, that means there is acceleration, whether it is positive or negative acceleration.
Complete and balance each of the following equations for acid-base reactions.
HC2H3O2(aq)+NaOH(aq)→
Answer:
HC2H3O2 + NaOH = H2O + NaC2H3O2 - Chemical Equation Balancer.
Answer:
please check the image :)
In a chemical reaction, what happens to the total number of each type of atom?
Answer:
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
Stoichiometry must be multiplied by the number that is printed on the element's foot in order to determine how many atoms of a certain element there are in a given molecule. Therefore, the quantity of atoms inside a reaction doesn't change.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms have a central nucleus and electrons that move in a fixed orbit around it. Protons and neutrons are found in the nucleus. Electron has -1 charge while proton has +1 charge.
The combined mass of all of the components involved in a chemical process stays constant. Additionally, the quantity of atoms inside a reaction doesn't change. Chemical reactions cannot produce or destroy mass.
Therefore, the quantity of atoms inside a reaction doesn't change.
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) If 1 vitamin C tablet weighs 475 mg how much vitamin C is in that 1 tablet based on your
calculations?
Answer:
Amount = 0.0027 mol
Explanation:
The molecular formula of vitamin C is: C₆H₈O₆. Therefore, its molar mass will be:
Molar Mass = 6(Mass of carbon) + 8(Mass of Hydrogen) + 6 (Mass of Oxygen)
Molar Mass = 6(12 g/mol) + 8(1 g/mol) + 6(16 g/mol)
Molar Mass = 176 g/mol
Molar Mass = 176000 mg/mol
Now, for the amount of Vitamin C in 1 tablet
Amount = Mass of Tablet/Molar Mass
Amount = (475 mg)/(176000 mg/mol)
Amount = 0.0027 mol
Without SALT or SUGAR, does the water conduct electricity?
Suppose 4.0 g of hydrogen reacts completely with 32.0 g of oxygen to form one product what is the mass of the product?
Answer: The mass of product, [tex]H_2O[/tex] is, 36.0 grams.
Explanation : Given,
Mass of [tex]H_2[/tex] = 4.0 g
Mass of [tex]O_2[/tex] = 32.0 g
Molar mass of [tex]H_2[/tex] = 2 g/mol
Molar mass of [tex]O_2[/tex] = 32 g/mol
First we have to calculate the moles of [tex]H_2[/tex] and [tex]O_2[/tex].
[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]
[tex]\text{Moles of }H_2=\frac{4.0g}{2g/mol}=2.0mol[/tex]
and,
[tex]\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}[/tex]
[tex]\text{Moles of }O_2=\frac{32.0g}{32g/mol}=1.0mol[/tex]
Now we have to calculate the limiting and excess reagent.
The balanced chemical equation is:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
From the balanced reaction we conclude that
2 mole of [tex]H_2[/tex] react with 1 mole of [tex]O_2[/tex]
From this we conclude that, there is no limiting and excess reagent.
Now we have to calculate the moles of [tex]H_2O[/tex]
From the reaction, we conclude that
2 moles of [tex]H_2[/tex] react to give 2 moles of [tex]H_2O[/tex]
Now we have to calculate the mass of [tex]H_2O[/tex]
[tex]\text{ Mass of }H_2O=\text{ Moles of }H_2O\times \text{ Molar mass of }H_2O[/tex]
Molar mass of [tex]H_2O[/tex] = 18 g/mole
[tex]\text{ Mass of }H_2O=(2.0moles)\times (18g/mole)=36.0g[/tex]
Therefore, the mass of product, [tex]H_2O[/tex] is, 36.0 grams.
what does Ca stand for in chem?
Answer:
Calcium
Explanation:
Periodic table
The expression CaCO3 → CaO + CO2 is an example of a
Answer:carbin dioxide co^2
Explanation:
All sound begins with a vibration. Sound travels through the air to your ears which our brains interpret as sound. How are guitar strings like the particles in matter?
1.They are gold
2.They vibrate
3.They are a liquid
Pick One.
Which process squeezes layers of sediment together?
compaction
deposition
erosion
weathering
Answer:
The answer is compaction.
Explanation:
“Ozone protects us in the stratosphere but is a pollutant in the troposphere” true or false?
Answer:
true
Explanation:
Answer:
I would say the answer is FALSE because the ozone layer is the common term for the high concentration of ozone that is found in the stratosphere between 15 and 30km above the earth's surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun. So if the ozone layer is located at the stratosphere then the answer to your question is FALSE. Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.
Hope this helps, stay safe and have a great day! :)))))
40.00 grams of NaOH is added into distilled water and diluted with water to 1000mL of final volume. What is the final concentration of the NaOH
Answer:
The molar mass of NaOH is 40.00 g/mol.
The number of moles of NaOH is equal to the ratio of its mass to molar mass.
The number of moles of NaOH =
40 g/mol
40 g
=1,000 mol
The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.
M=
1 L
1 mol
=1 M
Explanation ;)
What is the molar mass of Mg(ClO4)2?
Answer:
223.21 g /mol
Explanation:
To find the molar mass (g/mol) of a substance, you have to add the amu's of all the elements together. First you have to determine how of element there are:
Mg=1, Cl=2, O=8. Now you multiply the amu of each element by the number of elements in the compound. Then add them together. The amu of an element and its molar mass are the same.
1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol) = 223.31 g/mol
223.31 g/mol is the molar mass of the given compound. The molar mass of a material is a bulk attribute rather than a molecular one.
The ratio among the mass with the quantity of a substance (measured in mole) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The compound's molar mass represents an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average as well as a function of the relative distribution of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.
Molar mass=1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol)
= 223.31 g/mol
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Which of the following is the correct formula used for calculating Speed?
Speed = distance / time
Speed = time / distance
Speed = mass / time
Answer:
A- Speed = distance/time
Explanation:
Would make sense and that's what I remember
Which is the correct name for P205?
O phosphorus dioxide
O phosphorus pentoxide
diphosphorus pentoxidev
diphosphorus hexaoxide
Answer:
Diphosphorus Pentaoxide
Explanation:
We have 2 atoms of Phosphorus and 5 atoms of Oxygen. It is a covalent bond.
2 is Di
5 is penta
Diphosphorus Pentaoxide
Answer:
C. Diphosphorus Pentaoxide
Explanation:
Describe what type of electron transfer happens between these two atoms.
Answer:
Magnesium loses it's two electrons and Oxygen gains two electrons. Magnesium is now a cation and Oxygen is now an anion. Both become stable.
Explanation:
The type of electron transfer which happens between the Mg and O atom is a complete transfer of electrons from the Mg atom to the O atom in an ionic bond.
As we know, Ionic bonding is a type of chemical bonding characterized by the complete transfer of electrons from one atom to the other.The most electropositive electron usually is usually the donor while the most electronegative elements is the acceptor.
As evident in the case above;
Mg, which is the electropositive element with 2 Valence electrons loses its Valence electrons to become Mg²+.O, which is the electronegative element with 6 Valence electrons, and consequently, only needs 2 electrons to complete it's octet.Ultimately, an ionic bond is formed between the Mg and O atoms.
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PLEASE HELP ME
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question.
Check all that apply.
H2(g)+12O2(g)→H2O(g)
Li(s)+12F2(g)→LiF(s)
2Li(s)+F2(g)→2LiF(s)
Li(s)+12F2(l)→LiF(s)
2H2(g)+O2(g)→2H2O(g)
H2O2(g)→12O2(g)+H2O(g)
Answer:
Explanation:
Li(s)+1/2 F₂(g)→LiF(s)
In this reaction one mole of product is formed from gaseous state of reactants . So this reaction will represent the reaction for which ΔH∘rxn equals to ΔH∘f .
In other reaction one mole is not produced if we balance the reaction. The reactant must be in gaseous state . ΔH∘f . represents heat of formation . ΔH∘rxn represents heat of reaction .
A fireworks designer is planning a red-, white-, and blue-themed finale for her fireworks display. She is also planning a fountain effect. Describe the chemicals she will need and how each will produce the desired effect.
Answer:
strontium salts, lithium salts, lithium carbonate, Li2 CO3 = red, whitehot metal, such as magnesium or aluminum, barium oxide, BaO = white, copper compounds + chlorine producer, copper acetoarsenite (Paris Green), Cu3 As2 O3 Cu(C2 H3 O2 )2 = blue. We will need a metal chemical, so that when it is heated it will produce the incandescent to make the fountain effect.
Explanation:
^^
Soil is an essential component of the earth's crust. It enabled life to exist and
provides the services necessary for human survival. What is the effect of soil
erosion? What will you do to protect the community?
Answer:
The consequences of soil erosion go beyond the loss of fertile land. It has contributed to increased runoff and sedimentation in streams and rivers, clogging these waters and causing declines in fish and other animals.
We can protect the community from soil erosion by -:
Maintaining a good, perennial cover for plants. From mulching. Planting a crop for coverExplanation:
SOIL EROSION -: The soil erosion mechanism is both natural and man-made. In nature, this refers to the removal of the top layer of soil caused by wind and water, while human activity may increase exposure to these elements.
MAJOR EFFECTS OF SOIL EROSION -:
Pollution and Low Water Quality -: Sedimentation is created by gradual soil erosion, a process by which rocks and minerals in the soil are separated from the soil and deposited elsewhere, often in streams and rivers. Soil contaminants, such as fertilizers and pest control agents, often settle in the streams and rivers to protect crops. Water contaminants contribute to low water quality, including drinking water quality, if the contaminants are not removed prior to ingestion. As sunlight can get through the sediment, sedimentation also leads to the excessive growth of algae. According to the World Wildlife Fund, high levels of algae drain too much oxygen from the water, resulting in the mortality of marine species and reduced fish stocks.Structural Issues and Mudslides -: Soil erosion contributes to mudslides, impacting the stability of buildings and roadways and their structural integrity. Mudslides affect not only soil-supported structures, but also buildings and roads that are in the path of slides. Mudslides occur when, as a result of the intensity and energy of heavy rainfall, fine sand , clay, silt, organic matter and soil spill off the sides of hills and slopes. According to Envirothon, a program of the National Conservation Foundation and North America's largest high school environmental education competition, this runoff happens rapidly, because there is not enough time for the surface to reabsorb or catch the eroding soil.Flooding and Deforestation -: Deforestation erodes soil — the removal of trees to create space for towns and agriculture. Trees help to maintain soil in place, so winds and rains drive the loose soil and rocks to streams and rivers when they are uprooted, resulting again in unnecessary sedimentation. The thick layers of sediment keep streams and rivers from flowing smoothly, ultimately contributing to flooding. Excess water, especially during rainy seasons and when the snow melts, gets trapped by the sediment and has nowhere to go except back on land.The Deterioration of Soil -: Soil nutrient depletion is often the result of poorly performed cultivation and cultivation practices that contribute to soil erosion. For natural vegetation and agricultural purposes, excessive irrigation and obsolete tilling practices decrease the amount of nutrients in the soil and make it less fertile.PROTECTION OF COMMUNITY FROM SOIL EROSION -
Maintaining a good, perennial cover for plants -: Your perennial garden's care and upkeep need not be difficult or overwhelming. A blend of certain simple horticultural values with common sense and a good eye is a great part of good gardening.MULCHING -: The amount of water that evaporates from your soil will be reduced by mulch, greatly reducing the need to water the plants. By breaking up clay and permitting better movement of water and air through the soil. Mulch supplements sandy soil with nutrients and enhances its ability to retain water. PLANTING A CROP FOR COVER -: Winter rye in vegetable gardens, for instance. This includes annual grasses, small grains , legumes and other forms of vegetation that have been planted to provide temporary vegetative cover. Cover crops are also often tilled as a 'green manure' crop under serving.Some of the effects of erosion on the environment includes :
Washing away of soil nutrients Pollution of the waterways Blockage of drainages degradation of soilWays to protect the earth from soil erosion includes
planting of cover crops Mulching use of crush rocks on certain areasSoli erosion is the washing away of the top soil of the earth's crust which can be caused by the movement of wind , water or ice over the surface of the earth crust. this action leads to the degradation of the soil
Soli erosion leads to the washing away of soil nutrients and the pollution of waterways because of the deposition of soil particles into the waterways. the washed away soil can also block the drainages leading to a bigger problem ( flooding ).
Some of the steps that would help protect the soil from the effects of soil erosion are planting of cover crops , mulching and use of crush rocks on areas that are used most frequently to prevent the washing away of the soil.
Hence we can conclude that the effects of soil erosion are Washing away of soil nutrients , Pollution of the waterways, Blockage of drainages while ways to protect the earth from erosion are ;planting of cover crops, Mulching, use of crush rocks on certain areas
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1. Calculate the number of grams of solute required for the preparation of 1.5L of 0.32M NaHCO3 (MW=84)
V1 X C1 = V2 X C2
Answer:
40.32 grams of solute required for the preparation of 1.5L of 0.32M NaHCO₃
Explanation:
Molar concentration or molarity is a measure of the concentration of a solute in a solution. Molarity is defined as the number of moles of solute present in one liter of solution.
Molarity is calculated by the expression:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
Molarity: 0.32 Mnumber of moles of solute: ?volume: 1.5 LReplacing:
[tex]0.32 M=\frac{number of moles of solute}{1.5 L}[/tex]
Solving:
number of moles of solute= 0.32 M* 1.5 L
number of moles of solute= 0.48 moles
Being the molar weight of NaHCO₃ equal to 84 g / mole, the following rule of three can be applied: if there are 84 grams in 1 mole, how much mass is there in 0.48 moles?
[tex]mass=\frac{0.48 moles*84 grams}{1 mole}[/tex]
mass= 40.32 grams
40.32 grams of solute required for the preparation of 1.5L of 0.32M NaHCO₃
Five characteristics of gas,solid and liquid(make brainest)
Answer:
1. Gases have neither definite shape nor definite volume. They expand to the size of their container.
2. Gases are fluid, and flow easily.
3. Gases have low density, unless compressed. ...
4. Gases diffuse (mix and spread out) and effuse (travel through small holes).
Explanation: