Answer:
explanation:
1
Which kind of investigations never include a hypothesis?
experimental
systemic
descriptive
comparative
Answer:
descriptive
Explanation:
Descriptive investigations only involve factual information. It doesn't answer questions for when, how, or why an event happens.
Define the atomic mass unit and average atomic mass
Answer:
Atomic mass unit: a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg
average atomic mass: The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).
Explanation:
A student has a solution of 2.0 M MgSO4. What volume (in mL) of the original solution is needed to make 100 mL of 0.40 M MgSO4?
A) 20
B) 50
C) 200
D) 500
1. What happens when you add buttermilk (an acid) to baking soda (a base) in a mixing bowl does the pH increases or decreases or neutral.
2. A scientist is looking for a solution that is neither acidic nor basic. Which pH would identify a solution as neither acidic nor basic?
3. How self-raising flour helps cake rise?
4. Why do bases make good household cleaners?
5. When you vomit, you feel a burning sensation in your mouth and throat. Why do you think this happens?
Answer:
Explanation:
1)This reaction is an acid base reaction. Baking soda is made up of sodium bicarbonate has it's PH above 7,while the Buttermilk contains some fatty acids with it's PH below 7, neutralization would occur when mixed together, and the pH of the mixture must be close to 7 which is neutral pH.
2) PH of 7(Neutral PH)
3)Self-raising flour has baking powder as one of its constituents. It also cotains cream of tartar, bicarbonate soda as well as calcium aluminium phosphate, the carbon dioxide from Bicarbonate of soda is released when reaction with acid takes place, then the Cream of tartar turns to tartaric acid when it is mosturized , then the reaction between them will produce bubbles of carbon dioxide in the cake, causing the cake to rise.
4)It makes a good household cleaner because it react with organic chemicals such as oil or grease then break them down like without attacking the metals that is attached to them.Bases contain particles called hydroxide ions. The higher the amount of hydroxide ions present in a base , the stronger it is.
5) The harsh acid or bike in the stomach creates a burning sensation in the back of your throat which irritate the food pipe line. Ifthe acid reflux is severe, it's reffered to as gastroesophageal reflux
Select the ion. HC 2H 3O 2, Mg, H +
Answer:
H+
Explanation:
H+ = hydronium ion
- Hope that helps! Please let me know if you need further explanation.
Sociable weavers are a species of bird found in Africa. All males of a colony work together to build a large nest that can house several hundred birds. This is an example of .
Typically, peregrine falcons hunt medium-sized birds, but they will also eat small mammals, reptiles, and insects. This is an example of .
Male deer, called bucks, head-butt each other to defend their breeding territory and female mates. This is an example of .
Answer:
cooperation for the first, then predation, the last is competition.
Explanation:
i got it right. hope it helps!
Answer:
cooperation, predation, competition :)
Explanation:
If this butane lighter uses 15.0 grams of butane, how many grams of carbon dioxide does it produce at 95% efficiency?
Answer: 43.5g of carbon dioxide it produce at 95% efficiency
Explanation:
[tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]
To calculate the moles, we use the equation:
moles of butane =[tex]\frac{\text {given mass}}{\text {molar mass}}=\frac{15.0g}{58g/mol}=0.26moles[/tex]
According to stoichiometry:
2 moles of butane gives = 8 moles of carbon dioxide
Thus 0.26 moles of butane gives= [tex]\frac{8}{2}\times 0.26=1.04[/tex] moles of carbon dioxide
Mass of [tex]CO_2[/tex] produced=[tex]moles\times {\text {Molar mass}}=1.04\times 44=45.8g[/tex]
As yield of the reaction is 95%, the amount of [tex]CO_2[/tex] produced =[tex]\frac{95}{100}\times 45.8=43.5g[/tex]
Thus 43.5g of carbon dioxide it produce at 95% efficiency
I need help assap!!!!!
Answer:
1. 2h(2) + 1O(2) -> H(2)O
2 1CH(4) + 2O(2) -> 1CO(2) + 2H(2)O
3. 1N(2) + 3H(2) -> 2NH(3)
4. 2P + 5O(2) -> 2P(2)O(5)
LeAnn knows the speed of an airplane but she wants to find the velocity. What does she need to determine to find velocity?
A.
The time it takes the airplane to move between two points.
B. The acceleration needed to get to its speed.
C. The force of the airplane's engine.
D.
The direction the airplane is flying.
To determine the velocity the she need to know the time it takes the airplane to move between two points.
What is the difference between speed and velocity?Speed is a scalar quantity means it depends on magnitude value only and velocity is a vector quantity means with magnitute it also depends on the direction also.
Velocity is define as the distance travelled by any object in the given time interval and it is represented as:
v = dx/dt
Hence the time it takes the airplane to move between two points is required.
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What is the empirical formula for P4O10?
Answer: P2O5
Explanation: You divide both subscripts by 2 to get the empirical formula.
Answer:
Formula of P4O10 is P2O5.
Explanation:
WE GET IT BY DIVIDING BOTH SUBSCRIPTS BY 2.
Based on the weather map, what might the upcoming weather be like in Chicago?
1.Warm, dry, clear skies
2.Warm, humid, possible thunderstorms
3.Cold, dry, clear skies
4.Cool, humid, possible thunderstorms
Answer:
Warm, dry, clear skies
Explanation:
The sun is responsible for all weather variations that take place. because the sun is a massive sphere of heated gases and has a very high temperature. It is the earth's primary source of heat and light. Here the weather is Warm, dry, clear skies. The correct option is 1.
What is weather?The weather of a location refers to the average conditions of the atmosphere there in relation to variables like humidity, temperature, wind speed, rainfall, etc. Cloudy, sunny, wet, stormy, or clear weather are all possible. It is a characteristic of the natural process that keeps the atmosphere in a state of equilibrium.
Meteorologists record the weather every day, and these records are kept for a very long time. These records are used to determine the weather's pattern. The climate of a place is defined as its long-term average weather pattern.
Severe weather is defined as weather that is extreme or intense enough to result in damage to property or fatalities.
Thus the correct option is 1.
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A saturated solution of lead(II) nitrate was made at 50 °C using 100 g of water, and this was then allowed to cool to 30 °C. Predict what would happen as the solution cooled?
Answer: D) The solubility would decrease and some of the lead (II) nitrate would precipitate out.
Sort the images based on whether there’s a force of attraction or repulsion between the magnets shown.
Answer: Here is the answer
Explanation: Have a good day!
A substance or thing that creates a magnetic field is called a magnet. The sorting can be done as below in the image.
What is magnet?A substance or thing that creates a magnetic field is called a magnet. The most noteworthy characteristic of a magnet—a force that pulls against other ferromagnetic elements, such as metals like steel, iron, cobalt, and nickel, etc.—as well as the ability to attract or repel other magnets—is caused by this invisible magnetic field.
An object constructed of a substance that has been magnetised and produces its own continuous magnetic field is referred to as a permanent magnet. A common example comprises a refrigerator magnetism used to keep notes on the door of the refrigerator. Ferrimagnetic materials are those that can be magnetised and are also extremely drawn to a magnet. The sorting can be done as below in the image.
Therefore, the sorting can be done as below in the image.
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What are some examples of forced convection
Answer: Using a fan on a hot summer day. Explanation: the sweat that our body produces is for effective heat transfer. ...
Radiators in fridges, acs and automobiles. ...
Instant water heating geysers or any other geysers.
Explanation:
1. What happens when you add buttermilk (an acid) to baking soda (a base) in a mixing bowl does the pH increases or decreases or neutral.
2. A scientist is looking for a solution that is neither acidic nor basic. Which pH would identify a solution as neither acidic nor basic?
3. How self-raising flour helps cake rise?
4. Why do bases make good household cleaners?
5. When you vomit, you feel a burning sensation in your mouth and throat. Why do you think this happens?
Answer:
1) acid + base = salt + water its neutralization reaction
2)A solution that is neither acidic nor basic is neutral and has a pH of 7. The pH scale, which ranges from 0 to 14, indicates how acidic or basic a substance is. A substance that has a pH below 7 is and acid and a substance with a pH above 7 is a base.
3)Self raising flour rises due to the baking powder inside.
Self raising flour is different from normal flour as it has baking powder mixed inside already. Baking powder is usually made up of a chemical called sodium carbonate, when mixed with water this will releases the gas carbon dioxide. So when you mix a cake together and pour it into a tin, the heat plus the water in the mixture will cause the baking powder to release small amounts of carbon dioxide which produces bubbles. These bubbles try to rise up and so the mixture starts to rise with all the tiny bubbles. The reason the air does not escape is because the heat from the oven is making the cake solid. Once is it solid the carbon dioxide slowly leaves the bread or cake, so don’t worry you’re not eating loads of carbon dioxide
4) They react/break down organic chemicals like oil/grease without attacking the metals that they are attached too which is better than acids which do react with metals as well
5) it is because when you vomit due to acidity in stomach
the harsh acid creates a burning sensation in the back of your throat and chest, and can also give you a sour or bitter taste in your throat and mouth
THANK YOU
PLS SUPPORT ME
AND I HAVE DONE SOME RESEARCH ON THE ANSWERS SO
IF THE ANSWER IS WRONG PLEASE FORGIVE ME
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What is the pressure, in KPa, of 2.00 mol of He in a 10.5 L container at 27.0 oC?
Answer:
N= PV/RT (temperature in kelvin); ( r is .0821 when pressure is in atm & r is 8.314 when pressure is in Kpa)
2.00 = P x 10.0/ .0821 x 300
after solving i got 4.926 atm
Which formula can be used to calculate the theoretical yield?
Actual yield + percent yield
Amount of reactants + amount of products
(Actual yield ÷ percent yield) × 100
(Amount of reactant ÷ amount of product) × 100
Answer:
Option C, (Actual yield ÷ percent yield) × 100
Explanation:
Theoretical yield is defined as the total amount of product formed for given reactants in a chemical reaction. It is an ideal case which assumes no exceptions or wastage.
The mathematical relation between the actual yield, percent yield and theoretical yield is as follows -
[tex]P.Y. = \frac{M_{A.Y.}}{M_{T.Y.}} * 100[/tex]
Where
P.Y. represents the percent yield a
M A.Y. represents the mass obtained from actual yield
M T.Y. represents the mass obtained from theoretical yield
Hence, if we rearrange the formula, we get -
[tex]M_{T.Y.} = \frac{M_{A.Y.}}{P.Y.} * 100[/tex]
Hence, option C is correct
Answer:
C
Explanation:
Just took the test :)
2KOH+H2SO4=k2SO4+2H2O Is a balanced equation, displaying the combination of potassium hydroxide with sulfuric acid increase potassium sulfate and water. According to this chemical equation, how many moles of potassium hydroxide will be needed to make 4 moles of K2SO4?
Answer:
The number of moles of potassium hydroxide, KOH required to make 4 moles of K₂SO₄ is 8 moles of KOH
Explanation:
2KOH + H₂SO₄ → K₂SO₄ + 2H₂O
From the above reaction, we have 2 moles of KOH combining with 1 mole of H₂SO₄ to produce 1 mole of K₂SO₄ and 2 moles of H₂O.
Therefore the number of moles of potassium hydroxide that will be needed to make 4 moles of K₂SO₄ is;
8KOH + 4H₂SO₄ → 4K₂SO₄ + 8H₂O
8 moles of KOH is required to make 4 moles of K₂SO₄.
Final answer:
To make 4 moles of K2SO4, 8 moles of KOH are needed.
Explanation:
To find the number of moles of potassium hydroxide (KOH) needed to make 4 moles of K2SO4, we need to use the balanced chemical equation:
2KOH + H2SO4 → K2SO4 + 2H2O
From the equation, we can see that 2 moles of KOH react with 1 mole of H2SO4 to form 1 mole of K2SO4. Therefore, the mole ratio is 2:1.
Since we want to make 4 moles of K2SO4, we can set up the following proportion:
(2 moles KOH) / (1 mole H2SO4) = (x moles KOH) / (4 moles K2SO4)
Cross multiplying gives:
2 moles KOH = 4 moles K2SO4 * 2 moles KOH / 1 mole H2SO4 = 8 moles KOH
Therefore, 8 moles of KOH are needed to make 4 moles of K2SO4.
2 Points
When light waves strike a blue object, what happens to the light waves of all
colors except blue?
O
O
A. They are diffracted.
B. They are polarized.
C. They are absorbed.
D. They are reflected.
SUBMIT
Answer:
All colors except blue are absorbed while blue is reflected. We
only see blue
Explanation:
When you go and see something blue as the sky, all of the colors are absorbed except blue. That is how we see colors
A piece of iron metal is heated to 155 degrees C and placed into a calorimeter that contains 50.0 mL of water at 18.7 degrees C. The temperature of the water rises to 26.4 degrees C. The specific heat of iron of iron is 0.444 J/g degrees C. Assuming no loss of heat to the surroundings, what is the mass of the iron?
A-26.2 g
B-28.3 g
C-29.2 g
D-28.2 g
Answer:
D = 28.2g
Explanation:
Initial temperature of metal (T1) = 155°C
Initial Temperature of calorimeter (T2) = 18.7°C
Final temperature of solution (T3) = 26.4°C
Specific heat capacity of water (C2) = 4.184J/g°C
Specific heat capacity of metal (C1) = 0.444J/g°C
Volume of water = 50.0mL
Assuming no heat loss
Heat energy lost by metal = heat energy gain by water + calorimeter
Heat energy (Q) = MC∇T
M = mass
C = specific heat capacity
∇T = change in temperature
Mass of metal = M1
Mass of water = M2
Density = mass / volume
Mass = density * volume
Density of water = 1g/mL
Mass(M2) = 1 * 50
Mass = 50g
Heat loss by the metal = heat gain by water + calorimeter
M1C1(T1 - T3) = M2C2(T3 - T2)
M1 * 0.444 * (155 - 26.4) = 50 * 4.184 * (26.4 - 18.7)
0.444M1 * 128.6 = 209.2 * 7.7
57.0984M1 = 1610.84
M1 = 1610.84 / 57.0984
M1 = 28.21g
The mass of the metal is 28.21g
Answer: 1610 j
Explanation:
On ck-12
Why do you think knowing enthalpy of reaction might be useful?
Answer:
It allows scientists to predict the temperature change during a reaction.
Explanation:
Answer:
It allows scientists to predict the temperature change during a reaction.
It allows scientists to determine how much of a reactant is necessary to produce a certain amount of energy.
It allows scientists to predict whether a reaction might produce dangerous amounts of heat.
Explanation:
balance Cr2O3+Mg -->Cr + MgO
Balancing means there are equal amount of molecules on each side, both reactant and products. This is a method I like to do.
Under, I count how many molecules are in each side.
Cr2O3+Mg -->Cr + MgO
Cr: 2 1
O: 3 1
Mg: 1 1
Let's guess and make the number of oxygens equal on both sides.
Cr2O3+Mg -->Cr + 3MgO
Cr: 2 1
O: 3 3 EQUAL
Mg: 1 3
See what we did there? We multiplied the MgO on the products side by 3 so we can have 3 oxygens. Now let's multiply the Mg on the reactants by three so Mg AND O can be equal.
Cr2O3+3Mg -->Cr + 3 MgO
Cr: 2 1
O: 3 3 EQUAL
Mg: 3 3 EQUAL
Finally, we just need to multiply the loner Cr in the products side by two to make it equal for all elements.
Cr2O3+3Mg -->2Cr + 3 MgO
For the reaction of nitrogen gas and hydrogen gas to make methane below, what stresses would shift the equilibrium to the left toward the reactants? N2(g) + 3 H2(g) ⇌ 2 NH3(g) + Energy
Answer:
1) Adding more NH₃
2) Raising the temperature of the reaction
Explanation:
To answer the question, we are to note that the reaction is a reversible reaction, hence to shift the equilibrium to the left we would alter the equilibrium conditions as follows;
1) Adding more of the product NH₃ to the reaction at equilibrium
Increasing the quantity of products will force the concentration of the reactant product combination at equilibrium to readjust forming more of the reactant, because, for example, at equilibrium we have one mole of N₂ combining with 3 moles of H₂ forming 2 moles of NH₃. If the NH₃ is increased to 4 moles then there will be more H₂ and N₂ formed to regain equilibrium
2) Increasing the reaction temperature
It is also observed that the reaction produces energy, that the the energy of the product is less than those of the reactant. Therefore, to shift the equilibrium to the left, that is towards the reactants, we have to increase the temperature of the reaction so that there will be enough energy for the formation of the higher energy reactants.
Some scientists believe that comets originate from the...
Answer:
Scientists believe that comets are the debris left from the solar nebula which condensed to form the Sun and planets in our solar system. Most comets are thought to originate in a huge cloud called the Oort Cloud. ... Comets follow a regular orbit around the Sun.
Hope this helps! :)
Explanation:
Answer:
In fact, if the estimated total mass of all asteroids was gathered into a single object, this object would be less than 1,500 kilometers across, less than half the diameter of our Moon. Kirkwood gaps: If you plot the radius of the orbits of the asteroids you do not get a smooth `bell-curve' shape.
Explanation:
How does water change the shape of Earth's surface?
Answer:
Water moving across the earth in streams and rivers pushes along soil and breaks down pieces of rock in a process called erosion. The moving water carries away rock and soil from some areas and deposits them in other areas, creating new landforms or changing the course of a stream or river.
Explanation:
Answer:
Water shapes Earth’s surface by wearing away soil and rock and through the movement of glaciers. Weathering through the action of water and frost or ice also changes the shape of Earth’s surface.
Explanation:
ASAP Ag2O(s) → 2Ag(s) + ½ O2(g) ΔH° = 31.05 kJ
Which statements concerning the reaction above are true?
(1) heat is released
(2) heat is absorbed
(3) reaction is exothermic
(4) reaction is endothermic
(5) products have higher enthalpy content than reactants
(6) reactants have higher enthalpy content than products
A) 1, 3, and 5
B) 1, 3, and 6
C) 2, 4, and 6
D) 2, 4, and 5
Answer: 2 4 5
Explanation:
How many liters of O2 will form at STP if 22.5 g H2O2 react?
Answer: 7.41 L of O2
Explanation:
2H2O2(l) ----> 2H2O(l) + O2(g)
22.5 g H2O2 x __1 mol__ x __1 mol O2__ x __22.4 L__ = 7.41 L of O2
34.016 g 2 mol H2O2 1 mol O2
If the [H₃O⁺] of a solution is 1.7 x 10⁻³ M, what is the pH of the solution?
Answer:
The pH of the solution is 2.77
Explanation:
Data obtained from the question include:
Concentration of hydronium ion, [H₃O⁺] = 1.7 x 10⁻³ M
pH =?
The pH is define as the measure of concentration of Hydrogen ion [H⁺] or hydronium [H₃O⁺] in an acid or a base. Mathematically, it is expressed as:
pH = –Log [H₃O⁺]
With the above equation, the pH can be obtained as follow:
pH = –Log [H₃O⁺]
[H₃O⁺] = 1.7 x 10⁻³ M
pH = –Log 1.7 x 10⁻³ M
pH = 2.77
Therefore, the pH of the solution is 2.77
which compound has the stronger bonds
Answer:
Compound B would have stronger bonds because the reaction needs and absorbs heat to reach the status of the product.
Explanation:
Which is a series circuit and a parallel circuit
Explanation:
A is a series circuit
B is parallel circuit
Answer:
A. series circuit
B. parallel circuit