Answer: Energy is transferred from reactants to products .
Explanation: Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Reactants are your starting point, and products are your result.
How does blood flow from a person's leg back to the person's heart?
A Gravity pushes the blood upward.
B Lungs pull the blood upward.
C Contracting leg muscles push the blood upward.
D Contracting heart muscles pull the blood upward.
two students noted that the acceleration of a car was =40 k/m squared . the fiesta student , "that can't be right . you can't have a negativo acceleration ."second student said , "that can't be right , you can't have seconds squared .
what would you say to each student to help them More better understand how acceleration Is described
PLEASE ANSWER ASAP,FOR MY SCIENCE TEST
Answer:
First one: Yes, It can be negative.
Explanation:
First one: The reason you can have negative acceleration is that acceleration can slow down, or decelerate, causing the negative acceleration.
which of the following instruments id used to describe how much matter is an object
Answer:
Mass measures the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg). Volume measures the amount of space that a substance or an object takes up.
Hope it help
the half reaction of an oxidation-reduction shows that iron gains electrons. what does this electron gain mean for iron?
a. it’s neutralized
b. it’s oxidized
c. it has dissolved
d. it’s reduced
e. it has precipitated
Answer:
d. it’s reduced
Explanation:
An oxidation-reduction reaction, commonly known as REDOX reaction is a type of reaction that involves the transfer of electrons from one atom to another characterized by a change in oxidation number. The atom that loses electrons is said to be OXIDIZED while the atom that gains electrons is said to be REDUCED.
Therefore, in this question describing the half reaction of an oxidation reduction to show that iron atom (Fe) gains electrons. This indicates that the IRON atom is being REDUCED because it's oxidation number will reduce after gaining electrons.
How many atoms of Carbon are in 4 C3H5012?(10 points)
Answer:
In carbon there are 12 atoms.
Explanation:
You need to multiply the coefficient, in this case the coefficient is a 4 to Carbon's (C) Subscript which is 3, to find out how many atoms it has. (4)(3)=12
How many moles of NaCl are in a 1 kg salt packet? Write the answer to one decimal place.
1Kg = 1000g
the molar mass of NaCl = 58.44 g/mol
number of moles = Mass / Molar mass
n = 1000g ÷ (58.44 g/mol)
n = 17.1115 mol
since you want the answer in one decimal place
then number of moles = 17.1 moles
How does heat transfer work?
Answer:
Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules
Explanation:
ASAP!!!!! Just answer the reasoning and the story is there if you need it (probably do though)
15. Which of the following would be comprised of atoms?
O emotions
Olight
O paper
O sound
Answer:
Paper
Explanation:
This is because out of all of the above it is the only physical substance
How many moles are found in 6.63 x 10^23 ions of Ca ^+2
Answer:
a milllion moles
Explanation:
Convert into decimal number system
Answer:
Explanation:
I am sorry but please give detailed question
Answer:
Step 1 − Divide the decimal number to be converted by the value of the new base.
Step 2 − Get the remainder from Step 1 as the rightmost digit (least significant digit) of new base number.
Step 3 − Divide the quotient of the previous divide by the new base.
Step 4 − Record the remainder from Step 3 as the next digit (to the left) of the new base number.
Repeat Steps 3 and 4, getting remainders from right to left, until the quotient becomes zero in Step 3.
Explanation:
An organism can occupy more than one niche in an ecosystem
A) True
B) False
Answer T
Explanation:
The pressure of a gas in a tank is 3.20 ATM at 22.0°C if the temperature is increased to 60.0°C what will the new pressure in the tank be
Answer:
P₂ = 3.61 atm
Explanation:
Given data:
Initial pressure of tank = 3.20 atm
Initial temperature = 22.0°C
Final temperature = 60.0°C
Final pressure = ?
Solution:
Initial temperature = 22.0°C (22.0 +273 = 295 K)
Final temperature = 60.0°C (60 +273 = 333)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
3.20 atm / 295 K = P₂/333 K
P₂ = 3.20 atm × 333 K / 295 K
P₂ = 1065.6 atm. K /295 K
P₂ = 3.61 atm
Answer:
The answer is 3.61
Explanation:
reI did all the math and everything, the pressure is 3.61
Match each type of mass movement to its description.
the rapid downhill flow of a mixture of rock,
soil, and water
slump
mudflow
the slow downhill movement of rock and soil
creep
the rapid downhill movement of a mass of
rock, debris, or soil
landslide
a loosely connected mass of rock and soil
that moves a short distance
Answer: np
Explanation:
Correctly matched are :
landside - rapid movement of rock, debris, and soil. mudflow - mixture of rocks, soil, water. slump - loosely mass of rocks and soil.What is a landslide?A landslide is also called a land slip. It refers to several forms of mass wasting and may include a wide range of ground movements. They occur in a variety of environments characterize by gentle and steep slope gradients.
The mudflow is a mixture of rocks and soil along with water. While a creep is a slow downloads movement of rocks and soil.
Find out more information about the mass movement.
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pls this is my second time asking these questions, i'm sorry, but i really need help!!! 1. what happens to atoms when there is a chemical reaction? 2. what are the rules that have to be followed for atoms? 3. what do these rules mean for chemical reactions? sorry, chemistry isn’t really my best subject lol
Answer:
the atoms of the original substances gain, lose and even share their very own electrons. write the symbols of the elements that form the compound. Write down the valency, and lastly go over valencies. This is all I got so far. I hope this helps
Explanation:
Please I'm begging for help. I'll give you ALL MY POINTS. JUST PLEASE HELP.
Worksheet: Balancing Equations
Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3
2. C3H8 + O2 CO2 + H2O
3. P4 + O2 P2O3
4. KNO3 KNO2 + O2
5. O2 + CS2 CO2 + SO2
6. KClO3 KCl + O2
7. N2 + H2 NH3
8. NaF + Br2 NaBr + F2
9. Al + HCl H +AlCl3
10. WO3 + H2 W + H2O
Answer:
Explanation:
A Chemical Equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while Products are the new substances that are formed. The large numbers in front of some of the formulas are called Coefficients. These numbers are used to Balance the equation because chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be Equal because matter cannot be Created or Destroyed. When balancing equations, the only numbers that can be changed are Coefficients; remember that Subscripts must never be changed in order to balance an equation.
Q1) 4Al + 3O2 ---> 2Al2O3
Q2) C3H8 + 5O2 -----> 3CO2 + 4H20
Q3) P4 + 3O2 -----> 2P2O3
Q4) 2KNO3 -----> 2KNO2 + O2
Q5) 3O2 + CS2 ------> CO2 + 2SO2
Try the rest out and tell me did you understand it?
Why does the reaction proceed more quickly when the surface area is increased?
The reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
What is Collision theory?Collision theory states that for a chemical reaction to proceed, it should achieve these conditions-
Molecules/atoms must collideThe particles must collide in right orientationThe particles must collide with enough energyIncreasing the surface area increases the probability of effective collisions. It thus increases the probability of the three conditions being achieved and results into increase in the frequency of collision and thus increases the rate of reaction.
Therefore, the reaction proceed more quickly when the surface area is increased because the frequency of collision increases.
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The illustration above represents what concept?
A.) Natural selection
B.) Homologous structures
C.) Adaptation
D.) Variation
2.) A fossil that is characteristic of a particular span of geological time or a specific environment is called a(n):
A.) Index fossil
B.) Cast fossil
C.) Petrified fossil
D.) Mold fossil
3.) How is artificial selection different from natural selection? Select the best answer from the choices below.
A.) In artificial selection, animals. that are more likely to survive reproduce.
B.) In artificial selection, members of a species must complete to survive
C.) In natural selection, people impact. which traits are passed on
D.) In artificial selection, humans choose which organisms reproduce.
PLEASE HELP!!!
Answer:
3 Is D
Explanation:
What happens when an object
returns to its original shape-does it
still have elastic energy?
Answer:
Elastic potential energy is energy stored as a result of applying a force to deform an elastic object. The energy is stored until the force is removed and the object springs back to its original shape, doing work in the process. The deformation could involve compressing, stretching, or twisting the object.
Coral reef are threatened today mainly because
Answer: Pollution.
Explanation: Humans are polluting Earth's oceans with our toxic waste and plastic garbage. This trash kills the coral reefs that exist in said oceans.
Answer:
Really pollution because that includes a lot of things
Explanation:
Have a good day
How does the vacuole help the cell survive? (function)
Answer:
it stores water for the cell
A tub is filled to the brim with water.
If you were to completely submerge
your body in this tub, how much water
would overflow out of the tub?
The volume of water that would overflowed out of the tub is directly related to the volume of the object submerged on it. Thus it depends on the mass and density of the object.
What is Archimedes principle?The Greek mathematician and inventor Archimedes discovered the physical law of buoyancy, which states that any body completely or partially submerged in a fluid (gas or liquid) at rest is subject to an upward, or buoyant, force whose magnitude is equal to the weight of the fluid displaced by the body.
The volume of fluid that has been displaced is equal to the volume of an object that is completely submerged in the liquid or to the portion of the volume below the surface for an object that is only partially submerged.
The buoyant force's strength is equal to the weight of the fluid that has been dispersed. A body floating in a liquid or gas experiences an analogous buoyant force.
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Reyna is making a mixture of lithium chloride (LiCl)) and water (H2O). The lithium chloride completely dissolves in the water, LiCl (aq). What is the solvent?
Answer:
Water
Explanation:
The solvent that formed this mixture is the water. The solute is lithium chloride.
A solvent is the fluid medium which allows a solute to dissolve. A solute is a solid substance which is dispersed in the solventSince the solvent is the dissolving medium, it is stated in the problem that lithium chloride completely dissolves in the water.
Therefore, the water is the solvent.
A buffer solution is prepared by adding NaC2H202
to a solution of HC2H2O2 (acetic acid).
HC2H2O2(aq) = H+ (aq) + CH3O2 (aq)
What happens if HCl is added?
Shift to reactants(left)
Further explanationA buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solutions consist of weak acids and their salts.
A buffer solution of NaC2H202 and HC2H2O2 (acetic acid) is included in the acid buffer
So :
a slight addition of acid (H⁺) will be balanced by the conjugate base
the addition of a small base (OH⁻) will be balanced by the weak acid
With the addition of acid (H +), the equilibrium will shift to the left, in the formation of CH3COOH. The added acid will be neutralized by the conjugate base component (CH3COO−).
What causes liquid water to freeze?
Answer:
Loss of energy to a colder material. Ice forms at 32°F /0° C.
Explanation:
As water cools, the natural movement between the molecules slows until it changes to a solid state (just as it boils to gas if they become too active). This movement doesn't completely stop until the material hits "absolute zero" at -460°F /-273° C. (0° Kelvin).
That's about the temperature "in the shade" in outer space.
A more interesting question would be, "why does water expand when it freezes?" The H - two - O molecule forms a triangle (with the O in the middle).
As it cools, the angle formed by the two H's gets larger. At around 36°F /2° C , the shrinking space between molecules gets overwhelmed by the expanding size of each molecule.
So, for those last few degrees before freezing, the overall volume gets bigger instead of continuing to decrease.
That's what causes potholes in roads (water settles into cracks, then makes the crack larger as it freezes). It's what damages the eaves trough around your roof, breaks leaves down into topsoil and splits boulders in half.
If an exothermic reaction heats a calorimeter with a total mass of 10 grams from 20°c to 30°c what is the total enthalpy change for the reaction? assume that the specific heat capacity of the system is 2 j/g⋅k.
The total enthalpy change for the reaction is 200 J.
During an exothermic reaction, heat is released from the system which leads to an increase in its temperature.
The enthalpy change during an exothermic reaction is given by the equation,
Q= m × S × ΔT
Here, Q ⇒ Enthalpy change during a reaction
m ⇒ Mass of the substance
S ⇒ Specific Heat Capacity of the system
ΔT ⇒ Change in temperature of the system
On applying the given values in the above equation, we get the value of enthalpy as
Q= 10 x 2 x 10
= 200 J.
Hence, the total enthalpy change for the reaction is 200 J.
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HELP PLEASE 100 points!!!
Answer:
by the looks of it the answer you have is correct
Explanation:
Answer:
The answer B
.
Explanation:
I've tried looking it up but I can't find an answer. Please help with this question.
Answer:
Hydrocarbons
Explanation:
Answer:
Monomers
Explanation:
4 grams of hydrogen and 32 grams of oxygen will combine to form:
A: 36 grams
B: 28 grams of hydroxide
C: 32 grams of Oxygen
D: 36 grams of deuterium
Based on the mole ratio of the reaction, 4 grams of hydrogen and 32 grams of oxygen will combine to form 36 grams of water; option A
What is the mole ratio of the reaction between hydrogen and oxygen?The mole ratio of a reaction is the ratio in which the moles of reactants combine to form products.
The mole ratio of a reaction is obtained from the balanced equation of the reaction.
The balanced equation of the reaction between hydrogen and oxygen is given below:
2 H₂ + O₂ ---> 2 H₂OBased on the equation of the reaction, 2 moles of hydrogen combines with 1 mole of oxygen to form 2 moles of water.
4 grams of hydrogen = 2 moles of hydrogen
32 grams of oxygen = 1 mole of water
Mass of 2 moles of water = 2 * 18 g
Mass of 2 moles of water = 36 g of water.
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A meniscus must be considered when making which of the following measurements?
Answer:
When you read a scale on the side of a container with a meniscus, such as a graduated cylinder or volumetric flask, it's important that the measurement accounts for the meniscus. Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus. For a flat meniscus, make sure the liquid is level. Usually placing the container on a lab bench does the trick.
You won't be able to take an accurate reading looking up at the liquid level or down into it. Get eye level with the meniscus. You can either pick up the glassware to bring it to your level or else bend down to take measurements in situations where you're concerned with dropping the container or spilling its contents.
Use the same method to take measurements each time so that any errors you make will be consistent.
Explanation: