Answer: A. the age of a layer of rock
Explanation:
Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time.
Index fossils are found throughout the world and come from organisms which existed during the limited periods of geologic time. Index fossils can be used to determine the age of a layer of rock. Thus, the correct option is A.
What is Index fossil?Index fossil is any kind of animal or plant that is preserved in the rock record of the Earth which is characteristic of a particular span of geologic time. A useful index fossil must be distinctive or is easily recognizable, abundant, and have a very wide geographic distribution and also a short range through time.
Index fossils are used to define the geological periods or the age of a layer of rock. These fossils can be defined as the commonly found, widely distributed fossils that are limited in time span. If a person finds an index fossil in a given layer, then he has bounds on the age of the layer.
Therefore, the correct option is A.
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3. Trees, bananas, skateboards and pancakes are all solids. They have
atoms that are closely packed together and don't move around very
much. Solids also have definite shape, mass and volume. "Definite"
means that it doesn't easily change. When you pour cereal into a bowl,
the pieces of cereal don't change shape. But when you pour milk into a
bowl, the milk takes the shape of the bowl. That's because cereal is a
solid.
A
Which of the following is an example of a solid?
A. applesauce
Corange juice
B. watermelon
D. berry smoothie
Answer:
B. Watermelon
Explanation:
Watermelon is the only option with a definite shape that wouldn't change if you put it in a bowl
Write the beta decay equation for the following isotope: 91 38 Sr? Please write out steps
Answer:
[tex]\rm _{38}^{91}Sr \longrightarrow \, _{-1}^{0}e + \, _{39}^{91}Y[/tex]
Explanation:
The unbalanced nuclear equation is
[tex]\rm _{38}^{91}Sr \longrightarrow \, _{-1}^{0}e \, + \, ?[/tex]
Let's write the question mark as a nuclear symbol.
[tex]\rm _{38}^{91}Se} \longrightarrow \, _{-1}^{0}e \, + \, _{Z}^{A}X[/tex]
The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.
Then
98 = 0 + A, so A = 98 - 0 = 98, and
38 = -1 + Z, so Z = 38 + 1 = 39
Then, your nuclear equation becomes
[tex]\rm _{38}^{91}Sr \longrightarrow \, _{-1}^{0}e + \, _{39}^{91}X[/tex]
Element 39 is yttrium, so the balanced nuclear equation is
[tex]\rm _{38}^{91}Sr \longrightarrow \, _{-1}^{0}e + \, _{39}^{91}Y[/tex]
Identifying Ways Rocks Change in the Rock Cycle Cycle of a rock. Arrows point from one stage to the next. Stage A, small, brown granules, to Compaction and cementation or Stage C. Arrow labeled Heat and pressure from Stage C to B, larger gray rocks. Arrow labeled Melting from Stage B to Magma. Arrow labeled Cooling from Magma to Igneous Rock. Arrow labeled Melting from Igneous Rock to Magma. Stage D arrows from Igneous Rock to Stage A, from Stage B to A, and from Stage C to A. Using the drop-down menus, label the parts of the rock cycle.
A- sediment, sedimentary rock, or metamorphic rock
B- sediment, sedimentary rock, or metamorphic rock
C- sediment, sedimentary rock or metamorphic rock
D- compaction and cementation, heat and pressure, or weathering and erosion
Answer:
sediment, metamorphic rock, sedimentary rock, weathering and erosion
Explanation:
for edge 2020
hope this helps
HAVE A GREAT DAY : )
Sediment, sedimentary rock, or metamorphic rock are the parts of the rock cycle. Therefore, the correct option is option A.
What are sedimentary rock, and metamorphic rock?Sedimentary rocks are created by the aggregation or deposition of organic or mineral particles at the Earth's surface, following by cementation. Sedimentation refers to the mechanisms that lead these grains to settle in situ.
Any of a family of rocks formed by the modification of pre - existing rocks in reaction to changing environmental circumstances, such as temperature, pressure, or mechanical stress, as well as the addition or deletion of chemical components is metamorphic rock. Sediment, sedimentary rock, or metamorphic rock are the parts of the rock cycle.
Therefore, the correct option is option A.
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How does the concentration of reactants affect the rate of a reaction?
A. Increasing the concentration increases the kinetic energy of the
molecules.
B. Increasing the concentration increases the molecules' collision
frequency
c. Increasing the concentration decreases the reaction's activation
energy
D. Increasing the concentration increases the temperature of the
solution
Answer: The amount of reactant doesn't really affect the rate of reaction, but the concentration does.
In order for there to be a reaction there has to be collisions between molecules, but only a fraction of these collisions are successful. The molecules have to be moving with enough energy, called the activation energy, to break the bonds between atoms. If there is a higher concentration of a solution, there are more molecules present per unit volume. This means that there will be more collisions and therefore more successful collisions, increasing the rate of reaction.
Explanation:
B
Answer: c
Explanation: im pretty sure its right im sorry if not
What causes a molecule to have a net dipole moment?
A. The presence of only nonpolar bonds in the molecule
B. The presence of Van der Waals forces
C. The presence of a net charge that does not cancel out
D. The presence of both covalent and ionic bonds in the molecule
Answer:
Option C
Explanation:
Dipole moment being ac vector quantity has both magnitude and direction. All bonding forces have dipole moment ranging from partially positive to negative moment.
Net dipole moment is the dipole moment arising after summation of all the existing dipole moments. On the basis of dipole moment it is determined whether the molecule is polar or non polar.
Hence, option c is correct
Answer:c
Explanation:
A weather forecast shows 35 m/h on the weather map. Which weather component does this number represent?
A.Humidity
B. Precipitation
C.Wind direction
D.Wind speed
Answer:
D. Wind Speed
Explanation:
When the question brings up 35 m/h, the m/h stands for Miles per Hour. What option can you measure the miles per hour. Here's a hint, it applies to cars as well when cops give your parents speeding tickets. Miles per Hour = Speed. So, you are measuring the wind speed.
Why were scientists surprised to find coal in the arctic?
Answer:
coal is made from compressed plant matter and how exactly did plants grow on the surface of an ocean. (as there is no land mass beneath the arctic.)
Explanation:
it would be like finding a fly in an ice cube to simplify it.
They were surprised to find coal in arctic because ordinarily coal was supposed to be found in warm or hot environments and not cold region like the arctic.
The arctic is located at the far northern part of the world which is characterized by its extreme cold weather.
A limited vegetation of plants such as grasses, mosses and lichens are found in this region irrespective of the extreme cold weather through out the year.
Coal is a type of fuel gotten from fossils and deposits of plant vegetation.
Scientist has discovered that continents do move over time through a process called continental drift. This is the reason why limited vegetaion is found in the arctic leading to the formation of coal.
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Which is usually associated with a faster reaction rate?
A. diluting a solution of the reactants
B. adding modeling clay to the reactants
C. removing heat energy from the reactants
D. using a solid with a high surface area in the reactants
Answer:
D. using a solid with a high surface area in the reactants, is your correct answer.
Explanation:
Using a solid with a high surface area in the reactants is usually associated with a higher reaction rate.
I just need the answer please to both if you can
Answer:
No.4 is B No.5 is d
Explanation:
Answer:
Q 4: d
Explanation: this is all I can answer
An ideal gas, such as helium, is in a sealed container made of hard steel. If the container is heated, what would happen to the gas trapped inside the container?
Group of answer choices
The volume of the gas will decrease
The pressure of the gas will increase
The volume of the gas will increase
The pressure of the gas will decrease
Answer:
The correct answer is The pressure of the gas will increase
The volume of the gas will increase
Explanation:
Step 1: Data given
The gas in a container is heated, this means the temperature increases
Suppose we start with a temperature of 100 K and a pressure of 1 atm and a volume of 1L
Step 2:
V1/T1= V2/T2
⇒V1 = the initial volume = 1L
⇒T1 = the initial temperature = 100 K
⇒V2 = the new volume = TO BE DETERMINED
⇒T2 = the increased temperature = 200 K
1/100 = V2 / 200
V2 = 2 L
This means when the temperature increases, the volume will increase
P1/T1 = P2/T2
⇒P1 = the initial pressure = 1 atm
⇒T1 = the initial temperature = 100 K
⇒P2 = the new pressure = TO BE DETERMINED
⇒T2 = the increased temperature = 200 K
1/100 = P2 / 200
P2 = 2 atm
This means when the temperature increases, the pressure will increase
The correct answer is The pressure of the gas will increase
The volume of the gas will increase
Consider a system of four gases. The equilibrium concentration of each product is 2.3 M and the equilibrium concentrations of the reactants are equal. The equilibrium is shown here:
A + B C + D K = 2.6
What is the equilibrium concentration of gas A?
Answer:
The equilibrium concentration of gas A is 1.43 M
Explanation:
Here we have the reaction expressed as follows;
A + B → C + D and
The formula for equilibrium constant is therefore presented as follows;
[tex]K = \frac{[C]\times [D]}{[A]\times [B]}[/tex]
Where:
[C] = [D] = 2.3 M
[A] = [B]
K = 2.6
Hence, we have;
[tex]2.6 = \frac{2.3\times 2.3}{[A]\times [A]} = \frac{5.29}{[A]^2}[/tex]
[tex][A]^2= \frac{5.29}{2.6} = 2.03[/tex]
[A] = 1.43 M
The equilibrium concentration of gas A = 1.43 M.
Answer:
The equilibrium concentration of gas A = 1.43 M
Explanation:
First set up the equilibrium expression:
[tex]K = \frac{[C]\times [D]}{[A]\times [B]}[/tex]
The problem states that each product has a concentration of 2.3M at equilibrium, and that k=2.6
We also know that [A] and [B] are the same.
Since we are solving for [A] I'm going to change [A][B] to A²
[tex]2.6 =\frac{2.3^2}{A^2}[/tex]
Now we just need to solve for A²
A² = 5.29 / 2.6
A² = 2.0346
A = √2.0346
A = 1.43
Therefore, the equilibrium concentration of gas A = 1.43 M.
Explain why many Lewis acids and bases are not classified as Arrhenius or Brønsted-Lowry acids and bases
Answer:
Lewis acids cannot have a hydroxide or hydrogen ion or donate a hydrogen ion, so they are neither an Arrhenius or a Brønsted-Lowry acid or base. Lewis bases will always be Brønsted-Lowry bases because they can accept a hydrogen ion.
According to Lewis concept ,Lewis acids cannot have hydroxide or hydrogen ion or donate a hydrogen ion, so they are neither an Arrhenius or a Brønsted-Lowry acid or base. Lewis bases will always be Brønsted-Lowry bases because they can accept a hydrogen ion.
What is Lewis concept?According to Lewis concept, Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.
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What is the molarity of a solution in which 0.45 grams of sodium nitrate (NaNO3) are dissolved in 265mL of the solution?
A. 29.8M
B. 87.2M
C. 0.02M
D. 0.52M
Answer:
M=0.02
Explanation:
85 g NaNO3 -> 1 mol NaNO3
0.45 g NaNO3 ->x
x=(0.45 g NaNO3 * 1 mol NaNO3)/85 g NaNO3 x= 5.3 x 10^-3 mol
265 mL= 0.265 L
M= mol solute/ L solution
M= 5.3 x 10^-3 mol NaNO3/0.265 L M=0.02
Which statement best describes liquid water and water vapor at equilibrium?
A. Liquid water stops entering the gas phase.
O B. The concentration of liquid water equals the concentration of
water vapor.
C. The concentrations of liquid water and water vapor are stable.
D. The concentration of liquid water is zero.
C. The concentrations of liquid water and water vapor are stable. it describes the fact that liquid water and water vapor are at equilibrium.
EquilibriumAn equilibrium is achieved when no more water vapor can enter into the gas phase from the liquid water during evaporation process. This happens when a saturation is attained between liquid water and the vapor phase.Hence, option (c) is correct. The concentration of liquid water and water vapor will become stable.
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Adding concentrated
sulfuric acid to sugar
What reaction is this?
Answer:
Dehydration of Sugar
Explanation:
Two objects, labeled A and B, are the same size. Object A has a density of 1.21 g/cm3. Object B has a density of 1.37 g/cm3. Both are placed in a beaker of water. Which will float higher in the water?
Answer:
object a will float higher because it has less density.
Explanation:
Answer:
object a will float higher because it has less density.
Explanation:
What is the purpose of the part of the male reproductive system that is
highlighted below?
A. Mixes sperm and semen
B. Creates the fluid in semen
C. Manufactures sperm cells
D. Stores sperm cells until they mature
O
Answer:
A
Explanation:
Unlike the female reproductive system, the most parts of the male reproductive system are located outside the body. The mentioned part in the given diagram is urethra and it Mixes sperm and semen. The correct option is A.
What is male Reproductive system?The male reproductive system includes the testes, scrotum, spermatic ducts, male accessory glands and phallus. All these organs work together to produce sperms, the male gamete, male sex hormones and other components of semen.
The phallus and urethra are the parts of both the reproductive and urinary systems. Scrotum, seminal vesicles, vas deferens, testicles and prostate constitute all the remaining male reproductive system.
The urethra is a tube like structure which is the region included in the urinary tract that takes the urine from the bladder where the semen is ejaculated.
Thus the correct option is A.
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What slows down heat energy from escaping the Earth?
Answer:
Greenhouse gases such as carbon dioxide and water vapor make an atmosphere around the earth and make less heat escape
Explanation:
I AM GIVING BRAINLIEST PLEASEE HELPPPP I NEED HELPPPPPP PLEAEEEEEE
63.2 g of BaCl 2 are dissolved in enough water to make a 634 mL solution. What is the molarity?
Answer:
0.479 M or mol/L
Explanation:
So Molarity is moles/litres of solution...often written as M=mol/L
So here we are given grams of BaCl2 which we have to convert to moles. To convert to moles of BaCl2 we have to divide 63.2 g BaCl2 by molar mass of BaCl2 which is 208.23 g/mol so you get 63.2/208.23 = 0.3035 moles of BaCl2
Second step is converting the 634mL to litres by simply dividing by 1000 because we know 1 litre has 1000ml so 634/1000 = 0.634L
Now we just plug these guys in our molarity formula M=mol/L
M= 0.3035/0.634 = 0.479 M or mol/L
Answer:
Interestingly enough, I'm not getting
0.0341% w/v
either. Here's why.
Start by calculating the percent composition of chlorine,
Cl
, in calcium chloride, This will help you calculate the mass of chloride anions,
Cl
−
, present in your sample.
To do that, use the molar mass of calcium chloride, the molar mass of elemental chlorine, and the fact that
1
mole of calcium chloride contains
2
moles of chlorine atoms.
2
×
35.453
g mol
−
1
110.98
g mol
−
1
⋅
100
%
=
63.89% Cl
This means that for every
100 g
of calcium chloride, you get
63.89 g
of chlorine.
As you know, the mass of an ion is approximately equal to the mass of the neutral atom, so you can say that for every
100 g
of calcium chloride, you get
63.89 g
of chloride anions,
Cl
−
.
This implies that your sample contains
0.543
g CaCl
2
⋅
63.89 g Cl
−
100
g CaCl
2
=
0.3469 g Cl
−
Now, in order to find the mass by volume percent concentration of chloride anions in the resulting solution, you must determine the mass of chloride anions present in
100 mL
of this solution.
Since you know that
500 mL
of solution contain
0.3469 g
of chloride anions, you can say that
100 mL
of solution will contain
100
mL solution
⋅
0.3469 g Cl
−
500
mL solution
=
0.06938 g Cl
−
Therefore, you can say that the mass by volume percent concentration of chloride anions will be
% m/v = 0.069% Cl
−
−−−−−−−−−−−−−−−−−−−
I'll leave the answer rounded to two sig figs, but keep in mind that you have one significant figure for the volume of the solution.
.
Explanation:
Why would the pressure of a sample of gas at a constant volume fall .10 atm?
Answer:
As the temperature of a sample of gas falls from 45.0ºC to 30.0ºC, its pressure falls to 300.
Explanation:
I need an answer ASAP!!
Answer:
C:
Explanation:
Current flows from negative to positive.So the electrons will be moving left.
when a current is applied, positive charged copper ions (called cations) leave the anode (positive electrode) and move to the cathode (negative electrode).
A gas was held at a constant temperature in a closed system. The initial
pressure of the gas was 1.20 atm, while its initial volume was 2.30 L. The
final volume of the gas was 1.50 L. What was the final pressure of the gas
to the nearest hundredth of an atmosphere?*
Answer:
1.84 atm
Explanation:
P2=V1P1/V2
Temp is irrelevant because it is constant, so all you have to do is rearrange the ideal gas law.
You can check this by knowing P and V at constant T have an inverse relationship and therefore makes this the correct answer.
- Hope that helps! Please let me know if you need further explanation.
If I have 12.0 volume of gas at pressure of 1.10 and temperature of 200k, what is the number of moles? (R=8314)
Answer:
7.94 x 10^6 mol
Explanation:
PV=nRT
n=(PV)/(RT)
n=(1.10*12.0)/(8314*200)
n=7.94 x 10^6 mol
Referencing the reasoning you used from #1, explain the difference between objects that feel hot and those that
feel "cold".
Answer:
The temperature of the cold water is lower than the warm one. So, when we put the hand in the warm from the cold water, our hand will absorb heat, causing the hand to feel hot. Thus, we can conclude that the more heat it absorbs, the more hotter it is. Whereas the more heat it releases, the colder it is.
What Le Chatelier’s factors cause an increase in the concentration of Hb(CO)4(aq) in the Hb(CO)4(aq) + 4O2(g)Hb(O2)4(aq) + 4CO(g)
Answer:
Explanation:
Hb(CO)4(aq) + 4O2(g) ⇄ Hb(O2)4(aq) + 4CO(g)
1 ) If we increase the concentration of CO(g) , the reaction above will proceed in reverse direction to decrease its concentration, according to Le Chatelier principle. Hence more of Hb(CO)4(aq) will be formed.
2 ) If we decrease the concentration of O₂ , then also , reaction will proceed in reverse direction . Hence concentration of Hb(CO)4(aq) will be increased .
If a woman is pushing a cart 125 N forward and gravity is pushing 50 N backwards on the cart and a child is pushing 25 N backwards on the cart what is the net force?
Answer: 50N forward
Explanation:
A woman is pushing a cart 125N forward (+125N)
Gravity is pushing 50N backwards (-50N)
A child is pushing 25N backwards (-25N)
The net force is the total sum of these forces.
125N+(-50N)+(-25N)
125N-50N-25N
125N-75N
50N forward because it's positive
Answer:
Explanation: A woman is pushing a cart 125N forward (+125N)
Gravity is pushing 50N backwards (-50N)
A child is pushing 25N backwards (-25N)
The net force is the total sum of these forces.
125N+(-50N)+(-25N)
125N-50N-25N
125N-75N
50N forward because it's positive
Which of the following gases will diffuse the fastest at room temperature?
H2
Ne
He
O2
Answer:
I am pretty sure that it is A. H2.
Explanation:
Sorry if it's wrong.
What improvements have been made in modern farming? Select all that apply.
1. machines can do more work over less time
2. better seeds sprout and grow much more quickly
3. trains can transport food over long distances faster
4. trains can transport the machines to rural farms once built
5. insecticides used to keep insects off the crops
Answer:
all of them except number 2
Explanation:
Answer:
1,3,4,5 the other perosn is correct
Explanation: That what my quiz said
Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?
OA.
There are six parent carbon atoms and one triple carbon bond.
There are six parent carbon atoms and one double carbon bond.
B.
C. There are seven parent carbon atoms and one triple bond.
D. There are eight parent carbon atoms and all single carbon bonds.
E.
There are eight parent carbon atoms and one triple bond.
Answer:
Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?
A.There are six parent carbon atoms and one triple carbon bond.
B.There are six parent carbon atoms and one double carbon bond.
C. There are seven parent carbon atoms and one triple bond.
D. There are eight parent carbon atoms and all single carbon bonds.
E.There are eight parent carbon atoms and one triple bond.
Explanation:
The correct answer is A. The prefix "hex-" indicates that there are six carbon atoms in the molecule, and the suffix "-yne" indicates that there is a triple bond between two of the carbon atoms. Therefore, hexyne has six carbon atoms and one triple bond.
balance the following equation:
!!!!
Answer:
CaC2 + 2H2O > C2H2 + Ca(OH)2
Explanation:
Count the amounts of Ca, C, H, and O, all separately on both sides.
Ca: 1 Ca: 1
C: 2 C:2
H: 2 H: 4
O: 1 O: 2
Now, your goal is to get both sides equal to each other by adding a 2 in front of H2O.
