How long did the Cambrian period last for?

Answers

Answer 1

Answer: 541 million to 485.4 million years ago

Explanation:


Related Questions

The equation for the pH of a substance is pH = –log[H ], where H is the concentration of hydrogen ions. What is the approximate pH of a solution if the concentration of hydrogen ions is 5. 0 × 10–4 moles per liter? 2. 7 3. 0 3. 3 3. 6.

Answers

The formula is pH = -log[[tex]H^{+}[/tex]]. You are given the concentration of hydrogen ions so all you need to do is input that into the formula.

[tex]pH=-log[H^{+}]\\\\pH=-log[5.0x10^{-4}]\\\\pH=3.30[/tex]

What’s the empirical formula of a molecule containing 65.5% carbon, 3.5% hydrogen, and 32.0% oxygen?

Answers

Answer:

attached

Explanation:

answer attached

hope this helps!

Which phrase describes chemical potential energy?

A) the amount of energy stored in bonds
B) the amount of energy absorbed by products
C) the amount of energy needed to break a bond
D) the amount of energy absorbed by reactants

Answers

Answer:

the amount of energy stored in bonds

Explanation:

potential energy is stored energy and chemical just refers to energy stored in chemical bonds

i took the quiz

The term describes chemical potential energy is  the amount of energy stored in chemical bonds. Hence, option C is correct.

What is chemical potential energy ?

Chemical potential energy is the energy held inside a substance's chemical bonds. When gasoline is burnt in a regulated manner in the car's engine, a significant quantity of chemical potential energy that is present in the many compounds that make up gasoline is released.

When that energy is released, two things happen: part of the potential energy is converted into work, which is used to drive the automobile, and some of it is also converted to heat, which heats up the engine of the car. A system's energy changes take the form of heat, work, or a mix of the two.

Therefore, option A is correct.

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I need help with this question, I don't get it!

Answers

Answer:Its c

Explanation:

Let us use a double displacement reaction of Lead (II) Nitrate and Potassium Chromate to produce Lead (II) Chromate and Potassium Nitrate to practice balancing an equation.

We begin with the base equation provided in the question.Pb(NO3)2(aq)+K2CrO4(aq)→PbCrO4(s)+KNO3(aq)

Looking at the the atom inventory ReactantsPb=1NO3=2

K=2CrO4=1

Products

Pb=1

NO3=1

K=1

CrO4=1

We can see that the

Kand NO3

are imbalanced.

If we add a coefficient of 2 in front of the

KNO3

this will balance the equation.

Pb(NO3)2(aq)+K2CrO4(aq)→PbCrO4(s)+2KNO3(aq)

A Teacher had her students write down hypothesis about an experiment. Which is a valid hypothesis? (1 point)

Answers

Answer:

You need to add the options to this question.

Explanation:

Help please!

Read the scenario and decide whether the observations are qualitative and/or quantitative.

Danielle and Heather were in science class when they volunteered to fill the fish tank in the back of the room using a long hose connected to the sink. Mr. Ferris told them to fill the tank almost to the top and to be sure not to overflow the tank. The girls wanted to know how much water the tank could hold, so they recorded the length, width and height of the tank in centimeters. Next, they determined the total volume of the tank using the formula, length x width x height.

Answers

The observation, in this case, is quantitative.

Quantitative observation

Quantitative observations are observations that can be recorded based on quantitative data. In other words, they are observations that can be assigned numerical values.

Quantitative observations are as opposed to qualitative observations because the former cannot be assigned numerical values. They can be ranked or qualified.

In this case, Danielle and Heather could assign numbers to the length, width, and height of the tank in order to calculate its volume.

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Identify the single displacement reaction. 2H 2 O 2 ⟶ 2H 2O Al 2S 3 ⟶ 2Al 3S Cl 2 2KBr ⟶ 2KCl Br 2 C 4H 12 7O 2 ⟶ 6H 2O 4CO 2.

Answers

Reaction three is the single replacement reaction.

A single displacement or replacement reactions are the exchange of a single element with another compound or element.

Which is the single-displacement reaction?

The first reaction is a combination reaction as the water and oxygen combines togetherly to produce hydrogen peroxide and hence is incorrect.

The second reaction is a decomposition reaction in which the reactant [tex]\rm Al_{2}S_{3}[/tex] breaks into two products [tex]\rm 2Al[/tex] and  [tex]3\rm S[/tex].

The third reaction is the single replacement reaction as more reactive [tex]\rm Cl_{2}[/tex] displaces [tex]\rm Br[/tex] from the potassium to produce [tex]\rm 2KCl[/tex] and [tex]\rm Br_{2}[/tex].

The fourth reaction is a combustion reaction as hydrocarbon reacts with the oxygen molecule to produce water and carbon dioxide.

Therefore, [tex]\rm Al_{2}S_{3} \rightarrow2Al + 3S[/tex] is the single-displacement reaction.

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what is mommentum machnics​

Answers

Answer:

momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity; i.e., it has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. See Newton's laws of motion.

A researcher can determine that an exothermic reaction has occurred in a flask if …

A) the flask feels cool.
B) minimal particle movement is visible.
C) lots of particle movement is visible.
D) the flask feels warm.

Answers

Answer:

the flask feels warm

Explanation:

in exothermic reaction heat is leaving the system and entering the surroundings aka the flask

also i took the quiz

Anyone know any good chemistry jokes???

Answers

Answer:

What do you do with a sick chemist? If you can't helium, and you can't curium, then you might as well barium!

Explanation:

there

Answer:

why can you never trust a atom?

Because they literally make up everything

(i am so sorry for this lol)

What is the mass in grams of 10 moles of ammonia, NH3?

Answers

Answer:170 grams

explanation: :)

In eukaryotic cells, mRNA is produced in the....
A. cell membrane
B. endoplasmic reticulum
C. Golgi body
D. nucleus

Answers

It's the nucleus
Explanation:
mRNAs are synthesized in the nucleus, and proteins are later made in the cytoplasm.

the volume of a cylindrical tin can with a top and a bottom is to be 16Ï cubic inches. if a minimum amount of tin is to be used to construct the can, what must be the height, in inches, of the can

Answers

Answer:

The required height of the tin can is given by the height at the minimum value of the surface area function of the tin can

The height of the tin can must be 4 inches

Reason:

The given information on the tin can are;

Volume of the tin can = 16·π in.³

The amount of tin to be used = Minimum amount

The height of the can in inches required

Solution;

Let h, represent the height of the can, we have;

The surface area of the can, S.A. = 2·π·r² + 2·π·r·h

The volume of the can, V = π·r²·h

Where;

r = The radius of the tin can

h = The height of the tin can

Which gives;

16·π = π·r²·h

16 = r²·h

Which gives;

When the minimum amount of tin is used, we have;

Therefore;

4·π·(r³ - 8) = r² × 0

r³ = 8

r = 2

The radius of the tin can, r = 2 inches

The

The height of the tin can, h = 4 inches

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Explanation:

In this food chain, which describes all of the
possible energy sources for the bacteria?

Answers

Answer:

Energy flows from primary producers to consumers, in one direction only

Explanation:

Which statement correctly describes how energy transforms?

When a fire is burning, chemical energy is turned into visible energy in the form of light and thermal energy in the form of heat.

When a fire is burning, visible energy is turned into thermal energy in the form of light and chemical energy in the form of heat.

When a fire is burning, thermal energy is turned into visible energy in the form of light and chemical energy in the form of heat.

When a fire is burning, visible energy is turned into chemical energy in the form of light and thermal energy in the form of heat.

Answers

Answer: When a fire is burning, chemical energy is turned into visible energy in the form of light and thermal energy in the form of heat.

Explanation:

do isomers have the same chemical and physical properties? State a reason for your answer​

Answers

Answer:

your answer is

isomerism, the existence of molecules that have the same numbers of the same kinds of atoms (and hence the same formula) but differ in chemical and physical properties.

Hope it’s helps you Buddy

Explanation:

~Zayn

An example of a chemical change is
A dew disappearing from the grass
B mashing potatoes
C a magnet sticking to the refrigerator
D frying a hamburger

Answers

Answer:

D.) Frying a hamburger

Explanation:

A, B, and C are all physical changes whereas D is a change that alters its chemical makeup.

A chemist obtains a sample of
sodium sulfate, Na2SO4, with a mass of 71.0 g. How many formula units of sodium sulfate are in the sample?

Answers

The number of formula units of Na₂SO₄ present in the sample is 3.01×10²³ units

Avogadro's hypothesis

From Avogadro's hypothesis,

1 mole of Na₂SO₄ = 6.02×10²³ units

But

1 mole of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g

Thus,

142 g of Na₂SO₄ = 6.02×10²³ units

How to determine the units in 71 g of sample

142 g of Na₂SO₄ = 6.02×10²³ units

Therefore,

71 g of Na₂SO₄ = (71 × 6.02×10²³) / 142

71 g of Na₂SO₄ = 3.01×10²³ units

Thus, 3.01×10²³ units of Na₂SO₄ is present in the sample

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what is the mole ratio of SnF2 to HF

Answers

Answer:

Answer:

12. 5

11.

10

10

15. 7

14. 11

2

=

16

16

18. 3

+

11

17

3

4

co

loo

8

Step-by-step explanation:

12. 5

11.

10

10

15. 7

14. 11

What is the empirical formula for a compound that is 24.7 % calcium, 1.20 % hydrogen, 14.8 % carbon, and 59.3 % oxygen? *

Answers

Answer:

[tex] C_2H_2O_6Ca [/tex]

Explanation:

Here we are given that the percentage of ,

Calcium = 24.7% Hydrogen = 1.20%Carbon = 14.8% Oxygen = 59.3%

And we need to find out the Empirical formula of the compound .

Firstly divide the given percentage by the atomic mass of the compound . Here this is followed in the fourth column of the table , which will give the relative number of atoms .Secondly , divide the value obtained by the smallest value among them .Say if we got the relative number of atoms as 4 , 3 and 2 , then divide all three numbers by 2 . ( followed in 5th column below .)Finally write the Empirical formula of the compound by writing the ratio obtained as the subscript of respective compounds .

Let's make a table ,

[tex]\boxed{\begin{array}{c|c|c|c|c} \underline{\bf Element} & \underline{\bf Percentage} & \underline{\bf Atomic \ Weight } &\underline{\bf No. \ of \ atoms_{relative} } &\underline{\bf Ratio } \\\\ \sf Ca & \sf 24.7 &\sf 40 &\sf \dfrac{24.7}{40}=0.6 &\sf \dfrac{0.6}{0.6}=1 \\\\\sf H &\sf 1.20 &\sf 1 &\sf \dfrac{1.20}{1}=1.20&\sf \dfrac{1.20}{0.6}=2\\\\\sf C &\sf 14.8 &\sf 12&\sf\dfrac{14.8}{12}=1.23&\sf \dfrac{1.23}{0.6}=2\\\\\sf O &\sf 59.3 &\sf 16 &\sf\dfrac{59.3}{16}=3.7&\sf \dfrac{3.7}{0.6}=6 \end{array}}[/tex]

Therefore we got the ratio of Ca , H , C and O as 1:2:2:6 . Therefore the Empirical formula of the compund will be ,

[tex]\longrightarrow\underline{\boxed{\bf Empirical \ formula = C_3H_2O_6 Ca }}[/tex]

The empirical formula of the compound is written as C₂H₂O₆Ca.

What is empirical formula?

The empirical formula of a compound is the simplest structural formula of the compound.

Fraction of the elements in the given compound;

Ca, = 24.7/40 = 0.62

H, = 1.2/1 = 1.2

C, = 14.8/12 = 1.23

O, = 59.3/16 = 3.7

Ca: = 0.62/0.62 = 1

H: = 1.2/0.62 = 2

C: = 1.23/0.62 = 2

O: = 3.7/0.62 = 6

Thus, the empirical formula of the compound is written as C₂H₂O₆Ca.

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1. What objects in this picture are in motion?

2.What is the unbalanced force in this picture?

3. What happened to the sledder in this picture?

Answers

Sled going down is in motion
Sled hitting rock is unbalanced
He flew because the of the sudden stop threw them off

Sled is the object in this picture which is in motion. Sled hitting rock is the unbalanced force in this picture. He took off when they were startled by the abrupt stop.

What is force?

A force is an external cause that, when applied, alters or has the potential to alter a body's condition. The body comes to rest while it is moving, and it moves when it is at rest. The body's orientation, form, size, etc. may also alter as a result. An illustration would be to push or forcefully shove a door. Force has both a magnitude and a direction since it is a vector quantity.

Sled is the object in this picture which is in motion

Sled hitting rock is  is the unbalanced force in this picture

He took off when they were startled by the abrupt stop

Therefore, Sled is the object in this picture which is in motion. Sled hitting rock is  is the unbalanced force in this picture. He took off when they were startled by the abrupt stop.

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Which compound has a covalent bond?
H2O
Li2O
Na2O
K2O

Answers

Answer:

The correct answer is H20

Explanation:

A. is the correct answer!

Convert 5.38 kPa to torr

Answers

The answer is: 40.353 torrs

Where within the cell does the process of respiration take place?

Answers

Answer:

cytoplasm

Explanation:

Answer:

mitochondria

Explanation:

While most aerobic respiration (with oxygen) takes place in the cell's mitochondria, and anaerobic respiration (without oxygen) takes place within the cell's cytoplasm

Humans belong to the Kingdom Animalia and Domain Eukarya. In terms of classification, which choice best represents the hierarchy of kingdoms and domains relative to each other?


A) Kingdoms are larger than domains and include more organisms.


B) Domains are larger than kingdoms and include more organisms.


C) Kingdoms are larger than domains and include fewer organisms.


D) Domains are smaller than kingdoms and include more organisms.​

Answers

Domains are larger than kingdoms and include more organisms as far as the classification of living organisms is concerned.

Domains

When it comes to classifying living organisms, the highest level of classification is the domain. Under each domain is where we have the kingdoms.

For example, the domain eukarya contain four kingdoms; plant, animal, fungi, and protozoa.

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Answer:

The Answer is B

Explanation:

Domains are larger than kingdoms :) Your welcome

Is it ture the sun moves across the sky

Answers

Answer:

Yes, this statement is true. The sun moves across our sky from east to west.

Explanation:

(fun fact: on Mars the sun moves across the sky from west to east!)

true or false a neutral atom must have the same number of neutrons and protons​

Answers

I believe so. The positive charge on a proton is equal in magnitude to the negative charge on an electron. As a result, a neutral atom may need to have an equal number of protons and electrons.

What can you conclude about the reactivity of metals as you move down a column or group in the periodic table.

Answers

Answer:

Reactivity increases down the group

Explanation:

This is because metals reaction involves loss of an electron from an occupied orbital.

As we go down the group the relative nuclear charge decreases due to an additional orbit leading to ease in loss of an electron

Due to ease in loss of electrons down the group metals become more reactive down the group



How many molecules are in 34.61 grams of sulfur dioxide?
Give your answer in scientific notation using the form M*10^N
Type your answer...

Answers

This problem is providing us with the mass of sulfur dioxide and the molecules contained are required. At the end, the result turns out to be 3.252x10²³ molecules, according to:

Avogadro's number:

In chemistry, we use the Avogadro's number in order to successfully perform mole-mass-particles calculations. Defined as 6.022x10²³, it provides the number of atoms, molecules and ions in one mole of the substance.

In this case, in order to obtain the result, one first calculates the moles in 34.61 grams of sulfur dioxide and then utilize the Avogadro's number to obtain the number of molecules as shown below:

[tex]34.61gSO_2*\frac{1molSO_2}{64.1gSO_2}*\frac{6.022x10^{23}molecules}{1molSO_2} \\\\3.252x10^{23}molecules[/tex]

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The half-life of Radon-222 is 3.8 days. If a 10 gram sample is present, how many days will it take to have less than one gram remaining?

Answers

(alt + F4) might be the answer you are looking

Explanation:

I'm not exactly sure how I came up with this answer but it is for sure the answer

Other Questions
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