How many significant figures are in the following numbers?
a. 0.002849
b. 40030

Answers

Answer 1
What numbers?......


Explaination:

Related Questions

What is temperature

Answers

Answer:

Temperature is a physical quantity that expresses hot and cold. It is the manifestation of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy, when a body is in contact with another that is colder. Temperature is measured with a thermometer.

Answer:

The degree or intensity of heat present in a substance or object

What are the characteristics for natural resources ?

Answers

natural resources should not be man made!!

Answer:

The characteristcs of natural resources are commercial and industrial use.

It includes soil, salt, oil, natural gas, coal, iron.

What is the use of density in the calculation of percentage by mass?​

Answers

Answer:

First, the direct method requires recording the total mass of solution, and then evaporating off the solvent. The solid left behind is the solute, which is then weighed and used to calculate mass percent. Density can also be used to determine the mass percent of an unknown concentration.

in my opinion:)

I’m pretty sure the answer is 69429

A pure copper penny contains approximately 2.9×1022 copper atoms. Use the following definitions to determine how many ______ of copper atoms are in a penny. 1doz=12 1gross=144 1ream=500 1mol=6.022×1023 Part A dozens Express your answer in dozens to two significant figures.

Answers

Complete question is;

A pure copper penny contains approximately 2.9 × 10^(22) copper atoms.

1 doz = 12

1 gross = 144

1 ream = 500

1 mol = 6.022 × 10^(23)

Use these definitions to determine the following:

A) How many dozens of copper atoms are in a penny.

B) How many gross of copper atoms are in a penny

C) How many reams of copper atoms are in a penny.

D) how many moles of copper atoms are in a penny?

All answers can be rounded to two significant figures

Answer:

A) 2.4 × 10^(21) dozens

B) 2.01 × 10^(20) gross

C) 5.8 × 10^(19) reams

D) 0.048 mol

Explanation:

A) A dozen contains 12.

Therefore, 2.9 × 10^(22) copper atoms will contain;

(2.9 × 10^(22))/12 dozens = 2.42 × 10^(21).

In 2 significant figures, we have;

2.4 × 10^(21) dozens

B) 1 gross = 144

Therefore, 2.9 × 10^(22) copper atoms will contain;

(2.9 × 10^(22))/144 gross ≈ 2.01 × 10^(20) gross

C) 1 ream = 500

Therefore, 2.9 × 10^(22) copper atoms will contain;

(2.9 × 10^(22))/500 reams = 5.8 × 10^(19) reams

D) 1 mol = 6.022 × 10^(23)

Therefore, 2.9 × 10^(22) copper atoms will contain;

(2.9 × 10^(22))/(6.022 × 10^(23)) = 0.048 mol

what is the difference between ecosystem services natural resources

Answers

Answer: Ecosystem services are the flows of benefits which people gain from natural ecosystems, and natural capital is the stock of natural ecosystems from which these benefits flow. So, a forest is a component of natural capital, while climate regulation or timber might be the ecosystem service it provides.

TAn adult with the flu has a temperature of 103.0 ∘F.
Express your answer as an integer.
A brain contains 1.10×10^10 neurons.
Express your answer as an integer.
The time for a nerve impulse to travel from the feet to the brain is 0.46 s.
Express your answer as an integer.

Answers

Lolvgukvguigyuftuiffftftftfygyguuh

Answer:A integer is a whole number.

An adult with the flu has a temperature of 102°F

A brain contains  neurons (moving the decimal point to the right side power of 10 increases........here decimal point is moved to two places to the right side so power of 10 decreases from 10 to 8)

The time for a nerve impulse to travel from the feet to the brain is  s. (moving the decimal point to the right side power of 10 increases........here decimal point is moved to two places to the right side so power of 10 decreases from 0 to -2)

Explanation: i am sorry for being 2 year late :(

i hope this answer your question if this is wrong or correct please let me know

Give two real life applications of chromatography

Answers

Answer:

Food testing.

Beverage testing.

Drug testing.

Forensic testing.

Answer:

1. Additive detection

2. Crime scene testing

Naturally occurring boron has an atomic mass of 10.810 amu consists of two isotopes. One of those isotopes is 10B with an isotopic mass of 10.0129 amu and an abundance of 19.9%. What is the isotopic mass of the other isotope?

Answers

Answer:

boron has an atomic mass of 10.810 amu consists of two isotopes.

Answer:

boron has an atomic mass of 10.810 amu consists of two isotopes.

Explanation:

10. If you were running an experiment to determine the temperature at
which beans sprout the fastest, what would be the independent variable?
A.The number of beans you plant.
B.The height of the sprouts you grow
C.The amount of water you give the beans.
D. The temperature at which each bean is kept.
.

Answers

Answer:

The temperature at which each bean is kept

Explanation:

Independent variable is what YOU CHANGE

The temperature at which each bean is kept is the independent variable.

INDEPENDENT VARIABLE:

Independent variable is a variable that is changed or manipulated by the experimenter.

The independent variable, which is also called manipulable variable, causes the dependent variable to respond, which is measured or recorded.

In an experiment to determine the temperature at which beans sprout the fastest, the independent variable is the temperature at which each bean is kept is the independent variable.

Learn more: https://brainly.com/question/17498238?referrer=searchResults

Select the words that correctly complete the sentences. A class uses 10 students to model a lithium atom. Each student represents a particle in the atom. Three students wear signs with a “+” sign, representing (electrons / neutrons / protons). The four students with “0” signs represent (neutrons / protons / electrons ). Each of the remaining students wear a “–” sign, representing (protons / electrons / neutrons)

Answers

Answer:

Explanation:

Protons.

Electrons.

Neutrons.

I hope I helped you! :)

Which of these is a chemical property?

boiling point
odor
ability to rust
color

Answers

Answer:

ability to rust

Explanation:

i'm like 90% sure thats correct

The Urbana wastewater treatment plant discharge permit limits the discharge of ammonia/ammonium (NH3/NH4 ). To meet this permit, the ammonium is converted to nitrate (NO3 - ) by biological nitrification in trickling filter towers. The solution entering the nitrification towers contains 15 mg/L of NH4 as N. Write a balanced reaction for the oxidation of NH4 to nitrate,

Answers

Answer:

Explanation:

The conversion of ammonium ion  into nitrate ion is a two step process which is written below .

2 NH₄⁺ + 3 O₂ =  2NO₂⁻ + 4 H⁺ + 2H₂O

2NO₂⁻ + O₂ = 2 NO₃⁻

This is a two step reaction . These steps are managed by different class of bacteria.

Over the course of many years, a rural farm town becomes more urban. Which of the following will most likely happen in the town as a result of this urbanization?

Answers

Answer:

Explanation:

Rivers may be contaminated by sewage.

I do hope I helped you! :)

how is the caloric value of a food sample determined?

Answers

By multiplying the total amount in grams of a given food sample by energy values established by nutritionists for the particular food type i believe

A food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.

What is calorie?

The calorie is an amount of energy that derives from the outmoded caloric concept of heat. Two primary interpretations of "calorie" are frequently used due to historical factors.

The quantity of energy needed to elevate the temperature from one water molecule through one degree Celsius is known as a big calorie, food caloric intake, dietary calorie, simply kilogram calorie. A food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.

Therefore, a food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.

To know more about calorie, here:

https://brainly.com/question/3541581

#SPJ2

What substance is neither an acid nor a base? How does it stay neutral? HURRY PLS

Answers

Answer:

21. Most metals are brittle.

22. increases from top to bottom within the group

23. Neon is the most stable element because its highest occupied energy level is filled.

24. transfer of electrons

25. electrons are not shared equally between atoms

26. BeCl2

27. double-replacement and decomposition

28. exothermic

29. The reaction rate decreases.

30. The salt dissolved most quickly in the warm water.

31. saturated

32. feels slippery

33. hydroxide ions in solution

34. stay about the same

35-40. I do not know.

41. a bee hovering around a bee hive

42. the number of valence electrons in atoms of the element

Explanation:

21. Metals are ductile and malleable (conveniently also characteristics for chewing gum). They are stretchy and squishy. Brittle is the opposite of stretchy and squishy, and is a characteristic of non-metals.

22. On the periodic table, elements higher up are safer to use in labs. They are safer because they are less likely to react with other substances. Therefore the tendency to react with other substances increases from top to bottom within the group.

23. "Noble gases stable" (periodic table song by ASAP Science). Neon is a noble gas, therefore it is stable. When elements have only one electron to gain or lose, they are very reactive or least stable.

24. The formation of an ionic bond (metal + non-metal) is caused by the giving and receiving of electrons. Neutrons and protons do not transfer. Electrons are shared in covalent/molecular bonds (between non-metals).

25. A polar covalent bond occurs between non-metals, therefore they share electrons (ionic bonds transfer electrons). Non-metals become anions (whereas metals become cations). Polar bonds have unequal sharing and nonpolar bonds have equal sharing.

26. A one-to-two ratio of  beryllium ions to chloride ions means for every Be, there are two Cl. The number of atoms is represented by the ratio, and the numbers of atoms are written as subscripts after the element symbol.

27. MgCO2  reacting with HNO3  to form magnesium nitrate and carbonic acid is a double-replacement reaction. The elements in the beginning substances "switch partners" to form the products.

Carbonic acid then breaks down into water and carbon dioxide is decomposition. This occurs when the elements that make up a compound are split up.

28. In 2Cu + O2  => 2CuO + 315 kJ , the energy is on the right side. The right side is the products, or the stuff that was made. kJ is a unit to measure energy, therefore energy was made. Exothermic is the term that means energy was released.

29. Since oxygen is needed for a fire to burn, decreasing the oxygen slows the reaction rate (the reaction is burning, formally known as combustion).

30. Two things help substances dissolve: heat and stirring. Warm water is hotter than room-temperature water and ice water. This makes the salt dissolve faster.

31. A solution that contains more solute than it would normally hold is saturated. Saturated means there is a more than concentrated amount of solute in the solution. Concentrated is when there is a maximum amount of solute that will dissolve.

32. Acids do not feel slippery -- that is a characteristic of a base. To remember, bases are generally soaps and soaps are slippery. Acids taste sour  and bases taste bitter. Both acids and bases change the color of an indicator .

33. A base produces hydroxide ions, represented by OH. The OH is usually at the end of the chemical formula. Acids produce hydrogen ions, generally written at the front of the chemical formula.

34. Adding a little bit of acid to a buffer will cause the pH of the solution to stay about the same, probably increase a little. Buffer solutions are meant to make the pH "buffer". To remember, DVDs used to buffer. It's the same thing as "lag" for phones.

35-40: I'm sorry, I have no answer.

41. Electrons orbit like the plants revolve around the sun. Electrons revolve around a nucleus. A bee hovering around a bee hive  is probably flying around it in circles.

42. The tendency of an element to react is closely related to the number of valence electrons in atoms of the element.  If the valency is 8, the electron shell is full. The element is stable, opposite to reactive -- this applies to all noble gases (group 8A on the periodic table). If the valency is 1 or 7, the element is very close to being stable but not, the "desire" is so great and makes the element very reactive.

the answer is water ! there are always the same concentration of hydrogen ions and hydroxide ions, meaning it is neutral.

From the following list of elements, select the elements that are likely to form a cation. Choose one or more: A. oxygen B. chlorine C. calcium D. barium E. cesium F. rubidium G. lead H. scandium I. phosphorous From the following list of elements, select those that will always form ionic compounds in a 1:2 ratio with the halogens. Choose one or more: A. phosphorous B. lead C. chlorine D. cesium E. rubidium F. scandium G. barium H. oxygen I. calcium

Answers

Answer:

(i). The elements that are likely to form a cation

(C). calcium, (D). barium, (E). cesium, (F). rubidium, (G).  lead and (H). scandium

(ii). The elements those that will always form ionic compounds in a 1:2 ratio with the halogens

(B).  lead, (G) barium and (I). calcium

Explanation:

Given that,

The following list of elements,

A. oxygen B. chlorine C. calcium D. barium E. cesium F. rubidium G. lead H. scandium I. phosphorous

We know that,

Cation is defined as, an element which is able to donate electron easily and obtained positive ion.

All metal elements able to form cations.

We need to find the elements that are likely to form a cation

Using given list

(C). calcium

(D). barium

(E). cesium    

(F). rubidium    

(G).  lead

(H). scandium

(II). The following list of elements,

A. phosphorous B. lead C. chlorine D. cesium E. rubidium F. scandium G. barium H. oxygen I. calcium  

We know that,

All given metal ions can form ionic compound with halogens as 1:2 ratio because all given metals can form +2 charge.

We need to calculate the elements those that will always form ionic compounds in a 1:2 ratio with the halogens

Using given list.

(B).  lead

(G) barium

(I). calcium

Hence, (i). The elements that are likely to form a cation

(C). calcium, (D). barium, (E). cesium, (F). rubidium, (G).  lead and (H). scandium

(ii). The elements those that will always form ionic compounds in a 1:2 ratio with the halogens

(B).  lead, (G) barium and (I). calcium

A average marathon runner run the 26.1 miles in 4 hrs 30 minutes. What is the runners average pace in miles/minutes.

Answers

Explanation:

4hr 30 m = 270 min

270/ 26.1 = 10. 34

1 mile per 10.34 mins

For what types of numbers is scientific notation especially
useful? I. very large numbers II. very small numbers
a ll only
b Neither I nor ||
Cl and II
d l only

Answers

Scientific notation is useful for I and II

Very large and very small numbers :)

The correct answer is C: I and ||

Scientific notation is used for very large and very small numbers.

It is more comfortable sometimes to express numbers in scientific notation. The parts of a scientific notation for number are: coefficient, base and exponent.

The larger or smaller the exponent, the more convenient it is to express the number in scientific notation.

Hence, very large and very small numbers are best expressed in scientific notation.

https://brainly.com/question/15361382

. A certain medication is set to deliver through an IV at a rate of 3.0 mg/min. What is this rate in mg/s?

Answers

Answer:

[tex]rate=0.05\frac{mg}{min}[/tex]

Explanation:

Hello,

In this case, considering that 1 min equals 60 seconds, we need to perform the unit conversion as shown below in order to compute the rate on mg/s:

[tex]rate=3.0\frac{mg}{min}*\frac{1min}{60s} \\ \\rate=0.05\frac{mg}{min}[/tex]

Best regards.

M= 34.1g V= 78.5 mL D=?

Answers

Answer:

The answer is

0.43 g/mL

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question

mass = 34.1 g

volume = 78.5 mL

The density is

[tex]density = \frac{34.1}{78 .5} \\ \approx 0.434394904...[/tex]

We have the final answer as

0.43 g/mL

Hope this helps you

What is another name for Group 6A? O A. Group A6 O B. Group 6B O C. Group 16 D. Group 6​

Answers

Answer: group 16

Explanation: apex

PLEASE PLEASE ANY CHEMISTRY EXPERT!! HELP NEEDED. See attached.

Determine whether each pair of compounds forms a homogeneous solution when combined. For those that form homogeneous solutions, indicate the type of forces that are involved.

Answers

Answer:

Explanation:

1st)  one are homogenous because the have the same kind of force 9 London force ) all the hydrocarbons are nonpolar and have a London force between their molecules

 so pentane dissolve in hexane (like dissolves like )

2nd )  CBr4  has a tetrahedral shape its a nonpolar compound (London bond )

           but  the water is polar molecules  has a  ( hydrogen bond ) its  molecular shape (bent shape)  . Both do not dissolve in each other because they have a different kinds of bond so they are  not a homogenous solution .

3rd) its a homogenous because the water can dissolve the ionic bonds between the Li (  cation ) and  (NO3 -1  anion ).

4th ) here we can say alcohol can dissolve in a little amount why ?

    pentane has a London force bond Alcohol has two different parts  first  part  has OH making hydrogen bond which cant dissolve in the pentane different kinds of bonds ,and the other part -CH3 has a London force bond that can dissolves easily in the pentaneso  one part dissolves but  the other part  can't dissolve so the two compound are slightly dissolves in each other  that which mean its not a homogenous solution

What state of matter is ice in a glacier?
Gas
Liquid
Solid
Transitive

Answers

Answer: solid

Explanation:Ice is the solid state of water, a normally liquid substance that freezes to the solid state at temperatures of 0 °C (32 °F) or lower and expands to the gaseous state at temperatures of 100 °C (212 °F) or higher.

find the R when p=6000,T=3 yrs 6 month ,I=1155​

Answers

Answer:770R=I×100/P×T

R= 1155×100/6000×3/12

R= 1155×2/3

R=770

What characteristics identify a substance?

Answers

Answer:

All substances can be characterized by their unique sets of physical and chemical properties.

What is 2.1 x 10^6 + 6.2 x 10^7 in scientific notation

Answers

Answer:

2100000 + 62000000

Explanation:

You move the decimal place to the right or left acording to the exponent (right if the exponent in positive, left of the exponent in negative.) Ex: if you're solving for 6.2*10^7 you move the decimal 7 places to the right.

Hope this helped,

-Kiddoo :)

Read this description of the life cycle of a mushroom. 1. A mushroom begins to grow underground as a single-celled "spore.” 2. The spore grows into multicellular structures called "hyphae.” 3. The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground. 4. The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again. Which sentence about this life cycle shows that mushrooms need energy and respond to stimuli? A: A mushroom begins to grow underground as a single-celled “spore.” B: The spore grows into multicellular structures called “hyphae.” C: The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground. D: The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again

Answers

Answer:

Explanation:

I would sayy....C The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground.

Um I hope I helped bro :P

(-W-) but where's da cOokIeS??..........................Lol jkkk

Answer:

D THE SPROUTEEDMUSHROOM

Explanation:

The sense of hotness or coldness by touching always does not work well.why?​

Answers

Answer:

because if the hotness should more it will give it increase the temperature of earn water but it is not so because you have taken out hands from your and cold water So it is reliable

Explain why CaCl2 is likely to have properties similar to those of CaBr2

Answers

Answer:

Because both compounds (CaCl2 and CaBr2) contain elements (bromine and chlorine) from the same group (group 7)

Explanation:

Elements are organized into groups on the periodic table based on the number of valence electrons contained in their outermost shell. These elements in the same group i.e. same number of valence electrons, will behave in a similar manner chemically.

CaCl2 and CaBr2 are two compounds that contains elements (Chlorine and Bromine) from the same group, which is group 7. Elements in group 7 are called HALOGENS and have 7 valence electrons in their outermost shell.

Bromine (Br) and Chorine (Cl) are responsible for the similarity in the properties of CaCl2 and CaBr2 because the Chlorine and Bromine contained in them will cause them to react similarly and behave similarly in the presence of other compounds.

Which action changes the identity of substance referenced

Answers

Answer:

When iron turns to rust, the chemical identity of the iron changes. When you break ice, the ice is still ice

Other Questions
Which of the following statements concerning the sample size of an experiment is not accurate?A. A smaller sample size decreases confidence in the accuracy of a study.B. A larger sample increases confidence in the accuracy of a study.C. A smaller sample size increases generalizability of a studyD. A larger sample increases generalizability of a study. with schools shut across the world,millions of children have adopted to distance learning .refer (the fun they had) and the present situation give your views on this topic.(((pls help)))) In please v Ferguson, the Supreme Court upheld policies that allowed discrimination. What was the reasoning about facilities plz help me i dont understand this one Which one of the following statements contains bias? A. it has rained for three days without stopping. B. It was sunday afternoon before he finished. C. The school budget was reduced by 20 percent. D. The employees whined about their low wages. Which describes a controlled experiment? A.an experiment in which the dependent variable B.an experiment that contains two or more independent variables C.an experiment that contains only one independent variable D.an experiment that contains no independent or dependent variables Pls help!!! E varies directly with G. When G is 6, E is 10. Find the value of G when E is 18. FInd the slope y = -2 Which is one factor that internally influences the onset of puberty? Between 9 P.M. and 6:10 A.M., the water level in a swimming pool decreased by 5/12. Assuming that the water level decreased at a constant rate, how much did the water level drop each hour? You wish to push a cart across a friction less surface, so youapply a 20 N force for a period of 3 seconds. As a result, thecart goes from rest to a velocity of 2.3 m/s. What is the mass ofthe cart? How is water transferred within and between organisms and the environment? FREE BRAINLIEST! Are waffles really pancakes with abs? 12. SAQ#2 A. Briefly identify and describe one feature of David by Michelangelothat is humanistic. B. Briefly identify and describe one feature of David byMichelangelo that is secular. C. Briefly identify and describe one feature of Davidby Michelangelo that shows individualism. Explain the energy transformation process needed to create an electromagnet . What is the Correct Answer? solve for T10t = -50 What motivated the Spanish-American war?100 points, will mark brainliest - The area of a triangle is 9.45 m2. If the base is 2.65 m, what is the height? You are an engineer working in a auto crash test lab. Some members of your team have raised objections against the use of cadavers in the crashes. No reliable data exists that shows that cadavers produces more accurate data, but many coworkers argue that common suggest they do. Others claim that the use of cadavers as mere instruments for our well-being disrespects those individuals, who have not consented to use their bodies for this purpose. The question of whether to continue to use cadavers in the lab is what kind of issue?