Significant digits for the number 80

Answers

Answer 1

Answer:

8 and 0

Explanation:

8 and 0 together make 80


Related Questions

The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and

Answers

Answer:

Electrons

Explanation:

Isotopes are atoms which have the same number of protons and electrons but a different number of neutrons. This is also the reason why there are no other changes in the atom but the mass of the specific atom changes.

Hope this helps :)

Merry Christmas. Have fun.

In a bond between potassium (K) and bromine (Br),

A.

the potassium atom will gain an electron and become smaller as a cation, while the barium atom will lose an electron and become bigger as an anion.

B.

the potassium atom will lose an electron and become smaller as an anion, while the barium atom will gain an electron and become bigger as a cation.


C. the potassium atom will gain an electron and become smaller as an anion, while the barium atom will lose an electron and become bigger as a cation.

D.

the potassium atom will lose an electron and become smaller as a cation, while the barium atom will gain an electron and become bigger as an anion.

Answers

Answer:

D (But as a heads up, you wrote barium instead of Bromine)

Explanation:

The Potassium atom will lose an electron since its valence shell only has one, while Bromine has 7 electrons in its valence shell. Potassium wants to get rid of its one electron, Bromine wants to gain that one electron to get a full shell.

Potassium will become a CATION with a positive charge (since it lost an electron), Bromine will become an ANION with a negative charge (since it gained an electron)

(01.07 HC)

A student collected the data shown in the table below during an experiment.


Liquid Characteristics
Liquid Characteristics
Boiling Point Freezing Point Color Expansion per Degree Change in Temperature
Mercury 357 °C −39 °C shiny silver gray relatively lower
Alcohol 78 °C −115 °C colorless relatively higher


Based on the data, which of the following conclusions can be made about the use of mercury and alcohol thermometers?
A mercury thermometer can measure the freezing point of a liquid that freezes at −80 °C.
An alcohol thermometer can measure the boiling point of a liquid that boils at 80 °C.
A mercury thermometer is better to measure very small changes in temperature.
An alcohol thermometer is better to measure the boiling points of colorless liquids.

Answers

Answer: a mercury thermometer is better to measure very small changes in temperature

Explanation:

i took the test and got it right

Answer:

the answer is C, a mercury thermometer is better to measure very small changes in temperature.

Explanation:

i just took the test and it was correct :)

2. What problem did astronaut Eugene Cernan encounter while on an EVA? How did it relate to
Newton's third law of motion?

Answers

Answer:

Well he couldn't be pushed back as there isn't a place for him to float back, because of Newton's third law: Every force has an opposite force when Eugene pushes, he will float backwards

Explanation:

Hope this helps!

3CaCl2 + Al2O3 —> 3CaO + 2AlCl

Answers

im not sure about the answer sorry in advance if it's wrong

Give atleast 5 differences in cell structures of plant and animal cells

Answers

The shape, the cell wall, chlorophyll, the components of the nucleus, cytoplasm

What is the dependent variable in this graph

Answers

Answer:

height (mm)

Explanation:

The independent variable belongs on the x-axis (horizontal line) of the graph, and the dependent variable belongs on the y-axis (vertical line).

What rule predicts the, stability of a atoms forming compounds.

Answers

Answer:The octet rule

Explanation:that there is eight electrons in the valence shell to make it stable.

Explanation:

atom with greater stability have less energy, so a reaction that the stability of the atom will release in the form of heat or light.

A) Oxygen
B) water and oxygen
C) water and carbon dioxide
D) water and carbon monoxide

Answers

Answer:

A

Explanation:

this is because combustion is the chemical reaction between surfaces including OXYGEN to generate heat and light in the form of flame

______= Speed / Wavelength

Answers

Answer:

Frequency

Explanation:

It’s kinda self-explanatory but bascially speed=wavelength times frequency

Answer:

Frequency is Speed divided by Wavelength

Step-by-step explanation:

Don't think there needs to be an explanation for the formula, unless you want the conceptual understanding

can someone please explain how to find an emperical formula given mass not percentage?​

Answers

Answer:

1. Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages). ...

2. Convert the mass of each element to moles. ...

3. Find the ratio of the moles of each element. ..

4. Use the mole ratio to write the empirical fomula

Answer:

Multiply each result by the given mass.

Explanation:

Hi!

In order to find percent/mass composition you would

1. write the formula

2. calculate the molar mass for each equation

3. add all the masses to get the compound molar mass

4. divide each molar mass by the total mass

and then for mass composition, you would multiple eachy result by the given mass.

For example;

Calculate the number of grams of gold in 89.6 grams of gold(1) perchlorate.

Your formula would be AuClo4

Au : 196.96 x 1

Cl: 35.4 x 1

O: 16 x 4

Add the masses together to get 296.5 g/mol

Lets say we're looking for Oxygen. You would take what you got (16 x 4) and divide it by the total mass. 64/296.5

This would equal 0.215. Instead of multiplying this by 100 like you would for percent, for mass you would multiply by what is given. in this instance it is 89.6.

0.215 x 89.6 = 19

But the question is asking for gold,

197/296

= 0.664 x 89.6

= 59.5

Your answer would be 59.5 grams Au

Hope this helped! : D

if you can’t already tell by the amount of questions i do not understand chemistry lol, giving brainliest

Answers

Answer:

Ok, so the process here is to convert the mass of H2 (hydrogen gas) to moles by dividing the mass by the molar mass of H2. Once you have the moles then you have to multiply by the STP (standard temperature and pressure) molar volume which should be 22.4.

Molar mass of H2 = (1.01)x2 = 2.02g/mol

19.3/2.02 = 9.55 moles

Now just multiply the moles by the molar volume

9.55 moles x 22.4 = 213.92 Litres of H2 are in 19.3g of H2

Elements in a vertical column on the Periodic Table have similar properties and are all members of the same
of elements.
ME
A
molecule
HD
B
phase
С
atom
D
group

Answers

Answer:

Explanation:

I think it's D but I could be wrong

Answer:

D

Explanation:

Sleet forms directly from which type of precipitation?

Answers

Sleet is a type of precipitation that is formed by water and snow that is usually partially molten.

What is sleet?

Sleet consists of icy raindrops that hit the surface, that is, part of the precipitation is frozen and the other forms water droplets.

Characteristics of sleet precipitation

The term precipitation refers to water in any form that falls from the sky, sleet is a kind of solid precipitation that occurs at some stage in winter.

Sleet is formed by freezing raindrops or partially melted snowflakes as they fall through a layer of cold air.

Therefore, we can conclude that sleet is a form of winter precipitation, in which rain and snow occur at the same time.

Learn more about sleet here: https://brainly.com/question/25414642

Answer: C) Rain droplets

Explanation: Trust me.

What does it mean by solution in salt solution, sugar solution, etc.

Answers

Salt solution means water and salt mixed until dissolved.
Sugar solution means water and sugar mixed until dissolved.

Which adaptation allowed gymnosperm plants to out-compete spore-bearing plants? stems leaves roots seeds

Answers

your answer would be sm seeds

what would u add if the soil is too basic~~ ?​

Answers

Slaked lime is the ans

thank me later : p

6.23 X 10^6 KL + 5.34 × 10^6 kL

Answers

I’m standard form it will be 11570000 KL or in scientific notation 1.157x10^7

Why are earthworms called as “friends of farmers”? Answer in no less than 4 sentences

Answers

Answer:

Organic matter composted with earthworms, often known as vermicompost, has been demonstrated in studies to have disease-suppressing qualities. The earthworms loosen the soil and enrich it with humus. As a result, they are known as farmer's pals. They help the crops grow healthier and over the time have earned farmers trust.

Explanation:

Hope this helps in some way!

Name these ionic compounds
12. Ag3N
13. NaF
14. Ba
15. Na2S
16. AIBr;
17. LiN
18. KF
19. Srl2
20. Mgo
21. Al2O3
22. CaH2

Answers

12. silver nitride

13. Sodium fluoride

14. barium

15. sodium sulfide

16. aluminium bromide

17. lithium nitride

18. potassium sulfide

19. strontium iodide

20. magnesium oxide

21. aluminium oxide

23. calcium hydride

Elements that become cations during bonding become smaller as a result.
A.
True

B.
False

Answers

It’s False sorry if it’s wrong but I hope it help

what does the heisenberg uncertainty principle state

Answers

Answer: It states that there is a fundamental limit to what one can know about a quantum system.

Explanation:

How many grams of ammonia are produced from 6 moles of nitrogen?

Answers

How many grams of ammonia are produced from 6 moles of nitrogen?
Answer: The equation is 3H2 + N2 → 2NH3

If 6 moles of H2 gas react with N2 (assuming all reactants react)

6 * 2/3 moles of ammonia must be produced.

Therefore 4 moles of ammonia can be produced.

Since it is a gaseous equation (all reactants/products are gases), we can just assume that the Mr of the gases do not affect the amounts of the reactants or the products.

What does the electron configuration for the noble gases tell us about the elements in the
group

Answers

Answer:That all noble gases will have 8 valence electrons which makes a atom stable

Explanation:

Which non metal is highly reactive

Answers

Answer:

element fluorineThe most reactive nonmetals reside in the upper right portion of the periodic table. Since the noble gases are a special group because of their lack of reactivity, the element fluorine is the most reactive nonmetal.

It takes 60 mL of 0.20 M of sodium hydroxide (NaOH) to neutralize 25 mL of carbonic acid (H2CO3) for the following chemical reaction:


2 NaOH + H2CO3 → Na2CO3 + 2 H2O


The concentration of the carbonic acid is _____.

Answers

It requires 60 mL of 0.20 M sodium hydroxide [tex](NaOH)[/tex] to neutralize 25 mL of carbonic acid [tex](H_2CO_3)[/tex], hence the carbonate ions concentration is [tex]0.24M[/tex].

Given:

Reaction:

[tex]\to \bold{2NaOH + H_2CO_3 \to Na_2CO_3 + 2H_20 }[/tex]

[tex]NaOH[/tex] volume [tex](V_B) = 60 \ ml[/tex]  

[tex]H_2CO_3[/tex] Volume [tex](V_A) = 25\ ml[/tex]  

[tex]NaOH[/tex] Molarity [tex](C_B) = 0.20\ M[/tex]

[tex]H_2CO_3[/tex] moles [tex](n_A) = 1[/tex]

[tex]NaOH[/tex] moles [tex](n_B) = 2[/tex]

To find:

[tex]H_2CO_3[/tex] Molarity [tex](C_A) =?[/tex]

Solution:

Using the neutralization reaction:  

[tex]\to \frac{C_AV_A}{C_BV_B} =\frac{n_A}{n_B} \\\\[/tex]

[tex]\to C_B = 0.2\ M \\\\ \to n_A = 1 \\\\ \to n_B = 2 \\\\ \to V_B = 60\ ml \\\\ \to V_A = 25\ ml[/tex]

Calculating the [tex]C_A[/tex]:

 [tex]\to \frac{C_A \times 25}{0.2 \times 60} =\frac{1}{2} \\\\\to C_A =\frac{1 \times 0.2 \times 60}{2 \times 25} \\\\\to C_A =\frac{1 \times 2 \times 12}{2 \times 5 \times 10} \\\\ \to C_A =\frac{ 12}{ 5 \times 10} \\\\\to C_A = \frac{6}{5 \times 5} \\\\\to C_A = \frac{6}{25} \\\\\to C_A=0.24\ M[/tex]

Therefore, the concentration of carbonic acid is "0.24M".

Learn more about the concentration:  

brainly.com/question/9889034

The concentration of carbonic acid( H₂CO₃) is 0.24 M.

The given reaction:

2 NaOH + H₂CO₃ → Na₂CO₃ + 2H₂O

Volume of NaOH  = 60mL

Volume of H₂CO₃ = 25 mL

Molarity of NaOH= 0.20M

To find:

Molarity of H₂CO₃=?

2 moles of NaOH and 1 mol of H₂CO₃ reacts to give 1 mol of Na₂CO₃.

Using the neutralization reaction:  

Consider A to be NaOH and B to be  H₂CO₃

[tex]\frac{\text{Number of moles of A}}{\text{Number of moles of B}} =\frac{\text{Molarity of A*Volume of A}}{\text{Molarity of B*Volume of B}}[/tex]

On substituting the values in order to calculate molarity of H₂CO₃:

[tex]\text{Molarity of B}=\frac{1*0.2*60}{2*25} \\\\\text{Molarity of B}=0.24M[/tex]

Therefore, the concentration of H₂CO₃ is 0.24 M.

Learn more:

brainly.com/question/19943363

PLZZZZ HELP MEEE I WILL GIVE BRAINLYEST I need more then ever so can you can pls help a bro out I need this done in before 5:00 it 2:00 now

Answers

Answer:

If it becomes buried deep into the earth and it is open to increased temperate and pressure. Then an Igneous rock could be Metamorphic. This process can take a lot of time but eventually the rock will change due to pressure andbhigher temperatures.

The atomic mall mass is an element depends upon the.

Answers

Answer:

Mass and relative abundance of each isotope of that element

The atomic mass of element has been dependent on  mass of each isotopes and their abundance in nature.

The atomic mass has been the mass of neutrons and protons of the element. There has been the presence of the isotopes of the elements, with varying abundance, and varying atomic masses.

The atomic mass of the element has been the relative average atomic mass of the element with respect to the mass of the isotopes and their percent abundance.

The average atomic mass (amu) has been given by:

[tex]amu=M_1A_1\;+\;M_2A_2[/tex]

Where, [tex]M_1A_1[/tex] has been the atomic mass and abundance of isotope 1.

[tex]M_2A_2[/tex] has been the atomic mass and abundance of isotope 2.

Thus, the average atomic mass has been dependent on mass of each isotopes and their abundance in nature.

For more information about the atomic mass, refer to the link:

https://brainly.com/question/5566317

20 points be right this is my final!!!

Answers

I think it’s c hope it helps.

hydrofluoric acid
What’s the formula

Answers

Hydrofluoric acid/Formula

______________________

HF

______________________

o0o0o0o0o0o0o0o0o0o0o0

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