Answer:
If the atom has more electrons than protons, it is a negative ion, or ANION. If it has more protons than electrons,it is a positive ion.
Explanation:
so yes true
An object was measured by a worker as 35.6cm long, however, the manufacturer specifications list the length of the object at 35.0cm. What is the percent error In the workers measurement?
Answer:
----1.71%----
Review the desert food web above. What organism, absent in the web, would be MOST responsible for recycling organic matter back through the food web?
A) cougars
B) bacteria
C) sage brush
D) cactus plants
What is the number of electrons in the outermost energy level of an oxygen atom?
Answer:
6 electrons.
Explanation:
An atom of oxygen has six electrons in its outermost energy level, and these are called valence electrons.
how many sig figs are there? 306.2
Answer:
There are four significant figures in given measurement.
Explanation:
Significant figures:
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
In given measurement 306.2 there are 4 significant figures.
3,0,6,2
All digits are significant.
how are atoms structured
Answer:
they got protons, electrons, and neutrons
Explanation:
Answer:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
Explanation:
Which best compares freezing and condensation?
Both involve changes between liquids and gases.
Both involve changes between gases and solids.
Both involve the release of heat.
Both involve the absorption of heat.
According to the forces of attraction, the statement which best compares freezing and condensation is that both involve the release of heat.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which of these statements about half-life is true? Check all that apply. Half-lives vary dramatically from isotope to isotope. A relationship exists between isotopes and half-lives. Half-lives are constant for a particular isotope. Half-life is an exact measure of when individual atoms will decay. Temperature, pressure, and density affect the half-life of an isotope.
Answer:
Half-lives vary dramatically from isotope to isotope. Half-lives are constant for a particular isotope.
Explanation:
A,C
The correct statement about half life time is half lives vary dramatically from isotope to isotope and it is constant for a particular isotope.
What is half life time?Half life time of any reaction is that time where the concentration of product will become half of the initial concentration of reactant.
Half life time is not same for every substance it will vary from substance to substance. And for any particular substance half life time is constant untill the whole degradation of that substance. Half ife time is not depends on temeprature and pressure because it is not the rate.
Hence, half life time is constant for particular isotope and vary from isotope to isotope.
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PLEASE HELP I ONLY HAVE 5 MINS LEFTTTT
You want to get more physically fit but often make excuses for why you don't have time to be active. What strategy can help with this problem? (3 points)
a
Find an activity you enjoy and make it a priority in your schedule
b
Wait to exercise until you are in the mood so you won't make excuses
c
Cut back on calories on days you are not motivated to be physically active
d
Only exercise at the end of the day so you are consistent every day
Answer: A
Explanation:
Answer choices B and C both involve some form of procrastination. In the question it states what is the BEST strategy and I think that that would be doing something you like to do so you don’t make excuses to not do it.
Answer:
a
Explanation:
its the only reasonable one
Question 7 of 25
Lighting a match is an example of what kind of energy conversion?
O A. Chemical potential energy being converted to heat energy
B. Kinetic energy being converted to chemical potential energy
C. Chemical potential energy being converted to kinetic energy
D. Gravitational potential energy being converted to heat energy
Answer:
A
Explanation:
APEX
Lighting a match is an example of chemical potential energy being converted to heat energy. The correct option is A.
What is the conversion of energy?Conversion of energy is when the energy is converted from one form into another form. When chemical or physical reactions occur, there is always a conversion of energy from one form to another.
When we match a light, there is a chemical, Phosphorous sulfide which is rubbed against other chemical, and react and produce fire, so it is converted into heat energy.
Thus, the correct option is A. Chemical potential energy is converted to heat energy regarding lighting a match.
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Which of these is a compound? оо CO2 o 02 O CO
How many atoms are
below?
C6H1206
Answer:
24 atoms
Explanation:
6 Carbon atoms
12 Hydrogen atoms
6 Oxygen atoms
Can someone answer the bottom question (22-25)
The mass on the periodic table is called
how many moles of xenon gas, Xe, would occopy 37.8L at stp
Answer:
The number of moles of xenon are 1.69 mol.
Explanation:
Given data:
Number of moles of xenon = ?
Volume of gas = 37.8 L
Temperature = 273 K
Pressure = 1 atm
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will put the values in formula.
1 atm × 37.8 L = n × 0.0821 atm.L/ mol.K ×273 K
37.8 atm.L = n × 22.413 atm.L/ mol.
n = 37.8 atm.L / 22.413 atm.L/ mol.
n = 1.69 mol
The number of moles of xenon are 1.69.
Show work
7. How many mm are there in 2.3Mm?
8. Copper has a density of 6.55g/cmº. A. piece of metal has a mass of 48.3g and a volume of 7.2cm.
Is this metal copper?
9. What is the mass of a liquid whose volume is 6.0 mL and a density of 1.3 g/cm??
10. You have 3.50 L of a liquid, whose density is 2.3g/cm3. What is it's Mass?
Answer:
7 = 2.3× 10⁺⁹ mm
8 = The density of copper is 6.55g/cm³ so the given metal is not copper.
9 = mass of liquid is 7.8 g
10 = mass of liquid is 8050 g.
Explanation:
7. How many mm are there in 2.3Mm?
mm is the symbol of millimeter.
Mm is the symbol of megameter.
1 mm = 10⁻⁹Mm
so in order to convert 2.3Mm into mm we will multiply the given value with 10⁺⁹
2.3 mm × 10⁺⁹ = 2.3× 10⁺⁹ mm
8. Copper has a density of 6.55g/cmº. A. piece of metal has a mass of 48.3g and a volume of 7.2cm.
Is this metal copper?
Given data:
Density of copper = 6.55 g/cm³
Mass of metal = 48.3 g
Volume of metal = 7.2 cm³
Is the metal is copper = ?
Solution:
The given problem will be solved through the density formula.
D = m/v
We will put the values in formula to calculate the density.
d = 48.3 g/ 7.2 cm³
d = 6.71 g/cm³
The density of copper is 6.55g/cm³ so the given metal is not copper.
9. What is the mass of a liquid whose volume is 6.0 mL and a density of 1.3 g/cm??
Given data:
Volume of liquid = 6.0 mL (1 mL = 1cm³)
Density of liquid = 1.3 g/cm³
Mass of liquid = ?
Solution:
Formula:
D = m/v
By putting the values in formula.
1.3 g/cm³ = m / 6 cm³
m = 1.3 g/cm³ × 6 cm³
m = 7.8 g
mass of liquid is 7.8 g.
10. You have 3.50 L of a liquid, whose density is 2.3g/cm3. What is it's Mass?
Given data:
Volume of liquid = 3.50L (3.50 ×1000 = 3500 cm³)
Density of liquid = 2.3g/cm³
Mass of liquid = ?
Solution:
Formula:
D = m/v
By putting the values in formula.
2.3g/cm³ = m /3500cm³
m = 2.3 g/cm³ × 3500 cm³
m = 8050 g
mass of liquid is 8050g.
A jet engine might use _____.
rapid combustion
respiration
slow combustion
nitrous oxide
Answer:
A jet engine might use rapid combustion.
Hope this helps!
Have a great day! :))))
I know this because i had this on a test yesterday and got it right.
Calculate the number of water molecules formed of 0.562 moles of oxygen gas in
2 H2 (g) + 1 O2 (g) ⟶ 2 H2O (g)
Answer:
6.77 · 10²³ molecules H₂O
Explanation:
Step 1: Define
2H₂ (g) + O₂ (g) → 2H₂O (g)
0.562 mol O₂
Step 2: Use Stoichiometry
[tex]0.562 \hspace{3} mol \hspace{3} O_2(\frac{2 \hspace{3} mol \hspace{3} H_2O}{1 \hspace{3} mol \hspace{3} O_2} )[/tex] = 1.124 mol H₂O
[tex]1.124 \hspace{3} mol \hspace{3} H_2O(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} H_2O}{1 \hspace{3} mol \hspace{3} H_2O} )[/tex] = 6.76648 · 10²³ molecules H₂O
Step 3: Simplify
We have 3 sig figs.
6.76648 · 10²³ molecules H₂O ≈ 6.77 · 10²³ molecules H₂O
Who's model was titted the atomic theory of matter"? *
Answer:
John Dalton
Explanation:
Answer:
John Dalton, an English chemist, inferred that atoms had certain characteristics. He began to propose an atomic the- ory and model for atoms. The main ideas of Dalton's theory are summarized in Figure 2. With only a few changes, Dalton's atomic theory is still accepted today.
Explanation:
uranium in the isotope below had 140 nutrons
Answer:
It has 140 neutrons because Mass number= No of protons + no of neutrons
An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?
A)Calcium, because it is an alkaline earth metal with two inner shell electrons. B)Carbon, because it has two electrons in its outermost p sub level.
C)Lithium, because it is a group 1 element with two bonding electrons. D)Magnesium, because it is a group 2 element with two valence electrons.
Answer:
The answer is D, Magnesium.
5. Common (most stable) mass numbers of the following elements are Al-27, Pt-195, Co-59,
Ag-108, and Au-197 respectively. Shorthand notation is written with a mass number on the
top and atomic number on the bottom of the element symbol. Check letters a-d in 4 above
and use those as examples to write the shorthand notation of the following elements and
determine the number of neutrons in each element.
Aluminum
Platinum
Cobalt
Silver
Gold
Answer:
Number of neutrons of Al²⁷₁₃ = 14
Number of neutrons of Pt¹⁹⁵₇₈= 117
Number of neutrons of Co⁵⁹₂₇= 32
Number of neutrons of Ag¹⁰⁸₄₇= 61
Number of neutrons of Au¹⁹⁷₇₉ = 118
Explanation:
We know that atomic number of an atom is number of electron or protons while atomic mass is sum o number of neutrons and and protons.
Shorthand notations of given elements:
Al²⁷₁₃
This notation shows that atomic number of Al-27 is 13 and atomic mass is 27.
Number of neutrons of Al²⁷₁₃ = 27 - 13
Number of neutrons of Al²⁷₁₃ = 14
Pt¹⁹⁵₇₈
This notation shows that atomic number of Pt-195 is 78 and atomic mass is 195.
Number of neutrons of Pt¹⁹⁵₇₈ = 195 - 78
Number of neutrons of Pt¹⁹⁵₇₈= 117
Co⁵⁹₂₇
This notation shows that atomic number of Co-59 is 27 and atomic mass is 59.
Number of neutrons of Co⁵⁹₂₇ = 59 - 27
Number of neutrons of Co⁵⁹₂₇= 32
Ag¹⁰⁸₄₇
This notation shows that atomic number of Ag-108 is 47 and atomic mass is 108.
Number of neutrons of Ag¹⁰⁸₄₇ = 108 - 47
Number of neutrons of Ag¹⁰⁸₄₇= 61
Au¹⁹⁷₇₉
This notation shows that atomic number of Au-197 is 79 and atomic mass is 197.
Number of neutrons of Au¹⁹⁷₇₉ = 197 - 79
Number of neutrons of Au¹⁹⁷₇₉ = 118
Can a single atom be considered a molecule?
Answer: no
Explanation:
Answer: yes it can
Explanation: hope it help
Please help me with this question
Answer:
it absorbed it
Explanation:
it going up shows that it absorbed thermal energy because that's the temperature. when temperature goes up thermal energy comes in
An ion has 14 protons, 15 electrons, and 14 neutrons. What charge does this ion have?
Answer:
it would have A positive charge
A teacher asked her students how a cruise ship has such a large mass is able to float in the ocean?
Cruise ships may weigh hundreds of thousands of tons, but they're still some of the best floaters out there. Of water equal to their mass (the wide, U-shaped hull helps with this). But a boat actually has a lot of open space. After all, the ocean is massive—and extremely dense. All Consent Allowed.
A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.
What will most likely happen next?
Scientists worldwide will reject atomic theory because of the new results.
The scientist will change his results to agree with the accepted theory.
Other scientists will reject the results because they do not agree with the theory.
The scientist will repeat the experiment to make sure that his results are reliable.
Answer:
When the results of a new experiment to test atomic theory do not agree with the theory, scientist will repeat the experiment to make sure that his results are reliable.
Explanation:
In the scientific context, each new experiment must be performed with precision and following the steps of the scientific method.
An experiment that does not provide reliable data to demonstrate a theory must be reviewed in detail and performed again to confirm the data obtained in the first attempt.
A theory is a postulate that tries to explain a natural phenomenon, but whose argument can be discussed or does not have the acceptance of a law. When the theory is proven and there are no arguments against it, it can be universally accepted and becomes a law.
The other options are not valid due to:
Scientists worldwide will reject atomic theory because of the new results. A theory cannot be discarded without solid arguments or evidence in order to dismiss it and establish a new one.The scientist will change his results to agree with the accepted theory. This would be an unethical procedure and unacceptable to the scientific community.Other scientists will reject the results because they do not agree with the theory. The opinion of other scientists is not enough to dismiss a theory, if it has a valid scientific basis.Answer:
When the results of a new experiment to test atomic theory do not agree with the theory, scientist will repeat the experiment to make sure that his results are reliable.
Explanation: CAUSE I COPPIED HIM SORRY OTHER MAN NEEDED THE POINTS
Leslie wants to know which advertising medium works best to promote her electronics store. She surveys her customers over a weekend and creates a bar graph. Based on her survey, which advertising mediums will work best to publicize Leslie’s in-store specials
Answer:
option 4=d
Explanation:
the internet and printed flyers have the highest score on the bar graph therefor the two are the best bet and the correct option
R is the midpoint of FG.
FR = 26 find RG
Answer:
52
Explanation:
This is because if R is the midpoint of FRG, FR is half of FRG, so basically all you do it multiply by 2 to get the FRG
a certain atom has a green spectrum line of about 540 nm. what is the difference in energy between the two energy levels responsible for producing the line?
Answer:
[tex]\Delat E=3.7\times 10^{-19}\ J[/tex]
Explanation:
The difference in energy between the two energy levels is given by :
[tex]\Delta E=\dfrac{hc}{\lambda}[/tex]
Where,
h is Planck's constant
c is speed of light
[tex]\lambda[/tex] is wavelength
So,
[tex]\Delta E=\dfrac{6.67\times 10^{-34}\times 3\times 10^8}{540\times 10^{-9}}\\\\\Delta E=3.7\times 10^{-19}\ J[/tex]
So, the energy difference is [tex]3.7\times 10^{-19}\ J[/tex].
The difference in energy between the two energy levels that is responsible for producing the green spectrum line is equal to [tex]3.68 \times 10^{-19}\; Joules[/tex].
Given the following data:
Wavelength = 540 nm = [tex]540 \times 10^{-9} meters[/tex]Speed of light = [tex]3 \times 10^8\;meters[/tex]
Planck constant = [tex]6.626 \times 10^{-34}\;J.s[/tex]
To determine the difference in energy between the two energy levels that is responsible for producing the green spectrum line, we would apply Einstein's equation for photon energy:
Mathematically, Einstein's equation for photon energy is given by the formula:
[tex]\Delta E = hf = h\frac{v}{\lambda}[/tex]
Where:
[tex]\Delta E[/tex] is the change in energy.h is Planck constant.f is photon frequency.[tex]\lambda[/tex] is the wavelength.v is the speed of light.Substituting the given parameters into the formula, we have;
[tex]\Delta E = \frac{6.626 \times 10^{-34} \;\times \;3.0 \times 10^{8}}{540 \times 10^{-9}} \\\\\Delta E = \frac{1.99 \times 10^{-25}}{540 \times 10^{-9}}\\\\\Delta E = 3.68 \times 10^{-19}\; Joules[/tex]
Note: [tex]1 \;nanometer = 1 \times 10^{-9} \;meter[/tex]
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3 mL is equal to:
a.3 cm 2
b.3L
c.3 cm 3
Answer:
C
Explanation:
1mL = 1cm
3 * 1 = 3cm³
We use "³" because we are working with units that represent volume.
Best of Luck!
