Answer:
there are 2970000cm in 29.7km
Explanation:
can two different elements have the same atomic symbol
Answer:
No.
Explanation:
They all are in sync.
Ex. 1 Hydrogen, 2 Helium, etc.
Which of the following are observations? Select all that apply.
A. Watching table salt dissolve in waters'
B. Feeling the sensation of ice held in the hand.
C. Smelling ammonia used in a cleaning solution.
D. Hearing a loud bang when a balloon filled with hydrogen gas is ignited.
E. Looking at the readout of a digital scale when measuring reagents for an experiment.
Answer:
A and E
Explanation:
Observing means looking or watching with the eyes etc..
Observation is the component of research and involves inspection of the hypothesis. Dissolving table salt and reading a digital scale is an example of observation. Thus, options A and E are correct.
What is an observation?Observation is that the component of the experimental style that defines observance or the review of the activity that underwent sure conditions.
It will be seen as a press release supported hearing, vision, etc. The dissolving of the flavorer is associate degree noticeable task wherever one will see the salt gets dissolved within the water to create a combination.
Similarly, the digital scales are used to measure the substances and use a readouts to estimate the quantity of the reagents to be used by directly seeing on the digital screen of the machine.
Therefore, dissolving salt and digital scale is observable.Hence options A and E are correct.
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2. Chemical changes often cannot be reversed because they
produce new chemical substances.
TRUE
FALSE
Answer:
True
Explanation:
Answer:
True...
I’ve tooken a test like that before
1) Chemistry is a (physical/biological) science?
Answer:
Explanation:
Biological.
I hope I helped you! :)
Please help asap!! Need help for problem #2.
Naturally occuring iron, contains 5.82% ^54Fe, 91.66% ^56Fe, 2.19% ^57Fe, and 0.33% ^58Fe. The reslective atomic masses are 53.940 amu, 55.935 amu, 56.935 amu and 57.933 amu. Calculate the average atmoic mass of iron. (show work)
Answer:
55.56 amu
Explanation:
Let A, B, C and D represent the four isotopes of iron.
The following data were obtained from the question:
Isotope A (Fe-54):
Mass of A = 53.940 amu
Abundance (A%) = 5.82%
Isotope B (Fe-56):
Mass of B = 55.935 amu
Abundance (B%) = 91.66%
Isotope C (Fe-57):
Mass of C = 56.935 amu
Abundance (C%) = 2.19%
Isotope D (Fe-58):
Mass of D = 57.933 amu
Abundance (D%) = 0.33%
Average atomic mass =.?
The average atomic mass of the iron can obtained as follow:
Average atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100] + [(mass of C × C%)/100] + [(mass of D × D%)/100]
Average atomic mass = [(53.940 × 5.82)/100] + [(55.935 × 91.66 )/100] + [(56.935 × 2.19)/100] + [(57.933 × 0.33)/100]
= 2.848 + 51.270 + 1.247 + 0.191
= 55.56 amu
Therefore, the average atomic mass of the iron is 55.56 amu
Making a Lis changing something to improve your work. A) scenario
B) revision
C) entry event
D) wish list
I can sort the way each object moves by
Answer:
By the way they move
Explanation:
hope this helps
3. Calculate each of the following:
a) kg of 4.6x1021 molecules of nitrogen dioxide
b) moles of chlorine atoms in 0.615 g of C2H4Cl2
c) number of hydride ions in 5.82 g of strontium hydride
Answer:
the answers are at the very bottom of each picture
Explanation:
i really hope this helps you:)
55:55
The MSDS for benzene indicates that it is a clear liquid that has a substantial vapor pressure. It has a health rating of
2, a fire rating of 3, and a reactivity rating of O. It is a cancer-causing agent.
Based on this information, which statement about benzene is accurate?
O Benzene readily reacts with moist air.
O Benzene explodes if the container is shaken.
O Benzene must be kept away from flames.
O Benzene must be stored under high pressure.
Answer:
Benzene must be kept away from flames.
Explanation:
Hello,
In this case since MSDS tables show the potential risks of chemical compounds, for benzene which which has a substantial vapor pressure and a fire rating of 3, which means that is highly flammable (very likely to get on fire), we conclude then that benzene must be kept away from flames due to its high risk. The other options are incorrect since it has 0 reactivity, it is nor fragile so it is not affected by shaking and it could be storage at standard pressures since it is a liquid at standard conditions as well.
Regards.
What are the steps to solving: 0.8102m x 3.44m
Answer:
2.787088m^2
Explanation:
well you multiply both numbers and then since its multiplication you can add both variables and there two
The steps for solving: 0.8102m x 3.44m is given below in explanation part, and the answer for this is [tex]2.788088m^2[/tex].
To begin solving the 0.8102m multiplied by 3.44m multiplication issue, multiply the numerical numbers together: 0.8102 x 3.44 = 2.788088.
Then add the units together: m x m = [tex]m^2[/tex]. Finally, add the numerical value and unit to get the following result: 2.788088 [tex]m^2[/tex].
We are multiplying two measures by metres (m) in this computation. When we multiply the numerical values, we get the product, and when we multiply the units, we get the final unit, which in this case is metres squared ( [tex]m^2[/tex]).
Thus, this signifies that the multiplication reflects a computation of area. The final value, 2.788088 [tex]m^2[/tex], is the product of multiplying the two measures supplied.
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To create increased pressure in the lungs which of the following muscles might be active? Mark all that apply. (A) External Intercostals (B) Internal Intercostals (C)Pectoralis major (D) Abdominal muscles (E) Diaphragm (F) Serratus anterior
Answer:
the diaphragm,the rib cage muscles and the abdominal muscles.
Explanation:
From a functional point of view, there are three groups of respiratory muscles: the diaphragm, the rib cage muscles and the abdominal muscles. Each group acts on the chest wall and its compartments, i.e. the lung-apposed rib cage, the diaphragm-apposed rib cage and the abdomen.
You have 723 ml of 3.99 M HCl. Using a volumetric pipet, you take 326 ml of that solution and dilute it to 976 ml in a volumetric flask. Now you take 100.00 ml of that solution and dilute it to 119 ml in a volumetric flask. What is the concentration of hydrochloric acid in the final solution
Answer:
1.12M
Explanation:
The initial concentration of the HCl solution is 3.99M. You are doing 2 dilutions:
In the first you take 326mL and dilute the solution to 976mL; that means you are diluting the solution:
976mL / 326mL = 2.99 times.
The concentration of this solution is:
3.99M / 2.99 = 1.33M
Now, in the second dilution, you take 100mL of the diluted solution and dilute it to 119mL. The concentration of this final solution is:
119mL / 100mL = 1.19 times.
1.33M / 1.19 =
1.12MThe final concentration of hydrochloric acid present is 1.11 M.
In the first dilution;M1V1 = M2V2
M2 = 3.99 M × 326 ml/976 ml
M2 = 1.33 M
In the second dilution:
M1V1 = M2V2
M2 = 1.33 M × 100.00 ml/119 ml
M2 = 1.11 M
Hence, the final concentration of hydrochloric acid present is 1.11 M.
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What happens to the principle energy level number when moving from s to p sub levels
Answer:
The principal energy level remains the same
Explanation:
A principal energy level is one defines where electrons reside in an atom and that can contain one or more sub levels and have 2·n² number of electrons located in different sub levels within the energy level. Therefore, when moving up from s to p within the same principal energy level, the principal energy level does not change value.
Consider this aqueous reaction.
HNO3(aq) + Ba(OH),(aq)
What is the formula for the salt that forms?
Answer:
Ba(NO3)2 barium nitrate
Explanation:
2HNO3+Ba(OH)2=Ba(NO3)2+2H2O
acid base salt water
what ahppens when you free lava?
Answer:
It will melt everything and if lava goes into water it will become rock.
Hope this helped you!
Explanation:
Which of the following is a savanna? a. Veldts b. Plains c. Steppes d. Llanos
Answer:
d) Llanos
Explanation:
Answer:
D . Llanos
Explanation:
the study of Mixture
Answer:
Mixtures can be either homogeneous or heterogeneous. A mixture in which its constituents are distributed uniformly is called homogeneous mixture, such as salt in water. A mixture in which its constituents are not distributed uniformly is called heterogeneous mixture, such as sand in water.
Explanation:
Which statement correctly defines pasteurization?
Answer:
Pasteurization is the process by which liquids are heated to kill bacteria that may be present.
explanation I got the correct answer
Answer:
Pasteurization is the process by which liquids are heated to kill bacteria that may be present.
Explanation:
i just did that one
Convert .0027 CL to mL.
Answer:
0.027 ml
Explanation:
[tex]1\:cl = 10\:ml\\0.0027 \: cl = x\:ml[/tex]
Cross Multiply
[tex]x = 0.027 \:ml[/tex]
Which option gives an object's volume in SF units?
O
A. 4.3 kg
B. 2.6 m3
C. 5.5 K
D, 3.4L
SUBMIT
Answer:
The correct answer is:
2.6 m3 (B)
Explanation:
SF unit stands for Stowage factor unit. Stowage factor is the volume occupied by one unit of mass (weight) when stowed in cargo space. SF expresses the unit in cubic meters (m³) or cubic feet. SF is a unit of measurement that indicates how much space (volume) a particular unit of cargo occupies in a ship's cargo compartment
HELP 100 POINTS WILL MARK BRAINLIEST In ancient times, early astronomers watched stars travel across the sky in one direction for several months, then over the course of a few weeks the stars would reverse course and move in the opposite direction. After these few weeks, the stars would reverse direction again and resume their original course. The ancient astronomers called these “wanderer stars”. After more research was done, it was found that these “wanderer stars” were actually other planets. As more data was collected, it was shown that all planets move at different speeds as they travel in their orbits around the Sun. As the Earth moves in its orbit, it moves faster than some planets and slower than others. This causes the Earth to “pass” some planets as it travels, which results in the appearance that the other planets move backwards. Is this a description of a scientific law or scientific theory? 100 points PLEASE HELP
The measure of the amount of matter is known as _______?
Answer:
Mass is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g).
Enter the full electron configuration for S2�. What is the atomic symbol for the noble gas that also has this electron configuration?
Answer:
1. Electronic configuration of sulphide ion S²¯ (18) => 1s² 2s²2p⁶ 3s²3p⁶
2. Ar
Explanation:
1. S²¯ simply indicates that the sulphur atom (S) has gained two extra electrons.
Thus we shall write electron configuration of sulphur (S) and sulphide ion (S²¯) as follow:
The electronic configuration of S²¯
S (16) => 1s² 2s²2p⁶ 3s²3p⁴
S²¯ (18) => 1s² 2s²2p⁶ 3s²3p⁶
2. Determination of the noble gas element that has the same electronic configuration as S²¯.
This is illustrated below:
Sulphur (S) has 16 electrons while the sulphide ion (S²¯) has extra 2 electrons making it to have a total electron of 18. Observing the elements in the periodic table, only Argon has 18 electrons with electronic configuration as:
Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶
Therefore, sulphide ion (S²¯) has the same electronic configuration as Argon (Ar).
What is a nebula? ...........................
a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
a clouded spot on the cornea causing defective vision.
Hope this helped
Answer:
A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
Explanation:
Which set of elements has 4 valence electrons?
Answer:
carbon group
All the carbon group atoms, having four valence electrons, form covalent bonds with nonmetal atoms; carbon and silicon cannot lose or gain electrons to form free ions, whereas germanium, tin, and lead do form metallic ions but only with two positive charges.
The set of elements that has 4 Valence electrons are the carbon group.
What are valence electrons?Valence electrons are those electrons that are found at the outermost shell of an element that can go into formation of chemical bonds with another element on a chemical reaction.
The group 14 elements in the periodic table are known to have a four Valence electron on their outermost shell.
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The formula for a compound containing sodium and oxide ions would contain... This
compound would have an overall ... charge.
Answer:
Explanation:
the formula of the compound containing sodium and oxide ion is
NaOH the charge on sodium is partial positive and the charge on hydroxide ion is partial negative
another compound containing sodium and oxide ion is Na2O here the charge on sodium oxide is neutral
How many significant figures are in the following numbers?
a. 0.002849
b. 40030
An open-topped tub is filled completely to the top edge with solid ice. What will happen when the ice melts?
A)
The tub will overflow.
B)
In the process of melting, 9 percent of the water will be converted to water vapor.
C)
The level of the water will be lower than the edge of the tub.
D)
There will be no change in the level of the tub.
Answer:
d
Explanation:
Answer:
B
Explanation:
The elements carbon, hydrogen, oxygen, and nitrogen make up which percentage of the human body?
Answer:
96% Hope it helps
Explanation:
Roughly 96% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen and nitrogen, with a lot of that in the form of water. The remaining 4% is a sparse sampling of the periodic table of elements.
Help me please, i’d appreciate it a lot! thank you!❤️
Explanation:
think so it is useful and sufficient for your question