Answer:
A
Explanation:
because in neutral proton equals to electron
The correct option is A. Potassium has 19 protons, 20 neutrons, and 19 electrons.
What is potassium?
Potassium is an element. It has protons and electrons. potassium has a nucleus. The nucleus contains protons and neutrons. Electrons revolve around the nucleus.
Proton is a positively charged atom and an electron is negatively charged and revolves around the atom. Neutron is neutral in charge.
The atomic number of potassium is 19. So it has 19 protons and 20 neutrons and 19 electrons.
Therefore, The correct option is A. Potassium has 19 protons, 20 neutrons, and 19 electrons.
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A cube with sides 4cm. It's mass is 54g. will it sink or float ?
If I put you on a goat
Put you in some water
Now you’re gonna float
An atom's mass number equals the number of
Answer:
Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
Explanation:
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A skateboarder is shown below.
At which point is the skateboarder's potential energy the greatest?
A. W
B. X
C. Y
D. Z
Answer:
W I think good luck I think
Answer: w
Explanation: potential energy is greater when higher from the ground. i took the test
Idontknow I NEED HELP SOME1!!!! :)
Which statement correctly classifies gamma emission?(1 point)
Gamma emission is not a type of radioactive decay or a fission reaction.
Gamma emission is not a type of radioactive decay, but it is a fission reaction.
Gamma emission is a type of radioactive decay, but it is not a fission reaction.
Gamma emission is a type of radioactive decay that is also a fission reaction.
Answer:
Gamma emission is a type of radioactive decay, but it is not a fission reaction.
Explanation:
BOOM
Sexual reproduction occurs when two specialized sex cells also known as _____________, fuse together.
Answer:
Explanation:
During sexual reproduction the two gametes join together in a fusion process known as fertilization, to create a zygote, which is the precursor to an embryo offspring, taking half of its DNA from each of its parents. In humans, a zygote contains 46 chromosomes: 23 from its mother and 23 from its father
Viết cấu trúc Lewis và công thức cấu tạo cho các phân tử sau: MgO; HNO3; H2SO4. Giải thích liên kết trong các phân tử trên thuộc loại liên kết gì? Xác định mức độ ion trong liên kết MgO.
Answer:
hydrogen cloride
Explanation:
How large are dwarf galaxies compared to the Milky Way galaxy?
Question 1 options:
the same size
about 1/5 the size
about 1/10 the size
billions of time smaller
Billions of time smaller
A 10.0 cm sample of copper has a mass of 89.6 g. What is the density?
Answer:
19.3 g/cm3
A 10.0 cm3 sample of copper has a mass of 89.6 g. What is the density of copper? 19.3 g/cm3
An excess of sodium carbonate, Na, CO3, in solution is added to a solution containing 17.87 g CaCl2. After performing the
experiment, 13.19 g of calcium carbonate, CaCO3, is produced. Calculate the percent yield of this reaction.
Answer:
Approximately [tex]81.84\%[/tex].
Explanation:
Balanced equation for this reaction:
[tex]{\rm Na_{2}CO_{3}}\, (aq) + {\rm CaCl_{2}} \, (aq) \to 2\; {\rm NaCl}\, (aq) + {\rm CaCO_{3}}\, (s)[/tex].
Look up the relative atomic mass of elements in the limiting reactant, [tex]\rm CaCl_{2}[/tex], as well as those in the product of interest, [tex]\rm CaCO_{3}[/tex]:
[tex]\rm Ca[/tex]: [tex]40.078[/tex].[tex]\rm Cl[/tex]: [tex]35.45[/tex].[tex]\rm C[/tex]: [tex]12.011[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass for both the limiting reactant and the product of interest:
[tex]\begin{aligned}& M({\rm CaCl_{2}}) \\ &= (40.078 + 2 \times 35.45)\; {\rm g \cdot mol^{-1}} \\ &= 110.978\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
[tex]\begin{aligned}& M({\rm CaCO_{3}}) \\ &= (40.078 + 12.011 + 3 \times 15.999)\; {\rm g \cdot mol^{-1}} \\ &= 100.086\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
Calculate the quantity of the limiting reactant ([tex]\rm CaCl_{2}[/tex]) available to this reaction:
[tex]\begin{aligned}n({\rm CaCl_{2}) &= \frac{m({\rm {CaCl_{2}})}}{M({\rm CaCl_{2}})} \\ &= \frac{17.87\; \rm g}{110.978\; \rm g \cdot mol^{-1}} \\ &\approx 0.161023\; \rm mol \end{aligned}[/tex].
Refer to the balanced equation for this reaction. The coefficients of the limiting reactant ([tex]\rm CaCl_{2}[/tex]) and the product ([tex]{\rm CaCO_{3}}[/tex]) are both [tex]1[/tex]. Thus:
[tex]\displaystyle \frac{n({\rm CaCO_{3}})}{n({\rm CaCl_{2}})} = 1[/tex].
In other words, for every [tex]1\; \rm mol[/tex] of [tex]\rm CaCl_{2}[/tex] formula units that are consumed, [tex]1\; \rm mol\![/tex] of [tex]\rm CaCO_{3}[/tex] formula units would (in theory) be produced. Thus, calculate the theoretical yield of [tex]\rm CaCO_{3}\![/tex] in this experiment:
[tex]\begin{aligned} & n(\text{${\rm CaCO_{3}}$, theoretical}) \\ =\; & n({\rm CaCl_{2}}) \cdot \frac{n({\rm CaCO_{3}})}{n({\rm CaCl_{2}})} \\ \approx \; & 0.161023\; {\rm mol} \times 1 \\ =\; & 0.161023\; \rm mol\end{aligned}[/tex].
Calculate the theoretical yield of this experiment in terms of the mass of [tex]\rm CaCO_{3}[/tex] expected to be produced:
[tex]\begin{aligned} & m(\text{${\rm CaCO_{3}}$, theoretical}) \\ = \; & n(\text{${\rm CaCO_{3}}$, theoretical}) \cdot M(({\rm CaCO_{3}}) \\ \approx \; & 0.161023\; {\rm mol} \times 100.086\; {\rm g \cdot mol^{-1}} \\ \approx \; & 16.1161\; \rm g \end{aligned}[/tex].
Given that the actual yield in this question (in terms of the mass of [tex]\rm CaCO_{3}[/tex]) is [tex]13.19\; \rm g[/tex], calculate the percentage yield of this experiment:
[tex]\begin{aligned} & \text{percentage yield} \\ =\; & \frac{\text{actual yield}}{\text{theoretical yield}} \times 100\% \\ \approx \; & \frac{13.19\; {\rm g}}{16.1161\; {\rm g}} \times 100\% \\ \approx \; & 81.84\%\end{aligned}[/tex].
Suggest the stable ion for phosphorus and why?
Phosphorous has 5 valence electrons and so gaining 3 electrons will make it isoelectronic with the stable noble gas argon, and will produce the P3- ion
Evidence of chemical reactions include changes in
Answer:
color, state, odor
Explanation:
Liquids _____.
a. take the shape of the container and
b. have a definite volume
c. have definite shape and a definite volume have no shape and no definite volume
d. none of the above
Answer:
It takes the shape of a container.
If you place rice on top or a speaker, what will happen to the rice when you turn the speaker on?
The rice will begin to move.
The rice will do nothing
Answer:
The rice will move
Explanation:
the sound vibration and waves will cause the rice to move
Answer:
The rice will begin to move.
Explanation:
Which statement is the best explanation for why two negatively charged balloons move apart without ever touching?
1)Electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
2)Electrons from one balloon jump to the other and push it, without ever touching it.
3)The space between objects is actually filled with charged particles that all interact.
4)Charged objects send little lightning bolts of electrons across the space between the two balloons.
Answer:
Answer is 1: Electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
Option 1 offers the best justification for why two negatively charged balloons travel apart but never touch: Electric charges may exert pressures on other things without ever contacting them because of the electric fields that surround them.
What is the way of generating electric field ?This is because electric charges generate electric fields that, even when they are not in contact with other things, may push and pull on them. This is because electric fields—invisible lines of force that emerge from an electric charge and radiate out—can interact with other electric charges as well as physical things.
One balloon's electric field will interact with the electric field of the second balloon, pushing the two balloons apart. Because electrons do not leap from one balloon to another, Option 2 is inaccurate.Because electrons do not leap from one balloon to the next, Option 2 is untrue. Instead, the balloons are forced apart by the interaction of the electric fields.
Option 3 is erroneous because charged particles do not fill the void between the items. Instead, the electric charges cause electric fields to fill the area. Option 4 is erroneous because charged objects do not transmit tiny electron lightning bolts across the space between the two balloons, which brings us to our last error.
Instead, the balloons are forced apart by the interaction of the electric fields.
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Is medicine, such as the aspirin shown in the image above, an example of science or technology?
Answer:
Technology
hope this helps
If the reaction occurs between Fe2S3(s) and H+ (aq) and the equation is properly balanced with the smallest
whole-number coefficients, what is the sum of the coefficients for all reactants and products?
Fe2S3(s) + H+ (aq)
The sum of the coefficients for all reactants and products is: 12.
Here, we first need to balance the equation of the reaction between Fe2S3(s) and H+.
The chemical equation yields H2S and Fe3+ as follows;Fe2S3(s) + H+ (aq) ------> H2S + Fe3+(aq)Balancing the equation consequently yields;Fe2S3(s) + 6H+ (aq) ------> 3H2S + 2Fe3+(aq)The sum of the coefficients for all reactants and products is therefore;
Sum = 1 + 6 + 3 + 2.
Sum of coefficients = 12
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Try to compare the landscape differences between the surface of the moon and the surface of the earth.
Answer:
eat this
Explanation:
calculate the number of collision/sec/cm3 for argon at STP given that it's molecular diameter is 0.20nm
We need collisonal section area
[tex]\\ \sf\longmapsto \sigma=2d[/tex]
[tex]\\ \sf\longmapsto \sigma=2(0.20nm)[/tex]
[tex]\\ \sf\longmapsto \sigma=0.4nm[/tex]
how many millilters of a 6.00 M sulfuric acid solution are reqired if you need 0.750 moles of H2SO4 for a reaction
125 milliliters of a 6.00 M sulfuric acid solution are required if 0.750 moles of H2SO4 are needed for a reaction.
HOW TO CALCULATE VOLUME:
The volume of a solution can be calculated by dividing the number of moles of that solution by its molar concentration. That is:Volume = no. of moles ÷ molarityAccording to this question, the molarity is given as 6.00 M sulfuric acid solution and the no. of moles is 0.75 moles. The volume is calculated thus:Volume = 0.75mol ÷ 6MVolume = 0.125LVolume of sulfuric acid in milliliters = 0.125 × 1000 = 125mLTherefore, 125 milliliters of a 6.00 M sulfuric acid solution are required if 0.750 moles of H2SO4 are needed for a reaction.Learn more at: https://brainly.com/question/2817451?referrer=searchResults
In this experiment, between 1.900-2.100 g of a mixture containing the reactants zinc sulfate and sodium phosphate was added to acidified water to undergo a double displacement (precipitation) reaction. This mixture had an unknown percent composition of reactants. To make matters more complicated, the unknown mixture did NOT contain stoichiometric quantities of the reactants.
1. (1 point) Write a molecular equation for the reaction of aqueous zinc sulfate and aqueous sodium phosphate.
2.How could you identify an element by its
number of protons?
hich is the percent per mass of 2 grams of cumin powder mixed in 50 mL milk?
3. 51%
4%
3. 49%
5%
Answer:
4%
Explanation:
i had the same question
Please help me with this :) thank you
Answer:
your welcome :)
Explanation:
David drops a golf ball and a bowling ball at the same time. He then drops a tennis ball and a volleyball. He notices that each pair hit the ground at the same time. Then David picks up a marble and a baseball. If he drops them both at the same time, what can David predict will happen
Answer:
if he drops them some where there is no air they will both land at the same time as they have no air resistance and gravity pulls every item equally but if they just do it of a building in the middle of the street then the baseball would hit first as it has a larger mass
Explanation:
The pressure of gas in a 600.0 mL cylinder is 65.0 mmHg. What is the new volume when the pressure is increased to 385 mmHg?
Answer:
P1V1=P2V2
65 mmHg × 600 mL = 385 mmHg × V2
V2 = 101.30 mL
Explanation:
We can use Boyle's law
Cho một lượng hỗn hợp CuO và Fe2O3 tác dụng hết với dung dịch HCl thu được 2 muối có tỉ lệ mol là 1 : 1. Phần trăm khối lượng của CuO và Fe2O3 trong hỗn hợp lần lượt là:
Answer:
fafsafwafsxDlmfao
Explanation:
please help , science tho. by the way i have to do 5
Answer:
850
Explanation:
It's between 840 and 860
BTW this is actually a science quetion.
What is the amount of matter in an object compared to the space it takes up. Im confused because i think its mass but i was told that mass is the amount of matter something contains.
Answer:
Volume simply refers to the space an object takes up. Depending on the physical state of an object, there are a couple ways to measure volume.
can you solve these?
Answer:
yes
Explanation:
it's easy
How many subshells in 4s
Answer:
hhjkjggghjjjjjj
Explanation:
vbjjkkkkkkkj