Answer:
Lead atoms have 82 electrons and the shell structure is 2.8. 18.32. 18.4.
Explanation:
The ground state electron configuration of ground state gaseous neutral lead is [Xe].
Fertilizer from an agricultural area runs off into a river. The river carries the nutrients from this fertilizer and deposits them into an ocean bay. After the nutrients enter the bay, scientists monitoring the water would most likely see a decrease in which of these dissolved gases?
Answer:
i think it is oxygen
Explanation:
The concentration of an H2C2O4 solution is determined by titrating it with a 0.1968 M solution of permanganate. The balanced net ionic equation for the reaction is shown below. 2 MnO4-(aq) + 5 H2C2O4(aq)+6 H3O+(aq)2 Mn2+(aq) + 10 CO2(g)+14 H2O(l) In one experiment, 24.98 mL of the 0.1968 M MnO4- the solution is required to react completely with 20.00 mL of the H2C2O4 solution. Calculate the concentration of the H2C2O4 solution.
Answer:
0.6145M
Explanation:
Based on the chemical equation, 2 moles of MnO₄⁻ reacts with 5 moles of H₂C₂O₄.
To solve this problem, we need to find moles of MnO₄⁻, with the chemical equation the moles of H₂C₂O₄ and, the concentration of this solution.
Moles MnO₄⁻:
24.98mL = 0.02498L * (0.1968mol / L) = 4.916x10⁻³ moles MnO₄⁻
Moles H₂C₂O₄:
4.916x10⁻³ moles MnO₄⁻* (5 moles H₂C₂O₄ / 2 moles MnO₄⁻) =
0.01229 moles H₂C₂O₄
Molarity H₂C₂O₄:
0.01229 moles H₂C₂O₄ / 0.0200L =
0.6145MWhat is the mass of an atom with seven protons, seven neutrons, and seven electrons? Record and bubble in your answer below.
Answer:
Mass would be 14 amu
Explanation:
If particles have enough kinetic energy to partly overcome
the force of attraction between them, matter exists as a
Answer:
Liquid
Explanation:
Zygote fungi spores can survive very harsh conditions
why is a bird not considerd a autotroph?
Answer:
An Autotroph is an animal which can make its own food eg: plants make their own food. But birds hunt and search for their food they do not make it by themselves. Hence birds are not considered Autotrophs, instead they are considered to be Heterotrophs (animals which do not make their own food)
Explanation:
What is the relationship between ionization energy and the
element's location on the periodic table?
Plant and animal cells have basically the same shape when viewed
under a microscope.
True or false
Answer:
False
Explanation:
Plant cells have rectangular shapes while animal cells are shaped irregularly.
Food contains chemical potential energy that the body uses. How do you think that the body gains this energy
5. Convert the following numbers into scientific notation
0.04500 hm
What is the density of an object with a mass of 57.8g and a volume of 112.4mL?
D=m/v
D=57.8/112.4
D=0.51423487544 g/mL^2
As a pendulum swing from its highest to its lowest position along an arc, what happens to its kinetic energy and potential energy
A. Both the potential energy and kinetic energy decrease
B. The potential energy decreases while the kinetic energy increases
C. The kinetic energy decreases while the potential energy increases
D. Both the potential energy and kinetic energy increase
Answer:
B.The potential energy decreases while the kinetic energy increases.
7. Two samples of gold must have the same
Two samples of gold must have the same density as they have the same kind of atoms.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
Learn more about atom,here:
https://brainly.com/question/13654549
#SPJ2
A substance has a density of 4.5 g/cm3. The substance is heated and its density recalculated. What is the newly recorded density?
Answer:
Aluminum
Explanation:
how do you find time when you have been given the distance
Answer:To solve for time, divide the distance traveled by the rate. For example, if Cole drives his car 45 km per hour and travels a total of 225 km, then he traveled for 225/45 = 5 hours.
Explanation:
At 235°C, the pressure of a sample of oxygen gas is 743 mm Hg. If the volume remains the same, what will the pressure be at 265°C?
Answer:
786.88 mmHg
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T1) = 235 °C
Initial pressure (P1) = 743 mmHg
Volume = constant
Final temperature (T2) = 265 °C
Final pressure (P2) =..?
Next, we shall convert Celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T1) = 235 °C
Initial temperature (T1) = 235 °C + 273 = 508 K
Final temperature (T2) = 265 °C
Final temperature (T2) = 265 °C + 273 = 538 K
Finally, we shall determine the new pressure as illustrated below:
Initial temperature (T1) = 508 K
Initial pressure (P1) = 743 mmHg
Final temperature (T2) = 538 K
Final pressure (P2) =..?
P1/T1 = P2/T2
743/508 = P2/538
Cross multiply
508 × P2 = 743 × 538
508 × P2 = 399734
Divide both side by 508
P2 = 399734 / 508
P2 = 786.88 mmHg
Therefore, the new pressure of the gas is 786.88 mmHg
how to know whether something is an "atom" or not? for example
Ex: is hydrogen peroxide an "atom" ?
Ex 2: is butane an atom?
A new sunscreen has been developed that is supposed to be more effective at preventing sunburn. 30 participants spray one arm with the new formula, and spray the other arm with the leading formula. After 4 hours in the sun, their skin is evaluated for any redness. What is the purpose of the experiment? Identify the independent variable. Identify the dependent variable. Describe the first group of people in the experiment. Describe the second group of people in the experiment. Identify two factors which are kept constant( same). Which group is the test group? Which group is used for comparison?
Answer:
Explanation:
This question appears incomplete but can however still b answered.
The purpose of the experiment is to test the effectiveness of the new sunscreen.
An independent variable is the variable that is changed (directly or indirectly) during the course of an experiment. The independent variable here are the sunscreen.
A dependent variable is the variable that is been tested in the course of the experiment. The dependent variable here is the redness of the skin.
The first group here (this could be in the missing part of the question, hence response not certain) is the control group. The control group consists of the arms sprayed with the leading/old sunscreen formula.
The second group is the test group. It consists of the arms sprayed with the new sunscreen formula.
The factors that are kept constant (or control variable) are the duration under the sun (4 hrs) and the participants' arms used.
The test group is the second group while the group used for comparison (to be sure the new sunscreen is more effective) is the first group.
HELPPPPP ME ASAP!
It's urgent
Answer:
0.2 M
Explanation:
Please see the attached pictures for the full solution.
Iron is the most
abundant metal
found on Earth
A. First
B. Second
C. Third
D. Fourth
hope this is correct
Answer:
D
Explanation:
Iron is the fourth most abundant element, by mass, in the Earth's crust. The core of the Earth is thought to be largely composed of iron with nickel and sulfur. The most common iron-containing ore is haematite, but iron is found widely distributed in other minerals such as magnetite and taconite.
What is true of electrolytic cells but is not true of galvanic cells?
O A. They are spontaneous.
O B. They are nonspontaneous.
O C. Oxidation happens at the cathode.
O D. Reduction happens at the anode.
Answer:
The galvanic cells carry out the spontaneous reactions; there fore they dont require energy. They release free energy that also can be used to do work.
Answer:
B. They are nonspontaneous
Explanation:
Just took test
is two objects have the same density they must have the same blank
Answer:
i think the answer is mass is that one of the answers?
Explanation:
Sound waves move the slowest through which medium :
water
ice
air
wood
Answer
Sounds travel slowest in gasses so it would be air
Answer: c - air
Explanation: took the test
When you walk at an average speed of 5km/h for 30 minutes, how far will you walk?
Answer:
150
Explanation:
i think that was the answer
ASAP MULTIPLE CHOICE
What did Robert Millikan discover?
the nucleus of the atom
the mass of an electron
the charge-to-mass ratio of the electron
the charge of a neutron
Answer:
Robert Millikan discovered the elementary charge of an electron.
C
what word best describes volume
Answer:
volume is the amount of space something occupies
Explanation:
Answer:The space an object takes up
Explanation:
How many significant figures are in 0.57
Answer:
0.57
Sig Figs
2
Decimals
2
Scientific Notation
5.7 × 10-1
Words
zero point five seven
Explanation:
Answer:
2
Explanation:
Calculate the given value using significant figures:
23.033 cm + 34.045 cm +55.040 mm
Answer:
The Answer is 112.118
Explanation:
Answer:
62.582 cm
Explanation:
divide 55.040mm by 10 because there is 10mm in 1 cm.
you will get 5.504 then just add 23.033 and 34.045
- the least amount of sig figs after the decimal is 3 so it stays as 62.582 cm.
How do you test color?
Answer:
red
Explanation:
rojo yyyyy888888iiiiii
Imagine you had salt and pepper mixed together in a cup. What could you try to do
to separate the salt from the pepper?
Without tasting it, is it possible to distinguish salt water from pure water? Explain.
Write here:
To separate the salt from the pepper, I could try....
It
possible to distinguish salt water from pure water because ...
I
add speaker notes
The first difference that many people noticed was that salt will dissolve in water, but pepper will not. Some say putting it in the water will help. The pepper floats on the surface, while the salt sinks to the bottom and then dissolves. You can then evaporate the water to recover the salt.
