Answer:
Protons: 84
Neutrons: 127
Explanation:
The number of protons is the atomic number. The number of neutrons can be found by subtracting the proton number (84) from the isotope number (211)
Polonium-211 is an isotope of polonium which has 84 protons and 127 neutrons.
What are isotopes?
Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable
Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .
Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.
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URGENT !! Help fast this is due at 8:30 am.
Distinguish between the different types of Mixtures. And explain your answer
Answer:
a. solid- liquid mixture: Mixture that involves a solid and liquid substance.
b. solid- solid mixture: Mixture that involves two solid substances.
c. solid-gas mixture: Mixture that involves both a solid and gas substance.
d. liquid-liquid mixture: Mixture that involves two liquids.
e. liquid - gas mixture; Mixture of a liquid and a gas.
f. gas-gas mixture: Mixture of gases.
Explanation: Hope this helps.
how to know whether something is an "atom" or not? for example
Ex: is hydrogen peroxide an "atom" ?
Ex 2: is butane an atom?
Jose’s lab partner gives him a solution of sodium phosphate that is buffered to a ph 4. Because of an error that he made while calibrating the ph meter, Jose’s measurements of the ph of the sodium phosphate solution are 5.4,5.4, and 5.4
Which statement best describes his results
A they are accurate but not precise
B they are precise but not accurate
C they are both precise and accurate
D they are neither precise or accurate
Answer:
B. They are precise but not accurate.
Explanation:
I got it right on edge 2020
Answer:
b
Explanation:
How do you test color?
Answer:
red
Explanation:
rojo yyyyy888888iiiiii
What atom has 35 protons and 47 neutrons ?
Answer:
Bromine
Explanation:
Answer:
Bromine??
I think bromine is the answer but i may be wrong
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:
When Oxygen in the air reacts with Iron, Iron Oxide forms.
Which of the following statements is correct?
A. Group of answer choices
B. This is a chemical change.
C.This is a physical change.
D. Oxygen and iron have similar properties.
E. Iron and iron oxide have the same properties.
Answer:
I think its E. iron and iron oxide have the same properties if it's not e its d for sure
Explanation:
iron + oxygen → iron oxide. 4 Fe + 3 O2 → 2 Fe2O.
Describe how the energy of a shear wave relates to the direction of particle motion.
Answer: Energy of a shear wave relates to the direction of a particle motion is downwards.
Explanation:
Answer:
Describe how the energy of a shear wave relates to the direction of particle motion.
Explanation:
identify the following substance
Answer:
its a mixture not sure but hope I helped
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.
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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
5. Convert the following numbers into scientific notation
0.04500 hm
How will the beam of light interact with the piece of wood?
Answer:
When a light wave with a single frequency strikes an object, a number of things could happen. The light wave could be absorbed by the object, in which case its energy is converted to heat. The light wave could be reflected by the object. And the light wave
Explanation:
In the wave-mechanical model of the atom, an orbital is defined as
1.
a region of the most probable proton location
2.
a region of the most probable electron location
3.
a circular path traveled by a proton around the nucleus
4.
a circular path traveled by an electron around the nucleu
Answer:
I think its 2
Is a Cork Cell unicellular or multicultural?
The cork cells are the dead cells and they are present periphery of roots and stems of matured plants. Here a Cork Cell is multicultural.
What are the terms unicellular and multicellular?The organisms which is made up of a single cell is defined as the unicellular organisms whereas the organisms with numerous cells are called multicellular organisms. The bacteria is a unicellular organism and humans are multicellular.
In unicellular organisms a single cell carry the whole functions whereas in multicellular organisms multiple cells perform many functions. The body organization of unicellular organism are simple whereas the multicellular organisms have complex body organization.
Here cork cells are multicellular. A protective coat of a tree seen in outer region is called cork. It prevents water loss through bark. A cork is composed of multiple thick layers.
Thus cork cell is a multicellular cell.
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how hot it lava!!!
bill nye: volcano
Answer: bill nye is a og.
Which characteristic of a substance is considered a chemical property?
Answer:
reactivity (readiness to produce new substances)
Answer:
i don't know you have to give me the other possible answer choices so i can answer and help you out.
Explanation:
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:
Express the following in liters at STP:
6.62 x 10-3 moles HF
Answer:
The volume of 6.62×10⁻³moles of HF at STP is 148.38×10⁻³ L
Explanation:
Given data:
Number of moles of HF = 6.62×10⁻³ mol
Volume of HF in litter at STP = ?
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
Standard temperature = 273 K
Standard pressure = 1 atm
Now we will put the values in formula.
1 atm × V = 6.62×10⁻³mol ×0.0821 atm.L/ mol.K × 273 K
V = 6.62×10⁻³mol ×0.0821 atm.L/ mol.K × 273 K / 1 atm
V = 148.38×10⁻³ L
Thus, the volume of 6.62×10⁻³moles of HF at STP is 148.38×10⁻³ L.
0.089 in scientific notation
Answer: 8.9 * 10^2
and that is all
A pencil has density of 0.875 g/cm^3. It has a volume of 4.0 cm^3. What is the mass?
Answer:
3.5g
Explanation:
[tex]Density=\frac{mass}{volume}\\ Mass= Density X Volume\\Mass = 0.875 X 4.0\\Therefore, Mass = 3.5 g[/tex]
Answer:
3.703703703703
Explanation:
Which of the following has mechanical energy? (5 points)
Car battery
Compressed spring
Glowing incandescent lightbulb
Nucleus of uranium atom
Answer:
It is B
Explanation:
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
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.
Which two characteristics do all flowering plants have in common?
O A. They produce seeds.
O B. They produce cones.
C. They have vessels.
O D. They lack roots.
Answer: They have vessels, and produce seeds.
Explanation: Flowering plants have vascular tissue and use seeds to reproduce.
Answer: It is A and C
A P E X
Explanation:
I hope this help
If particles have enough kinetic energy to partly overcome
the force of attraction between them, matter exists as a
Answer:
Liquid
Explanation:
What 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:
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
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.
acrostic poem for matter
Answer:
M-Molecules are always moving
A-Anything that has mass and volume
T-Temperature determines how fast the molecules are moving
T-The states of matter are gas,liquid, and plasma
E-Evaporation makes a liquid turn to gas
R-Racing molecules make the space between the molucles increase
Explanation:
MATTER