Answer:
True
Explanation:
A physical property is a property that can be measured without changing the chemical composition of the substance.
The chemical composition of iron does not change when it conducts electricity so conductivity is a physical property.
Hope that helps.
Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the given statement is true.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
A physical property is a property that can be measured without changing the chemical composition of the substance. So, ability of iron to conduct electricity is a physical property of iron
Therefore, the given statement is true.
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Oxygen Molecules taken in per breath: The Athletes result will be?
Answer:
Explanation:
the answer is higher because there is more exercise that makes it higher
hope this helps
Please help me iv'e been stuck on it for 5 hours and it's science please help me and this better be worth it because i haven't been on brainly and i don't have much points rn so can someone please help me thank you
Answer:
1.)Elements
2.)Compound
3.)Subscript
4.)Formulas
Explanation:
Answer:
this is my other account btw and i just wanna thank you so much i don't want to fell this semester and now ima mark you brainliest thank you so so so much
Explanation:
can someone answer this question?
Answer:
what is the question i could help if u gave me the question but i don't see it
Explanation:
As of January 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 yesrs of operating 104 nuclear power plants.
on average how much waste is produced by each plant on a monthly basis?
a. 0.8 tons p. month
b. 83.3 tons p. month
c. 104 tons p. month
d. 866.3 tons p. month
Answer: a. 0.8 tons p. month.
Explanation:
Given: Total nuclear waste = 60,000 metric tons
Time take = 60 years = 12 x 60 months [ 1 year = 12 months]
= 720 months
Total nuclear power plants = 104
Now , Average waste produced by each plant = [tex]\dfrac{\text{Total waste}}{\text{Time x Number of plants}}[/tex]
[tex]=\dfrac{60000}{720\times104}\approx0.8\text{ tons per month.}[/tex]
Hence, 0.8 tons p. month is produced by each plant.
So, option a. is correct.
Answer:
A on edge 2021
Explanation:
According to the carbon cycle, what two processes increase CO2 in the atmosphere?
Answer: Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt. Carbon dioxide is also added to the atmosphere through human activities, such as the burning of fossil fuels and forests and the production of cement.
Explanation: Hope this helps :)
Balance Nuclear Reaction
94239Pu --> 24He + ________
hi can you pls help :)
Answer:i think it is c, it explodes in water because that’s a chemical reaction
Explanation:
covalent bonds always share electrons equally
A: True
B: False
I hope this helped! +*♡
What three consumers live in the epipelagic zone?
A balloon is filled with helium gas has a volume of 1.0 L at a pressure of 1.0 atm. The
balloon is released and reaches an altitude where the pressure is now 0.4 atm. What is the
new volume of the balloon at this altitude assuming the air temperature has not changed?
Answer:
2.5 LExplanation:
The new volume of the balloon can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{1 \times 1}{0.4} = \frac{1}{0.4} \\ = 2.5[/tex]
We have the final answer as
2.5 LHope this helps you
Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?
Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself.
Krypton is a halogen, so it should be kept secret because it is so reactive and toxic.
Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Krypton is a noble gas, so it secretly bonds with every type of element without showing it
Answer:
C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Explanation:
Answer:
C
Explanation:
6 NH4Cl
How many hydrogen atoms are shown?
Answer:
24
Explanation:
6*4=24
How many unpaired electrons are present in V3+?
Answer: two unpaired
Explanation: In general, electrons are removed from the valence-shell s-orbitals before they are removed from valence d-orbitals when transition metals are ionized. And thus, V3+ is paramagnetic, because it has two unpaired 3d-electrons.
Describe what a geologist would observe if she poured acid on the sculpture
Answer:
A geologist would observe how the material that the sculpture is made out of reacts to the acid.
the melting point of gallium metal is 29.76°C If a piece of gallium is sliced into three parts, the melting point will be:
A. higher than 29.76°C
B. 29.76°C
C. lower than 29.76°C
Answer: B. 29.76°C
Explanation:
The melting point is known as an intensive property of matter. This means the melting point is not affected by the amount of mass. Whether the metal is really large or small, the melting point of gallium (Ga) is roughly 29.76 degrees Celsius.
what chemical reaction type is Pb + 2 H3PO4 --> 3 H2 + Pb3(PO4)2
Answer:
single displacement reaction
Explanation:
it is because an atom(Pb) dispalces another atom(H) in H3PI4
The given chemical reaction is single displacement reaction.
What is single displacement reaction?When one element in a molecule gets replaced by another, is therefore called a single displacement reaction.
The given reaction is Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2
It can be seen that when lead is treated with H3PO4 then it will give Pb3(PO4)2 and hydrogen reaction. It is a kind of single displacement reaction.
Therefore, the given reaction is single displacement reaction.
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Calculate the percentage by mass in each element
N in NH3
Answer:
82.35%.
Explanation:
Mass of 1 molecule of ammonia
NH₃ = 14+3(1)
= 17
Calculating percentage by mass of N.
[tex]\%=\dfrac{\text{Mass of Nitrogen atom}}{\text{Mass of ammonia molecule}}\times 100[/tex]
[tex]\%=\dfrac{14}{17}\times 100\\\\=82.35\%[/tex]
So, the required percentage is 82.35%.
Which of the following elements is the least electronegative?
A. NA
B. Al
C. Cl
D. Si
Answer:
na
Explanation:
gggggggggggggggggggggggggg
Cl (chlorine) ion is negatively charged.
plzz help guyss I'm so confused
Starting from rest, you reach a speed of 20 m/s in 4 seconds. What is your acceleration?
what’s the answer to this question pls help
What makes a pure substance different from a heterogeneous mixture? (4 points)
Explanation:
Pure substances are elements and compounds. These substances have the following properties:
All parts are the same throughout which implies that they are homogeneous. They have a definite composition. They cannot be easily separated or broken down into simpler substances by physical meansSeparation by physical means is not possible They have unique sets of physical properties.Heterogeneous mixtures have completely opposite properties as the pure substances as given above.
Tungsten fits best into which category?
A. molecule
B. element
C. compound
D. mixture
Tungsten is an element. It is located in the d -block of periodic table. Thus it is a transition metal. Hence, option B is correct.
What is tungsten ?Tungsten is 74th element in periodic table. It is a transition metal thus, located in the d-block of periodic table. Tungsten has the chemical symbol W. Tungsten was first identified as an element in 1781.
The maximum melting temperature of any known element other than carbon, 3,422 °C, is reached by the unbound element, making its resistance all the more remarkable (which sublimes at atmospheric pressure). Tungsten has a boiling point of around 5930°C.
A few of the many alloys that contain tungsten and have many applications include radiation shielding, X-ray tubes, electrodes in gas tungsten arc welding, superalloys, and incandescent light bulb filaments.
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If 0.621miles = 1 km, how many miles will a person run during a 15 km race?
PLSS HELP! The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide? (4 points)
a. Carbon and oxygen are chemically bonded in it.
b. Carbon and oxygen retain their original identity in it.
c. It can be separated into carbon and oxygen using physical methods.
d. The proportion of carbon and oxygen is different in different samples of the gas.
Answer:
The answer is option A..
Can anyone help me with this?
Answer:
(a)
[tex]v = 10.1mL[/tex] --- Silicon
[tex]v = 9.0mL[/tex] --- Tin
[tex]v = 7.5mL[/tex] -- Lead
(b)
[tex]d = 1.55g/mL[/tex] --- Silicon
[tex]d = 5.56g/mL[/tex] --- Tin
[tex]d = 9.53g/mL[/tex] --- Lead
Explanation:
Given
The attached table
Solving (a): The volume of each sample
For each element, the volume (v) is calculated as:
[tex]v = v_f - v_i[/tex]
Where:
[tex]v_f = Final\ Volume[/tex]
[tex]v_i = Initial\ Volume[/tex]
So, we have:
Silicon:
[tex]v_f = 40.1mL;\ \ \ v_i = 30.0mL[/tex]
So, we have:
[tex]v = 40.1mL - 30.0mL[/tex]
[tex]v = 10.1mL[/tex]
Tin:
[tex]v_f = 29.0mL;\ \ \ v_i = 20.0mL[/tex]
So, we have:
[tex]v = 29.0mL - 20.0mL[/tex]
[tex]v = 9.0mL[/tex]
Lead:
[tex]v_f = 33.5mL;\ \ \ v_i = 26.0mL[/tex]
So, we have:
[tex]v = 33.5mL - 26.0mL[/tex]
[tex]v = 7.5mL[/tex]
Solving (b): The density of each sample
For each element, the density (d) is calculated as:
[tex]d = \frac{m}{v}[/tex]
Where
[tex]m = mass[/tex]
[tex]v = volume[/tex]
So, we have:
Silicon:
[tex]m = 15.70g[/tex]
[tex]v = 10.1mL[/tex] --- calculated in (a)
Density (d):
[tex]d = \frac{15.70g}{10.1mL}[/tex]
[tex]d = 1.55g/mL[/tex]
Tin:
[tex]m = 50.07g[/tex]
[tex]v = 9.0mL[/tex] --- calculated in (a)
Density (d):
[tex]d = \frac{50.07g}{9.0mL}[/tex]
[tex]d = 5.56g/mL[/tex]
Lead:
[tex]m = 71.47g[/tex]
[tex]v = 7.5mL[/tex] --- calculated in (a)
Density (d):
[tex]d = \frac{71.47g}{7.5mL}[/tex]
[tex]d = 9.53g/mL[/tex]
Use the drop-down menus to complete the statements.
A segment of DNA is called a
.
A complex of nucleic acids and proteins that make up chromosomes is called
.
A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a
.
A segment of DNA is called a gene.
A complex of nucleic acids and proteins that make up chromosomes is called Chromatin
A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a chromosome.
Answer:
1. Gene
2. Chromatin
3. chromosome
Explanation:
I hope this helps you :)
A small amount of solid potassium dichromate is added to water and stirred until all of the solid has dissolved and a clear orange liquid is produced. This process may be described as: Group of answer choices the formation of a heterogeneous mixture. dissolution of the molecular compound sublimation. dissolution and dissociation of the ionic compound.
Answer: dissolution and dissociation of the ionic compound.
Explanation:
Ionic compound is formed by the transfer of electrons.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here potassium metal forms [tex]K^+[/tex] cation and [tex]Cr_2O_7^{2-}[/tex] anion which exchange their oxidation states to form [tex]K_2Cr_2O_7[/tex].
When ionic compound is dissolved in water, it dissociates to its respective ions.The ions form bonds with oppositely charged ions of water molecules and thus get dissolved in water called as dissolution.
When 29 grams of sodium metal (Na) react with 49 grams of chlorine gas (C1), solid
sodium chloride (NaCl) is created in synthesis reaction. How much excess sodium OR
chlorine is left over?
Answer:
Explanation:
Na + Cl = NaCl
23 g 35.5 g
23 g sodium reacts with 35.5 g of chlorine
29 g of sodium reacts with 35.5 x 29 / 23 g of chlorine
= 44.76 g
So 44.76 g of chlorine reacts and 49 - 44.76 = 4.24 g of chlorine is left over .
All the sodium is used up in the reaction .
Iodine monochloride (ICl) has a higher boiling point than bromine (Br2) partly because iodine monochloride is a(n)
Answer: polar molecule.
Explanation:
The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. The boiling point is dependent on the type of forces present.
Iodine monochloride (ICl) is a polar molecule due to the difference in electronegativities of iodine and chlorine. Thus the molecules are bonded by strong dipole dipole forces. Thus a higher temperature is needed to generate enough vapor pressure.
Bromine [tex](Br_2)[/tex] is a non polar molecule as there is no electronegativity difference between two bromine atoms. The molecules are bonded by weak vanderwaal forces and thus has low boiling point.
Can someone help me with this?
Answer:
Its Vog
Explanation: