Answer:
A.
Explanation:
Thread-like structures that are found in the nucleus of a cell that contains all DNA.
A.) DNA
B.) Genes
C.) Chromosomes
D.) Nucleus
1. List 3 physical and chemical phenomena
Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Hope this helped.
How many atoms are there in 1.005 moles of CO2?
Answer:
[tex]6.05211\times 10^{23}\ \text{atoms}[/tex]
Explanation:
Moles of carbon dioxide = 1.005 moles
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Number of atoms is given by
[tex]\text{Moles}\times N_A=1.005\times 6.022\times 10^{23}[/tex]
[tex]=6.05211\times 10^{23}\ \text{atoms}[/tex]
The number of atoms in the given amount of moles of carbon dioxide is [tex]6.05211\times 10^{23}\ \text{atoms}[/tex].
Chlorine exists as a gas, and iodine exists as a solid at room temperature. What explains the difference in the physical states of the substances at room temperature?
The intermolecular attractions are weaker with chlorine than iodine.
The intermolecular attractions are stronger with chlorine than iodine.
Chlorine has more electrons than iodine..
Chlorine has less protons than iodine.
Answer:
The correct answer is B)The intermolecular attractions are stronger with chlorine than iodine.
Explanation:
Have a nice Day
Answer:
cfvghjnmkljhgtfaASDFGVBHNJNGFDXZVBRNHT45RFD
Explanation:
Loggerhead turtles live and migrate around the Atlantic Ocean. Which of the following is an adaptation of Loggerhead turtles? *
What is used to contain an acid spill and what are the characteristics of them?
Which of the following is a homogeneous mixture?
A. beef stew
B. melting
C. rusting
D. cutting
Answer:
B. Melting
Explanation: Process of elimination
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A H2CO3 (aq) ---> CO2 (g) + H2O (l) B H2SO4 (aq) + 2NaOH (aq) ---> Na2SO4 (aq) + 2H2O (l) C 2H2 (g) + O2 (g)----> 2H2O (l) D AgNO3 (aq) + NaOH (aq) ---> AgOH (s) + NaNO3 (aq) Which equation above represents a precipitation reaction?
Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The equation which represents a precipiation reaction is:
[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
Light-colored moths blend with light-colored tree bark in their environment. A moth with a dark- colored variation blends with dark-colored tree bark but stands out against light-colored bark. What environmental change would give the dark-colored moth in the picture an adaptive advanage and enhance its survival?
A. The dark-colored moth will have an advantage if it begins to feed at night.
B. If the climate warms, dark-colored moths will absorb more heat.
C. Light-colored moths will be killed more readily if the climate cools.
D. If a change in the environment causes most of the trees to darken, the dark-colored moth will have an advantage.
a nonliving substance found in earth crust
Answer:
Dirt
mud
rocks
ect.
Explanation:
The following symbol (<-->) means
Answer:
Greater than or less than
calculate the mass of 0.5mols of CH3COOH
Answer:
30 g
Explanation:
In order to convert from moles of CH₃COOH to grams, we need to use its molar mass:
Molar mass of CH₃COOH= (Molar Mass of C)*2 + (Molar Mass of H)*4 + (Molar Mass of O)*2 = 60 g/molNow we convert moles into grams:
0.5 mol * 60 g/mol = 30 gSo 0.5 moles of CH₃COOH have a mass of 30 grams.
Order the items below from largest to smallest size.
ITEM BANK
1 atom of oxygen
1 mole of oxygen
1 molecule of oxygen
3.01 X 1023 atoms of oxygen
4 grams of oxygen
1_
2_
3_
4_
5_
Answer:
1- gram of oxygen, 2- 3.01x1023 atoms of oxygen, 3- 1 molecule of oxygen, 4- 1mole of oxygen, 5- 1atom of oxygen.
Put each equation under the correct heading.
The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. What is the empirical formula of acetic acid?
Answer:
CH₂O
Explanation:
From the question given above, the following data were obtained:
Carbon (C) = 39.9%
Hydrogen (H) = 6.7%
Oxygen (O) = 53.4%
Empirical formula =?
The empirical formula of acetic acid can be obtained as follow:
C = 39.9%
H = 6.7%
O = 53.4%
Divide by their molar mass
C = 39.9 / 12 = 3.3
H = 6.7 / 1 = 6.7
O = 53.4 / 16 = 3.3
Divide by the smallest
C = 3.3 / 3.3 = 1
H = 6.7 / 3.3 = 2
O = 3.3 / 3.3 = 1
The empirical formula => CH₂O
I need help with this please
Answer:
raising the Concentration of liquid
raise the temperature of the system
bubbles of hydrogen gas
Need help with this chemistry problem
Why are fossils not found in igneous or metamorphic rocks?
Answer:
Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.
Explanation:
Hope this helps! :)
Answer:
Because...
Explanation:
Igneous rock is cooked in extreme hot temperatures.
Metamorphoc is lava cooled downed.
4. How many liters of solution would be needed in a 4.5M solution that contains
101.1g of KNO3?
explain why the constellations in the night sky change with the seasons
Answer:
Explanation:
If observed through the year, the constellations shift gradually to the west. This is caused by Earth's orbit around our Sun. In the summer, viewers are looking in a different direction in space at night than they are during the winter.
How much heat must absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s)?
Answer:
about 4.8kJ
Explanation:
There is some missing information in the question given.
For use to determine the amount of heat that must be reacted in the system to convert 100g of NaNO₃ into NaHSO₄(s);
Then, we need to consider the following reaction between sodium nitrate (NaNO₃) and sulfuric acid (H₂SO₄):
[tex]\mathbf{NaNO_{3(s)}+ H_2SO_{4(l)}\to NaHSO_{4(s)}+HNO_{3(g)} \ \ \ \ \ \Delta H = 21.2 \ kJ}[/tex]
From the above reaction, 84.99 gm of NaNO₃ reacted with H₂SO₄ which is converted into NaHSO₄ thereby absorbing 21.2 kJ amount of heat.
This implies that; if 84.99 gm of NaNO₃ absorbs 21.2 kJ amount of heat.
1 gm of NaNO₃ will absorb = [tex]\mathsf{\dfrac{21.2}{84.99} \ kJ \ heat}[/tex]
= 0.2494 kJ amount of heat.
∴
100 g of NaNO₃ will absorb [tex]= \mathsf{\dfrac{21.2}{84.99} \times 100 \ kJ \ heat}[/tex]
= 24.94 kJ amount of heat.
Therefore, we can conclude that the amount of heat that must be absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s) is 24.94 kJ.
Learn more about the amount of heat absorbed in a chemical reaction here:
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How many liters would 18.0 grams of water vapor occupy at 273 K and 1.00 atm?
Answer:
22.41 Liters
Explanation:
Using the general law equation;
PV= nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question,
mass of water vapor = 18g
Molar mass of water (H2O) = 1(2) + 16 = 18g.
mole = mass/molar mass
- mole (n) = 18/18 = 1mol
V = ?
T = 273K
p = 1 atm
Using PV = nRT
V = nRT/P
V = 1 × 0.0821 × 273/1
V = 22.41 Liters
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
Answer:
1 and 4
Explanation:
What causes one water molecule to stick to another water molecule?
Answer:
Hydrogen Bonds Make Water Sticky
Explanation:
This sticking together of like substances is called cohesion. Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.
4 L of He gas is mixed with 2 L of Ne gas. What is the mole fraction of each component?
moles of He=4 L/22.4 L=0.1786 mol
moles of Ne=2 L/22.4 L=0.0893 mol
total moles of the gas mixture
=0.1786+0.0893
=0.2679 mol
mole fraction of He=0.1786 mol/0.2679 mol=0.6667
mole fraction of Ne=0.0893 mol/0.2679 mol=0.3333
How many hours are in 188 years
Answer: about 1,705,536 hrs
24 hrs = 1 day
189 hrs = 1 week
756 = 1 month
9072 = 1 yr
1,705,536 = 188 yrs
Explanation:
Trust Milky. Milky smart
I really can’t do this don’t understand it
Answer:
7.96g, 33.79%
Explanation:
I'll try my best to explain the entire process behind this question ;)
From the question, you can write the reaction
[tex]2H_2O(l)->2H_2(g)+O_2(g)[/tex]
Now, there are a few reasons it is like this. Oxygen is a diatomic element, meaning it doesn't and can't exist as just O. It exists as O₂. To balance, this, double the amount of water and hydrogen so there is an equal amount of each element on both sides of the reaction (4 H's, 2 O's on the reactant side, and 4 H's, 2 O's on the product side).
From this we can get a mole-to-mole ratio.
Onto the stoichiometry. Our goal in this is to convert from grams of water to grams of hydrogen, and we do so with a mole to mole ratio.
[tex]71.0gH_2O*\frac{1molH_2O}{18.02g} *\frac{2molH_2}{2molH_2O}* \frac{2.02g}{1molH_2}\\\\ =7.96gH_2[/tex]
Basically, what I did was divide by water's molar mass to get moles of water, multiplied by the mole-to-mole ratio (2:2) to get moles of H2, and then multiplied by H2's molar mass to get what should be the amount of H2 produced by the reaction.
For percent yield, you can calculate it is such:
[tex]\frac{Actual}{Theoretical}*100[/tex]
Plug the numbers in:
[tex]\frac{2.69g}{7.96g}*100\\\\ =33.79%[/tex]
So, the percent yield is 33.79%
why do atoms combine to form compund?
Answer:
See below
Explanation:
The following reasons tell why atom combine to form compounds:
1) They want to follow octet or duplet rule and attain the noble gas configuration.
2) They combine to form compounds because of the electrostatic attraction between them.
3) They form compounds to lower their energy and to become stable.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH18076. Which of the following is not a characteristic of electromagnetic light waves?
O A. They can be reflected and refracted.
O B. They travel at the same speed through any one material.
O C. They can't travel through a vacuum.
O D. They obey the formula velocity = wavelength x frequency
Answer:
B. They travel at the same speed through any one material.
Explanation:
Which of the following is NOT an example of circular motion?
(A) car turning a corner
(B) car accelerating onto highway
(C) yo-yo on a string going in a circle
(D) the Moon’s path around Earth
Answer:
B
Explanation:
A body moving with a constant speed and constantly changing direction and changing velocity is said to be in circular motion.
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22 How does Earth's tilt affect climate?
OA. smaller the tilt, the warmer the summer.
OB. The smaller the tilt, the smaller the temperature difference is between summer and winter.
OC. The larger the tilt, the warmer the summer.
OD. The larger the tilt, the smaller the temperature difference is between summer and winter.