What is two functions of the cytoskeleton?
Which has more mass a kilogram of bricks or a kilogram of feathers explain
Choose all the answers that apply.
Cell waste is removed from the body by _____.
- breathing
- sweating
- going to the bathroom
- eating
1. Is mass conserved when 50 g of sugar undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated.
2. During an investigation a scientist burned 48 g of magnesium strip. After the reaction the total mass of the product formed was found to be 80 g. Does the law of conservation of mass hold true in this case? Use complete sentences to justify your answer based on numerical calculations.
ACTUALLY answer the question please instead of posting stupid comments like on the last one
Answer:
Mass is still conserved even if it is melted or dissolved it is still conserved during and after the transformation.
Explanation:
I only have the answer to the first one. I did this on my school platform and still got it right.
which sample of co2 has a definite shape and a definite volume
A powdered drink mix is stirred into a glass of water to form a solution. If any more is added it will not dissolve
What type of reaction does the equation below represent? N2 + 3H2 —> 2NH3
a. synthesis
b. decomposition
c. single replacement
d. double replacement
If a 60 kg dog is on a 15 kg sled is pushed with a force of 300 N, what will be dogs acceleration? A) 900 N B) 4 kg C) 4 m/s2 D) 0.25 m/s2
Which are negative impacts that the internal combustion engine has had on society?
A.high power and health problems
B.noise pollution and health problems
C.efficient travel and noise pollution
D.efficient travel and high power
What is the correct name of this covalent compound BF3?
Question 11 options:
dinitrogen trioxide
dinitrogen oxalate
nitrogen oxide
nitrogen(III) oxide
Answer:
None of them. The correct name of the covalent compound is Boron Trifluoride.
Explanation:
BF3 - due to there being 1 Boron atom and three fluorine atoms, we will name:
B - Boron
F3 - because there is three fluorine, we will put the tri- prefix in front of Fluorine and change the ending to -ide.
With that, you get Boron Trifluoride.
science question down below
Suppose the liquid water and ice cream did not have solutes dissolved in it. What effect do you think this would have on ice cream ?
How many moles of MgSiO3 are in 199 g of the compound?
There are 1.98 moles of MgSiO₃ in 199 g of the compound, so one needs to use the molar mass of MgSiO₃, which is the sum of the atomic masses of its constituent elements.
What are moles of compound?The atomic mass of Mg is 24.31 g/mol, the atomic mass of Si is 28.09 g/mol, and the atomic mass of O is 16.00 g/mol. Therefore, the molar mass of MgSiO₃ is:
molar mass of MgSiO₃ = (1 x atomic mass of Mg) + (1 x atomic mass of Si) + (3 x atomic mass of O)
molar mass of MgSiO₃ = (1 x 24.31 g/mol) + (1 x 28.09 g/mol) + (3 x 16.00 g/mol)
molar mass of MgSiO3 = 100.39 g/mol
moles = mass/molar mass
To calculate the number of moles of MgSiO₃ in 199 g of the compound:
moles of MgSiO₃ = 199 g / 100.39 g/mol
moles of MgSiO₃ = 1.98 mol
Hence, there are 1.98 moles of MgSiO₃ in 199 g of the compound, so one needs to use the molar mass of MgSiO₃, which is the sum of the atomic masses of its constituent elements.
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Whicj of the following ions would represent the ion of an element from group 2A
Why do ionic compounds hve high melting points and boiling points
Answer:
Ionic compounds have high melting and boiling points due to their strong ionic bonding. This is due to the strong electrostatic interactions between positive and negative ions. That's why a large amount of energy is needed to break the bonding between ions.
Explanation:
The mass of the products after the reaction is 292 grams.Therefore, the mass of the reactants before the chemical reaction was_____
Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 9 neutrons
The element is identified exclusively by its number of protons. Atomic and mass numbers are included in isotopic notation. Oxygen isotope has an atomic number of 8 protons, 8 electrons, and 9 neutrons.
What is Isotopes?A chemical element's isotope is any of two or more species of atoms that share the same atomic number, position in the periodic table, and virtually identical chemical behavior.
But differ in atomic mass and physical characteristics. There are one or more isotopes for each chemical element.
Isotopes are forms of an element that have the same number of protons and electrons, but differing numbers of neutrons.
The many isotopes of an element have varying weights depending on how many neutrons there are in each one.
Therefore, Atomic and mass numbers are included in isotopic notation.
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water (h20) is composed of the same element as hydrogen peroxide (h202) how do their properties compare?
They have different properties because the arrangement of atoms is different.
They have the same properties because they have the same atoms.
they have different properties because they have different atoms.
they have the same properties because they have the same arrangement of atoms.
The formation of compound takes place by the combination of two or more different atoms. The combination of atoms takes place in a definite proportions. Compounds with different proportions of atoms have different properties.
Water ([tex]H_2O[/tex]) is composed of the same element as hydrogen peroxide ([tex]H_2O_2[/tex]) that is hydrogen ([tex]H[/tex]) and oxygen ([tex]O[/tex]). The combination of hydrogen and oxygen atoms in water is in [tex]1:2[/tex] ratio whereas the combination of hydrogen and oxygen atoms in hydrogen peroxide is in [tex]2:2[/tex] ratio. So, the properties of water and hydrogen peroxide are different as the arrangement of atoms is different in the compound.
Hence, the correct option is they have different properties because the arrangement of atoms is different.
all organelles need energy to function which cell organelle provides the energy?
The correct answer is chloroplast
2.11 Quiz: Plant and Animal Cells
Chloroplasts produce energy via photosynthesis in plant cells, while mitochondria fulfill this role in both plant and animal cells. The correct answer is chloroplast.
In both plant and animal cells, the mitochondria are the organelles responsible for producing energy. They convert nutrients and oxygen into adenosine triphosphate (ATP), which is used as a source of chemical energy for cellular processes. However, plants have an additional organelle for energy production: the chloroplast. Chloroplasts capture light energy and use it to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. This glucose can then be used by the plant cell for energy or stored for later use.
In the context of the question, while mitochondria are the primary energy-providing organelles in all eukaryotic cells, the question specifies in the context of a quiz on plant and animal cells. Since chloroplasts are unique to plant cells and are essential for photosynthesis, the correct answer in this context is chloroplast, as it is the organelle that provides energy through photosynthesis in plant cells. Mitochondria would still be correct for animal cells or as a more general answer for eukaryotic cells, but the specific answer provided here is chloroplast, which is unique to plant cells.
can you guys help me.
Fill in the blank
1. A(n) chemical _______________ is a description of a reaction using element symbols and chemical
formulas.
2.. _______________ are the starting substances in a chemical reaction.
3.. _______________ are the substances produced by a chemical reaction.
4. Mass is conserved in a chemical reaction because atoms are not _______________ or
_______________.
5.To show that mass is conserved, a chemical equation must be _______________, which means that
the number of each type of atoms must be the same on both sides of the equation.
6. Numbers in front of the symbols and formulas in an equation are called ____________________.
Study the following equation, then answer questions on the lines provided.
____ Al (s) + ____ CuCl (aq) → ____ AlCl3 (aq) + ____ Cu (s)
7. What are the products? ____________________________________________________
8. What are the reactants? ____________________________________________________
what's the formula unit for magnesium and sulfur?
If the pattern of ions shown here for Galena is expanded in every direction, how many sulfide ions would surround each lead ion? How many lead ions would surround each sulfide ion?
If the pattern of ions in Galena is expanded, each lead ion would be surrounded by six sulfide ions, and each sulfide ion would be surrounded by six lead ions.
Galena (PbS) is a crystalline mineral with a specific repeating pattern of ions in its crystal lattice. Each lead (Pb) ion is surrounded by six sulfide (S²⁻) ions in a regular octahedral arrangement. In other words, if you expand this pattern in every direction, each lead ion would be surrounded by six sulfide ions.Conversely, each sulfide ion is also surrounded by six lead ions. This is because the arrangement of ions in a crystal lattice is such that each ion is surrounded by ions of the opposite charge to maintain overall electrical neutrality. In the case of galena, the lead ions and sulfide ions come together to form a highly structured crystal lattice where each ion is coordinated with six ions of the opposite charge.So, to summarize: Each lead ion in galena is surrounded by six sulfide ions. Each sulfide ion in galena is surrounded by six lead ions.For more such questions on ions
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If u could invent one “science gizmo,” what would it be?
My chosen 'science gizmo' invention would be a time machine, using gravity as a conduit to traverse through different periods of time as suggested in general relativity theories.
Explanation:If I had to invent a 'science gizmo,' it would be a time machine influenced by the theories of gravity and time machines as presented in the field of general relativity. A time machine is a concept often seen in science fiction, which manipulates gravity to allow movement through time at a pace or direction different from our current linear understanding. Though only theoretical, the potential to explore different periods of time or leap into the future offers exciting possibilities.
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An open box of bandages is on the floor.Bandages wrappers are found nearby,what chemical treatment do you use.
3. explain the theory of continental drift.
Answer:
Continental drift was a theory that explained how continents shift position on Earth's surface. Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents.
Explanation:
what energy do glow sticks convert to ?
How many moles are in a 12.0 g sample of Fe2O3?
We know that Fe2O3 has a molar mass of 159.69 g / mol, therefore the number of moles of a 12 g sample is:
number of moles = 12 g / (159.69 g / mol)
number of moles = 0.075 mol
The combustion of 3.42 gg of a compound known to contain only nitrogen and hydrogen gave 9.82g of NO2 and 3.85 g of water. Determine the empirical formula of this compound.
The empirical formula of the compound is NH₂, indicating one mole of nitrogen and two moles of hydrogen in the simplest whole number ratio.
Determining the empirical formula:
1. Set up the equations:
Let x be the mass of nitrogen (N) in the compound.
Let y be the mass of hydrogen (H) in the compound.
We know the total mass of the compound is 3.42 g: x + y = 3.42 g (Equation 1).
2. Balance the combustion reactions:
The combustion of nitrogen forms nitrogen dioxide (NO₂): N + O₂ → NO₂.
The combustion of hydrogen forms water (H₂O): 2 H + 1/2 O₂ → H₂O.
3. Use the combustion reactions to calculate the mass of nitrogen:
From the first combustion reaction, we can relate the mass of NO₂ to the mass of N:
9.82 g NO₂ * (1 mol NO₂ / 46 g NO₂) * (1 mol N / 1 mol NO₂) * (14 g N / mol) = x
This simplifies to x = 2.989 g N.
4. Calculate the mass of hydrogen:
Subtract the mass of nitrogen from the total mass to find the mass of hydrogen: y = 3.42 g - 2.989 g = 0.4313 g H.
5. Convert mass to moles:
Divide the mass of each element by its atomic mass to get the number of moles:
N: 2.989 g / 14 g/mol = 0.2135 mol
H: 0.4313 g / 1 g/mol = 0.4313 mol
6. Find the simplest whole number ratio of moles:
Divide both the number of moles by the smallest number of moles (0.2135 mol for nitrogen in this case):
N: 0.2135 mol / 0.2135 mol = 1
H: 0.4313 mol / 0.2135 mol ≈ 2
7. Write the empirical formula:
Based on the whole number ratio of moles, the empirical formula is NH₂.
Final answer:
The combustion analysis of a nitrogen and hydrogen compound resulted in 9.82g of NO₂ and 3.85g of H₂O, leading to the calculation of moles of N and H and determination of the empirical formula as NH₂.
Explanation:
To determine the empirical formula of the compound containing only nitrogen and hydrogen from the combustion results, we will follow a step-by-step process:
Calculate the moles of NO₂ and H₂O produced from the combustion.Deduce the moles of N and H in the original compound using the stoichiometry of the combustion reaction.Find the simplest whole number ratio of moles of N to H to determine the empirical formula.First, we convert the mass of NO₂ and H₂O to moles:
9.82 g NO₂ / 46.0055 g/mol (molar mass of NO₂) = ~0.2134 moles of NO₂.3.85 g H₂O / 18.01528 g/mol (molar mass of H₂O) = ~0.2138 moles of H₂O.Next, we use the moles of NO₂ to find moles of N (one N atom per molecule of NO₂) and the moles of H₂O to find moles of H (two H atoms per molecule of H₂O):
0.2134 moles NO₂ → 0.2134 moles of N.0.2138 moles H₂O → 2 * 0.2138 = 0.4276 moles of H.Finally, we compare the mole ratio of H to N, which gives roughly 2:1 ratio, indicating that the empirical formula of the compound is NH₂.
How does mass affect acceleration due to gravity?
What do seed plants and ferns have in common
Final answer:
Seed plants and ferns are both vascular plants with a dominant sporophyte generation and a system of vascular tissues. Ferns are advanced seedless vascular plants with fronds, while seed plants include gymnosperms and angiosperms that bear seeds, with angiosperms also producing flowers.
Explanation:
Seed plants and ferns share several common features as they are both types of vascular plants. Firstly, both have a system of vascular tissues that conduct water and nutrients throughout the plant. This includes the xylem, which carries water, and the phloem, which distributes sugars and other organic compounds. Additionally, both seed plants and ferns exhibit a life cycle with a dominant sporophyte generation, meaning the diploid stage is the more noticeable and long-lived phase. While ferns reproduce through spores and do not produce seeds or flowers, the two groups share an evolutionary background, with ferns representing an important precursor in the evolution of seed plants.
Ferns are distinguished by their large, divided leaves known as fronds, which develop from fiddleheads, and they tend to thrive in moist and shaded environments. Ferns, which emerged during the Devonian period, are some of the most advanced seedless vascular plants. They also have roots and small structures called sori on the underside of the fronds where sporangia are contained. In contrast, seed plants encompass gymnosperms and angiosperms, which bear seeds and in the case of angiosperms, flowers as well. The presence of seeds in seed plants and spores in ferns is a critical difference between the two groups but does not overshadow their vascular plant commonalities.