A scientist is observing onion cells and human cheek cells under a microscope.
Which observation does she most likely make?
⚪ The onion cells have lysosomes, and the cheek cells do not.
⚪ The cheek cells have larger vacuoles than the onion cells.
⚪ The cheek cells have a nucleus, and the onion cells do not.
⚪ The onion cells have a cell wall, and the cheek cells do not.
by the way this is science
please answer this quick
Answer:
The onion cells have a cell wall and the cheek cells do not.
Answer:
The onion cells have a cell wall and the cheek cells do not.
You placed 18.4 g of aluminum shot into a graduated cylinder containing 25.50 mL of water. If the water level rises to the 39.10 mL mark, what is the density of aluminum?
Answer:
The answer is 1.35 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of aluminum = 18.4 g
volume = final volume of water - initial volume of water
volume = 39.10 - 25.5 = 13.6 mL
The density of the metal is
[tex]density = \frac{18.4}{13.6} \\ = 1.352941176...[/tex]
We have the final answer as
1.35 g/mLHope this helps you
1Explain why the ions of sodium, magnesium and aluminium are smaller than their corresponding atoms.
2) Explain why there is a large increase in ionic radius from Al3+ to P3-
3) what do all the ions from N3- to Al3+ have in common?
Answer:
I think magniesum is combined with the sulfer which is why its at 3 omegas.
Hope this helps!
Explanation:
please help me and explain if you can
Answer:
Density of iron shot is 7.92 g/mL.
Explanation:
Given data:
Mass of water + iron + graduated cylinder = 94.74 g
Mass of water + graduated cylinder = 66.24 g
Volume of water = 45.50 mL
Volume of water + iron shot = 49.10 mL
Density of iron = ?
Solution:
First of all we will calculate the volume of iron shot.
Volume of iron shot= (Volume of water + iron shot) - Volume of water
Volume of iron shot= 49.10 mL - 45.50 mL
Volume of iron shot= 3.6 mL
Now we will calculate the mass of iron shot.
Mass of iron shot = (Mass of water + iron + graduated cylinder ) - Mass of water + graduated cylinder
Mass of iron shot = 94.74 g - 66.24 g
Mass of iron shot = 28.5 g
Now we will calculate the density of iron shot.
d = m/v
d = 28.5 g / 3.6 mL
d = 7.92 g/mL
Density of iron shot is 7.92 g/mL.
select the correct answer
Answer:
all atoms have the same number of protons
why each component does not change at all even when combined?
Answer:
This question is incomplete
Explanation:
This question is incomplete. But generally in chemistry, if there is no change in properties of the components of a substance, that substance is said to be a mixture. A mixture is a substance that contains two or more constituents that are physically combined and independently distinct. For example, a mixture of salt and water to form salt solution can still be retrieved as salt and water separately despite been in a combined form earlier. This is because this components/constituents (water and salt) are physically combined.
A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.
What will most likely happen next?
Scientists worldwide will reject atomic theory because of the new results.
The scientist will change his results to agree with the accepted theory.
Other scientists will reject the results because they do not agree with the theory.
The scientist will repeat the experiment to make sure that his results are reliable.
Answer:
When the results of a new experiment to test atomic theory do not agree with the theory, scientist will repeat the experiment to make sure that his results are reliable.
Explanation:
In the scientific context, each new experiment must be performed with precision and following the steps of the scientific method.
An experiment that does not provide reliable data to demonstrate a theory must be reviewed in detail and performed again to confirm the data obtained in the first attempt.
A theory is a postulate that tries to explain a natural phenomenon, but whose argument can be discussed or does not have the acceptance of a law. When the theory is proven and there are no arguments against it, it can be universally accepted and becomes a law.
The other options are not valid due to:
Scientists worldwide will reject atomic theory because of the new results. A theory cannot be discarded without solid arguments or evidence in order to dismiss it and establish a new one.The scientist will change his results to agree with the accepted theory. This would be an unethical procedure and unacceptable to the scientific community.Other scientists will reject the results because they do not agree with the theory. The opinion of other scientists is not enough to dismiss a theory, if it has a valid scientific basis.4. What do radio telescopes use to gather and focus radio waves?
A a very large mirror
B a huge dish
C a tall rotating tower
D a set of glass lenses
The statement of radio telescopes use to gather and focus radio waves "a tall rotating tower."
What are radio waves?Radio waves are a form of electromagnetic radiation that are commonly used in communication devices like television, mobile phones, and radios.
What is radio telescope?A radio telescope is a radio receiver and antenna that detects radio waves from astronomical radio sources in the sky. Radio telescopes come in a variety of shapes and sizes, depending on the type of radio waves they detect. An antenna system that detects radio-frequency radiation emitted by extraterrestrial objects such as stars, galaxies, and quasars with wavelengths ranging from around 10 meters (30 MHz) to 1 mm (300 GHz).The parabolic dish antenna is the most adaptable and powerful type of radio telescope.
The parabola is a helpful mathematical form that causes incoming radio waves to bounce up to a single point above it, which is known as a focus. The parabolic surface is equatorially mounted on a tall rotating tower in certain radio telescopes, with one axis corresponding to the Earth's rotation axis.
Equatorial mounts are appealing because they allow the telescope to track a place in the sky as the Earth rotates by moving the antenna around a single axis that is parallel to the axis of rotation of the Earth.
Hence the correct answer is C.
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Which of the following electron configurations are written incorrectly?
1s22s32p6
1s22s22p63s23p64s23d5
1s22s22p63s23p3
4s23d104p7
3s1
2s22p4
Answer:
The electronic configuration that are incorrectly written is 1s²2s³2p⁶, 4s²3d¹⁰4p⁷, 3s¹ and 2s²2p⁴.
Explanation:
The electronic configuration of the elements corresponds to how all the electrons of an element are arranged in energy levels and sub-levels.
There are 7 energy levels —from 1 to 7— whose sublevels are described as s, p, d and f.
All electronic configurations begin with the term "1s" —corresponding to the sublevel s of level 1— so 4s²3d¹⁰4p⁷, 3s¹ and 2s²2p⁴ are incorrectly written. In addition, 4s²3d¹⁰4p⁷ is written incorrectly because is impossible to jump from the sublevel "s" to the sublevel "d" —which is found from level 3 and up— without passing through the sublevel "p".
In the case of 1s²2s³2p⁶, the wrong thing is that the sublevel "s" can only hold two electrons, not three.
The other options are correctly written.
point
2) A car travels 60 m to the right and then 30 m to the left. What distance
has the car traveled?
Answer:
90 m
Explanation:
60 m plus 30 m=90 m simple math
If a car travels 60 meters to the right and then 30 meters to the left, then the total distance by the car would be 90 meters because the distance traveled by a body is independent of the direction of the motion it only depends only on the magnitude.
What is displacement?Displacement describes this shift in location and is calculated with the help of the initial and final position of the object.
As given in ṭhe problem If a car travels 60 meters to the right and then 30 meters to the left,
The total distance traveled by car = 60+30 meters
=90 meters
The total displacement of the car would be 90 meters.
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In the equation below how many molecules are there?
Ba(OH)2
Answer:
one
Explanation:
I think it one because molecule is the combination of non metals but I am not sure
What properties would detergents need to have in order to help remove oil from birds?
Answer:
They have a hydrophilic and hydrophobic end
Explanation:
The structure of detergents enables them to perform their functions as a cleansing agent for removing stains. Detergents are more preferable to soap for cleaning because they are indifferent to water hardness and can retain their cleansing properties in any medium.
A typical detergent has a hydrophilic head (-SO₃⁻Na⁺) and a hydrophobic tail, a long chain hydrocarbon from C₁₂ to C₁₈ or a benzene ring having a long chain hydrocarbon as its substituent.
This structure enables the hydrophilic head to bind with water and makes the detergent soluble. The other head head attaches to the fabric, in this case the feather.
The property that makes detergents able to remove stains lies in the structural arrangement of their component elements.
11.select the correct description for the atoms below
Answer:
maybe a
Explanation:
When measuring the volume of water in a graduating cylinder, you measure_____.
A. at the top of the meniscus
B. from the bottom of the meniscus
C. from the exact top of the liquid
D. the average between the volume at the top of and the bottom of the meniscus
Answer:
The answer is B: from the bottom of the meniscus
Explanation:
Correct on edge 2020 :)
Which of the following is a possible genotype for the offspring
Answer:
C
Explanation:
The genotype of an organism is the combination of alleles it has at a particular locus. In contrast, the phenotype is the observable characteristics that are produced by the genotype.
B and D are phenotypes, and are therefore not possible genotypes.
In a cross between tt ff and TT FF, the only alleles that tt ff can pass on are t/f, and the only alleles TT FF can pass on are T/F. Therefore, the only possible genotype is Tt Ff
13
Which one is heavier? 1 mole of Pbd,, 1 mole
of H, and 1 mole of Pb(NO3)2
A. Pbd
В. Н,
C. С None of them
D. Pb(NO3)2
Answer:
1 mole of Pbd - 239.3 g
1 mole of H - 1.008 g
1 mole of Pb(NO3)2 - 331.2 g
So D
Explanation:
1 mole of lead nitrate is heavier as it is a compound and is composed of three different kinds of atoms.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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9. Which is not a form of electromagnetic radiation?
O radio waves
O gravity
O gamma rays
O visible light
Answer:
Gravity
Explanation:
Electromagnetic radiation is self-sustaining energy with electric and magnetic field components.
Fossil fuels are an important natural resource used by society. Which of the following best describes fossil fuels?
a.
They are any liquid fuel derived from once-living matter.
b.
They are organic fuels derived from ancient plants and animals.
c.
They are fuels in which dinosaur fossils are commonly found.
d.
They are naturally occurring inorganic fuels like coal and petroleum.
Please select the best answer from the choices provided
A
B
C
D
Answer:
B.
They are organic fuels derived from ancient plants and animals.
Explanation:
Edg 2020
The statement 'they are organic fuels derived from ancient plants and animals' best describes fossil fuels (Option B).
What are fossils?Fossils are dead organisms (either dead plants or animals) that once lived on the surface of the Earth planet.
Fossil fuels are energy-rich organic materials that decomposed by suffering pressure on the Earth's crust for millions of years.Some examples of fossil fuels include, among others, natural gas, oil shales, coal, petroleum, etc.In conclusion, the statement 'they are organic fuels derived from ancient plants and animals' best describes fossil fuels (Option B).
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When writing 6,020,000 in scientific notation, it is correctly written as:
1. 6.02 x 10 ^6
2. 6.02 x 10 ^-6
3. 0.602 x 10 ^-8
4. 602. x 10 ^6
Answer:
6.02*10^6 is ans
it mean (1)is correct
Scientific theories are always
Answer:
Scientific theories are always testable. A theory may be changed as a result of new observations.
Explanation:
Hope this helps !
2. A lab group turned in their experiment and had measured the mass of their sample
to be 3.15 g. The teacher had asked for them to make a sample of 3.10 g (the
accurate value). What is their percent error?
Answer:
1.61%.
Explanation:
The following data were obtained from the question:
Measured mass = 3.15 g.
Actual mass = 3.10 g
Percentage error =.?
The percentage error of the group can be obtained by using the following equation below:
Percentage error = |Actual mass – Measured mass| / Actual mass × 100
Percentage error = |3.10 – 3.15| /3.10 × 100
Percentage error = 0.05/3.1 × 100
Percentage error = 5/3.1
Percentage error = 1.61%
Therefore, the percentage error of the group is 1.61%.
Which of these statements is not true?
A)Atoms of the same element can have different masses
B)The nucleus of an atom has a positive charge
C)Atoms of isotopes of an element have different numbers of protons
D)Atoms are mostly empty space
Answer:
C
Explanation:
should be different numbers of neutrons
The atomic isotopes have the same number of electrons and protons but varying neutrons. Thus, option C is correct.
Atoms are the smallest unit of matter. They are composed of electrons, neutrons, and protons as subatomic particles.
The structure of the atom has been constituted of a centrally situated positively charged nucleus, and negatively charged electrons revolving around it. The atom has an empty space with revolving electrons.
The atoms with the same atomic number and different mass have been termed isotopes. The isotopes have the same number of electrons and protons but varying neutrons. Thus, option C is correct.
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What is different about the particles in the three state of matter?
Answer:
liquids, gases, solids
Explanation:
Solids atoms are tightly packed which causes them to have no room and little vibration. Gases have a lot of room which causes them to bounce. And liquids have H2.o which means there atoms are spread very far apart. HOPE THIS HELPED!!
Need help can somebody help me please
Answer:
A. filtration
B. distillation
C.magnet
D. evaporation
Explanation:
Match the terms to their definition. 1. element one of the starting substances (ingredients) that is involved in a chemical reaction 2. heterogeneous the substance that does the dissolving 3. homogenous a substance that is made from only one type of atom. 4. product composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture 5. reactant even distribution of parts throughout the whole mixture; not easily separated into individual components 6. solute the substance that is dissolved 7. solvent the substance created as a result of a chemical reaction
Answer:
1. Element - a substance that is made from only one type of atom
An element is made up of only one type of atoms and known for its unique properties than other elements.
2. Heterogeneous - composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture
3.Homogenous - even distribution of parts throughout the whole mixture; not easily separated into individual components.
4. Product - the substance created as a result of a chemical reaction
Products are the final substance that created as a result of a chemical reaction.
5. Reactant - one of the starting substances (ingredients) that is involved in a chemical reaction
Reactants are the starting substance that takes part in a chemical reaction.
6. Solute - the substance that is being dissolved.
A Solute is a substance that is being dissolved in the solvent to make a solution.
7. Solvent - the substance that does the dissolving
A solvent is the medium in which the solute is being dissolved to make the solution.
A homogeneous mixture, like a solution, has an even distribution of its components throughout the whole mixture. It is not easily separated into individual components. On the other hand, a heterogeneous mixture, like a mixture of oil and water, has dissimilar parts that can be separated easily, and the components are unevenly distributed in the mixture.
1. Reactant: one of the starting substances (ingredients) that is involved in a chemical reaction.
2. Solvent: the substance that does the dissolving.
3. Solute: the substance that is dissolved.
4. Homogeneous: even distribution of parts throughout the whole mixture; not easily separated into individual components.
5. Heterogeneous: composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.
6. Element: a substance that is made from only one type of atom.
7. Product: the substance created as a result of a chemical reaction.
Let's match the terms to their definitions:
1. Element: A substance that is made from only one type of atom.
2. Reactant: One of the starting substances (ingredients) that is involved in a chemical reaction.
3. Product: The substance created as a result of a chemical reaction.
4. Solute: The substance that is dissolved.
5. Solvent: The substance that does the dissolving.
6. Homogeneous: Even distribution of parts throughout the whole mixture; not easily separated into individual components.
7. Heterogeneous: Composed of dissimilar parts which can be separated easily and which are unevenly distributed in the mixture.
For example, if we consider the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), hydrogen gas and oxygen gas would be the reactants. Water would be the product. In this reaction, hydrogen gas and oxygen gas are the starting substances that undergo a chemical reaction to form water.
In a solution, such as saltwater, the salt (solute) dissolves in the water (solvent). The salt is the substance that is dissolved, and the water is the substance that does the dissolving.
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Which example is a type of matter?
A. My science teacher
B. Water
C. My chromebook
D. All of these are types of matter.
Answer:
D
Explanation:
I hope this will help you
What does this represent about the type of change
happening in the container?
O A chemical change started immediately and finished
at eight minutes.
O A non-chemical change started immediately and
finished at eight minutes.
O A chemical change occurred at four minutes.
O A non-chemical change occurred at four minutes.
Answer:
A) a chemical change started immediately and finished at 8 minutes!!Explanation:
it is stated that the substance slowly starts turning blue, not that it suddenly started changing!! and, this couldn't be a non-chemical change because there are very few chemicals that can turn a completely different color when the two substances were the same color!!! ^_^ please let me know if messed anything up
Answer:
A
Explanation:
on edge
Which properties change the composition of a substance? A physical properties
B chemical properties C chemical and physical properties D neither chemical nor physical properties
Answer:
chemical properties
Explanation:
chemical properties did change the composition of substance, so it cannot go back to original anymore, such as burning, rusting, etc.
I took the test before. I got all the answer correct and got 100% score.
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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8
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Which biomes would be found nearest to the equator?
tropical rain forests and savannas
tundras and taigas
tropical rain forests and taigas
tundras and savannas
PLS HELP ASAP
I’LL GIVE BRAINLY
Answer:
tropical rain forests and savannas
Explanation:
Tropical rainforests are found near the equator due to the amount of rainfall and the amount of sunshine these areas receive. ...
savannas-Because of their warm climate requirements, savannas tend to be found closer to the equator, which marks the halfway point between the north and south hemispheres of the earth. Because this area gets direct sunlight more of the year than the north and south extremes, the temperature doesn't change much.
What is the only true way to tell if a chemical reaction has occurred?
CFU
Answer:
change of colour
Explanation:
