Answer:
A limitation of models in science is that they are usually simplified versions of the real situation or concept.sometimes, models spark debates leading to new and improved models.A model may be used when it is impossible to create the conditions necessary to test a concept of theory.
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organize the following elements in order of increasing atomic radius (Ge, He, Sr, O, Ba)
Answer:
He
O
Ge
Sr
Ba
Explanation:
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.
In general, the size of an atom will decrease as you move from left to the right of a certain period.
what is the first step of scientific method A.Hypothesis
B. question
C.control
D.procedures
Answer:
B
Explanation:
Question. You need to ask questions before you can set up to perform an experiment.
The maximum amount of statie friction between this chair
and the floor is 175 N.
Which action would cause the chair to move to the left?
A. Applying 100 N of force to the chair from the left
B. Applying 200 N of force to the chair from the left
O c. Applying 200 N of force to the chair from the right
O D. Applying 100 N of force to the chair from the right
Answer:
C
Explanation:
A p ex
K+ Cl2 → КСІ balance equation
the number of protons will tell you what elements it is. T or F plzz help
Answer:
True
Explanation:
There are two ways to tell elements apart from each other: the atomic number or the number of protons. The atomic number tells the number of protons in the element.
For example:
There are two given elements. One has 3 protons and an atomic number of 3 while the other has 7 protons and an atomic number of 7. Which one is Lithium?
Lithium has an atomic number of 3, which means it has three protons, which means Lithium is the one with 3 protons.
explain how to balance the chemical equation, KClO3 ⟶ KCl + O2 and include all steps
The balance of chemical equation : 2KClO₃ ⟶ 2KCl + 3O₂
Further explanationEqualization (balance) of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction
[tex]\tt KClO_3\Rightarrow KCl+O_2[/tex]
1. Coefficient
KClO₃ ⟶ aKCl + bO₂
2. Equation
K ⇒ left =1, right=a ⇒a=1
Cl⇒ left =1, right=a ⇒a=1
O ⇒ left = 3, right = 2b ⇒3=2b, b = 1.5
The equation turns into :
KClO₃ ⟶ KCl + 1.5O₂
multiplied by 2
2KClO₃ ⟶ 2KCl + 3O₂
Which of the following statements regarding the moon and Earth is correct? Question 9 options: A) The moon is older than Earth by approximately 300 million years. B) Earth is tidally locked, while the moon spins on its axis. C) Earth and the moon have nearly the same mass. D) Earth and the moon are nearly the same age.
The statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).
When did the Moon form?The Moon formation refers to the geological period of time in which our natural satellite emerged as an independent celestial body.
It has been proposed that the Moon emerged first compared to the Earth (approximately 300 million years).
In conclusion, the statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).
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What is the difference between a compound and a mixture?
Group of answer choices
A compound is just a mixture of elements.
A mixture can be physically separated into its components; a compound cannot be physically separated into its components.
The components of a mixture do not have the same properties individually as they do when mixed.
A compound can be physically separated into its components; a mixture cannot be physically separated into its components.
Answer:
Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances. Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.
Answer:
The answer is a mixture can be physically separated into its components; a compound cannot be physically separated into its components.
What mass of ethanol will All
a 250.0 ml container if its
density is 0.789 g/ml?
Answer:
The answer is 197.25 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 250 mL
density = 0.789 g/ml
So we have
mass = 250 × 0.789
We have the final answer as
197.25 gHope this helps you
Which of the following is NOT a characteristic of a compound?
A. has different properties from the elements that formed it
B. pure substance made of two or more elements
C. can be represented by a chemical formula
D. different samples have different properties
Answer:
I think it's D
sorry if I'm wrong.
Explanation:
Options that are not characteristics of compound in the question is D. different samples have different properties.
A compound can be regarded as a substance which is formed by chemical combination of two or more elements.Examples of compound are water ( H2O), Sodium chloride ( NaCl)Some of the properties of a compound are;
A compound will always has a different properties which is different from the properties of each of the elements making up the compound.A compound are formed as a result of two or more elements that combined chemically.A compound can be identified with its chemical formula.Therefore, option D is correct because a compound will only has its own properties not that
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Which of the following is the conjugate acid of H2P04- ?
A. HAP04
O B. PO 3-
O C. HP04-2
O D. H3PO4
Answer:
phosphoric acid H3PO4
The conjugate acid of H₂PO⁴⁻ is H₃PO₄. Therefore, option D is correct.
A conjugate acid is a species that is formed when a base accepts a proton (H⁺). It is the species that is one proton (H⁺) more acidic than the original base.
The base is the species that can accept a proton (H⁺), and the conjugate acid is the species that is formed when the base accepts the proton. The conjugate acid has one additional proton compared to the base.
Conjugate acids play an important role in acid-base reactions as they are formed when bases accept protons, and they can donate protons in subsequent reactions to regenerate the original base.
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1 point
Nitrogen has three occurring isotopes: Nitrogen-13, Nitrogen-14, Nitrogen-15. Which isotope is the most abundant?
Explanation:
Nitrogen-14 is the most abundant isotopes of Nitrogen.
Find the percent of oxygen in CaClO3)2 Show your work
If a sample of copper is 215g, how many moles of copper atoms are in the sample?
Answer:
3.38 moles.
Explanation:
The following data were obtained from the question:
Mass of copper (Cu) = 215 g
Number of mole of copper (Cu) =...?
The number of mole of copper (Cu) in 215 g can be obtained as follow:
Mass of copper (Cu) = 215 g
Molar mass of copper (Cu) = 63.55 g/mol
Number of mole of copper (Cu) =...?
Mole = mass /Molar mass
Mole of Cu = 215/63.55
Mole of Cu = 3.38 moles
Therefore, 3.38 moles of copper (Cu) is present in the sample.
The kinetic energy of a moving object depends on its mass and its
a. volume.
b. velocity.
c. distance.
d. acceleration.
If all the deer disappeared from this community, which change would be most
likely to occur?
Answer:
i think the grass population would decrease
Explanation:
Answer:
The Coyote population would decrease
Explanation:
Compounds are created when atoms of different elements _____.
1.form chemical bonds
2.have different chemical properties
3.form physical bonds
4.have similar chemical properties
Answer:
1.form chemical bonds
3. The presence of the same
a. fossils
b. rocks
on several continents supports the hypothesis of continental drift.
c. neither a norb
d. both a and b
Answer:
with someone or in the same place as them
Explanation:
Egg + Heat
Proof of a Chemical Reaction
Answer:
Water+Heat
proof of physical reaction
Explanation:
Chemical reactions are reactions that can't be undone ex cooking and egg.
Physical reactions are reactions that can be undone ex boiling water.
Answer:
Egg + Heat = Chemical Change
Explanation:
This is a chemical change because it cannot be undone. Once it changed its form you could not revert it back to its original self.
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If a gold bar is 16,000 g mass and 800 cm^3 volume what is the density?
Answer:
The answer is 20 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 16,000 g
volume = 800 cm³
We have
[tex]density = \frac{16000}{800} = \frac{160}{8} \\ [/tex]
We have the final answer as
20 g/cm³Hope this helps you
Why is Graphite soft
Answer:
Graphite is soft because it has weak inter molecular forces between its layers.
What all indicates a CHEMICAL change? *
A Solid melting into a liquid
After the change the substance is still reactive with oxygen
One substance becomes two new substances
The melting point was 100 deg C but after the change the melting point was 256 deg
C.
one substance becomes two new substances
What element is the only Noble Gas in the s-block?
Answer:
Helium
Explanation:
Answer:
helium i guess i m not sure
how long will take an object traveling at 25 m/s to reach a distance of 125 meters?
Answer:
5s
Explanation:
The rows in the periodic table are called periods.
What is true about elements in the same period?
Answer:
elements in the same period have the same number of shells
the period number the element is in, that is the number of shells it has.
A star's mass determines the —
A) shape of a Star
B) location of a star
C) length of its lifecycle
D) galaxy it belongs to
Identify the atom
H₄
CH₄
N
Answer:
Organic Molecule.
Explanation:
Any molecule with C atoms and H atoms are organic molecules in chemistry.
Examples could be C₄H₅, C₉H₁₈O₆, C₅H₁₂N.
I need help with that box
I hope this helps.
the first line would be SN, 50, 50, 69
second line would be PT, 78, 78, 117
third line would be MO, 42, 42, 54
fourth line would be NI, 28, 28, 31
fifth line would be U, 92, 92, 146
Which can change from one state of matter to another at the temperatures and pressures experienced at Earth’s surface?
oxygen
carbon dioxide
water
nitrogen
Why were enslaved Africans in high demand in the southern colonies?
Answer:
Slaves were in high demand in the southern colonies because they were the main source of labor. ... Bacon and others colonists wanted to take the Natives land.
Explanation:
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