someone help w one of these questions. Or if you know all of them surely help.
Answer:
1 A true
B False
C not sure about it False
D False
calculate the density of maple wood if a branch weighing 70. grams has a volume of
of 100 cm^3
Answer:
.70
Explanation:
Density = Mass / Volume
Given Mass: 70g
Given volume: 100cm³
Density = 70 / 100 = .70
What describes an atom that has fewer neutrons than protons and more electrons than protons?
Answer: An atom that has fewer neutrons than protons and more electrons than protons is an anion.
Explanation: Electrons are negatively charged particles, therefore, there excess will be define an ion as anion
give three example of a chemical change
Answer:
Rotting, burning, cooking, are the three example of a chemical change.
Explanation:
burning wood
digesting food
souring milk
If Block A is located on the Moon and Block B is located on
Earth, which of the following is true about the two blocks?
a They have the same mass.
sty
b They have the same weight.
ed a Hint?
C They have the same volume.
d They have the same density.
Answer: they have the same mass
Explanation:weight is calculated
=
Scientific notation -1.8 x 102 x 3.4 x 103
-6.1x105
6.1x105
1.6х100
1.6х100
Answer:
[tex] - 1.8 \times 10 ^{2} \times 3.4 \times {10}^{3} = - 6.12 \times {10}^{5} \\ \\ = - 6.1 \times {10}^{5} [/tex]
I hope I helped you^_^
Explain why the boiling of water is a physical change
Boiling waterBoiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
What does the following element description actually mean? (File below)
A. It means it is an aluminum atom with 27 protons and 13 electrons.
B. It means it is an aluminum atom with 27 electrons and 13 protons.
C. It means it is an aluminum atom with 13 neutrons and 14 protons.
D. It means it is an aluminum atom with 13 protons and 14 neutrons.
E. None of the above.
Answer:
Explanation:
This is an aluminum atom with 13 proton because from what henry said in the year 1914 he said that the number of protons of an element is equal to the number of electrons for an neutral atom..an you expect the number of electrons to be the atomic number.( The number that is used to locate the elements in the periodic table (1869).
And the number of neutron is 13 because form the mass number of the elements and we no that the mass number of an element is the sum of the proton and the neutron..MN=P + N.....so when 13 is substracted from 27 the answer is 14. So the answer is option D.
Which phrase is an accurate description of the process of erosion
The correct option is C. Erosion is the process by which the earth surface get worn down. It involves the removal of soil, rocks or dissolved material from one location and its transportation to another location.
what is chemical reaction and chemical equation how does chemical equation given idea about atom , molecules and elements present in it.
Answer:
chemical reaction is described by a chemical A equation, an expression that gives the identities and quantities of the substances involved in a reaction. A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow.In a chemical change, the molecules in the reactants interact to form new substances. ... When an equation of a chemical reaction is written, it is “balanced” and shows that the atoms in the reactants end up in the products and that no new atoms are created and no atoms are destroyed.
what interests you about science?
Answer:
One of the great things about science is that we are constantly learning new things about the world around us. There's actually something called fact decay where over time more and more of what was considered a fact is disproven or modified. It's also amazing how quickly science is turned into technology
Explanation:
please mark me brainliest pleaseYou need these points more than I do =)
Answer: Uh, thanks.
Explanation:
Which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules?
Answer:
Ar
Explanation:
the last one
The diagram that shows a pure substance which is composed of only individual atoms and not molecules will be: argon gas. Option D is correct.
A pure substance composed of only individual atoms is called an element. In the periodic table, each element is represented by a unique symbol, and its atoms cannot be further broken down into simpler substances by chemical means.
Liquid water: Water (H₂O) is a compound composed of two hydrogen atoms bonded to one oxygen atom. It consists of molecules, not individual atoms.
Hydrogen gas: Hydrogen gas (H₂) is composed of two hydrogen atoms bonded together to form a diatomic molecule. It is not composed of individual atoms.
Carbon dioxide GAS: Carbon dioxide (CO₂) is a compound consisting of one carbon atom bonded to two oxygen atoms, forming a molecule of CO₂.
Argon gas: Argon (Ar) is an element, and in its pure form as a gas, it exists as individual argon atoms (Ar). It is not bonded to any other atoms, and there are no molecules involved. Therefore, argon gas is composed of individual atoms and represents a pure substance.
Hence, D. is the correct option.
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Oxygen has an atomic number of 8. Which of the following could form the nucleus of an atom of oxygen?
6 protons and 8 neutrons.
4 protons and 4 neutrons. 6 protons and 2 neutrons. 8 protons and 10 neutrons.
Answer:
Answer: 8 protons and 8 neutrons
Explanation:
The mass number of oxygen is 16
Atomic number is 8
but proton number = atomic number = 8 protons
[tex]neutrons = mass \: number - atomic \: number \\ [/tex]
neutrons = 16 - 8 = 8 neutrons.
The nucleus of an atom of oxygen typically contains 8 protons and 8 neutrons specifically. So, none of the above options is correct.
What is the formula for calculating the atomic number?The atomic number may be defined as the number of a chemical element in the periodic table through which the elements are arranged in order of increasing the number of protons in the nucleus.
The atomic number of an element = The number of protons in the nucleus of an atom.
Now, according to the question,
If Oxygen has an atomic number of 8, that means the number of protons = 8.
The number of neutrons can be calculated as follows:
Neutrons = mass number - the atomic number.
= 16 - 8 = 8 neutrons.
Therefore, the nucleus of an atom of oxygen typically contains 8 protons and 8 neutrons specifically. So, none of the above options is correct.
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Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?(1 point)
Atoms can form new substances.
Atoms are indivisible.
Atoms are small.
Atoms can join together.
The part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments is; "Atoms are indivisible".
One of the major postulates of the Dalton's atomic theory is that the atoms of elements are "indivisible".
This idea resounds from the earliest ideas of Greek philosophers concerning the atom.
Through the cathode-ray tube experiments, J.J. Thomson discovered sub-atomic particles.
This nullified the idea that atoms are indivisible.
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Proses yang manakah mempunyai kadar tindak balas yang paling tin gi? Which process has the highest rate of reaction? A Fotosintesis Photosynthesis B Respiration Respiration C Pembakaran Combustion D Rusting Pembakaran
this is so CONFUSING WTH anyone kind to help with those two questions just answer how much you know, I’ll still brainlist it’s urgent!
Answer:
4. mutualism - both benefit
5. Commensalism- one benefits while the other is not affected
"Mutualism is a symbiotic relationship in which both species benefit. Commensalism is a symbiotic relationship in which one species benefited while the other species is not affected."
Plz answer this question
Answer: i dont know why the metal was chosen, but the original metal used on the statue of liberty was bronze :)
Explanation:
Physical Science is the study of ____.
energy
work
how matter and energy interact
matter
Answer:
HOW MATTER AND ENERGY INTERACT
Explanation:
Physical science is the study of matter and energy. That covers a lot of territory because matter refers to all the “stuff” that exists in the universe. It includes everything you can see and many things that you cannot see, including the air around you. Energy is also universal.
No Spam!!!! PLEASE HURRY!!! What is the base name for the following compound?
C-C-OH
Answer:
hydroxide, I think
Explanation:
Balance and classify the following equations as synthesis, decomposition, single replacement, double replacement, or combustion: a. C4H10 + 02 -> CO2 + H20 Reaction Type: b. ___ HNO3 + Mg(OH)2 -> Mg(NO3)2 + H20 Reaction Tyne.
The brackets are indicating a(n) _____ bond. A three-dimensional model of two water molecules with their interaction. The oxygen atom of one molecule is labeled with a delta minus charge. One of the hydrogen atoms of another water molecule is labeled with a delta plus charge. The brackets between these 2 atoms unite charge labels and dots between them. hydrogen single (nonpolar) covalent ionic polar covalent hydrophobic
The brackets are indicating a hydrogen bond.
A hydrogen bond is formed when hydrogen is bonded to highly electronegative atom in a molecule.
In water, hydrogen is bonded to oxygen which is highly electronegative hence the bond is polar.
This is the cause of the delta minus charge and delta plus charge. The brackets are indicating a hydrogen bond between water molecules.
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when O ^-3 converts into O^-2 then what occurs
O^{-3} means Oxygen ion has taken 3 electrons .
If it converts to 0^-2 then It loses an electron .As it has 8 electrons and it is given by 2 electrons it is now a noble element as its orbit has been filledWhat was important about the copernican revolution?
A. It was the first time a new theory was published in a book.
B. The scientific community never accepted it.
C. It demonstrated that scientific understanding was always changing.
D. It caused an immediate shift in accepted ideas.
an oven adds 2260 j heat to a zinc tray that weighs 195g of the tray starts at 25 what is the final temperature of the tray
Answer: Assuming 25 is 25C, 54.9C
Explanation: The specific heat of zinc is 0.388 J/gC. With 195 grams, we see that for the whole tray, the temperature will change by 1 C for every 75.66J, since (0.388J/gC)*(195g) = 75.66 J/C.
Thus, (2260J)/(75.66J/C) = 29.9 C increase. Add that to 25 to yield 54.9 C (or K, if the 25 was in Kelvin).
humans are heating up the Earth's atmosphere is this an example of the law or theory support your answer
Answer:qui
qzasui
Explanation:
qzasui
arlon drank 500 mL of softdrink which had a mass of 450 g.
a. 1.11 g/mL c. 0.9 g/mL
b. 50 g/mL d. 225000 g/mL
Answer:
0.9 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]d = \frac{m}{v} \\ [/tex]
where
m is the mass
v is the volume of object
From the question we have
m = 450 g
v = 500 ml
[tex]d = \frac{450}{500} = \frac{9}{10} \\ = 0.9[/tex]
We have the final answer as
0.9 g/mLHope this helps you
Answer:
B) g/mL
Explanation:
Mass of Oxalic acid (solute) = 11g
Mass of Solution = 500ml
Density = 1.1 g/ml
We know that
Mass % of solute =
Massofsolution
Massofsolute×100
×
50
Mass of solution =
Volume of solution×
Density of solution
Mass of solution =
500×
1.1=
50×
11g
Mass % of the solute =
11×50
11×100
=
2%
Rajah 3 / Diagram 3 Antara industri berikut yang manakah menggunakan mikroorganisma ini? Which of the following industries uses this microorganism?
Answer:
bacteria is used by industries . Because some bacterias are very friendly
Which of the following is not considered a base unit according to the SI units of measurement
gram is not the SI unit of measurement. Thus option A is correct.
what is unit of measurement?
The unit of measurement can be defined as the magnitude of quantity that is used as the measurement for the same form, adopted and specified by the law or convention.
We can quantify different types of measurement by multiple measuring unit and this unit is called as the standard quantity of the physical property can be used as the factor for expressing the quantity of that specific.
There are apparent limitations of single unit of measurement like the use of the measurement of the same unit for the distance between two cities and the length of a pencil is impractical.
On the other hand length and weight, and volume are measured in different unit system like CGS system of units, the FPS system of units, the MKS system of units, and the SI system of units etc.
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sud
How do the molecules in a solid, liquid and gas compare to each other?
Answer:
Loading..
Explanation:
