Answer:B
Explanation:
If you can run 3 miles in 19 minutes. What is your pace in kilometers per hour?
Report your answer with 3 significant figures. (1 km = 0.621371 miles)
Answer:
10.1389
Explanation:
If an atom has 18 protons,17 neutrons,and 19 electrons what is the atom electrical charge?
A +2
B +1
C -2
D-1
Answer:
D: -1
Explanation:
18 protons so +18
19 electrons -19
neutrons dont count there neutral
-19+18= -1
Answer: D: -1
Explanation: All protons have a +1 charge, neutrons are neutral, and electron have a -1 charge. Therefore it can be concluded that if the atom has 18 protons which all have +1 charge and 19 electrons which all have -1 charge, then the atom will have a -1 charge since 18-19=-1
Why do elements form chemical bonds?
Answer:
to make them more stable by filling up electrons
Gold atoms can be identified based on the number of which subatomic particles?
A.neutrons
B.electrons
C.nuclei
D.protons
Answer:
D.protons
Explanation:
Gold is a chemical element and it is the element 79 on the periodic table. Thus, it has an atomic number of 79. The chemical symbol for Gold is Au, it is chemically classified as a transition metal and as a solid at room temperature.
Generally, the chemical element Gold is known to be malleable, ductile and a good conductor of electricity and heat. Also, it is a non-toxic chemical element with a beautiful lustrous sheen.
Gold atoms can be identified based on the number of protons (79) because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.
The decay of radium-226 produces an isotope
of the element radon and alpha radiation. The
atomic number of radium (Ra) is 88; the atomic
number of radon (Rn) is 86. Write a balanced
equation for this transformation.
Answer:
²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He +⁰₀γ
Explanation:
This radioactive decay occurs when the unstable radium-226 atom wants to lose energy by emitting an alpha particle from its nucleus which is an helium nucleus with no electron. The radium (86) is transformed to radon(Rn) where the atomic number of radium (88) is reduced by two units into radon, Rn (86) and mass number reduced by 4 units.
The equation for the transformation is;
²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He +⁰₀γ where
²²⁶₈₈Ra ---------radium-226
²²²₈₆Rn -------radon-222
⁴₂He ----------alpha particle
⁰₀γ ------------energy
Note that ⁴₂He can also be written as : ⁴₂∝
Answer:
it is alpha decay
Explanation:
im albert einstien
Find the volume of a gold ring that has a mass of 12.00 grams. The density of gold is 19.30 g/mL. The volume is
Answer:
The answer is 0.622 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass = 12 g
density = 19.30 g/mL
We have
[tex]volume = \frac{12}{19.30} \\ = 0.62176165...[/tex]
We have the final answer as
0.622 mLHope this helps you
What did John Dalton contribute to the understanding of the atom?
John Dalton contribute to the understanding of the atom that all matter was composed of atoms, indivisible and indestructible building blocks.
While all atoms of an element were identical, different elements had atoms of differing sizes and mass.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element.
An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.
Dalton based his theory on the law of conservation of mass and the law of constant composition.
The theory states that all matter is made of atoms, which are indivisible.
(1) All matter is composed of tiny, indivisible particles, called atoms, that cannot be destroyed or created.
(2) Each element has atoms that are identical to each other in all of their properties.
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I will give 25 points and make them brainlest if they solve this.
A carbon atom that is a part of your body could very well have been part of a dinosaur millions of years ago. What BEST explains this?
A The carbon atoms that are found in current living things are developed when the organism is produced.
B Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled.
C This could not be explained because carbon found in our bodies could not have a part of any previous organism.
D Carbon atoms are genetically passed through the evolution of organism.
Answer:
B - Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled.
Carbon atoms found in current living things are the same carbon atoms that have always been a part of living things, they are just recycled. Hence, option B is correct.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Dinosaurs were the most dominating organism in that time period.
The dinosaurs and the present-day human beings have certain similar characteristics. Some of them are as follows-
They both have control over their body movement.They have a well-functioning brain.They are sharp and active.The dinosaurs were dominant during the Jurassic period and the humans are dominating at the present on earth.Hence, option B is correct.
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An ionic bond occurs between a ___ and ___
Answer:
An ionic bond occurs between two opposite charges are attracted
Explanation: Two opposite charges are attracted to each other
Which of these is a chemical property of aluminium
Answer:
Option 1
Explanation:
Density of 2.70 g/cm^-3
Answer:
Explanation:
For it’s actually ( Aluminium is highly reactive )
what is a divalent union
Answer:
. A divalent cation is an cation with valence of 2+. This type of ion may form two chemical bonds with anions.
Explanation:
Please mark as brainliest
Does anybody know this question
5. How does the temperature change as altitude increases?
Answer:
when the altitude increases the temperature decreases. it's happens because the pressure changes(below the stratosphere)
Explanation:
+altitude------> - pressure(ar above us)---> -temperature
11. Which element forms an ionic compound when it reacts with lithium?
How many Protons, electrons, and neutrons are in Dysprosium?
EASY POINTS?
Answer:
Number of Protons - 66
Number of Neutrons - 97
Number of Electrons - 66
Explanation:
You're welcome :3
Which of the following would be true when iodine gains valence electrons?
A. it would form a cation with a -1 charge.
B. it would form a cation with a +1 charge.
C. it would form a anion with a -1 charge.
D. it would form a anion with a +1 charge.
Answer:
C. it would form a anion with a -1 charge.
Explanation:
The elements of group 17 are called halogens.
These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.
They require only one electron to complete the octet and get stable. Thus they form anion with charge -1 when they gain electron.
l + e⁻ → I⁻
They form ionic compound with alkali and alkaline earth metal such as sodium chloride (NaCl), Barium iodide (BaI₂) etc.
Properties of Iodine:
1. it is present in solid form.
2. it is crystalline in nature.
3. it is very corrosive and has pungent odor.
4. it can not react with oxygen and nitrogen.
PLEASE HELP!! :((((((((((((((((((((((((
Where is the word problems? Like the problems that you have to put it in.
Explanation:
23 POINTS PLEASE ANSWER
Question:
Amy was observing the growth of five kinds of flowering plants on a windowsill. She noticed that some of the flowers on some of the plants turned toward the sun during the day, but the flowers on other plants did not turn toward the sun. She asked the following question.
“Why do living things sometimes change direction?”
Why is Amy’s question not a very good scientific question?
Options:
It is too broad.
It is based on her opinion.
It depends on moral judgments.
It leads to a hypothesis that can be tested.
Answer:
it was too broad
Explanation:
mark me as the brainliest
ANSWER
it was too broad
For the change H2O2 --> H2O, is the oxygen oxidized, reduced, and/or neither?
Answer:
Reducing / reduced
A graduated cylinder is filled with 54.32 cm3 of water. An irregular solid made of iron is carefully placed into the graduated cylinder. The new volume recorded on the graduated cylinder is 57.65 cm3. The density of iron is known to be 7.874 g/cm³. What is the mass in grams of the irregular solid made of iron?
Answer:
The answer is 26.22 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density of iron = 7.874 g/cm³
volume = final volume of water - initial volume of water
volume = 57.65 - 54.32 = 3.33 mL
We have
mass = 7.874 × 3.33 = 26.22042
We have the final answer as
26.22 gHope this helps you
What does an atomic number represent in an atom?
A) number of electrons
B) number of protons
C) number of protons and neutrons
D) number of neutrons
Answer:
C, number of protons and neutrons
How many atoms are in 0.0745 mol K?
1. 27159200000000000000000
2. 37035300000000000000000
3. 35710500000000000000000
4. 45526300000000000000000
5. 13489300000000000000000
6. 40889400000000000000000
7. 44863900000000000000000
8. 23425600000000000000000
9. 42394900000000000000000
10. 25172000000000000000000
Answer:
44863900000000000000000
Which two formulas represent compounds?
A. Ag
B. HCI
C. H2
D. NaCl
Answer:
it is A and BExplanation:
A and b are Sodium chloride and Hydrogen chloride which are both compounds.
What is the correct chronological order of scientists contributing to the modern periodic table?
1. Lavoisier, Newlands, Moseley, Dobereiner, and Mendeleev
2. Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley
3. Moseley, Mendeleev, Newlands, Dobereiner, and Lavoisier
Answer:
the second one-Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley
Answer:
Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley
Explanation:
Edge 2021
What element is represented by this configuration: [Ar]452*
Be
Mg
Ca
Na
Answer:
its sulfur
Explanation:
that's what Google says
explain how are you able to drink liquid through a straw
Answer:
the suction pulls out the air in the straw and the liquid comes up with the suction.
Answer:
ya that is correct
Explanation:
9.Magnetization of iron is a physical change.
A true
B false
Answer:
This is true.
Explanation:
Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas.
This occurs when energy is added or removed
Answer:
melting
Explanation:
Answer:
physical change
Explanation:
i googled it and that's what came up sry if it's wrong (change of state came up too if that doesn't work)
Escribe la fórmula de los siguientes compuestos: Triyoduro de fosoro Carburo de silicio Tetracloruro de azufre Pentayoduro de nitrógeno Heptafluoruro de cloro Seleniuro de teluro (VI) Tribromouro de antimonio Nitruro de fósforo (III) Sulfuro arsénico
Answer:
hola, tuve que usar el traductor de google en esto. Ni siquiera sé si entenderás esto, pero vale la pena intentarlo. y la cuestión es que no tengo la respuesta a esto, pero tenía ganas de responder en español :) por favor, responda en español para que pueda responder con una respuesta en español porque ¡esto es divertido! Esta es la tercera respuesta en español que he hecho esta noche y no tengo la intención de detenerme ahora. Sin embargo, me estoy quedando sin cosas que decir. jaja
Explanation:
ANSWER FAST PLEASE
Maria’s class has learned how to drop an egg without breaking it. After 0.2 s, the kinetic energy of the falling egg is 0.5 J. If its mechanical energy is 2.3 J, what is its potential energy?
A. 1.2 J
B. 1.8 J
C. 2.8 J
D. 4.6 J
The Potential energy of the body is 11.8 Joules
The mechanical energy of the egg is given by the formula:
Mechanical energy = Potential energy + kinetic energy
Given the following parameters;
Mechanical energy = 2.3 JoulesKinetic energy = 0.5 JoulesFrom the formula:
Potential energy = ME = KE
Potential energy = 2.3 - 05
Potential energy = 1.8 Joues
Hence the potential energy of the body is 11.8 Joules
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