Answer:
hydrogen is a non-metal, and has one valence electron.
Explanation:
Hope this helps!!
Hydrogen shows properties of both metals and nonmetals. However, hydrogen is placed with the alkali metals since it contains one valence electrons.
What is hydrogen ?Hydrogen is the first element in the periodic table. It has only one electron and it is the valence electron of hydrogen. Therefore, hydrogen is placed in the first group of periodic table.
Hydrogen needs one more electrons to become stable. The 17th group elements halogens also have a valency of one. Hence, hydrogen shows some chemical similarities with halogens also.
Mostly hydrogen forms covalent bonds like non-metals and in rare cases, hydrogen forms ionic bonds by donating its electron. Therefore, hydrogen is mostly considered as a non-metal.
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A student has a sample of solid calcium. It is shiny and metallic looking. He squeezes a pipet of concentrated sulfuric acid onto the calcium. Bubbles are produced and the calcium appears to disappear. The test tube gets hot. What kind of change occurred?
Answer:
Physical change
Explanation:
There are two types of changes: physical change and chemical change. Physical change is defined as the change that changes the physical appearance of the substance and do not affcet the chemical composition of the substance whereas chemical change causes changes in the chemical composition of the susbstance.
The given example shows physical change because solid calcium undergoes sublimation. process in which a solid substance changes into gaseous phase directly without undergoing liquid phase.
Hence, the correct answer is "Physical change".
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.
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which option is an example of a physical change??
A breaking chemical bonds
B forming chemical bonds
C nuclear decay
D melting a substance
which option is an example of a chemical change
A ironing a shirt
B melting cheese
C grinding powder
D fireworks exploding
Answer:
D
Explanation:
Melting of ice is a physical change as there no new compound is forming only state is changing So Option D is correct option. For second question Option D is correct option as combustion reaction is taking place.
What is chemical change?Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature. Physical change is just opposite of chemical change. Phase change is an example of physical change.
Thus option D is correct option in both cases.
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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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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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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.
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
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.
Which situation aUggeata that an experlment han rellable renultn?
A. The experiment use8 a very uimple procedure
B. The experiment generates ldeau for new experimenta
C. The experiment can be repeated with the aame outcome.
D. The experiment aupports the hypothesls.
Answer:
Shiny like a limousine
You're spending like a cash machine
Smile, show your golden teeth
That's how you cover up your cavities
You're glowing like a diamond ring
I saw you bought some other things
You're spending like a cash machine
To cover up your insecurities
Don't front, no need ty67t6767
Explanation:
Help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Answer:
A
Explanation:
Answer:
A. Sorry if wrong, but if i'm right can you mark brailniest pls?
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.
Find the percent of oxygen in CaClO3)2 Show your work
PLZZ HELP!!
An atom has atomic number 11 and mass number 23. How many electrons does the atom have?
23
22
O 12
O 11
Answer:
12
Explanation:
23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.
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
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.
Why is Graphite soft
Answer:
Graphite is soft because it has weak inter molecular forces between its layers.
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:
i must be present in a compound for it considered organic
Answer:
Carbon
Explanation:
Organic compounds must contain carbon. They also usually contain hydrogen, oxygen, and often nitrogen and other compounds such as phosphorus.
Nearly all organic compounds contain carbon-hydrogen bonds.
Who was martin Luther king and how is he celebrite
Answer: martin luther king jr
Explanation: He led peaceful protests against the discrimination that the people of the United State did against African American men, women, and children. He was a celebrity due to his have "I a dream speech" that he said in front of the lincoln memorial. Plus he didn't approve of violence when trying to protest African American rights.
Answer:
Who is Martin Luther King and why is he famous?
Exsplanation
A Baptist pastor and civil rights activist, King worked to end legal segregation of blacks in the United States. He gave his famous “I Have a Dream” speech at the August 1963 March on Washington, and won the Nobel Peace Prize in 1964 at age 35 – the youngest man to have received the award.Apr 4, 2018
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:
The volume of an unknown liquid is shown in the graduated cylinder. The mass of the liquid is 105 grams.
What is the density of the unknown liquid?
A 3500 g/mL
B .33 g/mL
C 3.0 g/mL
D 3.3 g/mL
Answer:
the answer is c
Explanation:
BE FIRST TO ANSWER PLEASEEE ASAP! :D
Answer:
I want to say E or B
Explanation:
I am a beginner can someone give me a brainliest to start me out I would appreciate it.
:)
Answer:
Hi!
The best way you can receive a Brainliest is to help others. You shouldn't focus on receiving a brainliest, rather being glad you helped someone who needed it.
I hope you take this advice and answer a question! :)
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
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
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.
I hope this helps you! :)))))
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.
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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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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Identify arrows pointing to nonbonding electrons.
Answer:
C
Explanation:
Yessir