Answer:
(Ge)
Explanation:
I'm just taking a wild guess really!
Electrons have single negative charges. What does this mean?
what is irons number
Answer:
Iron's atomic number is 26
Explanation:
How do scientists classify matter
according to their physical and
chemical makeup ?
Answer:
Matter can be classified according to
physical and chemical properties. Matter is anything that occupies space and has mass. The three states of matter are solid, liquid, and gas. ... Pure substances can be either chemical compounds or elements.
Calculate the mass of the following:
9.11 mol He
Answer:
36.44 g of He
Explanation:
To convert from moles to grams, you simply multiply by the atomic mass. The conversion table looks like the following:
[tex]\frac{9.11 mol}{1}[/tex] * [tex]\frac{4.00 g}{1 mol}[/tex]
The mol units then cancel, and you are left with 36.44 g of Helium.
What mass of oxygen would be required for the complete combustion of 10 Grams of glucose?
Answer:
For the complete combustion of 10 g of glucose 11.52 g of oxygen is required.
Explanation:
Given data:
Mass of glucose = 10 g
Mass of oxygen required for complete combustion = ?
Solution:
Chemical equation:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Now we will convert the given mass of glucose into number of moles.
Number of moles = mass/ molar mass
Number of moles = 10 g/ 180.156 g/mol
Number of moles = 0.06 mol
Now we will compare the moles of glucose with oxygen.
C₆H₁₂O₆ : O₂
1 : 6
0.06 : 6×0.06 = 0.36 mol
Mass of oxygen required:
Mass = number of moles × molar mass
Number of moles = 0.36 mol × 32 g/mol
Number of moles = 11.52 g
For the complete combustion of 10 g of glucose 11.52 g of oxygen is required.
Why is creativity Important and construction scientific methods?
I
Explanation:
Sometimes it is necessary to put forth new theories to explain experimental results, Explanation:
Creativity is important to science because sometimes, it is necessary to put forth new theories to explain experimental results. Theories are explanation of scientific observations.
Answer: Without creativity, it would be difficult to come up with new methods to answer scientific questions, meaning we likely wouldn't learn anything new.
Explanation: took the quiz
A 30cm3 volume of water was placed in a cylinder, and a stone was dropped in. The water level rose by 35cm3. Is it true that the stone was 5cm3?
Answer:
The volume of stone is 5cm³.
Explanation:
Given data:
Volume of water = 30 cm³
Volume of water and stone = 35 cm³
Volume of stone was 5 cm³ = true or false
Solution:
To check weather the given volume of stone is true or not we have to calculate the volume of stone from given data.
Volume of stone = (volume of water + stone ) - volume of water
Now we will put the values.
Volume of stone = 35 cm³ - 30 cm³
Volume of stone = 5 cm³
Thus the given value is true. The volume of stone is 5cm³.
many reactive chemicals are stored in containers filled with Argon gas for safekeeping what about Argon's atomic structure makes it safe to store reactive chemicals in?
Answer:
Argon has 8 valence electrons making it non reactive.
Explanation:
Reactive chemicals are store in containers filled with Argon gas because the argon gas is non reactive. This is true because the argon gas has completely filled octet structure.
This can further be explained by writing the electronic configuration of argon.
The electronic configuration of argon is given below:
Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶
Valence electron => 3s²3p⁶ = 2 + 6 = 8
From the above illustration, we can see that the outermost shell (i.e 3s²3p⁶) is having 8 electrons indicating that it is completely filled as the maximum number of electrons any shell can accommodate outside the first shell is 8 electrons. Thus, argon has 8 valence electrons ( i.e electrons in the outermost shell) and hence it is non reactive as the outermost shell is completely filled.
how many valence electrons does hydrogen have
Answer:
one valence electron
Explanation:
Each hydrogen atom has one valence electron and is univalent.
The weather changed from cold to warm. Jessica was excited because should could wear her new flip flops and shorts to school. She had her science laboratory later in the day.
What should she do to be safe?
Which type of compounds are formed by ions that have opposite charges?
A. molecules
B. covalent
C. ionic
D. metallic
Answer:
c
Explanation:
if you need explanation, ask freely
A chemical reaction takes place to allow hand warmers to give off heat. This is an example of a(n) __________.
A. physical change
B. exothermic reaction
C. endothermic reaction
D. precipitate
Answer:
Exothermic
Explanation:
Exothermic reactions release heat, endothermic absorb heat, and precipitate is a solid formed from a solution
Answer:
B.
Explanation:
Gives off heat,.
Identify the group number of following oxides/hydrides in Mendeleev
periodic table:
i) R2O3 ii) R2O iii) RO2 iv) RH2 v) R2O7 vi) RH3
Answer:
See explanation
Explanation:
The oxides or hydrides are formed by exchange of valency between the two atoms involved. The group of the atom bonded to oxygen or hydrogen in the binary compound can be deduced by considering the subscript attached to the oxygen or hydrogen atom.
Now let us take the journey;
R2O3- refers to an oxide of a group 13 element, eg Al2O3
R2O - refers to an oxide of group a group 1 element e.gNa2O
RO2 - refers to an oxide of a group 14, 15 or 16 element such as CO2, NO2 or SO2
RH2 - refers to the hydride of a group 12 element Eg CaH2
R2O7 - refers to an oxide of a group 17 element E.g Cl2O7
RH3- refers to a hydride of a group 13 element E.g AlH3
What is conserved in physical changes?
shape
energy
mass
density
Answer:
The answer is C.
Explanation:
By the Law of conservation of mass, when a element, or product undergoes a physical change, mass always stays the same.
Hope you have a good day.
During physical change the mass of the material remains conserved. The correct option is C.
What is physical change?Even before to and after a physical change, the material implicated is unique architectural the same.
Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.
A physical change is simply a change in appearance. The situation has not changed since the change.
Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.
Mass is neither created nor destroyed in chemical or physical changes, according to the law of conservation of mass.
Physical changes occur when the phage of a substance changes without changing its chemical composition.
Thus, the correct option is C.
For more details regarding physical changes, visit:
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If an atom has 14 protons, 13 neutrons, and 14 electrons, what is it?
-silicon-14
-silicon-13
-silicon-27
-silicon-28
-none of these
Answer:
cilicon 14
Explanation:
A spectral line is read
to have a wavelength of 4700A. What is
this in meters?
Answer:
[tex]4.7 * 10^{-7} meters[/tex]
Explanation:
Angstrom can be defined as a metric unit of length for used for the measurement of the wavelength of light (optics) such as visible light, x-rays, ultraviolet light, gamma rays etc. The symbol for Angstrom is "A" and it is named after the 19th century physicist from Sweden, named Anders Jonas Angstrom.
Given the following data;
Wavelength of spectral line = 4700A
To convert this value to meters;
One Angstrom is mathematically equal to [tex] 10^{-10} meters [/tex]
[tex] 1 Angstrom = 10^{-10} meters[/tex]
[tex] 4700 Angstrom = X \; meters[/tex]
Cross multiplying, we have;
[tex] X = 4700 * 10^{-10}[/tex]
X = [tex]4.7 * 10^{-7} meters[/tex]
Therefore, 4700A is equal to 4.7e-7 or 0.00000047 meters.
The density of a pillow is greater than the density of a rock. Is this true of false
Answer:
I think it's false it helps you...... Thank you ☺️☺️Group/Family
Noble gases
Metals
Nonmetals
Halogens
Metalloids
Period
1.
A
2.
B
3.
C
4.
D
5.
E
6.
F
7.
G
Answer:
1. Metals
2. Metaloids
3. Non-Metals
4. Alkali Metals
5. Transition Metals
6. Halogens
7. Noble Gases
If the approximate density of 6.5 L of ethanol is 0.79 g/ mL, what is the mass in grams?
Answer:
The answer is 5135 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 = 0.79 g/mL
1 L = 1000 mL
6.5 L = 6500 mL
We have
mass = 0.79 × 6500
We have the final answer as
5135 gHope this helps you
I need help on this problem. I need it answered ASAP
Use this formula: Density = Mass/Volume
Given in the question:
Mass: 10g
Volume: 5cm3
The calculations:
Density = Mass/Volume
= 10/5
= 2g/[tex]cm^{3}[/tex]
Therefore, the density will be 2g/[tex]cm^{3}[/tex]
1. How is energy transferred within and between systems?
What was the most likely problem with the first set of
data?
O It was inadequate.
O It was false.
O It was recorded by one person.
O It was not recorded in a lab.
Answer:
it is A
Explanation:
PLEASE HELP ASAP!!!
P-3 has how many electrons?
-15
-12
-18
-none of these
Can someone please explain to me how I’m supposed to figure out the element with these configurations??
1. John travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Why?
Answer:
In Australia, it's warmer than most of the United States during winter.
Explanation:
When Liza was reading over the “Best of Blueberries” article, she quickly changed the claim in the article that read “1 cup of blueberries contains around 180 calories” because 1 cup of blueberries actually only contains about 80 calories. What does Liza MOST LIKELY do for a living?
researcher/fact checker
copy editor
commissioning editor
editorial expert
Answer:
your Answer is The first one, Its A, resercher/ fact checker
Explanation:
Pleaseee help meeeeeee
Answer:B
Explanation:
Heat boils it will get hot no heat/cold will freeze
In humans, the allele for curly hair and the allele for straight hair show incomplete dominance the offspring of a curly haired person and a straight haired person will have A) Curly hair B) straight hair C) wavy hair D) Curly and straight hair
Answer:
A
Explanation:
Curly Hair
What term describes the smallest unit that can perform all of the functions necessary for life
Answer:
Cell
A cell is the smallest unit of a living thing. Cells are the basic building blocks of all organisms
what other substances are considered pure substances
Explanation:
B and C they are the pure substances
Elements are considered as pure substances . Elements are mostly metals, non - metals and metalloids , so option C is right.
What are Elements ?An element is a substance that cannot be broken down by non - nuclear reaction. Elements considered as a pure substance . All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.
An element is a fundamental item that cannot be easily broken in smaller pieces. There are about 100 elements ,each with it's own types of atom. Everything in universe contain an atom of at least on or more than one elements.
Elements are pure substances ,hence option C is correct.
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