i need help and it’s for science cause i have a bad grade in it and have 3 days to get all my grades up so help pls?
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Related Questions
Now look closely at the patterns in the table. Compare the elements in each column and row. What can we say about
elements in the same group and elements in the same period of the periodic table?
Select all the correct answers.
The number of electrons in the second energy level increases by one down each column.
Elements in the same row have the same number of occupied energy levels.
For each column, the last occupied energy level has the same number of electrons.
The number of electrons in the first energy level increases by one from Li to Ne.
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Answer: Elements in the same row have the same number of occupied energy levels. For each column, the last occupied energy level has the same number of electrons.
Explanation: Straight from PLATO.
On comparing the elements we can say that:
B. Elements in the same row have the same number of occupied energy levels.
Elements in periodic table:
In the periodic table, elements are arranged in an order of increasing atomic number. It comprises of seven periods and eighteen groups.
The elements present in the same row or in the same period will have equal number of energy levels or shells.
Thus, option B is correct.
Find more information about periodic table here:
brainly.com/question/15987580
how many significant figures are in the number 3×10⁶
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Answer:
1 significant figure
Explanation:
3×10^6 is 3,000,000
Non-zero digits are always significantAny zeros between two significant digits are significantA final zero or trailing zeros in the decimal portion ONLY are significantExample: .500 or .632000 the zeros are significant
.006 or .000968 the zeros are NOT significant
PLEASE explain your answer!!!!
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Answer:
Explanation: confusing
Which of the following is a chemical property of a sheet of paper?
A. The paper can be burned.
B. The paper can be crumbled.
C. The paper does not attract a magnet.
D. The paper does not conduct electricity.
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Answer:
A
Explanation:
Flammability is a chemical property. The paper crumbling would be a physical property. The inability to attract a magnet or conduct electricity would be considered electrical properties
Explain the difference between terms "bonded" and "attracted'
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bonded means that the two have come together and are attached together, wheras attracted means that the two like to come close to each other but are not put together
what is homogeneous mixture?
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A mixture is a portion of matter made up of two or more substances called constituents. Mixtures are the product of the mechanical joining of substances without change in chemical nature, and therefore, each constituent retains its properties.
the option 4
what element has 3 valence electrons in the 3rd energy level
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Answer:
Aluminum (Al)
Explanation:
It has 3 electron orbitals and has 3 valence electrons
please helppp!!!
Consider the following intermediate chemical equations.
C(s) +202(g) → CO(g)
CO(g)+302(g) → CO2(g)
How will oxygen appear in the final chemical equation?
O O2(g) as a product
O O2(g) as a reactant
O O(g) as a product
O 20(g) as a reactant
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O₂(g) as a reactant
Further explanationIn chemical reactions, there is a reaction between reagents and products
Reaction:
aA + bB ⇒ cC
Substances A and B are called a reactants
Substance C is called a product
In the above reaction:
Reactants: C, O₂ and CO Products: CO and CO₂CO functions as a product in the first reaction and functions as a reactant in the second reaction
In the final chemical equation :
CO(g)+30₂(g) → CO₂(g)
O₂ is on the left so it is called the reactant
Answer: B. O₂(g) as a reactant
Convert the following to Kelvin
12) 0° C
13) -50° C
14) 90° C
15) -20° C
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Answer:
12)273.15 kelvin
13)223.15 kelvin
14)363.15 kelvin
15)253.15 kelvin
Explanation:
thank u!!!
Answer:
12) 273.15
13) 223.15
14) 363.15
15) 253.15
Explanation:
Formula:
_C+273.15=_K
I WILL GIVE U BRAINLIEST
Answers
Answer: YEAH ITS the third one
Explanation: duhh
does anyone have any information about "trititanium pentoxide" or "titanium oxide"?
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Answer:
Commonly available heat-storage materials cannot usually store the energy for a prolonged period. If a solid material could conserve the accumulated thermal energy, then its heat-storage application potential is considerably widened. Here we report a phase transition material that can conserve the latent heat energy in a wide temperature range, T<530 K and release the heat energy on the application of pressure. This material is stripe-type lambda-trititanium pentoxide, λ-Ti3O5, which exhibits a solid–solid phase transition to beta-trititanium pentoxide, β-Ti3O5. The pressure for conversion is extremely small, only 600 bar (60 MPa) at ambient temperature, and the accumulated heat energy is surprisingly large (230 kJ L−1). Conversely, the pressure-produced beta-trititanium pentoxide transforms to lambda-trititanium pentoxide by heat, light or electric current. That is, the present system exhibits pressure-and-heat, pressure-and-light and pressure-and-current reversible phase transitions. The material may be useful for heat storage, as well as in sensor and switching memory device applications.
Explanation:
What form of energy is stored once glucose is from
o A. light energy
O B. kinetic energy
O C. chemical energy
O D. mechanical energy
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Answer:
The form of energychemical energy
Which of the following is a natural source of electricity?
A deep mines
B ligthening
C coal
D car batteries
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Answer:
c
Explanation:
by burning it we get steam from.it electricity ..........
Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K
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16) 100- 273= -173°celsius
17) -73°Celsius
18) °Celsius
19) 77°Celsius
16) 100°K= 100K − 273.15 = -173.1°C
17) 200°K= 200K − 273.15 = -73.15°C
18) 273°K= 273K − 273.15 = -0.15°C
19) 350°K= 350K − 273.15 = 76.85°C
Hope this helps :)
What is often added to the water used when reacting the group 1 metals with
water?
Universal indicator
An acid
An alkali
Oil
What is produced when sodium reacts with water?
Sodium oxide and water
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Answer:
an acid.
sodium oxide and water
BRAINLIEST
What type of bond is Cu and F Ionic or Covalent?
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moles in 9.01x10^23 molecules water
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Answer:
The answer is 1.50 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{9.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{9.01}{6.02} \\ = 1.496677740...[/tex]
We have the final answer as
1.50 molesHope this helps you
Answer: 1.50 moles
Explanation:
If its density is 34 g/ml, what is the mass of 120.0 ml of the liquid?
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Answer:
The answer is 4080 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 = 120 mL
density = 34 g/ml
We have
mass = 34 × 120
We have the final answer as
4080 gHope this helps you
what are the 3 subatomic particles of the atom? What are their corresponding charges and locations within the atom?
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Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom.
Explanation:
the negatively charged electrons can be found around the nucleus in an electron cloud.
2 Examples of solid, liquid and gas
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Answer:
Solid
1. Stone
2. Brick
Liquid
1. Water
2. Oil
Gas
1. Oxygen
2. Nitrogen
Answer:
rock and sand, water and steam, smoke and hydrogen
Explanation:
rock and sand are solids, water and steam are liquids, smoke and hydrogen are gases. trust me i know this
Which timeline best shows the history of the development of cell theory? 1665 1838 Schleiden 1855 Hooke VirchowN 1600 1700 1676 1800 1900 1839 Schwann Leeuwenhoek 1665 Hooke 1838 1855 Schleiden Virchow 1700 1800 1900 1676 Leeuwenhoek 1830 Schwann 1665 1838 1855 Hooke Leeuwenhoek]Virchow O 1600 1700 1676 1900 1839 Schwann Schleiden 1665 1838 1855 O Virchow Schwann Hooke 1700 1800 1676 1839 1900 Leeuwenhoek Schleiden.
Answers
Answer:
Schleiden, Schwann, and Virchow
Explanation:
A component of the cell theory is that all living things are composed of one or more cells.
A component of the cell theory is that the cell is the basic unit of life.
A component of the cell theory is that all new cells arise from existing cells.
Answer:
B is right edg 2021
Explanation:
what type of ions are the atoms Mg and Na expected to be? why?
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Answer:
its C
Explanation:
just took the quiz
Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of –7.2°C. Bromine can be classified as a
compound.
impure substance.
mixture.
pure substance.
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Answer:
D. pure substance.
Explanation:
Answer:
:D
Explanation:
Which statement explains why some elements decay and others do not?
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Answer:
C) Elements that decay have a proton to neutron ratio that is too high or too low.
Explanation:
e2021
Why is hydrogen peroxide sold in opaque plastic bottles?
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it's not a very stable compound
11) Identify the number of elements and the number of atoms present in the chemical formula. NaHCO ²
4; 6
5; 6
4,5
3; 5
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Answer:
4;6
Explanation:
because there are four elements
i need help Which of the following shows the correct order in which organs take part in the process of digestion
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Answer:
Mouth
Esophagus
Stomach
The small intestine
Colon (large intestine)
Rectum
The distinctive odor of vinegar is due to acetic acid, HC₂H₃O₂, which reacts with sodium hydroxide. If a 3.45 mL sample of vinegar needs 42.5 mL of 0.115 M NaOH to be neutralized, how many grams of acetic acid are in a 1.00 L bottle of this vinegar?
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Answer:
Explanation:
CH₃COOH + NaOH = CH₃COONa + H₂O .
42.5 mL of .115 M of NaOH will contain .0425 x .115 moles of NaOH
= 48.875 x 10⁻⁴ moles NaOH
It will react with same number of moles of acetic acid
So number of moles of acetic acid in 3.45 mL = 48.875 x 10⁻⁴
number of moles of acetic acid in 1000 mL = 48.875 x 10⁻⁴ x 10³ / 3.45 moles
= 1.4167 moles
= 1.4167 x 60 gram
= 85 grams .
So 85 grams of acetic acid will be contained in one litre of acetic acid.
Help fast!
Determine the density of a liquid if it’s mass is 50.5 grams.
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Answer:
do we have the volume ?
Explanation:
Which element would be the least similar to magnesium
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Answer:
Chemistry Q&A Library decide which element probably forms a compound with chlorine that has a chemical formula most and least similar to the chemical formula of the compound formed by chlorine and magnesium most and least similar to magnesium:strontium,rubidium,phosphorus, cesium
Explanation:
hope this helped ❤✨