Answer:
Sodium (Na)
Explanation:
The element on the periodic table at Column (group) 1, period 3 is Sodium (Na)
13. Which are the simplest pure substances that cannot be broken down into any other substances?
Answer:
Elements
Explanation:
Each kind of atom is an element. Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
Answer:
Elements
Explanation:
Elements such as those on the periodic table are unable to be broken down into simpler forms.
Mixtures (both homogenous and heterogenous) are made of multiple elements making it able to be physically broken down back to its original elements.
Compounds are also made up of multiple elements, however it must go through a chemical separation process in order for it to be broken down into its original elements.
Matter is a broad term of any substance. So it could both be a combination or a single element making it incorrect for this question.
What are three factors homeowners should consider when choosing the site for a new house?
Answer:
location
topography (quality)
other facilities close by e.g gas station (it is not advisable to live close to a gas station, incase of explosion)
Answer:
school district, daily commute, neighborhood character, property value, nearby amenities
A liquid is cooled during an investigation causing it to solidify. Which of the following most likely occurred?
Answer:
This question lacks options, the options are;
A. Absorption of heat
B. A chemical change
C. A physical change
D. Formation of a new compound
The answer is C. A physical change
Explanation:
A physical change is a type of change that does not involve the chemical composition of the substance(s) involved. Physical changes affect the form but not the chemical content of a substance. Examples of physical changes are freezing, change of state, boiling etc.
In this question, a liquid is cooled during an investigation causing it to solidify. The cooling of this liquid represents a PHYSICAL CHANGE because the liquid state of the substance is only changed to a solid state but does not involve changing the chemical composition of the substance.
A liquid is cooled during an investigation physical change causing it to solidify.
What is physical change?Physical change occurs whenever there is difference in the appearance of any object observed.
In the question it is given that during an investigation a liquid is cooled down which results in the solidification of that liquid. During that change state of material changes from liquid state to the solid state, which is an example of a physical change.
Hence, in the question physical change occurs.
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Match each electron configuration to the correct element. Use the periodic table to determine the number of electrons that each element has. Drag the tiles to the correct boxes to complete the pairs.
Answer:
Explanation:
Edmentum
The arrangement of electrons within an atom's orbitals is known as its electronic configuration. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.
The distribution of an element's atoms' electrons throughout several atomic orbitals is symbolically represented by the electronic configuration of that element.
A standardized nomenclature is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript.
The correct matches are:
Zn: [Ar] 3d¹⁰ 4s²
Fe: [Ar] 3d⁶ 4s²
Sn: [Kr] 4d¹⁰5s²5p²
Cl: [Ne] 3s² 3p⁵
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given the following balanced chemical equation:
2KHCO3→K2CO3+ CO2+ H2OA.
What are the conversion factors between moles of KHCO3and moles of K2CO3?
Answer:
2 to 1
Explanation:
The reaction equation is given as:
2KHCO₃ → K₂CO₃ + CO₂ + H₂O
The conversion factor between the moles of KHCO₃ and K₂CO₃ is 2 to 1.
From the balanced chemical equation, we find out that;
2 moles of 2KHCO₃ will produce 1 mole of K₂CO₃.
So given any mole of either of the reactant or product, we can find the unknown.
Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to .
Answer:
The indroduction of lizards in this marshy habitat may lead to severe alterations of its own ecosystem. Since the lizards and frogs are both species who feed on small insects, the insect population might begin to decrease around the area. Furthermore, if insects have lessened in the marsh, that means food for the lizard as well as for the frog. In an extreme scenario, unless the two species adapt to these new conditions, their population may rapidly decrease.
Answer:
Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a commensal-host relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to competition between lizards and frogs for food .
The change of state from a gas to a liquid. *
O evaporation
O condensation
O sublimation
O deposition
Answer:
A, Condensation
Explanation:
I got it correct :)
Which two rocks contain the mineral quartz?
1.
gabbro and schist
2.
dunite and sandstone
3.
granite and gneiss
4.
pumice and scoria
Answer:
3. Granite and Gneiss.
Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism. Banded gneisses called migmatites are composed of alternating light colored layers of granite or quartz feldspar and dark layers rich in biotite.
Granite is a purely natural stone that comes directly from stone quarries and is then cut into thin slabs, polished, and fabricated into countertops. So-called quartz countertops are engineered stone products that may contain a large percentage of natural quartz but may also include other minerals.
Pls help I’m stuck on this part
Answer:
As you begin your trip down the hill you increase your speed resulting in a transformation from potential energy to kinetic energy.
Explanation:
At the top of the mountain, you have potential energy. But as you start moving down the mountain, your speed increases and have a lot of kinetic energy.
What is the shortest bond type?
Select the correct answer
Because of its size, adult blue whale has few natural predators. It’s diet consists exclusively of tiny creatures called krill. These whales can dive to great depths but must come to the surface regularly for air. From this information, what is one limiting factor for population of blue whales?
A. Availability of krill
B. Available sunlight for photosynthesis
C. Oxygen in water
D. Salinity of water
E. Visibility in water
Answer:
A
Explanation:
The correct answer would be the availability of krill.
A limiting factor is a substance or condition whose presence/absence can prevent a population from reaching its potential. Limiting factors can be biotic (living) or abiotic (non-living). Biotic factor includes the presence of competitive organisms in a population while abiotic factor includes food.
In the case of the blue whale, its diet is krill. Hence, its survival is largely dependent on the availability of krill. Otherwise, the blue whale might starve. Therefore, the availability of krill is a limiting factor for the population of whales.
The correct option is A.
How can you tell which elements form chemical bonds?
Answer: The number of bonds that an element can form is determined by the number of electrons in its valence shell. Similarly, the number of electrons in the valence shell also determines ion formation.
Explanation:
The gradual temperature change from one season to the next is due to what? view attachment
Answer:
The greenhouse effect
Explanation:
The greenhouse effect is a straightforward method that heats the Earth's exterior. When the Sun's rays touch the Earth's environment, some of it is bounced back to space and the rest is grasped and re-heated by greenhouse gases. The consumed energy heats the environment and the exterior of the Earth.
What is the specific heat of a metal if the temperature of a 12.5 g sample increases
from 19.5C to 33.6C when it absorbs 37.7J of heat?
Answer:0.213 J/g°C
Explanation:
To calculate specific heat of the metal, the formula is used:
Q = m × c × ∆T
Where Q = amount of heat
m = mass
c = specific heat
∆T = change in temperature
Explanation:
Which of these statement describe a chemical property
The table lists properties of some elements. Which element would you
expect to be in group 18 of the periodic table?*
2 points
Element
Electrons in a
Neutral Atom
Electrons in
Outer Energy Level
4
Carbon
6
8
6
Oxygen
Neon
10
8
Sodium
11
1
Chlorine
17
7
carbon
neon
chlorine
O sodium
Answer:
the 18 columns are labeled “Group” Figure 2. Elements in the periodic table are ... differ dramatically in their chemical and physical properties, but some elements are ... The groups can also be referred to by the first element of the group.
Explanation:
Which of the following quantum numbers describes a d-orbital in the fourth energy level?
a. n = 4, l = 0, m = 0
b. n = 3, l = 1, m = 0
c. n = 3, l = -1, m = 0
d. n = 4, l = 2, m = 0
Answer:
d. n = 4, l = 2, m = 0
Explanation:
A d-orbital in the fourth energy level can only be represented by n = 4, l = 2, m = 0.
n is the principal quantum number(n) which signifies the energy level, here it is 4;
l is the azimuthal quantum number or l which signifies the shape of the subshell, it takes a value of n - 1, 0,1,2 or 3
m is the magnetic quantum number(m) which can be -2, -1, 0, 1 , 2
So, the right and fitting solution is n = 4, l = 2, m = 0
proper regulation of the cell cycle provides which of the following benefits to multicellular organisms. select all of the correct answers.
~repair and renew wounds effectively
~replacing lost cells,such as a shed skin cell
~allows for growth
~allows for reproduction
Answer: repair and renew wounds effectively
~replacing lost cells, such as a shed skin cell
~allows for growth
~allows for reproduction
Explanation:
The cell cycle includes the various events in which a cell matures by increasing length and shape, cell replicates its genome and prepare itself for cell division.
The cells divide and replace the old and damaged cells in the multicellular organisms. Multicellular organisms are those organisms which have more than one cell.
This also helps in replacing the lost cells and helps in removing the shedding the skin cell.
This process is also useful for cellular growth and reproduction.
Remember to balance the equations first
1. Calculate the number of moles for each product produced (carbon dioxide, nitrogen,
oxygen and water) from the detonation of 3.2 mol of nitroglycerin by the reaction.
C,H,O,N, → CO, + N2 + O2 + H2O
mol CO₂ = 9.6
mol N₂ = 4.8
mol O₂ = 0.8
mol H₂O = 8
Further explanationReaction
4C₃H₅O₉N₃ → 12CO₂ + 6N₂ + O₂ + 10H₂O
mol CO₂
[tex]\tt \dfrac{12}{4}\times 3.2=9.6[/tex]
mol N₂
[tex]\tt \dfrac{6}{4}\times 3.2=4.8[/tex]
mol O₂
[tex]\tt \dfrac{1}{4}\times 3.2=0.8[/tex]
mol H₂O
[tex]\tt \dfrac{10}{4}\times 3.2=8[/tex]
Position always is relative to another object or location
options: True False
Answer:
True
Explanation:because of the motion
If an element has no electrons to share and is stable, what family is it found in?
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. If an element with no electrons to share belongs to noble gas family.
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Noble gas is the group 18 elements whose octet is complete and they are not ready to give or take electrons from other element. They are very much stable on its own.
Therefore if an element has no electrons to share and is stable then that element belongs to group 18 or noble gas family.
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HELP PLEASE!!!
HCl is _____.
a base
a neutral
an acid
Answer:
an acid
Explanation:
Hydrochloric acid or muriatic acid is a colorless inorganic chemical system with the formula HCl. Hydrochloric acid has a distinctive pungent smell. It is classified as strongly acidic and can attack the skin over a wide composition range, since the hydrogen chloride completely dissociates in an aqueous solution. Wikipedia
Which choice describes the forms that energy takes when it starts in the Sun and ends in the sugars of plants? A. chemical potential energy light energy nuclear energy B. nuclear energy light energy chemical potential energy C. nuclear energy chemical potential energy light energy D. light energy nuclear energy chemical potential energy
Answer:
D. light energy nuclear energy chemical potential energy
Explanation:
Energy transformation that takes place in plants when they change sun solar energy into plant glucose, is :
Light energy (by sunlight) to nuclear energy , chemical potential energy (glucon energy in plant cell - used by plants to make food).
Where are the different
particles in an atom located and what are their charges?
Explanation:
The different subatomic particles in an atom are the:
Protons which are the positively charged particles. Electrons which are the negatively charged particles. Neutrons which do not carry any charges.Protons and neutrons are located in the nucleus of an atom which is the tiny center of the atom.
Electrons orbits around the nucleus and fill the rest of the volume of atom.
what organisms do pteropods eat
nutrient enriched plankton i believe! :)
Can someone explain how my teacher got that result in acceleration
Throughout the reflection, make sure you have a copy of the Student Guide and your data table. Choose the terms that complete the statements.
In this lab, you determined the combination of humidity, air temperature, and air pressure that create weather patterns.
is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold.
is a measure of how hot or cold the air is, and
is the force exerted per unit area by the particles in the air. These
conditions influence weather patterns.
Answer:
A. relative humidity B. air temperature C. air pressure D. atmospheric
Explanation:
The sentences can be completed as follows; Humidity is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. Air temperature is a measure of how hot or cold the air is, Air pressure is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.
What is humidity ?Humidity refers to the amount of water vapor or moisture present in the air. Specifically, it is the measure of the amount of water vapor present in the air compared to the amount of water vapor the air can actually hold at a particular temperature and pressure.
It is often expressed as a percentage, known as relative humidity, which describes the amount of moisture in the air relative to the maximum amount it can hold at a given temperature.
The given sentences can be completed as :
Humidity is the amount of water vapor in the air compared to the amount of water vapor the air can actually hold. Air temperature is a measure of how hot or cold the air is, Air pressure is the force exerted per unit area by the particles in the air. These conditions influence weather patterns.
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Who and when found Neutron?
How are atoms combined in a mixture?
Answer:
Chemically combined and cannot be separated
Explanation:
1)A minimum of two atoms combine to form a molecule.
2)Atoms are combined via chemical reactions thus chemically combined. Sodium+Chlorine
e.g Na+Cl—>NaCl²
a simple definition of cells
Answer:
Cells are the basic structural and functional unit of life.