Answer: White blood cells help the immune system and help fight infection and disease.
Which of the following can be formed by physically combining pure substances? a. an element c. a compound b. a mixture d. all of the above
Answer:Which of the following can be formed by physically combining pure substances?a. an element c. a compound b. a mixture d. all of the above Weegy: It is true.The formula for Density is Mass divided Volume.
Explanation:
Answer:
It is B. a mixture
Explanation:
A is wrong because an element is part of a compound and can't be physically mixed, C is wrong because atm don't jin by just physically mixing then there must be a change in smething at the physical level
also correct on edg.
Chemists use letters of the alphabet as ____ for the elements.
Answer:
The symbol is the right answer.
Explanation:
The “ Symbol” is the correct answer because chemist uses the letters of the alphabet to denote the element. For instance, the element oxygen is denoted by the letter of the alphabet “O”, the hydrogen is denoted by the letter of alphabet “H”, Boron is denoted by the letter of alphabet “B”, etc. Here these are the examples that use one letter but there are other elements that use more than 1 letter as the symbol. For example, the Chlorine is represented by the Cl.
The letters of the alphabet are used by chemists as symbols in chemistry.
Symbols in chemistryThe “ Symbol” is the correct answer because the chemist uses the letters of the alphabet to denote the element. For instance, the element sulfur is denoted by the letter of the alphabet “S”, the hydrogen is denoted by the letter of the alphabet “H”. Other elements that use more than 1 letter as the symbol. For example, Chlorine is represented by the Cl.
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Solid aluminum hydroxide is added to a solution of potassium phosphite.
Give the following
Complete reaction
Complete ionic equation
Net ionic equation
Answer :
The complete balanced equation will be,[tex]Al(OH)_3(aq)+K_3PO_3(aq)\rightarrow AlPO_3(s)+3KOH(aq)[/tex]
The complete ionic equation in separated aqueous solution will be,[tex]Al^{3+}(aq)+3OH^{-}(aq)+3K^{+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)+2K^+(aq)+3OH^{-}(aq)[/tex]
The net ionic equation will be,[tex]Al^{3+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The complete balanced equation will be,
[tex]Al(OH)_3(aq)+K_3PO_3(aq)\rightarrow AlPO_3(s)+3KOH(aq)[/tex]
The complete ionic equation in separated aqueous solution will be,
[tex]Al^{3+}(aq)+3OH^{-}(aq)+3K^{+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)+2K^+(aq)+3OH^{-}(aq)[/tex]
In this equation, [tex]K^+\text{ and }OH^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]Al^{3+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)[/tex]
Un buzo que nada en las profundidades despide pequeñas burbujas de aire¿Aumenta disminuye o permanece igual el tamaño de las burbujas conforme suben a la superficie?
Answer:
Al ascender las burbujas van aumentando de tamaño.
Explanation:
Las burbujas que produce el buzo debajo del agua son pequeñas moléculas de dióxido de carbono gaseoso producto de la respiración del mismo.
Ahora, a medida que las burbujas suben a la superficie, la presión que sufren estas (Presión debido al agua), es menor conforme van ascendiendo debido a la ley de Boyle: A medida que la presión aumenta, el volumen va disminuyendo.
Esto significa que al ascender las burbujas van aumentando de tamaño debido a que la presión que sufren estas es menor que cuando están a mayores profundidades.
Hi! I need help on 1-4 ASAP! Thanks!
Answer:
5. a. false b. true c. false d. true e. false
6. it has to be something that can be supported or refuted through carefully crafted experimentation or observation
When 2891 is written in scientific notation, the exponent indicating the power of
10 is?
Answer:
For numbers less than 1, the power of 10 in scientific notation has negative exponent and for numbers greater than 1, the power is either zero or has positive exponent. Explanation of Solution The given number is 2891, to write the scientific notation, decimal should be placed after first non-zero digit.
Explanation:
______is used in production of hard disk. 1 platinum 2 silver 3 gold
Answer:
Platinum
Explanation:
Which parallel runs through Canada
Answer:
The 49th Parallel and the 60th Parallel are the most significant.
WILL GIVE BRAINLETS
What is one element a topographic map shows? A.Climate B.Landforms C.Space D.Weather
Answer:
B
Explanation:
landforms.....this is it
What is the speed of 550 meters per second in kilometers per second?
an atom has 23 protons, 25 neutrons and 23 electrons.
what is the element symbol
what is the atomic number
what is the mass number
Element symbol V
Atomic Number 23
Mass Number 50.9415
What is the atomic number?The atomic number is the number of protons in the nucleus of an atom.
Vanadium is a chemical element with the symbol V and atomic number 23. Classified as a transition metal, Vanadium is a solid at room temperature.
Hence,
Element symbol V
Atomic Number 23
Mass Number 50.9415
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Atoms of two different elements must have different electrical charges. numbers of neutrons. atomic numbers. energy levels.
Answer:
atomic numbers
Explanation:
Atoms are the unit of molecules and compounds or matter. They have their atomic numbers and mass. Atoms of different elements must have different atomic numbers. Thus, option C is correct.
What is an atomic number?An atomic number is the total number of protons in a nucleus that is an essential factor in determining the place and position of the atom in the periodic chart.
Though the nucleus is made of neutrons and protons, the atomic number is only defined by the number of protons alone. Hence, the number of protons is equivalent to the atomic number.
The number of the protons and neutrons together makes the atomic mass of the element that is expressed at the lower of the symbol, whereas the atomic number is written at the upper of the symbol.
Therefore, the atomic number is different in each atom.
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1. For each of the following numbers, by how many places must the decimal point be
moved to express the number in scientific notation?
II. For each number, will the exponent be positive, negative, or zero?
0.0000089911
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times How many kilometers do you swim?
Answer:
You would swim 200 time's.
Hope this help's :)
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times, and the kilometers that you swim are 200 kilometers.
What are meters and kilometers?Meters are kilometers are measurement units used to measure length. They are used to write the value of the measurements. There are seven basic units of measurement. The values are liters, kg, meters, grams, milliliters, etc.
Meter is a SI unit, it is denoted by small m, kilometers is unit of length which is denoted by km. The SI unit is the internation unit system of measurement.
One meter is equals to 1000 kilometers. An Olympic swimming pool is 50 meters long. A person swims 4 time of 50 kilometers.
So, 50 x 4 = 200 km.
Thus, the kilometers that you swim are 200 kilometers.
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Convert 1.4 x 10-4 cm to decimeters
Answer:
1.4 x 10^-5 dm
Explanation:
Centimeters (cm) and decimeters (dm) are interconvertible S.I units of length.
- A centimeter is one-hundredth of a meter i.e. 100cm = 1m
- A decimeter is one-tenth of a metre i.e. 10dm = 1m
Based on this, a centimeter is one-tenth of a decimeter i.e. 1dm = 10cm
Hence, to convert 1.4 x 10^-4 cm to dm, we divide the value by 10
= 1.4 x 10^-4 ÷ 10
= 0.00014 ÷ 10
= 0.000014
Convert back to scientific notation by counting the decimal point forward to have: 1.4 x 10^-5
Hence, 1.4 x 10^-4 cm is equivalent to 1.4 x 10^-5 dm.
How many significant figures are in this number?
9.678 grams
Answer:
4 significant figures
Reason
The reason is count from 9 and all the decimal. it would be different if there was 0.09768.
Plzzzzz help!!!!
Use complete sentences to differentiate between acids and bases on the basis of their behavior when dissolved in water. Give an example of each type.
Explanation:
Hey there!!
The differences between them are:
The acids are the substances which produces hydrogen ion dissolving in water. Eg: [tex]h2so4 = 2 {h}^{ + } + s {o4}^{ - - } [/tex]Base are the substances which produces hydroxyl ion while dissolving in water. Eg:[tex]naoh = {na}^{ + } {oh}^{ - } [/tex]Hope it helps....
0.056 g/s = ? g/min
What are the answers for this
Answer:
Solid:
shape: definite
volume:definite
closeness...: tightly packed
motion ..: vibrate in their position
liquid:
shape: indefinite
volume: definite
closeness: loosely packed
motion... : slide past each other
gas:
shape: indefinite
volume: indefinite
closeness: far apart
motion..: random movement
Explanation:
hope this helped you .. please mark as brainliest
what is the color of the sun? (wrong answers only!) haha [drop ur instagram so we can be friends! :)]
Answer:
I need points for my Ap Calculs class
Explanation:
bsbsjsjsjd
Answer:
pink ;)
Explanation:
the.alyssayork
As you move from left to right across a period, what happens to the atomic radil?
Answer:
Moving Across a Period
Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons
6 A student has a mass of 6.35 x 10^1 kg. What number below is the
equivalent to the student's mass? *
O A. 6.35 x 10^-2 g
B. 6.35 x 10^4 g
O C.635 g
O D. 215 lb.
Answer:
B. 6.35 x 10^4 g
Explanation:
Quantities such as mass have more than units that are interconvertible. Mass can be measured in kilograms (kg), grams (g), etc.
However, 1kg equals 1000grams
Hence, a measurement of 6.35 x 10^1 kg will be equivalent to grams (g) by multiplying by 1000units
That is, 6.35 × 10^1 × 1000
= 6.35 × 10^1 × 10^3
Multiplication in index means to add the powers
= 6.35 × 10^ (1+3)
= 6.35 × 10^4grams
Therefore, an equivalent measurement of 6.35×10^1 kg is 6.35×10^4 g.
Which of the following atoms has a full outer shell?
A. Ca
B. Li-1
C. Mg+2
D. N-2
Magnesium ( Mg+² ) has a full outer shell .
Reason:-K and L shells of an atom are full , then it will have a total of 2 + 8 = 10 electrons in it . We know that magnesium has 12 electrons in it . Magnesium having 2 free electrons.
Which of the following is a unit of volume in the metric system? (5 points)
Gallon
Liter
Pint
Quart
A litre is a unit of volume in the metric system. Hence, option B is correct.
What is volume?Volume – How much space an object or substance takes up.
Measured in cubic meters (m3), litres (L) & millilitres (mL).
Volume is the measure of the 3-dimensional space occupied by matter, or enclosed by a surface, measured in cubic units.
The SI unit of volume is the cubic meter (m3), which is a derived unit.
Volume is the measure of the capacity that an object holds.
For example, if a cup can hold 100 ml of water up to the brim, its volume is said to be 100 ml.
Volume can also be defined as the amount of space occupied by a 3-dimensional object.
Hence, option B is correct.
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What types of fertilizer will make grass grow greener?
Answer:
Milorganite 0636 Organic Nitrogen Fertilizer
Explanation:
According to gardenhelpful.com they list a few grass proudcuts to make your grass more green.
if an atom has two additional valence electrons than the original element has, what would be the charge of the atom
the pencil is material or mixture ?please help
Answer:
mixture
Explanation:
How does carbon dioxide gas in the atmosphere cause climate change?
Gravitational attraction exists between all objects in the universe. Which word, if any, should replace "all" in this statement to make the statement true.
Answer:
any two
Explanation:
Gravitation force or gravitational attraction is a force of pulling or attraction that exist between any two bodies that have a mass. Each and every body attract each other with the force of gravity due to their masses.
Every object in this universe having mass and distance attracts every other object.
Tokyo, Japan is 8817.6 km from California. how many millimeters is this? answer in scientific notation.
Answer:
[tex]d=8.817\times 10^9\ mm[/tex]
Explanation:
It is given that,
Japan is 8817.6 km from California. We need to convert this distance in millimeters.
We know the conversion from km to mm is as follows :
1 km = 1000000
To convert mm km to mm use the unitary method as follows :
8817.6 km = 8817.6 × 1000000
[tex]d=8.817\times 10^9\ mm[/tex]
Hence, the distance between Japan and California [tex]8.817\times 10^9\ mm[/tex].