2. Magnesium is an alkaline earth metal. With which group of elements is magnesium most reactive?
F. nonmetals
G. noble gases
H. alkali metals
J. transition metals
Answer:
alkali metals
Explanation:
alkali metals
The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements.
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11. The respiration rate of a goldfish is
measured. The goldfish is then placed in
cold water and the respiration rate is
measured again.
Answer:
the respiration rate is the independent varaible ,measured is the indpendent variable i think
Explanation:
round 0.000789 to 2 significant figures
Answer:
0.00079
Explanation:
Any zero after the decimal isn’t a significant figure
How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O)? For example if the sample size was 10 L or 10,000 L.
Given :
Mass of oxygen containing carbon monoxide (CO) is 2.666 gram .
To Find :
How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O) .
Solution :
By law of constant composition , a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.
So , volume of solution does not matter .
Moles of oxygen , [tex]n=\dfrac{2.666}{16}=0.167\ mole[/tex] .
Now , molecule of CO contains 1 mole of C .
So , moles of C is also 0.167 mole .
Mass of carbon , [tex]m=12\times 0.167=2\ g[/tex] .
Therefore , mass of carbon is 2 grams .
Hence , this is the required solution .
Material of density of 762 kg/m3 occupies a container
volume of 99 cm3. What is its mass?
Hint: density = mass/volume
Answer:
The answer is
0.075 kgExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 762 kg/m³
We must first convert the volume from cm³ to m³
[tex]1 \: {cm}^{3} = 1 \times {10}^{ - 6} {m}^{3} [/tex]
So 99 cm³ will be
[tex]9.9 \times {10 }^{ - 5} \: \: {m}^{3} [/tex]
So the mass of the material is
[tex]mass = 762 \times 9.9 \times {10}^{ - 5} \\ = 0.075438[/tex]
We have the final answer as
0.075 kgHope this helps you
Answer:
75438 kg
Explanation:
1.) How do plants get their energy?
Answer:
Sun, water, caron dioxide.
Explanation:
They get there energy from those because photosynthesis the sun gives them that energy but the sun goes with water too because the sun and the water help it eat and produce its food and then the carbon is for it to breathe and thats how we have oxygen because the plants take in carbon and then they give out oxygen so thats why we need plants and plants need us.
Can i be brainliest.
Vanadium has an atomic mass of 50.9415 amu. It has two common isotopes. One isotope has a mass of 50.9440 amu and a relative abundance of 99.75 %. a) What is the abundance of the other isotope? b) What is the mass of the other isotope?
Answer:
this does not look like chemistry but I believe your answer is 50.9439
Explanation:
hope it helps
which heat source would keep the pizza the warmest.
Answer:
a lot of heat source
Explanation:
Which of the following substances is used up during photosynthesis?
What is 9872002 in scientific notation?
Answer:
= 9.872002 × 10^6
Explanation:
Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. The resulting decimal number is a.
Count how many places you moved the decimal point. This number is b.
If you moved the decimal to the left b is positive.
If you moved the decimal to the right b is negative.
If you did not need to move the decimal b = 0.
Write your scientific notation number as a x 10^b and read it as "a times 10 to the power of b."
Remove trailing 0's only if they were originally to the left of the decimal point.
is Gatorade a compound or an element
Answer:
Element...follow me and mark me brainliest
Answer:
A compound because it cannot be found on the periodic table
Explanation:
a 20.0g sample of an element contains 2.16x10^23 atoms identify the element
Answer:
yes
Explanation:
A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to
To solve this we must be knowing each and every concept related to experiment. Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.
What is experiment?Any procedure where measurements are taken and tests are run to support or disprove a hypothesis is referred to as a scientific experiment.
A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to leave the room and go to an area with fresh air.
Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.
To learn more about experiment, here:
https://brainly.com/question/11205647
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How is this model useful?
O It shows how electrons are distributed in the shells of an iron atom.
O It shows how electrons are distributed in the shells of a cobalt atom.
o It shows how orbitals are distributed in the shells of an iron atom.
It shows how orbitals are distributed in the shells of a cobalt atom.
Answer:
A) It shows how electrons are distributed in the Shells of an Iron atom.
Explanation: Took the test on Edge
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The given model shows how electrons are distributed in the shells of an iron atom.
Therefore, the correct option is option A.
To know more about atom, here:
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Identify by element's full name.
Answer:
1.a member of carbon family with 14 eletrons is silicon
2.halide which is liquid at room temperature is bromine
3.transition metal with 79 electrons/protons and neutron 80 for me Is Gold
A coyote and an oak tree both have DNA?
Answer:
true, they both have different types of DNA.
Answer:
Um yes... they have different DNA's.. ;-;
Explanation:
20. Convert: 7.7 mm
km.
a. 7.7 x 10-6
b.7.7 x 10-3
c. 7.7 x 103
d. 7.7 x 106
e. 7.7 x 102
Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
20
20
А
B
С
9
D
E
19
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
Answer:
A = 8
B = 8
C = O ( Oxygen )
D = 26
E = 30
F = Fe (Iron)
Explanation:
1)To get "A" we use the following formula
mass number = number of protons + number of. neutrons
15 = number of protons + 7
15 - 7 = number of protons
8 = number of protons
A = 8
2)To find "B"
atomic number = number of protons
Atomic number = 8
B = 8
3)To find "C"
the atomic number is 8 so the element which
has 8 atomic number on periodic table is Oxygen.
C = oxygen
4) To get "D"
Number of protons = atomic number
number of protons = 26
D = 26
5)To get "E"
mass number = number of protons + number of. neutrons
56 = 26 + number of neutrons
56 - 26 = number of neutrons
number of neutrons = 30
E = 30
6) To find "F"
The atomic number is 26 so the element which has 26 atomic number on periodic table is Iron.
hope it helps
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If there are three naturally occurring isotopes of the hypothetical element R. The R-64 isotope has a 48.89% abundance and mass of 63.929 amu. The R-65 isotope has a 27.81% abundance and mass of 65.996 amu. The R-67 isotope has a 23.30% abundance and mass of 67.002 amu. Calculate the average atomic mass of the hypothetical element R.
Answer:
65.21g
Explanation:
[tex](48.89 \div 100) \times 63.929 = 31.25 \\ (27.81 \div 100) \times 65.996 = 18.35 \\ (23.3 \div 100) \times 67.002 = 15.61 \\ 31.25 + 18.35 + 15.61 = 65.21[/tex]
The substances are placed in separate containers at room temperature, and each container is gradually cooled. Which of these substances will solidify before the temperature reaches 0°C?
Answer:
Benzene
Explanation:
it's freezing point is 5.5 C which is greater than 0 C
1. 30 kg =___g
Idk how to do this pls help
Answer:
30000
Explanation:
all you have to do is multiply by 1000
use the law of conservation of mass to complete this reaction. Na+Cl2
Answer:
sulfur, selenium, and oxygen.
Explanation:
I got it right on my test
3. The dry air in the Alps helped to prevent damage to the cells in the Iceman's body.
(1 Point)
true
false
is this true or false ?
Answer:
False
Explanation:
because they do not prevent damage they make damage
A 5.32 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.12 g fluorine, what is the mass of the KF in the mixture? mass of KF = _______ g Please only answer if you're going to answer seriously
Answer:
The mass of KF in the mixture is 2.77 gms.
Explanation:
Given;
Total weight of mixture (LiF+KF)=5.32gms
Let, mass of KF in the mixture = x gms
⟹ mass of LiF in mixture =(5.32-x)gms.
We know that :
Atomic weight of F=19gms.
Atomic weight of Li =7gms.
Atomic weight of K = 39 gms.
moles=mass/(molecular weight)
Thus, moles of KF=x/58
and moles of LiF = (5.97-x)/26LiF=(5.97−x)/26
Thus,
moles of F in KF=moles of KF=x/58 ---(1)
moles of F in LiF =moles of LiF= (5.32-x)/26---(2)
From (1) & (2),
Total moles of Fluorine
=(x/58)+((5.32-x)/26)
Hence,
total weight of Fluorine in sample = moles*Atomic weight
=((x/58)+((5.32-x)/26))*19gms.
=3.12 gms.---(given)
Now, solving the equation for x,
26x +(5.32*58)-58x
=3.12*58*26/19
22x=308.56-247.62
x=60.94/22
=2.77 gms. (Answer)
Thus, the mass of KF in the mixture is 2.77 gms.
Brainliest! Please help me out with this table!! :(
In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products? A.Zn + 2HCl → H2 + ZnCl2 B.Li2CO3 → LiO + CO2 C. CO2 + H2O → CH2OH + O2 D. CH4 + O2 → CO2 + 2H2O
Answer:
A.
Explanation:
The chemical equation in which the number of atoms in the reactants is the same as that of products would be Zn + 2HCl → H2 + ZnCl2. The correct option would be A.
Let us consider all the component atoms in the equation: Zn + 2HCl → H2 + ZnCl2
Zn: 1 atom in the reactant side and 1 atom in product sideH: 2 atoms in reactant side and 2 in product sideCl2: 2 atoms in reactant side and 2 in product side.In Li2CO3 → LiO + CO2:
2 atoms of Li are in reactant side and only 1 in product sideIn CO2 + H2O → CH2OH + O2
2 atoms of H are in reactant side while 3 are in product sideIn CH4 + O2 → CO2 + 2H2O
Only 2 atoms of O are in reactant side while 4 are in product side.Hence, the only equation in which the number of atoms in the reactants is the same as that of products is Zn + 2HCl → H2 + ZnCl2
More on balancing chemical equations can be found here: https://brainly.com/question/21049751
the precautions that must be taken when carrying out experiments with hydrogen gas
Explanation:
Never smoke near a place where hydrogen is generated or being used. Remove all possible sources of flame and sparks. Hydrogen should only be generated and used in a well ventilated out door area. Precautions must be taken to remove all possibilities of fire or explosion.
Given a thin sheet of tin foil as shown below, determine the thickness of the foil if the mass is 1.68 g and the density of tin is 7.31 g/cm^3. Show all of your work. Round your final answer to two digits and don't forget units. (4 points) *PLEASE HURRY*
Given :
Mass of foil , m = 1.68 g .
Density of foil , [tex]\rho=7.31\ g/cm^3[/tex] .
To Find :
The thickness of the foil .
Solution :
Let , length and breadth is l and b respectively .
Also , height be h .
Volume is given by :
[tex]V=l\times b\times h[/tex]
Density is given by :
[tex]\rho=\dfrac{m}{V}\\\\V=\dfrac{m}{\rho}\\\\l\times b\times h=\dfrac{1.68}{7.31}\\\\l\times b\times h=0.23\\\\h=\dfrac{0.23}{lb}[/tex]
Therefore , thickness of the foil is [tex]\dfrac{0.23}{lb}[/tex] .
Hence , this is the required solution .
In Rutherford's experiment, when particles strike the
zinc sulfide screen, they produce flashes of light or
scintillations which can be detected.
A-Gamma
b -Meson
C-Beta
d Alpha
Answer: D- Alpha
Explanation:
Calculate the following using the correct significant digits: 3.10 x 4.520
Answer:
6
Explanation:
2+2=6
Answer:
3.10 × 4.520 = 14.0
Explanation:
Sig Figs
3
Decimals
1
Scientific Notation
1.40 × 10'
