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 need help what is the Find the value of x
Answer:
45 degrees
Explanation:
as you can see, the box in the corner states that both the angles together are 90 degrees, and half of that is 45. 90/2=45
I am a common cation that is found in the alkali group. I am found in salt. I have a +1 charge. What am I?
Answer:sodium
Explanation:
Sodium
Which is a change or signal in the environment that can make an organism
react? *
stimulus
O reaction
impulse
O
response
Answer:
I'm pretty sure its stimulus
Two or more atoms that have been chemically combined are
called a
Answer:
compound
Explanation:
9. First identify the following as either homogeneous substances or
heterogeneous mixtures. Then further classify as either elements,
compounds or mixtures:
a. Earth
i. Air
b. H(9) I
j. CuSO4(s)
C. Cuso, (aq)
k. NaCl (1)
d. Magnesium solid
1. Methane gas
e. Na (s)
m. Antimony (1)
f. Sugar (1)
n. H20 (1)
g. C.H2O. (aq)
o. 02 (9)
h. NaCl (aq)
p. CO (9)
Answer:
a few days ago of course I was a in the my life pro chef chef cooking channels and then the first first place to for the you know what do not you can be you know how much
The number of electrons in the first three energy levels for four neutral elements is shown in the table. The element with the highest ionization energy is-
Answer:
The correct option is;
Element 2
Explanation:
The ionization energy is the energy required to eject an electron from a gaseous ion or atom
The ionization energy increases across the period and increases up the group
The elements with the highest ionization energy are those that have the complete octet structure in their outermost shell, which are the noble gases
Therefore, given that element 2, which has the complete octet structure in the outermost shell, then it is an element of the noble gases which have the highest ionization energy in a period, and therefore has the highest ionization energy.
On the periodic table, the element with 10 electrons is Neon, with ionization energy of 2080.68 kJ/mol which is the second highest after helium, that has only 2 electrons.
The relative formula mass (M) of a Group 2 metal carbonate is 197
Relative atomic masses (Ar): C = 12
O = 16
Calculate the relative atomic mass (Ar) of the Group 2 metal in the metal carbonate
Name the Group 2 metal.
The relative atomic mass (Ar) : 137 and the element : Ba
Further explanationThe naming of chemical compounds is giving a special name to a compound that aims to facilitate the classification of compounds and facilitate the identification of a compound. The rules for naming chemical compounds have been determined by the IUPAC (International Union of Pure and Applied Chemistry)
This nomenclature includes the naming of ion compounds, covalent compounds, and polyatomic
The molar mass of a compound is given by the sum of the relative atomic mass of Ar
M AxBy = (x.Ar A + y. Ar B)
Group 2 metals have a +2 charge : M²⁺
So the compound of metal carbonate : MCO₃
Ar C = 12, O = 16
M MCO₃ = (1.Ar M + 1. Ar C+ 3. Ar O)
[tex]\tt 197=1. Ar~M+1.12+3.16\\\\197=Ar~M+12+48\\\\Ar~M=137[/tex]
The element with relative atomic masses 137 is Ba
So the compound : BaCO₃
Use the information given to calculate the average atomic mass of element Z. Z- 56 is 70% abundant and Z-59 is 30% abundant.
Answer:
56.9 amu
Explanation:
Depending on the number of isotopes an element has, the Average atomic mass of isotopes of an element can be calculated using:
(atomic mass of isotope1 × decimal abundance of isotope1) + (atomic mass of isotope2 × decimal abundance of isotope2)
According to this question, two isotopes of element Z were given
- Isotope Z- 56 with atomic mass 56 is 70% abundance. This means that its decimal abundance is 0.70
- Isotope Z- 59 with atomic mass 59 is 30% abundance. This means that its decimal abundance is 0.30
Therefore, average atomic mass of element Z is:
= (56 × 0.70) + (59 × 0.30)
= (39.2) + (17.7)
= 56.9
An object has a mass of 20 g and volume of 10 cm. Enter the numerical value for the density of the object in units of g/cmº
Answer:
density = 2g/cm³
Explanation:
density = mass/volume
mass = 20g
volume = 10cm³
density = 20g/10cm³
density = 2g/cm³
What is the total number of protons, electrons, and neutrons found in one atom of
iron, Fe, with a mass number of 56?
Answer:
The most common atom of iron has 26 protons and 30 neutrons in its nucleus
Select all the correct answers.
Regina is testing this hypothesis:
Higher relative humidity leads to faster growth in orchids.
She has designed an experiment in which she will grow orchids in terrariums of varying humidity levels. She will then observe how the humidity affects the growth of the plants.
Which of the following variables are the confounding variables that Regina should control for before beginning her experiment?
1.the amount of sunlight the plants receive
2.the temperature at which the plants grow
3.the type of soil in which the plants grow
4.the growth rate of each of the plants
5.the relative humidity inside each terrarium
Answer:1,2,&3
Explanation:
four and five would not qualify as confounding variable‘s
Which roller coaster
car has the least potential energy due to gravity
Answer:
the roller coaster car with the least potential energy would be the one at the bottom of the roller coaster
Explanation:
Hope this helped
How does a cold trap catch pollutants in smog?
Answer:
A temperature inversion occurs when air near the ground is relatively cool, and there is a layer of warmer air above it. That upper layer of warm air keeps the cooler air from rising, and traps all of the pollution in the cooler, lower layer.
Explanation:
Hope this helps
Crown me as brainliest:)
C12H7Cl3FNaO2 what are them elements in that chemical formula
what do you think would be a good science fair project for an 8th grade advanced class?
Answer:
maybe something about planets or the solar system and they have to make them
Explanation:
Answer:
create a rainbow of flames or build an infinty mirror
Explanation:
pure sodium and chlorine are extremely dangerous, but when combined the result in substance that we use every day. How do you think the properties of sodium and chlorine change when they are combined to make sodium chloride?
Answer:
Explanation:
chlorine has 7 valence electrons while sodium has 1. on their own, they are very reactive elements. a full valence electron shell has 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive. when sodium and chlorine are combined to form sodium chloride (table salt), it is no longer dangerous. the number of valence electrons changes its reactivity and how it combines.
The properties of sodium and chlorine change when they are combined to make sodium chloride should be explained below.
Information regarding chlorine:chlorine comprises of 7 valence electrons while on other hand, sodium has 1. A full valence electron shell contains the 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive.
learn more about substance here: https://brainly.com/question/19287431
Calculate the average atomic mass of silver if 13 out of 25 atoms are silver -107 and 12 out of 25 atoms are silver -109
Answer: 107.96amu
Explanation:
(107x.52)+(109x.48)
55.64+52.32=107.96
what best explains the cause of strong winds on a island?
Which model represents an element?
Answer: Water. Earth. Fire. Air.
Explanation: the four nations lived together in harmony. Then, everything changed when the Fire Nation attacked. Only the Avatar, master of all four elements, could stop them, but when the world needed him most, he vanished. A hundred years passed and my brother and I discovered the new Avatar, an airbender named Aang. And although his airbending skills are great, he has a lot to learn before he's ready to save anyone. But I believe Aang can save the world."
7. Electrons that are free to move in a metal are referred to as ________ electrons.
A.magnetic
B.valence
C.electrostatic
D.cation
Answer:
D; Cation
They are the valence electrons that can move between two metal molecules.
Reducing child __________, or rate of death, is one of the primary goals of the UN’s Millennium Development Goals.
A.
mortality
B.
maternity
C.
infirmity
D.
infection
Answer: A
Explanation: Mortality means death. And it is a primary goal of Development Goals
Reducing child mortality, or rate of death, is one of the primary goals of the UN’s Millennium Development Goals and the correct option is option A.
What is Mortality?Mortality is defined as the state of the individual being dead. The mortality rate is the death rate of a population which is calculated on the basis of the deaths in the particular region.
Mortality as one of the components of demography is measured as mortality rate.
Mortality meaning provides the basis for mortality rate and its estimation. Mortality is the possibility of and susceptibility to death, and hence, the rate of mortality or the death rate is the measurement of the number of deaths that occur in a particular population, scaled to the size of that population per unit of time.
Therefore, Reducing child mortality, or rate of death, is one of the primary goals of the UN’s Millennium Development Goals and the correct option is option A.
Learn more about Mortality, here:
https://brainly.com/question/6344227
#SPJ3
A snicker bar has 300. Kcal, how many Joules of energy does it contain?
Answer:
1255200J
Explanation:
1 cal = 4.184 J
1kcal = 4184 J
thus, 300 kcal= 4184 × 300
= 1255200J
= 1255.2 kJ
= 1.2552 MJ
What measuring tool is used to find the volume of a shoe box?
A.water displacement
B.scale
C.beaker
D.ruler
Answer:
D. Ruler
Explanation:
Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.
Nuclear energy is currently used in which three kinds of vehicles?
Answer:
A. cars, submarines, spacecraft
Explanation:
I took the test.
Help please if you can answer this first I'll give you the brainliest
Answer:
1. gas
2. false
Explanation:
Examine the layers of rock. Identify and explain which layer contains the youngest fossils.
Earth layers with fossiles in each labeled top to bottom A to D.
Answer:
Layer A is the youngest
Explanation:
It is at the top, it has all of the dinosaur bones which got buried after earth got hit with an asteroid and they went extinct. Layer D started it and all of these years dirt, soil, and fossils have been gathering making each layer before older and older.
How many atoms are present in 48.60 g ofMg
Answer: Explanation:
There are 6.02 x 10^23 atoms in 1 mol.
the advantage of asexual reproduction is.
a. There are no genetic mutations
b. reproduction doesn't require a mate
c. increase genetic variation
Answer:
1.) Genetic Variation, 2.) reproduction doesn't require a mate.
Explanation:
These are the only two that actually make sense in the blanks, So trust me or trust the other two answers.Your choice.
HELPS MEEEEEEEEEEEEE!!!!!!!!!!!!!
Conduction is ______________.
A. When particles transfer energy by touching.
B. None of these
C. When the sun warms an object.
D. The flow between warm and cool sections of a fluid.
Answer:
a
Explanation:
Answer:A. When particles transfer energy by touching.
Example: After a car is turned on, the engine becomes hot.
Which of the following conclusions can be made about the sedimentary layers?
bed 2 was deposited after bed 3
bed 2 was deposited before bed 3
bed 3 was deposited before bed 1
bed 1 is the youngest
Answer:
I think it's the second one im not sure tho
Hope this helps :)