because it doesn't react easily with other elements it requires high heat and other things
The number 199,078 has how many significant digits?
I think it's 6
Explanation:
zeros between other nonzero digits are significant
ex. 50.3 has 3 significant figures. ex. 8101.01 has 6 significant figures
what are lower and higher energy levels.
Answer:
If an atom, ion, or molecule is at the lowest possible energy level, it and its electrons are said to be in the ground state. If it is at a higher energy level, it is said to be excited, or any electrons that have higher energy than the ground state are excited
Explanation:
pls mark brainliest
Multiple Choice Questions 1. Which of the following statement best describes an atom? A. Protons and electrons are grouped together in a random pattern. B. Protons and electrons are grouped together in an alternating pattern C. A core of protons and neutrons surrounded by electrons. D. A core of electrons and neutrons surrounded by protons. 2. Table 5.10 shows the atomic mass of four stable isotopes of an element X. 119
Answer:
C is Correct
Explanation:
Protons and Neutrons make up the Nucleus while Electrons surround the nucleus in circular orbits with continuous rotation.
If I initally have a gas at a pressure of 12 atm, a volume of 23 L, and a temperature of 200 K, and then I raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas?
Answer: 30 L
Explanation: Use the combined gas law: P1V1/T1 = P2V2/T2
We want V2, so rearrange:
V2 = V1(T2/T1)(P1/P2)
Note how I've grouped the temperature and pressure into ratios. This allows us to cancle those units quickly and gives a perspective on what we should expect. Enter the data:
V2 = (23L)*(0.6667)*(0.8571)
V2 = 29.6 L 30 L for 2 sig figs
Use the drop-down menus to complete the statements.
__________have a definite shape and volume.
__________do not have a definite volume or shape.
___________have a definite volume, but the shape may change.
Answer:
Solids, Gasses, Liquids
Explanation:
Solids are rigid structures that have a definite share and volume.
Gasses will continue to spread indefinitely until pressure prevents further spreading.
Liquids have a volume but take the shape of the container they are in.
If gasoline costs $3.13 per gallon, how many gallons of gasoline could you purchase for $21.00 ?
Round your answer to the nearest hundredth place.
____________ gallons
Answer:
7 gallons
Explanation:
Just do the math
$21 x 1 gallon/$3 =7 gallon
A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is it’s density
Answer:
1.6g/mL
Explanation:
Density equation is D=m/v
Density = g/mL
m=mass of sample in grams
v = volume of sample in mL
The volume of a square can be calculated by V=l*w*h.
In this case it is 5cm*5cm*5cm = 125cm^3
Since we know that 1cm^3 ~ 1mL we can convert the volume to mL as so:
125cm^3 (1mL/(1cm^3)) = 125mL
Then simply plug into the density equation:
D=200g/125mL = 1.6g/mL
HELP IM TIMED!!!!!!!!!
Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone? a. 1.3 bison/mi^2 b. 16 bison/mi^2 c. 77 bison/mi^2 d. 0.77 bison/mi^2
Answer:
A. 1.3 bison/mi^2
Explanation:
4500 bison divided by 3472 sq miles is 1.3 bison per mile squared.
Three blocks are shown. Which statement is correct?
Block A has the greatest density.
Block B has the greatest density.
The density of Block A is equal to the density of Block B.
The density of Block B is equal to the density of Block C.
Answer:
Block B i thinkExplanation:
i think its b
If acid spills on your shoulder, you should use the
Answer:
laboratory/safety shower.
Otherwise, immediately wash with water and tell your teacher or instructor.
ok guys! so! im in my first chemistry class and i dont understand what an ion is!! help please! i need a simple breakdown of how to understand chemistry
Explanation:
Review and Study Material Before Going to Class. ...
Take Good Notes. ...
Practice Daily. ...
Take Advantage of Lab Time. ...
Use Flashcards. ...
Use Study Groups. ...
Break Large Tasks Into Smaller Ones.
reading a variety of chemistry books
Answer:
An ion is an atom or molecule that carries an electric charge.
Ions are identified by the use of a superscript to show the sign and size of their electric charge.
Negatively charged ions are called anions, and positively charged ions are called cations.
Explanation:
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
Calculate the mass of 2.75 moles of ammonia.
Plz Fast Urgent
I will give brainliast
Explanation:
1 grams Ammonia to mol = 0.05872 mol
mass of ammonia = 2.75÷ 0.05872
mass of ammonia=46.8324250681 gm
Answer:
[tex]\boxed {\boxed {\sf 46.8 \ g \ NH_3}}[/tex]
Explanation:
We are asked to calculate the mass of 2.75 moles of ammonia.
1. Molar MassWe convert moles to grams using the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.
Look up the individual elements in the compound of ammonia: NH₃
Nitrogen: 14.007 g/mol Hydrogen: 1.008 g/molNotice that there is a subscript of 3 after H in the chemical formula. There are 3 moles of hydrogen in 1 mole of ammonia. We must multiply hydrogen's molar mass by 3 before adding nitrogen's molar mass.
H₃: 1.008 * 3 = 3.024 g/mol NH₃: 14.007 + 3.024 = 17.031 g/mol 2. Convert Moles to GramsWe convert using dimensional analysis. First, set up a ratio using the molar mass.
[tex]\frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]
We are converting 2.75 moles of ammonia to grams, so we multiply the ratio by this value.
[tex]2.75 \ mol \ NH_3 * \frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]
The units of moles of ammonia cancel.
[tex]2.75 * \frac {17.031 \ g \ NH_3}{ 1}[/tex]
[tex]46.83525 \ g \ NH_3[/tex]
3. RoundThe original measurement of moles (2.75) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 3 in the hundredth place tells us to leave the 8 in the tenth place.
[tex]46.8 \ g \ NH_3[/tex]
There are approximately 46.8 grams of ammonia in 2.75 moles of ammonia.
I need Help can someone help
Answer:
no bueno
Explanation:
Hello. Can someone help me do these few questions. Thanks
Answer:
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means. Wikipedia
Give one example of neutral oxides which turns colourless liquid at room temperature
Answer:
mercury
Explanation:
because mercury can get turned into liquid in any normal rrom temperature
Apakah perbezaan kakilauan permukaan rod kuprum dan karbon
Answer:
soalan ni yang ni tahun atau tingkatan
state two factors that determine the stability of isotope
Matter doesn't have to take up space as long as it has mass.
Answer:
Matter always takes space (or has volume).
Answer:
False. Everything that has mass takes up space.
Explanation:
A pan containing 20.0 grams of water was allowed to cool from a temperature of 95.0 °C. If the amount of heat released is 1,200 joules, what is the approximate final temperature of the water?
75 °C
78 °C
81 °C
87 °C
Answer:
81 °C
Explanation:
This is a calorimetry question so a few things you will need for this. The calorimetry equation q=mcΔT & the specific heat of water (4.2J/g•°C). Other definitions are:
q = heat added/released by a sample
m = mass of sample
c=specific heat of sample
ΔT = change in temperature
from here we can rearrange the equation to state:
q/(mc) = ΔT
1200J/((20.0g)(4.2J/g•°C)) = ΔT
14°C = ΔT
If the starting temperature was 95.0°C and we know that the temperature was cooled by 14°C then the final temperature of the water would be 81.
Answer:
C. 81 c
Explanation:
took the test :)
The charge of most poly atomic ions is _____
Explanation:
They mostly have negative charges
11:48 Tue 24 Aug
47%
3. Graphite, aform of carbon, conducts electricity because it has:
(1 Point)
Answer:
carbon because it is the main answer of these
hi <3
graphite is able to conduct electricity because it has delocalised electrons.
explanation:
carbon can bond 4 times, but in graphite it is only bonding to three other carbons, leaving one electron free to carry charge
hope this helps <33
Can someone help me on this
What effect does fermented sugar have in beer brewing
Answer:
If the sugar concentration level of the must becomes too high at any given point--either at the beginning or during the fermentation--it starts to have an inhibiting effect on the yeast's ability to produce alcohol. In other words, the higher sugar concentration starts to act as a preservative effecting the fermentation in a negative way.
Explanation:
Fermentation is the process by which yeast converts the glucose in the wort to ethyl alcohol and carbon dioxide gas -- giving the beer both its alcohol content and its carbonation.
measure 25 mL of water in a 50 mL graduated cylinder. pour the 25 mL of water into the 250 mL beaker and record the mass of the beaker + water. Now find the mass of just the water.
Answer:
so i think mass of water is 235 ml
At constant pressure and volume, the density of a gas _____ as the molar mass increases. A gas made of heavier particles will have a _____ density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Answer:
Increases, higher
Explanation:
Remember that the formula for Density is D=mass/volume.
If volume remains the same, as mass increases the density will also increase as the numerator of this math problem increases while the denominator remains the same.
(a) At constant pressure and volume, the density of a gas increases as the molar mass increases.
(b) A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Ideal gas equationThe relationship between density and molar mass is given in the following equations;
PV = nRT
PV = (m/M) RT
PV = (ρV/M)RT
P = (ρ/M)RT
P = (ρRT)/M
PM = ρRT
where;
P is pressureρ is densityM is molar massThus, we can conclude that, at constant pressure and volume, the density of a gas increases as the molar mass increases.
A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Learn more about density of gases here: https://brainly.com/question/18992505
the atomic number of calcium is 20 . the maximum possible numbers of electron in m-shell is a 2 b 8 c 18 d 10
Answer:
8
Explanation:
Electronic configuration of Calcium = 2, 8, 8, 2
M shell = 3rd energy level
Maximum number of shells in m shell is 8
10.74cm^3 to liters
Please show a step by step process on how to solve.
Answer:
I HOPE IT WILL HELP YOU A LOT.
Calculate the density of sulfuric acid if 50. mL of the acid weighs (mass) 144. g.
a
b. 3.6 g/mL
b
d. 1.8 g/mL
c
a. 4.8 g/mL
d
b. 2.0 g/mL
Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
mass = 144 g
volume = 50 ml
We have
[tex]density = \frac{144}{50} \\ = 2.88[/tex]
We have the final answer as
2.88 g/mLHope this helps you
How would you change the type of atom
Answer:
Hi, There! :)
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element.
Answer:
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element. All known elements are arranged on a chart called the Periodic Table of Elements.
Explanation:
that's what I found buddy
Describe hydrogen's atomic structure and its molecular structure.
Explanation:
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe.
Names: hydrogen atom, H-1, protium, ¹H
Protons: 1
Neutrons: 0
Symbol: 1H
Answer:
The hydrogen atom has a nucleus consisting of a proton bearing one unit of positive electrical charge; an electron, bearing one unit of negative electrical charge, is also associated with this nucleus.
Explanation: