Which is most useful in classifying stars? (1 point)
A. knowing the movements of a star
B. knowing the size of a star
C. knowing the apparent magnitude of a star
D. knowing the color and brightness of a star
Answer:
B. Knowing the color and brightness of a star
Explanation:
Round the following number to 3 significant figures:
.003053456
.00310
.003
.00305
0.003053
Answer:
See explanation below for answers
Explanation:
0.00305
0.00310
0.00300
0.00305
0.00305
When there is a decimal point, you must skip the zeros until you reach a number. Once you reach that number, you move 2 more places to the right of that number in order to have 3 significant figures. Hope this helps!
Sorry for the spamming, but this question is URGENT here,
Which of the following is
property of metals?
A. brittle
B. good conductivity."
C. poor conductivity
(Btw here’s a picture :O)
Option B, Metals have good conductivity.
Hope it helps you.. pls mark brainliest if it helps you
20 points for right answer
Answer:The answer is in the attached file below
Explanation:
If your car gets 39.5 mi/gal how many gallons of gas would you use if you drive 474.2 miles? 1 mile=5280
Answer:
12 gal
Explanation:
474.2 mix 1 gal/39.5 mi = 12 gal
Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen
a
Chemical Change
b
Physical Change
Answer:
chemical changes
I hope it's helps you
What is the density of water (in g/mL) to fouf significant figures at 6°C?
Answer :
0.9999432 g/cm^3
The density of water in g/ml up to 4 significant figures at 6°C is 0.9999432 g/cm³.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant
Learn more about significant figures,here:
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5.
Flow chart related to the ionic bond in sodium chloride
An ionic bond is formed between sodium and chlorine in sodium chloride. The correct flow chart is shown below.
The question is incomplete, the complete question is;
Complete the flow chart related to the ionic bond in sodium chloride-Atomic number,Electronic configuration of atoms,Electronic configuration of ion,Symbol of sodium ion .please help me to find the answer
The flow chart related to the ionic bond in sodium chloride is as follows;
Atomic number of sodium ----> 11Atomic number of chlorine ------> 17Electronic configuration of sodium; 1s2 2s2 2p6 3s1Electronic configuration of chlorine; 1s2 2s2 2p6 3s2 3p5Electronic configuration of sodium ion; 1s2 2s2 2p6Electronic configuration of chlorine ion; 1s2 2s2 2p6 3s2 3p6Symbol of sodium ion; [tex]Na^+[/tex]Sodium is in group 1 of the periodic table. It contains 11 electrons as shown by its electronic configuration. It forms sodium ion by loss of one electron. Group 1 elements form an univalent positive ion.
Chlorine is in group 17 of the periodic table. It has 17 electrons. It forms chloride ion by gaining one electron leading to the formation of sodium chloride.
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How many milliliters are there in 1.0 microliter?
Answer:
0.001
Explanation:
I’m having trouble on problem number 5. and I can’t find the answer, and I could really use some help.
What best describes what the pH number indicates about a solution?
O A. How acidic the solution is
B. What its ionic strength is
O C. How strong the acid is
O D. What the Ka constant is
Answer:
A. How Acidic the solution is
Explanation: pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
Answer:
A
Explanation:
The pH of a solution indicates it's acidity or alkalinity. The pH scale is an inverse logarithm that ranges from 0 to 14. Anything below 7.0 (ranging from 0.0 to 6.9) is acidic and anything above 7.0 ( from 7.1 to 14. 0) is basic or alkaline.
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which branch science consist of?
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (biology, chemistry, physics, astronomy and Earth science), which study nature in the broadest sense; the social sciences (e.g. psychology, sociology, economics, history) which study people and societies; and the formal ...
Explanation:
The four major branches of science are, Mathematics and logic, biological science, physical science and social science. The first branch is mathematics & logic.
What device will you use to determine the volume of a liquid?
O Balance
Metric beaker
O Graduated cylinder
O Flask
Answer:
graduated cylinder
Bromine gas completely fills the bottle but liquid bromine just covers the bottom of the bottle
Explain why.
Answer:
Bromine is a dark reddish-brown fuming liquid with a pungent odor. Denser than water and soluble in water. Hence sinks in water.
Come up with 2 examples of derived units from everyday life.
Answer:
answer
Explanation:
Area : Square Meters,
Volume : Cubic Meters,
Density : Kilograms per Meter Cube,
Velocity : Meters per Second Squared,
Force : Newtons (Mass multiplied by Acceleration or Mass multiplied by Displacement divided by Time squared)…..
Which SI units would we use in place of inches, pounds and quarts?
Answer:
45
Explanation:
yes i need help please
Describe two ways you could model atoms in a substance.
Answer:
You can model a substance doing a Lewis structure
And also you can model it doing a bond-line structure.
Which statement describes a numerical result with good precision?
Answer:
poop
Explanation:
What are the opposites?
Answer:
The opposite action of boiling (liquid to gas, evaporation) is condensing
Sublimation is the opposite of deposition
Top antonyms for melting (opposite of melting) are frozen, advent and arrival.
Explanation:
on edg
What is the mass of six of these marbles? What is the volume? What is the
density?
Answer:
All right. So let's calculate the density of a glass marble. Remember that the formula for density is mass over volume. So if I know that the masses 18.5 g. And I know that the um volume is 6.45 cubic centimeters. I can go ahead and answer this to three significant figures. So it's going to be 2.87 grams per cubic centimeter. Okay, that's our density. Now, density is an intensive process. Okay. We're an intensive property. I really should say. It doesn't depend on how much you have. Mhm. If I have one marble, its density is going to be 2.87 g per cubic centimeter. If I have two marbles, the density will be the same because I'll double the mass and I'll also double the volume. So when I divide them I'll get the same number. Okay, that's what makes it an intensive property. No matter how many marbles I have, they'll have the same density. Mass though is not an intensive property. So if I have six marbles and I want to know what the massive six marbles is. Well, I know the mass of each marble is 18.5 g. So the mass of six marbles Is going to be 100 11 g. Because mass is an extensive property. It depends on how much you have. If I change the number of marbles, I'm going to change the mass. That's an extensive property. All right. So we've calculated the density. We've calculated the mass and then what happens to the density of one marble compared to six marbles as we mentioned before. Since densities and intensive property, the densities will be the same, no matter how may.
Explanation:
PLS HELP. DUE TODAY.
1. T or F? All protons in an element contain an identical number of neutrons.
2. An atom with a _____ charge has the same number of protons and electrons.
Answer:
1. falseno all protons in an element doesn't contain an identical number of neutrons . number of electrons and number of protons contain identical number but the number of neutrons may vary. for eg: protons and neutrons of hydrogen is 1 and 0 respectively whereas protons and neutrons of helium is 2 and 2 .
2.neutral chargegiải gấp giúp em câu này với ạ:
a) Hoàn thành các phan ứng sau dưới dạng phương trình phân tử và phương trình ion thu gọn:
- CaCO3 + HCl =>
- Fe(SO4)3 + NaOH =>
- KCl + ? => KNO3 + ?
- Na2S + H2SO4 =>
b) Viết PTPU của các phương trình ion thu gọn sau, xác định chất nào là acid, chất nào là bazo:
- H(+) + OH(-) => H2O
- OH(-) + HCO3(-) => CO3(2-) + H20
Explanation:
what do you have written I can't understand one word right a properly
group VIIA onmetals are called hologen?why
Answer:
The elements of Group VIIA (new Group 17 – fluorine, chlorine, bromine, iodine, and astatine) are called the halogens (tan column). The term “halogen” means “salt-former” because these elements will readily react with alkali metal and alkaline earth metals to form halide salts
what is the empirical formula of compound that is 64,8%,13,6%H and 21,6% O by mass?
Explanation:
Calculate the empirical formula. In any empirical formula problem you must first find the mass % of the elements in the compound. ... Then change the % to grams. ... Next, divide all the masses by their respective molar masses. ... Pick the smallest answer of moles and divide all figures by that.How many significant figures are present in the following number:
0.0001790497
Answer:
According to significant figures we have leading zeros, trapped zeros and zeros at the beginning. So that number is a leading zeros and its has 7 SGF.
cuantos gramos de soluto y solvente tendra 127 gramos de solición cuya concentración es 14% m/m
Iron in rock combining with oxygen to form hematite
a
Chemical Change
b
Physical Change
A sample of gas occupies 15.0 L at a pressure of 2.00 atm and a temperature of 27 degrees Celsius. If the pressure is lowered to 1.00 atm, and the temperature is raised to 127 degrees Celsius, what would be the new volume of the gas sample
Answer:
40.0 L
Explanation:
The formula to find the new pressure: [tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
P₁ = 15.0 L
V₁ = 2 atm
T₁ = 300 K (Convert Celsius to Kelvin by adding 273)
P₂ = 1
V₂ = ?
T₂ = 400 K
[tex]\frac{(2)(15)}{300} = \frac{P_2(1)}{400}[/tex]
[tex]\frac{30}{300} = \frac{P_2}{400}[/tex]
[tex]\frac{1}{10} = \frac{P_2}{400}[/tex]
Multiply both sides by 400 to isolate the P₂
[tex]\frac{400}{10} = P_2[/tex]
[tex]P_2 = 40[/tex]
5. Which state(s) of matter |s/ar epsilon easily compressible? Select all that apply.
-liquid
-solid
-gas
-none
Answer:
Gas
Explanation:
The atoms, ions, or molecules that make up the gas are further apart and move freely at high speeds and is can easily be compressible.
Answer:
Gas
Explanation:
A gas is a substance or matter in a state in which it will expand freely to fill the whole of a container' having no shape like a solid and no fixed volume like a liquid.
what is an homeostasis?
Answer:
it's a property of a cell, tissue and organisms that allows to maintain and regulate the stability and constancy to function properly