Answer:
5.27
Explanation:
A beaker contains three solids: flour, sugar, and baking soda. Which
describes the contents of the beaker? *
Answer: It is a Heterogeneous mixture.
What are some characteristics of desert biomes ?
H3PO4 +CaCOH)2=Ca3(PO4)2+H20
Answer:
2H3PO4+ 3Ca(OH)2=Ca3(PO4)2+6H20
What is the correct name for this compound?
B₂H3
Answer:
The correct name is barium (dihydrogen/dihydride
Explanation:
chemical bond where electrons are shared and usually formed between two nonmetals
Choose all the answers that apply, The cardiovascular system transports material for the _____.
Answer:
vines or body vessels
Explanation:
Veins are vessels of the circulatory system that support circulation by conveying blood to the heart. Blood flowing through the circulatory system transports nutrients, oxygen, and water to cells throughout the body.
Answer: Respiratory system.
Explanation: The cardiovascular system transports oxygen and carbon dioxide for the respiratory system. Not the best explanation but I hope this help ya, good luck! ;D
P +
Cl2 →
PC13
Balance the chemical equation
Answer:
2P + 3Cl2 => 2PCl3
Explanation:
is the plates under Ande thin or thick?
Answer:andre plates is thin
Explanation:
The half-life of Co-59 is 35 days. How much of a 610.0-gram sample will remain after 140 days?
Answer:
Amount left after 140 days is 38.125 g.
Explanation:
Given data:
Half life of Co-59 = 35 days
Total mass of sample = 610.0 g
Sample remain after 140 days = ?
Solution:
Number of half lives passes during 140 days:
Number of half lives = T elapsed / Half lives
Number of half lives = 140 days / 35 days
Number of half lives = 4
Amount left:
At time zero = 610 g
At first half life = 610 g/2 = 305 g
At second half life = 305 g/2 = 152.5 g
At 3rd half life = 152.5 g/2 = 76.25 g
At 4th half life = 76.25 g /2 =38.125 g
Amount left after 140 days is 38.125 g.
Which scientist discovered the neutron and gave us the current basic model of
the atom?
A James Maxwell
B John Dalton
C James Chadwick
D Sir Isaac Newton
Answer:
c
Explanation:
i read a artical on him and it said
love yall;]
The molar mass of silicon (Si) is 28.09 g/mol. Calculate the number of atoms in a 92.8 mg sample of Si.
Explanation:
one mole of any substance there are 6.022×1023 units of that substance. (This number is called Avogadro's number, NA.)
We need to convert the mass of silicon to moles using the molar mass of silicon, 28.06gmol. This number means that one mole of pure silicon would have a mass of 28.06g. Our given mass, however, is in milligrams; to convert this to grams we'll use the conversion factor 1g103mg:
5.86mg Si(1g103mg)=0.00586g Si
Now, using silicon's molar mass, we'll convert this mass to moles of Si:
0.00586g Si(1mol Si28.06g Si)=2.09×10−4mol Si
Finally, let's use Avogadro's number to convert
The number of atoms in a 92.8 mg sample of Si is 1.99×10²¹ atoms
From Avogadro's hypothesis, we understood that:
1 mole of Si = 6.02×10²³ atomsRecall,
1 mole of Si = 28.09 g
Now, we shall convert 28.09 g to mg. This can be obtained as follow:
1 g = 1000 mg
Therefore,
28.09 g = 28.09 × 1000
28.09 g = 28090 mgThus, 28.09 g is equivalent to 28090 mg
Therefore,
28090 mg of Si = 6.02×10²³ atomsFinally, we shall determine the number of atoms in 92.8 mg sample of Si. This can be obtained as follow:
28090 mg of Si = 6.02×10²³ atoms
Therefore,
92.8 mg of Si = [tex]\frac{92.8 * 6.02*10^{23}}{28090}\\[/tex]
92.8 mg of Si = 1.99×10²¹ atomsThus, 92.8 mg sample of Si contains 1.99×10²¹ atoms
Learn more: https://brainly.com/question/5809151
The diagram is a model of a molecule of methane. What is the formula for methane?
Answer:
CH4
Explanation:
Please help brainiest is award.
the blue one i think dont quote me on it. Dont hate
Answer:
Explanation:
2nd one
kinda hard to see it tho
Grade
An aqueous solution of blue copper(II) ions can react with chloride ions to form a yellow
7-9
copper compound. The ionic equation for this reaction is: Cu2+ + 4C [CuCl]
-.1 The forward reaction is endothermic. What two things can you say about the enthalpy change for
the reverse reaction?
Answer:
pp
Explanation:
the similarity between oxygen and carbon dioxide.
what does the data mean for people involved in farming and agriculture?
Answer:
ummmmmmmmmmmmmmmm
Explanation:
Answer: well im taking the test right now. and i dont know so yah. good luck HAH
Explanation:
Please help I’ll give brainiest.
An airplane travels with a constant velocity of 210 m/s and in the upper atmosphere where the plane is traveling there is a wind that is blowing at a constant velocity of 60 m/s to the east. Determine the resultant velocity for the plane when it is traveling
Answer:
hello your question is incomplete the options are missing
Determine the resultant velocity for the plane when it is travelling
i) To the east
ii) To the west
answer :i) 270 i
ii) -150 i
Explanation:
velocity of Airplane = 210 m/s
wind velocity = 60 m/s to the east
The resultant velocity for the plane when it is travelling
let the velocity of the wind = V2
velocity of the plane = v1
i) The resultant velocity for the plane when travelling to the east
Vr = V2 i + V1 i
Vr= 60i + 210i = 270i
ii) resultant velocity when the plane is travelling to the west
Vr = - V1 i + V2i
= -210i + 60 i = -150 i
What are the three phases of matter
how does molecule movement in solids and liquids differ
Which of these are intensive properties? There can be more than one answer.
A) a substance has a density of 4.13 g/cm3
B) a substance has a melting point of 40°C
C) a substance is very malleable (it can be hammered into a shape)
D) a substance has a mass of 1.25 g
E) a substance has a volume of 5.4 mL
The intensive properties among the options provided are:
A) a substance has a density of 4.13 g/cm3
D) a substance has a mass of 1.25 g
E) a substance has a volume of 5.4 mL
Intensive properties are those that do not depend on the amount or size of the substance but are characteristic of the substance itself.
These properties, density, mass, and volume, are intrinsic to the substance and do not change with the quantity of the substance present. They are independent of the amount of the substance and remain constant regardless of the sample size.
On the other hand, melting point (B) and malleability (C) are not considered intensive properties. Melting point can vary depending on external conditions such as pressure, and malleability is influenced by the structure and composition of the substance, which can be affected by impurities or processing methods. These properties can change with the amount or size of the substance and are considered extensive properties.
Learn more about Intensive properties from the link given below.
https://brainly.com/question/13055036
#SPJ2
How is a mixture different from a pure substance?
A. Pure substances are made up of mixtures.
B. A pure substance is heterogeneous.
C. A mixture is made of one substance.
D. Mixtures can be separated by physical means.
Answer: ITS D
Explanation: i was just looking answers for my test and this is my sisters account
4/9+3/9=what is the answer to this problem
Answer:
7/9
Explanation:
4+3=7
leave the denominators be
The most reactive metals are located in which area of the periodic table?
A. top
B. far left
C. far-right
D. center
Answer:
the correct answer is B. far left
Explanation:
i just got it right on edge 2020 :p
help wit science thanks !
Answer:
Possibly
Explanation:
An overseas flight leaves New York in the late afternoon and arrives in London 8.50 hours later. The airline distance from New York to London is about 5.6x103 km, depending to some extent on the flight path followed. What is the average speed of the plane, in kilometers per hour to the correct number of significant digits?
Answer:
v = 658.82 km/h
Explanation:
The distance between New York and London is [tex]5.6\times 10^3\ km[/tex]
Time taken from New York to London is 8.5 hours
We need to find the average speed of the plane.
Total distance covered divided by the total time taken is equal to the average speed of an object. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{5.6\times 10^3\ km}{8.5\ h}\\\\v=658.82\ km/h[/tex]
So, the average speed of the plane is 658.82 km/h.
At 170C, a sample of hydrogen gas occupies 125cm3. What will be the volume at 1000C? =161cm3 If the volume of a given mass of gas at 00c is 27.3cm3. What will be the volume of the gas at 100c, pressure remaining constant? (a) 2.73cm3 (c) 28.3cm3 (c) 37.3cm3 (d) 273cm
1. V= 161
2. V = 37.3
Further explanationCharles's Law states that
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V1}{T1}=\dfrac{V2}{T2}[/tex]
1.
[tex]\tt \dfrac{125}{17+273.15~K}=\dfrac{V2}{100+273.15}\\\\V2=160.7\rightarrow 161~cm^3[/tex]
2.
[tex]\tt \dfrac{27.3}{0+273.15`K}=\dfrac{V2}{100+273.15}\\\\V2=37.3~cm^3[/tex]
Please answer the following questions with the proper significant figures:
[You are welcome to use calculator. Just remember that calculator doesn't do sig fig for you]
a) (32.670+1.2204)-14.0 =
b) 12.080 x 4.050 x 0.231 =
c) (3.051 x 103) x (2.00 x 10-2) =
a)32.670 + 1.2240 = 33.8904
33.8904-14.0 = 19.8904
b)12.080 × 4.050 × 0.231
=54.36 × 0.231
=12.55716
c)(3.051 × 103) ×(2.00 × 10.2)=
314.253 × 20.4 = 6410.7612
PLZ HELP:Use the words below to complete the concept map
Answer:
1. Mixtures
2. Solutions
3. Heterogeneous
4. Sand-water
5. Salt-water mixture
6. Water
Explanation:
1. Indeed, Matter could exist and substances or Mixtures, which is also subdivided into two.
2. These substances can also be in the form of solutions.
3. Heterogeneous on the other hand refers to mixtures that are not totally uniform such as Sand-water.
4. Sand-water are good examples of Heterogeneous mixtures.
5. Salt-water mixture falls under the category of homogeneous mixtures as they are totally uniform.
6. Water is also an example of a homogeneous mixture because basically two elements Hydrogen and Oxygen combine uniformly to form water.
What is stopping the Moon from flying off in a straight line away from the Earth?
earths gravitational field?