Answer:
H2O is a compound because its a main constitute of earths hydrosphere
Methane gas reacts with oxygen by combustion. How many moles of methane are needed to produce 3.5x10^-4 moles of carbon dioxide?
Answer:
3.5×10^-4 moles of methane is needed.
5. Explain how atoms and elements differ from one
another.
Answer:
A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.
Explanation:
Use this formula: Q=(m)(∆T)(Csp), where Q is heat (what you’re solving for), m is mass in grams (g), ∆T is the change in temperature (ending temp. minus beginning temp.) in degrees Celsius (∘C), and Csp is the specific heat capacity in joules per gram per degree(J/g ∘C). The answer will be in joules of energy (J).
Just multiply all three quantities given in the text together (as it shows in the formula!) to get Q. But remember, you have to figure out the change in temperature (like 10 ∘C to 50 ∘C is a change of 40 ∘C).
1. A calorimeter holds 75 g water at 26°C. A sample of hot copper is added to the water. The final temperature of the water and copper is 39°C. What is the change in enthalpy associated with the change in the water’s temperature? The specific heat capacity of water is 4.19 J/g°C.
2. A chemist heats a 215-g sample of iron from 25.0°C to 90.0°C. How much heat did the iron absorb? The specific heat capacity of iron is 0.45 J/g°C.
1. Q = 4085.25 J
2. Q = 6288.75 J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
A calorimeter is a device used to measure the specific heat of material
1. mass of water : m= 75 g
T1 = 26°C
T2 = 39°C
Csp = 4.19 J/g°C.
[tex]\tt Q=m.c.\Delta T\\\\Q=75\times 4.19\times (39-26)\\\\Q=4085.25~J[/tex]
2.mass of iron = 215 g
T1 = 25°C
T2 = 90°C
Csp = 0.45 J/g°C.
[tex]\tt Q=m.c.\Delta T\\\\Q=215\times 0.45\times (90-25)\\\\Q=6288.75~J[/tex]
This process of heat transfer by conduction would NOT work __________
A) in space.
B) in a solid.
C) under water.
D) in the atmosphere.
Science
Answer:
B and C are the correct answers.
A. Can you use mass alone to predict whether an object will sink or float?
Answer:
yess
Explanation:
how did robert hooke contribute to the cell theory?
A. he invented the microscope
B. he said cells can be created from other cells
C. he created cells in his lab
D. he was the first person to use the term “cells”
Answer:
D - He was the first person to use the term Cells.
Explanation:
Hooke invented the first compound light microscope (not first microscope) and he examined a cork and saw that it was made up of thousands of empty pockets which he later called 'Cells'.
Hope it Helps! :D
two atoms are isotopes of the same element, the atoms must have
Answer:
the answer is isotopes
I hope this will help you
I REALLY NEED THIS!!!! FOR MY STUDY GUIDE!!! MY QUIZ IS TOMORROW!!!!!!
How many electrons, protons, and neutrons are contained in each atom?
a. 132/55 Cs
b. 59/27 Co
c. 163/69 Tm
d. 70/30 Zn
When elements form ionic bonds, each atom is left with a __________________ outer shell.
WILL MAKE BRAINLIEST !!! help plssss
Answer:
Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge.
HOPE DAT HELPS BRO!
A beaker with a pale liquid in it massed 84.2 grams on a digital balance. Its volume read 42mL
Answer:
320 ml
Explanation:
A fluorescent light tube has an internal volume of 400 cm and an internal pressure of 200 kPa.
It is filled with 0.03 moles of an ideal gas.
What is the temperature of the gas inside the fluorescent light tube?
A 3.21 x 10 K
B 3.21 x 10?K
с 3.21 x 105K
D 3.21 x 10K
with explanation plz
Answer:
Temperature of gas is 3.21×10² K
Explanation:
Given data:
Volume of bulb = 400 cm³ (400/1000 = 0.4L)
Pressure of bulb = 200 KPa (200/101= 1.974 atm)
Number of moles of gas = 0.03 mol
Temperature of gas = ?
Solution:
Formula:
PV = nRT
R = general gas constant = 0.0821 atm.L/ mol.K
1.974 atm × 0.4 L= 0.03 mol × 0.0821 atm.L/ mol.K × T
0.7896 atm.L = 0.002463 atm.L/K × T
T = 0.7896 atm.L / 0.002463 atm.L/K
T = 321 K 0r 3.21×10² K
PLEASE ANSWER FAST
A model of an atom is shown above. The blue dots represent electrons, and the red dot represents the nucleus. This model accurately represents
A.
that electrons are found everywhere in an atom, even in the nucleus.
B.
what an atom would look like when seen through a microscope.
C.
that a single atom may have many nuclei.
D.
that the nucleus is located at the center of the atom.
Answer:
D. that the nucleus is located at the center of the atom
I hope that this helps!
There are several atomic models which explain the structure of atoms. Here the given model of atom is similar to Rutherford's model of atom. The nucleus is located at the center of the atom. The correct option is D.
What is Rutherford's atomic model?In Rutherford's atomic model, he bombarded a thin sheet of gold foil with high energy alpha particles and made several observations. He said that most of the space inside the atom is empty. A heavy positively charged body called nucleus is present inside the atom.
The nucleus is capable of repelling and deflecting highly energetic alpha particles and also has a appreciable mass and charge. The volume occupied by the heavy positively charged body must be very very small.
Here in the given model, blue dots are electrons which revolve around the nucleus and the red dot is the nucleus which is present at the centre.
Thus the correct option is D.
To know more about Rutherford's model, visit;
https://brainly.com/question/30366944
#SPJ6
What is the difference between an atom and an element? a An atom cannot be cut into smaller, but an element is a group of atoms that are the same b An atom makes up matter but an element does not c An atom can be combined but an element cannot be combined d An atom can be cut apart but an element cannot
Answer:
c.
Explanation:
One of the main differences between an atom and an element is that an atom can be combined but an element cannot be combined. There are many combinations of atoms that make up different gases, liquids, and solids each with a unique makup. For example, water is made up of two hydrogen atoms and one oxygen atom (H20). Elements are made up of only the same type of atom. For example, the element Hydrogen can only contain hydrogen atoms, while the element Carbon can only contain carbon atoms.
an isotope or barium (atomic number 56)has an mass of 138.how many neutrons are in the nucleus of this isotope
Answer:
Diagram of the nuclear composition and electron configuration of an atom of barium-138 (atomic number: 56), the most common isotope of this element. The nucleus consists of 56 protons (red) and 82 neutrons (blue).
The variable placed on the horizontal or x-axis of a graph is what variable
Answer:
Independent variable
Explanation:
Question 5 of 10
SO3 is an empirical formula for which of the following?
A. S04
B. S203
C. S402
D. S206
It is made up of two or more compounds is it mixture
or compound?
Answer:
mixture
Explanation:
why is hydrogen not used as fuel for domestic purposes
Explanation:
It is because hydrogen is a highly combustible and it reacts explosively when it comes in contact with air. And hence as a result, storing of the hydrogen gas is difficult and is dangerous at the same time.
What is the density of a sample of the alloy pewter, (a mixture of tin and copper or lead) if a 7.11 cm3 sample has a mass of 53.137g?
Answer:
The answer is 7.47 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 53.137 g
volume = 7.11 cm³
We have
[tex]density = \frac{53.137}{7.11} \\ = 7.473558368...[/tex]
We have the final answer as
7.47 g/cm³Hope this helps you
help me, please, i need it
Answer:
I think the answer would be C.
Explanation:
Microwaves emit radiation onto the leftover food, meaning the heat transfers to it through radiation.
What is surface area?
What reaction would the chemical equation 2H2O→2H2+O2 represent? helppppp!!!
decomposition of water
formation of water
replacement of water
combustion of water
Answer:
C. Decomposition of water
Explanation:
A decomposition reaction occurs when one reactant breaks down into two or more products.This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
The equation for the decomposition of water; 2H2O --> 2H2+O2
Answer:
Decomposition of water!
Explanation:
I just took the test, hope it helps!
What are the three main technical support options for Microsoft users? Find It Myself, Ask the Community, Get Live Help Communities, Find It Myself, Guide Me Fix a Problem, Find It Myself, Communities Ask the Community, Get Live Help, Fix a Problem
Answer:
Find It Myself, Ask the Community, Get Live Help
Explanation:
The three main options for Microsoft users are Find It Myself, Ask the Community, Get Live Help. The first of which is finding it yourself through the search menu or help guidelines provided by Microsoft in all of their operating systems. Secondly, would be asking the community through search engines such as Google or through Microsoft help forums. Lastly, would be getting live help since Microsoft opertaing systems have a remote desktop feature that allows you to connect to another IT professional from a distance, or you can simply contact an IT professional to visit you in person for technical assistance.
True or False?
To increase acceleration of a object, you reduce its mass or increase the applied force.
Quick chem question!
I will mark as BRAINLIEST!!!
Answer:
D
Explanation:
A and C sounds not logic
B is wrong since all the molecules has different numbers of carbon and hydrogen
D sounds correct because triple covalent bond exist at the C-C bonding
Please HELP HELP ME!!!
Imagine that you're writing a paper on the topic of ocean acidification. Find two articles about ocean acidification on the Internet that you could use in your research. Name them Source 1 and Source 2, and include a link to each source. Be sure to also include the name of the website or organization that published the source.
Answer:
See explanation
Explanation:
When you are writing a scholarly paper, you have to conduct a thorough search for source materials online. These sources must be reliable, credible and contain verifiable information. In a project such as writing a paper on the topic 'ocean acidification', the following materials are relevant;
Source 1) 'Functional impacts of ocean acidification in an ecologically critical foundation species,'; Brian Gaylord, Tessa M. Hill, Eric Sanford, Elizabeth A. Lenz, Lisa A. Jacobs, Kirk N. Sato, Ann D. Russell, Annaliese Hettinger; Journal of Experimental Biology 2011 214: 2586-2594; doi: 10.1242/jeb.055939
Source 2) 'Impacts of ocean acidification on marine fauna and ecosystem processes'; Fabry, V. J., Seibel, B. A., Feely, R. A., and Orr, J. C. ; ICES Journal of Marine Science, 65: 414–432; doi: 10.1093/icesjms/fsn048
Which element will be more reactive - Mg (magnesium) OR Se (Selenium)? *
Answer:
magnesium
Explanation:
magnesium is in Group 2, in the periodic table. this means that it has 2 valence electrons. the less valence electrons an element or atom has, the more reactive. Selenium has 6 valence electrons. as a result, Mg is more reactive
Convert 645 Newtons per quart to tons per liter. (The picture is a conversion table for help)
Answer:
0.067 ton/Litre.
Explanation:
645 Newtons per quart to tons per liter.
We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:
1 N/q = 100 g/q
Therefore,
645 N/q = 645 N/q × 100 g/q / 1 N/q
645 N/q = 64500 g/q
Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.
Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:
454 g/q = 1 pound/q
Therefore,
64500 g/q = 64500 g/q × 1 p/q / 454 g/p
64500 gram/quart = 142.07 pound/quart
Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.
Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:
2000 p/q = 1 ton/q
Therefore,
142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q
142.07 pound/quart = 0.071 ton/quart
Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.
Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:
1 ton/q = 1/1.06 ton/L
Therefore,
0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q
0.071 ton/quart = 0.067 ton/Litre
Therefore, 0.071 ton/quart is 0.067 ton/Litre.
From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.
Question 1: A new fat-burning pill for men is introduced. To test for effectiveness, 50 men are given the pill and 50 men are given a placebo. After 6 months, the men's body fat percentage is calculated. Identify the control group, the manipulated variable, and the responding variable. Explain how you can identify each.
Answer:
Explanation:
In the scenario that is being described the control group would be the 50 men that have been given the placebo because they are the ones that should not have any effects from the placebo and that is by design. The manipulated variable is the new fat-burning pill because it is the one that the scientists can change and modify to try and achieve the desired results. Lastly, the responding variable are the 50 men who are given the new fat-burning pill because they are the ones that will be responding to the effects of the pill and providing the data needed by the scientists.
