Answers
Answer:
D
Explanation:
Related Questions
Jamal is 8 miles away from his house. He rides his bike home toward home at a speed of 12 mph..
How far away from home is he after a half hour?
Answers
Answer: 2miles
Explanation:if he’s going 12 miles in one hour, in half an hour he would’ve made it 6 miles. 8-6=2
Answer: b. 2 miles
Explanation:
what is an atoms nucleus made of
Answers
Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
5. The prefox Semi-Deans Capardy SC Based on your knowledge of the properties of elements, which kind of elements is most likely to make semiconductors?
Answers
is this correct? say something if it's wrong lol
Answers
Answer:
seFG9zuh98gufhIUAFIyhA*UGH8gguuguuuuuuuu
Explanation:
Answer:
Yes that look about right to me :)
The overall reaction in a commercial heat pack can be represented as How much heat is released when 4.40 moles of iron are reacted with excess ? Heat = kJ How much heat is released when 1.00 mole of is produced? Heat = kJ How much heat is released when 1.60 g iron is reacted with excess ? Heat = kJ How much heat is released when 11.8 g and 1.20 g are reacted? Heat = kJ
Answers
Answer:
Explanation:
The overall equation for this reaction can be represented as:[tex]4 Fe(s) + 3 O_{2(g) } \to 2Fe_2O_{3(s)} \ \ \ \ \Delta H = -1652 \ kJ[/tex]
The first question says:
How much heat is released when 4.40 moles of iron is reacted with excess O₂?
Suppose 1652 kJ of heat is being emitted into the surroundings when four(4) moles of Fe reacted with O₂, therefore;
4.40 moles of Fe reacts with:
[tex]=\dfrac{4.40 \ moles \times 1652 \ kJ}{4 \ moles}[/tex]
= 1817.2 kJ of heat will be produced.
The second question says:
How much heat is released when 1.00 mole of [tex]Fe_2O_3[/tex] is produced?
Given that 1652 kJ of heat is being emitted into the surroundings when two(2) moles of [tex]Fe_2O_3[/tex] is produced, therefore;
1.00 moles of [tex]Fe_2O_3[/tex] reacts with:
[tex]=\dfrac{1.00 \ moles \times 1652 \ kJ}{2 \ moles}[/tex]
= 826 kJ of heat will be produced.
To the third question; we have:
How much heat is released when 1.60 g iron is reacted with excess O₂?
We need to find the number of moles of iron first.
We know that number of moles = mass/molar mass
Thus, the molar mass of iron = 55.8 g/mol
number of moles of iron = (1.60g) / (55.8 g/mol)
number of moles of iron = 0.02867 mol
Thus; [tex]\dfrac{0.02867\ mol \times 1652 \ kJ }{4 \ mol}[/tex]
= 11.84 kJ of heat is released.
The last question says:
How much heat is released when 11.8 g Fe and 1.20 g O₂ are reacted?
Again;
the number of moles of Fe = (11.8g) / (55.8 g/mol) = 0.2114 mole of Fe
Thus; [tex]\dfrac{0.2114\ mol \times 1652 \ kJ }{4 \ mol}[/tex]
= 87.31 kJ of heat is released.
On the other hand,
the number of moles of O₂ = (1.20g) / (32 g/mol) = 0.0375 mol of O₂
Thus; [tex]\dfrac{0.0375\ mol \times 1652 \ kJ }{3 \ mol}[/tex]
= 20.65 kJ of heat is released
Therefore, when these two(2) reactants reacted with each other, it is just the smaller amount of heat that would be released because oxygen tends to be the limiting reactant.
Plz Help!
Make a funny sentence for flammability and compounds for Magnesium
Answers
what type of reaction is
CuO + H2SO4 ➡️ CuSO4 + H2O
Answers
3. A substance which is made up of two are more different
elements chemically combined is known as
A. an atom
B. a substance
C. a compound
D. a molecule
Answers
Answer:
Im pretty sure it c
Explanation:
C. A Compound
When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although
several elements seemed out of order, later discoveries showed the order to be correct.
Which event most likely helped the development of the periodic table?
O Scientists changed the atomic masses to better fit the pattern.
O Scientists refused to consider other ways to organize the elements.
O New technology was developed that modified the masses.
O New information changed the understanding of the atom's structure.
ANSWER ASAP
Answers
Elements in columns with the same number of valence electrons are in the same___
Answers
Answer:
group
Explanation:
The periodic table also has a special name for its vertical columns. Each column is called a group. The elements in each group have the same number of electrons in the outer orbital.
Calculate the density of an object with mass = 30.50 g and a volume = 2.20 cm^3
Answers
Answer:
The answer is 13.86 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 30.5 g
volume = 2.2 cm³
We have
[tex]density = \frac{30.5}{2.2} \\ = 13.863...[/tex]
We have the final answer as
13.86 g/cm³Hope this helps you
Imagine our class has discovered a new element and named it Berkmarium. Berkmarium is known to have 3 naturally occurring isotopes. In nature, 70% of the element is Berkmarium-95, 28% is Berkmarium-97, and 2% is Berkmarium-94. Which isotope will the average atomic mass of Berkmarum be closest to, and why? Support your answer with a calculation.
Answers
Answer:
Detail is given below.
Explanation:
Given data;
Abundance of Berkmarium-95 = 70%
Abundance of Berkmarium-97 = 28%
Abundance of Berkmarium-94 = 2%
Average atomic mass closer to which isotope = ?
Solution:
1st of all we will calculate the average atomic mass of Berkmarium.
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass = (70×95)+(28×97)+(2×94) /100
Average atomic mass = 6650 + 2716+ 188 / 100
Average atomic mass= 9554 / 100
Average atomic mass = 95.54 amu
The average atomic mass is closer to the isotope Berkmarium-95 because it is present in abundance as compared to the other two isotope. So this isotope constitute most of the part of Berkmarium.
What is the relationship between the number of each atom used to form compound and oxidation number?
Answers
Answer:Explanation:
In compounds, all other atoms are assigned an oxidation number so that the sum of the oxidation numbers on all the atoms in the species equals the charge on the species.
When gold is hammered it "squishes". Iron Pyrite is
known as "Fool's Gold". It is not..........
like gold,
but shatter into many pieces when struck by a
hammer, Iron Pyrite is..........
Answers
Explanation:
When gold is hammered it "squishes". Iron Pyrite is
known as "Fool's Gold". It is not..........
like gold,
but shatter into many pieces when struck by a
hammer, Iron Pyrite is..........
Single energy transformation
Answers
answer:
a change from one form of energy to another
explanation:
all living things need energy to survive The most common source of energy is organisms is glucose molecules which are used as food a plant food is no exception where do plants get the carbon needed to make glucose molecules during the process of photosynthesis.
A. From the ground
B. From the air
C. From the water
D. From the sun
Answers
Answer:
the answer is air
Explanation:
Answer:
B. From the air
Explanation:
Soil is an important resource. The erosion of soil is a problem worldwide. Which human activity MOST directly increases soil erosion?
Group of answer choices
Answers
Answer:
Farming/agriculture
Hope this helps and have a great day :)
And please mark me brainliest if you can :)
All the elements in the universe heavier than Helium are/were created _______.
a.
during the Big Bang
b.
by stars
c.
by chemical reactions
d.
from Lithium
Answers
Answer:
B. by stars
Hopes this helps
Explanation:
Use the following chemical equation to answer the question:
2 N2 + 3 H2 ⟶ 2 NH3
How many atoms of N (nitrogen) are present in the products?
1. 2
2. 3
3. 6
4. 9
Answers
2 atome nitrogen , 1 is correct
Mark all correct answers. Which of the following statements correctly describes plasmas
Answers
ANSWER Plasamas are good conductors of electricity and are affected bt magnetic fields
A 40 g sample of sucrose contains 16.8 g of carbon. what is the mass
percentage of carbon in sucrose?
Answers
Answer:
Thus 100.00 g of sucrose contains 42.11 g of carbon, 6.48 g of hydrogen, and 51.41 g of oxygen; to two decimal places, the percent composition of sucrose is indeed 42.11% carbon, 6.48% hydrogen, and 51.41% oxygen.
Explanation:
Hope this helps, leave a heart ❤️
Question 3 (3 points)
(03.04LO)
Match the formula to the correct name. (3 points)
Column A
Column B
1.
Cas
a. Calcium sulfide
2.
CaSO4
b. Calcium sulfate
3.
CaSO3
C. Calcium sulfite
Answers
Answer:
Column A [tex]{}[/tex] Column B
1. CaS [tex]{}[/tex] Calcium Sulfide
2. CaSO₄ [tex]{}[/tex] Calcium sulfate
3. CaSO₃ [tex]{}[/tex] Calcium sulfite
Explanation:
1) Calcium sulfide is a compound formed between calcium, Ca, and sulfur, S, with a chemical formula of CaS. It forms cubic crystals similar to rock salt, and smells like rotten eggs
2) Calcium sulfate is a chemical compound consisting of calcium, Ca, and sulfate SO₄. It is found in nature in the hydrated form as the mineral gypsum
3)Calcium sulfite is a chemical compound formed between calcium, Ca and sulfite, SO₃ used to treat water and preserve food.
Answer:
the formula for calcium sulfite is CaSO3
the formula for calcium sulfate is CaSO4
the formula for calcium sulfide is CaS
Explanation:
Hydrogen can be found in many things. It cannot be broken down to create something else. An example of something like hydrogen is oxygen. We call things like hydrogen or oxygen _ .
Answers
Answer:
matter im pretty sure sorry if its wrong
Explanation:
based on the property of conserving matter, matter can not be created or destroyed
6.82
A 2.10-mole sample of crystalline acetic acid, ini-
tially at 17.0°C, is allowed to melt at 17.0°C and is
then heated to 118.1°C (its normal boiling point) at
1.00 atm. The sample is allowed to vaporize at.
118.1°C and is then rapidly quenched to 17.0°C, so
that it recrystallizes. Calculate AH° for the total pro-
cess as described.
Answers
Answer:
0 kj
Explanation:
melting/initial temperature = 17.0°c
boiling point = 118.1°C
pressure = 1.00 atm
2.10 mole sample of crystalline
attached below is the detailed solution required
Question 2 of 11
Which of these are part of a scientific way of gathering information?
A. Fairy tales
B. Religious beliefs
C. Investigations
D. Opinions
SUBMIT
Answers
Answer:
C
Explanation:
the rest arent scientific
Answer:
C. Investigations
Explanation:
Test approved
Calculate the density in grams per cubic centimeter of a material that has a mass of
720 milligrams and a volume of 10.0 cubic centimeters. =
Answers
Answer:
1.72 g/cm ^3
Explanation:
PLZ HELP ME!!!!!!!!!!!!!!!
Answers
Answer:Graduated Cylinder
Explanation:
You use the water displacement test to find the volume of irregular shaped objects.
Answer:
Graduated Cylinder
what does MA 2 means?
Answers
Answer:
Master-at-Arms Petty Officer 2nd Class. MA2. Machine Accountant Second Class (Naval Rating) Copyright 1988-2018 AcronymFinder.com, All rights reserved.
Explanation:
Turtles are cold blooded meaning to use the sun to keep warm Austin a hypothesis the hospital prefer swimming in warm water he places his turtle on a rock in the middle of the bathtub and measures how much time the turtle spends off the rock doing a five minute. He conducts experiment on the four conditions in the bathtub no water warm water cold water and room temperature water in this experiment which is a control group
Answers
Answer:
Explanation:
This question is a little indirect but what should be noted is that the control group of any experimental research is the group that is not subjected to any form of treatment and is the first group in which the other groups (experimental groups) are compared to.
The control group in the experiment described in the question is the group placed in the bathtub with no water
what can you infer about an ion that has a negative charge?
I NEED HELP FAST FOR MY TEST!!!
Answers
Answer:
It has more electrons than protons. It is an anion.
