Answer:
12 hydrogen atoms
Explanation:
Let's consider the chemical formula of the compound (NH₄)₂C₈H₄O₂.
We can see the ammonium ion, NH₄⁺, which contains 4 hydrogen atoms. However, this ion is enclosed in parenthesis with a subindex 2. That means that we have to multiply the whole ion by 2, therefore resulting in 8 atoms of hydrogen. Then, in C₈H₄O₂, we can see another 4 hydrogen atoms. The total number of hydrogen atoms in 1 molecule of (NH₄)₂C₈H₄O₂ is 8 + 4 = 12 hydrogen atoms.
What are 4 ways you can improve your skeletal system health?
Answer:
1. get vitamin c
2. get your bone mineral density tested
3. don't smoke or drink excessively
4. start weight-bearing exercise
Explanation:
helps improve skeletal system
What is the mass number for an atom of zinc containing 30 protons and 34 neutrons?
Answer:
64
Explanation:
mass number =proton + neutron
=30+34=64
What is the source of thermal energy for Earth's mantle?
A Earth's core
B. global warming
C. mantle downwelling
D. radiation from the sun
Answer:
D. Radiation from the sun
Explanation:
The main source of thermal energy for the earth is Sun. The sun is major source which provide heat energy and light energy to the earth. The sun converts almost 4 million tons of energy into electromagnetic radiations which is a source of thermal energy for Earth's Mantle.
What are the products of the acid-base reaction of sodium carbonate with acetic acid?
Answer:
The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution. The reaction is: Sodium bicarbonate and acetic acid reacts to carbon dioxide, water and sodium acetate.
Explanation:
hope this helps
A chemist dissolves of pure potassium hydroxide in enough water to make up of solution. Calculate the pH of the solution. (The temperature of the solution is .) Be sure your answer has the correct number of significant digits.
Answer:
12.99
Explanation:
A chemist dissolves 716. mg of pure potassium hydroxide in enough water to make up 130. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits.
Step 1: Given data
Mass of KOH: 716. mg (0.716 g)Volume of the solution: 130. mL (0.130 L)Step 2: Calculate the moles corresponding to 0.716 g of KOH
The molar mass of KOH is 56.11 g/mol.
0.716 g × 1 mol/56.11 g = 0.0128 mol
Step 3: Calculate the molar concentration of KOH
[KOH] = 0.0128 mol/0.130 L = 0.0985 M
Step 4: Write the ionization reaction of KOH
KOH(aq) ⇒ K⁺(aq) + OH⁻(aq)
The molar ratio of KOH to OH⁻is 1:1. Then, [OH⁻] = 0.0985 M
Step 5: Calculate the pOH
We will use the following expression.
pOH = -log [OH⁻] = -log 0.0985 = 1.01
Step 6: Calculate the pH
We will use the following expression.
pH + pOH = 14
pH = 14 - pOH = 14 -1.01 = 12.99
Why does solid water (ice) float when placed in liquid water? *
Ice does not float in liquid water.
Ice is less dense than liquid water.
Ice is more dense than liquid water.
The densities of liquid water and ice are the same .
Answer:
Ice is less dense than water.
Which describes a difference between cephalopods and gastropods?
Cephalopods have a water vascular system, and gastropods have an open circulatory system.
Cephalopods live only in ocean environments, and gastropods live in a variety of environments.
Cephalopods have a simple nervous system, and gastropods have a complex nervous system.
Cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks. CAN SOMEONE PLZZZZ ANWER THIS I WILL GIVE U 15 PIONTS
Answer:
B
Explanation:
I took the test
Answer:
The correct answer is B
Explanation:
Question 3 (1 point)
Consider the following unbalanced chemical equation representing the combustion of methane, yielding carbon dioxide and water.
CH4 + O2 --> CO2 + H20
If you had burned 800 g of methane, how many moles of Carbon dioxide would be produced?
A)122.22
B)8
C)2200
D)100
E)670
F)750
G)50
Answer:
Im pretty sure its B
Explanation:
Answer:
G) 50 mol
Explanation:
Given data:
Mass of methane = 800 g
Number of moles of CO₂ produced = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of methane:
Number of moles = mass/molar mass
Number of moles = 800 g/ 16 g/mol
Number of moles = 50 mol
Now we will compare the moles of methane and carbon dioxide.
CH₄ : CO₂
1 : 1
50 : 50
Which element easily gains one electron to form a negative ion?
Flourine
Magnesium
Nitrogen
Lithium
Answer: Fluorine
Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.
Answer:
Fluorine.
Explanation:
I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.