Answer:
A
Explanation:
Answer:b
Explanation:
a sample of ammonia has a mass of 89.9g. how many molecules are in this sample?
Answer:3.90
Explanation:
The element in Group 14 Period 4 has how many neutrons and is it a metal, nonmetal, metalloid or noble gas.
Number of neutrons=41, and it is metalloid
Further explanationGroup 14⇒valence electron = 4(ns²np²)
Period 4⇒n=4
So electron configuration of the element :
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p² = 32 electron=atomic number
The element with atomic number 32, which is in period 4 and group 14 is Ge-Germanium
There are seven elements that can be classified as metalloids, namely boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and polonium (Po).
While the mass number: 73
So the number of neutrons = mass number-atomic number
[tex]\tt 73-32=41[/tex]
Barbara completed an assignment for extra credit in science class. She used a pH meter to find the pH of different substances.
After she finished measuring the pHs, she created a diagram that showed the substances arranged in order from the most acidic to the most basic.
If Barbara added lemon juice—pH 2.2—to her investigation, where should it appear in her diagram?
A.
between milk and water
B.
to the left of cola
C.
between soap and bleach
D.
between water and blood
Answer:
if ur here for the coffee one its between cola and acid rain
Explanation:
ur mom
Which of these is a compound?
potassium
salt water
carbon dioxide
salad
Answer:
I think it's potassium.
Explanation:
N/A.
Xenon-60 In order, what is the number of protons, electrons, and neutrons.
60,6,6
54,54,6
6,54,54
Answer:
I would say B?
54,54,6
Explanation:
How many moles of carbon atoms are present
in 5.4 moles of glucose?
Answer in units of mol.
Answer:
32.4 mol
Explanation:
Given data:
Number of moles of C atom present = ?
Number of moles of glucose = 5.4 mol
Solution:
Glucose formula = C₆H₁₂O₆
There are 6 moles of C atoms are present in one mole of glucose.
In 5.4 moles of glucose:
5.4 mol × 6 = 32.4 mol
A 48.9 g piece of aluminum is dropped in a graduated cylinder partially filled with water. The original volume of water in the cylinder was 41.8 mL. The water rose to 54.4 mL when the aluminum was dropped in. What is the density of the aluminum?
Answer:
3.88g/mL
Explanation:
Density could be understood as the mass of a compound when it occupies 1mL.
To find the mass in 1mL we need to determine the volume that the piece occupies:
Based on Archimedes' principle, the volume of water displaced is equal to volume of the aluminium piece, that is:
54.4mL - 41.8mL = 12.6mL
As the piece has as mass 48.9g, the density is:
48.9g / 12.6mL =
3.88g/mLWhat is the formula for calculating time
Answer:
A
Explanation:
bc its right
This woman is riding a bicycle down a hill at a constant speed and in a straight line. Which change will increase the speed of the bicycle?
A. An added force of 20 N down the hill
B. Added forces of 30 N up the hill and 30 N down the hill
C. Added forces of 30 N up the hill and 20 N down the hill
D. An added force of 20 N to the side of the hill
Answer:
The answer is A. An added force of 20 N to the side of the hill
Explanation:
Answer:Its A. An added force of 20 N down the hill, Not D. An added force of 20 N to the side of the hill. The first person meant A and meant to add force of 20 N down the hill.
Explanation:
When the equation
Cu + AgNO3 → Cu(NO3)2 + Ag
is balanced, the coefficient of copper (II) nitrate is
A. 0.
B. 3.
C. 1
An equation which follow the law of conservation of mass is called the balanced equation. The coefficient of copper (II) nitrate is 1 .The correct option is C.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation.
The coefficients are the numbers which are used to balance the chemical equation. They are added in front of the formulas. According to law of conservation of matter, mass can neither be formed nor be destroyed.
The balanced equation for the given reaction is:
Cu (s) + 2AgNO₃ (aq) → Cu (NO₃)₂ (aq) + 2Ag (s)
Here the coefficient of Cu (NO₃)₂ is 1. The number of 'Cu', 'Ag', 'N' and 'O' atoms are equal. So the given equation is balanced. The coefficient of AgNO₃ is 2, and 'Ag' is 2.
Thus the correct option is C.
To know more about balanced equation, visit;
https://brainly.com/question/29769009
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what happens to the radius of the atoms of an element as you go towards the right in a row of the periodic table ?
Answer:
It decreases
Explanation:
As one moves from left to right on the periodic table, the radius of atoms reduces due to the nuclear pull.
The size of an atom estimated by the atomic radius is taken as half of the internuclear distance between the two covalently bonded atoms of non-metallic elements. Across a period, atomic radius decreases progressively from left to right. This is due to the increasing nuclear charge without attendant increase in the number of electronic shell. How do plants take in oxygen?
Through photosynthesis
Through the stomata
By eating food
By sleeping
Through stomata....
hope it's helpful :)
What happens when the two negative ions are brought close together?
They attract each other to form ionic networks.
A ring made of pure gold contains 5.29 x 1022 atoms. How many moles are in the ring?
Answer:
0.088 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.29 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.087873...[/tex]
We have the final answer as
0.088 molesHope this helps you
When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. A chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. What is the reason behind this increase in mass?
Answer:
magnesium oxide is greater than the mass of the magnesium.
Help!! In desperate need of help!!??
Answer:
MgO
Explanation:
6. This is the most commonly abused illegal drug in the United States
(5 Points)
Nicotine
Marijuana
Alcohol
Opioids
difference between calcium sulfide and calcium sulfate.
Answer: Calcium sulfide is a chemical compound having formula CaS. While Calcium sulfide is inorganic compound g fomlaCaSO4.
Explanation:
calcium sulfide is use in preparation of hydrogen sulfide, luminous pain and as a depilatory in cosmetics while calcium sulfate is used as desiccant. calcium sulfides is white material crystallizes in cubes like rock salt while calcium sulfate has three different crystalized forms known as hemihydrate (CaSO4⋅12H2O) , anhydrate (CaSO4) and as gypsum (CaSO4⋅2H2O). hope this explanation will be helpful for you
Will give brainliest
is drawing on paper a chemical or physical change
Answer:5
Explanation:
Answer:
physical change
Explanation:
Which statement describes an advantage of asexual reproduction?
O Asexual reproduction results in variations in DNA.
o Asexual reproduction causes less competition for resources.
o Asexual reproduction is faster tha sexual reproduction.
O Asexual reproduction requires more energy than sexual reproduction.
Activity
Asexual reproduction is faster tha sexual reproduction.
In asexual reproduction there is mitosis. There is prophase, metaphase, anaphase, and telphase. In sexual reproduction there is meiosis. Meiosis does have prophase, metaphase, anaphase, and telophase. But it has two stages of that. So it also has prophase 2, metaphase 2, anaphase 2, and telophase 2,
Explanation:
What is the mass of 2.3 moles of SnF4?
447.81830943999995. that's the mass
Is this equation completely balanced?
2C8H8 + 25O2 = 8CO2 + 18H2O
A. No, because the number of carbon, hydrogen & oxygen atoms on both sides of the equation are not equal.
B. No, because the number of oxygen atoms on both sides of the equation are not equal.
C. Yes, because all of the coefficients are in their lowest whole number ratio.
D. No, because the number of hydrogen atoms on both sides of the equation are not equal.
E. Yes, because the number of products is equal to the number of reactants.
Which is classified as nonpolar covalent?
1) hydrogen and iodine
2) carbon and sulfur
3) hydrogen and chlorine
4) nitrogen and hydrogen
Answer:
3 i think...............
Answer:
3
Explanation:
what happens to the radius of the atoms of an element as you go down a column of the periodic table ?
Answer:
Increases
Explanation:
The atomic radius increases as you go down a periodic table. Across a period which is a row, the atomic radius reduces.
The atomic radius is taken as the half of the inter-nuclear distance between two covalently boned atoms of non-metallic elements. It is also, half of the distance between two nuclei in the solid state. Across a period in the periodic table, atomic radii decreases progressively from left to right. Down a group it increases from up down.Which of these is an example of a homogeneous mixture
A- Distilled water
B- A bar of pure gold
C- A solution of salt water
D- Carbon dioxide
Answer:
C- A solution of salt water
Explanation:
You cannot see the salt within the water, for it has already dissolved. The contents are uniformly distributed throughout the water's volume.
I hope this made sense! (^-^)
Which of the following best describes a vacuum
Answer:
it sucks up stuff,cleans around the house,and can be emptied
Explanation:
because its what it is spose to do
Answer:
a space entirely devoid of matter.
Explanation:
You walk 75 meters in 5 hours. What is your speed?
A.10 m/hr
B.5 m/hr
C.15 m/hr
D.12 m/hr
HELP!
What needs to happen for a chemical change to happen?
What is meaning of metabolism
Answer:
Metabolism is a combination of biochemical processes that your body uses to convert food into energy. These metabolic processes include breathing, eating and digesting food, the delivery of nutrients to your cells through the blood, the use of energy by your muscles, nerves, and cells, and finally the elimination of waste products from your body.
Hope this Helps!
Metabolism is the chemical processes that occur within a living organism in order to maintain life.
Hopes this helps luv! ο(=•ω＜=)ρ⌒☆
