1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olga nikolaevna [1]
3 years ago
11

The North Star is the last star in the Ursa Minor constellation. True False

Chemistry
1 answer:
Alja [10]3 years ago
4 0
The answer is true. It is the last star.
You might be interested in
Jeffrey is making a model of tungsten for his chemistry class. He has foam balls for the protons, neutrons, and electrons. He ha
mrs_skeptik [129]

Atomic number (Z) of tungsten is 74

Mass number (A) of tungsten is 184

Now:

Atomic number of an element = Number of protons = Number of electrons

Mass number = Number of Protons + Number of neutrons

In the case of tungsten

Total Number of electrons = 74

Jeffrey has already added 21 electrons

Number of electrons needed = 74 - 21 = 53

Ans (D) 53 more electrons are needed to complete the neutral atom of tungsten.

8 0
2 years ago
How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate is combined with 15.0 g of hydrochloric aci
horsena [70]

Answer:

22.7 g of CaCl₂ are produced in the reaction

Explanation:

This is the reaction:

CaCO₃ +  2HCl  →  CaCl₂  + CO₂  +  H₂O

Now, let's determine the limiting reactant.

Let's divide the mass between the molar mass, to find out moles of each reactant.

29 g / 100.08 g/m = 0.289 of carbonate

15 g / 36.45 g/m = 0.411 of acid

1 mol of carbonate must react with 2 moles of acid

0.289 moles of carbonate will react with the double of moles (0.578)

I only have 0.411 of HCl, so the acid is the limiting reactant.

Ratio is 2:1, so I will produce the half of moles, of salt.

0.411 / 2 = 0.205 moles of CaCl₂

Mol . molar mass = mass → 0.205 m . 110.98 g/m = 22.7 g

5 0
3 years ago
Electrons determine the of an atom
g100num [7]

Answer:

if u know the number of electrons u also know the number of protons present in the atom.

7 0
2 years ago
Hi! Which of the following decreases kinetic energy of solvent molecules? ( I need this handed in quickly!)
Black_prince [1.1K]

Answer:

c

Explanation:

4 0
3 years ago
Which mixture is most likely to form a suspension?flour and liquid water, as in gravy metal coins and liquid water sodium chlori
azamat
<span>The mixture that is most likely to form a suspension is flour and liquid water mixed together, as in a mixture like gravy. A suspension mixture is a mixture that has large solid particles, particles that are large enough for sedimentation.</span>
4 0
3 years ago
Other questions:
  • What represents the different forms of electromagnetic radiation
    6·1 answer
  • What is one way to test whether an unknown solution is acidic or basic
    12·1 answer
  • A 5.00 l sample of a gas exerts a pressure of 1040 torr at 50.0°c. In what volume would the same sample exert a pressure of 1.00
    15·1 answer
  • Which of the following statements is true?
    8·2 answers
  • For which of the following will the entropy of the system increase?
    7·1 answer
  • How do S waves move through the earth?
    10·1 answer
  • Explain the difference between a front and an air mass.
    7·1 answer
  • La Pokebola del gráfico realiza un MCU con una rapidez angular de 2π 9 rad s ⁄ . Determine el tiempo que emplea para ir desde A
    5·1 answer
  • Hola!
    13·1 answer
  • What is taxonomy?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!