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saw5 [17]
3 years ago
7

A scientist notices that a lump of niobium is warm to the touch and wonders if nuclear reactions are taking place in the metal.

How can she find out?
Measure the metal’s temperature.
Check for the presence of alpha, beta, and gamma particles.
Look for the presence of niobium compounds.
Place the niobium in a pressurized container, and see if the lump becomes warmer.
Chemistry
2 answers:
sertanlavr [38]3 years ago
5 0

Answer is: Check for the presence of alpha, beta, and gamma particles.

1) Alpha particle is nucleus of a helium-4 atom, which is made of two protons and two neutrons.

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

2) Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.

There are two types of beta decay: beta minus and beta plus.

3) During gamma emission the nucleus emits radiation without changing its composition.

Mnenie [13.5K]3 years ago
4 0

Answer:

The answer is B.

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Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 2.7 g of ethane is m
Bond [772]

Answer:

m_{H_2O}=4.86gH_2O

Explanation:

Hello,

In this case, the described chemical reaction is:

C_2H_6+\frac{7}{2} O_2\rightarrow 2CO_2+3H_2O

Thus, for the given reacting masses, we must identify the limiting reactant for us to determine the maximum mass of water that could be produced, therefore, we proceed to compute the available moles of ethane:

n_{C_2H_6}=2.7gC_2H_6*\frac{1molC_2H_6}{30gC_2H_6} =0.09molC_2H_6

Next, we compute the moles of ethane consumed by 13.0 grams of oxygen by using the 1:7/2 molar ratio between them:

n_{C_2H_6}^{consumed\ by \ O_2}=13.0gO_2*\frac{1molO_2}{32gO_2}*\frac{1molC_2H_6}{\frac{7}{2} molO_2}=0.116molC_2H_6

Thus, we notice there are less available moles of ethane, for that reason, it is the limiting reactant, thereby, the maximum amount of water is computed by considering the 1:3 molar ratio between ethane and water:

m_{H_2O}=0.09molC_2H_6*\frac{3molH_2O}{1molC_2H_6} *\frac{18gH_2O}{1molH_2O} \\\\m_{H_2O}=4.86gH_2O

Best regards.

3 0
3 years ago
Balance this equation and pick the answer with the coefficients that belong there.
geniusboy [140]

Answer:

2,3,6,1

2,3,6,1

Explanation:

The unbalanced reaction expression is given as:

  AlBr₃    +    K₂SO₄  →    KBr  + Al₂(SO₄)₃

We need to balanced this reaction equation. Our approach is a mathematical method where we assign variable a,b,c and d as the coefficients.

 aAlBr₃    +    bK₂SO₄  →    cKBr  + dAl₂(SO₄)₃

Conserving Al;  a  = 2d

                   Br:  3a  = c

                   K:   2b = c

                   S:   b  = 3d

                   O:  4b  = 12d

Let a  = 1, c = 3, d  = \frac{1}{2}  b  = \frac{3}{2}  

 Multiply through by 2 to give;

     a  = 2, b = 3, c = 6 and d  = 1

 2AlBr₃    +    3K₂SO₄  →    6KBr  + Al₂(SO₄)₃

6 0
3 years ago
Which of the following laws is NOT explained by Dalton's atomic theory? A.the law of conservation of mass B. the periodic law C.
zysi [14]

B. the periodic law

Explanation:

The periodic law was not explained by the Dalton's atomic theory.

The periodic law was first postulated by Dimitry Mendeleef and Lothar Meyer around 1869 where they independently arrived at the periodic table or chart.

  • The table was based on the periodic law which states that "chemical properties of elements are a periodic function of their atomic weights".
  • The modern periodic law was restated by Henry Moseley in the early 1900s. He changed the basis of the law to atomic number.
  • The present periodic law is stated as "the properties of elements are a periodic function of their atomic number".

The laws of conservation of mass, multiple proportions and definite proportions are all explained by the Dalton's atomic theory.

learn more:

Dalton's model of the atom brainly.com/question/1979129

#learnwithBrainly

7 0
3 years ago
Is know as a force that pulls an object weight to center of the earth
vlabodo [156]

That force would be gravity.  Gravity is what pulls any object down towards Earth due to the large mass of the Earth.

4 0
3 years ago
Read 2 more answers
The direction of movement of the cold front shown in the figure at left is _____.
Mice21 [21]

Answer:

northwest

Explanation:

Cmon man adleast try before you ask it on brainly or else you will never get any smarter

7 0
3 years ago
Read 2 more answers
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